An even-heating insulation plate between lithium cells

Abstract

The utility model discloses a kind of even heat insulation plates between lithium battery cell, its structure includes lithium battery module, several battery cells are equipped in the lithium battery module, the battery cell is sequentially spliced into, further include base layer and heat-conducting insulation layer: the base layer is located between adjacent battery cell, and adopt epoxy board or foam cotton;Heat-conducting insulation layer is arranged in at least one surface of base layer, heat-conducting insulation layer is with nano alumina (Al2O3) as main material, thickness size is in the preset range that can disperse battery cell temperature, and heat-conducting insulation layer has insulation performance, the thickness range of heat-conducting insulation layer is 5-50 μm, heat-conducting insulation layer is combined with the base layer by the mode of coating, sticking or pressing, heat-conducting insulation layer also contains one or more auxiliary materials in silicon rubber, epoxy resin or boron nitride.The utility model belongs to the field of lithium battery, specifically refers to a kind of even heat insulation plates between lithium battery cell.

Description

Technical Field

[0001] This utility model belongs to the field of lithium batteries, specifically referring to a heat-equalizing insulating plate between lithium battery cells. Background Technology

[0002] With the advancement of global electrification, lithium-ion batteries are increasingly widely used in new energy vehicles, energy storage systems, and other fields. However, frequent lithium battery safety incidents have become a core concern for the industry. Besides misuse, deficiencies in battery design regarding thermal management are particularly prominent. Currently, lithium battery modules are typically composed of cells connected in series and parallel. The insulating and heat-insulating layers between the cells are mostly made of epoxy boards or foam. While these offer cost advantages, their thermal conductivity is extremely low (typically <0.3W / (m·K)), failing to effectively dissipate the heat generated during charging and discharging. Experiments show that during high-current charging and discharging, the center temperature of the large surface area of ​​a lithium battery can reach 60-80℃, while the top temperature is only 30-40℃. This significant temperature gradient not only accelerates battery aging but may also trigger thermal runaway. Replacing the insulating layer with a metal heat-conducting plate poses a risk of insulation failure due to the conductivity of the metal. Therefore, a new solution that balances thermal conductivity and insulation is urgently needed. Utility Model Content

[0003] The present invention mainly addresses the aforementioned technical problems.

[0004] To solve the above problems, the technical solution adopted by this utility model is as follows: The lithium battery cell heat-equalizing insulating plate proposed by this utility model includes a lithium battery module, wherein the lithium battery module is provided with a plurality of cells, which are sequentially spliced ​​together, and also includes a base layer and a thermally conductive insulating layer:

[0005] The base layer is located between adjacent battery cells and is made of epoxy board or foam;

[0006] The thermally conductive insulating layer is disposed on at least one surface of the base layer. The thermally conductive insulating layer uses nano-alumina (Al2O3) as the main material, and its thickness is within a preset range that can disperse the temperature of the battery cell. The thermally conductive insulating layer also has insulating properties.

[0007] Furthermore, the thickness of the thermally conductive insulating layer ranges from 5 to 50 μm.

[0008] Furthermore, the thermally conductive insulating layer is bonded to the base layer by coating, pasting, or pressing.

[0009] Furthermore, the thermally conductive insulating layer also includes one or more auxiliary materials selected from silicone rubber, epoxy resin, or boron nitride.

[0010] Furthermore, the thermally conductive insulating layer is provided on both sides of the base layer, forming a symmetrical composite double-layer structure.

[0011] The beneficial effects of this utility model by adopting the above structure are as follows:

[0012] 1. The thermal insulation plate between lithium battery cells proposed in this solution reduces the temperature gradient at the center of the battery cell while maintaining insulation performance, making the temperature distribution on the surface of the battery cell more uniform.

[0013] 2. The heat-equalizing insulating plate between lithium battery cells proposed in this solution alleviates the local high temperature phenomenon of the battery cells through heat equalization, reduces the probability of thermal runaway triggering, and lowers the safety risk.

[0014] 3. The heat-spreading insulation plate between lithium battery cells proposed in this solution is based on the improvement of the existing base structure, without the need for major adjustments to the module design, and is compatible with mainstream lithium battery module specifications with minimal cost increase. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a partial structural schematic diagram of the present invention.

[0017] Among them, 1. Lithium battery module, 2. Battery cell, 3. Base layer, 4. Thermally conductive insulating layer.

[0018] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof. Detailed Implementation

[0019] 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. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0020] like Figure 1-2 As shown, this utility model proposes a heat-equalizing insulating plate between lithium battery cells, employing a composite structure of a base layer 3 and a thermally conductive insulating layer 4. The base layer 3 utilizes the epoxy board or foam found in existing lithium battery modules 1, retaining its insulation and buffering functions. The thermally conductive insulating layer 4 uses nano-alumina (Al2O3) as the main material (content ≥80%), leveraging the high thermal conductivity of nanomaterials (thermal conductivity can reach 1-5 W / (m·K)). A thin layer with a thickness of 5-50 μm is formed on the surface of the base layer 3, creating a heat conduction path. This layer also possesses insulation properties (volume resistivity ≥10). 14 (Ω·cm) to avoid short circuits between two battery cells.

[0021] In Example 1, a FR-4 epoxy board with a thickness of 0.5 mm was selected as the substrate; nano-alumina (average particle size of 50 nm) and silicone rubber were mixed at a mass ratio of 8:2, and after adding a curing agent, the mixture was coated on one side of the epoxy board and cured at 120°C for 2 hours to form a thermally conductive and insulating layer 4 with a thickness of 20 μm; finally, performance testing was performed.

[0022] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A heat-equalizing insulating plate between lithium battery cells, comprising a lithium battery module (1), wherein the lithium battery module (1) contains a plurality of battery cells (2), the battery cells (2) being sequentially assembled, characterized in that, It also includes a base layer (3) and a thermally conductive insulating layer (4): The base layer (3) is located between adjacent cells (2) and is made of epoxy board or foam; The thermally conductive insulating layer (4) is disposed on at least one surface of the base layer (3). The thermally conductive insulating layer (4) is made of nano-alumina (Al2O3) as the main material, and its thickness is within a preset range that can disperse the temperature of the battery cell (2). The thermally conductive insulating layer (4) has insulating properties.

2. The heat-absorbing insulating plate between lithium battery cells according to claim 1, characterized in that: The thickness of the thermally conductive insulating layer (4) ranges from 5 to 50 μm.

3. The heat-absorbing insulating plate between lithium battery cells according to claim 2, characterized in that: The thermally conductive insulating layer (4) is bonded to the base layer (3) by coating, pasting or pressing.

4. The heat-equalizing insulating plate between lithium battery cells according to claim 3, characterized in that: The thermally conductive insulating layer (4) also includes one or more auxiliary materials selected from silicone rubber, epoxy resin, or boron nitride.

5. A heat-equalizing insulating plate between lithium battery cells according to claim 4, characterized in that: The thermally conductive insulating layer (4) is provided on both sides of the base layer (3), forming a symmetrical composite double-layer structure.

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