Battery assembly, battery pack and electric equipment

Abstract

The utility model provides a battery assembly, a battery pack and electric equipment. The battery assembly comprises a battery and a heat absorption part arranged on the surface of the battery, the heat absorption part comprises a packaging part and a heat absorption part, a sealed space is formed in the packaging part, the heat absorption part is arranged in the sealed space, the packaging part comprises a packaging structure and a sealing structure, an opening is formed in one side of the packaging structure, and the sealing structure is arranged on the other side of the packaging structure. The sealing structure is arranged at the opening to form the sealed space; on the surface, facing the heat absorption part, of the battery, the maximum side length of the battery is Lelectricity, the size of the heat absorption part is d absorption in the direction perpendicular to the surface, facing the heat absorption part, of the battery, the size of the sealing structure is W density in the direction from the heat absorption part to the sealing structure, and Lelectricity, d absorption and W density meet the condition that Lelectricity * d absorption / W density is larger than or equal to 50 mm and smaller than or equal to 200 mm.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery assembly, a battery pack and electrical equipment. Background Art

[0002] Batteries provide power support for the use of electrical equipment. The temperature change of the battery during use also affects the performance and safety of the battery and electrical equipment. Therefore, heat absorbers can be used to absorb the heat of the battery, accelerate the transfer of heat from the battery, reduce the battery temperature, and ensure the use of electrical equipment. In related technologies, it is often necessary to heat-press and seal the surroundings of the package to fix the heat-absorbing material therein to form a heat absorber. The heat absorber often cannot take into account both sealing performance and heat-absorbing performance, which affects the use of the battery and electrical equipment. Utility Model Content

[0003] In view of this, the utility model provides a battery assembly, a battery pack and an electrical device, wherein the packaging portion is sealed on one side and the sealing structure is small in size, the heat absorption portion accounts for a large proportion, and the heat absorption part has excellent heat absorption performance. It can effectively absorb the heat generated by the battery while 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 enhance the performance of the electrical equipment.

[0004] In a first aspect, the utility model provides a battery assembly, comprising a battery and a heat absorbing member arranged on the surface of the battery, wherein the heat absorbing member comprises a packaging portion and a heat absorbing portion, wherein the packaging portion has a sealed space inside, wherein the heat absorbing portion is arranged in the sealed space, wherein the packaging portion comprises a packaging structure and a sealing structure, wherein the packaging structure has an opening on one side, and wherein the sealing structure is arranged at the opening to form the sealed space;

[0005] On the surface of the battery facing the heat absorbing member, the maximum side length of the battery is L 电 ,

[0006] In the direction perpendicular to the surface of the battery facing the heat absorbing member, the size of the heat absorbing portion is d 吸 ,

[0007] In the direction from the heat absorption part to the sealing structure, the size of the sealing structure is W 密 ,

[0008] The L 电 , the 吸 , the W 密 Meet: 50mm≤L 电 ×d 吸 / W 密 ≤200mm.

[0009] Optionally, 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%.

[0010] Optionally, the V 密 , the V 吸 Satisfy: 91.7% ≤ V 吸 / V 密 ≤95%.

[0011] Optionally, the length of the sealed space is L 空 , width W 空 , the length of the heat absorbing part is L 吸 , width 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 -W 吸 ≤5mm.

[0012] Optionally, the L 空 , the L 吸 , the W 空 , the W 吸 Satisfy: 2mm≤L 空 -L 吸 ≤10mm; and / or 4mm≤W 空 -W 吸 ≤5mm.

[0013] Optionally, the battery assembly satisfies at least one of the following (a), (b) and (c): (a) the L 电 is 500mm to 1200mm; (b) said d 吸 (c) W 密 2mm to 20mm.

[0014] Optionally, the battery assembly satisfies: 电 is 500mm to 1000mm; and / or said d 吸 0.5mm to 5mm.

[0015] Optionally, on the surface of the heat absorption component facing the battery, an extension direction of a maximum side length of the heat absorption component is a first direction, and the sealing structure is located at one end of the packaging structure in the first direction.

[0016] Optionally, the packaging structure includes a corrosion-resistant layer, a metal layer arranged on a surface of the corrosion-resistant layer facing away from the heat absorption portion, and an insulating layer arranged on a surface of the metal layer facing away from the corrosion-resistant layer.

[0017] Optionally, the sealing structure includes a corrosion-resistant layer, a metal layer arranged on a surface of the corrosion-resistant layer facing away from the heat absorption portion, and an insulating layer arranged on a surface of the metal layer facing away from the corrosion-resistant layer.

[0018] 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; (g) the thickness of the packaging part is 30μm to 100μm.

[0019] 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 includes at least one of a polypropylene layer and a polyethylene layer; (i) the metal layer includes 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 includes at least one of a polyethylene terephthalate layer and a polybutylene terephthalate layer.

[0020] Optionally, the water vapor transmission rate of the packaging portion is less than or equal to 0.02 g / (m 2 ·24h).

[0021] Optionally, the heat absorption part includes a skeleton and a heat absorption material, the skeleton has holes, and the heat absorption material is arranged in the holes.

[0022] Optionally, the heat absorption part satisfies at least one of the following (k), (l), (m), and (n): (k) the thickness of the skeleton is 0.1 mm to 10 mm; (l) the pore diameter of the hole is 3 mm to 4 mm; (m) the skeleton includes a polypropylene skeleton; (n) the heat absorption material includes a phase change material.

[0023] Optionally, the battery is a rectangular parallelepiped; 电 is the length of the battery; the direction perpendicular to the surface of the battery facing the heat absorber is parallel to the thickness direction of the battery; the length of the battery is greater than the thickness of the battery.

