Battery pack, vehicle and electric equipment

Abstract

The present invention discloses a battery pack, a vehicle, and an electrical device, relating to the field of battery technology. The battery pack comprises a cover and a tray, the cover and tray being connected and jointly defining a battery mounting cavity; and a battery module mounted within the battery mounting cavity. A first internal buffer and insulation layer is provided between the battery module and the cover. The battery pack of the present invention occupies a small space, effectively protects and insulates the battery module, and extends the battery's service life.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a battery pack, a vehicle having the battery pack, and an electrical device having the battery pack. Background Art

[0002] In related technologies, the battery insulation cotton is set between the battery tray and the vehicle body floor. The insulation cotton has a certain amount of compression, and there are problems such as large space occupied in the vertical direction, unstable vehicle body, and poor thermal insulation ability of the battery pack. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a battery pack that occupies a small space and can effectively protect and keep the battery module warm, thereby extending the battery life.

[0004] According to an embodiment of the present invention, the battery pack includes: a cover and a tray, the cover and the tray are connected and jointly define a battery installation cavity; a battery module, the battery module is installed in the battery installation cavity; wherein a first inner buffer insulation layer is provided between the battery module and the cover.

[0005] According to the battery pack of an embodiment of the present invention, by providing a first inner buffer insulation layer between the battery module and the cover body, the buffering capacity of the battery pack in the vertical direction is enhanced, thereby achieving effective protection of the battery module. The first inner buffer insulation layer is provided inside the battery mounting cavity and does not occupy additional space, thereby improving the structural compactness of the battery pack. At the same time, the battery module is insulated, thereby avoiding capacity loss or starting difficulty of the battery module due to low temperature, reducing the risk of overheating of the battery module, and extending the battery life, thereby improving the structural stability and safety of the battery pack in the vertical direction, so that the battery pack has temperature uniformity in all climates (normal temperature, high temperature, and low temperature).

[0006] According to the battery pack of some embodiments of the present invention, an outer buffer and thermal insulation layer is provided on the outside of the tray.

[0007] According to some embodiments of the battery pack of the present invention, the outer buffer and thermal insulation layer is provided on a surface of the tray facing away from the cover.

[0008] According to some embodiments of the battery pack of the present invention, the outer buffer and thermal insulation layer is constructed of a first low-resilience foam; or, the outer buffer and thermal insulation layer is constructed of a composite double-layer foam.

[0009] According to the battery pack of some embodiments of the present invention, the composite double-layer cotton includes a second low-resilience foam and a high-resilience foam, the second low-resilience foam is connected to the surface of the tray, and the high-resilience foam is connected to the side of the second low-resilience foam facing away from the tray.

[0010] According to the battery pack of some embodiments of the present invention, the high-resilience foam is provided with a first skin on the side facing away from the second low-resilience foam; and / or the second low-resilience foam is provided with a second skin on the side facing away from the high-resilience foam, and the second skin is adhered to the surface of the tray.

[0011] According to the battery pack of some embodiments of the present invention, the thickness of the second low-rebound foam is greater than the thickness of the high-rebound foam; and / or the thickness h of the composite double-layer cotton satisfies: 4mm≤h≤15mm; and / or the compression rate a of the composite double-layer cotton satisfies: 0%<a≤50%.

[0012] According to the battery pack of some embodiments of the present invention, a plurality of first micropores are formed in both the first low-resilience foam and the second low-resilience foam, and two adjacent ones of the plurality of first micropores are connected through an interconnecting hole.

[0013] According to some embodiments of the battery pack of the present invention, the diameter d1 of the first micropore satisfies: 0.5 mm ≤ d1 ≤ 1.5 mm; and / or the water absorption rate of the first low-resilience foam and the second low-resilience foam is less than 1%.

[0014] According to the battery pack of some embodiments of the present invention, second micropores are formed in the high-resilience foam, and there are a plurality of second micropores, which are sealed with each other.

[0015] According to the battery pack of some embodiments of the present invention, a diameter of the first micropore is greater than a diameter of the second micropore.

[0016] According to some embodiments of the present invention, the battery pack further includes a bottom guard plate, which is disposed below the tray, and the outer buffer insulation layer is located between the lower surface of the tray and the bottom guard plate.

[0017] According to the battery pack of some embodiments of the present invention, a second inner buffer insulation layer is provided between the battery module and the inner side surface of the tray.

[0018] According to some embodiments of the battery pack of the present invention, a plastic layer is further provided between the battery module and the second inner buffer insulation layer.

[0019] According to the battery pack of some embodiments of the present invention, the second inner buffer insulation layer is an annular layer, and the second inner buffer insulation layer is arranged around the battery module; or, there are multiple second inner buffer insulation layers, and the multiple second inner buffer insulation layers are respectively arranged on multiple sides of the battery module in a one-to-one correspondence.

[0020] According to the battery pack of some embodiments of the present invention, a heat insulation layer is further provided on the outer side of the tray.

[0021] According to some embodiments of the battery pack of the present invention, the thermal insulation layer is an annular layer, and the thermal insulation layer is arranged around the tray; or, there are multiple thermal insulation layers, and the multiple thermal insulation layers are respectively arranged on multiple sides of the tray in a one-to-one correspondence.

