Outer coating film, energy storage device, and power consumption device

Abstract

To provide an energy storage device including an external coating film that can improve the consistency of the energy storage device.SOLUTION: An energy storage device includes a body, an external coating film 200 including an adhesive layer applied to the body, and a housing 10, The external coating film is provided with a first cut groove and a second cut groove, both penetrating the thickness direction of the side film part and the outer edge of the side film part, and both having a bottom surface spaced from an inner edge of the side film part. A first oblique fold 240 and a second oblique fold 250 are provided in each side film part. A first free end of the first oblique fold is provided intersecting a side of the first cut groove. The distance between the first free end and the bottom of the first cut groove is greater than 0. A second free end of the second oblique fold is provided intersecting a side surface of the second cut groove. The distance between the second free end and the bottom surface of the second cut groove is greater than 0.SELECTED DRAWING: Figure 11

Description

Technical Field

[0001] This application relates to the technical field of energy storage devices, and particularly to an external coating film, an energy storage device, and a power consumption device.

Background Art

[0002] The housing of an energy storage device is generally made of metal and has conductivity. Therefore, it is necessary to coat the housing of the energy storage device with an insulating external coating film. A power consumption device generally uses hundreds to thousands of energy storage devices simultaneously. To ensure the long service life of the power consumption device, high consistency of the energy storage device is required. In the prior art, usually, it is often coated with an external coating film. During coating, an adhesive layer is applied to both the part of the external coating film protruding from the side plate of the energy storage device and the part of the external coating film protruding from the bottom plate of the energy storage device. Because it is easy to stick, it is easy to shift during pasting, and consequently, the consistency of the energy storage device is affected.

Summary of the Invention

[0003] An object of this application is to provide an external coating film, an energy storage device, and a power consumption device that can improve consistency.

[0004] In the present application, an energy storage device is provided. The energy storage device includes an outer coating film and a housing. The outer coating film includes a main body and an adhesive layer applied to the main body. The housing includes a bottom plate, two facing panel plates, and two facing side plates. The bottom plate is fixedly connected to the bottom sides of the two side plates, and the two panel plates are respectively fixedly connected between the two side plates and are fixedly connected to the bottom plate. The outer coating film includes two side film portions, a bottom film portion, a first face film section, and a second face film section. The two side film portions are respectively located at opposite ends of the outer coating film and respectively cover the outer surfaces of the two side plates. The bottom film portion is connected between the two side film portions and covers the outer surface of the bottom plate. The first face film section and the second face film section are located on opposite sides of the bottom film portion, are respectively connected between the two side film portions, and respectively cover the outer surfaces of the two panel plates. Each side film portion is provided with a first cut groove and a second cut groove provided at an interval from the first cut groove. Both the first cut groove and the second cut groove penetrate the side film portion along the thickness direction of the side film portion and penetrate the outer edge of the side film portion. The bottom surfaces of both the first cut groove and the second cut groove are provided at an interval from the inner edge of the side film portion. The first cut grooves of the two side film portions are respectively located on opposite sides of the bottom film portion. The second cut grooves of the two side film portions are respectively located on opposite sides of the bottom film portion and are located on one side of the first cut groove away from the first face film section. Each side film portion is provided with a first diagonal fold and a second diagonal fold. The first diagonal fold is located on one side of the first cut groove away from the second cut groove. The first diagonal fold includes a first fixed end and a first free end. The first fixed end is the intersection of the side film portion, the first face film section, and the bottom film portion. The first free end is provided to intersect the side surface of the first cut groove, and the distance between the first free end and the bottom surface of the first cut groove is greater than zero. The second slant fold line is located on one side of the second cut groove away from the first cut groove. The second slant fold line includes a second fixed end and a second free end. The second fixed end is the intersection of the side film portion, the second surface film portion, and the bottom film portion. The second free end is provided intersecting the side surface of the second cut groove, and the distance between the second free end and the bottom surface of the second cut groove is greater than zero.

[0005] In the present application, an energy storage device is provided. The side film portion of the outer coating film can be folded along a first slant fold line and a second slant fold line so as to be coated and attached to the side plate of the energy storage device. When actually forming the actual fold lines of the first slant fold line and the second slant fold line, usually, a reference fold line is set in advance. During actual formation, since the first free end of the first slant fold line and the second free end of the second slant fold line usually deviate from the reference fold line, and the degree of deviation from the reference fold line may be different, there is a problem that misalignment easily occurs when the side film portion covers the side plate. In the present application, a first cut groove is provided in the side film portion, and the distance by which the bottom surface of the first cut groove protrudes from the first free end of the first slant fold line is set to be greater than 0. Thereby, when forming the first slant fold line, even if the first free end of the actual fold line of the first slant fold line deviates to either side of the reference fold line, it is ensured that none of the first free ends of the first slant fold line protrude from the bottom surface of the first cut groove, that is, it is ensured that the first cut groove is not cut too much with respect to the first slant fold line. Therefore, the region of the side film portion located on one side of the first cut groove away from the second cut groove can be firmly attached to the side plate, and it is ensured that no wrinkles occur. Therefore, it is ensured that misalignment is less likely to occur when the first portion covers the side plate. Further, a second cut groove is provided in the side film portion, and the distance by which the bottom surface of the second cut groove protrudes from the second free end of the second slant fold line is set to be greater than 0. Thereby, when forming the second slant fold line, even if the second free end of the actual fold line of the second slant fold line deviates to either side of the reference fold line, it is ensured that none of the second free ends of the second slant fold line protrude from the bottom surface of the second cut groove, that is, it is ensured that the second cut groove is not cut too much with respect to the second slant fold line. Therefore, the region of the side film portion located on one side of the second cut groove away from the first cut groove can be firmly attached to the side plate, and it is ensured that no wrinkles occur. Therefore, it is ensured that misalignment is less likely to occur when the side film portion covers the side plate.

[0006] Further, even if the deviations of the first and second diagonal creases from the reference crease are different, it is ensured that no wrinkles occur when the side film portion covers the side plate, avoiding the problem of swelling when the side plate is covered, and ensuring that misalignment is less likely to occur when the side film portion covers the side plate. Thereby, the consistency of the energy storage device is ensured, and it is also advantageous for improving the lifespan of the power consumption device.

[0007] Also, in the external coating film, even without folding the bottom film portion, it is possible to completely cover the outer surface of the bottom plate with the bottom film portion. Thereby, the problem of wrinkles caused by folding and covering when covering the bottom plate is avoided, and the consistency of the energy storage device is further ensured.

[0008] In one possible embodiment, in each side film portion, the distance between the first free end and the bottom surface of the first cut groove is H1, and 0.1 mm ≤ H1 ≤ 5.5 mm. Thereby, the overcut amount of the first cut groove with respect to the first fold line is ensured, and even if the first free end of the first fold line is displaced toward the bottom surface of the first cut groove with respect to the reference fold line, no wrinkles will occur. Also, when bending along the first fold line so as to be attached to the side plate, the region of the side film portion (i.e., the first portion) located on one side of the first cut groove away from the second cut groove is bent so as to cover the region of the side film portion (i.e., the third portion) between the first cut groove and the second cut groove, and the bubbles generated can be extruded. Therefore, the firmness of the attachment of the outer coating film can be further improved. The distance between the second free end and the bottom surface of the second cut groove is H2, and 0.1 mm ≤ H2 ≤ 5.5 mm. Thereby, the overcut amount of the second cut groove with respect to the second fold line is ensured, and even if the second free end of the second fold line is displaced toward the bottom surface of the second cut groove with respect to the reference fold line, no wrinkles will occur. Also, when bending along the second fold line so as to be attached to the side plate, the region of the side film portion (i.e., the second portion) located on one side of the second cut groove away from the first cut groove is bent so as to cover the region of the side film portion (i.e., the third portion) between the first cut groove and the second cut groove, and the bubbles generated can be extruded. Therefore, the firmness of the attachment of the outer coating film can be further improved.

[0009] In one possible embodiment, in each side film portion, in the direction extending from the first fixed end toward the first free end, the angle formed by the first fold line and the inner edge of the side film portion is θ1, and 15° ≤ θ1 ≤ 75°. In the direction extending from the second fixed end toward the second free end, the angle formed by the second fold line and the inner edge of the side film portion is θ2, and 15° ≤ θ2 ≤ 75°.

