Fireproof heat insulation structure of soft package lithium battery

Abstract

The utility model discloses a fireproof heat insulation structure of a soft package lithium battery, relates to the technical field of soft package lithium batteries, and aims to solve the technical problems that the heat dissipation effect of the soft package lithium battery is reduced, the temperature of the battery is too high, and the service life and the performance of the battery are influenced due to the arrangement of the fireproof heat insulation structure on the outer side of the current soft package lithium battery. The lithium battery comprises a lithium battery main body, the outer side of the lithium battery main body is wrapped with a protective layer, the outer side of the protective layer is wrapped with a heat insulation layer, the outer side of the heat insulation layer is wrapped with a heat absorption layer, and the outer side of the heat absorption layer is wrapped with a fireproof layer. When the temperature rises sharply, the conduction speed of heat is slowed down, the aerogel heat insulation layer prevents heat convection and reduces the outward propagation speed of heat, and meanwhile, the aerogel heat insulation layer has a certain heat dissipation effect and has the advantages that the heat dissipation effect is improved while the fireproof and heat insulation effects are improved, and the phenomenon that the service life of the lithium battery main body is influenced by too high heat is reduced.

Description

Technical Field

[0001] This utility model relates to the field of soft-pack lithium battery technology, and more specifically, to a fireproof and heat-insulating structure for soft-pack lithium batteries. Background Technology

[0002] Pouch batteries are a type of lithium battery packaging. Their cells consist of positive electrode material, negative electrode material, separator, and electrolyte. Unlike traditional steel or aluminum-cased lithium batteries, pouch batteries use an aluminum-plastic composite film as their outer shell. This composite film is typically composed of multiple layers, usually including a nylon layer, an aluminum foil layer, and a heat-sealing layer. The nylon layer primarily provides protection, preventing damage from the external environment; the aluminum foil layer blocks air and moisture, ensuring the battery's internal seal; and the heat-sealing layer is used for sealing during the battery packaging process.

[0003] Soft-pack lithium batteries are widely used in the new energy field. However, due to the flammable nature of their electrolyte, they are prone to thermal runaway when subjected to abnormal conditions such as compression, overcharging, or short circuits. This can release a large amount of heat and flammable gases, potentially leading to fires or even explosions. Therefore, it is necessary to add a multi-layer fireproof and heat-insulating structure to the outside of the soft-pack lithium battery to improve its safety. However, relatively little consideration has been given to the heat dissipation generated by the soft-pack lithium battery during normal operation. Excessive heat insulation can affect the heat dissipation efficiency of the battery under normal operating conditions, leading to excessively high battery temperature and affecting battery life and performance. In view of this, we propose a fireproof and heat-insulating structure for soft-pack lithium batteries. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology, adapt to the needs of reality, and provide a fireproof and heat-insulating structure for soft-pack lithium batteries. This solves the technical problem that the current fireproof and heat-insulating structure on the outside of soft-pack lithium batteries reduces its heat dissipation effect, resulting in excessively high battery temperature and affecting battery life and performance.

[0005] To solve the above technical problems, this utility model provides the following technical solution: a fireproof and heat-insulating structure for a soft-pack lithium battery, comprising a lithium battery body, a protective layer wrapped around the outside of the lithium battery body, a heat insulation layer wrapped around the outside of the protective layer, a heat-absorbing layer wrapped around the outside of the heat insulation layer, a fireproof layer wrapped around the outside of the heat-absorbing layer, and a protective layer wrapped around the outside of the fireproof layer.

[0006] The outer wall of the protective layer has a number of vent holes, and the vent holes are hexagonal in shape.

[0007] The utility model discloses a heat conduction speed can slow down when the heat -insulating layer's design can slow down when the lithium battery main part heat runaway, temperature sharp rise, aerogel heat -insulating layer prevents heat convection, reduces the rate of heat outward dissemination, and has certain heat -radiating effect simultaneously, and the heat of lithium battery main part work can be transferred outward, and the design of the heat -absorbing layer can adsorb the heat of radiating, thereby keeping the stability of lithium battery main part work heat, reduces the emergence of overheating phenomenon, and the design of the heat -conducting layer can transfer the heat to the protective layer, thereby realizing the effect of radiating, and the lithium battery main part temperature overheating phenomenon can be reduced, and the influence on service life is reduced.

[0008] Preferably, the material of the heat insulation layer is nano aerogel heat insulation pad, and the thickness of the heat insulation layer is between 10-20mm.