[0022] According to the battery pack of some embodiments of the present invention, the thermal insulation layer is constructed of one of high-resilience PO cotton, EMDM cotton and PU cotton.

[0023] The present invention also provides a vehicle.

[0024] A vehicle according to an embodiment of the present invention includes a vehicle body floor, an exhaust pipe, and the battery pack according to any one of the above embodiments, wherein the battery pack is connected below the vehicle body floor, and the exhaust pipe is located on one side of the battery pack.

[0025] The invention also provides an electrical device.

[0026] An electric device according to an embodiment of the present invention includes the battery pack described in the above embodiment.

[0027] The advantages of the vehicle, the electrical equipment and the battery pack described above compared to the prior art are the same and will not be repeated here.

[0028] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0030] Figure 1 is a cross-sectional view of a battery pack according to an embodiment of the present invention;

[0031] Figure 2 2 is a schematic structural diagram of a composite double-layer cotton according to an embodiment of the present invention;

[0032] Figure 3 is a schematic structural diagram of a second low-resilience foam according to an embodiment of the present invention;

[0033] Figure 4 2 is a schematic structural diagram of a high-resilience foam according to an embodiment of the present invention.

[0034] Reference numerals:

[0035] Battery pack 100,

[0036] Cover 1, tray 2, battery module 3, battery installation cavity 4,

[0037] First inner buffer insulation layer 51, composite double-layer cotton 52, second low-resilience foam 521, second crust 5211, first micropores 5212, interconnecting holes 5213, high-resilience foam 522, first crust 5221, second micropores 5222, second inner buffer insulation layer 53, plastic layer 54, thermal insulation layer 55,

[0038] Underbody guard plate 6, vehicle body bottom plate 7, exhaust pipe 8. DETAILED DESCRIPTION

[0039] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0041] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0042] Unless otherwise specified, the front-to-back direction in this application is the longitudinal direction of the vehicle, that is, the X direction; the left-right direction is the lateral direction of the vehicle, that is, the Y direction; and the up-down direction is the vertical direction of the vehicle, that is, the Z direction.

[0043] Reference below Figures 1 to 4A battery pack 100 according to an embodiment of the present invention is described. The battery pack 100 occupies a small space and can effectively protect and keep the battery module 3 warm, thereby extending the battery life.

[0044] like Figures 1 to 4 As shown, a battery pack 100 according to an embodiment of the present invention includes: a cover 1 , a tray 2 and a battery module 3 .

[0045] The cover 1 is connected to the tray 2 and defines a battery installation cavity 4 together. That is, the interior of the tray 2 can be hollow and one side is open. The cover 1 can be placed on the open side of the tray 2 to close the tray 2, so that the cover 1 and the tray 2 can define a closed battery installation cavity 4 together. Alternatively, refer to the attached Figure 1 As shown, the interior of the tray 2 can be hollow and open on one side, and the interior of the cover body 1 can also be hollow and open on one side. The open side of the tray 2 can be opposite to the open side of the cover body 1 and connected by a connecting flange, so that the interior of the tray 2 is connected to the interior of the cover body 1. The cover body 1 and the tray 2 jointly define a closed battery installation cavity 4, and the cover body 1 and the tray 2 can also be connected by seals, connectors, etc., to improve the connection stability and reliability between the cover body 1 and the tray 2, and improve the sealing of the battery installation cavity 4.

[0046] The battery module 3 is the core unit of the battery pack 100. It is composed of multiple battery cells connected in series or parallel. The battery module 3 supports high power output and endurance requirements. The battery module 3 can meet the power requirements of vehicles, energy storage systems, etc.

[0047] The battery module 3 is installed in the battery mounting cavity 4, that is, the shape of the battery mounting cavity 4 is adapted to the shape and size of the battery module 3, so that the battery module 3 can be stably installed in the battery mounting cavity 4. The cover 1 and the tray 2 can effectively protect the battery module 3 to resist external impact, extrusion, etc., and protect the battery module 3 from damage.

[0048] The tray 2 is mainly used to carry the battery module 3, improve the overall structural strength of the battery pack 100, and ensure the installation stability of the battery module 3. The cover 1 is mainly used to seal the battery installation cavity 4 to ensure the sealing of the battery installation cavity 4, thereby preventing external moisture, dust, salt spray, etc. from invading the battery installation cavity 4, thereby preventing the battery module 3 from being damaged.

[0049] Furthermore, a first inner buffer and thermal insulation layer 51 is provided between the battery module 3 and the cover 1 , and an outer buffer and thermal insulation layer is provided on the outside of the tray 2 .

