Battery pack, vehicle and electric equipment

Abstract

The invention discloses a battery pack, a vehicle and electric equipment, and relates to the technical field of batteries, the battery pack comprises a cover body and a tray, and the cover body and the tray are connected and jointly define a battery mounting cavity; the battery module is mounted in the battery mounting cavity; wherein a first inner buffer thermal insulation layer is arranged between the battery module and the cover body. According to the battery pack, the occupied space is small, effective protection and heat preservation of the battery module can be achieved, and the service life of the battery is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, 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 the related art, a battery thermal insulation cotton is disposed between a battery tray and a vehicle body floor. There is a certain compression amount in the thermal insulation cotton, resulting in problems of large space occupation in the vertical direction and unstable vehicle body, as well as 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. For this purpose, the present invention provides a battery pack, which occupies a small space, can effectively protect and thermally insulate a battery module, and prolong the service life of the battery.

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

[0005] According to the battery pack of the embodiment of the present invention, by providing a first inner buffer thermal insulation layer between the battery module and the cover body, the buffering ability of the battery pack in the vertical direction is enhanced, effective protection of the battery module is achieved, and the first inner buffer thermal insulation layer is disposed inside the battery installation cavity, without occupying extra space, improving the structural compactness of the battery pack. At the same time, the battery module is thermally insulated, avoiding capacity reduction or starting difficulty of the battery module caused by low temperature, reducing the risk of overheating of the battery module, prolonging the battery life, and further improving the structural stability and safety of the battery pack in the vertical direction, so that the battery pack has a temperature equalization performance in all climates (normal temperature, high temperature, low temperature).

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

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

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

[0009] According to 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 a side of the second low resilience foam facing away from the tray.

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

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

[0012] For the battery pack according to 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 communication holes.

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

[0014] For the battery pack according to some embodiments of the present invention, second micropores are formed in the high-resilience foam, the second micropores are multiple, and the multiple second micropores are mutually closed.

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

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

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

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

[0019] For the battery pack according to some embodiments of the present invention, the second inner buffer and thermal insulation layer is an annular layer, and the second inner buffer and thermal insulation layer is arranged around the battery module; or, the second inner buffer and thermal insulation layer is multiple, and the multiple second inner buffer and thermal insulation layers are respectively provided on multiple sides of the battery module one by one.

[0020] For the battery pack according to some embodiments of the present invention, a heat insulation layer is further provided outside the tray.

[0021] For a battery pack according to some embodiments of the present invention, the heat insulation layer is an annular layer, and the heat insulation layer is disposed around the tray; alternatively, there are a plurality of the heat insulation layers, and the plurality of heat insulation layers are respectively disposed on a plurality of sides of the tray one by one.

[0022] For a battery pack according to some embodiments of the present invention, the heat insulation layer is configured as one of high resilience PO cotton, EMDM cotton, and PU cotton.

[0023] The present invention also provides a vehicle.

[0024] For a vehicle according to an embodiment of the present invention, it includes a vehicle body floor, an exhaust pipe, and the battery pack according to any one of the above embodiments. 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 present invention also provides an electrical device.

[0026] For an electrical device according to an embodiment of the present invention, it includes the battery pack according to the above embodiment.

[0027] The advantages of the vehicle, the electrical device, and the above battery pack over the prior art are the same, and will not be elaborated herein.

[0028] The additional aspects and advantages of the present invention will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0029] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, wherein: Figure 1 is a cross-sectional view of a battery pack according to an embodiment of the present invention; Figure 2 is a schematic structural view of a composite double-layer cotton according to an embodiment of the present invention; Figure 3 is a schematic structural view of a second low-resilience foam according to an embodiment of the present invention; Figure 4 is a schematic structural view of a high-resilience foam according to an embodiment of the present invention.

[0030] Reference Numerals: Battery pack 100, Cover body 1, Tray 2, Battery module 3, Battery installation cavity 4, The first inner buffer insulation layer 51, composite double-layer cotton 52, second low-resilience foam 521, second skin 5211, first micropores 5212, communication holes 5213, high-resilience foam 522, first skin 5221, second micropores 5222, second inner buffer insulation layer 53, plastic layer 54, heat insulation layer 55 Bottom guard plate 6, vehicle body floor 7, exhaust pipe 8 Specific implementation manners

[0031] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plural" is two or more. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Unless otherwise specified, the front-rear direction in this application is the longitudinal direction of the vehicle, i.e., the X direction; the left-right direction is the transverse direction of the vehicle, i.e., the Y direction; and the up-down direction is the vertical direction of the vehicle, i.e., the Z direction.