[0009] Preferably, the material of the fireproof layer is ceramic fiber paper, the surface of the fireproof layer is coated with intumescent fire retardant coating, and the thickness of the fireproof layer is between 2-3mm.

[0010] Preferably, the material of the protective layer is composed of metal sheet and fire -retardant rubber, and the thickness of the protective layer is 0.3-0.5mm.

[0011] Preferably, the heat -conducting layer is fixed between the fireproof layer and the protective layer, the surface of the heat -conducting layer is provided with a plurality of U-shaped grooves to form heat -conducting grooves, and the thickness of the heat -conducting grooves is 0.1mm.

[0012] Compared with the prior art, the utility model has the beneficial effects that:

[0013] 1、 the utility model discloses a heat insulation layer's design can slow down when the lithium battery main part heat runaway, temperature sharp rise, aerogel heat -insulating layer prevents heat convection, reduces the rate of heat outward dissemination, and has certain heat -radiating effect simultaneously, and the heat of lithium battery main part work can be transferred outward, and the design of the heat -absorbing layer can adsorb the heat of radiating, thereby keeping the stability of lithium battery main part work heat, reduces the emergence of overheating phenomenon, and the design of the heat -conducting layer can transfer the heat to the protective layer, thereby realizing the effect of radiating, and the lithium battery main part temperature overheating phenomenon can be reduced, and the influence on service life is reduced.

[0014] 2、 the utility model discloses still through the design of the protective layer can strengthen the protection of lithium battery main part while keeping good radiating effect, and the heat -conducting groove that the heat -conducting layer side surface is set up can expand the heat -conducting area, improves the heat -conducting effect, further improves the overall heat -conducting property, strengthens the radiating effect. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the whole structure schematic diagram of the utility model.

[0016] Figure 2 It is the split structure schematic view of the utility model;

[0017] Figure 3 It is Figure 2 The structure enlarged schematic view of A part in the middle;

[0018] Figure 4 It is the partial structure schematic view of the protective layer in the utility model;

[0019] Figure 5 It is the partial structure schematic view of the heat conduction layer in the utility model.

[0020] Mark number explanation in the drawing: 1, lithium battery main body;2, protective layer;201, air hole;3, heat insulation layer;4, heat absorption layer;5, fireproof layer;6, heat conduction layer;601, heat conduction groove;7, protective layer. Specific implementation

[0021] As Figures 1 to 4 Indicated, the utility model relates to a kind of soft package lithium battery fireproof heat insulation structure, including lithium battery main body 1, the outer side of the lithium battery main body 1 is wrapped with protective layer 2, the outer side of the protective layer 2 is wrapped and is provided with heat insulation layer 3, the outer side of the heat insulation layer 3 is wrapped and is provided with heat absorption layer 4, the outer side of the heat absorption layer 4 is wrapped and is provided with fireproof layer 5, the outer side of the fireproof layer 5 is wrapped and is provided with protective layer 7, the outer wall of the protective layer 2 is equipped with several air holes 201, and the shape of the air hole 201 is hexagon;By the cooperation of protective layer 2 and heat absorption layer 4, the heat generated by lithium battery main body 1 can be easily absorbed, the accumulation of heat is reduced, and the influence of heat on the service life of lithium battery main body 1 is reduced.

[0022] In the embodiment of the utility model, the material of the heat insulation layer 3 is nano aerogel heat insulation pad, and the thickness of the heat insulation layer 3 is between 10-20mm;Nano aerogel has unique nano porous network structure, and its porosity is as high as 90% or more, and the thermal conductivity coefficient can be as low as 0.015W / (m·K) at normal temperature, which can greatly limit the conduction of heat.

[0023] In the embodiment of the utility model, the material of the fireproof layer 5 is ceramic fiber paper, the surface of the fireproof layer 5 is coated with intumescent fire retardant paint, and the thickness of the fireproof layer 5 is between 2-3mm; the ceramic fiber paper has good high temperature resistance and mechanical strength, can withstand high temperature above 1200 DEG C and has soft texture, and is convenient for processing and installation. The intumescent fire retardant paint is uniformly coated on the ceramic fiber paper, when high temperature is encountered, the paint rapidly expands to form a dense carbonized layer, the carbonized layer can effectively prevent flame propagation and further insulate heat, and the thickness of the expanded carbonized layer can reach 5-10mm. The thickness of this layer is designed to be 2-3mm (when not expanded), which can ensure the fireproof performance and will not excessively increase the overall structure volume.

