Battery assembly, battery pack and electrical device

Abstract

Provided in the present application are a battery assembly, a battery pack, and an electrical device. The battery assembly comprises a battery and a heat absorbing member arranged on the surface of the battery; the heat absorbing member comprises a packaging portion and a heat absorbing portion, the packaging portion being internally provided with a sealed space, and the heat absorbing portion being arranged in the sealed space; the packaging portion comprises a packaging structure and a sealing structure, the packaging structure having an opening on one side, and the sealing structure being arranged at the opening to form the sealed space. On the surface of the battery facing the heat absorbing member, the maximum side length of the battery is Lbattery; in a direction perpendicular to the surface of the battery facing the heat absorbing member, the size of the heat absorbing portion is dabsorption; in a direction from the heat absorbing portion to the sealing structure, the size of the sealing structure is Wsealing, where the Lbattery, the dabsorption, and the Wsealing satisfy: 50 mm≤Lbattery×dabsorption / Wsealing≤200 mm.

Description

Battery assembly, battery pack and electric device

[0001] The present application claims priority to the Chinese patent application No. 202421527436.1, filed on June 28, 2024, and entitled "Battery assembly, battery pack and electric device", the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, in particular to a battery assembly, a battery pack and an electric device. BACKGROUND

[0003] Batteries provide power support for the use of electric devices. The temperature change of the battery during use also affects the use performance and safety of the battery and the electric device. Therefore, the heat-absorbing member can be used to absorb the heat of the battery, accelerate the heat transfer of the battery, reduce the temperature of the battery, and ensure the use of the electric device. In the related art, the four sides of the packaging member are often heat-sealed to fix the heat-absorbing material therein to form a heat-absorbing member. The heat-absorbing member often cannot balance the sealing performance and the heat-absorbing performance, which affects the use of the battery and the electric device. SUMMARY

[0004] In view of this, the present application provides a battery assembly, a battery pack and an electric device, wherein the packaging part is single-sided sealed and the sealing structure size is small, the heat-absorbing part ratio is large, and the heat-absorbing performance of the heat-absorbing member is excellent. The heat-absorbing member can effectively absorb the heat generated by the battery under the premise of ensuring sealing, reduce the temperature of the battery assembly and the battery pack, improve the safety of the battery assembly and the battery pack, and improve the use performance of the electric device.

[0005] In a first aspect, the present application provides a battery assembly, comprising a battery and a heat-absorbing member arranged on the surface of the battery, the heat-absorbing member comprising a packaging part and a heat-absorbing part, the packaging part having a sealed space inside, the heat-absorbing part being arranged in the sealed space, the packaging part comprising a packaging structure and a sealing structure, the packaging structure being open on one side, and the sealing structure being arranged at the opening to form the sealed space.

[0006] The maximum side length of the battery facing the surface of the heat-absorbing member is L 电 ,

[0007] In a direction perpendicular to the surface of the battery facing the heat-absorbing member, the size of the heat-absorbing part is d 吸 ,

[0008] In the direction from the heat-absorbing part to the sealing structure, the size of the sealing structure is W 密 ,

[0009] The L 电, the d 吸 , the W 密 , the L 电 , the d 吸 , the W 密 ≤ 200 mm.

[0010] Optionally, a volume of the sealed space is V 密 , a volume of the heat-absorbing part is V 吸 , the V 密 , the V 吸 satisfy: 90% ≤ V 吸 / V 密 ≤ 98%.

[0011] Optionally, the V 密 , the V 吸 satisfy: 91.7% ≤ V 吸 / V 密 ≤ 95%.

[0012] Optionally, a length of the sealed space is L 空 , a width of the sealed space is W 空 , a length of the heat-absorbing part is L 吸 , a width of the heat-absorbing part is W 吸 , the L 空 , the L 吸 , the W 空 , the W 吸 satisfy: 1 mm ≤ L 空 -L 吸 ≤ 10 mm; and / or 1 mm ≤ W 空 -W 吸 ≤ 5 mm.

[0013] Optionally, the L 空 , the L 吸 , the W 空 , the W 吸 satisfy: 2 mm ≤ L 空 -L 吸 ≤ 10 mm; and / or 4 mm ≤ W 空 -W 吸 ≤ 5 mm.

[0014] Optionally, the battery assembly satisfies at least one of the following (a), (b) and (c): (a) the L 电 is 500 mm to 1200 mm; (b) the d 吸 is 0.5 mm to 50 mm; (c) the W 密 is 2 mm to 20 mm.

[0015] Optionally, the battery assembly satisfies: the L 电500mm to 1000mm; and / or the d 吸 0.5mm to 5mm.

[0016] Optionally, a surface of the heat-absorbing member facing the battery has a first direction in which the maximum side length of the heat-absorbing member extends, and the sealing structure is located at one end of the packaging structure in the first direction.

[0017] Optionally, the packaging structure comprises a corrosion-resistant layer, a metal layer disposed on a side surface of the corrosion-resistant layer facing away from the heat-absorbing portion, and an insulating layer disposed on a side surface of the metal layer facing away from the corrosion-resistant layer.

[0018] Optionally, the sealing structure comprises a corrosion-resistant layer, a metal layer disposed on a side surface of the corrosion-resistant layer facing away from the heat-absorbing portion, and an insulating layer disposed on a side surface of the metal layer facing away from the corrosion-resistant layer.

[0019] Optionally, at least one of the packaging structure and the sealing structure satisfies at least one of the following (d), (e), (f), and (g): (d) the thickness of the corrosion-resistant layer is 30μm to 150μm; (e) the thickness of the metal layer is 3μm to 20μm; (f) the thickness of the insulating layer is 5μm to 20μm; and (g) the thickness of the packaging portion is 30μm to 100μm.

[0020] Optionally, at least one of the packaging structure and the sealing structure satisfies at least one of the following (h), (i), and (j): (h) the corrosion-resistant layer comprises at least one of a polypropylene layer and a polyethylene layer; (i) the metal layer comprises at least one of an aluminum layer, an aluminum alloy layer, a copper layer, a copper alloy layer, a zinc layer, and a zinc alloy layer; and (j) the insulating layer comprises at least one of a polyethylene terephthalate layer and a polybutylene terephthalate layer.

[0021] Optionally, the water vapor transmission rate of the packaging portion is less than or equal to 0.02g / (m 2 ·24h).

[0022] Optionally, the heat-absorbing portion comprises a skeleton and a heat-absorbing material, the skeleton has a hole, and the heat-absorbing material is disposed in the hole.

