Heat insulation pad for lithium battery pack

Abstract

The utility model relates to the technical field of lithium batteries, in particular to a heat insulation pad for a lithium battery pack, which comprises a heat insulation pad main body, and the heat insulation pad main body sequentially comprises a first phase change heat absorption layer, a first framework, an aerogel heat insulation layer, a second framework and a second phase change heat absorption layer from top to bottom, the first phase change heat absorption layer and the second phase change heat absorption layer are both made of polyethylene fiber base materials, the first phase change heat absorption layer and the second phase change heat absorption layer are both coated with nanometer metal oxide with heat storage capacity, and the first framework and the second framework are made of nanometer hollow microspheres. The high-safety lithium battery pack has the effects of meeting the use requirements of the high-safety lithium battery pack and improving the heat insulation effect.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a heat insulation pad for a lithium battery pack. Background Art

[0002] A lithium battery pack is a structure in which battery cells are directly grouped into a battery pack, i.e., a battery pack. It is widely used in industries such as electric vehicles, energy storage systems, mobile devices, drones, and various industrial equipment. The lithium battery packs currently used usually include multiple batteries placed side by side and thermal insulation pads located between the multiple batteries. The thermal insulation pads can prevent heat from being conducted and diffused inside the battery pack, thereby improving the thermal management capabilities and safety of the battery pack.

[0003] In the prior art, the same thermal insulation pad needs to block the heat conduction of batteries on both sides at the same time and needs to meet higher thermal insulation requirements to reduce the possibility of thermal runaway of the battery. However, the thermal insulation pads currently on the market are mainly made of aerogel, polyurethane foam or silicone foam. The materials used are single and the thermal insulation effect is not ideal. They cannot meet the use requirements of high-safety lithium battery packs and need to be urgently solved. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the present application provides a thermal insulation pad for a lithium battery pack.

[0005] The above invention objectives of the present application are achieved through the following technical solutions:

[0006] The thermal insulation pad body comprises, from top to bottom, a first phase change heat absorption layer, a first skeleton, an aerogel insulation layer, a second skeleton and a second phase change heat absorption layer, the first phase change heat absorption layer and the second phase change heat absorption layer both adopt a polyethylene fiber substrate, the first phase change heat absorption layer and the second phase change heat absorption layer are both coated with nano metal oxides with heat storage capacity, and the first skeleton and the second skeleton are made of nano hollow microspheres.

[0007] By adopting the above technical solution, a polyethylene fiber substrate is used as a basic material, and a variety of nano metal oxides with heat storage capacity are evenly coated on one side of the polyethylene fiber substrate by a coating method to increase the heat absorption capacity of the polyethylene fiber substrate and improve its thermal conductivity, so as to form a phase change heat absorption layer, so that when the battery contacts the thermal insulation pad, the first phase change heat absorption layer or the second phase change heat absorption layer located on the outside can quickly absorb heat and quickly dissipate heat. Nano hollow microspheres are used as the first skeleton or the second skeleton. The nano hollow microspheres have low thermal conductivity, and their hollow structure can effectively prevent heat conduction, significantly reducing The transfer of heat can prevent the spread of open flames. At the same time, the nano hollow microbeads can quickly return to their original shape after being expanded and compressed by the battery, and have good compression performance and stability. At the same time, the support inside the thermal insulation pad is enhanced. The extremely low thermal conductivity of the aerogel thermal insulation layer itself is used to set the aerogel thermal insulation layer between the first phase change heat absorption layer and the second phase change heat absorption layer to block the heat transfer of the batteries on both sides of the thermal insulation pad, thereby improving the safety factor of the lithium battery pack. The above five layers complement each other and are symmetrically arranged. The structural design can enable the thermal insulation pad to meet the use requirements of high-safety lithium battery packs while improving the thermal insulation effect.

[0008] In a preferred example, the present application can be further configured as follows: the first phase change heat absorption layer, the first skeleton, the aerogel insulation layer, the second skeleton and the second phase change heat absorption layer are adhered and fixed by coating and pressing.

[0009] By adopting the above technical solution, the coating and pressing method can ensure uniform bonding between the layers, can be applicable to the bonding between layers of different materials, and can achieve a lightweight design of the insulation pad, reduce additional burden and weight, and simplify the production process.

[0010] In a preferred example, the present application may be further configured as follows: an adhesive layer is disposed on the outside of the first phase-change heat absorption layer and the outside of the second phase-change heat absorption layer.