[0034] The following refers to Figures 1 to 4 Describe the battery pack 100 according to an embodiment of the present invention. The battery pack 100 occupies a small space, can effectively protect and insulate the battery module 3, and extend the service life of the battery.

[0035] As shown Figures 1 to 4 In the battery pack 100 according to an embodiment of the present invention, as shown, it includes a cover body 1, a tray 2, and a battery module 3.

[0036] The cover body 1 is connected to the tray 2 and together they define a battery installation cavity 4. That is, the inside of the tray 2 can be hollow and open on one side, and the cover body 1 can be covered on the open side of the tray 2 to close the tray 2. Thus, the cover body 1 and the tray 2 can together define a closed battery installation cavity 4. Or, as shown in the reference attachment Figure 1 In the figure, the inside of the tray 2 can be hollow and open on one side, and the inside 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 through a connecting flange. Thus, the inside of the tray 2 is in communication with the inside of the cover body 1. The cover body 1 and the tray 2 together define a closed battery installation cavity 4, and the cover body 1 and the tray 2 can also be connected through a sealing member, a connecting member, etc. to improve the connection stability and reliability between the cover body 1 and the tray 2 and improve the sealing performance of the battery installation cavity 4.

[0037] The battery module 3 is the core unit of the battery pack 100 and is composed of a plurality of battery cells combined in series or in parallel. The battery module 3 supports high-power output and endurance requirements, and through the battery module 3, the power requirements of vehicles, energy storage systems, etc. can be met. The battery module 3 is installed in the battery installation cavity 4. That is, the shape of the battery installation cavity 4 is adapted to the shape and size of the battery module 3. Thus, the battery module 3 can be stably installed in the battery installation cavity 4, and the cover body 1 and the tray 2 are used to effectively protect the battery module 3 against external impacts, squeezes, etc. and protect the battery module 3 from being damaged.

[0038] Among them, 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 body 1 is mainly used to close the battery installation cavity 4 to ensure the sealing performance of the battery installation cavity 4. Thus, it can prevent external moisture, dust, salt spray, etc. from invading the battery installation cavity 4, thereby preventing the battery module 3 from being damaged. Furthermore, a first inner buffer and heat insulation layer 51 is provided between the battery module 3 and the cover body 1, and an outer buffer and heat insulation layer is provided on the outside of the tray 2.

[0039] That is to say, the first inner buffer and heat insulation layer 51 is arranged in the battery installation cavity 4 and between the battery module 3 and the cover body 1. That is, one side surface of the first inner buffer and heat insulation layer 51 is attached to the cover body 1, and the other opposite surface of the first inner buffer and heat insulation layer 51 is attached to the battery module 3. Refer to the reference attachment Figure 1As shown, the first inner buffer insulation layer 51 is horizontally arranged. In this way, 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 the buffering effect, thereby enhancing the buffering ability 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, achieving effective protection for the battery module 3, and the first inner buffer insulation layer 51 is arranged inside the battery installation cavity 4 without occupying extra space, improving 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, 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, thus avoiding the capacity reduction or starting difficulty of the battery module 3 caused by low temperature, reducing the overheating risk of the battery module 3, and extending the battery life.

[0040] Thus, by arranging 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, and the battery pack 100 has a temperature equalization performance in all climates (normal temperature, high temperature, low temperature).

[0041] For the battery pack 100 according to the embodiment of the present invention, by arranging the first inner buffer insulation layer 51 between the battery module 3 and the cover body 1, the buffering ability of the battery pack 100 in the vertical direction is enhanced, effective protection for the battery module 3 is achieved, and the first inner buffer insulation layer 51 is arranged inside the battery installation cavity 4 without occupying extra space, improving the structural compactness of the battery pack 100. At the same time, the battery module 3 is insulated, avoiding the capacity reduction or starting difficulty of the battery module 3 caused by low temperature, reducing the overheating risk of the battery module 3, and extending the battery life. Furthermore, the structural stability and safety of the battery pack 100 in the vertical direction are improved, and the battery pack 100 has a temperature equalization performance in all climates (normal temperature, high temperature, low temperature).