[0023] Optionally, the heat-absorbing portion satisfies at least one of the following (k), (l), (m), and (n): (k) the thickness of the skeleton is 0.1mm to 10mm; (l) the pore size of the hole is 3mm to 4mm; (m) the skeleton comprises a polypropylene skeleton; and (n) the heat-absorbing material comprises a phase change material.

[0024] Optionally, the battery is a cuboid; the L 电The length of the battery; the direction perpendicular to the surface of the battery facing the heat-absorbing member is parallel to the thickness direction of the battery; the length of the battery is greater than the thickness of the battery.

[0025] Optionally, the heat-absorbing member is a cuboid, and the direction from the heat-absorbing part to the sealing structure is the length direction of the heat-absorbing member.

[0026] In a second aspect, the present application provides a battery pack comprising the battery assembly of the first aspect.

[0027] Optionally, the battery pack comprises a plurality of the battery assemblies, and the plurality of the battery assemblies comprise a plurality of the batteries and a plurality of the heat-absorbing members, and the plurality of the batteries and the plurality of the heat-absorbing members are alternately and spacedly arranged.

[0028] In a third aspect, the present application provides a power-consuming device comprising the battery pack of the second aspect.

[0029] The sealing space and the heat-absorbing part of the battery assembly provided by the present application have a reasonable proportion, which helps to improve the heat-absorbing performance of the heat-absorbing member under the premise of ensuring sealing, so as to effectively absorb the heat generated by the battery, reduce the temperature of the battery assembly, realize heat dissipation of the battery, improve the safety of the battery assembly, and ensure the use of the battery. The battery pack with the battery assembly has excellent heat-absorbing performance, safety and use performance. The power-consuming device with the battery pack has excellent safety and use performance, and strong product competitiveness. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be described below.

[0031] FIG. 1 is a structural schematic view of a battery assembly provided by an embodiment of the present application.

[0032] FIG. 2 is a sectional schematic view of the heat-absorbing member in the A-A direction in FIG. 1.

[0033] FIG. 3 is a sectional schematic view of a packaging part provided by an embodiment of the present application.

[0034] FIG. 4 is a sectional schematic view of a sealing structure provided by an embodiment of the present application.

[0035] FIG. 5 is an enlarged view of the dashed line area in FIG. 4.

[0036] FIG. 6 is a structural schematic view of a framework provided by an embodiment of the present application.

[0037] FIG. 7 is a sectional schematic view of a battery assembly provided by an embodiment of the present application.

[0038] Fig. 8 is a structural schematic diagram of a battery pack according to an embodiment of the present application.

[0039] Label explanation: packaging part-10, packaging structure-11, opening-110, corrosion-resistant layer-111, metal layer-112, insulation layer-113, sealing structure-12, sealing space-13, heat absorption part-20, framework-21, hole-211, heat absorption member-100, battery-200, battery body-201, positive pole-202, negative pole-203, battery assembly-300, battery pack-400. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0041] The present application provides a battery assembly. Referring to Figs. 1-4, Fig. 1 is a structural schematic diagram of a battery assembly according to an embodiment of the present application, Fig. 2 is a sectional schematic diagram of a heat absorption member in the direction of A-A in Fig. 1, Fig. 3 is a sectional schematic diagram of a packaging part according to an embodiment of the present application, and Fig. 4 is a sectional schematic diagram of a packaging structure according to an embodiment of the present application. The battery assembly 300 comprises a battery 200 and a heat absorption member 100 arranged on the surface of the battery 200. The heat absorption member 100 comprises a packaging part 10 and a heat absorption part 20. The packaging part 10 has a sealing space 13 inside. The heat absorption part 20 is arranged in the sealing space 13. The packaging part 10 comprises a packaging structure 11 and a sealing structure 12. The packaging structure 11 has a single opening (i.e., only one opening 110 on one side). The sealing structure 12 is arranged in the opening 110 to form the sealing space 13. On the surface of the battery 200 facing the heat absorption member 100, the maximum side length of the battery 200 is L 电 , the size of the heat absorption part 20 in the direction perpendicular to the surface of the battery 200 facing the heat absorption member 100 (i.e., in the direction perpendicular to the surface of the battery 200 facing the heat absorption member 100) is d 吸 , and the size of the sealing structure 12 in the direction from the heat absorption part 20 to the sealing structure 12 is W 密 . L 电 , d 吸 , and W 密 satisfy: 50mm≤L 电 ×d 吸 / W 密≤200mm. Wherein, the direction indicated by the arrow in Figure 1 is the direction perpendicular to the surface of the battery 200 towards the heat-absorbing piece 100, that is, the arrangement direction of the battery 200 and the heat-absorbing piece 100. The heat-absorbing piece 100 in the battery assembly 300 provided by the application can transfer the heat of the battery 200, avoiding the low use performance and safety problems caused by high temperature of the battery 200; wherein, the packaging structure 11 in the heat-absorbing piece 100 only has one opening 110, and the single-sided sealing of the sealing structure 12 can form the sealed space 13 containing the heat-absorbing part 20, reducing the proportion of the sealing structure 12 and the packaging structure 11 in the heat-absorbing piece 100, thereby being conducive to improving the proportion of the heat-absorbing part 20 in the heat-absorbing piece 100, and helping to improve the heat-absorbing performance of the heat-absorbing piece 100, and at the same time, L 电 、d 吸 、W 密 The values of the above conditions further ensure the low proportion of the sealing structure 12 and the high proportion of the heat-absorbing part 20 in the heat-absorbing piece 100, which is conducive to improving the sealing performance of the packaging part 10 and the structural reliability of the heat-absorbing piece 100, and also conducive to improving the heat-absorbing performance of the heat-absorbing piece 100, reducing the preparation cost and improving the preparation efficiency, and improving the use performance, safety performance and preparation efficiency of the battery assembly 300.

[0042] In the application, the sealing structure 12 seals the opening 110 of the packaging structure 11, thereby forming the packaging part 10 with the sealed space 13; wherein, in the related art, the sealing structure 12 needs to seal the four sides of the packaging structure 11 to form the sealed space 13, while in the application, the packaging structure 11 only has one opening 110, so that the sealing structure 12 only needs to seal this opening 110, greatly reducing the size proportion of the sealing structure 12 in the packaging part 10, which is conducive to improving the volume proportion of the sealed space 13 in the packaging part 10, thereby increasing the proportion of the heat-absorbing part 20 and improving the heat-absorbing performance of the heat-absorbing piece 100; at the same time, in the related art, there are more sealing places, and the probability of sealing failure is larger, and the sealing reliability is reduced, while in the application, the size proportion of the sealing structure 12 is small, the probability of sealing failure is low, and the sealing reliability of the packaging part 10 is improved, which is conducive to packaging the heat-absorbing part 20 and improving the structural reliability of the heat-absorbing piece 100.

