CN220021310U - Structural component for battery pack, battery pack and vehicle - Google Patents

Abstract

The present utility model provides a structural assembly for a battery pack, comprising: a case adapted to house a battery; the heat preservation piece, the heat preservation piece sets up the top and/or the bottom of box, the heat preservation piece has porous structure, just the obturator rate of heat preservation piece is greater than 80%. According to the utility model, water at the heat preservation part can be rapidly discharged, so that the water is prevented from staying in the heat preservation part for a long time, and when the battery pack is used, the battery pack can be prevented from being in a moist environment for a long time, and the reliability and the safety of the battery pack under the working conditions of wading or splashing by water and the like are improved. The utility model also provides a battery pack comprising the structural component and a vehicle comprising the battery pack.

Description

Structural component for battery pack, battery pack and vehicle

Technical Field

The utility model relates to the field of batteries, in particular to a structural component for a battery pack, the battery pack and a vehicle.

Background

The battery package generally uses metal tray and the sealed lid of macromolecular material, and metal tray and the sealed lid of macromolecular material own heat preservation effect is not good, need through setting up the heat preservation cotton in order to guarantee the inside heat stability of battery package in tray bottom and/or sealed covering. However, because the battery pack has wading or water splashing and other working conditions when in use, the waterproof performance of the battery pack needs to be correspondingly optimized. The heat preservation cotton in the related art only considers the heat preservation effect, and the waterproof performance of the heat preservation cotton is not considered, so that the overall waterproof performance of the battery pack is not high.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, a first object of the present utility model is to provide a structural assembly for a battery pack, which can effectively improve the waterproof property of the battery pack when it is used for the battery pack.

A second object of the present utility model is to provide a battery pack including the above structural assembly for a battery pack.

A third object of the present utility model is to provide a vehicle including the above battery pack.

A structural assembly for a battery pack according to an embodiment of the first aspect of the present utility model includes:

a case adapted to house a battery;

the first heat preservation layer is arranged at the top of the box body, the first heat preservation layer has a porous structure, and the closed pore rate of the first heat preservation layer is more than 80%; the second heat preservation set up in the box bottom, the second heat preservation has porous structure, the obturator rate of second heat preservation is greater than 80%.

According to the structural component for the battery pack, disclosed by the embodiment of the utility model, the closed hole rate of the heat preservation layer with the porous structure is controlled to be more than 80%, so that water at the heat preservation layer can be rapidly discharged, the water is prevented from staying in the heat preservation layer for a long time, the battery pack can be prevented from being in a moist environment for a long time when the structural component is used for the battery pack, and the reliability and the safety of the battery pack under the working conditions of wading or being splashed by water and the like are improved.

A battery pack according to an embodiment of the second aspect of the present utility model includes the structural assembly for a battery pack according to the above-described first aspect of the present utility model.

A vehicle according to an embodiment of a third aspect of the present utility model includes a battery pack according to the above-described embodiment of the second aspect of the present utility model.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic view of a battery pack according to some embodiments of the present utility model;

fig. 2 is an exploded view of a battery pack according to some embodiments of the present utility model;

FIG. 3 is a top view of a first insulation layer according to some embodiments of the utility model;

FIG. 4 is an exploded view of a partial structure of a battery pack according to some embodiments of the present utility model after the battery pack is inverted from top to bottom;

fig. 5 is a schematic view of a third thermal insulation layer and a fourth thermal insulation layer in a battery pack according to some embodiments of the utility model.

Reference numerals:

100. a battery pack;

10. a case;

20. a thermal insulation member; 21. a first heat-retaining layer; 22. a second heat-insulating layer; 23. a third heat-insulating layer; 24. a fourth heat-insulating layer; 25. avoidance holes;

30. sealing cover;

40. a tray; 41. edge beams; 42. a bottom plate; 43. a protruding portion; 44. a bottom guard board; 45. a reinforcing member; 46. an opening.

Detailed Description

Embodiments of the present utility model will be described in detail below, with reference to the accompanying drawings, which are exemplary.

In the description of the utility model, a "first feature" or "second feature" may include one or more of such features.

In the description of the present utility model, "plurality" means two or more.

In the description of the utility model, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by another feature therebetween.

In the description of the utility model, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature.

The structural assembly for the battery pack 100 according to the embodiment of the present utility model is described below with reference to fig. 1 to 4.

In the related art, a battery pack usually uses a metal tray and a high polymer material sealing cover, the metal tray and the high polymer material sealing cover have poor heat insulation effect, and heat insulation cotton needs to be arranged at the bottom of the tray and/or on the sealing cover to ensure the stability of the heat inside the battery pack. The heat preservation cotton adopts porous structure generally to guarantee its thermal insulation performance, however, because the battery package can exist wading or by operating mode such as water splash when using, the porous structure of heat preservation cotton makes the battery package be in moist environment for a long time in the easy ponding of operating mode such as wading or by water splash, makes the reliability and the security of battery package under operating mode such as wading or by water splash reduce.

