Diaphragm structure and battery

Abstract

The utility model provides a diaphragm structure and a battery, and relates to the technical field of batteries, the diaphragm structure comprises a diaphragm body, a first groove is formed in at least one side of the diaphragm body along the thickness direction of the diaphragm body, and the first groove is formed by recessing the surface of one side of the diaphragm body towards the surface of the other side of the diaphragm body along the thickness direction of the diaphragm body; the projection of the first groove on the surface of the diaphragm body at least covers the surface center of the diaphragm body. Furthermore, the diaphragm body can store more electrolyte through the first groove positioned in the central area, so that the diaphragm body has more electrolyte retention capacity in the central area, the wettability of the middle area of the pole piece is improved, the phenomena of lithium precipitation, black spots and the like in the middle area of the pole piece in the circulating process are avoided, and the service life of the pole piece is prolonged. And the excellent cycle performance of the battery is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery technical field especially is related to a diaphragm structure and battery. BACKGROUND

[0002] With the application market of lithium ion battery more and more open, the size requirement of battery is more and more thin, and energy density is gradually required to improve. In the related art, the problem of improving energy density can be solved by increasing the compaction density of the positive and negative pole pieces, but it also introduces new problems, such as the problem of difficult infiltration of the pole piece during the battery cycle, especially the problem of lithium precipitation and black spots in the middle region of the pole piece during the cycle, which reduces the cycle life and safety of the battery. SUMMARY

[0003] The purpose of the present application is to provide a diaphragm structure and battery to solve the technical problem of reducing the cycle life of the battery in the prior art.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is:

[0005] In one or more embodiments of the present application, the first groove is provided on at least one side of the diaphragm body along the thickness direction thereof.

[0006] In one or more embodiments of the present application, the first groove is provided on at least one side of the diaphragm body facing the anode.

[0007] In one or more embodiments of the present application, at least one second groove is provided on at least one side of the diaphragm body along the thickness direction thereof, and the second groove is provided around the first groove, wherein the first groove and the second groove or the adjacent two second grooves are provided with an interval.

[0008] In one or more embodiments of the present application, the second groove is a ring structure around the first groove, and the second groove is a continuous ring structure or a discontinuous ring structure, and all the second grooves are arranged outwardly around the center of the first groove.

[0009] In one or more embodiments of the present application, the first groove is a triangle, a circle, an ellipse or a polygon, and / or,

[0010] The second groove is a triangular ring, a circular ring, an elliptical ring or a polygonal ring, and when the second groove is a discontinuous ring structure, the second grooves located on the same ring include a plurality of third grooves, and the adjacent two third grooves located on the same ring are provided with an interval.

[0011] In one or more embodiments of the present application, the cross-sectional area of at least part of the area of the first groove recessed in the thickness direction is greater than the area at the groove opening of the first groove;

[0012] And / or, the cross-sectional area of at least part of the area of the second groove recessed in the thickness direction is greater than the area at the groove opening thereof.

[0013] In one or more embodiments of the present application, the area at the groove opening of the second groove on each ring is successively reduced from the first groove, and / or,

[0014] The maximum groove depth of the second groove on each ring in the thickness direction is successively reduced from the first groove.

[0015] In one or more embodiments of the present application, the area at the groove opening of the first groove accounts for 35% to 50% of the surface area of the separator body, and the area at the groove opening of the second groove on each ring is 30% to 50% of the area at the groove opening of the first groove adjacent thereto or the area at the groove opening of the second groove adjacent thereto and closer to the first groove.

[0016] In one or more embodiments of the present application, the maximum groove depth of the first groove is 1 to 1.5 μm, and the maximum groove depth of the second groove on each ring is 0.1 to 0.15 μm less than the maximum groove depth of the first groove adjacent thereto or the second groove adjacent thereto and closer to the first groove.

[0017] In a second aspect, the present application also provides a battery comprising an anode pole piece, a cathode pole piece, an electrolyte, and the separator structure of any one of the first aspect, the separator structure being arranged between the anode pole piece and the cathode pole piece.