[0024] Optionally, the heat absorbing element is a rectangular parallelepiped, and the direction from the heat absorbing portion to the sealing structure is the length direction of the heat absorbing element.

[0025] In a second aspect, the utility model provides a battery pack, comprising the battery assembly described in the first aspect.

[0026] Optionally, the battery pack includes a plurality of the battery assemblies, the plurality of the battery assemblies include a plurality of the batteries and a plurality of the heat absorbers, and the plurality of the batteries and the plurality of the heat absorbers are alternately arranged.

[0027] In a third aspect, the utility model provides an electrical device, comprising the battery pack described in the second aspect.

[0028] The packaging part of the battery assembly provided by the utility model is single-sided sealed and the sealing structure size is small. The proportion of the sealing space and the heat absorption part is reasonable, which helps to improve the heat absorption performance of the heat absorption part under the premise of ensuring sealing, so as to effectively absorb the heat generated by the battery, reduce the temperature of the battery assembly, achieve 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 absorption performance, good safety and performance. The safety and performance of the electrical equipment with the battery pack are excellent, and the product is highly competitive. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solution in the implementation mode of the present utility model, the drawings required for use in the implementation mode of the present utility model will be described below.

[0030] Figure 1 A schematic structural diagram of a battery assembly provided in one embodiment of the utility model.

[0031] Figure 2 for Figure 1 Schematic diagram of the cross section of the heat absorber in the AA direction.

[0032] Figure 3 A schematic cross-sectional view of a packaging portion provided in one embodiment of the utility model.

[0033] Figure 4 A cross-sectional schematic diagram of a packaging structure provided in one embodiment of the utility model.

[0034] Figure 5 for Figure 4 Magnified view of the dashed area.

[0035] Figure 6 A schematic structural diagram of a skeleton provided in one embodiment of the utility model.

[0036] Figure 7A schematic cross-sectional view of a battery assembly provided in accordance with one embodiment of the present invention.

[0037] Figure 8 A schematic structural diagram of a battery pack provided in one embodiment of the utility model.

[0038] Description of labels:

[0039] Packaging part-10, packaging structure-11, opening-110, corrosion-resistant layer-111, metal layer-112, insulating layer-113, sealing structure-12, sealed space-13, heat absorption part-20, skeleton-21, hole-211, heat absorption part-100, battery-200, battery body-201, positive electrode column-202, negative electrode column-203, battery assembly-300, battery pack-400. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] The utility model provides a battery assembly, see Figures 1 to 4 , Figure 1 This is a schematic diagram of the structure of a battery assembly provided in one embodiment of the utility model. Figure 2 for Figure 1 Schematic diagram of the cross section of the heat absorber in the AA direction, Figure 3 This is a cross-sectional schematic diagram of a packaging portion provided by an embodiment of the utility model. Figure 4 A schematic cross-sectional view of a packaging structure provided in one embodiment of the utility model, wherein a battery assembly 300 includes a battery 200 and a heat absorbing member 100 disposed on a surface of the battery 200, wherein the heat absorbing member 100 includes a packaging portion 10 and a heat absorbing member 20, wherein the packaging portion 10 has a sealed space 13 inside, wherein the heat absorbing member 20 is disposed in the sealed space 13, wherein the packaging portion 10 includes a packaging structure 11 and a sealing structure 12, wherein the packaging structure 11 has a single-sided opening (i.e., only one opening 110 is provided on one side), and the sealing structure 12 is disposed at the opening 110 to form the sealed space 13; wherein on the surface of the battery 200 facing the heat absorbing member 100, the maximum side length of the battery 200 is L 电 , in the direction perpendicular to the surface of the battery 200 facing the heat sink 100 (i.e., in the direction perpendicular to the surface of the battery 200 facing the heat sink 100), the size of the heat sink 20 is d 吸 , in the direction from the heat absorption part 20 to the sealing structure 12, the size of the sealing structure 12 is W密 , L 电 d 吸 , W 密 Meet: 50mm≤L 电 ×d 吸 / W 密 ≤200mm. Among them, Figure 1 The direction indicated by the middle arrow is perpendicular to the direction of the battery 200 toward the surface of the heat absorbing member 100, that is, the arrangement direction of the battery 200 and the heat absorbing member 100. The heat absorbing member 100 in the battery assembly 300 provided by the utility model can transfer the heat of the battery 200, avoiding the low performance and safety problems caused by the high temperature of the battery 200; wherein, the packaging structure 11 in the heat absorbing member 100 has only one opening 110, and the sealing structure 12 is used for single-side sealing to form a sealed space 13 for accommodating the heat absorbing part 20, which reduces the proportion of the sealing structure 12 and the packaging structure 11 in the heat absorbing member 100, thereby facilitating the increase of the proportion of the heat absorbing part 20 in the heat absorbing member 100, and helping to improve the heat absorption performance of the heat absorbing member 100, while at the same time L 电 d 吸 , W 密 The numerical value of satisfies the above conditions, which further ensures a low proportion of the sealing structure 12 in the heat absorption element 100 and a high proportion of the heat absorption portion 20, which is beneficial to improving the sealing performance of the packaging portion 10 and the structural reliability of the heat absorption element 100, and is also beneficial to improving the heat absorption performance of the heat absorption element 100, reducing the preparation cost, and improving the preparation efficiency, thereby improving the use performance, safety performance and preparation efficiency of the battery assembly 300.