[0010] In one possible embodiment, in each side film portion, the distance between the first free end and the inner edge of the side film portion is W1, the distance between the second free end and the inner edge of the side film portion is W2, and W1 and W2 are equal.

[0011] In one possible embodiment, in each side film portion, the distance between the bottom surface of the first cut groove and the inner edge of the side film portion is W3, the distance between the bottom surface of the second cut groove and the inner edge of the side film portion is W4, and W3 and W4 are equal. This is advantageous for forming the first cut groove and the second cut groove based on the same cutting criterion.

[0012] In one possible embodiment, the depth extending from the opening of the first cut groove to the bottom surface of the first cut groove is Z1, 10 mm ≤ Z1 ≤ 18 mm, the depth extending from the opening of the second cut groove to the bottom surface of the second cut groove is Z2, and 10 mm ≤ Z2 ≤ 18 mm.

[0013] In one possible embodiment, the extending direction from the opening of the first cut groove to the bottom surface of the first cut groove and the extending direction from the opening of the second cut groove to the bottom surface of the second cut groove are parallel. Thereby, the cutting equipment does not need to adjust the angle, and only by translating the outer coating film, the first cut groove and the second cut groove can be rapidly formed.

[0014] In one possible embodiment, the extending direction from the opening of the first cut groove to the bottom surface of the first cut groove intersects the outer edge of the side film portion and is not perpendicular, and the extending direction from the opening of the second cut groove to the bottom surface of the second cut groove intersects the outer edge of the side film portion and is not perpendicular. Thereby, the region of the side film portion between the first cut groove and the second cut groove (i.e., the third portion) presents a trapezoid with a smaller upper end and a larger lower end. As a result, the attachment between the third portion and the side plate becomes stronger and it is less likely to break.

[0015] In one possible embodiment, in each side film portion, the distance between the outer edge and the inner edge of the side film portion is L, the side plate has a width D1 extending along the thickness direction of the housing, and 1 / 2 < L / D1 < 1. Thereby, after the portion of the outer coating film located on one side of the first cut groove away from the second cut groove and the portion of the outer coating film located on one side of the second cut groove away from the first cut groove are alternately folded, and a part of them overlaps, the side film portion can completely cover the side plate. Also, due to the excessive size of the outer coating film, the portion of the outer coating film located on one side of the first cut groove away from the second cut groove and the portion of the outer coating film located on one side of the second cut groove away from the first cut groove respectively protrude from the edge of the side plate and cover the side plate overlappingly, thereby avoiding the problem that wrinkles and bulges will appear after the side film portions overlap. Therefore, the consistency of the energy storage device is ensured.

[0016] In one possible embodiment, each side film portion includes a first portion, a second portion, and a third portion. The third portion is connected between the first portion and the second portion. The first portion and the third portion are defined by the first folding line and the first cut groove, and the second portion and the third portion are defined by the second folding line and the second cut groove. The third portions of the two side film portions are respectively connected to opposite sides of the bottom film portion.

[0017] In one possible embodiment, the housing further includes a top cover. The top cover is provided opposite to the bottom plate and is fixedly connected to the top sides of the two side plates and the top sides of the two face plates. The outer coating film further includes two top film portions. One top film portion is fixedly connected to one side of the two side film portions and is connected to the first face film portion. The other top film portion is fixedly connected to the other side of the two side film portions and is connected to the second face film portion. The two top film portions cover the outer peripheral edge of the top surface of the top cover.

[0018] In one possible embodiment, the top surface of the top cover includes an attachment region and an edge region surrounding the attachment region. The two top film portions cover at least a part of the edge region. The minimum width of the edge region is K, the maximum width of the top film portion is G, and G ≤ K. Thereby, while the top film portion covers a part of the edge region, the attachment region is exposed, and interference with the components in the attachment region can be avoided.

[0019] In one possible embodiment, the energy storage device further includes a top patch. The top patch is attached to the top surface of the top cover away from the side plate and covers the top film portion. A hollow portion is provided in the top patch. The hollow portion penetrates the top patch along the thickness direction of the top patch. The minimum distance between the outer peripheral surface of the top patch and the peripheral surface of the hollow portion is J, and G < J. Thereby, the top patch can completely cover the top film portion, the top film portion is not exposed from the hollow portion of the top patch, and warping of the top film portion during subsequent processes is avoided.

[0020] In one possible embodiment, G < J < K. Thereby, after attaching the top patch, it is avoided that the outer peripheral surface of the top patch protrudes from the outer peripheral surface of the top cover body and peeling occurs. Also, the two hollow portions sleeve the outer peripheral surface of the attachment region so that the components in the attachment region are exposed.

[0021] In one possible embodiment, (K - J) < (J - G). Thereby, the top patch can not only completely cover the top film portion, but also be attached to a part of the top surface of the top cover to further crimp the top film portion, and warping of the top film portion is avoided.

[0022] In one possible embodiment, in each side film portion, the distance between the outer edge and the inner edge of the side film portion is L, the depth extending from the opening of the first cut groove to the bottom surface of the first cut groove is Z1, the width of the bottom film portion is D2, and (2L - D2) < Z1 < L.

[0023] In one possible embodiment, in each side film portion, the distance between the outer edge and the inner edge of the side film portion is L, the depth extending from the opening of the second cut groove to the bottom surface of the second cut groove is Z2, the width of the bottom film portion is D2, and (2L - D2) < Z2 < L.

[0024] In the present application, a power consumption device is provided. The power consumption device includes the above energy storage device, and the energy storage device supplies power to the power consumption device.

[0025] In the present application, an external coating film is further provided. The external coating film is used for pasting the housing of the energy storage device. The external coating film includes a main body and an adhesive layer applied to the main body. The housing includes a bottom plate, two facing panel plates, and two facing side plates. The bottom plate is fixedly connected to the bottom sides of the two side plates, and the two panel plates are respectively fixedly connected between the two side plates and are fixedly connected to the bottom plate. The external coating film includes two side film portions, a bottom film portion, a first surface film portion, and a second surface film portion. The two side film portions are respectively located at opposite ends of the external coating film and are used for covering the outer surfaces of the two side plates respectively. The bottom film portion is connected between the two side film portions and is used for covering the outer surface of the bottom plate. The first surface film portion and the second surface film portion are located on opposite sides of the bottom film portion, are respectively connected between the two side film portions, and are used for covering the outer surfaces of the two panel plates respectively. Each side film part is provided with a first cut groove and a second cut groove provided at an interval from the first cut groove. Both the first cut groove and the second cut groove penetrate the side film part along the thickness direction of the side film part and penetrate the outer edge of the side film part. The bottom surface of the first cut groove and the bottom surface of the second cut groove are both provided at an interval from the inner edge of the side film part. The first cut grooves of the two side film parts are respectively located on both opposite sides of the bottom film part. The second cut grooves of the two side film parts are respectively located on both opposite sides of the bottom film part and are located on one side of the first cut groove away from the first surface film part. The depth extending from the opening of the first cut groove toward the bottom surface of the first cut groove is Z, and the depth extending from the opening of the second cut groove toward the bottom surface of the second cut groove is Z. In each side film part, the distance between the outer edge and the inner edge of the side film part is L, the width of the bottom film part is D2, and (2L - D2) < Z < L.

[0026] In one possible embodiment, Each side film part is provided with a first diagonal fold and a second diagonal fold. The first diagonal fold is located on one side of the first cut groove away from the second cut groove. The first diagonal fold includes a first fixed end and a first free end. The first fixed end is the intersection of the side film part, the first surface film part, and the bottom film part. The first free end is provided to intersect the side surface of the first cut groove, and the distance between the first free end and the bottom surface of the first cut groove is greater than 0. The second diagonal fold is located on one side of the second cut groove away from the first cut groove. The second diagonal fold includes a second fixed end and a second free end. The second fixed end is the intersection of the side film part, the second surface film part, and the bottom film part. The second free end is provided to intersect the side surface of the second cut groove, and the distance between the second free end and the bottom surface of the second cut groove is greater than 0.

[0027] In one possible embodiment, the outer coating film is integrally formed and presents a rectangle. This is advantageous for cutting and forming the material of the outer coating film, reducing the processing steps, and cost reduction. To more clearly explain the technical solutions in the embodiments of this application or the prior art, the drawings necessary for the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described are only some embodiments of this application, and those skilled in the art can obtain other drawings from these drawings without creative efforts.