[0050] That is, the first inner buffer insulation layer 51 is arranged in the battery installation cavity 4 and between the battery module 3 and the cover 1, that is, one side surface of the first inner buffer insulation layer 51 is in contact with the cover 1, and the other side opposite surface of the first inner buffer insulation layer 51 is in contact with the battery module 3. Figure 1 As shown, the first inner buffer insulation layer 51 is arranged horizontally, so that the first inner buffer insulation layer 51 can buffer and insulate the battery module 3 in the vertical direction, that is, when the battery pack 100 is subjected to an impact force in the vertical direction, the first inner buffer insulation layer 51 can absorb the impact force to achieve a buffering effect, thereby enhancing the buffering capacity of the battery pack 100 in the vertical direction, preventing the battery module 3 from being damaged by the impact force in the vertical direction, enhancing the stability of the battery pack 100 in the vertical direction, and achieving effective protection for the battery module 3. The first inner buffer insulation layer 51 is arranged inside the battery mounting cavity 4, does not occupy additional space, and improves the structural compactness of the battery pack 100. At the same time, the first inner buffer insulation layer 51 can insulate the battery module 3, isolate the inside of the battery installation cavity 4 from the outside, and reduce the heat exchange between the battery installation cavity 4 and the outside world, thereby reducing the heat loss of the battery module 3 in a low temperature environment and delaying the conduction of external heat into the battery installation cavity 4, thereby avoiding the capacity drop or starting difficulty of the battery module 3 due to low temperature, reducing the risk of overheating of the battery module 3, and extending the battery life.

[0051] Therefore, by providing a buffer insulation layer inside the battery pack 100 to protect the battery module 3, the structural stability and safety of the battery pack 100 in the vertical direction are improved, so that the battery pack 100 has a uniform temperature performance in all climates (normal temperature, high temperature, and low temperature).

[0052] According to the battery pack 100 of the embodiment of the present invention, the buffering capacity of the battery pack 100 in the vertical direction is enhanced by providing a first inner buffer insulation layer 51 between the battery module 3 and the cover body 1, thereby achieving effective protection of the battery module 3. The first inner buffer insulation layer 51 is provided inside the battery mounting cavity 4 and does not occupy additional space, thereby improving the structural compactness of the battery pack 100. At the same time, the battery module 3 is insulated, thereby avoiding capacity reduction or starting difficulty of the battery module 3 due to low temperature, reducing the risk of overheating of the battery module 3, and extending the battery life, thereby improving the structural stability and safety of the battery pack 100 in the vertical direction, so that the battery pack 100 has temperature uniformity in all climates (normal temperature, high temperature, and low temperature).

[0053] In some embodiments, an outer buffering and heat-insulating layer is provided on the outside of the tray 2 .

[0054] Specifically, the outer buffer insulation layer is arranged on the outside of the battery installation cavity 4. The outer buffer insulation layer can resist the bottom impact and keep the battery module 3 warm. The outer buffer insulation layer can be arranged horizontally. In this way, when the battery pack 100 is subjected to the impact force from the bottom, the outer buffer insulation layer can effectively resist the external impact force and prevent the impact force from being transmitted to the inside of the battery pack 100, thereby avoiding damage to the battery module 3 and further realizing effective protection of the battery module 3. At the same time, the outer buffer insulation layer can keep the battery module 3 warm, further reduce the heat loss of the battery module 3 in a low temperature environment and delay the conduction of external heat into the battery installation cavity 4, thereby further avoiding the capacity drop or starting difficulty of the battery module 3 due to low temperature, further reducing the risk of overheating of the battery module 3, and further extending the battery life.

[0055] Therefore, by providing a buffer insulation layer both inside and outside the battery pack 100 to protect the battery module 3, the structural stability and safety of the battery pack 100 in the vertical direction are further improved, so that the battery pack 100 has better temperature uniformity in all climates (normal temperature, high temperature, and low temperature).

[0056] In some embodiments, the outer buffer and thermal insulation layer is disposed on the surface of the tray 2 facing away from the cover 1 .

[0057] Specifically, if Figure 1 As shown, the outer buffer insulation layer is horizontally arranged on the surface of the tray 2 facing away from the cover body 1, that is, on the bottom surface of the tray 2. As a result, the outer buffer insulation layer can be attached to the lower surface of the cover body 1, thereby effectively resisting the impact force from the bottom of the tray 2, achieving effective protection for the battery module 3, and preventing external heat from being transferred to the inside of the battery pack 100, thereby achieving insulation of the battery module 3 and preventing the battery pack 100 from overheating and low temperature.

[0058] In some embodiments, the outer buffer insulation layer is constructed of a first low-resilience foam.

[0059] Specifically, the first low-rebound foam has the characteristics of slow recovery after compression deformation, thermal insulation, buffering and vibration reduction, chemical corrosion resistance, easy processing, sound insulation and noise reduction. Therefore, by constructing the outer buffer insulation layer as the first low-rebound foam, it can effectively absorb vibration or impact energy, enhance the buffering effect, and avoid impact damage to the battery module 3. It can also reduce the heat transfer efficiency, achieve thermal insulation, and help maintain the internal temperature of the battery pack 100 stable, reduce the impact of the external environment on the battery module 3, and deform slowly, which can evenly disperse the pressure, avoid local pressure concentration, reduce the risk of damage to the battery module 3, and facilitate installation on the outside of the tray 2.

[0060] Alternatively, the outer buffer and heat-insulating layer is constructed of a composite double-layer cotton 52 .

[0061] Specifically, the composite double-layer cotton 52 is composed of two cotton layers of different densities or materials stacked together to achieve complementary physical properties. For example, one layer can be a low-density cotton layer to disperse pressure, enhance thermal insulation, and be easy to install. The other layer can be a high-density cotton layer to enhance resistance to external impact, improve support capacity, inhibit deformation, and effectively absorb impact force.