[0042] In some embodiments, an outer buffer insulation layer is provided outside the tray 2.

[0043] Specifically, the outer buffer and thermal insulation layer is arranged outside the battery installation cavity 4. The outer buffer and thermal insulation layer can play a role in resisting bottom impact and thermal insulation for the battery module 3. The outer buffer and thermal insulation layer can be horizontally arranged. In this way, when the battery pack 100 is subjected to an impact force from the bottom, the outer buffer and thermal insulation layer can effectively resist the external impact force, 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 for the battery module 3. At the same time, the outer buffer and thermal insulation layer can keep the battery module 3 warm, further 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 further avoiding the capacity decline or starting difficulty of the battery module 3 caused by low temperature, further reducing the overheating risk of the battery module 3, and further extending the battery life.

[0044] Thus, by arranging buffer and thermal insulation layers 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, enabling the battery pack 100 to have better temperature equalization performance in all climates (normal temperature, high temperature, low temperature).

[0045] In some embodiments, the outer buffer and thermal insulation layer is arranged on the surface of the tray 2 facing away from the cover 1.

[0046] Specifically, as Figure 1 shown, the outer buffer and thermal insulation layer is horizontally arranged on the surface of the tray 2 facing away from the cover 1, that is, on the bottom surface of the tray 2. Thus, the outer buffer and thermal insulation layer can fit the lower surface of the cover 1, thereby effectively resisting the impact force from the bottom of the tray 2, realizing effective protection for the battery module 3, and preventing external heat from being transmitted to the inside of the battery pack 100, realizing thermal insulation for the battery module 3, and preventing the battery pack 100 from overheating and getting cold.

[0047] In some embodiments, the outer buffer and thermal insulation layer is configured as a first low-resilience foam.

[0048] Specifically, the first low-resilience foam has the characteristics of slow recovery after being compressed and deformed, thermal insulation, buffering and vibration damping, chemical corrosion resistance, convenient processing, sound insulation and noise reduction, etc. Thus, by configuring the outer buffer and thermal insulation layer as the first low-resilience foam, the vibration or impact energy can be effectively absorbed, the buffering effect can be enhanced, the battery module 3 can be protected from impact damage, and the heat transfer efficiency can be reduced to achieve heat insulation, which is beneficial to maintaining the stability of the temperature inside the battery pack 100, reducing the influence of the external environment on the battery module 3, and having a slow deformation, which can evenly disperse the pressure, avoid local pressure concentration, reduce the risk of damage to the battery module 3, and is convenient for installation outside the tray 2.

[0049] Alternatively, the outer buffer and thermal insulation layer is configured as a composite double-layer cotton 52.

[0050] Specifically, the composite double-layer cotton 52 is formed by stacking two cotton layers with different densities or materials to achieve complementary physical properties. For example, one layer can be a low-density cotton layer to disperse pressure, enhance heat preservation, and facilitate installation, while the other layer can be a high-density cotton layer to enhance the anti-external impact performance, improve the support ability and inhibit deformation, and effectively absorb the impact force.

[0051] Thus, by constructing the outer buffer heat preservation layer as the composite double-layer cotton 52, the effects of heat insulation and resistance to external impact can be better achieved.

[0052] 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.

[0053] Specifically, as Figure 2 shown, 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 can effectively absorb vibration or impact energy, enhance the buffering effect, avoid impact damage to the battery module 3, and can reduce the heat transfer efficiency, achieve heat insulation, facilitate maintaining the internal temperature stability of the battery pack 100, reduce the influence of the external environment on the battery module 3, and deform slowly, can evenly disperse pressure, avoid local pressure concentration, and reduce the risk of damage to the battery module 3.

[0054] The high-resilience foam 522 has high resilience performance, is not easily deformed, has a fast recovery speed after deformation, is not easily damaged, can absorb mechanical vibration and impact energy, and has good softness and tensile resistance, so as to be able to effectively resist external impact.

[0055] Among them, as Figure 2 shown in the 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 Figure 1 shown, the upper surface of the second low-resilience foam 521 is connected to the lower surface of the tray 2 to achieve the functions of convenient installation and enhanced heat preservation effect. At the same time, the buffering effect is enhanced to prevent the impact force from being transmitted to the inside of the battery pack 100. The high-resilience foam 522 is connected to the side of the second low-resilience foam 521 facing away from the tray 2, that is, the lower surface of the second low-resilience foam 521. In this way, when receiving an impact force from the bottom direction of the battery pack 100, the high-resilience 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.