In order to solve the above problems, an embodiment of the present utility model provides a structural assembly for a battery pack 100, and in particular, as shown in fig. 1 to 4, in the battery pack 100, the structural assembly for the battery pack 100 includes: a case 10, the case 10 being adapted to accommodate a battery; and a heat insulating member 20, wherein the heat insulating member 20 is arranged at the top and/or bottom of the case 10, and the heat insulating member 20 has a porous structure. Specifically, the thermal insulation member 20 includes a first thermal insulation layer 21 and/or a second thermal insulation layer 22; the first heat preservation layer 21 is arranged at the top of the box body 10, the first heat preservation layer 21 has a porous structure, and the closed pore rate of the first heat preservation layer 21 is more than 80%; the second heat-insulating layer 22 is arranged at the bottom of the box body 10, the second heat-insulating layer 22 has a porous structure, and the closed pore rate of the second heat-insulating layer 22 is more than 80%.

In the embodiment of the present utility model, the form of the case 10 may not be specifically limited, for example, the case 10 may include a tray 40 and a sealing cover 30, where the tray 40 and the sealing cover 30 enclose a receiving cavity suitable for receiving a battery, and in this case, "the heat insulating member 20 is disposed at the top and/or bottom of the case 10" means that the heat insulating member 20 is disposed at the sealing cover 30 and/or the bottom plate of the tray 40; in addition to the above configuration, the case may be of other configurations, for example, the case may include a case and a side cover that are open on the sides, and the case and the side cover are enclosed to form a housing chamber adapted to house the battery.

In the embodiments of the present utility model, "top" and "bottom" are described based on the common placement orientations of the structural components of the battery pack 100 described above. For example, the power battery pack is often provided at the bottom of a vehicle, and when the structural components of the battery pack 100 described above are used for the battery pack 100, and the battery pack 100 is provided at the bottom of the vehicle, the battery pack 100 has "top" and "bottom" in the vehicle height direction.

In the embodiment of the present utility model, the heat-insulating member 20 is disposed at the top and/or the bottom of the box 10, that is, the top of the box 10 is provided with the heat-insulating member 20, or the bottom of the box 10 is provided with the heat-insulating member 20, or the top and the bottom of the box 10 are respectively provided with the heat-insulating member 20.

In the embodiment of the present utility model, the heat insulating member 20 includes a first heat insulating layer 21 and/or a second heat insulating layer 22; the first heat preservation layer 21 is arranged at the top of the box body 10, the first heat preservation layer 21 has a porous structure, and the closed pore rate of the first heat preservation layer 21 is more than 80%; the second heat-insulating layer 22 is arranged at the bottom of the box body 10, the second heat-insulating layer 22 has a porous structure, and the closed pore rate of the second heat-insulating layer 22 is more than 80%. That is, the structural assembly for the battery pack satisfies any one of the following conditions:

(1) The heat preservation piece 20 only comprises a first heat preservation layer 21, the first heat preservation layer 21 is arranged at the top of the box body 10, the first heat preservation layer 21 has a porous structure, and the closed pore rate of the first heat preservation layer 21 is more than 80%;

(2) The heat preservation piece 20 only comprises a second heat preservation layer 22, the second heat preservation layer 22 is arranged at the bottom of the box body 10, the second heat preservation layer 22 is of a porous structure, and the closed pore rate of the second heat preservation layer 22 is more than 80%; or (b)

(3) The heat preservation piece 20 includes first heat preservation layer 21 and second heat preservation layer 22, and first heat preservation layer 21 sets up in box 10 top, and first heat preservation layer 21 has porous structure, and the obturator rate of first heat preservation layer 21 is greater than 80%, and second heat preservation layer 22 sets up in box 10 bottom, and second heat preservation layer 22 has porous structure, and the obturator rate of second heat preservation layer 22 is greater than 80%.

In the embodiment of the present utility model, the heat insulating member 20 has a porous structure, and for example, the heat insulating member 20 may be a foam board. The closed pore rate of the heat preservation member 20 being greater than 80% means that most of the pores in the heat preservation member 20 are closed pores and are not communicated with the outside, so that water splashed or permeated around the heat preservation member 20 is difficult to enter the pores inside the heat preservation member 20, water accumulation inside the heat preservation member 20 is avoided, and the water repellency of the heat preservation member 20 is improved.