[0043] In the application, the packaging structure 11 only has one opening 110, which can connect the internal space of the packaging structure 11 with the outside, and the sealing structure 12 seals the opening 110, so that the internal space of the packaging structure 11 forms the sealed sealed space 13. In the application, the shape of the packaging structure 11 and the opening 110 can be selected as needed, for example, the packaging structure 11 can be but is not limited to a cuboid, a cube, a cylinder, an irregular shape (such as a bag) and the like, and the shape of the opening 110 can be but is not limited to a rectangle, a square, a diamond, a circle, a semicircle, an ellipse, an irregular shape and the like.

[0044] The packaging structure 11 in the present application only has one opening 110, and the sealing structure 12 seals the opening 110, that is, the opening 110 and the sealing structure 12 are located at one end of the packaging structure 11. In some embodiments of the present application, the extension direction of the maximum side length of the surface of the heat absorption member 100 towards the battery 200 is the first direction, and the sealing structure 12 is located at one end of the packaging structure 11 in the first direction. For example, when the heat absorption member 100 is a regular cuboid, the first direction (as shown by the arrow in FIG. 2) is the length direction of the heat absorption member 100 / packaging part 10 / packaging structure 11, and the sealing structure 12 is arranged at one end of the packaging structure 11 in the length direction. Compared with the case where the sealing structure 12 is arranged at one end of the packaging structure 11 in the width direction or the thickness direction, the space to be sealed is smaller when the sealing structure 12 is arranged at one end of the packaging structure 11 in the length direction, so that the proportion of the sealing structure 12 in the packaging part 10 is smaller, which helps to further increase the size of the sealing space 13, thereby facilitating the arrangement of more heat absorption parts 20, and further improving the heat absorption performance of the heat absorption member 100. Therefore, the sealing structure 12 located at one end of the packaging structure 11 in the first direction helps to further improve the heat absorption performance of the heat absorption member 100 and improve the use safety of the battery assembly 300. In the present application, for the same component, especially for the square structure component, the length direction of the component is greater than or equal to the width direction, and the width direction is greater than or equal to the thickness direction. In some embodiments of the present application, the heat absorption member 100 is a cuboid, and the direction from the heat absorption part 20 to the sealing structure 12 is the length direction of the heat absorption member 100.

[0045] In some embodiments of the present application, the encapsulation structure 11 is a one-piece structure. For example, the encapsulation structure 11 can be formed by one-piece of the encapsulation layer, and the thickness of the encapsulation layer is the thickness of the encapsulation structure 11. In some embodiments of the present application, the thickness of the encapsulation structure 11 is 30-150 μm, which is beneficial to improve the encapsulation effect of the encapsulation part 10, and meanwhile, the thickness and weight of the heat-absorbing member 100 are not increased too much. For example, the thickness of the encapsulation structure 11 can be 30 μm, 35 μm, 38 μm, 40 μm, 50 μm, 60 μm, 75 μm, 80 μm, 85 μm, 90 μm, 100 μm, 120 μm, 130 μm or 150 μm, etc. In an embodiment, the thickness of the encapsulation structure 11 is 35-90 μm. In another embodiment, the thickness of the encapsulation structure 11 is 30-60 μm. In yet another embodiment, the thickness of the encapsulation structure 11 is 65-100 μm. In some embodiments of the present application, the encapsulation structure 11 is an equal-thickness structure, i.e., the thickness of the encapsulation structure 11 is equal everywhere. In other embodiments of the present application, the encapsulation structure 11 is a non-equal-thickness structure, i.e., the thickness of the encapsulation structure 11 is different everywhere. In an embodiment, the encapsulation structure 11 comprises a first part which is in contact with the battery 200 and a second part which is connected to the first part, wherein the thickness of the first part is less than the thickness of the second part, so as to facilitate the heat-absorbing member 100 to conduct and absorb the heat generated by the battery 200 more quickly, and meanwhile, the structural reliability of the encapsulation part 10 can be ensured. It can be understood that the second part is not in contact with the battery 200.

[0046] In some embodiments of the present application, referring to FIG. 5, which is an enlarged view of the dashed area in FIG. 4, the packaging structure 11 includes a corrosion-resistant layer 111, a metal layer 112 disposed on the surface of the corrosion-resistant layer 111 away from the heat-absorbing part 20, and an insulating layer 113 disposed on the surface of the metal layer 112 away from the corrosion-resistant layer 111. That is, the packaging layer includes the corrosion-resistant layer 111, the metal layer 112, and the insulating layer 113 stacked together, and in the heat-absorbing element 100, the corrosion-resistant layer 111 is closer to the heat-absorbing part 20 than the metal layer 112 and the insulating layer 113. The corrosion-resistant layer 111 can prevent the corrosion of the heat-absorbing part 20 to the packaging part 10, improve the structural reliability of the packaging part 10, the metal layer 112 can reduce the water vapor permeability of the packaging part 10, prevent the influence of the external environment on the heat-absorbing part 20, and at the same time, enhance the protection of the packaging part 10 to the heat-absorbing part 20, the insulating layer 113 ensures the insulation performance of the heat-absorbing element 100, which is conducive to the use of the heat-absorbing element 100 with the battery 200, ensures the use performance of the battery assembly 300, and the three layers cooperate with each other, which not only improves the sealing performance of the packaging part 10, but also improves the mechanical properties of the packaging part 10, such as impact resistance and compression resistance, which is conducive to the use of the heat-absorbing element 100. In some embodiments of the present application, the thickness of the corrosion-resistant layer 111 is 30 μm to 150 μm, which can ensure the long-term stable packaging of the heat-absorbing part 20 by the packaging part 10, and at the same time, will not excessively increase the thickness of the heat-absorbing element 100, which is conducive to the use of the heat-absorbing element 100. Specifically, the thickness of the corrosion-resistant layer 111 can be, but is not limited to, 30 μm, 40 μm, 50 μm, 55 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, or 150 μm, etc. In an embodiment, the thickness of the corrosion-resistant layer 111 can be 30 μm to 75 μm. In another embodiment, the thickness of the corrosion-resistant layer 111 can be 50 μm to 100 μm. In yet another embodiment, the thickness of the corrosion-resistant layer 111 can be 100 μm to 150 μm. In some embodiments of the present application, the thickness of the metal layer 112 is 3 μm to 20 μm, which is conducive to reducing the water vapor permeability of the packaging part 10 and increasing the packaging effect of the packaging part 10, and at the same time, will not excessively increase the thickness of the heat-absorbing element 100, which is conducive to the use of the heat-absorbing element 100. Specifically, the thickness of the metal layer 112 can be, but is not limited to, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, or 20 μm, etc. In an embodiment, the thickness of the metal layer 112 can be 3 μm to 10 μm. In another embodiment, the thickness of the metal layer 112 can be 7 μm to 13 μm. In yet another embodiment, the thickness of the metal layer 112 can be 13 μm to 20 μm.In some embodiments of the present application, the thickness of the insulation layer 113 is 5-20 μm, which is conducive to ensuring the insulation performance of the heat-absorbing member 100 while not increasing the thickness of the heat-absorbing member 100 too much, and is conducive to the use of the heat-absorbing member 100. Specifically, the thickness of the insulation layer 113 can be, but is not limited to, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm or 20 μm, etc. In an embodiment, the thickness of the insulation layer 113 can be 5-10 μm. In another embodiment, the thickness of the insulation layer 113 can be 10-15 μm. In yet another embodiment, the thickness of the insulation layer 113 can be 15-20 μm. In the present application, the material of the corrosion-resistant layer 111 can be, but is not limited to, a corrosion-resistant and inert plastic material, and the material of the insulation layer 113 can be, but is not limited to, an insulating plastic or an insulating high-voltage-resistant material, which improves the impact resistance of the packaging structure 11. In some embodiments of the present application, the corrosion-resistant layer 111 comprises at least one of a polypropylene layer and a polyethylene layer. For example, the corrosion-resistant layer 111 is a polypropylene layer or a polyethylene layer. In some embodiments of the present application, the metal layer 112 comprises at least one of an aluminum layer, an aluminum alloy layer, a copper layer, a copper alloy layer, a zinc layer and a zinc alloy layer. For example, the metal layer 112 is an aluminum layer. In some embodiments of the present application, the insulation layer 113 comprises at least one of a polyethylene terephthalate layer and a polybutylene terephthalate layer. For example, the insulation layer 113 is a polyethylene terephthalate layer. In some embodiments of the present application, the corrosion-resistant layer 111 is a polyethylene layer, the metal layer 112 is an aluminum layer, and the insulation layer 113 is a polyethylene terephthalate layer, which can further reduce the water vapor permeability of the packaging portion 10.