[0011] By adopting the above technical solution, the thermal insulation pad can be attached between two batteries by bonding, thereby completing the thermal insulation assembly of the lithium battery pack.

[0012] In a preferred example, the present application can be further configured as follows: the aerogel insulation layer is prepared by mixing aerogel particles and an adhesive.

[0013] By adopting the above technical solution, aerogel particles are mixed with adhesive to form a uniform coating, which can play a role of heat insulation and is elastic. By applying it on the skeleton multiple times, the elasticity of the insulation pad is improved, and the compression performance of the insulation pad is further improved.

[0014] In summary, the present application includes at least one of the following beneficial technical effects:

[0015] 1. Using polyethylene fiber substrate as the basic material, a variety of nano metal oxides with heat storage capacity are evenly coated on one side of the polyethylene fiber substrate by a coating method to increase the heat absorption capacity of the polyethylene fiber substrate and improve its thermal conductivity to form a phase change heat absorption layer, so that when the battery contacts the thermal insulation pad, the first phase change heat absorption layer or the second phase change heat absorption layer located on the outside can quickly absorb heat and quickly dissipate heat. Nano hollow microspheres are used as the first skeleton or the second skeleton. Nano hollow microspheres have low thermal conductivity, and their hollow structure can effectively prevent heat conduction and significantly reduce the heat transfer. The aerogel heat insulation layer itself has an extremely low thermal conductivity, and the aerogel heat insulation layer is arranged between the first phase change heat absorption layer and the second phase change heat absorption layer to block the heat transfer of the batteries on both sides of the heat insulation pad, thereby improving the safety factor of the lithium battery pack. The above five layers complement each other and are symmetrically arranged. The structural design can make the heat insulation pad meet the use requirements of high-safety lithium battery packs while improving the heat insulation effect.

[0016] 2. The coating and pressing method can ensure uniform bonding between the layers, can be applicable to the bonding between layers of different materials, and can achieve lightweight design of the thermal insulation pad, reduce additional burden and weight, and simplify the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of a heat insulating pad for a lithium battery pack in one embodiment of the present application;

[0018] Figure 2 It is a partial structural schematic diagram of a thermal insulation pad for a lithium battery pack in one embodiment of the present application when it is working.

[0019] Figure numerals: 1. thermal insulation pad body; 2. first phase change heat absorption layer; 3. first skeleton; 4. aerogel thermal insulation layer; 5. second skeleton; 6. second phase change heat absorption layer; 7. battery; 8. adhesive layer. DETAILED DESCRIPTION

[0020] The following is a description of exemplary embodiments of the present application in conjunction with the accompanying drawings, including various details of the embodiments of the present application to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. Similarly, for the sake of clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0021] It should be noted that the terms "first", "second", etc. in the present invention are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure.

[0022] In addition, the term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article, unless otherwise specified, generally means that the associated objects before and after are in an "or" relationship.

[0023] A thermal insulation pad for a lithium battery pack of the present application is described below with reference to the accompanying drawings.

[0024] like Figure 1 and Figure 2 As shown, the thermal insulation pad for lithium battery pack includes a thermal insulation pad body 1, which includes a first phase change heat absorption layer 2, a first skeleton 3, an aerogel insulation layer 4, a second skeleton 5 and a second phase change heat absorption layer 6 from top to bottom, the first phase change heat absorption layer 2 and the second phase change heat absorption layer 6 are both made of polyethylene fiber substrate, the first phase change heat absorption layer 2 and the second phase change heat absorption layer 6 are both coated with nano metal oxides with heat storage capacity, the first skeleton 3 and the second skeleton 5 are made of nano hollow microbeads, the polyethylene fiber substrate is used as the basic material, and a plurality of nano metal oxides with heat storage capacity are uniformly coated on one side of the polyethylene fiber substrate by a coating method to increase the heat absorption capacity of the polyethylene fiber substrate and improve its thermal conductivity to form a phase change heat absorption layer, so that when the battery 7 contacts the thermal insulation pad, the first phase change heat absorption layer 2 or the second phase change heat absorption layer 6 located on the outside The thermal layer 6 can quickly absorb heat and quickly dissipate heat. Nano hollow microbeads are used as the first skeleton 3 or the second skeleton 5. The nano hollow microbeads have low thermal conductivity, and their hollow structure can effectively prevent heat conduction, significantly reduce heat transfer, and prevent the spread of open flames. At the same time, the nano hollow microbeads can quickly return to their original state after being expanded and compressed by the battery 7, and have good compression performance and stability. At the same time, the support inside the thermal insulation pad is enhanced, and the extremely low thermal conductivity of the aerogel insulation layer 4 itself is used to set the aerogel insulation layer 4 between the first phase change heat absorption layer 2 and the second phase change heat absorption layer 6 to block the heat transfer of the batteries 7 on both sides of the thermal insulation pad, thereby improving the safety factor of the lithium battery pack. The above five layers complement each other and are symmetrically arranged. The structural design can enable the thermal insulation pad to meet the use requirements of high-safety lithium battery packs while improving the thermal insulation effect.