[0062] Therefore, by constructing the outer buffer and thermal insulation layer as a composite double-layer cotton 52, the effects of heat insulation and resistance to external impact can be better achieved.

[0063] In some embodiments, the composite double-layer cotton 52 includes a second low-resilience foam 521 and a high-resilience foam 522 . The second low-resilience foam 521 is connected to the surface of the tray 2 , and the high-resilience foam 522 is connected to the side of the second low-resilience foam 521 facing away from the tray 2 .

[0064] Specifically, if Figure 2 As shown, the composite double-layer cotton 52 includes a second low-rebound foam 521 and a high-rebound foam 522. The second low-rebound foam 521 can effectively absorb vibration or impact energy, enhance the buffering effect, and prevent the battery module 3 from being damaged by impact. It can also reduce the heat transfer efficiency, achieve heat insulation, and help maintain the internal temperature of the battery pack 100 stable, reduce the impact of the external environment on the battery module 3, and deform slowly, which can evenly disperse the pressure, avoid local pressure concentration, and reduce the risk of damage to the battery module 3.

[0065] High-rebound foam 522 has high resilience, is not easy to deform, recovers quickly after deformation, is not easy to be damaged, can absorb mechanical vibration and impact energy, has good softness and tensile strength, and can effectively resist external impact.

[0066] Among them, such as Figure 2 As shown in the middle direction, the second low-resilience foam 521 and the high-resilience foam 522 are stacked in the up-down direction, the second low-resilience foam 521 is located in the upper layer, and the high-resilience foam 522 is located in the lower layer, as shown in FIG. Figure 1 As shown, the upper surface of the second low-rebound foam 521 is connected to the lower surface of the tray 2 to facilitate installation and enhance the thermal insulation effect. At the same time, it enhances the buffering effect to prevent the impact force from being transmitted to the inside of the battery pack 100. The high-rebound foam 522 is connected to the side of the second low-rebound foam 521 away from the tray 2, that is, the lower surface of the second low-rebound foam 521. In this way, when subjected to an impact force from the bottom direction of the battery pack 100, the high-rebound foam 522 can first absorb most of the impact energy to reduce the impact energy transmitted to the inside of the battery pack 100, and at the same time, stably support the tray 2.

[0067] Therefore, through the combined effect of the second low-rebound foam 521 and the high-rebound foam 522, the thermal insulation performance and external impact resistance of the composite double-layer cotton 52 are effectively improved, thereby achieving temperature stability inside the battery pack 100 and effective protection of the battery module 3.

[0068] In some embodiments, the high-resilience foam 522 is provided with a first crust 5221 on a side facing away from the second low-resilience foam 521 .

[0069] Specifically, if Figure 4 As shown, the high-resilience foam 522 is on the side away from the second low-resilience foam 521, that is, Figure 1 The lower side of the high-resilience foam 522 shown in the middle direction is provided with a first crust 5221 . The first crust 5221 has low porosity and can be used as a connecting layer to connect with other structures.

[0070] In some other embodiments, the second low-resilience foam 521 is provided with a second crust 5211 on a side facing away from the high-resilience foam 522 , and the second crust 5211 is adhered to the surface of the tray 2 .

[0071] Specifically, if Figure 3 As shown, the second low-resilience foam 521 is on the side away from the high-resilience foam 522, that is, Figure 1 The second low-rebound foam 521 shown in the figure is provided with a second crust 5211 on the upper side, and the second low-rebound foam 521 can be connected to the lower surface of the tray 2 by fitting the second crust 5211 to the lower surface of the tray 2 to achieve the connection between the second low-rebound foam 521 and the tray 2. The second crust 5211 has a low porosity and can serve as a physical barrier layer to prevent the internal gas of the second low-rebound foam 521 from being discharged from the upper surface of the second low-rebound foam 521, thereby reducing the transmission of impact force in the vertical direction and avoiding affecting the tray 2 and the battery module 3. In other words, when the second low-rebound foam 521 is compressed, the gas will be discharged from the side of the second low-rebound foam 521, and will not be discharged from the upper surface of the second low-rebound foam 521.

[0072] In some embodiments, the thickness of the second low-resilience foam 521 is greater than the thickness of the high-resilience foam 522 .

[0073] Specifically, if Figure 2As shown, the thickness of the second low-rebound foam 521 is greater than the thickness of the high-rebound foam 522. Thus, the thermal insulation and buffering effects of the second low-rebound foam 521 can be improved, the thermal insulation effect can be enhanced, and the external heat can be effectively isolated from being transferred to the inside of the battery pack 100. When impacted, the low-thickness high-rebound foam 522 serves as the first protective layer, which can quickly deform and rebound to absorb most of the impact energy, and the high-thickness second low-rebound foam 521 can slowly deform and rebound to absorb the remaining impact energy. Since the second low-rebound foam 521 is thicker, the energy absorption path can be extended to fully absorb the remaining impact energy and prevent the impact force from being transmitted to the inside of the battery pack 100.

[0074] In other embodiments, the thickness h of the composite double-layer cotton 52 satisfies: 4 mm ≤ h ≤ 15 mm.

