High-performance lithium battery with multi-layer composite structure

Abstract

The utility model belongs to the technical field of lithium batteries, and particularly provides the following scheme aiming at the problems that micropores in a diaphragm are shrunk and the transmission efficiency of lithium electrons is influenced because the diaphragm is shrunk due to the rising of the working temperature of the battery in the charging and discharging process of the conventional lithium battery structure. The lithium battery sequentially comprises a positive electrode, a first diaphragm layer, a negative electrode and a second diaphragm layer from inside to outside; the first diaphragm layer is fixed at the side end of the anode, the cathode is fixed at the side end of the first diaphragm layer, and the second diaphragm layer is fixed at the side end of the cathode; the first diaphragm layer and the second diaphragm layer are made of diaphragm bodies, a plurality of micropores for lithium electrons to pass through are formed in the two diaphragm bodies, a group of limiting components are arranged in the two diaphragm bodies, and the two groups of limiting components are respectively used for limiting the positive electrode and the negative electrode; and by arranging the isolation assembly, the micropores in the diaphragm are accurately positioned, so that smooth transmission of lithium electrons is ensured, and the transmission efficiency of the battery is improved.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to a high-performance lithium battery with a multilayer composite structure. Background Technology

[0002] Traditional lithium battery structures typically include a positive electrode, a separator, and a negative electrode, with the separator located between the positive and negative electrodes, serving to isolate and conduct electricity.

[0003] In traditional lithium battery structures, during charging and discharging, the micropores on the separator shrink due to the increase in battery operating temperature, thus reducing the size of the micropores on the separator, affecting the transmission efficiency of lithium electrons, and consequently affecting the overall performance of the battery. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing lithium battery structures where, during charging and discharging, the micropores on the separator shrink due to the increase in battery operating temperature, thus reducing the micropore size and affecting the lithium electron transmission efficiency. The invention proposes a multilayer composite structure high-performance lithium battery.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A multi-layer composite structure high-performance lithium battery, wherein the lithium battery comprises, from the inside out, a positive electrode, a first separator layer, a negative electrode, and a second separator layer;

[0007] Wherein, the first membrane layer is fixed to the side end of the positive electrode, the negative electrode is fixed to the side end of the first membrane layer, and the second membrane layer is fixed to the side end of the negative electrode;

[0008] Both the first and second separator layers are made of separator membrane bodies. Each of the two separator membrane bodies is provided with a plurality of micropores for lithium electrons to pass through. Each of the two separator membrane bodies is provided with a set of limiting components, which are used to limit the positive and negative electrodes respectively.

[0009] Two sets of isolation components are respectively disposed in two diaphragm membranes, and the two sets of isolation components are used to locate the micropores on the two diaphragm membranes.

[0010] In one possible design, each set of limiting components includes two side bars, which are respectively fixed to both ends of the diaphragm body. An accommodating gap is formed between the diaphragm body and the two side bars, and the positive electrode is disposed within the accommodating gap. The two side bars are respectively disposed at both ends of the positive electrode.

[0011] In one possible design, each set of the limiting components further includes two limiting strips, which are respectively fixed to the adjacent ends of the two side bars, and the two limiting strips are respectively pressed into contact with the two ends of the positive electrode.

[0012] In one possible design, all four side rails and four limit rails are made of silicone rubber.

[0013] In one possible design, each set of the isolation components includes multiple limiting posts, which are uniformly fixed within the diaphragm body. The multiple limiting posts are used to divide the diaphragm body into multiple sections, and each of the multiple limiting posts is fixed between two side bars.

[0014] In one possible design, all of the limiting posts are glass fiber rods.

[0015] In this application, during use, the separator membrane forms an accommodating gap through two side baffles to more stably accommodate the positive electrode. At the same time, multiple limiting posts uniformly fixed on the inner wall of the separator membrane, together with the two side baffles, divide the separator membrane into multiple small areas. When the battery overheats, the multiple small areas formed by the multiple limiting posts and the two side baffles can remain stable and will not shrink, thereby ensuring the smooth passage of lithium ions.

[0016] Beneficial effects: In this utility model, the multi-layer composite structure high-performance lithium battery effectively fixes the positive and negative electrodes by setting a limiting component, preventing the movement of the positive and negative electrodes during charging and discharging, and improving the stability of the battery.

[0017] In this invention, the multilayer composite high-performance lithium battery, by setting an isolation component, accurately positions the micropores on the separator, ensuring smooth transmission of lithium electrons and improving the battery's transmission efficiency.

[0018] In this invention, both the side guard strip and the limiting strip are made of silicone rubber, which has good elasticity and wear resistance, and can ensure that the limiting effect is maintained even after long-term use. Attached Figure Description

[0019] Figure 1 This is a first partial perspective view of the multilayer composite structure high-performance lithium battery proposed in this utility model.

[0020] Figure 2 This is a second partial perspective view of the high-performance lithium battery with a multi-layer composite structure proposed in this utility model.