[0056] Thus, through the combined action of the second low-resilience foam 521 and the high-resilience foam 522, the heat insulation performance and the external impact resistance of the composite double-layer cotton 52 are effectively improved, achieving temperature stability inside the battery pack 100 and effective protection for the battery module 3.

[0057] In some embodiments, a first skin 5221 is provided on the side of the high-resilience foam 522 facing away from the second low-resilience foam 521.

[0058] Specifically, as Figure 4 shown, a first skin 5221 is provided on the side of the high-resilience foam 522 facing away from the second low-resilience foam 521, that is, Figure 1 on the lower side of the high-resilience foam 522 as shown in the middle direction. The first skin 5221 has a low porosity and can be used as a connecting layer to connect with other structures.

[0059] In other embodiments, a second skin 5211 is provided on the side of the second low-resilience foam 521 facing away from the high-resilience foam 522, and the second skin 5211 is attached to the surface of the tray 2.

[0060] Specifically, as Figure 3 shown, a second skin 5211 is provided on the side of the second low-resilience foam 521 facing away from the high-resilience foam 522, that is, Figure 1 on the upper side of the second low-resilience foam 521 as shown in the middle. The second skin 5211 can be attached to the lower surface of the tray 2 to connect the second low-resilience foam 521 with the tray 2. The second skin 5211 has a low porosity and can be used as a physical barrier layer to prevent the gas inside the second low-resilience foam 521 from discharging from the upper surface of the second low-resilience 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-resilience foam 521 is compressed, the gas will discharge from the side of the second low-resilience foam 521 instead of from the upper surface of the second low-resilience foam 521.

[0061] In some embodiments, the thickness of the second low-resilience foam 521 is greater than the thickness of the high-resilience foam 522.

[0062] Specifically, as Figure 2As shown, the thickness of the second low-resilience foam 521 is greater than that of the high-resilience foam 522. Thus, the heat insulation and buffering effects of the second low-resilience foam 521 can be enhanced, the heat insulation effect can be strengthened, effectively isolating the transfer of external heat to the interior of the battery pack 100. And when impacted, the low-thickness high-resilience foam 522, as the first protective layer, can rapidly deform and highly resilient to absorb most of the impact energy. The high-thickness second low-resilience foam 521 can slowly deform and have low resilience to absorb the remaining impact energy. Since the second low-resilience foam 521 is relatively thick, the energy absorption path can be extended to fully absorb the remaining impact energy and prevent the impact force from being transmitted to the interior of the battery pack 100.

[0063] In some other embodiments, the thickness h of the composite double-layer cotton 52 satisfies: 4mm ≤ h ≤ 15mm.

[0064] 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 heat insulation performance and external impact resistance are, but the occupied space will also increase correspondingly, especially the occupied dimension in the vertical direction increases, 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 heat insulation performance and external impact resistance are.

[0065] Thus, by setting the thickness h of the composite double-layer cotton 52 within the reasonable range of 4mm to 15mm, not only the heat insulation performance and external impact resistance of the composite double-layer cotton 52 are ensured, the risk of impact energy rebound is avoided, and the best use effect is achieved, but also the excessive space occupied by the composite double-layer cotton 52 is avoided.

[0066] In some other embodiments, the compression ratio a of the composite double-layer cotton 52 satisfies: 0% < a ≤ 50%.

[0067] That is to say, the compression ratio 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 ratio, the greater the compression amount the composite double-layer cotton 52 can withstand, so as to undergo deep deformation to absorb a large amount of impact energy. However, if the compression ratio is too large, the rebound may be too slow, and after multiple impacts, the composite double-layer cotton 52 is prone to failure due to insufficient rebound. Correspondingly, the lower the compression ratio, the smaller the compression amount the composite double-layer cotton 52 can withstand, with stronger supporting force, but it may lead to insufficient absorption of impact energy and weakened heat insulation performance.

[0068] Thus, 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 impact energy, ensuring the heat preservation performance and external impact resistance of the composite double-layer cotton 52, and achieving the best use effect.