[0047] In the present application, the sealing structure 12 seals the opening 110 of the packaging structure 11, so that the packaging portion 10 forms a sealed space 13 containing the heat-absorbing portion 20. Referring to FIGS. 2 and 3, in the direction from the heat-absorbing portion 20 to the sealing structure 12, the size of the sealing structure 12 is W 密 . The direction from the heat-absorbing portion 20 to the sealing structure 12 is parallel to the first plane, which is the plane where the surface of the heat-absorbing member 100 facing the battery 200 is located, i.e., the width of the sealing structure 12 is W 密 , the length of the sealing structure 12 is the size of the sealing structure 12 in the direction of extension thereof, and the thickness of the sealing structure 12 is the size of the sealing structure 12 in the direction of arrangement of the battery 200 and the heat-absorbing member 100. In some embodiments of the present application, W 密W can be 2mm to 20mm, which can form a closed sealing space 13 with the packaging structure 11, and meanwhile, the size proportion is not small, which improves the size of the sealing space 13 in the packaging part 10, and then is beneficial to improve the effective use area of the heat absorption part 20, improve the heat absorption performance of the heat absorption member 100, and also can improve the sealing performance of the packaging part 10, and prevent the loss of the heat absorption part 20. Specifically, W 密 may be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 7.5mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm or 20mm, etc. In an embodiment, W 密 may be 2mm to 8mm. In another embodiment, W 密 may be 3mm to 7mm. In yet another embodiment, W 密 may be 7mm to 15mm. In yet another embodiment, W 密 may be 13mm to 20mm. In some embodiments of the present application, the sealing structure 12 is located at one end of the packaging structure 11 in the first direction. The direction of the heat absorption part 20 to the sealing structure 12 is the first direction.

[0048] The material of the sealing structure 12 in the present application can be selected from corrosion-resistant and heat-fused materials, which is beneficial to the sealing of the sealing structure 12 to the opening 110. In some embodiments of the present application, the sealing structure 12 can include a corrosion-resistant layer 111, a metal layer 112 disposed on the surface of the corrosion-resistant layer 111 away from the heat absorption part 20, and an insulating layer 113 disposed on the surface of the metal layer 112 away from the corrosion-resistant layer 111. The thickness and material selection of the corrosion-resistant layer 111, the metal layer 112 and the insulating layer 113 are as described above, and will not be repeated here. When the sealing structure 12 and the packaging structure 11 both have the corrosion-resistant layer 111, the metal layer 112 and / or the insulating layer 113, the material and thickness of the corrosion-resistant layer 111, the metal layer 112 and the insulating layer 113 in the sealing structure 12 and the packaging structure 11 can be the same or different. For example, the structure of the sealing structure 12 and the packaging structure 11 can be the same. In another embodiment of the present application, the sealing structure 12 is a corrosion-resistant layer 111. In an embodiment, the sealing structure 12 can be a polypropylene layer or a polyethylene layer.

[0049] In some embodiments of the present application, the packaging structure 11 has an end surface at the opening 110, and the sealing structure 12 is connected to the end surface to seal the opening 110. In some other embodiments of the present application, the packaging structure 11 has an inner surface facing the sealed space 13 and an outer surface facing away from the sealed space 13, and the sealing structure 12 is connected to the inner surface to seal the opening 110. In yet some other embodiments of the present application, the sealing structure 12 is connected to both the end surface and the inner surface to seal the opening 110.

[0050] The sealing structure 12 seals the opening 110 of the packaging structure 11 to form the sealed space 13 inside the packaging portion 10, which is used to accommodate the heat absorption portion 20. The surfaces of the packaging structure 11 and the sealing structure 12 facing the sealed space 13 are the cavity walls of the sealed space 13, which can be flat or uneven. The packaging structure 11 and the sealing structure 12 affect the shape of the sealed space 13, which can be a cuboid, a cube, a cylinder, an irregular shape, etc. In the arrangement direction of the battery 200 and the heat absorption member 100, the size of the sealed space 13 is the thickness of the sealed space 13; in the plane perpendicular to the arrangement direction, the maximum length of the sealed space 13 is the length of the sealed space 13; and in the plane perpendicular to the arrangement direction, the maximum size of the sealed space 13 in the direction perpendicular to the maximum length of the sealed space 13 is the width of the sealed space 13.