Brief Description of the Drawings

[0028]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

[0029] Hereinafter, with reference to the drawings of the embodiments of the present application, the technical solutions of the embodiments of the present application will be clearly and comprehensively described. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments that can be obtained by those skilled in the art without creative efforts belong to the protection scope of the present application.

[0030] Referring to FIG. 1, FIG. 1 is a schematic diagram showing the structure of a power consumption device 1 according to an embodiment of the present application.

[0031] The power consumption device 1 includes an energy storage device 1000, and the energy storage device 1000 is used to supply power to the power consumption device 1. Exemplarily, the power consumption device 1 includes devices such as vehicles, electronic devices, and drones. Note that the electronic devices include laptops, tablets, mobile phones, and the like. In the embodiments of the present application, the vehicle is taken as an example to describe the power consumption device 1.

[0032] Referring to FIGS. 2 and 3, FIG. 2 is a schematic diagram showing the structure of the energy storage device 1000 in the power consumption device 1 shown in FIG. 1. FIG. 3 is a structural diagram showing that the housing assembly 100 is covered by an external coating film 200 in the energy storage device 1000 shown in FIG. 2.

[0033] For convenience of explanation, the width direction of the energy storage device 1000 shown in FIG. 2 is defined as the X-axis direction, the thickness direction of the energy storage device 1000 is defined as the Y-axis direction, and the height direction of the energy storage device 1000 is defined as the Z-axis direction. When the energy storage device 1000 is described in the embodiments of the present application, the orientation terms such as "top", "bottom", "left", and "right" are described according to the orientation shown in FIG. 2 of the drawings in the specification. The direction towards the positive direction of the Z-axis is the "top direction", the direction towards the negative direction of the Z-axis is the "bottom direction", the direction towards the negative direction of the X-axis is the "left direction", and the direction towards the positive direction of the X-axis is the "right direction", which does not limit the energy storage device 1000 in the actual application scenario.

[0034] The energy storage device 1000 includes a housing assembly 100, an external coating film 200, a cell 300 (the dotted line part shown in FIG. 1), a positive electrode terminal (not shown in FIG. 1), and a negative electrode terminal (not shown in FIG. 1). The external coating film 200 is attached to the housing assembly 100, and the cell 300 is installed inside the housing assembly 100. The cell 300 includes a positive electrode plate, a negative electrode plate, and a separator located between the positive electrode plate and the negative electrode plate. After the positive electrode plate, the separator, and the negative electrode plate are stacked in sequence, they are wound up to form the cell 300. Both the positive electrode terminal and the negative electrode terminal are attached to the housing assembly 100 and are electrically connected to the cell 300. Specifically, the positive electrode terminal is electrically connected to the positive electrode plate to realize the electrical connection between the positive electrode terminal and the cell 300, and the negative electrode terminal is electrically connected to the negative electrode plate to realize the electrical connection between the negative electrode terminal and the cell 300. So that the energy storage device 1000 is electrically connected to an external device, both the positive electrode terminal and the negative electrode terminal protrude from the housing assembly 100 in a direction away from the cell 300.

[0035] Referring to FIGS. 4 and 5, FIG. 4 is an exploded view showing the structure of the housing assembly 100 in the energy storage device 1000 shown in FIG. 2. FIG. 5 is a plan view showing the structure of the top cover 12 in the housing assembly 100 shown in FIG. 4.

[0036] The housing assembly 100 includes a housing 10 and a top patch 20 attached to the top side of the housing 10. The width direction of the housing 10 is the X-axis direction, the thickness direction of the housing 10 is the Y-axis direction, and the height direction of the housing 10 is the Z-axis direction.

[0037] Specifically, the housing 10 includes two side plates 11, a top cover 12, a bottom plate 13, and two face plates 14. The two side plates 11 are arranged opposite to each other along the X-axis direction. The top cover 12 and the bottom plate 13 are arranged opposite to each other along the Z-axis direction. The top cover 12 is fixedly connected to the top sides of the two side plates 11, and the bottom plate 13 is fixedly connected to the bottom sides of the two side plates 11. The two face plates 14 are arranged opposite to each other along the Y-axis direction and are fixedly connected between the two side plates 11 and between the top cover 12 and the bottom plate 13. The two side plates 11, the top cover 12, the bottom plate 13, and the two face plates 14 together enclose and form a storage chamber. The storage chamber can accommodate the cell 300. Exemplarily, the side plates 11, the bottom plate 13, and the two face plates 14 are all aluminum housings made of aluminum.

[0038] Specifically, the side plate 11 has a width D1 extending along the Y-axis direction, and the width D1 of the side plate 11 is the thickness of the housing 10. The top cover 12 is fixedly connected to the top sides of the two side plates 11 and the top sides of the two front plates 14. Exemplarily, the top cover 12 is a smooth aluminum sheet, and the top cover 12 can be fixedly connected to the top sides of the two side plates 11 and the top sides of the two front plates 14 by welding. The outer surface of the top cover 12 includes an edge region R121 and a mounting region R122, and the edge region R121 is provided so as to surround the mounting region R122. Note that the minimum width of the edge region R121 is K. The mounting region R122 is used for mounting other components. In this embodiment, the top cover 12 includes a top cover body 121 and two protrusions 122. The outer peripheral surface of the top cover body 121 is the outer peripheral surface of the top cover 12. The top cover body 121 is fixedly connected to the top sides of the two side plates 11 and the top sides of the two front plates 14, and the two protrusions 122 are both provided in the mounting region R122 and are spaced apart along the X-axis direction. Each protrusion 122 protrudes from the top cover body 121 in a direction away from the side plate 11 and protrudes from the top cover body 121. The minimum distance between the outer peripheral surface of the protrusion 122 and the outer peripheral surface of the top cover body 121 is the minimum width K of the edge region R121.

[0039] In this embodiment, the top cover 12 is provided with a pole hole 12a and a liquid injection hole 12b. There are two pole holes 12a, and both of the two pole holes 12a penetrate the top cover 12 along the thickness direction of the top cover 12 and communicate with the accommodation chamber. The two pole holes 12a are respectively used for mounting the positive pole and the negative pole. Specifically, the openings of the two pole holes 12a are respectively located on the two protrusions 122, and each pole hole 12a penetrates the top cover body 121 and the protrusion 122 along the Z-axis direction. The opening of the liquid injection hole 12b is located on the top cover body 121. The liquid injection hole 12b penetrates the top cover body 121 along the thickness direction of the top cover body 121 and communicates with the accommodation chamber, and is used for injecting electrolyte into the accommodation chamber.

[0040] In this embodiment, the outer peripheral surface of the top cover body 121 includes a first top cover outer peripheral surface 121a extending along the X-axis direction and a second top cover outer peripheral surface 121b extending along the Y-axis direction. The outer peripheral surface of each protrusion 122 includes a first protrusion outer peripheral surface 122a extending along the X-axis direction and a second protrusion outer peripheral surface 122b extending along the Y-axis direction. In this embodiment, the two protrusions 122 are mirror-symmetrical with respect to the central plane of the top cover body 121. Taking the protrusion 122 located on the left side as an example, the minimum distance between the first protrusion outer peripheral surface 122a of the protrusion 122 and the first top cover outer peripheral surface 121a of the top cover body 121 is K1, and the minimum distance between the second protrusion outer peripheral surface 122b of the protrusion 122 and the second top cover outer peripheral surface 121b of the top cover body 121 is K2. The minimum distance between the outer peripheral surface of the protrusion 122 and the outer peripheral surface of the top cover body 121, that is, the minimum width K of the edge region R121, is the minimum value of K1 and K2.

[0041] Referring to FIGS. 4 and 6, FIG. 6 is a plan view showing the structure of the top patch 20 in the housing assembly 100 shown in FIG. 4.

[0042] The top patch 20 is attached to the top side of the top cover 12 and covers the liquid injection hole 12b. Two hollow portions 21 are provided in the top patch 20, and the two hollow portions 21 are provided at intervals along the X-axis direction. Each hollow portion 21 penetrates the top patch 20 along the thickness direction of the top patch 20 and is used to allow the protrusion 122 to pass through.