[0042] In the present invention, the sealing structure 12 seals the opening 110 of the packaging structure 11, thereby forming a packaging part 10 with a 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 present invention, a packaging structure 11 with only one opening 110 is adopted, so that the sealing structure 12 only needs to seal the opening 110, which greatly reduces the size ratio of the sealing structure 12 in the packaging part 10, which is beneficial to increase the volume ratio of the sealed space 13 in the packaging part 10, thereby increasing the ratio of the heat absorption part 20 and improving the heat absorption performance of the heat absorption part 100; at the same time, in the related art, there are many sealing parts, the probability of sealing failure is high, and the sealing reliability is reduced, while in the present invention, the size ratio of the sealing structure 12 is small, the probability of sealing failure is low, the sealing reliability of the packaging part 10 is improved, which is beneficial to encapsulating the heat absorption part 20 and improving the structural reliability of the heat absorption part 100.

[0043] The packaging structure 11 in the present invention has only one opening 110, and the opening 110 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 a sealed sealed space 13. The shapes of the packaging structure 11 and the opening 110 in the present invention can be selected as needed. For example, the packaging structure 11 can be, but not limited to, a cuboid, a cube, a cylinder, an irregular shape (such as a bag), etc., and the shape of the opening 110 can be, but not limited to, a rectangle, a square, a rhombus, a circle, a semicircle, an ellipse, an irregular shape, etc.

[0044] In the present invention, the packaging structure 11 has only 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 invention, the direction of the maximum side length of the surface of the heat absorbing member 100 facing 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 absorbing member 100 is a regular rectangular parallelepiped, the first direction (such as Figure 2 The direction indicated by the arrow in the middle is the length direction of the heat-absorbing member 100 / packaging portion 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 sealing structure 12 being arranged at one end in the width direction or thickness direction of the packaging structure 11, the sealing structure 12 is arranged at one end in the length direction of the packaging structure 11. The required sealed space is smaller, so that the proportion of the sealing structure 12 in the packaging portion 10 is smaller, which helps to further increase the size of the sealed space 13, thereby facilitating the arrangement of more heat-absorbing portions 20, and further improving the heat absorption performance of the heat-absorbing member 100. Therefore, when the sealing structure 12 is located at one end of the packaging structure 11 in the first direction, it is beneficial to further improve the heat absorption performance of the heat-absorbing member 100 and improve the safety of the battery assembly 300. In the utility model, for the same component, especially for a square structure component, the length direction of the component is greater than or equal to its width direction, and the width direction is greater than or equal to its thickness direction. In some embodiments of the utility model, the heat-absorbing member 100 is a cuboid, and the direction from the heat-absorbing portion 20 to the sealing structure 12 is the length direction of the heat-absorbing member 100.

[0045] In some embodiments of the present invention, the encapsulation structure 11 is an integrally formed structure. Exemplarily, the encapsulation structure 11 can be integrally formed by the encapsulation layer. Specifically, the encapsulation layer can be processed to form the encapsulation structure 11 of the desired shape and the opening 110. The thickness of the encapsulation layer is the thickness of the encapsulation structure 11. In some embodiments of the present invention, the thickness of the encapsulation structure 11 is 30 μm to 150 μm, which is conducive to improving the encapsulation effect of the encapsulation part 10 without increasing the thickness and weight of the heat absorber 100 too much. Specifically, the thickness of the encapsulation structure 11 can be, but is not limited to, 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 one embodiment, the thickness of the encapsulation structure 11 is 35 μm to 90 μm. In another embodiment, the thickness of the encapsulation structure 11 is 30 μm to 60 μm. In another embodiment, the thickness of the packaging structure 11 is 65 μm to 100 μm. In some embodiments of the present invention, the packaging structure 11 is an equal thickness structure, that is, the thickness of the packaging structure 11 is equal at all places. In other embodiments of the present invention, the packaging structure 11 is an unequal thickness structure, that is, the thickness of the packaging structure 11 is different at all places. In one embodiment, the packaging structure 11 includes a first part that is bonded to the battery 200 and a second part 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 absorption member 100 to conduct and absorb the heat generated by the battery 200 more quickly, while ensuring the structural reliability of the packaging part 10. It can be understood that the second part is not bonded to the battery 200.