[0051] In some embodiments of the present application, the volume of the sealed space 13 is V 密 , the volume of the heat absorption portion 20 is V 吸 , and V 密 , V 吸 satisfy: 90%≤V 吸 / V 密 ≤98%. Specifically, V 吸 / V 密The percentages can be, but are not limited to, 91%, 92%, 93%, 94%, 95%, 96%, or 97%. Thus, the heat-absorbing part 20 does not completely fill the sealed space 13, leaving residual space within it. When the heat-absorbing element 100 is subjected to external pressure, the encapsulation part 10 can undergo a certain deformation to resist the pressure, preventing the heat-absorbing element 100 from failing due to breakage between the sealing structure 12 and the encapsulation structure 11, or within the sealing structure 12 itself, or within the encapsulation structure 11 itself under external pressure. This increases the rupture pressure of the encapsulation part 10 and improves the impact resistance of the heat-absorbing element 100. Specifically, the rupture pressure of the encapsulation part 10 can be above 0.5 MPa, improving the overall structural reliability. The rupture pressure test method involves measuring the compressive stress-strain curve of the finished material using a sample testing machine. The core material size of the sample is 50 mm × 50 mm, the inlet force is 5 N, the compression rate is 2 mm / min, and compression continues until the encapsulation film cracks. The strength at the point of rupture is recorded. In some embodiments of this application, 91.7% ≤ V 吸 / V 密 With a strength of ≤95%, the heat absorber 100 achieves both excellent impact resistance and heat absorption performance.

[0052] In some embodiments of this application, the length of the sealed space 13 is L. 空 Width is W 空 The length of the heat-absorbing part 20 is L 吸 Width is W 吸 L 空 L 吸 W 空 W 吸 Satisfy: 1mm≤L 空 -L 吸 ≤10mm; and / or 1mm≤W 空 -W 吸 ≤5mm. This results in residual space within the sealed space 13, increasing the rupture pressure of the encapsulation portion 10 and improving the impact resistance of the heat-absorbing element 100. In the specific embodiment of Figure 2, the length direction of the sealed space 13 and the length direction of the heat-absorbing portion 20 correspond to the left-right direction in Figure 2, while the width direction of the sealed space 13 and the width direction of the heat-absorbing portion 20 are perpendicular to the left-right and up-down directions in Figure 2. For example, L... 空 -L 吸 It can be, but is not limited to, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm, etc., W 空 -W 吸 The thickness can be, but is not limited to, 1mm, 2mm, 3mm, 4mm, or 5mm. Specifically, the burst pressure of the encapsulation part 10 can be above 0.5MPa, improving the overall structural reliability. In some embodiments of this application, 2mm ≤ L空 L 吸 ≤10mm; 4mm≤W 空 W 吸 ≤5mm, so that the heat absorption member 100 has better impact resistance and heat absorption performance.

[0053] In some embodiments of the present application, the water vapor transmission rate of the packaging portion 10 is less than or equal to 0.02 g / (m 2 ·24h). The low water vapor transmission rate of the packaging portion 10 ensures the packaging of the heat absorption portion 20 by the packaging portion 10, avoids the loss of the heat absorption portion 20, especially the packaging of the volatile heat absorption material, and improves the service life and performance of the heat absorption member 100. In an embodiment, the water vapor transmission rate of the packaging portion 10 can be 0.001 g / (m 2 ·24h) to 0.02 g / (m 2 ·24h). The water vapor transmission rate of the packaging portion 10 can be tested by, but not limited to, a weighing method, for example, a container containing a drying agent (such as calcium chloride) can be sealed on one side of the test material, and then the weight gain of the drying agent is measured, and the water vapor transmission rate is calculated by the weight of the drying agent absorbing water vapor.

[0054] In the present application, the heat absorption portion 20 is accommodated and fixed in the sealed space 13 of the packaging portion 10, and the heat absorption portion 20 has heat absorption performance, which ensures the heat absorption performance of the heat absorption member 100. In some embodiments of the present application, the heat absorption portion 20 includes a heat absorption material. Exemplarily, the heat absorption material can be a phase change material, which can be an inorganic material or an organic material. The phase change material can absorb heat and conduct heat by phase change, thereby transferring the heat generated by the battery 200 to achieve heat dissipation of the battery 200. Specifically, the phase change material includes at least one of a solid-liquid phase change material, a liquid-gas phase change material, a solid-gas phase change material, and a solid-solid phase change material; for example, the phase change material is a solid-liquid phase change material, a liquid-gas phase change material, a solid-gas phase change material, or a solid-solid phase change material. In an embodiment, the heat absorption material includes water and / or ethanol. In other embodiments of the present application, the heat absorption portion 20 includes a skeleton 21 and a heat absorption material, and the skeleton 21 has a hole 211, and the heat absorption material is arranged in the hole 211. The skeleton 21 has a hole 211 penetrating through the thickness direction thereof, and the heat absorption material is arranged in the hole 211 of the skeleton 21. The skeleton 21 plays a supporting and shaping role for the heat absorption material, and at the same time can fix and limit the position and movement of the heat absorption material to a certain extent, avoiding the problem that the heat absorption material moves too much to generate excessive impact force on the packaging portion 10 and reduce the service life. At the same time, by arranging the position of the skeleton 21, the heat absorption material is closer to the surface where the heat absorption member 100 is attached to the battery 200, thereby improving the response speed and response time of heat absorption.