[0075] That is to say, the thickness h of the composite double-layer cotton 52 can be set to 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm or other values ​​within the range of 4mm to 15mm. It can be understood that the thicker the thickness of the composite double-layer cotton 52 is set, the better its thermal insulation performance and resistance to external impact will be, but the occupied space will also increase accordingly, especially the occupied size in the vertical direction will increase, and there is a risk of impact energy rebound. The thinner the thickness of the composite double-layer cotton 52 is set, the worse its thermal insulation performance and resistance to external impact will be.

[0076] Therefore, by setting the thickness h of the composite double-layer cotton 52 within a reasonable range of 4mm to 15mm, the thermal insulation performance and external impact resistance of the composite double-layer cotton 52 are guaranteed, the risk of impact energy rebound is avoided, the best use effect is achieved, and the composite double-layer cotton 52 is avoided from occupying too much space.

[0077] In other embodiments, the compression rate a of the composite double-layer cotton 52 satisfies: 0%<a≤50%.

[0078] That is to say, the compression rate a of the composite double-layer cotton 52 can be set to 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50% or other values ​​within this range. It can be understood that the higher the compression rate, the greater the compression amount the composite double-layer cotton 52 can be subjected to, so as to undergo deep deformation and absorb greater impact energy. However, too large a compression rate may cause the rebound to be too slow, and after multiple impacts, the composite double-layer cotton 52 may fail due to insufficient rebound. Correspondingly, the lower the compression rate, the smaller the compression amount the composite double-layer cotton 52 can be subjected to, and the stronger the supporting force, but it may cause the inability to fully absorb the impact energy, thereby weakening the thermal insulation performance.

[0079] Therefore, by setting the compression rate a of the composite double-layer cotton 52 within a reasonable range of 0% to 50%, the composite double-layer cotton 52 can fully absorb the impact energy, ensuring the thermal insulation performance and external impact resistance of the composite double-layer cotton 52, and achieving the best use effect.

[0080] In some embodiments, a plurality of first micropores 5212 are formed in both the first low-resilience foam 521 and the second low-resilience foam 521 , and two adjacent first micropores 5212 are connected through an interconnecting hole 5213 .

[0081] Specifically, if Figure 3 As shown, a plurality of first micropores 5212 are formed in the first low-rebound foam and the second low-rebound foam 521, and two adjacent ones of the plurality of first micropores 5212 are connected through an interconnecting hole 5213, so that the plurality of first micropores 5212 are in a connected state. In this way, when the first low-rebound foam or the second low-rebound foam 521 is compressed, the gas inside the first low-rebound foam or the second low-rebound foam 521, that is, the gas in the plurality of first micropores 5212, will flow through the interconnecting holes 5213 to achieve a buffering effect, and flow to the side of the first low-rebound foam or the second low-rebound foam 521, and be discharged from the side.

[0082] In some embodiments, the diameter d1 of the first microhole 5212 satisfies: 0.5 mm ≤ d1 ≤ 1.5 mm.

[0083] That is to say, the diameter d1 of the first micropore 5212 can be set to 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm or other values ​​within this range. It can be understood that the larger the diameter d1 of the first micropore 5212, the larger the size of the first micropore 5212, the easier it is to deform and absorb vibration and impact energy. However, if the diameter d1 of the first micropore 5212 is too large, the structural strength of the first low-rebound foam and the second low-rebound foam 521 will be poor, making the first micropore 5212 more likely to rupture, resulting in poor resilience and affecting the compression performance. Correspondingly, the smaller the diameter d1 of the first micropore 5212, the smaller the size of the first micropore 5212, which is conducive to improving the resilience of the first low-rebound foam and the second low-rebound foam 521. However, if the diameter d1 of the first micropore 5212 is too small, it will not be able to effectively absorb vibration and impact energy.

[0084] Therefore, by setting the diameter d1 of the first micropore 5212 within a reasonable range of 0.5 mm to 1.5 mm, the first low-rebound foam and the second low-rebound foam 521 can maintain good resilience and resistance to compression deformation, thereby fully absorbing vibration and impact energy, while ensuring that the structural strength of the first low-rebound foam and the second low-rebound foam 521 is strong.

[0085] In other embodiments, the water absorption rate of the first low-resilience foam and the second low-resilience foam 521 is less than 1%.

[0086] That is to say, the water absorption rate of the first low rebound foam and the second low rebound foam 521 can be set to 0%, 0.5%, 0.8%, etc. In other words, the first low rebound foam and the second low rebound foam 521 are hydrophobic. In this way, the water absorption capacity of the first low rebound foam and the second low rebound foam 521 is poor, which can enhance the durability of the first low rebound foam and the second low rebound foam 521, and can maintain the original performance and shape during long-term use, which is conducive to use in a humid environment.

[0087] In some embodiments, a second micropore 5222 is formed in the high-resilience foam 522 . There are a plurality of second micropores 5222 , and the plurality of second micropores 5222 are closed to each other.

[0088] Specifically, if Figure 4 As shown, second micropores 5222 are formed in the high-resilience foam 522, and there are multiple second micropores 5222. The multiple second micropores 5222 are closed to each other, that is, the multiple second micropores 5222 are not connected to each other. In this way, when the high-resilience foam 522 is compressed, the gas inside the high-resilience foam 522, that is, the gas in the multiple second micropores 5222 cannot be discharged, thereby achieving rapid absorption of impact energy. When the pressure is unloaded, the high-resilience foam 522 will return to its original shape.