[0018] Based on the above technical solution, the separator structure and the battery provided by the present application at least have the following beneficial technical effects:

[0019] The separator structure provided by the embodiments of the present application comprises a separator body, a first groove is formed on at least one side of the separator body in the thickness direction of the separator body, the first groove is recessed from one side surface of the separator body to the other side surface in the thickness direction of the separator body, and the projection of the first groove on the surface of the separator body covers at least the center of the surface of the separator body. Further, the separator body can store more electrolyte through the first groove in the center area, so that the separator body has more liquid retention in the center area, thereby improving the wettability of the middle area of the pole piece, avoiding the phenomena such as lithium precipitation and black spots in the middle area of the pole piece during the cycle process, and ensuring excellent cycle performance of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

[0021] Figure 1 is a schematic diagram of a diaphragm structure according to an embodiment provided by the present application.

[0022] Figure 2 is a schematic diagram of a diaphragm structure according to another embodiment provided by the present application.

[0023] Figure 3 is a schematic diagram of a diaphragm structure according to yet another embodiment provided by the present application.

[0024] Figure 4 is a schematic diagram of a diaphragm structure according to yet another embodiment provided by the present application.

[0025] Figure 5 is a longitudinal sectional view of a diaphragm structure according to an embodiment provided by the present application.

[0026] Figure 6 is a longitudinal sectional view of a first groove in a diaphragm structure according to an embodiment provided by the present application.

[0027] In the figure: 1 - diaphragm body; 11 - first groove; 12 - second groove; 13 - third groove. DETAILED DESCRIPTION

[0028] In order to make the technical problems to be solved by the present application, technical solutions and beneficial effects more clearly understood, the following will further describe the present application in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0029] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0030] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0031] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can 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 specifically limited.

[0032] In the related art, in order to improve the energy density of the battery, the compaction density of the positive and negative electrode sheets is generally increased to solve the problem, but the increase of the compaction density of the positive and negative electrode sheets will cause the problem that the electrode sheet is difficult to soak during the battery cycle, especially the middle region of the electrode sheet will appear lithium precipitation and black spot during the cycle, which will reduce the cycle life and safety of the battery.

[0033] Based on the above considerations, in order to solve the technical problem of reducing the cycle life of the battery in the prior art, the present application provides a separator structure, comprising a separator body, a first groove is formed on at least one side of the separator body along the thickness direction of the separator body, the first groove is recessed from the surface of the separator body from one side to the other side along the thickness direction of the separator body, and the projection of the first groove on the surface of the separator body covers at least the center of the surface of the separator body.

[0034] In the technical scheme of the present application, the separator body can store more electrolyte through the first groove located in the center region, so that the separator body has more liquid retention in the center region, thereby improving the wettability of the middle region of the electrode sheet, avoiding the phenomenon of lithium precipitation and black spot in the middle region of the electrode sheet during the cycle, and ensuring excellent cycle performance of the battery.

[0035] The technical scheme of the present application will be described in detail below with reference to the drawings of the specification.

[0036] Please refer to Figures 1 to 4 The present application provides a separator structure, comprising: a separator body 1, a first groove 11 is formed on at least one side of the separator body 1 along the thickness direction of the separator body 1, the first groove 11 is recessed from the surface of the separator body 1 from one side to the other side along the thickness direction of the separator body 1, and the projection of the first groove 11 on the surface of the separator body 1 covers at least the center of the surface of the separator body 1.

[0037] The first groove 11 is arranged on one side of the diaphragm body 1 in the thickness direction, and can also be arranged on both sides of the diaphragm body 1 in the thickness direction. The first groove 11 is formed by recessing the surface of one side of the diaphragm body 1 toward the surface of the other side in the thickness direction. It can be understood that the first groove 11 is a groove structure formed by recessing the surface of one side of the diaphragm body 1 toward the surface of the other side, and the groove depth of the first groove 11 is less than the thickness of the diaphragm body 1. The projection of the first groove 11 on the surface of the diaphragm body 1 covers at least the center of the surface of the diaphragm body 1. It can be understood that the coverage area of the first groove 11 is the partial area extending outward from the center of the surface of the diaphragm body 1.

[0038] In the technical scheme of the embodiments of the present application, through the above arrangement, the diaphragm body 1 can store more electrolyte through the first groove 11 located in the center area, so that the diaphragm body 1 has more liquid retention in the center area, thereby improving the wettability of the middle area of the pole piece and avoiding the phenomena of lithium precipitation and black spots in the middle area of the pole piece during the cycle process, and ensuring the excellent cycle performance of the battery.