[0069] In some embodiments, a plurality of first micropores 5212 are formed in both the first low-resilience foam and the second low-resilience foam 521, and two adjacent ones of the plurality of first micropores 5212 are connected through an intercommunication hole 5213.

[0070] Specifically, as Figure 3 shown, a plurality of first micropores 5212 are formed in both the first low-resilience foam and the second low-resilience foam 521, and two adjacent ones of the plurality of first micropores 5212 are connected through an intercommunication hole 5213, so that the plurality of first micropores 5212 are all in a connected state. In this way, when the first low-resilience foam or the second low-resilience foam 521 is compressed, the gas inside the first low-resilience foam or the second low-resilience foam 521, that is, the gas in the plurality of first micropores 5212, will flow through the intercommunication hole 5213 to achieve a buffering effect, and flow to the side of the first low-resilience foam or the second low-resilience foam 521 and be discharged from the side.

[0071] In some embodiments, the diameter d1 of the first micropore 5212 satisfies: 0.5 mm ≤ d1 ≤ 1.5 mm.

[0072] That is to say, the diameter d1 of the first micropore 5212 can be set to 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm 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, and 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-resilience foam and the second low-resilience 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 beneficial to improving the resilience of the first low-resilience foam and the second low-resilience foam 521. However, if the diameter d1 of the first micropore 5212 is too small, it will result in the inability to effectively absorb vibration and impact energy.

[0073] Thus, by setting the diameter d1 of the first micro-hole 5212 within a reasonable range of 0.5 mm to 1.5 mm, the first low-resilience foam and the second low-resilience foam 521 can maintain good resilience and anti-compression deformation ability, so that the vibration and impact energy can be fully absorbed. At the same time, the structural strength of the first low-resilience foam and the second low-resilience foam 521 is ensured to be relatively high.

[0074] In some other embodiments, the water absorption rates of the first low-resilience foam and the second low-resilience foam 521 are both less than 1%.

[0075] That is to say, the water absorption rates of the first low-resilience foam and the second low-resilience foam 521 can be set to 0%, 0.5%, 0.8%, etc. In other words, the first low-resilience foam and the second low-resilience foam 521 are in a water-repellent form. In this way, the water absorption ability of the first low-resilience foam and the second low-resilience foam 521 is poor, which can enhance the durability of the first low-resilience foam and the second low-resilience foam 521, and can also maintain the original performance and shape during long-term use, which is beneficial to use in a humid environment.

[0076] In some embodiments, a second micro-hole 5222 is formed in the high-resilience foam 522, and there are multiple second micro-holes 5222, and the multiple second micro-holes 5222 are mutually closed.

[0077] Specifically, as Figure 4 shown, a second micro-hole 5222 is formed in the high-resilience foam 522, and there are multiple second micro-holes 5222, and the multiple second micro-holes 5222 are mutually closed, that is, the multiple second micro-holes 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 micro-holes 5222, cannot be discharged, so as to quickly absorb the impact energy. When the pressure is unloaded, the high-resilience foam 522 will return to its original state.

[0078] In some embodiments, the diameter of the first micro-hole 5212 is greater than the diameter of the second micro-hole 5222.

[0079] That is to say, the size of the first micro-hole 5212 is greater than the size of the second micro-hole 5222. Thus, the small micro-hole structure of the high-resilience foam 522 can make the high-resilience foam 522 disperse the pressure more evenly when compressed and quickly return to its original state when the pressure is released, thereby improving the resilience of the high-resilience foam 522. At the same time, the structural strength of the high-resilience foam 522 is enhanced, and the large micro-hole structure of the first low-resilience foam and the second low-resilience foam 521 can enhance the buffering effect.

[0080] Thus, in the composite double-layer cotton 52, the small micropore structure of the high-resilience foam 522 and the large micropore structure of the second low-resilience foam 521 complement each other. The small micropore structure of the high-resilience layer is used for rapid support and energy dispersion, and the large micropore structure of the low-resilience layer is used for providing deep buffering, thereby realizing effective heat preservation and protection for the battery module 3.

[0081] In some embodiments, the battery pack 100 further includes a bottom guard plate 6. The bottom guard plate 6 is disposed below the tray 2, and the outer buffer heat-insulating layer is located between the lower surface of the tray 2 and the bottom guard plate 6.

