Flame-retardant thermal barrier film for lithium batteries

Abstract

The utility model discloses a kind of fire-retardant heat-insulating films for lithium battery, it includes base layer, heat-insulating layer, fire-retardant layer, adhesive layer, first reinforcing layer, elastic buffer layer, wear-resistant module;The heat-insulating layer is stacked on the lower surface of base layer;The fire-retardant layer is stacked on the surface of heat-insulating layer;The adhesive layer is stacked on the surface of fire-retardant layer;The first reinforcing layer is stacked on the upper surface of base layer;The wear-resistant module is stacked on the surface of elastic buffer layer.Elastic buffer layer is stacked on the surface of first reinforcing layer, the volume change of battery cell during charging and discharging can be absorbed, mutual extrusion between battery cell is avoided, effectively prevent battery cell damage or abnormal, again cooperate with the surface of elastic buffer layer with multiple air slots, the design of air slot can further improve the capacity of elastic buffer layer absorption battery cell volume change, through-hole and air slot communication effectively avoid when temperature rises, gas in air slot expands, leading to wear-resistant module drop, effectively prolong the service life of heat-insulating film.

Description

Technical Field

[0001] This utility model relates to the field of battery separator technology, and in particular to a flame-retardant and heat-insulating film for lithium batteries. Background Technology

[0002] Lithium-ion batteries are rechargeable batteries that primarily function by the movement of lithium ions between the positive and negative electrodes. During charging and discharging, Li... + Intercalation and deintercalation back and forth between the two electrodes: During charging, Li + The lithium is extracted from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the process is reversed during discharge. Because lithium-ion batteries can burn when abnormal, and the burning rate is very fast, manufacturers currently sandwich battery insulation films between the cells to minimize the risk of abnormalities. These films provide heat insulation and flame retardancy, effectively protecting the cells.

[0003] During charging and discharging, battery cells expand or contract in volume. Current battery insulation films only provide insulation and cannot absorb these volume changes. When a cell expands, it squeezes against itself, causing damage and malfunctions, potentially leading to fires and other safety incidents. Therefore, it is necessary to improve existing battery insulation films. Utility Model Content

[0004] In view of this, the present invention addresses the deficiencies of the existing technology and its main purpose is to provide a flame-retardant heat-insulating film for lithium batteries. This film can effectively solve the problem that existing battery heat-insulating films only have a heat-insulating function and cannot absorb the volume changes of the battery cells, causing the battery cells to squeeze against each other, resulting in battery cell damage, abnormal battery cell behavior, and even fire and other safety accidents.

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

[0006] A flame-retardant and heat-insulating film for lithium batteries includes a base layer, a heat-insulating layer, a flame-retardant layer, an adhesive layer, a first reinforcing layer, an elastic buffer layer, and a wear-resistant module. The heat-insulating layer is stacked on the lower surface of the base layer; the flame-retardant layer is stacked on the surface of the heat-insulating layer; the adhesive layer is stacked on the surface of the flame-retardant layer; the first reinforcing layer is stacked on the upper surface of the base layer; the elastic buffer layer is stacked on the surface of the first reinforcing layer, and the surface of the elastic buffer layer has multiple slots; the wear-resistant module is stacked on the surface of the elastic buffer layer, and the surface of the wear-resistant module has multiple through holes, each through hole communicating with a corresponding slot.

[0007] As a preferred embodiment, the heat insulation layer is made of epoxy resin and is filled with hollow glass microspheres or aerogel powder. The porous structure of the hollow glass microspheres and aerogel powder blocks the heat conduction path, thereby improving the heat insulation performance of the epoxy resin.

[0008] As a preferred embodiment, the flame-retardant layer is made of ABS material and is filled with magnesium hydroxide. Magnesium hydroxide has excellent flame-retardant properties, smoke-suppressing effect, and can neutralize acidic and corrosive gases generated during combustion, effectively improving the flame-retardant performance of the flame-retardant layer.

[0009] As a preferred embodiment, the first reinforcing layer is made of TPU material.

[0010] As a preferred embodiment, the elastic buffer layer is made of polyurethane.

[0011] As a preferred embodiment, the wear-resistant module includes a second reinforcing layer and a wear-resistant layer, the aforementioned plurality of through holes all penetrate the second reinforcing layer and the wear-resistant layer, and the second reinforcing layer is stacked on the surface of the elastic buffer layer, and the wear-resistant layer is stacked on the surface of the second reinforcing layer.

[0012] As a preferred option, the second reinforcing layer is made of TPU material.

[0013] As a preferred embodiment, it further includes a release liner that is adhered to the adhesive layer.

[0014] Compared with the prior art, this utility model has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solution:

[0015] By stacking an elastic buffer layer on the surface of the first reinforcing layer, the elastic buffer layer has excellent elasticity and can absorb the volume changes of the battery cell during charging and discharging, thereby avoiding mutual compression between the battery cells, effectively preventing battery cell damage or abnormalities, and preventing safety accidents such as battery cell combustion. In addition, the surface of the elastic buffer layer has multiple slots. The slot design can further improve the elastic buffer layer's ability to absorb the volume changes of the battery cell. The through holes are connected to the slots to effectively prevent the gas in the slots from expanding when the temperature rises, which would cause the wear-resistant module to fall off, effectively extending the service life of the heat insulation film.

[0016] To more clearly illustrate the structural features and effects of this utility model, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments: Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of a preferred embodiment of the present invention.