When the battery pack is provided on a vehicle, for example, the battery pack is provided at the bottom of the vehicle, the heat insulating member 20 at the top of the case 10 is generally horizontally stuck, and if the vehicle is waded or splashed with water, the water at the top of the case 10 cannot be rapidly discharged, and remains on the surface of the heat insulating member 20; the thermal insulation 20 at the bottom of the case 10 is also typically horizontally affixed, and the bottom of a battery pack placed at the bottom of the vehicle typically has a bottom guard 44, and if the vehicle is wading or is subject to water splashing, water is likely to enter between the thermal insulation 20 and the bottom guard 44. According to the structural component for the battery pack 100, disclosed by the embodiment of the utility model, water at the heat preservation part 20 can be rapidly discharged, so that the water is prevented from staying in the heat preservation part 20 for a long time, the battery pack 100 is prevented from being in a moist environment for a long time, and the reliability and the safety of the battery pack 100 under the working conditions of wading or splashing by water are improved.

In the embodiment of the utility model, the method for testing the closed cell rate is carried out by referring to 'GB/T10799-2008 determination of open cell and closed cell volume percentage' of rigid foam.

According to some embodiments of the utility model, the thermal conductivity of the thermal insulation 20 is less than or equal to 0.06W/(m.k). The thermal conductivity of the heat preservation piece 20 is less than or equal to 0.06W/(m.K), so that the heat preservation piece 20 has a good heat preservation effect, the internal temperature of the battery pack 100 is prevented from being influenced by the external environment temperature, and the internal heat stability of the battery pack 100 is ensured.

In the embodiment of the utility model, the thermal conductivity test method is carried out by referring to GB/T10294-2008 heat insulation material steady state thermal resistance and related characteristic measurement protection hot plate method.

According to some embodiments of the present utility model, the thermal insulation member 20 includes a first thermal insulation layer 21, and the first thermal insulation layer 21 is disposed on top of the case 10. In this manner, when the structural assembly is used for the battery pack 100, the heat-insulating capability of the battery pack 100 can be improved at the top of the case 10. According to some embodiments of the present utility model, the thermal insulation member 20 may be adhered to the top of the case 10 in the form of a back adhesive; according to some embodiments of the present utility model, the thermal insulation member 20 may be provided with a clearance hole to avoid the problem of interference with the removal of the bolts of the battery pack 100.

According to some embodiments of the utility model, the tank 10 is adapted to be arranged at the bottom of the vehicle, and the first thermal insulation layer 21 is arranged between the body of the vehicle and said tank 10 when said tank 10 is arranged at the bottom of the vehicle. At this time, the first heat-insulating layer 21 can play a role in heat insulation between the vehicle body and the case 10 of the battery pack 100, and prevent the battery pack 100 from affecting the ambient temperature of the vehicle body interior space such as the passenger compartment while ensuring the stability of the heat inside the battery pack 100. The vehicle may be a pure electric vehicle or a hybrid electric vehicle.

According to some embodiments of the utility model, the first insulating layer 21 has a hydrophobicity of 97% or more. In this manner, when the structural assembly is used for the battery pack 100, the reliability and safety of the battery pack 100 can be further improved.

In the embodiment of the utility model, the test of the hydrophobicity is referred to GB/T10299-2011 test method of hydrophobicity of heat insulation materials.

According to some embodiments of the present utility model, the flame retardant rating of the first insulation layer 21 meets UL 94V 0 rating. Flame retardant test methods were performed with reference to UL94 horizontal burn test methods. The flame retardant rating of the first heat preservation layer 21 satisfies the UL 94V 0 rating, which means that the first heat preservation layer 21 has better heat preservation performance and hydrophobic performance and also has better flame retardant performance, and when the structural component is used for the battery pack 100, and the battery pack 100 is mounted at the bottom of a vehicle, the flame retardant can be effectively performed between the vehicle body and the battery pack 100, thereby improving the overall safety of the vehicle.

According to some embodiments of the utility model, the first insulation layer has a 20% deformation corresponding compressive stress of 70kPa or less. Thus, the first heat-preserving layer 21 has a certain buffering and energy absorbing capacity, and when the structural component is used for the battery pack 100, and the battery pack 100 is mounted at the bottom of a vehicle, the first heat-preserving layer 21 can play a role in buffering between the vehicle body and the main body of the battery pack 100, so that the safety and the reliability of the battery pack 100 are improved, and the overall safety and the reliability of the vehicle are improved. In the embodiment of the utility model, the test standard of compressive stress is carried out by referring to 'GB/T8813-2020 determination of compressive property of rigid foam plastics'. Specifically, the testing method of the compressive stress corresponding to 20% deformation of the first heat preservation layer comprises the steps of taking the size (50+/-1) mm (20+/-1) mm of a sample, and calibrating the size according to the specification of GB/T6342-1996 linear size measurement of foamed plastics and rubber; placing the sample in the center of two flat plates of a compression tester, compressing the sample at a rate of 10% of the initial thickness per minute until 80% of the sample is compressed; the force-displacement curve was recorded at the time of measurement, and the 20% compression strength was calibrated. The number of samples was at least 5PCS.