[0055] The size and shape of the framework 21, the shape, number and aperture of the holes 211 in the present application can be set according to the heat absorption requirements of the heat absorption member 100. For example, the holes 211 can be cuboid, square, prism, cylinder or irregular shape, etc., and the number of holes 211 can be more than 5, more than 10, more than 30, more than 50, etc. In an embodiment, the hole opening of the holes 211 is a regular hexagon, which can further improve the strength and service life of the framework 21. Please refer to FIG. 6, which is a schematic diagram of the structure of the framework provided in an embodiment of the present application, wherein the framework 21 has a plurality of holes 211, and the heat absorption material can be arranged in the holes 211. In some embodiments of the present application, the framework 21 is a flexible framework 21, which can better fit on the cavity wall of the sealed space 13 and improve the heat absorption performance of the heat absorption member 100. In an embodiment, the framework 21 comprises a polypropylene framework. In some embodiments of the present application, the thickness of the framework 21 is 0.1mm to 10mm, which can support and limit the heat absorption material, and at the same time, will not increase the thickness and weight of the heat absorption member 100 too much, which is beneficial to the use of the heat absorption member 100. Along the arrangement direction of the battery 200 and the heat absorption member 100, the size of the framework 21 is the thickness of the framework 21. Specifically, the thickness of the framework 21 can be, but is not limited to, 0.1mm, 0.3mm, 0.7mm, 1mm, 1.5mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm, etc. In an embodiment, the thickness of the framework 21 can be 0.1mm to 2mm. In another embodiment, the thickness of the framework 21 can be 1mm to 5mm. In yet another embodiment, the thickness of the framework 21 can be 5mm to 10mm. The heat absorption part 20 can have one or more frameworks 21. In some embodiments of the present application, the heat absorption part 20 comprises a plurality of frameworks 21, which are stacked along the thickness direction of the frameworks 21, and the holes 211 of adjacent frameworks 21 are communicated. By arranging a plurality of frameworks 21, more heat absorption material can be better supported and limited, and the communicated holes 211 ensure the movement of the heat absorption material in the plurality of frameworks 21, which further improves the use performance of the heat absorption member 100. In some embodiments of the present application, the thickness of the framework 21 is less than the thickness of the heat absorption material. In some embodiments of the present application, the aperture of the holes 211 is 3mm to 4mm, which is beneficial to the movement and phase change of the heat absorption material, and further improves the heat absorption performance of the heat absorption member 100. The aperture of the holes 211 is the maximum size of the holes 211 in the plane perpendicular to the thickness direction of the framework 21. In an embodiment, the aperture of the holes 211 can be 3mm to 3.5mm. In another embodiment, the aperture of the holes 211 can be 3.5mm to 4mm.

[0056] Please refer to FIG. 2, the size of the heat absorption part 20 in the direction perpendicular to the surface of the battery 200 facing the heat absorption member 100, i.e. in the arrangement direction of the battery 200 and the heat absorption member 100, is d 吸 , i.e. the thickness d of the heat absorption part 20 吸 In some embodiments of the present application, d 吸 is 0.5mm to 50mm, which not only ensures the proportion of the heat absorption part 20 in the heat absorption member 100 and improves the heat absorption performance of the heat absorption member 100, but also does not excessively increase the thickness of the sealed space 13 and reduce the thickness of the heat absorption member 100. Specifically, d 吸 may be but is not limited to 0.5mm, 0.8mm, 1mm, 1.5mm, 2mm, 2.7mm, 3mm, 3.5mm, 5mm, 8mm, 10mm, 13mm, 15mm, 20mm, 22mm, 27mm, 30mm, 35mm, 40mm, 43mm, 45mm, 47mm or 50mm. In an embodiment, d 吸 may be 0.5mm to 10mm. In another embodiment, d 吸 may be 10mm to 25mm. In yet another embodiment, d 吸 may be 20mm to 35mm. In yet another embodiment, d 吸 may be 30mm to 50mm. In yet another embodiment, d 吸 may be 0.5mm to 5mm, so that the heat absorption member 100 has better heat absorption performance and light weight.

[0057] Please refer to FIG. 1, on the surface of the battery 200 facing the heat absorption member 100, the maximum side length of the battery 200 is L 电 , i.e. the length of the battery 200 is L 电 . In some embodiments of the present application, L 电 is 500mm to 1200mm. Specifically, L 电 may be but is not limited to 500mm, 550mm, 580mm, 600mm, 650mm, 700mm, 720mm, 750mm, 800mm, 850mm, 900mm, 950mm, 1000mm, 1050mm, 1100mm or 1200mm, etc. In an embodiment, L 电 may be 500mm to 800mm. In another embodiment, L 电 may be 700mm to 1000mm. In yet another embodiment, L 电 may be 1000mm to 1200mm. In yet another embodiment, L 电 may be 500mm to 1000mm. In some embodiments of the present application, the battery 200 is a cuboid; L 电L is the length of the battery 200; the direction perpendicular to the surface of the battery 200 facing the heat sink 100 is parallel to the thickness direction of the battery 200; the length of the battery 200 is greater than the thickness of the battery 200.

[0058] The inventors of the present application found through a series of studies that L 电 , d 吸 , and W 密 satisfy: 50mm≤L 电 ×d 吸 / W 密 ≤200mm, which can reduce the size of the sealing structure 12, increase the effective use area of the heat absorption part 20, improve the heat absorption effect of the heat sink 100 on the battery 200, and at the same time improve the sealing effect of the heat sink 100, greatly increasing the use performance of the battery assembly 300. For example, the lower limit of L 电 ×d 吸 / W 密 may be, but is not limited to, 50mm, 52mm, 55mm, 57mm, 60mm, 61mm, 65mm, 66mm, 69mm, 70mm, 75mm, 78mm, 80mm, 82mm, 85mm, 90mm, 95mm, 100mm, 105mm, 110mm, 115mm, 120mm, 130mm, 135mm, or 140mm, etc., and the upper limit of L 电 ×d 吸 / W 密 may be, but is not limited to, 90mm, 95mm, 100mm, 105mm, 110mm, 115mm, 120mm, 130mm, 135mm, 140mm, 145mm, 150mm, 155mm, 160mm, 165mm, 170mm, 175mm, 180mm, 190mm, 195mm, or 200mm, etc. Specifically, L 电 ×d 吸 / W 密 may be, but is not limited to, 55mm to 180mm, 70mm to 150mm, 90mm to 130mm, 50mm to 100mm, 100mm to 200mm, 75mm to 120mm, 110mm to 160mm, 120mm to 180mm, or 130mm to 190mm, etc. In some embodiments of the present application, L 电 , d 吸 , and W 密 satisfy: 120mm≤L 电 ×d 吸 / W 密≤180mm, which is advantageous to further increase the proportion of the heat absorption part 20 in the heat absorption part 100, while ensuring the sealing effect of the packaging part 10, improving the heat absorption performance and structural reliability of the heat absorption part 100, and further improving the use performance of the battery assembly 300.

[0059] In some embodiments of the present application, the battery 200 comprises a battery body 201, and a positive electrode pole 202 and a negative electrode pole 203 arranged on the battery body 201. In an embodiment, the positive electrode pole 202 and the negative electrode pole 203 are arranged at the same end of the battery body 201. In another embodiment, the positive electrode pole 202 and the negative electrode pole 203 are arranged at two ends of the battery body 201. Please refer to FIG. 7, which is a cross-sectional schematic view of a battery assembly provided by an embodiment of the present application. The positive projection of the heat absorption part 100 on the plane where the surface of the battery body 201 is located does not have an overlapping area with the positive projection of the positive electrode pole 202 and the negative electrode pole 203 on the plane, which ensures the connection between the plurality of positive electrode poles 202 and negative electrode poles 203 in the battery pack 400. In an embodiment, the area of the positive projection of the heat absorption part 100 on the plane where the surface of the battery body 201 is located accounts for more than 80% of the surface area of the battery body 201. For example, the area of the positive projection of the heat absorption part 100 on the plane where the surface of the battery body 201 is located accounts for more than 82%, more than 85%, more than 87%, more than 90%, more than 93%, more than 95%, more than 97%, more than 98% or 100% of the surface area of the battery body 201. In this way, the heat transfer effect of the heat absorption part 100 on the battery 200 can be further improved, and the performance of the battery assembly 300 can be improved. In another embodiment of the present application, the battery 200 further comprises a shell having a cavity, and the battery body 201 is arranged in the cavity.