[0082] Specifically, as Figure 1 shown, the battery pack 100 further includes a bottom guard plate 6. The bottom guard plate 6 is arranged below the tray 2, and the outer buffer heat-insulating 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 applied to a vehicle, the bottom guard plate 6 can prevent the battery pack 100 from being impacted by obstacles such as road surface gravel, prevent the battery pack 100 from being damaged, and effectively support the bottom of the battery pack 100, improving the overall structural strength of the battery pack 100.

[0083] By arranging the outer buffer heat-insulating 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, improving the structural strength in the vertical direction, reducing the impact energy transmitted upward, thereby realizing the protection of the battery module 3. At the same time, the temperature dissipated from the bottom of the battery pack 100 is reduced.

[0084] In some embodiments, a second inner buffer heat-insulating layer 53 is provided between the battery module 3 and the inner side surface of the tray 2.

[0085] Specifically, as Figure 1 shown, a second inner buffer heat-insulating layer 53 is arranged between the battery module 3 and the inner side surface of the tray 2. The second inner buffer heat-insulating layer 53 is vertically arranged. The second inner buffer heat-insulating layer 53 can buffer and provide heat insulation for the battery module 3 in the horizontal direction. When the battery pack 100 is subjected to an impact force in the horizontal direction, the second inner buffer heat-insulating layer 53 can absorb the impact force to achieve a buffering effect, thereby enhancing the buffering ability of the battery pack 100 in the horizontal direction, further effectively protecting the battery module 3, preventing the battery module 3 from being damaged by the impact force in the horizontal direction. At the same time, the second inner buffer heat-insulating layer 53 can insulate the battery module 3, reducing the loss of the internal temperature of the battery pack 100, thereby further avoiding the capacity decline or starting difficulty of the battery module 3 caused by low temperature, and further extending the battery life.

[0086] In some embodiments, a plastic layer 54 is further provided between the battery module 3 and the second inner buffer heat-insulating layer 53.

[0087] Specifically, as Figure 1As shown, a plastic layer 54 is further provided between the battery module 3 and the second inner buffer heat-insulating layer 53. The plastic layer 54 is arranged vertically. The plastic layer 54 can cooperate with the second inner buffer heat-insulating layer 53 to stably install the battery module 3 in the tray 2, preventing the battery module 3 from shaking, shifting, etc., which may cause wear and damage to the battery module 3.

[0088] In some embodiments, the second inner buffer heat-insulating layer 53 is an annular layer, and the second inner buffer heat-insulating layer 53 is arranged around the battery module 3.

[0089] Thus, buffering and heat-insulating effects can be achieved on the entire circumference of the battery module 3, preventing the internal temperature of the battery pack 100 from dissipating from any side in the horizontal direction, such as from the left, right, front or right side, and preventing the impact force from any side in the horizontal direction from damaging the battery module 3. Moreover, the annular second inner buffer heat-insulating layer 53 is easy to manufacture and convenient for quick installation.

[0090] Alternatively, there are multiple second inner buffer heat-insulating layers 53, and the multiple second inner buffer heat-insulating layers 53 are respectively arranged on multiple sides of the battery module 3 in a one-to-one correspondence.

[0091] That is to say, the second inner buffer heat-insulating layer 53 can be set to two, three, four or more. For example, the second inner buffer heat-insulating layer 53 can be set to four, and the four second inner buffer heat-insulating layers 53 can be respectively arranged on the left, right, front and right sides of the battery module 3 in a one-to-one correspondence to achieve buffering and heat-insulating effects on the entire circumference of the battery module 3. In this way, when one of the second inner buffer heat-insulating layers 53 is damaged or fails, this second inner buffer heat-insulating layer 53 can be disassembled and replaced, instead of replacing the entire second inner buffer heat-insulating layer 53, which is flexible and convenient.

[0092] In some embodiments, a heat-insulating layer 55 is further provided on the outer side of the tray 2.

[0093] Specifically, as Figure 1 shown, a heat-insulating layer 55 is further provided on the outer side of the tray 2. The heat-insulating layer 55 is arranged vertically and fits on the outer surface of the tray 2. The heat-insulating layer 55 can buffer, heat-insulate and protect the battery module 3 in the horizontal direction. When the battery pack 100 is subjected to an impact force in the horizontal direction, the outer buffer heat-insulating layer can absorb the impact force to achieve a buffering effect, thereby enhancing the buffering ability of the battery pack 100 in the horizontal direction and further effectively protecting the battery module 3 from being damaged by the impact force in the horizontal direction. At the same time, the outer buffer heat-insulating layer can isolate the heat from the external environment, effectively preventing the heat from the outside 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.