[0039] In some embodiments, the first groove 11 is arranged on at least one side of the diaphragm body 1 facing the anode.

[0040] Since the anode surface of the pole piece is more prone to lithium precipitation and black spots during the cycle process, arranging the first groove 11 on the side of the diaphragm body 1 facing the anode can solve the problems of lithium precipitation and black spots on the anode surface of the pole piece. In some embodiments, the first groove 11 is arranged on both sides of the diaphragm body 1, which can better solve the problems of lithium precipitation and black spots during the cycle process of the pole piece and ensure the excellent cycle life of the battery during long cycle process.

[0041] In some embodiments, the maximum groove depth of the first groove 11 is 1-1.5 μm. If the groove depth of the first groove 11 is too small, it is not conducive to storing electrolyte and retaining liquid, which leads to a decrease in cycle life. If the groove depth of the first groove 11 is too deep, it will damage the diaphragm body and affect the mechanical properties of the diaphragm structure.

[0042] In some embodiments, the first groove 11 is triangular, circular, elliptical or polygonal. In other embodiments, the first groove 11 can also be an irregular shape.

[0043] Please refer to Figure 6 In some embodiments, the cross-sectional area of at least part of the area recessed in the thickness direction of the first groove 11 is greater than the area of the groove opening of the first groove 11. For example, as shown in Figure 6As shown, the cross-sectional area of the first groove 11 gradually increases and then gradually decreases from the opening of the first groove 11. In this way, the contact area between the electrolyte and the first groove 11 can be increased, the liquid retention capacity of the first groove 11 can be increased, and the transmission of Li + can be ensured, so that the lithium battery has low resistance.

[0044] Please refer to Figures 1 to 4 In some embodiments, at least one second groove 12 is arranged on at least one side of the separator body 1 along the thickness direction thereof, and the second groove 12 is arranged around the first groove 11, wherein the first groove 11 and the second groove 12 or two adjacent second grooves 12 are arranged at intervals.

[0045] The second groove 12 is a groove structure formed by recessing from one side surface of the separator body 1 to the other side surface.

[0046] In the technical scheme of the embodiments of the present application, by arranging at least one second groove 12 around the first groove 11, the separator body 1 can store more electrolyte at the first groove 11 and the second groove 12, increase the liquid retention capacity, further improve the wettability of the pole piece, avoid the problems of lithium precipitation and black spots of the pole piece in the cycle process, improve the cycle performance of the battery, and at the same time, ensure the transmission of Li + , so that the lithium battery has low resistance.

[0047] Please refer to Figure 1 and Figure 2 In some embodiments, the second groove 12 is an annular structure around the first groove 11, the second groove 12 is a continuous annular structure, and all the second grooves 12 are arranged in turn outward around the center of the first groove 11.

[0048] The second groove 12 can be a square annular structure as shown in Figure 1 , or an elliptical annular structure as shown in Figure 2 In other embodiments, the second groove 12 can be a triangular annular structure, a circular annular structure or other polygonal annular structure. The number of second grooves 12 can be one, two, three, etc.

[0049] Please refer to Figure 3 or Figure 4 In some embodiments, the second groove 12 can also be a non-continuous annular structure. When the second groove 12 is a non-continuous annular structure, the second grooves 12 located on the same ring include a plurality of third grooves 13, and two adjacent third grooves 13 located on the same ring are arranged at intervals.

[0050] The second groove 12 can be a square annular structure as shown in Figure 3 or an elliptical annular structure as shown in Figure 4The discontinuous square ring is shown. In other embodiments, the second groove 12 can also be a discontinuous triangular ring, a discontinuous circular ring, a discontinuous elliptical ring, or a discontinuous polygonal ring.

[0051] In the technical solutions of the embodiments of the present application, by setting the second groove 12 as a ring structure around the first groove 11, the diaphragm body 1 can store more electrolyte in the area outward from the center area, improve the wettability of the multiple areas of the pole piece, and improve the cycle performance of the battery, while ensuring that the Li + transmission has more media, so that the lithium battery has low resistance.

[0052] In some embodiments, the cross-sectional area of at least part of the area where the second groove 12 is recessed in the thickness direction is greater than the area at the opening of the second groove 12. The cross-sectional area of the second groove 12 can also gradually increase and then gradually decrease from the opening of the second groove 12. In this way, the contact area between the electrolyte and the second groove 12 can be increased, and the liquid retention capacity of the second groove 12 can be increased.