[0089] In some embodiments, the diameter of the first micropore 5212 is greater than the diameter of the second micropore 5222 .

[0090] That is to say, the size of the first micropore 5212 is larger than that of the second micropore 5222. Therefore, the small micropore structure of the high-rebound foam 522 can make the high-rebound foam 522 disperse the pressure more evenly when under pressure, and quickly return to its original shape when the pressure is released, thereby improving the resilience of the high-rebound foam 522. At the same time, the structural strength of the high-rebound foam 522 is enhanced, and the large micropore structure of the first low-rebound foam 521 and the second low-rebound foam 521 can enhance the cushioning effect.

[0091] Therefore, in the composite double-layer cotton 52, the small microporous structure of the high-rebound foam 522 and the large microporous structure of the second low-rebound foam 521 complement each other. The small microporous structure of the high-rebound layer is used for rapid support and energy dispersion, and the large microporous structure of the low-rebound layer is used to provide deep buffering, thereby achieving effective insulation and protection of the battery module 3.

[0092] In some embodiments, the battery pack 100 further includes a bottom guard plate 6 , which is disposed below the tray 2 , and an outer buffer insulation layer is located between the lower surface of the tray 2 and the bottom guard plate 6 .

[0093] Specifically, if Figure 1 As shown, the battery pack 100 also includes a bottom guard plate 6, which is disposed below the tray 2. The outer buffer insulation layer is located between the lower surface of the tray 2 and the upper surface of the bottom guard plate 6. When the battery pack 100 is used in a vehicle, the bottom guard plate 6 protects the battery pack 100 from being hit by obstacles such as road gravel, preventing damage to the battery pack 100. It also effectively supports the bottom of the battery pack 100, enhancing the overall structural strength of the battery pack 100.

[0094] By setting the outer buffer insulation layer between the lower surface of the tray 2 and the bottom guard plate 6, the impact force from the bottom guard plate 6 to the inside of the battery pack 100 can be effectively blocked and absorbed, the structural strength in the vertical direction can be improved, and the impact energy transmitted upward can be reduced, thereby protecting the battery module 3 and reducing the temperature dissipated from the bottom of the battery pack 100.

[0095] In some embodiments, a second inner buffer insulation layer 53 is provided between the battery module 3 and the inner side surface of the tray 2 .

[0096] Specifically, if Figure 1 As shown, a second inner buffer insulation layer 53 is provided between the battery module 3 and the inner side surface of the tray 2. The second inner buffer insulation layer 53 is vertically arranged. The second inner buffer insulation layer 53 can buffer and insulate the battery module 3 in the horizontal direction. When the battery pack 100 is subjected to horizontal impact force, the second inner buffer insulation layer 53 can absorb the impact force to achieve a buffering effect, thereby enhancing the buffering capacity of the battery pack 100 in the horizontal direction, further effectively protecting the battery module 3, and preventing the battery module 3 from being damaged by the impact force in the horizontal direction. At the same time, the second inner buffer insulation layer 53 can insulate the battery module 3, reduce the internal temperature loss of the battery pack 100, thereby further avoiding the capacity drop or starting difficulty of the battery module 3 due to low temperature, and further extending the battery life.

[0097] In some embodiments, a plastic layer 54 is further provided between the battery module 3 and the second inner buffer insulation layer 53 .

[0098] Specifically, if Figure 1As shown, a plastic layer 54 is further provided between the battery module 3 and the second inner buffer insulation layer 53. The plastic layer 54 is arranged vertically. The plastic layer 54 can work together with the second inner buffer insulation layer 53 to firmly install the battery module 3 in the tray 2 to prevent the battery module 3 from shaking, deflecting, etc., which may cause wear and damage to the battery module 3.

[0099] In some embodiments, the second inner buffer thermal insulation layer 53 is an annular layer, and the second inner buffer thermal insulation layer 53 is disposed around the battery module 3 .

[0100] In this way, the entire circumference of the battery module 3 can be buffered and insulated, preventing the internal temperature of the battery pack 100 from dissipating from any side in the horizontal direction, such as the left side, right side, front side or right side, and preventing the impact force from any side in the horizontal direction from causing damage to the battery module 3, and the annular second inner buffer insulation layer 53 is easy to manufacture and convenient for quick installation.

[0101] Alternatively, there are multiple second inner buffer thermal insulation layers 53 , and the multiple second inner buffer thermal insulation layers 53 are respectively disposed on multiple side surfaces of the battery module 3 in a one-to-one correspondence.

[0102] That is to say, the second inner buffer insulation layer 53 can be set to two, three, four or more. For example, the second inner buffer insulation layer 53 can be set to four, and the four second inner buffer insulation layers 53 can be respectively arranged on the left side, right side, front side and right side of the battery module 3 to provide buffering and insulation for the entire circumference of the battery module 3. In this way, when one of the second inner buffer insulation layers 53 is damaged or fails, the second inner buffer insulation layer 53 can be removed for replacement without replacing the entire second inner buffer insulation layer 53, which is flexible and convenient.