[0094] Thus, through the arrangement of the heat insulation layer 55, the plastic layer 54, the first inner buffer heat insulation layer 51, the outer buffer heat insulation layer, and the second inner buffer heat insulation layer 53, the battery pack 100 is buffered and heat-insulated in both the horizontal and vertical directions, enabling the battery pack 100 to have excellent impact resistance, heat preservation, and heat insulation performance.

[0095] In some embodiments, the heat insulation layer 55 is an annular layer that surrounds the tray 2.

[0096] Thus, heat insulation can be provided to the entire circumference of the battery module 3, preventing heat from the external environment from being transferred into the battery pack 100 from any side in the horizontal direction, such as from the left, right, front, or rear, and preventing the impact force from any side in the horizontal direction from being transferred into the battery pack 100 and damaging the battery module 3. Moreover, the annular heat insulation layer 55 is easy to manufacture and convenient for quick installation.

[0097] Alternatively, there are multiple heat insulation layers 55, and the multiple heat insulation layers 55 are respectively provided on multiple sides of the tray 2 in a one-to-one correspondence.

[0098] That is to say, the heat insulation layer 55 can be set to two, three, four, or more. For example, the heat insulation layer 55 can be set to four, and the four heat insulation layers 55 can be respectively provided on the left, right, front, and rear outsides of the tray 2 in a one-to-one correspondence to provide heat insulation to the entire circumference of the battery pack 100. In this way, when one of the heat insulation layers 55 is damaged or fails, this heat insulation layer 55 can be disassembled and replaced without replacing the entire heat insulation layer 55, which is flexible and convenient.

[0099] In some embodiments, the heat insulation layer 55 is configured as one of high resilience PO cotton, EMDM cotton, and PU cotton.

[0100] Specifically, high resilience 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 resilience PO cotton has the characteristics of super strong resilience and deformation recovery ability, a wide temperature resistance range, moisture-proof and mildew-proof properties, and the ability to absorb impact energy. By configuring the heat insulation layer 55 as high resilience PO cotton, while effectively isolating external heat, its own performance can be ensured to be stable, and it can efficiently absorb impact energy to prevent external impact energy from being transferred into the battery pack 100.

[0101] EMDM cotton is a foaming 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 heat insulation layer 55 as EMDM cotton, it can effectively isolate external heat, ensure the stability of its own performance, provide effective insulation protection for the battery pack 100, and can efficiently absorb impact energy to prevent the external impact energy from being transmitted to the inside of the battery pack 100, thus extending the service life of the heat insulation layer 55.

[0102] PU cotton (polyurethane foam) is a high-performance foaming material. PU cotton has excellent elasticity and resilience, excellent sound insulation and heat insulation capabilities, excellent wear resistance and aging resistance, excellent chemical corrosion resistance, etc. By constructing the heat insulation layer 55 as PU cotton, it can greatly improve the heat insulation ability of the heat insulation layer 55, extend the service life of the heat insulation layer 55, and fully absorb impact energy.

[0103] Therefore, by constructing the heat insulation layer 55 as one of high-resilience PO cotton, EMDM cotton, and PU cotton, the heat insulation layer 55 can have high heat resistance and high bonding performance, with a heat resistance temperature between 95°C and 200°C, improve the heat insulation performance of the heat insulation layer 55, facilitate connection to the outer surface of the tray 2, and effectively absorb impact energy.

[0104] The present invention also proposes a vehicle.

[0105] The vehicle according to an embodiment of the present invention includes a vehicle body floor 7, an exhaust pipe 8, and the battery pack 100 of 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.

[0106] The vehicle of this embodiment can be a hybrid vehicle, a pure electric vehicle, an extended-range electric vehicle, etc. Taking a hybrid vehicle as an example for illustration.

[0107] Specifically, as Figure 1 shown, the battery pack 100 is connected below the vehicle body floor 7, the exhaust pipe 8 is located on one side of the battery pack 100. The exhaust pipe 8 has a relatively high temperature, and its heat will be transmitted to the battery pack 100, causing damage to the battery pack 100. By arranging the high-temperature-resistant heat insulation layer 55 on the outside of the tray 2, it can effectively isolate the heat damage of the exhaust pipe 8 and play a role in keeping the battery pack 100 at a low temperature.