[0053] Please refer to Figure 5 In some embodiments, the area at the opening of the second groove 12 on each ring decreases outward from the first groove 11. In some embodiments, the maximum groove depth of the second groove 12 in the thickness direction on each ring decreases outward from the first groove 11.

[0054] It can be understood that the area at the opening of the second groove 12 and the maximum groove depth decrease outward from the first groove 11 until they disappear, so that more electrolyte is stored in the area close to the center of the diaphragm structure, solving the problem of lithium precipitation and black spots in the middle area of the pole piece during the cycle process, and improving the cycle performance of the battery.

[0055] In some embodiments, the area at the opening of the first groove 11 accounts for 35% to 50% of the surface area of the diaphragm body 1. If the area at the opening of the first groove 11 is too large, the mechanical properties of the diaphragm body will be affected due to too much recessed area. If the area is too small, it is not conducive to the first groove 11 to exert the best liquid retention capacity.

[0056] In some embodiments, the area at the opening of the second groove 12 on each ring is 30% to 50% of the area at the opening of the first groove 11 adjacent thereto or the area at the opening of the second groove 12 adjacent thereto and closer to the first groove 11.

[0057] It can be understood that the second groove 12 is a multi-ring around the first groove 11, and the area at the groove opening of each ring of the second groove 12 is reduced to 30%-50% of the area at the groove opening of the first groove 11 adjacent thereto or the area at the groove opening of the second groove 12 adjacent thereto and closer to the first groove 11, and then the area at the groove opening of the multi-ring second groove 12 is sequentially reduced outward from the first groove 11 until 0.

[0058] In the technical scheme of the embodiment of the present application, the above arrangement forms a gradient-decreasing groove structure on the diaphragm body, which ensures that more electrolyte can be stored in the middle region of the diaphragm body. If the decreasing area is too large, it is not conducive to forming a multi-gradient groove and is not conducive to the multi-gradient distribution of electrolyte; if the decreasing area is too small, it is not conducive to improving the electrolyte distribution change. As the second groove 12 area becomes smaller and smaller outward from the first groove 11, more electrolyte can be stored in the middle region. The problem of lithium precipitation and black spots in the middle region of the pole piece in the cycle process is solved, and the cycle performance of the battery is improved.

[0059] In some embodiments, the maximum groove depth of the first groove 11 is 1-1.5 μm, and the maximum groove depth of the second groove 12 on each ring is 0.1-0.15 μm smaller than the maximum groove depth of the first groove 11 adjacent thereto or the second groove 12 adjacent thereto and closer to the first groove 11. In order to facilitate the groove depth to be smaller and smaller as the second groove 12 is farther away from the first groove 11, so as to ensure that more electrolyte can be stored in the middle region.

[0060] On the other hand, the present application also provides a battery comprising an anode pole piece, a cathode pole piece, an electrolyte and the aforementioned diaphragm structure, the diaphragm structure being arranged between the anode pole piece and the cathode pole piece.

[0061] The battery of the present application can be an aluminum shell battery or a soft package battery.

[0062] The performance of the diaphragm structure of the present application will be described below in conjunction with specific embodiments.

[0063] Embodiment 1

[0064] In the diaphragm structure of the present embodiment as shown in Figure 1 The same structure is arranged on both sides of the diaphragm thickness direction, the first groove 11 is a quadrangular structure, and the second groove 12 is a quadrangular continuous ring structure around the first groove 11, so that the surface of the diaphragm structure forms a "reentrant concave shape", wherein the groove depth of the first groove 11 is 1.2 μm, and the area at the groove opening of the first groove 11 accounts for 45% of the surface area of the diaphragm body 1; the groove depth of the second groove 12 is sequentially reduced by 0.12 μm outward from the first groove 11, and the area at the groove opening of the second groove 12 is sequentially reduced to 35% of the area at the groove opening of the previous groove outward from the first groove 11.

[0065] After the preparation, the tensile performance of the separator is tested by a tensile tester at a speed of 250 mm / min.

[0066] The separator is wound or laminated with the anode and cathode electrode sheets to form an aluminum shell battery or a soft package battery, and the electrochemical performance is tested at a voltage window of 2.0-4.0V at 25℃±2.