According to some embodiments of the utility model, the thickness of the first insulating layer 21 is 5mm to 15mm. It will be appreciated that the thickness of the first thermal barrier layer 21 need not be uniform, and may be thicker in some locations and thinner in other locations. The thickness of the first heat-insulating layer 21 is in the range of 5mm to 15mm, when the structural component is used for the battery pack 100, the occupation of the space of the battery pack 100 can be reduced while the heat-insulating performance is ensured, and when the battery pack 100 is installed at the bottom of a vehicle, the ground clearance of the battery pack 100 is increased. It should be noted that, the first heat-preserving layer 21 may be provided with a hole at a local position to avoid the problem of disassembling and interfering the bolts of the battery pack 100 and a label is provided, and the thickness of the first heat-preserving layer 21 at the hole is zero, but this should not be construed as contradicting the thickness of the first heat-preserving layer 21 in the range of 5mm to 15mm.

According to some embodiments of the utility model, the first insulation layer 21 comprises a foamed rubber sheet; the foaming rubber plate has good heat preservation property and certain elasticity, and can play a role in buffering between the vehicle body and the main body of the battery pack 100; according to some embodiments of the utility model, the first insulation layer 21 comprises an Ethylene Propylene Diene Monomer (EPDM) foam board. The EPDM foaming plate has good heat preservation and flame retardance, and has certain compression deformation/rebound quantity, so that a buffer effect can be achieved between a vehicle body and a main body of the battery pack 100, the safety and reliability of the battery pack 100 are improved, and the overall safety and reliability of a vehicle are improved. According to some embodiments of the utility model, the first insulation layer 21 is an Ethylene Propylene Diene Monomer (EPDM) foam board.

According to some embodiments of the present utility model, in the structural component of the battery pack 100, the first insulation layer 21 is made of closed-cell foam insulation cotton (EPDM) with a thickness of 5 mm-15 mm, and has a thermal conductivity of less than or equal to 0.06W/(m.k), a flame retardant rating of UL 94V 0, a closed porosity of greater than 80%, a hydrophobicity of greater than or equal to 97%, and a compressive stress corresponding to 20% deformation of less than or equal to 70kPa. The EPDM foaming plate can resist salt fog and high temperature and humidity, and when the structural component is used for the battery pack 100, the reliability of the battery pack 100 in severe working conditions can be improved, and the safety of the battery pack 100 is ensured.

According to some embodiments of the present utility model, the insulating member 20 includes a second insulating layer 22, and the second insulating layer 22 is disposed at the bottom of the case 10. The form of the case 10 may not be particularly limited, for example, the case 10 may include a tray 40 and a sealing cover 30, where the tray 40 and the sealing cover 30 enclose a receiving cavity suitable for receiving a battery, and the "the second insulating layer 22 is disposed at the bottom of the case 10" means that the insulating member 20 is disposed at the bottom plate of the tray 40. The second insulation layer 22 is disposed at the bottom of the case 10 to help the bottom of the battery pack 100 to insulate heat, and to improve the heat insulation performance of the battery pack 100.

According to some embodiments of the present utility model, the case 10 includes a tray 40, the tray 40 includes a plurality of side rails 41, a bottom plate 42 and a bottom protection plate 44, the bottom plate 42 includes a heat exchange plate, the bottom plate 42 and the plurality of side rails 41 enclose a receiving cavity adapted to receive a battery, and the bottom plate 42, the second insulation layer 22 and the bottom protection plate 44 are sequentially disposed in a direction away from the receiving cavity in a thickness direction of the bottom plate 42. That is, the second insulating layer 22 is provided between the bottom plate 42 and the bottom cover 44 in the thickness direction of the bottom plate 42. In this way, some structural support and bottom ball impact energy absorption between the bottom plate 42 and the bottom guard 44 may be achieved while helping to preserve the heat at the bottom of the battery pack 100. In some embodiments, the second thermal insulation layer 22 may be secured between the bottom plate 42 and the bottom guard plate 44 by means of double sided adhesive tape; according to some embodiments of the utility model, the bottom plate 42 is a heat exchange plate (e.g., a cold plate).