[0046] In some embodiments of the present invention, please refer to Figure 5 ,for Figure 4An enlarged view of the dotted area, wherein the encapsulation structure 11 includes a corrosion-resistant layer 111, a metal layer 112 disposed on the surface of the corrosion-resistant layer 111 facing away from the heat absorption part 20, and an insulating layer 113 disposed on the surface of the metal layer 112 facing away from the corrosion-resistant layer 111. That is, the encapsulation layer includes the corrosion-resistant layer 111, the metal layer 112, and the insulating layer 113 stacked, and in the heat absorption part 100, the corrosion-resistant layer 111 is closer to the heat absorption part 20 than the metal layer 112 and the insulating layer 113. Among them, the corrosion-resistant layer 111 can prevent the heat absorption part 20 from corroding the packaging part 10, and improve the structural reliability of the packaging part 10. The metal layer 112 can reduce the water vapor transmission rate of the packaging part 10, avoid the influence of the external environment on the heat absorption part 20, and enhance the protection of the packaging part 10 on the heat absorption part 20. The insulating layer 113 ensures the insulation performance of the heat absorption element 100, which is conducive to the use of the heat absorption element 100 with the battery 200, and ensures the performance of the battery assembly 300. 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 absorption element 100. In some embodiments of the utility model, the thickness of the corrosion-resistant layer 111 is 30μm to 150μm, which can ensure that the packaging part 10 can package the heat absorption part 20 stably for a long time, and at the same time will not increase the thickness of the heat absorption element 100 too much, which is conducive to the use of the heat absorption element 100. Specifically, the thickness of the corrosion-resistant layer 111 may 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 one embodiment, the thickness of the corrosion-resistant layer 111 may be 30 μm to 75 μm. In another embodiment, the thickness of the corrosion-resistant layer 111 may be 50 μm to 100 μm. In yet another embodiment, the thickness of the corrosion-resistant layer 111 may be 100 μm to 150 μm. In some embodiments of the utility model, the thickness of the metal layer 112 is 3 μm to 20 μm, which is beneficial to reducing the water vapor permeability of the packaging part 10 and increasing the packaging effect of the packaging part 10, while not increasing the thickness of the heat absorber 100 too much, which is beneficial to the use of the heat absorber 100. Specifically, the thickness of the metal layer 112 may 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. In one embodiment, the thickness of the metal layer 112 may be 3 μm to 10 μm. In another embodiment, the thickness of the metal layer 112 may be 7 μm to 13 μm. In yet another embodiment, the thickness of the metal layer 112 may be 13 μm to 20 μm.In some embodiments of the present invention, the thickness of the insulating layer 113 is 5 μm to 20 μm, which is conducive to ensuring the insulation performance of the heat absorber 100, while not increasing the thickness of the heat absorber 100 too much, which is conducive to the use of the heat absorber 100. Specifically, the thickness of the insulating 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 one embodiment, the thickness of the insulating layer 113 can be 5 μm to 10 μm. In another embodiment, the thickness of the insulating layer 113 can be 10 μm to 15 μm. In yet another embodiment, the thickness of the insulating layer 113 can be 15 μm to 20 μm. In the present utility model, the material of the corrosion-resistant layer 111 may be, but is not limited to, a corrosion-resistant, inert plastic material, and the material of the insulating layer 113 may be, but is not limited to, an insulating plastic, or may be an insulating high-voltage resistant material to improve the impact resistance of the packaging structure 11. In some embodiments of the present utility model, the corrosion-resistant layer 111 includes at least one layer of a polypropylene layer and a polyethylene layer. Exemplarily, the corrosion-resistant layer 111 is a polypropylene layer or a polyethylene layer. In some embodiments of the present utility model, the metal layer 112 includes at least one layer of an aluminum layer, an aluminum alloy layer, a copper layer, a copper alloy layer, a zinc layer, and a zinc alloy layer. Exemplarily, the metal layer 112 is an aluminum layer. In some embodiments of the present utility model, the insulating layer 113 includes at least one layer of a polyethylene terephthalate layer and a polybutylene terephthalate layer. Exemplarily, the insulating layer 113 is a polyethylene terephthalate layer. In some embodiments of the present invention, the corrosion-resistant layer 111 is a polyethylene layer, the metal layer 112 is an aluminum layer, and the insulating layer 113 is a polyethylene terephthalate layer. The combination of the three can further reduce the water vapor permeability of the packaging part 10.

[0047] In the present invention, the sealing structure 12 seals the opening 110 of the packaging structure 11, so that the packaging part 10 forms a sealed space 13 for accommodating the heat absorption part 20. Figure 2 and Figure 3 , in the direction from the heat absorption part 20 to the sealing structure 12, the size of the sealing structure 12 is W 密 The direction from the heat absorbing part 20 to the sealing structure 12 is parallel to the first plane, and the first plane is the plane where the surface of the heat absorbing part 100 facing the battery 200 is located, that is, the width of the sealing structure 12 is W 密 , the length of the sealing structure 12 is the dimension of the sealing structure 12 in its extending direction, and the thickness of the sealing structure 12 is the dimension of the sealing structure 12 in the arrangement direction of the battery 200 and the heat absorbing member 100. In some embodiments of the present invention, W 密The width of the encapsulation structure 11 is 2 mm to 20 mm, which can form a closed sealed space 13 with the encapsulation structure 11, and at the same time, the size of the sealed space 13 in the encapsulation part 10 is increased, thereby increasing the effective use area of ​​the heat absorption part 20, improving the heat absorption performance of the heat absorption element 100, and also improving the sealing performance of the encapsulation part 10, and preventing the loss of the heat absorption part 20. Specifically, W 密 It can be, but is not limited to, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 7.5 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, or 20 mm. In one embodiment, W 密 It can be 2mm to 8mm. In another embodiment, W 密 It can be 3mm to 7mm. In another embodiment, W 密 It can be 7mm to 15mm. In another embodiment, W 密 It can be 13 mm to 20 mm. In some embodiments of the present invention, the sealing structure 12 is located at one end of the packaging structure 11 in the first direction. The direction from the heat absorption part 20 to the sealing structure 12 is the first direction.

[0048] The material of the sealing structure 12 in the utility model can be selected from corrosion-resistant and hot-melt materials, so as to facilitate the sealing of the sealing structure 12 to the opening 110. In some embodiments of the utility model, the sealing structure 12 may 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. Among them, 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 are not repeated here. When the sealing structure 12 and the packaging structure 11 have the corrosion-resistant layer 111, the metal layer 112 and / or the insulating layer 113 at the same time, the material and thickness selection 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. Exemplarily, the structural composition of the sealing structure 12 and the packaging structure 11 can be the same. In other embodiments of the utility model, the sealing structure 12 is a corrosion-resistant layer 111. In one embodiment, the sealing structure 12 may be a polypropylene layer or a polyethylene layer.

[0049] In some embodiments of the present invention, the packaging structure 11 has an end surface at its opening 110, and the sealing structure 12 is connected to the end surface to seal the opening 110. In other embodiments of the present invention, 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 still other embodiments of the present invention, the sealing structure 12 is connected to the end surface and the inner surface to seal the opening 110.