[0103] In some embodiments, a heat insulating layer 55 is further provided on the outer side of the tray 2 .

[0104] Specifically, if Figure 1 As shown, the outer side of the tray 2 is further provided with an insulation layer 55, which is arranged vertically and adheres to the outer surface of the tray 2. The insulation layer 55 can buffer and insulate the battery module 3 in the horizontal direction. When the battery pack 100 is subjected to horizontal impact force, the outer buffer insulation layer can absorb the impact force to achieve a buffering effect, thereby enhancing the buffering capacity of the battery pack 100 in the horizontal direction, further effectively protecting the battery module 3, and preventing the battery module 3 from being damaged by the impact force in the horizontal direction. At the same time, the outer buffer insulation layer can isolate the heat from the external environment, effectively isolating the external heat from being transferred to the inside of the battery pack 100, thereby reducing the risk of overheating of the battery module 3 and further extending the battery life.

[0105] Therefore, by setting the insulation layer 55, the plastic layer 54, the first inner buffer insulation layer 51, the outer buffer insulation layer and the second inner buffer insulation layer 53, the battery pack 100 is buffered and insulated in both the horizontal and vertical directions, so that the battery pack 100 has excellent impact resistance and thermal insulation and heat preservation properties.

[0106] In some embodiments, the thermal insulation layer 55 is an annular layer, and the thermal insulation layer 55 is disposed around the tray 2 .

[0107] In this way, the entire circumference of the battery module 3 can be insulated to prevent heat from the external environment from being transferred to the inside of the battery pack 100 from any side in the horizontal direction, such as from the left side, right side, front side or right side, and to prevent impact force from any side in the horizontal direction from being transferred to the inside of the battery pack 100 to cause damage to the battery module 3. The annular insulation layer 55 is easy to manufacture and can be quickly installed.

[0108] Alternatively, there are multiple heat insulation layers 55 , and the multiple heat insulation layers 55 are respectively disposed on multiple side surfaces of the tray 2 in a one-to-one correspondence.

[0109] That is to say, the thermal insulation layer 55 can be set to two, three, four or more. For example, the thermal insulation layer 55 can be set to four, and the four thermal insulation layers 55 can be respectively set on the left side, right side, front side and right outside of the tray 2 to insulate the entire circumference of the battery pack 100. In this way, when one of the thermal insulation layers 55 is damaged or fails, this thermal insulation layer 55 can be removed for replacement without replacing the entire thermal insulation layer 55, which is flexible and convenient.

[0110] In some embodiments, the thermal insulation layer 55 is constructed of one of high resilience PO cotton, EMDM cotton and PU cotton.

[0111] Specifically, high-rebound PO cotton (polyolefin foam) is a high-performance foaming material based on polyolefin. The foaming forms include open-cell foaming and closed-cell foaming. High-rebound PO cotton has the characteristics of super rebound and deformation recovery ability, wide temperature resistance, moisture and mildew resistance, and impact energy absorption. By constructing the thermal insulation layer 55 as high-rebound PO cotton, it can effectively isolate external heat while ensuring its own stable performance, and can efficiently absorb impact energy to prevent external impact energy from being transmitted to the inside of the battery pack 100.

[0112] EMDM cotton is a foam material based on EPDM (ethylene propylene diene monomer) rubber. EMDM cotton has the characteristics of high resilience, fatigue resistance, high-temperature stability, low-temperature flexibility, chemical stability, thermal insulation and electrical insulation. By constructing the thermal insulation layer 55 as EMDM cotton, it can effectively isolate external heat, ensure its own stable performance, and provide effective insulation protection for the battery pack 100. It can also efficiently absorb impact energy, prevent external impact energy from being transmitted to the inside of the battery pack 100, and extend the service life of the thermal insulation layer 55.

[0113] PU cotton (polyurethane foam) is a high-performance foam material. PU cotton has the characteristics of excellent elasticity and rebound performance, outstanding sound insulation and heat insulation capabilities, excellent wear resistance and aging resistance, and excellent chemical corrosion resistance. By constructing the insulation layer 55 as PU cotton, the insulation capacity of the insulation layer 55 can be greatly improved, the service life of the insulation layer 55 can be extended, and the impact energy can be fully absorbed.

[0114] Therefore, by constructing the insulation layer 55 as one of high-rebound PO cotton, EMDM cotton and PU cotton, the insulation layer 55 can have high heat resistance and high adhesion performance, with a heat resistance temperature between 95°C and 200°C, thereby improving the insulation performance of the insulation layer 55, facilitating connection with the outer surface of the pallet 2, and effectively absorbing impact energy.

[0115] The present invention also provides a vehicle.

[0116] The vehicle according to an embodiment of the present invention includes a vehicle body floor 7 , an exhaust pipe 8 and a battery pack 100 according to any one of the above embodiments. The battery pack 100 is connected below the vehicle body floor 7 , and the exhaust pipe 8 is located on one side of the battery pack 100 .

[0117] The vehicle of this embodiment may be a hybrid vehicle, a pure electric vehicle, an extended-range electric vehicle, etc., and a hybrid vehicle is taken as an example for description.