According to some embodiments of the present utility model, the tray 40 further includes a reinforcement 45, the reinforcement 45 being disposed between the bottom plate 42 and the second insulation layer 22, the reinforcement 45 being formed with an opening 46 in a thickness direction of the bottom plate 42, the second insulation layer 22 being provided with a protrusion 43, the protrusion 43 being filled in the opening 46, such that the reinforcement 45 and the second insulation layer 22 are integrally formed as a flat plate. The reinforcement 45 may be provided to increase the strength of the battery pack 100, and the opening 46 of the reinforcement 45 may prevent the reinforcement 45 from being excessively heavy, thereby preventing the battery pack 100 from being excessively heavy; the protrusion 43 of the second insulation layer 22 is filled in the opening 46, and the insulation effect on the bottom of the battery pack 100 can be improved due to the lower thermal conductivity of the insulation layer; the reinforcing member 45 and the second heat-insulating layer 22 are integrally formed into a flat plate, so that the reinforcing member 45 and the second heat-insulating layer 22 can be conveniently fixed at the bottom of the box body 10 in a back adhesive mode, and convenience and reliability of assembly are improved. By flat plate is meant herein that the reinforcement 45 and the second heat insulating layer 22 are substantially planar on opposite sides in the thickness direction as a whole, and that the reinforcement 45 and the second heat insulating layer 22 are substantially flush with the side surfaces of the opening 46 of the reinforcement 45 as a whole, so that the reinforcement 45 and the second heat insulating layer 22 as a whole are substantially flat plate-shaped, and it is understood that such limitation does not exclude that the reinforcement 45 and/or the second heat insulating layer 22 have a partially perforated structure for easy installation and removal, etc.

According to some embodiments of the utility model, the thickness of the second insulating layer 22 is 6mm to 15mm. The thickness of the second heat-insulating layer 22 is within the range of 6 mm-15 mm, so that the heat-insulating performance of the battery pack 100 can be ensured, and meanwhile, the battery pack 100 is prevented from occupying too much space, and when the battery pack 100 is installed at the bottom of a vehicle, the battery pack 100 is prevented from being too small in ground clearance. For example, the thickness of the second insulating layer 22 may be 6mm, 8mm, 10mm, 12mm, 14mm, 15mm. It will be appreciated that the thickness of the second insulating layer 22 need not be uniform, and may be thicker in some locations and thinner in other locations. It should be noted that, the second heat-insulating layer 22 may be provided with a avoiding hole at a local position to avoid the problem of disassembling and interfering the bolts of the battery pack 100, and the thickness of the second heat-insulating layer 22 at the avoiding hole is zero, but this should not be understood as contradicting the thickness of the second heat-insulating layer 22 within the range of 6mm to 15mm.

According to some embodiments of the utility model, the second insulation layer 22 has a closed cell ratio of greater than 90%. In this way, the hydrophobic performance of the second insulation layer 22 can be further improved, the battery pack 100 is prevented from being in a moist environment for a long time, and the reliability and safety of the battery pack 100 under the working conditions of wading or being splashed by water and the like are improved.

According to some embodiments of the utility model, the hydrophobicity of the second thermal insulation layer 22 is greater than or equal to 98.5%. In this way, the hydrophobic performance of the second heat-insulating layer 22 can be further improved, long-time water accumulation at the second heat-insulating layer 22 is prevented, and the reliability and safety of the battery pack 100 under the working conditions of wading or being splashed by water and the like are improved.

According to some embodiments of the utility model, the compressive stress corresponding to 10% deformation of the second heat-insulating layer is 0.45MPa to 0.65MPa; the compression stress corresponding to 50% deformation is 0.75-1.05 MPa. In this way, the bottom ball impact energy absorption function can be well considered while the bottom heat preservation function of the battery pack 100 is guaranteed by the second heat preservation layer 22, so that the reliability and the safety of the battery pack 100 are improved. In the embodiment of the utility model, the test standard of compressive stress is carried out by referring to 'GB/T8813-2020 determination of compressive property of rigid foam plastics'. Specifically, the method for testing the compressive stress corresponding to 10% and 50% deformation of the second heat-insulating layer comprises the steps of taking the size (50+/-1) mm (20+/-1) mm of a sample, and calibrating the size according to the specification of GB/T6342-1996 determination of the linear sizes of foamed plastics and rubber; placing the sample in the center of two flat plates of a compression tester, compressing the sample at a rate of 10% of the initial thickness per minute until 50% of the sample is compressed; the force-displacement curve was recorded at the time of measurement, and compression strength of 10% and 50% were specified. The number of samples was at least 5PCS.