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

[0051] In some embodiments of the present invention, the volume of the sealed space 13 is V 密 , the volume of the heat absorbing part 20 is V 吸 , V 密 、V 吸 Satisfy: 90% ≤ V 吸 / V 密 ≤98%. Specifically, V 吸 / V 密It can be but not limited to 91%, 92%, 93%, 94%, 95%, 96% or 97%. In this way, the heat absorption part 20 does not completely fill the sealed space 13, so that there is residual space in the sealed space 13. After the heat absorption part 100 is subjected to external pressure, the packaging part 10 can undergo a certain deformation to resist the pressure, thereby avoiding the problem of failure of the heat absorption part 100 caused by the fracture between the sealing structure 12 and the packaging structure 11, the sealing structure 12 itself or the packaging structure 11 itself after being subjected to external pressure, thereby increasing the rupture pressure of the packaging part 10 and improving the impact resistance of the heat absorption part 100. Specifically, the rupture pressure of the packaging part 10 can be above 0.5MPa, and the reliability of the overall structure is improved. Among them, the test method of the rupture pressure is to use a sample machine to measure the compression stress-strain curve of the finished material. The core material size of the material sample is 50mm×50mm, the inlet force is 5N, the compression rate is 2mm / min, and the packaging film is compressed until the packaging film cracks, and the strength of the packaging film when it breaks is recorded. In some embodiments of the present invention, 91.7%≤V 吸 / V 密 ≤95%, so that the heat absorption element 100 has both better impact resistance and heat absorption performance.

[0052] In some embodiments of the present invention, the length of the sealed space 13 is L 空 , width W 空 , the length of the heat absorbing part 20 is L 吸 , width 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. In this way, there is residual space in the sealed space 13, which increases the rupture pressure of the packaging part 10 and improves the impact resistance of the heat absorber 100. Figure 2 In a specific embodiment, the length direction of the sealed space 13 corresponds to the length direction of the heat absorbing portion 20. Figure 2 In the left and right directions, the width direction of the sealed space 13 and the width direction of the heat absorbing portion 20 are perpendicular to Figure 2 In the left and right directions and the up and down directions. For example, L 空 -L 吸 It can be, but is not limited to, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm or 10 mm, etc. 空 -W 吸It can be, but is not limited to, 1 mm, 2 mm, 3 mm, 4 mm or 5 mm. Specifically, the rupture pressure of the packaging part 10 can be above 0.5 MPa, and the reliability of the overall structure is improved. 空 -L 吸 ≤10mm; 4mm≤W 空 -W 吸 ≤5mm, so that the heat absorption element 100 has both better impact resistance and heat absorption performance.

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

[0054] In the present invention, the heat absorbing part 20 is accommodated and fixed in the sealed space 13 of the packaging part 10. The heat absorbing part 20 has heat absorption performance, which ensures the heat absorption performance of the heat absorbing part 100. In some embodiments of the present invention, the heat absorbing part 20 includes a heat absorbing material. Exemplarily, the heat absorbing 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 its 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 one embodiment, the heat absorbing material includes water and / or ethanol. In other embodiments of the present invention, the heat absorbing part 20 includes a skeleton 21 and a heat absorbing material, and the skeleton 21 has a hole 211, and the heat absorbing material is arranged in the hole 211. The skeleton 21 has holes 211 running through the skeleton 21 in the thickness direction. The heat absorbing material is arranged in the holes 211 of the skeleton 21. The skeleton 21 supports and shapes the heat absorbing material, and at the same time can fix and restrict the position and movement of the heat absorbing material to a certain extent, so as to avoid the problem that the heat absorbing material moves too much and generates too much impact force on the packaging part 10, thereby reducing the service life. At the same time, by setting the position of the skeleton 21, the heat absorbing material is closer to the surface where the heat absorbing element 100 and the battery 200 are attached, thereby improving the response speed and response time of the heat absorption.

[0055] The size and shape of the frame 21, the shape, number and aperture of the holes 211 in the present invention can be set according to the heat absorption requirements of the heat absorber 100. For example, the holes 211 can be rectangular, cube, prism, cylindrical or irregular, and the number of holes 211 can be more than 5, more than 10, more than 30, more than 50, etc. In one embodiment, the openings of the holes 211 are regular hexagons, which can further improve the strength and service life of the frame 21. Please refer to Figure 6, is a schematic diagram of the structure of a skeleton provided in an embodiment of the utility model, wherein the skeleton 21 has a plurality of holes 211, and the heat absorbing material can be arranged in the holes 211. In some embodiments of the utility model, the skeleton 21 is a flexible skeleton 21, which can better fit on the cavity wall of the sealed space 13, thereby improving the heat absorption performance of the heat absorbing member 100. In one embodiment, the skeleton 21 includes a polypropylene skeleton. In some embodiments of the utility model, the thickness of the skeleton 21 is 0.1 mm to 10 mm, which can support and limit the heat absorbing material, while not increasing the thickness and weight of the heat absorbing member 100 too much, which is conducive to the use of the heat absorbing member 100. Along the arrangement direction of the battery 200 and the heat absorbing member 100, the size of the skeleton 21 is the thickness of the skeleton 21. Specifically, the thickness of the skeleton 21 can be, but is not limited to, 0.1 mm, 0.3 mm, 0.7 mm, 1 mm, 1.5 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm or 10 mm, etc. In one embodiment, the thickness of the skeleton 21 may be 0.1 mm to 2 mm. In another embodiment, the thickness of the skeleton 21 may be 1 mm to 5 mm. In yet another embodiment, the thickness of the skeleton 21 may be 5 mm to 10 mm. The heat absorbing part 20 may have one or more skeletons 21. In some embodiments of the utility model, the heat absorbing part 20 includes a plurality of skeletons 21, and the plurality of skeletons 21 are stacked along the thickness direction thereof, and the holes 211 of adjacent skeletons 21 are connected. By providing a plurality of skeletons 21, more heat absorbing materials can be better supported and restricted, and the connected holes 211 ensure the movement of the heat absorbing materials in the plurality of skeletons 21, further improving the performance of the heat absorbing part 100. In some embodiments of the utility model, the thickness of the skeleton 21 is less than the thickness of the heat absorbing material. In some embodiments of the utility model, the aperture of the hole 211 is 3 mm to 4 mm, which is conducive to the movement and phase change of the heat absorbing material, further improving the heat absorption performance of the heat absorbing part 100. The diameter of the hole 211 is the maximum size of the hole 211 in a plane perpendicular to the thickness direction of the frame 21. In one embodiment, the diameter of the hole 211 may be 3 mm to 3.5 mm. In another embodiment, the diameter of the hole 211 may be 3.5 mm to 4 mm.

