A power bank protection layer based on fire extinguishing microcapsules

Abstract

The utility model belongs to the technical field of power bank safety protection, concretely is a kind of power bank protective layer based on fire-extinguishing microcapsule, including substrate, one side of substrate is connected with the inner wall of power bank by glue, the other side of substrate is provided with tenacity protective layer, fire-extinguishing microcapsule is accommodated between substrate and tenacity protective layer by extrusion filling mode, substrate is flame-retardant polycarbonate forming structure, fire-extinguishing microcapsule is flame-retardant rubber forming structure;The utility model discloses by fire-extinguishing microcapsule is saved between substrate and tenacity protective layer in pressurized mode, when tenacity protective layer is partially broken, fire-extinguishing microcapsule can flow to the broken mouth under internal pressure, in this way, the number of microcapsule at broken mouth is significantly improved, at this time, the concentrated large amount of microcapsule is broken simultaneously, forms concentrated fire-extinguishing group, to improve fire-extinguishing success rate.

Description

Technical Field

[0001] This utility model belongs to the field of power bank safety protection technology, and in particular relates to a power bank protective layer based on fire extinguishing microcapsules. Background Technology

[0002] With the increasing capacity of portable power banks and the development of fast charging technology, their internal battery cells are at risk of thermal runaway under high load operation or external damage. High temperatures may lead to continuous heat diffusion or even combustion. Existing power banks mostly adopt passive safety measures such as explosion-proof films, heat insulation pads, and flame-retardant structures, but active fire extinguishing technology is still relatively insufficient. Fire extinguishing microcapsules, due to their temperature-sensitive rupture and targeted release of extinguishing agents, have been explored to some extent in the field of battery safety. However, most microcapsules in the current technology are coating-type, uniformly distributed structures, which have the following shortcomings: 1. Limited extinguishing agent release range: Microcapsules are released only in the localized rupture area, making cross-regional resupply difficult; 2. The microcapsule structure is loose and lacks mechanical delivery capability: centralized special supply cannot be achieved through mechanical pressure; 3. Insufficient extinguishing agent dosage after temperature triggering: In localized high-power overheating scenarios, insufficient supply leads to reduced extinguishing efficiency.

[0003] Therefore, a structure is needed that can automatically deliver more fire extinguishing microcapsules to the hot spot and maintain a high release rate when the battery cell is triggered by local overheating. Utility Model Content

[0004] The purpose of this invention is to provide a protective layer for power banks based on fire extinguishing microcapsules, which solves the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model is a protective layer for a power bank based on fire extinguishing microcapsules, including a base layer. One side of the base layer is connected to the inner wall of the power bank by adhesive, and the other side of the base layer is provided with a tough protective layer. The base layer and the tough protective layer are filled with fire extinguishing microcapsules by extrusion filling. The base layer is a flame-retardant polycarbonate molding structure, and the fire extinguishing microcapsules are a flame-retardant rubber molding structure.

[0006] Furthermore, the tough protective layer is fixed to the base layer around the side closest to the base layer with adhesive.

[0007] Furthermore, a clamping frame is provided on the side of the toughness protective layer away from the bonding with the substrate layer, and an expansion space for the toughness protective layer is formed in the middle of the clamping frame.

[0008] Furthermore, double-sided adhesive is bonded around the base layer to the tough protective layer, with the other end of the double-sided adhesive bonded to the clamping frame, and the double-sided adhesive is also located around the bonding area between the tough protective layer and the base layer.

[0009] Furthermore, the rupture temperature of both the tough protective layer and the fire extinguishing microcapsule is 90℃-150℃.

[0010] Furthermore, the clamping frame is a flame-retardant polycarbonate molded structure.

[0011] This utility model has the following beneficial effects: This invention preserves fire extinguishing microcapsules under pressure between a base layer and a tough protective layer. When the tough protective layer partially ruptures, the fire extinguishing microcapsules can flow towards the rupture point under internal pressure. As a result, the number of microcapsules at the rupture point is significantly increased. At this time, a large number of concentrated microcapsules rupture simultaneously, forming a concentrated fire extinguishing cluster, thereby improving the fire extinguishing success rate.

[0012] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of this utility model from below; Figure 2 for Figure 1 A schematic diagram of the split structure; Figure 3 A top view schematic diagram of the tough protective layer and the fire extinguishing capsule; Figure 4 This is a schematic diagram showing the structural trends of the fire extinguishing microcapsule in its normal and fire extinguishing states in this utility model; The attached diagram lists the components represented by each number as follows: In the diagram: 1. Base layer; 2. Tough protective layer; 3. Compression frame; 4. Double-sided adhesive; 5. Fire extinguishing microcapsule. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] In the description of this utility model, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around" and other terms indicating orientation or positional relationship are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0017] Please see Figures 1-4 As shown, this utility model is a protective layer for a power bank based on fire extinguishing microcapsules, including a base layer 1. One side of the base layer 1 is connected to the inner wall of the power bank by adhesive, and the other side of the base layer 1 is provided with a tough protective layer 2. Fire extinguishing microcapsules 5 are accommodated between the base layer 1 and the tough protective layer 2 by extrusion filling. The base layer 1 is a flame-retardant polycarbonate molding structure, and the fire extinguishing microcapsules 5 are a flame-retardant rubber molding structure. In this embodiment, the flame-retardant polycarbonate has high hardness after curing, ensuring the adhesion to the power bank and preventing the pressure after the fire extinguishing microcapsules 5 are extruded from affecting the bonding stability of the protective layer in the power bank.