According to some embodiments of the present utility model, the shore-C hardness (shore hardness) of the second insulation layer 22 is 75-85 degrees. For example, the hardness of the second thermal insulation layer 22 may be 75 degrees, 80 degrees, 85 degrees. In this way, the bottom ball impact energy absorption effect can be well considered while the bottom structural support effect of the battery pack 100 is ensured by the second heat insulation layer 22, so that the reliability and the safety of the battery pack 100 are improved. In the examples of the present utility model, the hardness is measured by Shore C durometer (Shore-C). In the embodiment of the utility model, the hardness test is referred to the section 2 of the press-in hardness test method of vulcanized rubber or thermoplastic rubber of GB/T531.1-2008: the portable rubber international hardness tester is used for hardness measurement by using a semi-spherical pressing needle of a Shore C type hardness tester, the thickness of a sample is at least 6mm, in order to obtain enough thickness, the sample can be formed by overlapping not more than 3 pieces, the thickness of each piece is not less than 2mm, and a measuring point is at least 12mm away from any edge of the sample. 5 measurements were made at different points on the surface of the sample, with the measurement points being spaced at least 6mm apart by pairs, and then the median of the 5 measurements was taken. The number of samples was at least 5PCS.

According to some embodiments of the utility model, the second insulation layer comprises a foamed polyolefin sheet; according to some embodiments of the present utility model, the second insulation layer 22 is a microporous expanded polypropylene (MPP) board, and the MPP board has a certain structural strength, low thermal conductivity and good hydrophobicity, and is installed at the bottom of the battery pack 100, for example, between the heat exchange plate and the bottom guard plate 44, and may perform the functions of insulation, absorbing energy such as stone impact at the bottom, and the like.

According to some embodiments of the present utility model, in the structural component of the battery pack 100, the second heat-insulating layer 22 is disposed between the heat exchange plate and the bottom guard plate 44, the second heat-insulating layer 22 is a microporous foamed polypropylene plate with a thickness of 6 mm-15 mm, the closed pore rate is greater than 90%, the hydrophobicity rate is greater than or equal to 98.5%, and the compressive stress corresponding to 10% deformation of the second heat-insulating layer is 0.45 MPa-0.65 MPa; the compression stress corresponding to 50% deformation is 0.75-1.05 MPa, and the hardness (shore-C) of the second heat insulation layer 22 is 75-85 degrees. The second insulating layer 22 has certain strength and hardness, is filled between the heat exchange plate and the bottom guard plate 44, can play a certain role in structural support and bottom ball striking energy absorption, and can pass a high-temperature high-humidity high-temperature test and a hernia lamp aging test.

In the embodiment of the utility model, the high-temperature high-humidity test refers to the 2 nd part of GB/T2423.3 environmental test of electrical and electronic products; test method test cab: constant damp-heat test method, high-low temperature test is carried out by referring to GB/T2423.22 environmental test part 2: test method test N: temperature variation, hernia arc lamp aging test was performed with reference to the xenon arc lamp part 2 of the GB/T16422.2 Plastic laboratory light source exposure test method.

According to some embodiments of the present utility model, the case 10 includes a tray 40, the tray 40 includes a bottom plate 42 and a plurality of side beams 41, and the bottom plate 42 and the plurality of side beams 41 enclose a receiving cavity adapted to receive a battery; the side beam 41 is provided with a third heat-insulating layer 23, and the thermal conductivity of the third heat-insulating layer 23 is 0.06W/(m.k) or less. As can be appreciated, in the tray 40, the side beams 41 are spliced end to form the side walls of the tray 40, the side walls and the bottom plate 42 together enclose a containing cavity suitable for containing the battery, the top opening of the containing cavity is sealed by the sealing cover 30, so as to seal the top opening of the battery pack 100. The third insulating layer 23 can effectively insulate the battery pack 100 from the side wall, which is beneficial for maintaining the internal temperature of the battery pack 100 at a relatively stable level.

According to some embodiments of the utility model, the third insulating layer 23 has a porous structure, and the closed cell ratio of the third insulating layer 23 is greater than 85%. In the embodiment of the present utility model, the third heat-insulating layer 23 has a porous structure, for example, the third heat-insulating layer 23 may be a foam board. The closed cell rate of the third heat-insulating layer 23 being greater than 85% means that most of the cells in the third heat-insulating layer 23 are closed cells and are not communicated with the outside, so that water splashed or permeated around the third heat-insulating layer 23 is difficult to enter the third heat-insulating layer 23, water accumulation in the third heat-insulating layer 23 is avoided, and the water-repellent performance of the third heat-insulating layer 23 is improved, so that the water-repellent performance of the battery pack 100 is improved.

According to some embodiments of the utility model, the third thermal insulation layer 23 is a foamed polyurethane board. The foamed polyurethane plate has high adhesive strength, low fire resistance, low thermal conductivity, and the like, and thus can be adhesively fixed to the side sill 41 by structural adhesive. Thereby, the heat preservation and fireproof performance of the battery pack 100 can be further improved, and the charge and discharge performance, reliability and safety of the battery pack 100 can be improved.

According to some embodiments of the utility model, four side beams 41 are spliced end to form the side wall of the tray 40, each side beam 41 is provided with a third heat insulation layer 23, the heat conductivity of the third heat insulation layer 23 is less than or equal to 0.06W/(m.K), the third heat insulation layer 23 is a foamed polyurethane heat insulation board, and the closed cell rate of the foamed polyurethane heat insulation board is more than 85%; a third insulating layer 23 is attached to each side rail 41 by structural adhesive.