[0043] In the present embodiment, the outer peripheral surface of the top patch 20 includes a first top patch outer peripheral surface 20a extending along the X-axis direction and a second top patch outer peripheral surface 20b extending along the Y-axis direction. The peripheral surface of each hollow portion 21 includes a first peripheral surface 21a extending along the X-axis direction and a second peripheral surface 21b extending along the Y-axis direction. The minimum distance between the first top patch outer peripheral surface 20a of the top patch 20 and the first peripheral surface 21a of the hollow portion 21 is J1, and the minimum distance between the second top patch outer peripheral surface 20b of the top patch 20 and the second peripheral surface 21b of the hollow portion 21 is J2. The minimum distance between the outer peripheral surface of the top patch 20 and the peripheral surface of the hollow portion 21 is J, and J is the minimum value of J1 and J2.

[0044] Referring to FIGS. 7 and 8, FIG. 7 is a schematic diagram showing the region division of the outer coating film 200 in the deployed state in the energy storage device 1000 shown in FIG. 2. FIG. 8 is a schematic diagram showing the structure of the outer coating film 200 in the deployed state shown in FIG. 7.

[0045] The outer coating film 200 includes a main body and an adhesive layer applied to the main body. The main body is an insulating layer for protecting the housing 10. The adhesive layer is applied to one surface of the main body. When the outer coating film 200 is attached to the housing assembly 100, the adhesive layer faces the housing 10, the main body 10 covers the outer surface of the housing 10, and the top patch 20 covers a part of the main body. Note that the "outer surface" of M means the surface of M that is away from the center of M.

[0046] Specifically, the outer coating film 200 includes two side film portions S1, a bottom film portion S2, a first surface film portion S31, a second surface film portion S32, and two top film portions S4. Along the X-axis direction, the two side film portions S1 are respectively located at opposite ends of the outer coating film 200. The bottom film portion S2 is connected between the two side film portions S1. Along the Y-axis direction, the first surface film portion S31 and the second surface film portion S32 are respectively located on opposite sides of the bottom film portion S2 and are connected between the two side film portions S1. One top film portion S4 is connected to one side of the two side film portions S1 facing the positive direction of the Y-axis and is connected to the first surface film portion S31. The other top film portion S4 is connected to the other side of the two side film portions S1 facing the negative direction of the Y-axis and is connected to the second surface film portion S32. Each side film portion S1 is used to cover the outer surface of one side plate 11, the bottom film portion S2 is used to cover the outer surface of the bottom plate 13, and the first surface film portion S31 and the second surface film portion S32 are respectively used to cover the outer surface of one face plate 14. Each top film portion S4 is used to cover the outer peripheral edge of the top surface of the top cover 12.

[0047] In each side film portion S1, the width of the side film portion S1 is L, that is, the distance between the outer edge and the inner edge of the side film portion S1 is L. In the present embodiment, each side film portion S1 includes a first portion S11, a second portion S12, and a third portion S13. Along the Y-axis direction, the third portion S13 is connected between the first portion S11 and the second portion S12. The third portions S13 of the two side film portions S1 are respectively connected to both opposite sides of the bottom film portion S2. The first portion S11 and the second portion S12 are alternately folded and used to cover the side plate 11. After the first portion S11 and the second portion S12 cover the side plate 11, the third portion S13 is used to cover the portion of the side plate 11 close to the bottom plate 13. The widths of the first portion S11, the second portion S12, and the third portion S13 are all L. Further, the ratio of L to the width D1 of the side plate 11 satisfies 1 / 2 < L / D1 < 1. Thereby, after the first portion S11 and the second portion S12 are alternately folded, a part of them overlaps, so that the side film portion S1 can completely cover the side plate 11. Also, since the sizes of the first portion S11 and the second portion S12 are too large, the first portion S11 and the second portion S12 respectively protrude from the edge of the side plate 11 and cover the side plate 11 in an overlapping manner, thereby avoiding the problem that wrinkles and bulges will occur after the first portion S11 and the second portion S12 overlap. Therefore, the consistency of the energy storage device 1000 is ensured.

[0048] A first cut groove 203a and a second cut groove 204a are provided in the side film portion S1 located on the right side of the bottom film portion S2, and a first cut groove 203b and a second cut groove 204b are provided in the side film portion S1 located on the left side of the bottom film portion S2. The first cut groove 203a and the first cut groove 203b are respectively located on both opposite sides of the bottom film portion S2. The second cut groove 204a and the second cut groove 204b are respectively located on both opposite sides of the bottom film portion S2. Further, the second cut groove 204a is located on one side of the first cut groove 203a away from the first surface film portion S31, and the second cut groove 204b is located on one side of the first cut groove 203b away from the first surface film portion S31. The first cut groove 203a and the first cut groove 203b may be the same or different. The second cut groove 204a and the second cut groove 204b may be the same or different. Hereinafter, the side film portion S1 located on the right side of the bottom film portion S2 will be described as an example.

[0049] In the side film portion S1, the first cut groove 203a and the second cut groove 204a are provided at intervals along the Y-axis direction. Both the first cut groove 203a and the second cut groove 204a penetrate the side film portion S1 along the thickness direction of the side film portion S1 and penetrate the outer edge of the side film portion S1. Specifically, the opening of the first cut groove 203a is located at the outer edge of the side film portion S1, and the bottom surface of the first cut groove 203a is provided at a distance from the inner edge of the side film portion S1. The opening of the second cut groove 204a is located at the outer edge of the side film portion S1 and is provided at a distance from the opening of the first cut groove 203a. The bottom surface of the second cut groove 204a is provided at a distance from the inner edge of the side film portion S1 and is provided at a distance from the bottom surface of the first cut groove 203a.

[0050] In this embodiment, the distance between the bottom surface of the second cut groove 204a and the inner edge of the side film portion S1 is the same as the distance between the bottom surface of the first cut groove 203a and the inner edge of the side film portion S1. That is, the length of the uncut portion from the bottom surface of the second cut groove 204a to the inner edge of the side film portion S1 is the same as the length of the uncut portion from the bottom surface of the first cut groove 203a to the inner edge of the side film portion S1. This is advantageous for forming the first cut groove 203a and the second cut groove 204a by cutting with the same cutting criterion.

[0051] In other embodiments, the distance between the bottom surface of the second cut groove 204a and the inner edge of the side film portion S1 may be different from the distance between the bottom surface of the first cut groove 203a and the inner edge of the side film portion S1.

[0052] In this embodiment, the extending direction of the first cut groove 203a and the extending direction of the second cut groove 204a are parallel, that is, the extending direction from the opening of the first cut groove 203a to the bottom surface of the first cut groove 203a and the extending direction from the opening of the second cut groove 204a to the bottom surface of the second cut groove 204a are parallel. Thereby, the cutting equipment does not need to adjust the angle, and only by translating the outer coating film 200, the first cut groove 203a and the second cut groove 204a can be quickly formed. The groove depth of the first cut groove 203a is Z1, that is, the depth extending from the opening of the first cut groove 203a to the bottom surface of the first cut groove 203a is Z1, and Z1 satisfies (2L - D2) < Z1 < L. Exemplarily, Z1 is 10 mm to 18 mm. In this embodiment, the groove depth Z1 of the first cut groove 203a is 12 mm. The groove depth of the second cut groove 204a is Z2, that is, the depth extending from the opening of the second cut groove 204a to the bottom surface of the second cut groove 204a is Z2, and Z2 satisfies (2L - D2) < Z2 < L. Exemplarily, Z2 is 10 mm to 18 mm. In this embodiment, the groove depth Z2 of the second cut groove 204a is 12 mm. In some embodiments, the depth extending from the opening of the first cut groove 203a to the bottom surface of the first cut groove 203a and the depth extending from the opening of the second cut groove 204a to the bottom surface of the second cut groove 204a are equal, both equal to Z, that is, Z1 = Z2 = Z, and Z satisfies (2L - D2) < Z < L. As shown in FIG. 9, FIG. 9 is a schematic diagram showing the structure of the outer coating film 200 in the unfolded state in another embodiment. In another embodiment, the extending direction from the opening of the first cut groove 203a to the bottom surface of the first cut groove 203a intersects but is not perpendicular to the outer edge of the side film portion S1, and the extending direction from the opening of the second cut groove 204a to the bottom surface of the second cut groove 204a intersects but is not perpendicular to the outer edge of the side film portion S1. Thereby, the third portion S13 presents a trapezoid with a small upper end and a large lower end. As a result, the attachment between the third portion S13 and the side plate becomes stronger and is less likely to break.