[0021] In the diagram: 1. Positive electrode; 2. First membrane layer; 3. Negative electrode; 4. Second membrane layer; 5. Limiting post; 6. Membrane body; 7. Side bar; 8. Limiting bar. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Example 1: Refer to Figures 1-2 A lithium battery, used in the field of lithium battery technology, has a structure comprising, from the inside out, a positive electrode 1, a first separator layer 2, a negative electrode 3, and a second separator layer 4. The structure of each part and their interrelationships will be described in detail below.

[0024] The positive electrode 1 uses conventional lithium battery positive electrode materials, such as lithium cobalt oxide, lithium manganese oxide, or nickel-cobalt-manganese ternary materials. The negative electrode 3 uses conventional lithium battery negative electrode materials, such as graphite or silicon-carbon composite materials.

[0025] Both the first separator layer 2 and the second separator layer 4 are made of separator membrane 6. Separator membrane 6 is a porous thin film that allows lithium electrons to pass through while preventing direct contact between the positive and negative electrodes. Multiple micropores are uniformly distributed within separator membrane 6 to ensure smooth movement of lithium electrons between the positive and negative electrodes.

[0026] To secure the positive electrode 1 and the negative electrode 3, a set of limiting components is provided within the membrane body 6 of both the first membrane layer 2 and the second membrane layer 4. Each set of limiting components includes two side baffles 7 and two limiting strips 8. The side baffles 7 are fixed to both ends of the membrane body 6, forming a receiving gap, within which the positive electrode 1 or the negative electrode 3 is placed. The two side baffles 7 are located at both ends of the positive electrode 1 or the negative electrode 3, providing initial limiting. Furthermore, the two limiting strips 8 are fixed to the adjacent ends of the two side baffles 7, making contact with the ends of the positive electrode 1 or the negative electrode 3, thereby ensuring that the positive and negative electrodes do not move during charging and discharging.

[0027] Both the side guard strip 7 and the limiting strip 8 are made of silicone rubber, a material with good elasticity and wear resistance, which can ensure that the limiting effect is maintained even after long-term use.

[0028] Example 2: Reference Figures 1-2 An improvement upon Example 1 is made by adding an isolation assembly to locate the micropores on the diaphragm membrane 6. Each isolation assembly includes multiple limiting posts 5, which are uniformly fixed within the diaphragm membrane 6, dividing the diaphragm membrane 6 into multiple sections. The presence of the limiting posts 5 not only helps maintain the uniform distribution of the micropores but also prevents the diaphragm membrane 6 from deforming during charging and discharging. In this embodiment, the limiting posts 5 are made of glass fiber rods, a material with high strength and good insulation, making it ideal for this purpose.

[0029] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. Multilayer composite high performance lithium battery, characterized in that, The lithium battery comprises, from inside to outside, a positive electrode (1), a first diaphragm layer (2), a negative electrode (3) and a second diaphragm layer (4); The first diaphragm layer (2) is fixed to the side end of the positive electrode (1), the negative electrode (3) is fixed to the side end of the first diaphragm layer (2), and the second diaphragm layer (4) is fixed to the side end of the negative electrode (3); The first diaphragm layer (2) and the second diaphragm layer (4) are both made of diaphragm membranes (6), a plurality of micropores for lithium electrons to pass through are arranged in each diaphragm membrane (6), and a set of limiting assemblies are arranged in each diaphragm membrane (6), which are used for limiting the positive electrode (1) and the negative electrode (3) respectively. Two sets of isolation assemblies are arranged in the two diaphragm membranes (6), and the two sets of isolation assemblies are used for positioning the micropores on the two diaphragm membranes (6).

2. The multi-layer composite structure high performance lithium battery of claim 1, wherein, Each set of limiting assemblies comprises two side blocking strips (7), the two side blocking strips (7) are fixed to the two ends of the diaphragm membrane (6), respectively, a containing gap is formed between the diaphragm membrane (6) and the two side blocking strips (7), the positive electrode (1) is arranged in the containing gap, and the two side blocking strips (7) are arranged at the two ends of the positive electrode (1), respectively.

3. The multi-layer composite structure high performance lithium battery of claim 2, wherein, Each set of limiting assemblies further comprises two limiting strips (8), the two limiting strips (8) are fixed to the end portions of the two side blocking strips (7) close to each other, and the two limiting strips (8) are in extrusion contact with the two ends of the positive electrode (1), respectively.

4. The multi-layer composite structure high performance lithium battery of claim 3, wherein, The four side blocking strips (7) and the four limiting strips (8) are both made of silicone rubber.

5. The multi-layer composite structure high performance lithium battery of claim 2, wherein, Each set of isolation assemblies comprises a plurality of limiting columns (5), the plurality of limiting columns (5) are uniformly fixed in the diaphragm membrane (6), the plurality of limiting columns (5) are used for dividing the diaphragm membrane (6) into a plurality of blocks, and the plurality of limiting columns (5) are fixed between the two side blocking strips (7).

6. The multi-layer composite structure high performance lithium battery of claim 5, wherein, The plurality of limiting columns (5) are all glass fiber rods.

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