[0067] Example 2

[0068] The difference between this embodiment and Example 1 is that:

[0069] The groove depth of the first groove 11 is 1 pm, and the area of the first groove 11 accounts for 50% of the surface area of the separator body 1. The groove depth of the second groove 12 decreases by 0.12 pm from the first groove 11 outward, and the area of the second groove 12 decreases to 35% of the previous groove outward.

[0070] After the preparation, the tensile performance of the separator is tested by a tensile tester at a speed of 250 mm / min. The separator is wound or laminated with the anode and cathode electrode sheets to form an aluminum shell battery or a soft package battery, and the electrochemical performance is tested at a voltage window of 2.0-4.0V at 25℃±2.

[0071] Example 3

[0072] The difference between this embodiment and Example 1 is that:

[0073] The groove depth of the first groove 11 is 1.5 pm, and the area of the first groove 11 accounts for 35% of the surface area of the separator body 1. The groove depth of the second groove 12 decreases by 0.12 pm from the first groove 11 outward, and the area of the second groove 12 decreases to 35% of the previous groove outward.

[0074] After the preparation, the tensile performance of the separator is tested by a tensile tester at a speed of 250 mm / min. The separator is wound or laminated with the anode and cathode electrode sheets to form an aluminum shell battery or a soft package battery, and the electrochemical performance is tested at a voltage window of 2.0-4.0V at 25℃±2.

[0075] Example 4

[0076] The difference between this embodiment and Example 1 is that:

[0077] The groove depth of the first groove 11 is 1.5 μm, and the area at the groove opening of the first groove 11 accounts for 50% of the surface area of the diaphragm body 1; the groove depth of the second groove 12 decreases by 0.12 μm from the first groove 11 outward in turn, and the area at the groove opening of the second groove 12 decreases to 35% of the previous groove outward in turn.

[0078] After the preparation is completed, the tensile properties of the diaphragm are tested by using a tensile testing machine at a speed of 250 mm / min. The diaphragm is wound with anode and cathode electrode sheets to form an aluminum shell battery or a soft package battery. The electrochemical performance is tested at a temperature of 25℃±2 and a voltage window of 2.0-4.0V.

[0079] Example 5

[0080] The difference between this embodiment and Example 1 is that:

[0081] Only the first groove 11 and the second groove 12 are arranged on the side of the diaphragm structure facing the anode electrode sheet, wherein the groove depth of the first groove 11 is 1.5 μm, and the area at the groove opening of the first groove 11 accounts for 35% of the surface area of the diaphragm body 1; the groove depth of the second groove 12 decreases by 0.12 μm from the first groove 11 outward in turn, and the area at the groove opening of the second groove 12 decreases to 35% of the previous groove outward in turn.

[0082] After the preparation is completed, the tensile properties of the diaphragm are tested by using a tensile testing machine at a speed of 250 mm / min. The diaphragm is wound with anode and cathode electrode sheets to form an aluminum shell battery or a soft package battery. The electrochemical performance is tested at a temperature of 25℃±2 and a voltage window of 2.0-4.0V.

[0083] Example 6

[0084] The difference between this embodiment and Example 1 is that:

[0085] In the diaphragm structure of this embodiment, as shown in Figure 3 , that is, the first groove 11 is a quadrilateral structure, and the second groove 12 includes a plurality of discontinuously arranged third grooves 13, and the others are the same as in Example 1.

[0086] Comparative Example 1

[0087] The difference between this comparative example 1 and Example 1 is that:

[0088] The diaphragm structure is a common PE or PP diaphragm, and no first groove 11 and second groove 12 are arranged.

[0089] Comparative Example 2

[0090] The difference between this comparative example 2 and Example 1 is that:

[0091] The first groove 11 and the second groove 12 are arranged on the side of the diaphragm structure facing the cathode tab.

[0092] Comparative Example 3

[0093] The difference between the present comparative example 3 and the example 1 is that:

[0094] The depth of the first groove 11 is 0.5 μm.

[0095] Comparative Example 4

[0096] The difference between the present comparative example 4 and the example 1 is that:

[0097] The depth of the first groove 11 is 2 μm.

[0098] The test results and electrochemical performance are shown in Table 1 below.