[0118] Specifically, if Figure 1 As shown, the battery pack 100 is connected to the bottom of the vehicle body floor 7, and the exhaust pipe 8 is located on one side of the battery pack 100. The heat of the exhaust pipe 8 is relatively high, and its heat will be transferred to the battery pack 100, causing damage to the battery pack 100. By setting a high-temperature resistant insulation layer 55 on the outside of the tray 2, the heat damage of the exhaust pipe 8 can be effectively isolated and the battery pack 100 can be kept warm at low temperatures.

[0119] Therefore, through the arrangement of the inner buffer insulation layer, the outer buffer insulation layer and the external thermal insulation layer 55, the hybrid vehicle has structural stability and temperature uniformity performance under all working conditions (fuel mode, pure electric mode and hybrid mode) and all climates (normal temperature, high temperature and low temperature), thereby improving the safety of the vehicle and ensuring the normal driving of the vehicle.

[0120] The invention also provides an electrical device.

[0121] An electric device according to an embodiment of the present invention includes the battery pack 100 of the above embodiment.

[0122] According to the electric device of the embodiment of the present invention, by providing the above-mentioned battery pack 100, the normal operation of the electric device can be ensured, and the safety of the use of the electric device can be improved.

[0123] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0124] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: include: A cover body (1) and a tray (2), wherein the cover body (1) and the tray (2) are connected and together define a battery installation cavity (4); A battery module (3), the battery module (3) being installed in the battery installation cavity (4); A first inner buffer insulation layer (51) is provided between the battery module (3) and the cover (1), an outer buffer insulation layer is provided on the outside of the tray (2), and the outer buffer insulation layer is provided on the surface of the tray (2) facing away from the cover (1); The outer buffer insulation layer is constructed as a composite double-layer cotton (52), the composite double-layer cotton (52) comprising a second low-resilience foam (521) and a high-resilience foam (522), the second low-resilience foam (521) being connected to the surface of the tray (2), and the high-resilience foam (522) being connected to a side of the second low-resilience foam (521) facing away from the tray (2); The high-resilience foam (522) is provided with a first crust (5221) on a side facing away from the second low-resilience foam (521); And / or, the second low-resilience foam (521) is provided with a second crust (5211) on a side facing away from the high-resilience foam (522), and the second crust (5211) is adhered to the surface of the tray (2).

2. The battery pack according to claim 1, wherein: The thickness of the second low-resilience foam (521) is greater than the thickness of the high-resilience foam (522); And / or, the thickness h of the composite double-layer cotton (52) satisfies: 4mm≤h≤15mm; And / or, the compression rate a of the composite double-layer cotton (52) satisfies: 0%<a≤50%.

3. The battery pack according to claim 1, wherein: A plurality of first micropores (5212) are formed in each of the second low-resilience foams (521), and two adjacent ones of the plurality of first micropores (5212) are connected via an interconnecting hole (5213).

4. The battery pack according to claim 3, wherein: The diameter d1 of the first microhole (5212) satisfies: 0.5mm≤d1≤1.5mm; And / or, the water absorption rate of the second low-resilience foam (521) is less than 1%.

5. The battery pack according to claim 4, characterized in that: Second micropores (5222) are formed in the high-resilience foam (522), and there are a plurality of second micropores (5222), and the plurality of second micropores (5222) are closed to each other.

6. The battery pack according to claim 5, characterized in that: The diameter of the first micropore (5212) is greater than the diameter of the second micropore (5222).

7. The battery pack according to claim 1, wherein: It also includes a bottom guard plate (6), which is arranged below the tray (2), and the outer buffer insulation layer is located between the lower surface of the tray (2) and the bottom guard plate (6).

8. The battery pack according to claim 1, wherein: A second inner buffer insulation layer (53) is provided between the battery module (3) and the inner side surface of the tray (2).

9. The battery pack according to claim 8, characterized in that: A plastic layer (54) is further provided between the battery module (3) and the second inner buffer insulation layer (53).

10. The battery pack according to claim 8, wherein: The second inner buffer thermal insulation layer (53) is an annular layer, and the second inner buffer thermal insulation layer (53) is arranged around the battery module (3); Alternatively, there are multiple second inner buffer thermal insulation layers (53), and the multiple second inner buffer thermal insulation layers (53) are respectively arranged on multiple side surfaces of the battery module (3) in a one-to-one correspondence.

11. The battery pack according to claim 1, wherein: The outer side of the tray (2) is also provided with a heat insulation layer (55).

12. The battery pack according to claim 11, wherein: The heat insulation layer (55) is an annular layer, and the heat insulation layer (55) is arranged around the tray (2); Alternatively, there are multiple heat insulation layers (55), and the multiple heat insulation layers (55) are respectively arranged on multiple side surfaces of the tray (2) in a one-to-one correspondence.

13. The battery pack according to claim 11, wherein: The heat insulation layer (55) is constructed of one of high-resilience PO cotton, EMDM cotton and PU cotton.

14. A vehicle, characterized in that: The vehicle comprises a vehicle body floor (7), an exhaust pipe (8), and a battery pack according to any one of claims 1 to 13, wherein the battery pack is connected below the vehicle body floor (7), and the exhaust pipe (8) is located on one side of the battery pack.

15. An electrical device, characterized in that: A battery pack comprising the battery pack according to any one of claims 1 to 13.

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