[0053] Each side film portion S1 is further provided with a first diagonal fold line 240 and a second diagonal fold line 250. The first diagonal fold line 240 is located on one side of the first cut groove 203a away from the second cut groove 204a, and is used to fold the first portion S11 along the first diagonal fold line 240. The first diagonal fold line 240 and the first cut groove 203a define the first portion S11 and the third portion S13. The first diagonal fold line 240 includes a first fixed end P1 and a first free end Q1. The first fixed end P1 is the intersection of the side film portion S1, the first surface film portion S31, and the bottom film portion S2. The first free end Q1 is provided to intersect the side surface of the first cut groove 203a away from the second cut groove 204a, that is, the first free end Q1 is located between the opening of the first cut groove 203a and the bottom surface of the first cut groove 203a. The distance between the first free end Q1 of the first diagonal fold line 240 and the bottom surface of the first cut groove 203a is H1, and H1 is greater than 0. In some embodiments, H1 is 0.1 mm to 5.5 mm. Thereby, the over-cut amount of the first cut groove 203a with respect to the first diagonal fold line 240 is ensured, and even if the first free end Q1 of the first diagonal fold line 240 is displaced toward the bottom surface of the first cut groove 203a with respect to the reference fold line, no wrinkles will occur. Also, when folding along the first diagonal fold line 240 so as to be attached to the side plate 11, air bubbles generated when the first portion S11 is folded to cover the third portion S13 can be extruded. Therefore, the firmness of the attachment of the outer coating film 200 can be further improved. Exemplarily, H1 is 1.5 mm.

[0054] The second slant fold line 250 is located on one side of the second cut groove 204a away from the first cut groove 203a, and both the second slant fold line 250 and the second cut groove 204a are connected between the second part S12 and the third part S13, and are used to fold the second part S12 along the second slant fold line 250. The second slant fold line 250 includes a second fixed end P2 and a second free end Q2. The second fixed end P2 is the intersection of the side film part S1, the second surface film part S32, and the bottom film part S2. The second free end Q2 is provided to intersect the side surface of the second cut groove 204a away from the first cut groove 203a, that is, the second free end Q2 is located between the opening of the second cut groove 204a and the bottom surface of the second cut groove 204a. The distance between the second free end Q2 of the second slant fold line 250 and the bottom surface of the second cut groove 204a is H2, and H2 is greater than 0. In some embodiments, H2 is 0.1 mm to 5.5 mm. Thereby, the overcut amount of the second cut groove 204a with respect to the second slant fold line 250 is ensured, and even if the second free end Q2 of the second slant fold line 250 is displaced toward the bottom surface of the second cut groove 204a with respect to the reference fold line, no wrinkles will occur. Also, when folding along the second slant fold line 250 so as to be attached to the side plate 11, bubbles generated when the second part S12 is folded to cover the third part S13 can be extruded. Therefore, the firmness of the attachment of the outer coating film 200 can be further improved. Exemplarily, H2 is 1.5 mm. In this embodiment, H2 = H1. In other embodiments, H2 and H1 may not be equal.

[0055] The bottom film part S2 is connected between the third parts S13 of the two side film parts S1, and the width of the bottom film part S2 is D2. The first surface film part S31 is connected between the first parts S11 of the two side film parts S1, and the second surface film part S32 is connected between the second parts S12 of the two side film parts S1. One of the two top film parts S4, the top film part S4, is connected to one side of the first part S11 of the two side film parts S1 away from the second part S12, and the other top film part S4 is connected to one side of the second part S12 of the two side film parts S1 away from the first part S11. In each top film part S4, the maximum width of the top film part S4 is G, that is, the maximum distance between the outer edge and the inner edge of the top film part S4 is G.

[0056] In this embodiment, the external coating film 200 is integrally formed and presents a rectangle. This is advantageous for cutting and forming the material of the external coating film 200, reducing the processing steps, and reducing costs. The external coating film 200 includes two first edges 201 and two second edges 202. The two first edges 201 are arranged opposite to each other along the X-axis direction, and the two first edges 201 are respectively the outer edges of the two side film parts S1. Each first edge 201 extends along the Y-axis direction. The two second edges 202 are arranged opposite to each other along the Y-axis direction, and the two second edges 202 are respectively the outer edges of the two top film parts S4. Each second edge 202 extends along the X-axis direction.

[0057] The outer coating film 200 is provided with two side edge folds 210, a first bottom edge fold 220a, a second bottom edge fold 220b, and two top edge folds 230. Two side film portions S1 are respectively defined by the two side edge folds 210, the two top edge folds 230, and the two first edges 201. A bottom film portion S2 is defined by the two side edge folds 210, the first bottom edge fold 220a, and the second bottom edge fold 220b. A first surface film portion S31 is defined by the two side edge folds 210, the first bottom edge fold 220a, and one top edge fold 230, and a second surface film portion S32 is defined by the two side edge folds 210, the second bottom edge fold 220b, and one top edge fold 230. Two top film portions S4 are respectively defined by the two top edge folds 230, the two first edges 201, and the two second edges 202.

[0058] Specifically, both of the two side edge folds 210 are located between the two first edges 201 and are provided at intervals along the X-axis direction. The two side edge folds 210 are respectively the inner edges of the two side film portions S1, and the distance between the side edge fold 210 and the first edge 201 is the width L of the side film portion S1. Each side film portion S1 may be bent with respect to the bottom film portion S2 along one side edge fold 210. In each side film portion S1, in the direction extending from the first fixed end P1 to the first free end Q1, the angle formed by the first diagonal fold 240 and the side edge fold 210 is θ1, and 15° ≤ θ1 ≤ 75°. In the direction extending from the second fixed end P2 to the second free end Q2, the angle formed by the second diagonal fold 250 and the side edge fold 210 is θ2, and 15° ≤ θ2 ≤ 75°. In this embodiment, both of the two side edge folds 210 extend along the Y-axis direction and extend from one second edge 202 to the other second edge 202. In each side film portion S1, the distance between the side edge fold 210 and the first free end Q1 of the first diagonal fold 240 is W1, the distance between the side edge fold 210 and the second free end Q2 of the second diagonal fold 250 is W2, and W1 and W2 are equal. The distance between the side edge fold 210 and the bottom surface of the first cut groove 203a is W3, the distance between the side edge fold 210 and the bottom surface of the second cut groove 204a is W4, and W3 and W4 are equal.

[0059] Both the first bottom edge fold 220a and the second bottom edge fold 220b are located between the two second edges 202 and are provided at intervals along the Y-axis direction. The first bottom edge fold 220a is connected between the bottom film portion S2 and the first surface film portion S31, and the second bottom edge fold 220b is connected between the bottom film portion S2 and the second surface film portion S32. The first surface film portion S31 can be bent with respect to the bottom film portion S2 along the first bottom edge fold 220a, and the second surface film portion S32 can be bent with respect to the bottom film portion S2 along the second bottom edge fold 220b. The distance between the first bottom edge fold 220a and the second bottom edge fold 220b is the width D2 of the bottom film portion S2, and D2 is approximately equal to the width D1 of the side plate 11.

[0060] In this embodiment, both the first bottom edge fold 220a and the second bottom edge fold 220b extend along the X-axis direction and extend from one first edge 201 to the other first edge 201. The intersection point where the first bottom edge fold 220a intersects with one side edge fold 210 is the first fixed end P1, and the intersection point where the second bottom edge fold 220b intersects with the other side edge fold 210 is the second fixed end P2.

[0061] Specifically, both of the two top edge folds 230 are located between the two second edges 202 and on both sides of the first bottom edge fold 220a and the second bottom edge fold 220b. Each of the two top edge folds 230 is located at opposite ends of the two side film portions S1 and is connected between the two side film portions S1 and the two top film portions S4. Each of the two top edge folds 230 is the inner edge of the two top film portions S4, and the distance between the top edge fold 230 and the second edge 202 is the maximum width G of the top film portion S4. In this embodiment, both of the two top edge folds 230 extend along the X-axis direction and extend from one first edge 201 to the other first edge 201.