[0099] Table 1 Test results

[0100]

[0101]

[0102] As can be seen from the results in Table 1, the tensile strength of the diaphragm structure of the examples 1 to 6 of the present application can reach 1900 kgf / cm2, which is higher than that of the comparative example 1. 2 The DCR internal resistance at 50% SOC is smaller, and the SOH of the battery after 1000 cycles can still reach more than 86%. The tab is well infiltrated, without black spots and lithium precipitation, so the diaphragm structure of the present application can improve the infiltration in the middle of the tab, and ensure excellent cycle life and low resistance of the battery in the long cycle process.

[0103] The diaphragm of the comparative example 1 adopts a common diaphragm structure without the first groove 11 and the second groove 12 structure, which results in poor infiltration in the tab, black spots, lithium precipitation and large internal resistance of the battery, and reduces the cycle life of the battery. In the comparative example 2, the first groove 11 and the second groove 12 are arranged on the side facing the cathode tab, which results in poor infiltration of the anode tab, and black spots and lithium precipitation in the anode tab. The diaphragm structure of the comparative example 3 has a small depth of the first groove 11, which results in a small amount of electrolyte, although the tab has no black spots and lithium precipitation, but the cycle life is relatively reduced. The diaphragm structure of the comparative example 4 has a large depth of the first groove 11, which results in low tensile strength, affecting the mechanical properties of the diaphragm structure.

[0104] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A separator structure, characterized by, Comprising: A diaphragm body (1) having a first groove (11) formed on at least one side of the diaphragm body (1) along its thickness direction, the first groove (11) being concave from one side surface of the diaphragm body (1) to the other side surface along its thickness direction, and the projection of the first groove (11) on the surface of the diaphragm body (1) covering at least the center of the surface of the diaphragm body (1).

2. The separator structure according to claim 1, characterized by The first groove (11) is provided on at least one side of the diaphragm body (1) facing the anode.

3. The separator structure according to claim 1 or 2, characterized in that, At least one second groove (12) is provided on at least one side of the diaphragm body (1) along its thickness direction, and the second groove (12) is provided around the first groove (11), wherein the first groove (11) and the second groove (12) or two adjacent second grooves (12) are spaced apart.

4. The separator structure according to claim 3, characterized in that, The second groove (12) is in the form of a ring structure around the first groove (11), and the second groove (12) is in the form of a continuous ring structure or a discontinuous ring structure, and all the second grooves (12) are arranged in turn outwardly around the center of the first groove (11).

5. The separator structure according to claim 4, characterized in that The first groove (11) is in the form of a triangle, a circle, an ellipse or a polygon, and / or The second groove (12) is in the form of a triangular ring, a circular ring, an elliptical ring or a polygonal ring, and when the second groove (12) is in the form of a discontinuous ring structure, the second grooves (12) on the same ring include a plurality of third grooves (13), and two adjacent third grooves (13) on the same ring are spaced apart.

6. The separator structure according to claim 3, characterized by The cross-sectional area of at least part of the area of the first groove (11) recessed along the thickness direction is greater than the area of the opening of the first groove (11); And / or, the cross-sectional area of at least part of the area of the second groove (12) recessed along the thickness direction is greater than the area of the opening of the second groove (12).

7. The separator structure according to claim 3, characterized by The area of the opening of the second groove (12) on each ring decreases in turn outwardly from the first groove (11), and / or The maximum groove depth of the second groove (12) on each ring decreases in turn outwardly from the first groove (11).

8. The separator structure according to claim 7, characterized by The area of the opening of the first groove (11) accounts for 35% to 50% of the surface area of the diaphragm body (1), and the area of the opening of the second groove (12) on each ring is 30% to 50% of the area of the opening of the first groove (11) adjacent thereto or the area of the opening of the second groove (12) adjacent thereto and closer to the first groove (11).

9. The separator structure according to claim 7, characterized by The maximum groove depth of the first groove (11) is 1 to 1.5 μm, and the maximum groove depth of the second groove (12) on each ring is 0.1 to 0.15 μm less than the maximum groove depth of the first groove (11) adjacent thereto or the second groove (12) adjacent thereto and closer to the first groove (11).

10. A battery, characterized by An anode electrode, a cathode electrode, an electrolyte and a diaphragm structure according to any one of claims 1 to 9, the diaphragm structure being arranged between the anode electrode and the cathode electrode.

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