According to some embodiments of the utility model, the third insulating layer 23 is provided with relief holes adapted to relieve other elements.

According to some embodiments of the utility model, the structural assembly further comprises a lifting lug fixed to at least one of the side rails 41, said lifting lug being adapted to fixedly attach said structural assembly for the battery pack 100 to the body of the vehicle, said lifting lug being provided with a fourth insulating layer 24. Because the tray 40 is usually made of metal, heat from the inside and outside of the battery pack 100 can be conducted to the lifting lug through the metal tray 40, and the heat insulation performance of the battery pack 100 can be further improved by arranging the fourth heat insulation layer 24 at the lifting lug.

According to some embodiments of the present utility model, the thermal conductivity of the fourth thermal insulation layer 24 is less than or equal to 0.06W/(m.k); the closed cell rate of the fourth insulation layer 24 is greater than 85%. Therefore, the heat insulation performance of the battery pack 100 can be improved at the lifting lug, water accumulation at the lifting lug is prevented, and the performance of the battery pack 100 is improved.

According to some embodiments of the utility model, the fourth insulation layer 24 is a foamed polyurethane insulation board. The foaming polyurethane board has the performances of high bonding strength, fire resistance, low heat conductivity and the like, so that the foaming polyurethane board can be fixedly adhered on the lifting lug through structural adhesive. Thereby, the heat preservation and fireproof performance of the battery pack 100 can be further improved, and the charge and discharge performance, reliability and safety of the battery pack 100 can be improved.

According to some embodiments of the present utility model, the fourth insulating layer 24 is provided with a relief hole adapted to relieve other elements.

A battery pack 100 according to an embodiment of the present utility model is described below with reference to fig. 1 to 4, including: the structural assembly for the battery pack 100 according to the above-described embodiment of the present utility model; a battery, which is accommodated in the case 10.

The battery is accommodated in the case 10, it being understood that the case 10 encloses an accommodating chamber adapted to accommodate the battery, and the battery is disposed in the accommodating chamber. Generally, the housing cavity houses a plurality of batteries, and in some embodiments, the housing cavity is divided into a plurality of sub-housing cavities, some of which are provided with a battery pack, the battery pack including a plurality of batteries, and the rest of which have one or two of which are provided with power distribution modules.

When the battery pack 100 is installed on a vehicle, for example, the battery pack 100 is installed at the bottom of the vehicle, the thermal insulation member 20 at the top of the case 10 is generally horizontally stuck, and if the vehicle is waded or splashed with water, the water at the top of the case 10 cannot be rapidly discharged, and remains on the surface of the thermal insulation member 20; the thermal insulation 20 at the bottom of the case 10 is also typically horizontally affixed, and the bottom of the battery pack 100 disposed at the bottom of the vehicle is typically provided with a bottom guard 44, so that if the vehicle is wading or is subject to water splashing, water is likely to enter between the thermal insulation 20 and the bottom guard 44. According to the battery pack 100 provided by the embodiment of the utility model, water at the heat preservation member 20 can be rapidly discharged, so that the long-term retention of water in the heat preservation member 20 is avoided, the battery pack 100 is prevented from being in a moist environment for a long time, and the reliability and safety of the battery pack 100 under the working conditions of wading or splashing by water are improved.

In some embodiments, the top of the battery pack 100 is provided with the first heat-insulating layer 21, the bottom of the battery pack 100 is provided with the second heat-insulating layer 22, the side beam 41 is provided with the third heat-insulating layer 23, and the lifting lug is provided with the fourth heat-insulating layer 24. By the arrangement of the heat insulating layer, the charge and discharge performance, safety and reliability of the battery pack 100 can be effectively improved.

The vehicle according to the embodiment of the utility model includes the battery pack 100 according to the above-described embodiment of the utility model. The vehicle has the above advantages of the battery pack 100 due to the inclusion of the battery pack 100, and will not be described in detail herein.

In some embodiments, the vehicle includes a body and a battery pack 100, the battery pack 100 is disposed at the bottom of the vehicle, and the thermal insulation member 20 is disposed between the body and the case 10 in the vehicle height direction.

Claims (24)

1. A structural assembly for a battery pack, comprising:

a case adapted to house a battery;

at least one of the first heat-insulating layer and the second heat-insulating layer; the first heat preservation layer is arranged at the top of the box body, the first heat preservation layer is of a porous structure, and the closed pore rate of the first heat preservation layer is more than 80%; the second heat preservation set up in the box bottom, the second heat preservation has porous structure, the obturator rate of second heat preservation is greater than 80%.