[0025] It should be noted that the polyethylene fiber substrate is a synthetic fiber made of polyethylene, which has good chemical resistance, wear resistance and excellent electrical insulation performance, so as to be suitable for the working conditions of the lithium battery pack. It is used as the basic material of the first phase change heat absorption layer 2 and the second phase change heat absorption layer 6, which can significantly improve the safety factor of the lithium battery pack, and at the same time improve the strength and wear resistance of the phase change heat absorption layer. The nano metal oxide with heat storage capacity is evenly coated on one side of the polyethylene fiber substrate by coating to affect the thermal effect and thermal conductivity of the polyethylene fiber to form a phase change heat absorption layer that can quickly absorb heat, so as to achieve the effect of absorbing the heat of the battery 7 on one side. Among them, the nano metal oxide with heat storage capacity can be selected from nano phase change materials. Nano phase change materials are materials that can undergo phase change (transition between liquid and solid) within a specific temperature range. These materials can absorb or release a large amount of heat during the phase change process to achieve the storage and release of thermal energy. The nano metal oxides selected in this embodiment include nano titanium dioxide and nano antimony tin oxide.

[0026] Furthermore, the first phase change heat absorption layer 2, the first skeleton 3, the aerogel insulation layer 4, the second skeleton 5 and the second phase change heat absorption layer 6 are bonded and fixed by coating and pressing. The coating and pressing method can ensure uniform bonding between the layers, can be applicable to bonding between layers of different materials, and can achieve lightweight design of the insulation pad, reduce additional burden and weight, and simplify the production process.

[0027] Furthermore, adhesive layers 8 are provided on the outside of the first phase change heat absorption layer 2 and the outside of the second phase change heat absorption layer 6, so that the heat insulation pad can be attached between the two batteries 7 by bonding to complete the heat insulation assembly of the lithium battery pack.

[0028] It should be noted that the thermal insulation pad may not be provided with the adhesive layer 8, and the thermal insulation pad may be directly attached between the two batteries 7, and the technicians may make the choice according to the actual situation.

[0029] In addition, in this embodiment, the aerogel insulation layer 4 is prepared by mixing aerogel particles and an adhesive. The aerogel particles and the adhesive are mixed to form a uniform coating, which can play a role of thermal insulation and is elastic. By applying it to the skeleton multiple times, the elasticity of the insulation pad is improved, and the compression performance of the insulation pad is further improved.

[0030] The above specific implementations do not constitute a limitation on the protection scope of this application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this application should be included in the protection scope of this application.

Claims

1. A thermal insulation pad for a lithium battery pack, characterized in that: include: A thermal insulation pad body (1), the thermal insulation pad body (1) comprising, from top to bottom, a first phase change heat absorption layer (2), a first skeleton (3), an aerogel heat insulation layer (4), a second skeleton (5) and a second phase change heat absorption layer (6), the first phase change heat absorption layer (2) and the second phase change heat absorption layer (6) both use a polyethylene fiber substrate, the first phase change heat absorption layer (2) and the second phase change heat absorption layer (6) are both coated with nano metal oxides having heat storage capacity, and the first skeleton (3) and the second skeleton (5) are made of nano hollow microspheres.

2. A thermal insulation pad for a lithium battery pack as claimed in claim 1, characterized in that: The first phase-change heat absorption layer (2), the first skeleton (3), the aerogel heat insulation layer (4), the second skeleton (5) and the second phase-change heat absorption layer (6) are bonded and fixed by coating and pressing.

3. A thermal insulation pad for a lithium battery pack as claimed in claim 1, characterized in that: An adhesive layer (8) is provided on the outside of the first phase-change heat absorption layer (2) and the outside of the second phase-change heat absorption layer (6).

4. A thermal insulation pad for a lithium battery pack as claimed in claim 1, characterized in that: The aerogel heat insulation layer (4) is prepared by mixing aerogel particles and an adhesive.

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