[0062] Referring to FIG. 10, FIG. 10 is a partial enlarged view of part A in the outer coating film 200 shown in FIG. 8.

[0063] Note that the first diagonal fold line 240 and the second diagonal fold line 250 are usually formed by a folding device. Before forming the first diagonal fold line 240 and the second diagonal fold line 250, a reference fold line 260 is usually preset on the outer coating film 200 in advance. When actually forming the fold line, the first free end Q1 of the actual fold line of the first diagonal fold line 240 and the second diagonal fold line 250 may shift to both sides of the reference fold line 260. For example, in the present embodiment, the first free end Q1 of the first diagonal fold line 240 (actual fold line) shifts towards the bottom surface of the first cut groove 203a with respect to the reference fold line 260. That is, the actual fold line of the first diagonal fold line 240 may be folded too much compared to the reference fold line 260. In other embodiments, the first free end of the actually formed first diagonal fold line 270a may also shift towards the opening of the first cut groove 203a with respect to the reference fold line 260. That is, the actual fold line of the first diagonal fold line 270a may be folded less compared to the reference fold line 260. The distance between the first free end Q1 of the first diagonal fold line 240 and the bottom surface of the first cut groove 203a is set as H1, that is, the distance H1 by which the bottom surface of the first cut groove 203a protrudes from the first free end Q1 of the first diagonal fold line 240 is set to be greater than 0. Thereby, when the folding device forms the first diagonal fold line 240, even if the first free end Q1 of the actual fold line of the first diagonal fold line 240 shifts to either side of the reference fold line 260, neither of the first free ends Q1 of the first diagonal fold line 240 protrudes from the bottom surface of the first cut groove 203a. That is, it is ensured that the first free end Q1 of the first diagonal fold line 240 is located between the opening and the bottom surface of the first cut groove 203a. Therefore, it is ensured that the first portion S11 in the side film portion S1 does not wrinkle and can always be firmly attached to the side plate 11.

[0064] In this embodiment, the second free end Q2 of the second oblique fold line 250 (actual fold line) is displaced toward the bottom surface of the second cut groove 204a with respect to the reference fold line 260. That is, the actual fold line of the second oblique fold line 250 may be over-folded compared to the reference fold line 260. In other embodiments, the second free end of the actually formed second oblique fold line 270b may be displaced toward the opening of the second cut groove 204a with respect to the reference fold line 260. That is, the actual fold line of the second oblique fold line 270b may be less folded compared to the reference fold line 260. The distance between the second free end Q2 of the second oblique fold line 250 and the bottom surface of the second cut groove 204a is set as H2, that is, the distance H2 by which the bottom surface of the second cut groove 204a protrudes from the second free end Q2 of the second oblique fold line 250 is set to be greater than 0. Thereby, when the folding device forms the second oblique fold line 250, even if the second free end Q2 of the actual fold line of the second oblique fold line 250 is displaced to either side of the reference fold line 260, neither of the second free ends Q2 of the second oblique fold line 250 protrudes from the bottom surface of the second cut groove 204a, that is, it is ensured that the second free end Q2 of the second oblique fold line 250 is positioned between the opening and the bottom surface of the second cut groove 204a. Therefore, it is ensured that the second portion S12 in the side film portion S1 does not wrinkle and can always be firmly attached to the side plate 11.

[0065] Also, even if H2 and H1 are not equal, that is, even if the displacement of the second free end Q2 of the second oblique fold line 250 and the displacement of the first free end Q1 of the first oblique fold line 240 with respect to the reference fold line 260 are different, when the first portion S11 and the second portion S12 are alternately folded to cover the side plate 11, it is possible to prevent wrinkles from occurring, avoiding the problem that the side plate 11 bulges where it is covered by the wrinkles, which is advantageous for improving the consistency of the energy storage device 1000 and further for improving the lifespan of the power consumption device 1. Different displacements mean that the directions of displacement are different and / or the amounts of displacement are different.

[0066] In the external coating film 200 according to the present application, the side film portion S1 can be folded along the first slanting fold line 240 and the second slanting fold line 250 so as to be coated on the side plate 11 of the energy storage device 1000. When actually forming the actual fold lines of the first slanting fold line 240 and the second slanting fold line 250, usually, a reference fold line is set in advance. During actual formation, since the first free end Q1 of the first slanting fold line 240 and the second free end Q2 of the second slanting fold line 250 usually deviate from the reference fold line 260 and the degree of deviation from the reference fold line 260 may be different, there is a problem that displacement is likely to occur when the side film portion S1 is coated. In the present application, a first cut groove 203a is provided in the side film portion S1, and the distance by which the bottom surface of the first cut groove 203a protrudes from the first free end Q1 of the first slanting fold line 240 is set to be greater than 0. Thereby, when forming the first slanting fold line 240, even if the first free end Q1 of the actual fold line of the first slanting fold line 240 deviates to either side of the reference fold line 260, it is ensured that the first free end Q1 of the first slanting fold line 240 does not protrude from the bottom surface of the first cut groove 203a, that is, it is ensured that the first cut groove 203a is not cut too much with respect to the first slanting fold line 240. Therefore, the first portion S11 in the side film portion S1 (that is, the region of the side film portion S1 located on one side of the first cut groove 203a away from the second cut groove 204a) can be firmly attached to the side plate 11, and it is ensured that no wrinkles occur. Therefore, it is ensured that displacement is less likely to occur when the first portion S11 covers the side plate 11. Further, a second cut groove 204a is provided in the side film portion S1, and the distance by which the bottom surface of the second cut groove 204a protrudes from the second free end Q2 of the second slanting fold line 250 is set to be greater than 0. Thereby, when forming the second slanting fold line 250, even if the second free end Q2 of the actual fold line of the second slanting fold line 250 deviates to either side of the reference fold line 260, it is ensured that the second free end Q2 of the second slanting fold line 250 does not protrude from the bottom surface of the second cut groove 204a, that is, it is ensured that the second cut groove 204a is not cut too much with respect to the second slanting fold line 250.Therefore, the second portion S12 in the side film portion S1 (i.e., the region of the side film portion S1 located on one side of the second cut groove 204a away from the first cut groove 203a) can be firmly attached to the side plate 11, ensuring that no wrinkles occur. Thus, it is ensured that when the second portion S12 covers the side plate 11, displacement is less likely to occur.

[0067] In addition, even if the displacements of the first diagonal fold 240 and the second diagonal fold 250 relative to the reference fold 260 are different, it is ensured that no wrinkles occur when the side film portion S1 covers, avoiding the problem of swelling when the side plate 11 is covered, and ensuring that displacement is less likely to occur when the side film portion S1 covers the side plate 11. Thereby, the consistency of the energy storage device 1000 is ensured, and furthermore, it is advantageous for improving the lifespan of the power consumption device 1.

[0068] Also, in the external coating film 200, even without folding the bottom film portion S2, it is possible to completely cover the outer surface of the bottom plate 13 with the bottom film portion S2. Thereby, the problem of wrinkles caused by folding and covering when covering the bottom plate 13 is avoided, and furthermore, the consistency of the energy storage device 1000 is further ensured.

[0069] Referring to FIGS. 11 and 12, FIG. 11 is a structural diagram showing the assembly of the housing 10 and the external coating film 200 in the energy storage device 1000 shown in FIG. 2. FIG. 12 is a structural diagram showing the formation of the energy storage device 1000 by assembling the assembled structure shown in FIG. 11 and the top patch 20.

[0070] When assembling the energy storage device 1000, the bottom plate 13 of the housing 10 is placed on the bottom film portion S2 of the external coating film 200. The adhesive layer of the external coating film 200 faces the housing 10. The two edges of the bottom plate 13 extending along the X-axis direction are respectively placed corresponding to the first bottom edge fold line 220a (see FIG. 7) and the second bottom edge fold line 220b. The two edges of the bottom plate 13 extending along the Y-axis direction are placed corresponding to the two side edge fold lines 210. Thereby, it is realized that the bottom film portion S2 is attached to the bottom plate 13 to cover the bottom plate 13. Even if the bottom film portion S2 is not folded, it is possible to completely cover the outer surface of the bottom plate 13 with the bottom film portion S2 of the external coating film 200. Thereby, the problem of wrinkles caused by folding and covering when covering the bottom plate 13 is avoided. The first surface film portion S31 and the second surface film portion S32 are respectively attached to the two face plates 14 to cover the two face plates 14. Along each of the first bottom edge fold line 220a and the second bottom edge fold line 220b (see FIG. 7), the external coating film 200 is bent toward the housing 10 of the energy storage device. At this time, the outer peripheral surface of the top of the face plate 14 is placed corresponding to the top edge fold line 230, that is, the outer peripheral surface of the top cover 12 is placed corresponding to the top edge fold line 230.