[0108] Therefore, through the setting of the inner buffer heat insulation layer, the outer buffer heat insulation layer, and the external heat insulation layer 55, the hybrid vehicle has structural stability and the temperature equalization 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.

[0109] The present invention also provides an electrical device.

[0110] The electrical device according to an embodiment of the present invention includes the battery pack 100 of the above embodiment.

[0111] By providing the battery pack 100 as described above, the electrical device according to an embodiment of the present invention can ensure the normal operation of the electrical device and improve the safety in use of the electrical device.

[0112] In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In the present specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0113] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that, Comprising: A cover body (1) and a tray (2), the cover body (1) is connected to the tray (2) and jointly defines a battery installation cavity (4); A battery module (3), the battery module (3) is installed in the battery installation cavity (4); Wherein, a first inner buffer and heat insulation layer (51) is provided between the battery module (3) and the cover body (1).

2. The battery pack according to claim 1, wherein, An outer buffer and heat insulation layer is provided outside the tray (2).

3. The battery pack according to claim 2, characterized in that, The outer buffer and heat insulation layer is provided on the surface of the tray (2) facing away from the cover body (1).

4. The battery pack according to claim 3, characterized in that, The outer buffer and heat insulation layer is configured as a first low resilience foam; Or, the outer buffer and heat insulation layer is configured as a composite double-layer cotton (52).

5. The battery pack according to claim 4, wherein, 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).

6. The battery pack according to claim 5, characterized in that, The high resilience foam (522) is provided with a first skin (5221) on the side facing away from the second low resilience foam (521); And / or, the second low resilience foam (521) is provided with a second skin (5211) on the side facing away from the high resilience foam (522), and the second skin (5211) fits on the surface of the tray (2).

7. The battery pack according to claim 5, 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%.

8. The battery pack according to claim 5, wherein A plurality of first micropores (5212) are formed in both the first low resilience foam and the second low resilience foam (521), and adjacent two of the plurality of first micropores (5212) are communicated through communication holes (5213).

9. The battery pack according to claim 8, wherein The diameter d1 of the first micropores (5212) satisfies: 0.5mm ≤ d1 ≤ 1.5mm; And / or, the water absorption rates of the first low resilience foam and the second low resilience foam (521) are both less than 1%.

10. The battery pack according to claim 8, wherein, A plurality of second micropores (5222) are formed in the high resilience foam (522), and the plurality of second micropores (5222) are mutually closed.

11. The battery pack according to claim 10, wherein, The diameter of the first micropores (5212) is greater than the diameter of the second micropores (5222).

12. The battery pack according to claim 3, characterized in that, It further includes a bottom guard plate (6), the bottom guard plate (6) is provided below the tray (2), and the outer buffer and heat insulation layer is located between the lower surface of the tray (2) and the bottom guard plate (6).

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

14. The battery pack according to claim 13, wherein A plastic layer (54) is further provided between the battery module (3) and the second inner buffer and heat insulation layer (53).

15. The battery pack according to claim 13, characterized in that, The second inner buffer and heat insulation layer (53) is an annular layer, and the second inner buffer and heat insulation layer (53) is arranged around the battery module (3); Alternatively, there are a plurality of the second inner buffer heat insulation layers (53), and the plurality of the second inner buffer heat insulation layers (53) are respectively disposed on a plurality of sides of the battery module (3) in a one-to-one correspondence.

16. The battery pack according to claim 1, wherein, An insulation layer (55) is further provided outside the tray (2).

17. The battery pack according to claim 16, characterized in that, The insulation layer (55) is an annular layer, and the insulation layer (55) is disposed around the tray (2); Alternatively, there are a plurality of the insulation layers (55), and the plurality of the insulation layers (55) are respectively disposed on a plurality of sides of the tray (2) in a one-to-one correspondence.

18. The battery pack according to claim 16, characterized in that, The insulation layer (55) is configured as one of high resilience PO cotton, EMDM cotton, and PU cotton.

19. A vehicle, characterized in that, It includes a vehicle body floor (7), an exhaust pipe (8), and the battery pack according to any one of claims 1-18. 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.

20. An electrical device, characterized in that, It includes the battery pack according to any one of claims 1-18.

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