[0024] In the embodiment of the utility model, the material of the protection layer 7 is composed of metal sheet and fire -retardant rubber, and the thickness of the protection layer 7 is 0.3-0.5mm; the metal sheet selects aluminum alloy sheet, and the thickness is 0.3-0.5mm, has good thermal conductivity and mechanical strength, can quickly disperse the small amount of heat from the heat insulation layer, and can resist external mechanical impact to a certain extent.

[0025] In the embodiment of the utility model, the heat conducting layer 6 is fixed between the fireproof layer 5 and the protection layer 7, the surface of the heat conducting layer 6 is structured with a plurality of U-shaped grooves to form heat conducting grooves 601, and the thickness of the heat conducting grooves 601 is 0.1mm; the setting of the heat conducting layer 6 can improve the heat conduction effect, facilitate heat transfer, the opening of the heat conducting grooves 601 can increase the heat conduction area, and further improve the heat conduction effect.

[0026] Working principle: the embodiment provides a soft package lithium battery fireproof heat insulation structure, when in use, first through the design of the protection layer 2 can strengthen the protection of lithium battery main body 1, the setting of the air hole 201 can reduce the weight while increasing the air permeability, the heat generated by the lithium battery main body 1 can be dispersed outward, the design of the heat insulation layer 3 can be heat insulation treatment, when the lithium battery main body 1 occurs thermal runaway, the temperature rises sharply, the heat conduction speed is slowed down, the aerogel heat insulation layer prevents heat convection, reduces the rate of heat outward propagation, and has certain heat dissipation effect, the heat generated by the lithium battery main body 1 can be transmitted outward, the design of the heat absorption layer 4 can adsorb the heat dissipated, so as to realize the effect of heat treatment, reduce the phenomenon of high temperature of the lithium battery main body 1, the design of the fireproof layer 5 can reach 5-10mm after expansion of the carbonized layer thickness, when high temperature is encountered, the paint expands rapidly to form a dense carbonized layer, the carbonized layer can effectively prevent flame propagation and further heat insulation, the design of the heat conduction layer 6 can guide the heat absorbed by the heat absorption layer 4 from the position of the fireproof layer 5, so as to realize the effect of heat dissipation of the lithium battery main body 1, through the structure cooperation, the lithium battery main body 1 can keep the heat stable, reduce the phenomenon of high temperature affecting service life, the design of the protection layer 7 can strengthen the protection of the overall structure, improve the overall strength.

[0027] The embodiments of the utility model disclose the better embodiment, but not limited to this, the ordinary skill of the art, the person, the spirit of the utility model is appreciated to the above-mentioned embodiment very easily, and different extension and change are made, but as long as not departing from the spirit of the utility model, all are within the protection scope of the utility model.

Claims

1. A fireproof and heat-insulating structure for a soft-pack lithium battery, characterized in that, The application relates to a lithium battery body (1), the outer side of the lithium battery body (1) is wrapped with a protective layer (2), the outer side of the protective layer (2) is wrapped with a heat insulation layer (3), the outer side of the heat insulation layer (3) is wrapped with a heat absorption layer (4), the outer side of the heat absorption layer (4) is wrapped with a fireproof layer (5), and the outer side of the fireproof layer (5) is wrapped with a protective layer (7). A plurality of air holes (201) are formed in the outer wall of the protective layer (2), and the air holes (201) are hexagonal in shape. 2.The soft-pack lithium battery fireproof and thermal insulation structure according to claim 1, characterized in that, The material of the heat insulation layer (3) is nano aerogel heat insulation pad, and the thickness of the heat insulation layer (3) is between 10-20mm. 3.The soft-pack lithium battery fireproof and thermal insulation structure according to claim 1, characterized in that, The material of the fireproof layer (5) is ceramic fiber paper, the surface of the fireproof layer (5) is coated with intumescent fire retardant paint, and the thickness of the fireproof layer (5) is between 2-3mm. 4.The fireproof and thermal insulation structure of the soft package lithium battery according to claim 1, characterized in that, The material of the protective layer (7) is composed of metal sheet and fire-retardant rubber, and the thickness of the protective layer (7) is 0.3-0.5mm. 5.The soft-pack lithium battery fireproof and thermal insulation structure according to claim 1, characterized in that, A heat conduction layer (6) is fixed between the fireproof layer (5) and the protective layer (7), the surface of the heat conduction layer (6) is provided with a plurality of U-shaped grooves to form heat conduction grooves (601), and the thickness of the heat conduction grooves (601) is 0.1mm.

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