[0071] The first portion S11 in the side film portion S1 is folded along the first diagonal fold line 240, a part of the first portion S11 is attached to the outer surface of the side plate 11, and a part of the first portion S11 is attached to the third portion S13. The second portion S12 in the side film portion S1 is folded along the second diagonal fold line 250, and a part of the second portion S12 is attached to the outer surface of the side plate 11 and the surface of the first portion S11 away from the side plate 11. A part of the second portion S12 is attached to the third portion S13, and is also attached to the surface of the first portion S11 attached to the third portion S13 and away from the third portion S13. The third portion S13 is rotated in the direction from the bottom side to the top side around the Y axis and attached to the surface of the second portion S12 away from the side plate 11 and the surface of the first portion S11 away from the side plate 11. Thereby, it is realized that the side film portion S1 is attached to the side plate 11 to cover the side plate 11. At this time, the third portion S13 covers the portion of the side plate 11 close to the bottom side. Also, as shown in FIG. 10, the distance H1 between the first free end Q1 of the first diagonal fold line 240 and the bottom surface of the first cut groove 203a is equal to the distance H2 between the second free end Q2 of the second diagonal fold line 250 and the bottom surface of the second cut groove 204a. Further, since the direction in which the third portion S13 is attached to the side plate 11 is from the bottom side to the top side, when the housing 10 is inserted into the groove with a clearance fit in the direction from the top side and the energy storage device 1000 is mounted with the module, the third portion S13 can be pressed in the forward direction and will not warp.

[0072] As shown in FIG. 13, FIG. 13 is a partial structural diagram showing that the side film portion S1 in some other embodiments is attached to the outer surface of the side plate 11. In other embodiments, the distance between the first free end Q1 of the first slant fold 240 and the bottom surface of the first cut groove 203a is different from the distance between the second free end Q2 of the second slant fold 250 and the bottom surface of the second cut groove 204a. The first free end Q1 of the first slant fold 240 and the second free end Q2 of the second slant fold 250 have a step along the Z-axis direction. After folding along the first slant fold 240 and the second slant fold 250, the distance between the first free end Q1 of the first slant fold 240 and the bottom plate 13 is different from the distance between the second free end Q2 of the second slant fold 250 and the bottom plate 13.

[0073] Continuing to refer to FIGS. 11 and 12, the top film portion S4 is bent toward the top cover 12 along the two top edge folds 230, and the adhesive layer of the top film portion S4 is attached to the outer surface of the top cover body 121 away from the side plate 11, thereby realizing that the top film portion S4 is attached to the edge region of the outer surface of the top cover 12. The maximum width G of the top film portion S4 and the minimum width K in the edge region of the top cover 12 (i.e., the minimum distance K between the outer peripheral surface of the protrusion 122 and the outer peripheral surface of the top cover 12) satisfy G≦K. Thereby, the top film portion S4 covers a part of the edge region and the attachment region is exposed, and interference with the components in the attachment region can be avoided, that is, the top film portion S4 covers a part of the top cover body 121 and the protrusion 122 is exposed, and interference with the protrusion 122 is avoided.

[0074] The top patch 20 is attached to the surface of the top cover 12 away from the side plate 11 along the negative direction of the Z-axis (the direction of the arrow in FIG. 12), and the top patch 20 completely covers the surface of the top film portion S4. Specifically, the top patch 20 is attached to the surface of the top cover body 121 away from the side plate 11. The minimum distance J between the outer peripheral surface of the top patch 20 and the outer peripheral surface of the hole inner wall of the hollow portion 21, and the maximum width G of the top film portion S4 satisfy G < J. Thereby, the top patch 20 can completely cover the top film portion S4, the top film portion S4 is not exposed from the hollow portion 21 of the top patch 20, and warping of the top film portion S4 during subsequent processes is avoided. In the present embodiment, the minimum distance J between the outer peripheral surface of the top patch 20 and the outer peripheral surface of the hole inner wall of the hollow portion 21, the maximum width G of the top film portion S4, and the minimum distance K between the outer peripheral surface of the protrusion 122 and the outer peripheral surface of the top cover body 121 further satisfy G < J < K. Thereby, after attaching the top patch 20, it is avoided that the outer peripheral surface of the top patch 20 protrudes from the outer peripheral surface of the top cover body 121 and peeling occurs, and the two hollow portions 21 sleeve the outer peripheral surface of the protrusion 122 so that the protrusion 122 is exposed. Further, in the present embodiment, G, J, and K further satisfy (K - J) < (J - G). Thereby, the top patch 20 can not only completely cover the top film portion S4, but also be attached to a part of the top surface of the top cover to further crimp the top film portion S4, and warping of the top film portion S4 is avoided.

[0075] What is disclosed above is only a preferred embodiment of the present application and is not used to limit the scope of the claims of the present application. Those skilled in the art can understand the whole or part of the process of realizing the above embodiment, and equivalent changes made based on the scope of the claims of the present application still belong to the scope covered by the present application.

Description of Reference Numerals

[0076] 1... Power consumption device, 1000... Energy storage device, 100... Housing assembly, 10... Housing, 11... Side plate, 12... Top cover, 12a... Terminal hole, 12b... Liquid injection hole, R121... Edge region, R122... Mounting region, 121... Top cover body, 121a... First top cover outer peripheral surface, 121b... Second top cover outer peripheral surface, 122... Protrusion, 122a... First protrusion outer peripheral surface, 122b... Second protrusion outer peripheral surface, 13... Bottom plate, 14... Front panel, 20... Top patch, 20a... First top patch outer peripheral surface, 20b... Second top patch outer peripheral surface, 21... Hollow part, 21a... First peripheral surface, 21b... Second peripheral surface, 200... Outer coating film, 201... First edge, 202... Second edge, 203a, 203b... First cut groove, 204a, 204b... Second cut groove, 210... Side edge fold line, 220a... First bottom edge fold line, 220b... Second bottom edge fold line, 230... Top edge fold line, 240, 270a... First diagonal fold line, P1... First fixed end, Q1... First free end, 250, 270b... Second diagonal fold line, P2... Second fixed end, Q2... Second free end, 260... Reference fold line, S1... Side film part, S11... First part, S12... Second part, S13... Third part, S2... Bottom film part, S31... First front film part, S32... Second front film part, S4... Top film part, 300... Cell.

