Heat preservation structure, battery pack and electric equipment

Abstract

The utility model provides a heat preservation structure which comprises a heat preservation assembly, the heat preservation assembly comprises a heat preservation layer, a first heat preservation layer arranged close to a battery pack box body and a second heat preservation layer arranged away from the battery pack box body in the thickness direction of the heat preservation structure, the corresponding compression strength of the first heat preservation layer under the same deformation quantity is smaller than the corresponding compression strength of the second heat preservation layer under the same deformation quantity. According to the heat preservation structure, the heat preservation function is achieved through the first heat preservation layer, energy of external impact is absorbed through the second heat preservation layer with high compression stress, and the mechanical protection effect on the battery pack is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy, and in particular to a thermal insulation structure, a battery pack and electrical equipment. Background Art

[0002] In the related art, thermal insulation cotton is often set on the top or bottom of the battery pack. This thermal insulation structure can only achieve heat preservation and noise absorption, and its ability to resist external impact is poor. In addition, the thermal insulation cotton is usually made of polyurethane, polyethylene, polypropylene, EPDM rubber, etc., which has a certain water absorption rate. Therefore, during the use of the battery pack, the thermal insulation cotton is easy to fail. Utility Model Content

[0003] In view of the weak impact resistance of existing thermal insulation structures, the present application provides a thermal insulation structure and a battery pack.

[0004] The thermal insulation structure includes: a thermal insulation component; the thermal insulation component includes: an insulation layer; wherein, along the thickness direction of the thermal insulation structure, there is a first thermal insulation layer arranged close to the battery pack and a second thermal insulation layer arranged away from the battery pack, wherein the compression strength corresponding to the first thermal insulation layer under the same deformation amount is less than the compression strength corresponding to the second thermal insulation layer under the same deformation amount.

[0005] Furthermore, the thermal insulation component also includes: a first waterproof membrane, the thermal insulation layer and a second waterproof membrane stacked in sequence.

[0006] Furthermore, the first waterproof membrane and the second waterproof membrane are arranged to form a containing cavity, and the thermal insulation layer is arranged in the containing cavity.

[0007] Furthermore, a ventilation valve is provided on one side of the thermal insulation component; and a mounting hole is provided on the first waterproof membrane, and the mounting hole is used to set the ventilation valve.

[0008] Furthermore, a protective cover is provided on the air-permeable valve.

[0009] Furthermore, the thermal conductivity of the thermal insulation layer is lower than 0.05 W / m·K.

[0010] Furthermore, the compressive strength of the first thermal insulation layer at a deformation amount of 50% is less than or equal to 40 kPa;

[0011] The compressive strength of the second thermal insulation layer under a deformation amount of 50% is greater than or equal to 0.8 MPa.

[0012] Furthermore, the thickness of the second thermal insulation layer is greater than or equal to 5 mm.

[0013] Furthermore, the thickness of the thermal insulation structure is 8 mm to 24 mm.

[0014] Furthermore, an adhesive layer is provided on the other side of the thermal insulation component, and the thermal insulation structure is mounted to the battery pack through the adhesive layer.

[0015] The present application also provides a battery pack, comprising: a plurality of battery cells, a box for accommodating the battery cells, and the above-mentioned heat preservation structure, wherein the heat preservation structure is used to keep the battery pack warm.

[0016] Furthermore, the battery pack further includes: a bottom plate; the box body further includes: a tray; and the heat preservation structure is arranged between the tray and the bottom plate.

[0017] The present application also provides an electrical device, comprising the above-mentioned battery pack.

[0018] The present application provides a thermal insulation structure, including a thermal insulation component, which includes a thermal insulation layer, wherein along the thickness direction of the thermal insulation structure, there is a first thermal insulation layer arranged close to a battery pack body and a second thermal insulation layer arranged away from the battery pack body, wherein the compression strength corresponding to the first thermal insulation layer under the same deformation amount is less than the compression strength corresponding to the second thermal insulation layer under the same deformation amount.

[0019] The thermal insulation structure provided in the present application realizes the thermal insulation function through the first thermal insulation layer, and absorbs the energy of external impact through the second thermal insulation layer with high compressive stress, thereby providing mechanical protection for the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A cross-sectional view of an embodiment of the thermal insulation structure provided in this application

[0021] Figure 2 An exploded view of another embodiment of the thermal insulation structure provided by the present application;

[0022] Figure 3 A cross-sectional view of another embodiment of the thermal insulation structure provided by the present application;

[0023] Figure 4 for Figure 2 A cross-sectional view of the first waterproof membrane, the second waterproof membrane and the thermal insulation layer when they are assembled together.