[0018] Explanation of reference numerals in the attached diagram:

[0019] 10. Base layer; 20. Insulation layer

[0020] 30. Flame retardant layer; 40. Adhesive layer

[0021] 50. First reinforcing layer; 60. Elastic buffer layer

[0022] 61. Empty slot; 70. Wear-resistant module

[0023] 701, Through Hole 71, Second Reinforcing Layer

[0024] 72. Wear-resistant layer. Detailed Implementation

[0025] Please refer to Figure 1 As shown, it illustrates the specific structure of a preferred embodiment of the present invention, including a base layer 10, a heat insulation layer 20, a flame retardant layer 30, an adhesive layer 40, a first reinforcing layer 50, an elastic buffer layer 60, and a wear-resistant module 70.

[0026] The heat insulation layer 20 is stacked on the lower surface of the base layer 10. In this embodiment, the heat insulation layer 20 is made of epoxy resin and is filled with hollow glass microspheres or aerogel powder. The porous structure of the hollow glass microspheres and aerogel powder is used to block the heat conduction path, thereby improving the heat insulation performance of the epoxy resin.

[0027] The flame retardant layer 30 is stacked on the surface of the heat insulation layer 20. In this embodiment, the flame retardant layer 30 is made of ABS material and is filled with magnesium hydroxide. Magnesium hydroxide has excellent flame retardant properties, smoke suppression effect, and can neutralize the acidic and corrosive gases generated during combustion, effectively improving the flame retardant performance of the flame retardant layer 30.

[0028] The adhesive layer 40 is stacked on the surface of the flame retardant layer 30.

[0029] The first reinforcing layer 50 is stacked on the upper surface of the base layer 10; in this embodiment, the first reinforcing layer 50 is made of TPU material.

[0030] The elastic buffer layer 60 is stacked on the surface of the first reinforcing layer 50, and the surface of the elastic buffer layer 60 has a plurality of slots 61; in this embodiment, the elastic buffer layer 60 is made of polyurethane.

[0031] The wear-resistant module 70 is stacked on the surface of the elastic buffer layer 60, and the surface of the wear-resistant module 70 has a plurality of through holes 701, each of which communicates with a corresponding slot 61. In this embodiment, the wear-resistant module 70 includes a second reinforcing layer 71 and a wear-resistant layer 72. The aforementioned plurality of through holes 701 all penetrate the second reinforcing layer 71 and the wear-resistant layer 72. The second reinforcing layer 71 is stacked on the surface of the elastic buffer layer 60, and the wear-resistant layer 72 is stacked on the surface of the second reinforcing layer 71. The second reinforcing layer 71 is made of TPU material. Specifically, a layer of adhesive is first applied to the elastic buffer layer 60, and then the wear-resistant module 70 is stacked and fixed on the surface of the elastic buffer layer 60.

[0032] Furthermore, it includes release paper 80, which is adhered to the adhesive layer 40.

[0033] The key design feature of this utility model is:

[0034] By stacking an elastic buffer layer on the surface of the first reinforcing layer, the elastic buffer layer has excellent elasticity and can absorb the volume changes of the battery cell during charging and discharging, thereby avoiding mutual compression between the battery cells, effectively preventing battery cell damage or abnormalities, and preventing safety accidents such as battery cell combustion. In addition, the surface of the elastic buffer layer has multiple slots. The slot design can further improve the elastic buffer layer's ability to absorb the volume changes of the battery cell. The through holes are connected to the slots to effectively prevent the gas in the slots from expanding when the temperature rises, which would cause the wear-resistant module to fall off, effectively extending the service life of the heat insulation film.

[0035] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A flame-retardant and heat-insulating film for lithium batteries, characterized in that: It includes a base layer, a heat insulation layer, a flame retardant layer, an adhesive layer, a first reinforcing layer, an elastic buffer layer, and a wear-resistant module. The heat insulation layer is stacked on the lower surface of the base layer; the flame retardant layer is stacked on the surface of the heat insulation layer; the adhesive layer is stacked on the surface of the flame retardant layer; the first reinforcing layer is stacked on the upper surface of the base layer; the elastic buffer layer is stacked on the surface of the first reinforcing layer, and the surface of the elastic buffer layer has multiple slots; the wear-resistant module is stacked on the surface of the elastic buffer layer, and the surface of the wear-resistant module has multiple through holes, each through hole communicating with a corresponding slot.

2. The flame-retardant and heat-insulating film for lithium batteries according to claim 1, characterized in that: The heat insulation layer is made of epoxy resin and is filled with hollow glass microspheres or aerogel powder.

3. The flame-retardant and heat-insulating film for lithium batteries according to claim 1, characterized in that: The flame-retardant layer is made of ABS material and is filled with magnesium hydroxide.

4. The flame-retardant and heat-insulating film for lithium batteries according to claim 1, characterized in that: The first reinforcing layer is made of TPU material.

5. The flame-retardant and heat-insulating film for lithium batteries according to claim 1, characterized in that: The elastic buffer layer is made of polyurethane.

6. The flame-retardant and heat-insulating film for lithium batteries according to claim 1, characterized in that: The wear-resistant module includes a second reinforcing layer and a wear-resistant layer. The aforementioned plurality of through holes all penetrate the second reinforcing layer and the wear-resistant layer. The second reinforcing layer is stacked on the surface of the elastic buffer layer, and the wear-resistant layer is stacked on the surface of the second reinforcing layer.

7. The flame-retardant and heat-insulating film for lithium batteries according to claim 6, characterized in that: The second reinforcing layer is made of TPU material.

8. The flame-retardant and heat-insulating film for lithium batteries according to claim 1, characterized in that: It further includes release paper, which is applied to the adhesive layer.

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