[0018] The fire extinguishing microcapsules used in this invention are a type of functional microstructure unit with temperature-sensitive rupture characteristics. Each microcapsule consists of an outer shell and a fire extinguishing core material. The outer shell layer, which is coated on the outermost part of the microcapsule, is a temperature-sensitive and brittle material. Thermal response cracking is achieved by controlling its glass transition temperature (Tg). The outer shell layer is made of one or more of the following: brittle phenolic resin, brittle urea-formaldehyde resin, melamine-formaldehyde resin, thermosensitive and degradable polymer, and controllable fracture polyurea microshell material. The core material is the key substance in the microcapsule that performs the fire extinguishing function. It has the functions of rapid evaporation, heat absorption, dilution of oxygen content, and blocking of chain reaction. The fire extinguishing agents that can be used include perfluorohexanone, perfluoropentanone, pentafluoropropane, sodium bicarbonate microsolution, phosphate ester fire extinguishing agents, etc.

[0019] Furthermore, in order to stably store the fire extinguishing microcapsule 5 between the base layer 1 and the tough protective layer 2, the tough protective layer 2 is fixed to the base layer 1 with adhesive around the side of the base layer 1 closest to it.

[0020] Furthermore, in the molding of the base layer 1, the tough protective layer 2, and the fire extinguishing microcapsule 5, adhesive is first applied to the tough protective layer 2, leaving a small area uncoated. The coated area is then bonded and fixed to the base layer 1. The fire extinguishing microcapsule 5 is injected between the base layer 1 and the tough protective layer 2 through a pressure delivery device. The outside of the injection nozzle at the front end of the delivery device is kept as sealed as possible with the base layer 1 and the tough protective layer 2. After injection, the injection nozzle is quickly withdrawn, and the uncoated base layer 1 and the tough protective layer 2 are pressed together. Finally, adhesive is applied for sealing.

[0021] Furthermore, in order to strengthen the connection between the tough protective layer 2 and the base layer 1, a clamping frame 3 is provided on the side of the tough protective layer 2 away from the adhesive to the base layer 1, and an expansion space for the tough protective layer 2 is formed in the middle of the clamping frame 3; in this embodiment, the clamping frame 3 can also play a role in preventing pressure on the expanded part of the tough protective layer 2.

[0022] Furthermore, double-sided adhesive 4 is bonded around the base layer 1 where it connects to the tough protective layer 2. The other end of the double-sided adhesive 4 is bonded to the clamping frame 3. The double-sided adhesive 4 is also located around the bond between the tough protective layer 2 and the base layer 1. In this embodiment, the double-sided adhesive 4 can firmly connect the clamping frame 3 and the base layer 1, and also strengthen the connection between the tough protective layer 2 and the base layer 1. Moreover, the double-sided adhesive 4 does not increase the overall thickness of the protective layer. To further enhance structural stability, the mating surfaces of the compression frame 3 and the toughness protective layer 2 are also bonded with adhesive.

[0023] Furthermore, the rupture temperature of both the tough protective layer 2 and the fire extinguishing microcapsule 5 is 90℃-150℃. This temperature range is higher than the normal operating temperature of the power bank, but lower than its fire ignition threshold, ensuring timely response.

[0024] Furthermore, the compression frame 3 is a flame-retardant polycarbonate molded structure. After the flame-retardant polycarbonate is cured, it has a large strength and can stably press the edge of the tough protective layer 2 onto the base layer 1, thereby preventing the fire extinguishing microcapsules 5 from leaking out.

[0025] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0026] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A protective layer for a power bank based on fire extinguishing microcapsules, comprising a base layer (1), one side of which is connected to the inner wall of the power bank by adhesive, characterized in that: A tough protective layer (2) is provided on the other side of the base layer (1). Fire extinguishing microcapsules (5) are contained between the base layer (1) and the tough protective layer (2) by extrusion filling. The base layer (1) is a flame-retardant polycarbonate molded structure, and the fire extinguishing microcapsules (5) are flame-retardant rubber molded structures.

2. The power bank protective layer based on fire extinguishing microcapsules according to claim 1, characterized in that: The tough protective layer (2) is fixed to the base layer (1) around the side near the base layer (1) by adhesive.

3. The power bank protective layer based on fire extinguishing microcapsules according to claim 1, characterized in that: A clamping frame (3) is provided on the side of the tough protective layer (2) away from the adhesive layer (1), and an expansion space for the tough protective layer (2) is formed in the middle of the clamping frame (3).

4. The power bank protective layer based on fire extinguishing microcapsules according to claim 3, characterized in that: The base layer (1) is bonded to the tough protective layer (2) with double-sided adhesive (4) at one end, and the other end of the double-sided adhesive (4) is bonded to the clamping frame (3). The double-sided adhesive (4) is also located around the bond between the tough protective layer (2) and the base layer (1).

5. The power bank protective layer based on fire extinguishing microcapsules according to claim 1, characterized in that: The rupture temperature of both the tough protective layer (2) and the fire extinguishing microcapsule (5) is 90℃-150℃.

6. The power bank protective layer based on fire extinguishing microcapsules according to claim 3, characterized in that: The clamping frame (3) is a flame-retardant polycarbonate molded structure.

Images