[0024] In the figure: 100 insulation structure; 200 insulation component; 1 first waterproof membrane, 11 accommodating cavity, 12 mounting hole; 2 insulation layer, 21 first insulation layer, 22 second insulation layer; 3 second waterproof membrane; 4 breathable valve, 41 adhesive part, 42 breathable part; 5 protective cover; 6 adhesive layer. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0026] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.

[0027] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this application and in the specification are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this application includes any and all combinations of one or more of the related listed items.

[0028] In the related art, thermal insulation cotton is often set on the top or bottom of the battery pack. This thermal insulation structure can only achieve heat preservation and noise absorption, and its ability to resist external impact is poor. In addition, the thermal insulation cotton is usually waterproofed by closed-cell foaming and surface crusting. However, due to its own material, the closed-cell rate of the thermal insulation cotton is low and its waterproof performance is poor. Therefore, during the use of the battery pack, the thermal insulation cotton is prone to failure.

[0029] To solve the above problems, the present application proposes an electric device, which can be a vehicle, a photovoltaic device, or a household energy storage device, and the present application does not limit this. The electric device includes a frame and a battery pack. The frame serves as the skeleton of the electric device and is used to connect and support the components of the electric device. The frame is provided with an installation cavity, and the battery pack is arranged in the installation cavity. The battery pack is used to provide power for the normal use of the electric device.

[0030] The battery pack includes a box, multiple battery cells and a heat preservation structure. The box is used as the skeleton of the battery pack to support and connect the components of the battery pack. The box shape can be square, rectangular, or other regular or irregular shapes, which is not limited in this application. The box material can be plastic, metal, or other materials with a supporting effect, which is not limited in this application. The box is formed with a battery compartment, and multiple battery cells are arranged in the battery compartment. The multiple battery cells are used to store electricity and transmit electricity to the outside when the electrical equipment needs power. The heat preservation structure is arranged on the outer wall of the battery box, and the heat preservation cotton can be wrapped outside the battery box or only cover one side of the battery box, which is not limited in this application. More specifically, the battery box can include a tray, and the heat preservation structure can be arranged between the tray and the bottom plate of the battery pack. Similarly, the battery box can include an upper cover, and the heat preservation structure can be arranged between the upper cover and the top plate of the battery pack. This application is not limited in this.

[0031] See also Figure 1 The insulation structure includes an insulation component, and the insulation component 200 includes an insulation layer 2, wherein, along the thickness direction of the insulation structure, there is a first insulation layer 21 arranged close to the battery pack body and a second insulation layer 22 arranged away from the battery pack body, wherein the compression strength corresponding to the first insulation layer 21 under the same deformation amount is less than the compression strength corresponding to the second insulation layer 22 under the same deformation amount.

[0032] Therefore, the first thermal insulation layer realizes the thermal insulation function, and the second thermal insulation layer with high compressive stress absorbs the energy of external impact, thereby providing mechanical protection for the battery pack.

[0033] It can be understood that the first insulation layer 21 arranged close to the battery pack can keep the battery pack warm; because the compression strength corresponding to the first insulation layer 21 under the same deformation amount is less than the compression strength corresponding to the second insulation layer 22 under the same deformation amount, that is, when subjected to the same impact conditions, the deformation amount generated by the second insulation layer 22 will be less than the deformation amount generated by the first insulation layer. When the battery pack is subjected to external impact, the second insulation layer 22 arranged far away from the battery pack is impacted first, and the second insulation layer 22 can absorb the external impact energy and protect the battery pack; that is, the setting of two insulation layers can enhance the impact resistance of the insulation structure and achieve more comprehensive protection for the battery pack.

[0034] In the technical solution of this application, see Figure 2 and Figure 3 The insulation component also includes a first waterproof membrane 1, an insulation layer 2 and a second waterproof membrane 3 stacked in sequence, that is, the first waterproof membrane 1 and the second waterproof membrane 3 with low water absorption are arranged on both sides of the insulation layer 2. In this way, the insulation layer 2 is protected by the waterproof membrane to reduce the water absorption rate of the insulation component, improve the waterproof performance of the insulation component 200, avoid failure of the insulation structure, and improve the stability of the insulation structure.

[0035] Therefore, the thermal insulation structure provided by the present application realizes the thermal insulation function through the first thermal insulation layer, and absorbs the energy of external impact through the second thermal insulation layer with high compressive stress, thereby providing mechanical protection for the battery pack. At the same time, a waterproof film is used to protect the two thermal insulation layers, thereby preventing the thermal insulation structure from failing and extending the service life of the thermal insulation structure.