[0056] See also Figure 2 , along the direction perpendicular to the surface of the battery 200 facing the heat sink 100, that is, along the arrangement direction of the battery 200 and the heat sink 100, the size of the heat sink 20 is d 吸 , that is, the thickness d of the heat absorbing portion 20 吸 In some embodiments of the present invention, d 吸The thickness of the heat absorbing member 100 is 0.5 mm to 50 mm, which not only ensures the proportion of the heat absorbing portion 20 in the heat absorbing member 100 and improves the heat absorbing performance of the heat absorbing member 100, but also does not increase the thickness of the sealing space 13 too much and reduces the thickness of the heat absorbing member 100. Specifically, d 吸 It can be, but is not limited to, 0.5 mm, 0.8 mm, 1 mm, 1.5 mm, 2 mm, 2.7 mm, 3 mm, 3.5 mm, 5 mm, 8 mm, 10 mm, 13 mm, 15 mm, 20 mm, 22 mm, 27 mm, 30 mm, 35 mm, 40 mm, 43 mm, 45 mm, 47 mm, or 50 mm. In one embodiment, d 吸 It can be 0.5 mm to 10 mm. In another embodiment, d 吸 It can be 10 mm to 25 mm. In another embodiment, d 吸 It can be 20 mm to 35 mm. In another embodiment, d 吸 It can be 30 mm to 50 mm. In another embodiment, d 吸 It can be 0.5 mm to 5 mm, so that the heat absorption element 100 has both better heat absorption performance and light weight.

[0057] See also Figure 1 On the surface of the battery 200 facing the heat sink 100, the maximum side length of the battery 200 is L 电 , that is, the length of the battery 200 is L 电 In some embodiments of the present invention, L 电 500mm to 1200mm. Specifically, L 电 It may be, but is not limited to, 500 mm, 550 mm, 580 mm, 600 mm, 650 mm, 700 mm, 720 mm, 750 mm, 800 mm, 850 mm, 900 mm, 950 mm, 1000 mm, 1050 mm, 1100 mm, or 1200 mm. In one embodiment, L 电 It can be 500mm to 800mm. In another embodiment, L 电 It can be 700mm to 1000mm. In another embodiment, L 电 It can be 1000mm to 1200mm. In another embodiment, L 电 It can be 500mm to 1000mm. In some embodiments of the present invention, the battery 200 is a rectangular parallelepiped; L 电 is the length of the battery 200 ; a direction perpendicular to the surface of the battery 200 facing the heat absorbing member 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 inventor of the utility model found through a series of studies that L电 ,d 吸 , W 密 Meet: 50mm≤L 电 ×d 吸 / W 密 When L is less than 200 mm, the size of the sealing structure 12 can be reduced, the effective use area of ​​the heat absorption part 20 can be increased, the heat absorption effect of the heat absorption element 100 on the battery 200 can be improved, and the sealing effect of the heat absorption element 100 can be improved, which greatly improves the performance of the battery assembly 300. 电 ×d 吸 / W 密 The lower limit of L can 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., L 电 ×d 吸 / W 密 The upper limit of L may be, but is not limited to, 90 mm, 95 mm, 100 mm, 105 mm, 110 mm, 115 mm, 120 mm, 130 mm, 135 mm, 140 mm, 145 mm, 150 mm, 155 mm, 160 mm, 165 mm, 170 mm, 175 mm, 180 mm, 190 mm, 195 mm or 200 mm, etc. Specifically, L 电 ×d 吸 / W 密 It 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 invention, L 电 ,d 吸 , W 密 Meet: 120mm≤L 电 ×d 吸 / W 密 ≤180mm, which is beneficial to further increase the space occupied by 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 performance of the battery assembly 300.

[0059] In some embodiments of the present invention, the battery 200 includes a battery body 201 and a positive electrode column 202 and a negative electrode column 203 disposed on the battery body 201. In one embodiment, the positive electrode column 202 and the negative electrode column 203 are disposed at the same end of the battery body 201. In another embodiment, the positive electrode column 202 and the negative electrode column 203 are disposed at two ends of the battery body 201. Figure 7 , is a cross-sectional schematic diagram of a battery assembly provided by an embodiment of the utility model, the orthographic projection of the heat absorbing member 100 on the plane where the surface of the battery body 201 is located does not have an overlapping area with the orthographic projections of the positive electrode column 202 and the negative electrode column 203 on the plane, thus ensuring the connection between the multiple positive electrode columns 202 and the negative electrode columns 203 in the battery pack 400. In one embodiment, the orthographic projection area of ​​the heat absorbing member 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. Exemplarily, the orthographic projection area of ​​the heat absorbing member 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 absorbing member 100 on the battery 200 can be further improved, and the performance of the battery assembly 300 can be improved. In some other embodiments of the present invention, the battery 200 further includes a shell having a cavity, and the battery body 201 is disposed in the cavity.