[0060] In some embodiments of the present application, the heat absorption part 20 can be arranged in the packaging structure 11, and the opening 110 of the packaging structure 11 is sealed by the sealing structure 12 to obtain the heat absorption part 100. In an embodiment, the packaging structure 11 can be processed by using a composite film, and after the heat absorption part 20 is arranged, the composite film at the opening 110 is heated to form the sealing structure 12. In another embodiment, the composite film can be inflated into a bag-shaped structure, and after the heat absorption part 20 is arranged, the composite film at the opening 110 is heated to form the sealing structure 12. Specifically, the composite film can include, but is not limited to, a corrosion-resistant layer 111, a metal layer 112 and an insulating layer 113 arranged in layers, and the sealing structure 12 formed can be the same as the composite film, or can only have the corrosion-resistant layer 111. For example, the corrosion-resistant layer 111 in the composite film can be heat-fused to form the sealing structure 12; for example, heat-fusion can use a heat sealer to generate heat pressure sealing. The above preparation method is simple, easy to operate, improves the preparation efficiency and air tightness of the heat absorption part 100, reduces the preparation cost, and is advantageous to the use of the heat absorption part 100 and the battery assembly 300.

[0061] The application provides a battery pack 400 comprising the battery assembly 300 in any of the above embodiments. The battery 200 in the battery pack 400 has good use performance, and the heat generated during use can be timely absorbed, so that the battery 200 is prevented from being in a high-temperature state, and the use safety of the battery pack 400 is improved.

[0062] In some embodiments of the application, the battery pack 400 comprises a plurality of battery assemblies 300, the plurality of battery assemblies 300 comprise a plurality of batteries 200 and a plurality of heat absorption members 100, and the plurality of batteries 200 and the plurality of heat absorption members 100 are alternately and spacedly arranged. Referring to FIG. 8, a structural schematic diagram of a battery pack provided by an embodiment of the application, the battery pack 400 comprises two battery assemblies 300, and the batteries 200 and the heat absorption members 100 in the battery pack 400 are alternately and spacedly arranged. In the stacking direction of the plurality of battery assemblies 300, the heat absorption member 100 can be located at the outermost side in the battery pack 400, or the battery 200 can be located at the outermost side. For example, in the stacking direction of the battery assembly 300, the heat absorption member 100 is located at the outermost side, or the battery 200 is located at the outermost side, or the heat absorption member 100 is located at the outermost side at one end, and the battery 200 is located at the outermost side at the opposite end.

[0063] The application provides a power consumption device comprising the battery pack 400 in any of the above embodiments. The power consumption device has excellent use performance and strong product competitiveness. The power consumption device can be a vehicle, an electronic device (such as a mobile phone, a computer, a camera, etc.), an energy storage system, or the like.

[0064] The effects of the technical solutions of the application are further described below through specific examples.

[0065] Examples 1-10

[0066] A battery assembly comprises a battery and a heat absorption member arranged on the surface of the battery, the heat absorption member comprises an encapsulation part and a heat absorption part, the encapsulation part has a sealed space inside, the heat absorption part is arranged in the sealed space, the encapsulation part comprises an encapsulation structure and a sealing structure (polyethylene), the encapsulation structure has only one opening, and the sealing structure is arranged at the opening to form the sealed space; wherein the composite film is a polyethylene layer, an aluminum layer and a polyethylene terephthalate layer arranged in layers, the heat absorption part is filled after the composite film is blown into a bag-shaped encapsulation structure, the sealing structure that seals the opening of the encapsulation structure is formed by heat sealing, and the heat absorption material is a hydrogel; the difference between Examples 1-10 lies in different structure sizes.

[0067] Comparative Examples 1-2

[0068] The same as Example 1, except that the structure size is different.

[0069] Comparative Example 3

[0070] The same as Example 1, except that the four sides of the two-layer composite film were heat-sealed by a heat-sealing machine, and the heat-absorbing part was filled in the process to form the heat-absorbing member, and the structural dimensions were different from those of Example 1.

[0071] L 电 , d 吸 , and W 密 of the battery assemblies of the examples and the comparative examples were measured in mm, the values of L 电 , d 吸 , and W 密 were substituted into L 电 × d 吸 / W 密 to obtain the values of L 电 × d 吸 / W 密 , and the results are shown in Table 1. V 密 , V 吸 , L 空 , L 吸 , W 空 , and W 吸 of the battery assemblies of the examples were measured in mm, and the values of V 吸 / V 密 , L 空 -L 吸 , and W 空 -W 吸 were calculated, and the results are shown in Table 2. The sealing tension (i.e., the sealing strength) of the heat-absorbing member and the heat-absorbing capacity per unit area of the heat-absorbing member of the battery assemblies of the examples and the comparative examples were measured, and the results are shown in Table 3; wherein the sealing tension detection method was as follows: the sealed composite film in the heat-absorbing member was cut into a 15 mm wide sealing edge (which can be formed by heat sealing), the two edges of the cut composite film sealing edge were clamped by a tension machine, and when the adhesive part of the composite film sealing edge was completely separated (i.e., the opening heat-sealed together was pulled apart), the force of the tension machine was recorded as the sealing tension strength; the heat-absorbing capacity per unit area detection method was as follows: the enthalpy of the heat-absorbing material was detected by differential scanning calorimetry, and the enthalpy was A, in kJ / kg; the heat-absorbing member was dried in an oven until its mass did not change, the mass change before and after drying of the heat-absorbing member was recorded as M, in kg, and the heat-absorbing capacity was the product of A and M, and the heat-absorbing capacity per unit area = heat-absorbing capacity / (area of the sealing space) = heat-absorbing capacity / (L 空 × W 空 ).