[0036] In some embodiments, the waterproof film may be an aluminum-plastic film, a polyethylene film, or a polypropylene film, which is not limited in the present application.

[0037] In one embodiment of the present application, see Figure 2 and Figure 4 The first waterproof membrane 1 is formed with a first receiving groove, and the second waterproof membrane 3 is formed with a second receiving groove. The first waterproof membrane 1 can be formed into the first receiving groove by stamping, or by mold casting, and the present application does not limit this. The second waterproof membrane 3 can be formed into the second receiving groove by stamping, or by mold casting, and the present application does not limit this. The first receiving groove and the second receiving groove are mutually surrounded to form a receiving cavity 11, and the thermal insulation layer 2 is heat-sealed in the receiving cavity 11. In this way, the first waterproof membrane 1 and the second waterproof membrane 3 are completely wrapped around the outside of the thermal insulation layer 2, thereby reducing the possibility of external water vapor entering the thermal insulation layer 2 and improving the waterproofness of the thermal insulation cotton 100.

[0038] In one embodiment of the present application, see Figure 2-4 The insulation component is provided with a breathable valve 4, and the first waterproof membrane 1 is provided with a mounting hole 12 for setting the breathable valve 4. The insulation component mounting hole 12 can be circular, square, or other regular or irregular shapes. In this embodiment, the mounting hole 12 is a square hole of 20 mm×20 mm. The mounting hole 12 is connected to the accommodating cavity 11. In this way, when the insulation component 200 needs to be compressed, the gas in the accommodating cavity 11 can be discharged outward through the breathable valve 4, thereby reducing the volume of the insulation component 200 and facilitating the installation of the insulation structure.

[0039] The breathable valve 4 includes an adhesive portion 41 and a breathable portion 42. The adhesive portion 41 is arranged around the outer edge of the breathable portion 4. The adhesive portion 41 is provided with adhesive. The breathable valve 4 is bonded to the first waterproof membrane 1 through the adhesive portion. The breathable portion 42 is covered on the mounting hole 12, and gas can be released through the breathable portion 42. Water vapor outside the atmosphere cannot enter the breathable hole 12 through the breathable portion 42, so as to prevent external water vapor from entering the accommodating chamber 11 from the breathable hole 12, thereby improving the waterproof ability of the thermal insulation component 200. The breathable valve 4 can be a structure that can pass water vapor in one direction. In this embodiment, the breathable valve is a waterproof breathable membrane, and the air permeability of the waterproof breathable membrane is greater than or equal to 2000ml / min·cm2 under a pressure of 7kpa, and the water resistance level meets the IP 67 standard.

[0040] The breathable valve 4 is also provided with a protective cover 5, and the shape of the protective cover 5 can be a cylinder, a hemisphere, or other regular or irregular shapes, which is not limited in this application. The protective cover 5 is covered on the breathable valve 4, so as to provide protection for the breathable valve 4, reduce the possibility of damage to the breathable valve 4 during assembly, transportation or use, and improve the reliability of the thermal insulation structure 100. The surface of the protective cover 5 can also be provided with a plurality of micropores for smooth passage of gas. The material of the protective cover 5 can be rubber, metal, plastic, or other materials with supporting and protective effects, which is not limited in this application.

[0041] The thermal insulation layer 2 is used to reduce the heat exchange between the battery pack and the outside world, so as to reduce the impact of the external low temperature on the battery pack.

[0042] The thermal conductivity of the insulation layer 2 may be lower than 0.05 W / m·K. It is understandable that the thermal conductivity of the first insulation layer 21 and the second insulation layer 22 are both lower than 0.05 W / m·K, thereby achieving thermal insulation of the battery pack.

[0043] In this embodiment, the compressive strength corresponding to the first insulation layer 21 at a deformation of 50% can be less than or equal to 40 kPa; the compressive strength corresponding to the second insulation layer 22 at a deformation of 50% can be greater than or equal to 0.8 MPa. Under the same deformation, the compressive strength corresponding to the first insulation layer 21 is much smaller than the compressive strength corresponding to the second insulation layer 22, so that the second insulation layer 22 can absorb most of the external impact energy compared to the first insulation layer 21.

[0044] In some embodiments, the material of the first insulation layer 21 includes but is not limited to polyurethane, polyethylene, polypropylene, EPDM rubber, etc.; in this embodiment, it is a soft polyurethane board (PU). After testing, the compression strength of the soft polyurethane board at a deformation of 30% is less than or equal to 10kPa, which meets the requirements of the insulation structure 100.