[0060] In some embodiments of the utility model, a heat absorbing portion 20 may be provided in the packaging structure 11, and the opening 110 of the packaging structure 11 may be sealed by a sealing structure 12 to obtain a heat absorbing member 100. In one embodiment, a composite film may be used to process the packaging structure 11, and after the heat absorbing portion 20 is provided, the composite film at the opening 110 is heated to form a sealing structure 12. In another embodiment, the composite film may be inflated into a bag-like structure, and after the heat absorbing portion 20 is provided, the composite film at the opening 110 is heated to form a sealing structure 12. Specifically, the composite film may include, but is not limited to, a corrosion-resistant layer 111, a metal layer 112, and an insulating layer 113 stacked and arranged, and the formed sealing structure 12 may be the same as the composite film, or may only have the corrosion-resistant layer 111. Exemplarily, the corrosion-resistant layer 111 in the composite film may be hot-melt connected to form a sealing structure 12; for example, the hot-melt connection may be produced by a heat sealing machine to produce a hot-pressed edge seal. The preparation method is simple and easy to operate, improves the preparation efficiency and air tightness of the heat absorber 100, reduces the preparation cost, and is beneficial to the use of the heat absorber 100 and the battery assembly 300.

[0061] The utility model 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 performance, and the heat generated during use can be absorbed in time, avoiding the battery 200 from being at high temperature, thereby improving the safety of the battery pack 400.

[0062] In some embodiments of the present invention, the battery pack 400 includes a plurality of battery assemblies 300, the plurality of battery assemblies 300 include a plurality of batteries 200 and a plurality of heat sinks 100, and the plurality of batteries 200 and the plurality of heat sinks 100 are alternately arranged. Figure 8 , is a schematic diagram of the structure of a battery pack provided by an embodiment of the utility model, wherein the battery pack 400 includes two battery assemblies 300, and the batteries 200 and the heat absorber 100 are alternately arranged in the battery pack 400. In the stacking direction of the multiple battery assemblies 300, the heat absorber 100 may be located at the outermost side in the battery pack 400, or the battery 200 may be located at the outermost side. Exemplarily, in the stacking direction of the battery assemblies 300, the heat absorber 100 is located at the outermost side, or the battery 200 is located at the outermost side, or the outermost side of one end is the heat absorber 100, and the outermost side of the other end is the battery 200.

[0063] The utility model provides an electric device, including the battery pack 400 in any of the above embodiments. The electric device has excellent performance and strong product competitiveness. The electric device may refer to a vehicle, an electronic device (such as a mobile phone, a computer, a camera, etc.), an energy storage system, etc.

[0064] The effects of the technical solution of the utility model are further illustrated below through specific examples.

[0065] Examples 1-10

[0066] A battery assembly comprises a battery and a heat absorber arranged on the surface of the battery, the heat absorber comprises a packaging part and a heat absorber, the packaging part has a sealed space inside, the heat absorber is arranged in the sealed space, the packaging part comprises a packaging structure and a sealing structure (polyethylene), the packaging structure has only one opening, and the sealing structure is arranged at the opening to form a sealed space; wherein the composite film is a polyethylene layer, an aluminum layer and a polyethylene terephthalate layer stacked, the composite film is blown into a bagged packaging structure and then filled with the heat absorber, a sealing structure that seals the opening of the packaging structure is formed by heat sealing, and the heat absorbing material is a hydrogel; the difference between embodiments 1-10 lies in the different structural dimensions.

[0067] Comparative Example 1-2

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

[0069] Comparative Example 3

[0070] It is roughly the same as Example 1, except that the four sides of the two-layer composite film are heat-sealed by a heat sealer, and the heat absorption part is filled in the process to form a heat absorption part, and the structural size is different from that of Example 1.

[0071] The L in the battery assemblies of the embodiments and comparative examples 电 ,d 吸 , W 密 Test, the unit is mm, L 电 ,d 吸 , W 密 Substitute the value of L 电 ×d 吸 / W 密 In the 电 ×d 吸 / W 密 The results are shown in Table 1. 密 、V 吸 , L 空 , L 吸 , W 空 , W 吸 Carry out the test, the unit is mm, calculate V 吸 / V 密 , L 空 -L 吸 , W 空 -W 吸 The results are shown in Table 2. The sealing tension (i.e., sealing strength) of the heat absorbing member in the battery assembly of the embodiment and the comparative example and the heat absorption per unit area of ​​the heat absorbing member are tested, and the results are shown in Table 3; wherein the sealing tension testing method is: the sealed composite film in the heat absorbing member is cut into a sealing edge of 15 mm wide (the sealing edge can be formed by heat sealing), and the two sides of the cut composite film sealing edge are clamped by a tensile machine. When the bonding part of the composite film sealing edge is completely separated (i.e., the opening sealed together is pulled open), the force of the tensile machine is recorded as the sealing tension strength; the heat absorption per unit area detection method is: the enthalpy value of the heat absorbing material is detected by differential scanning calorimetry, and the enthalpy value is A, and the unit is kJ / kg; the heat absorbing member is placed in an oven for drying until its mass does not change, and the mass change of the heat absorbing member before and after drying is recorded as M, and the unit is kg. The heat absorption is the product of A and M, and the heat absorption per unit area = heat absorption / (area of ​​the sealed space) = heat absorption / (L 空 ×W 空 ).