[0072] Table 1 Size Detection Results 1

[0073] Table 2 Size Detection Results 2

[0074] Table 3 performance test results

[0075] It can be seen that the L 电 ×d 吸 / W 密 of the comparative example 1-2 is greater than 200mm, so that the heat absorption member has good heat absorption effect, but the sealing ability of the heat absorption member is poor, which is not conducive to the use of the heat absorption member; the L 电 ×d 吸 / W 密 of the comparative example 3 is less than 50mm, and the comparative example 3 adopts a four-seal sealing mode, so that the sealing edge accounts for a large proportion, which greatly affects the heat absorption performance of the heat absorption member; and the heat absorption member of the embodiment of the present application has only one opening in the packaging structure, and the sealing performance of the heat absorption member is ensured by single-sided sealing, and the L 电 ×d 吸 / W 密 of the heat absorption member is between 50mm and 200mm, so that the heat absorption member also has excellent heat absorption performance, which is conducive to the use of the heat absorption member and the battery assembly.

[0076] The above-described embodiments only express one embodiment of the present application, which is described in detail, but it should not be understood as a limitation on the scope of the present application. It should be noted that for ordinary skilled in the art, without departing from the design concept of the present application, a number of modifications and improvements can be made, which are all within the scope of protection of the present application. Therefore, the scope of protection of the present application should be subject to the appended claims.

Claims

1. A battery assembly, wherein, The device includes a battery and a heat-absorbing element disposed on the surface of the battery. The heat-absorbing element includes an encapsulation part and a heat-absorbing part. The encapsulation part has a sealed space inside. The heat-absorbing part is disposed in the sealed space. The encapsulation part includes an encapsulation structure and a sealing structure. The encapsulation structure has an opening on one side. The sealing structure is disposed in the opening to form the sealed space. On the surface of the battery facing the heat absorber, the maximum side length of the battery is L. 电 , The dimension of the heat-absorbing portion is d in a direction perpendicular to the surface of the battery facing the heat-absorbing element. 吸 , In the direction from the heat-absorbing part to the sealing structure, the dimension of the sealing structure is W. 密 , The L 电 The d 吸 The W 密 Satisfies: 50mm≤L 电 ×d 吸 / W 密 ≤200mm.

2. The battery assembly as claimed in claim 1, wherein, The volume of the sealed space is V 密 , The volume of the heat-absorbing part is V. 吸 , The V 密 The V 吸 Satisfy: 90% ≤ V 吸 / V 密 ≤98%.

3. The battery assembly as claimed in claim 2, wherein, The V 密 The V 吸 satisfy: 91.7%≤V 吸 / V 密 ≤95%.

4. The battery assembly as described in any one of claims 1-3, wherein, The length of the sealed space is L. 空 Width is W 空 , The length of the heat-absorbing part is L. 吸 Width is W 吸 , The L 空 The L 吸 The W 空 The W 吸 satisfy: 1mm≤L 空 -L 吸 ≤10mm; and / or 1mm≤W 空 -IN 吸 ≤5mm。 5. The battery assembly as claimed in claim 4, wherein, The L 空 The L 吸 The W 空 The W 吸 satisfy: 2mm≤L 空 -L 吸 ≤10mm; and / or 4mm≤W 空 -IN 吸 ≤5mm。 6. The battery assembly of claim 1, wherein, The battery assembly satisfies at least one of the following (a), (b) and (c): (a) The L 电 The range is from 500mm to 1200mm; (b) the d 吸 The range is from 0.5mm to 50mm; (c) The W 密 The thickness ranges from 2mm to 20mm.

7. The battery assembly of claim 6, wherein, The battery assembly satisfies: The L 电 500mm to 1000mm; and / or The d 吸 The thickness ranges from 0.5mm to 5mm.

8. The battery assembly of claim 1, wherein, The heat-absorbing element faces the surface of the battery, and the direction in which the maximum side length of the heat-absorbing element extends is a first direction. The sealing structure is located at one end of the encapsulation structure in the first direction.

9. The battery assembly of claim 1, wherein, The encapsulation structure includes a corrosion-resistant layer, a metal layer disposed on the surface of the corrosion-resistant layer opposite to the heat-absorbing portion, and an insulating layer disposed on the surface of the metal layer opposite to the corrosion-resistant layer; and / or the sealing structure includes a corrosion-resistant layer, a metal layer disposed on the surface of the corrosion-resistant layer opposite to the heat-absorbing portion, and an insulating layer disposed on the surface of the metal layer opposite to the corrosion-resistant layer.

10. The battery assembly of claim 9, wherein, At least one of the encapsulation structure and the sealing structure satisfies at least one of the following (d), (e), (f) and (g): (d) the thickness of the corrosion-resistant layer is 30 μm to 150 μm; (e) The thickness of the metal layer is from 3 μm to 20 μm; (f) The thickness of the insulating layer is from 5 μm to 20 μm; (g) The thickness of the encapsulation portion is 30 μm to 100 μm.

11. The battery assembly as claimed in claim 9 or 10, wherein, At least one of the encapsulation structure and the sealing structure satisfies at least one of the following (h), (i), and (j): (h) The corrosion-resistant layer comprises at least one layer of polypropylene and polyethylene; (i) The metal layer comprises at least one of an aluminum layer, an aluminum alloy layer, a copper layer, a copper alloy layer, a zinc layer, and a zinc alloy layer; (j) The insulating layer comprises at least one of a polyethylene terephthalate layer and a polybutylene terephthalate layer.

12. The battery assembly of claim 1, wherein, The water vapor transmission rate of the encapsulation part is less than or equal to 0.02 g / (m²). 2 •24h).

13. The battery assembly of claim 1, wherein, The heat-absorbing part includes a frame and a heat-absorbing material. The frame has holes, and the heat-absorbing material is disposed in the holes.

14. The battery assembly of claim 13, wherein, The heat-absorbing part satisfies at least one of the following (k), (l), (m), (n): (k) The thickness of the skeleton is 0.1 mm to 10 mm; (l) The diameter of the hole is 3mm to 4mm; (m) The skeleton comprises a polypropylene skeleton; (n) The heat-absorbing material includes a phase change material.

15. The battery assembly of claim 1, wherein, The battery is a cuboid; the L 电 The length of the battery; the direction perpendicular to the surface of the battery toward the heat-absorbing element is parallel to the thickness direction of the battery; the length of the battery is greater than the thickness of the battery.

16. The battery assembly of claim 1, wherein, The heat-absorbing element is a cuboid, and the direction from the heat-absorbing part to the sealing structure is the length direction of the heat-absorbing element.

17. A battery pack, wherein, It includes at least one battery assembly as described in any one of claims 1 to 16.

18. The battery pack of claim 17, wherein, The battery pack includes a plurality of battery components, each of which includes a plurality of batteries and a plurality of heat absorbers, with the batteries and heat absorbers arranged alternately at intervals.

19. An electrical appliance, wherein, Includes the battery pack as described in claim 17 or 18.

Images