2. The structural assembly for a battery pack according to claim 1, wherein the first insulating layer has a thermal conductivity of 0.06W/(m.k) or less; the thermal conductivity of the second heat-insulating layer is less than or equal to 0.06W/(m.K).

3. The structural assembly for a battery pack according to claim 1 or 2, wherein the structural assembly for a battery pack comprises a first insulation layer provided on the top of the case.

4. The structural assembly for a battery pack according to claim 3, wherein the case is adapted to be disposed at a bottom of a vehicle, and the first heat-retaining layer is disposed between a body of the vehicle and the case when the case is disposed at the bottom of the vehicle.

5. The structural assembly for a battery pack according to claim 3, wherein the first insulation layer satisfies at least one of the following (1) - (3):

(1) The hydrophobicity of the first heat preservation layer is more than or equal to 97%;

(2) The flame retardant rating of the first heat preservation layer meets the UL 94V 0 level;

(3) The compressive stress corresponding to 20% deformation of the first heat preservation layer is less than or equal to 70kPa.

6. The structural assembly for a battery pack of claim 3, wherein the first insulating layer has a thickness of 5mm to 15mm.

7. The structural assembly for a battery pack of claim 3, wherein the first insulation layer comprises a foamed rubber sheet.

8. The structural assembly for a battery pack of claim 7, wherein the first insulation layer comprises an ethylene propylene diene monomer foam board.

9. The structural assembly for a battery pack according to claim 1 or 2, wherein the structural assembly for a battery pack comprises a second insulation layer provided at the bottom of the case.

10. The structural assembly for a battery pack according to claim 9, wherein the case comprises a tray, the tray comprises a plurality of side rails, a bottom plate and a bottom guard plate, the bottom plate comprises a heat exchange plate, the bottom plate and the plurality of side rails enclose a receiving cavity suitable for receiving a battery, and in a thickness direction of the bottom plate, the heat exchange plate, the second heat insulating layer and the bottom guard plate are sequentially arranged in a direction away from the receiving cavity.

11. The structural assembly for a battery pack according to claim 10, wherein the tray further comprises a reinforcement provided between the heat exchange plate and the second heat insulating layer, the reinforcement being formed with an opening in a thickness direction of the bottom plate, the second heat insulating layer being provided with a protrusion filled in the opening such that the reinforcement and the second heat insulating layer are integrally formed as a flat plate.

12. The structural assembly for a battery pack of claim 9, wherein the thickness of the second insulating layer is 6mm to 15mm.

13. The structural assembly for a battery pack according to claim 9, wherein the second insulation layer satisfies at least one of the following (1) - (4):

(1) The closed pore rate of the second heat preservation layer is more than 90%;

(2) The hydrophobicity of the second heat preservation layer is more than or equal to 98.5%;

(3) The compressive stress corresponding to 10% deformation of the second heat preservation layer is 0.45-0.65 MPa; compressive stress corresponding to 50% deformation is 0.75-1.05 MPa;

(4) And the Shore-C hardness of the second heat preservation layer is 75-85 degrees.

14. The structural assembly for a battery pack of claim 9, wherein the second insulating layer comprises a foamed polyolefin sheet.

15. The structural assembly for a battery pack of claim 9, wherein the second insulating layer comprises a microporous expanded polypropylene sheet.

16. The structural assembly for a battery pack according to claim 1, wherein the case comprises a tray comprising a bottom plate and a plurality of side rails, the bottom plate and the plurality of side rails enclosing a receiving cavity adapted to receive a battery; and a third heat preservation layer is arranged on the side beam.

17. The structural assembly for a battery pack according to claim 16, wherein the third insulating layer has a thermal conductivity of 0.06W/(m.k) or less.

18. The structural assembly for a battery pack of claim 16, wherein the third insulation layer has a porous structure, and wherein the third insulation layer has a closed cell ratio of greater than 85%.

19. The structural assembly for a battery pack of claim 16, wherein the third insulating layer comprises a polyurethane sheet.

20. The structural assembly for a battery pack of claim 16, further comprising a lifting tab secured to at least one of the plurality of side rails, the lifting tab adapted to attach the structural assembly for a battery pack to a body of a vehicle, the lifting tab having a fourth insulation layer disposed thereon.

21. The structural assembly for a battery pack according to claim 20, wherein the fourth insulating layer has a thermal conductivity of 0.06W/(m.k) or less; and the closed pore rate of the fourth heat preservation layer is more than 85%.

22. The structural assembly for a battery pack of claim 20, wherein the fourth insulation layer comprises a foamed polyurethane sheet.

23. A battery pack, comprising:

a structural assembly for a battery pack according to any one of claims 1 to 22;

and a battery accommodated in the case.

24. A vehicle comprising the battery pack of claim 23.