[0045] The material types of the second insulation layer 22 include but are not limited to polyurethane, polyethylene, polypropylene, EPDM rubber, etc. In the case described, it is a microporous foamed polypropylene board (MPP). After testing, the microporous foamed polypropylene board has a corresponding compression strength of greater than or equal to 0.5 MPa under a deformation of 10%, which meets the requirements of the insulation structure 100.

[0046] In some embodiments, the thickness of the second thermal insulation layer 22 is greater than or equal to 5 mm to absorb external impact. In this embodiment, the second thermal insulation layer 22 is 8 mm to meet the impact resistance requirements.

[0047] The thickness of the first thermal insulation layer 21 after installation is 20% to 50% of the thickness of the first thermal insulation layer before installation, that is, the first thermal insulation layer is compressed by 50-80%.

[0048] The insulation structure 100 may have a thickness between 8 mm and 24 mm to achieve insulation and protection of the battery pack. After the insulation structure is installed in the battery pack, the thickness of the insulation structure is 40% to 80% of the thickness before installation. That is, the overall compression degree of the insulation structure 100 is between 20% and 60%, preferably about 40%.

[0049] In this embodiment, the thickness of the heat preservation structure 100 before installation is 20 mm, and the thickness of the heat preservation structure 100 after being compressed between the bottom plate and the battery tray and installed is about 13 mm.

[0050] See also Figure 3 , along the thickness direction of the insulation structure, an adhesive layer 6 is provided on the other side of the insulation component 200, and the insulation structure 100 is mounted to the battery pack through the adhesive layer. In some embodiments, an adhesive layer can be provided on the side of the second waterproof membrane away from the breathable valve for bonding with external structural parts such as the battery pack tray. The adhesive layer can be made of double-sided tape, and the types of double-sided tape include but are not limited to double-sided tape without substrate, double-sided tape with cotton paper substrate, double-sided tape with PET substrate, etc. In this embodiment, double-sided tape with cotton paper substrate is used.

[0051] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship described in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0052] What is disclosed above is only a preferred embodiment of the present application, and it certainly cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiment and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A heat preservation structure, applied to a battery pack, characterized in that: include: Insulation components; The thermal insulation component comprises: a thermal insulation layer; wherein, Along the thickness direction of the thermal insulation structure, there is a first thermal insulation layer arranged close to the battery pack and a second thermal insulation layer arranged away from the battery pack, wherein the compression strength corresponding to the first thermal insulation layer under the same deformation amount is less than the compression strength corresponding to the second thermal insulation layer under the same deformation amount.

2. The thermal insulation structure according to claim 1, characterized in that: The thermal insulation component further comprises: a first waterproof membrane, the thermal insulation layer and a second waterproof membrane which are stacked in sequence.

3. The thermal insulation structure according to claim 2, characterized in that: The first waterproof membrane and the second waterproof membrane are arranged to form a containing cavity, and the heat-insulating layer is arranged in the containing cavity.

4. The thermal insulation structure according to claim 2, characterized in that: A ventilation valve is provided on one side of the thermal insulation component; The first waterproof membrane is provided with a mounting hole, and the mounting hole is used for arranging the air-permeable valve.

5. The thermal insulation structure according to claim 4, characterized in that: A protective cover is sleeved on the air-permeable valve.

6. The thermal insulation structure according to claim 1, characterized in that: The thermal conductivity of the thermal insulation layer is lower than 0.05 W / m·K.

7. The thermal insulation structure according to claim 2, characterized in that: The compressive strength of the first thermal insulation layer at a deformation amount of 50% is less than or equal to 40 kPa; The compressive strength of the second thermal insulation layer under a deformation amount of 50% is greater than or equal to 0.8 MPa.

8. The thermal insulation structure according to claim 1, characterized in that: The thickness of the second thermal insulation layer is greater than or equal to 5 mm.

9. The thermal insulation structure according to claim 1, characterized in that: The thickness of the thermal insulation structure is 8 mm to 24 mm.

10. The thermal insulation structure according to claim 4, characterized in that: An adhesive layer is provided on the other side of the thermal insulation component, and the thermal insulation structure is mounted to the battery pack through the adhesive layer.

11. A battery pack, characterized in that: include: A plurality of battery cells, a box for accommodating the battery cells, and a thermal insulation structure as claimed in any one of claims 1 to 10, wherein the thermal insulation structure is used to keep a battery pack warm.

12. The battery pack according to claim 11, characterized in that: The battery pack further includes: a bottom plate; the box further includes: a tray; The heat-insulating structure is arranged between the tray and the bottom plate.

13. An electrical equipment, characterized in that: Comprising a battery pack as claimed in claim 11 or 12.

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