[0072] Table 1 Dimensional test results 1

[0073] <![CDATA[L 电 (mm)]]> <![CDATA[d 吸 (mm)]]> <![CDATA[W 密 (mm)]]> <![CDATA[L 电 ×d 吸 / W 密 (mm)]]> Example 1 960 1 5 192 Example 2 960 1 6 160 Example 3 960 1 8 120 Example 4 960 1 8 120 Example 5 960 1 8 120 Example 6 960 1 10 96 Example 7 960 1 12 80 Example 8 960 1 15 64 Example 9 580 1 10 58 Example 10 500 5 20 125 Comparative Example 1 960 1 2 480 Comparative Example 2 960 1 3 320 Comparative Example 3 960 0.5 20 24

[0074] Table 2 Dimension test results 2

[0075]

[0076]

[0077] Table 3 Performance test results

[0078] Seal tensile force (N) <![CDATA[Heat absorption per unit area (kW / m 2 )]]> Example 1 80 2254.736842 Example 2 82 2254.711674 Example 3 86 2245.056497 Example 4 85 2254.661017 Example 5 86 2261.864407 Example 6 90 2254.609929 Example 7 95 2254.558405 Example 8 109 2254.480287 Example 9 113 2264.705882 Example 10 83 11005.43478 Comparative Example 1 58 2254.811715 Comparative Example 2 68 2254.786862 Comparative Example 3 118 1121.014493

[0079] It can be seen that in Comparative Example 1-2, L 电 ×d 吸 / W 密 The result is greater than 200mm, so that although the heat absorbing element has a good heat absorbing effect, the sealing ability of the heat absorbing element is poor, which is not conducive to the use of the heat absorbing element; in comparative example 3, L 电 ×d 吸 / W 密 The result is less than 50mm, and the comparative example 3 adopts the method of sealing all around, and the sealing edge accounts for a large proportion, which greatly affects the heat absorption performance of the heat absorber; while the packaging structure of the heat absorber in the embodiment of the present application has only one opening, and the sealing performance of the heat absorber is ensured by single-side sealing, and L 电 ×d 吸 / W 密 The result is between 50 mm and 200 mm, so that the heat absorber also has excellent heat absorption performance, which is beneficial to the use of the heat absorber and the battery assembly.

[0080] The above-described embodiment only expresses one embodiment of the present invention, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the design concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the attached claims.

Claims

1. A battery assembly, characterized in that: The invention comprises a battery and a heat absorbing member arranged on the surface of the battery, wherein the heat absorbing member comprises a packaging part and a heat absorbing part, wherein the packaging part has a sealed space inside, wherein the heat absorbing part is arranged in the sealed space, wherein the packaging part comprises a packaging structure and a sealing structure, wherein the packaging structure has an opening on one side, and wherein the sealing structure is 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 L 电 , In the direction perpendicular to the surface of the battery facing the heat absorbing member, the size of the heat absorbing portion is d 吸 , In the direction from the heat absorption part to the sealing structure, the size of the sealing structure is W 密 , The L 电 , the 吸 , the W 密 Meet: 50mm≤L 电 ×d 吸 / W 密 ≤200mm.

2. The battery assembly according to claim 1, characterized in that 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 according to claim 2, characterized in that: The V 密 , the V 吸 satisfy: 91.7%≤V 吸 / V 密 ≤95%.

4. The battery assembly according to any one of claims 1 to 3, characterized in that: The length of the sealed space is L 空 , width W 空 , The length of the heat absorbing part is L 吸 , width 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 according to claim 4, characterized in that: 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 according to claim 1, wherein: The battery assembly satisfies at least one of the following (a), (b) and (c): (a) L 电 500mm to 1200mm; (b) d 吸 0.5mm to 50mm; (c) W 密 2mm to 20mm.

7. The battery assembly according to claim 6, characterized in that The battery assembly meets the following requirements: The L 电 500mm to 1000mm; and / or The d 吸 0.5mm to 5mm.

8. The battery assembly according to claim 1, wherein: On the surface of the heat absorbing member facing the battery, an extending direction of a maximum side length of the heat absorbing member is a first direction, and the sealing structure is located at one end of the packaging structure in the first direction.

9. The battery assembly according to claim 1, wherein: The packaging structure comprises a corrosion-resistant layer, a metal layer arranged on a surface of the corrosion-resistant layer away from the heat absorption portion, and an insulating layer arranged on a surface of the metal layer away from the corrosion-resistant layer; and / or The sealing structure includes a corrosion-resistant layer, a metal layer arranged on a surface of the corrosion-resistant layer away from the heat absorption portion, and an insulating layer arranged on a surface of the metal layer away from the corrosion-resistant layer.

10. The battery assembly according to claim 9, characterized in that 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 30 μm to 150 μm; (e) the thickness of the metal layer is 3 μm to 20 μm; (f) the thickness of the insulating layer is 5 μm to 20 μm; (g) The packaging portion has a thickness of 30 μm to 100 μm.

11. The battery assembly according to claim 9 or 10, characterized in that: 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 layer selected from the group consisting 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 includes at least one of a polyethylene terephthalate layer and a polybutylene terephthalate layer.

12. The battery assembly according to claim 1, wherein: The water vapor transmission rate of the packaging part is less than or equal to 0.02g / (m 2 ·24h).

13. The battery assembly according to claim 1, wherein: The heat absorbing part comprises a frame and a heat absorbing material, the frame has holes, and the heat absorbing material is arranged in the holes.

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

15. The battery assembly according to claim 1, wherein: The battery is a rectangular parallelepiped; the L 电 is the length of the battery; the direction perpendicular to the surface of the battery facing the heat absorber 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 according to claim 1, wherein: The heat absorbing element is a rectangular parallelepiped, and the direction from the heat absorbing portion to the sealing structure is the length direction of the heat absorbing element.

17. A battery pack, characterized in that: Comprising at least one battery assembly according to any one of claims 1 to 16.

18. The battery pack according to claim 17, wherein: The battery pack includes a plurality of the battery assemblies, and the plurality of the battery assemblies include 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 arranged.

19. An electrical equipment, characterized in that: Comprising the battery pack as claimed in claim 17 or 18.

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