Claims

1. An energy storage device (1000) comprising an outer coating film (200) and a housing (10), wherein the outer coating film (200) includes a main body and an adhesive layer applied to the main body, The housing (10) includes a bottom plate (13), two facing front plates (14), and two facing side plates (11). The bottom plate (13) is fixedly connected to the bottom sides of the two side plates (11). The two front plates (14) are respectively fixedly connected between the two side plates (11) and are fixedly connected to the bottom plate (13). The outer coating film (200) includes two side film portions (S1), a bottom film portion (S2), a first front film portion (S31), and a second front film portion (S32). The two side film portions (S1) are respectively located at opposite ends of the outer coating film (200) and respectively cover the outer surfaces of the two side plates (11). The bottom film portion (S2) is connected between the two side film portions (S1) and covers the outer surface of the bottom plate (13). The first front film portion (S31) and the second front film portion (S32) are located on opposite sides of the bottom film portion (S2), are respectively connected between the two side film portions (S1), and respectively cover the outer surfaces of the two front plates (14). Each of the side film portions (S1) is provided with a first cut groove (203a, 203b) and a second cut groove (204a, 204b) provided at an interval from the first cut groove (203a, 203b). The first cut groove (203a, 203b) and the second cut groove (204a, 204b) both penetrate the side film portion (S1) along the thickness direction of the side film portion (S1) and penetrate the outer edge of the side film portion (S1). The bottom surfaces of the first cut groove (203a, 203b) and the second cut groove (204a, 204b) are both provided at an interval from the inner edge of the side film portion (S1). The first cut grooves (203a, 203b) of the two side film portions (S1) are respectively located on opposite sides of the bottom film portion (S2). The second cut grooves (204a, 204b) of the two side film portions (S1) are respectively located on opposite sides of the bottom film portion (S2) and are located on one side of the first cut groove (203a, 203b) away from the first front film portion (S31). Each of the side film portions (S1) is provided with a first diagonal fold line (240, 270a) and a second diagonal fold line (250, 270b). The first diagonal fold line (240, 270a) is located on one side of the first cut groove (203a, 203b) away from the second cut groove (204a, 204b). The first diagonal fold line (240, 270a) includes a first fixed end (P1) and a first free end (Q1). The first fixed end (P1) is the intersection of the side film portion (S1), the first surface film portion (S31), and the bottom film portion (S2). The first free end (Q1) is provided intersecting the side surface of the first cut groove (203a, 203b), and the distance between the first free end (Q1) and the bottom surface of the first cut groove (203a, 203b) is greater than 0. The second diagonal fold line (250, 270b) is located on one side of the second cut groove (204a, 204b) away from the first cut groove (203a, 203b). The second diagonal fold line (250, 270b) includes a second fixed end (P2) and a second free end (Q2). The second fixed end (P2) is the intersection of the side film portion (S1), the second surface film portion (S32), and the bottom film portion (S2). The second free end (Q2) is provided intersecting the side surface of the second cut groove (204a, 204b), and the distance between the second free end (Q2) and the bottom surface of the second cut groove (204a, 204b) is greater than 0. Energy storage device (1000), characterized in that.

2. In each of the side film portions (S1), the distance between the first free end (Q1) and the bottom surface of the first cut groove (203a, 203b) is H1, and 0.1 mm ≤ H1 ≤ 5.5 mm. The distance between the second free end (Q2) and the bottom surface of the second cut groove (204a, 204b) is H2, and 0.1 mm ≤ H2 ≤ 5.5 mm. Energy storage device (1000) according to claim 1, characterized in that.

3. In each of the side film portions (S1), in the direction extending from the first fixed end (P1) towards the first free end (Q1), the angle formed by the first diagonal fold line (240, 270a) and the inner edge of the side film portion (S1) is θ1, and 15° ≤ θ1 ≤ 75°. In the direction extending from the second fixed end (P2) toward the second free end (Q2), the angle formed by the second fold line (250, 270b) and the inner edge of the side film portion (S1) is θ2, and 15° ≤ θ2 ≤ 75°. The energy storage device (1000) according to claim 1, characterized in that.

4. In each of the side film portions (S1), the distance between the first free end (Q1) and the inner edge of the side film portion (S1) is W1, the distance between the second free end (Q2) and the inner edge of the side film portion (S1) is W2, and W1 and W2 are equal. The energy storage device (1000) according to claim 1, characterized in that.

5. In each of the side film portions (S1), the distance between the bottom surface of the first cut groove (203a, 203b) and the inner edge of the side film portion (S1) is W3, the distance between the bottom surface of the second cut groove (204a, 204b) and the inner edge of the side film portion (S1) is W4, and W3 and W4 are equal. The energy storage device (1000) according to claim 1, characterized in that.

6. The depth extending from the opening of the first cut groove (203a, 203b) toward the bottom surface of the first cut groove (203a, 203b) is Z1, and 10 mm ≤ Z1 ≤ 18 mm. The depth extending from the opening of the second cut groove (204a, 204b) toward the bottom surface of the second cut groove (204a, 204b) is Z2, and 10 mm ≤ Z2 ≤ 18 mm. The energy storage device (1000) according to claim 5, characterized in that.

7. The extending direction from the opening of the first cut groove (203a, 203b) to the bottom surface of the first cut groove (203a, 203b) and the extending direction from the opening of the second cut groove (204a, 204b) to the bottom surface of the second cut groove (204a, 204b) are parallel. The energy storage device (1000) according to claim 1, characterized in that.

8. The extending direction from the opening of the first cut groove (203a, 203b) to the bottom surface of the first cut groove (203a, 203b) intersects the outer edge of the side film portion (S1) and is not perpendicular. The extending direction from the opening of the second cut groove (204a, 204b) to the bottom surface of the second cut groove (204a, 204b) intersects the outer edge of the side film portion (S1) and is not perpendicular. The energy storage device (1000) according to claim 1, characterized in that...

9. In each of the side film portions (S1), the distance between the outer edge and the inner edge of the side film portion (S1) is L, the side plate (11) has a width D1 extending along the thickness direction of the housing (10), and 1 / 2 < L / D1 < 1. The energy storage device (1000) according to claim 1, characterized in that...

10. Each of the side film portions (S1) includes a first portion (S11), a second portion (S12), and a third portion (S13). The third portion (S13) is connected between the first portion (S11) and the second portion (S12). The first portion (S11) and the third portion (S13) are defined by the first folding line (240, 270a) and the first cut groove (203a, 203b), and the second portion (S12) and the third portion (S13) are defined by the second folding line (250, 270b) and the second cut groove (204a, 204b). The third portions (S13) of the two side film portions (S1) are respectively connected to both opposite sides of the bottom film portion (S2). The energy storage device (1000) according to claim 1, characterized in that...

11. The housing (10) further includes a top cover (12). The top cover (12) is provided opposite to the bottom plate (13) and is fixedly connected to the top sides of the two side plates (11) and the top sides of the two face plates (14). The external coating film (200) further includes two top film portions (S4). One of the top film portions (S4) is fixedly connected to one side of the two side film portions (S1) and is connected to the first face film portion (S31). The other top film portion (S4) is fixedly connected to the other side of the two side film portions (S1) and is connected to the second face film portion (S32). The two top film portions (S4) cover the outer peripheral edge of the top surface of the top cover (12). The energy storage device (1000) according to claim 1, characterized in that...

12. The top surface of the top cover (12) includes an attachment region (R122) and an edge region (R121) surrounding the attachment region (R122). The two top film portions (S4) cover at least a part of the edge region (R121). The minimum width of the edge region (R121) is K, the maximum width of the top film portion (S4) is G, and G ≤ K. The energy storage device (1000) according to claim 11, characterized in that.

13. The energy storage device (1000) further includes a top patch (20). The top patch (20) is attached to the top surface of the top cover (12) away from the side plate (11) and covers the top film portion (S4). A hollow portion (21) is provided in the top patch (20). The hollow portion (21) penetrates the top patch (20) along the thickness direction of the top patch (20). The minimum distance between the outer peripheral surface of the top patch (20) and the peripheral surface of the hollow portion (21) is J, and G < J. The energy storage device (1000) according to claim 12, characterized in that.

14. G < J < K. The energy storage device (1000) according to claim 13, characterized in that.

15. (K - J) < (J - G). The energy storage device (1000) according to claim 13, characterized in that.

16. In each of the side film portions (S1), the distance between the outer edge and the inner edge of the side film portion (S1) is L. The depth extending from the opening of the first cut groove (203a, 203b) toward the bottom surface of the first cut groove (203a, 203b) is Z1. The width of the bottom film portion (S2) is D2, and (2L - D2) < Z1 < L. The energy storage device (1000) according to claim 1, characterized in that.

17. In each of the side film portions (S1), the distance between the outer edge and the inner edge of the side film portion (S1) is L. The depth extending from the opening of the second cut groove (204a, 204b) toward the bottom surface of the second cut groove (204a, 204b) is Z2. The width of the bottom film portion (S2) is D2, and (2L - D2) < Z2 < L. The energy storage device (1000) according to claim 1, characterized in that.

18. A power consumption device comprising the energy storage device (1000) according to any one of claims 1 to 17, wherein the energy storage device supplies power to the power consumption device. A power consumption device characterized by the above.

19. An external coating film (200) for attaching the housing (10) of the energy storage device (1000), the external coating film (200) including a main body and an adhesive layer applied to the main body. The housing (10) includes a bottom plate (13), two facing front plates (14), and two facing side plates (11). The bottom plate (13) is fixedly connected to the bottom sides of the two side plates (11). The two front plates (14) are respectively fixedly connected between the two side plates (11) and are also fixedly connected to the bottom plate (13). The external coating film (200) includes two side film portions (S1), a bottom film portion (S2), a first front film portion (S31), and a second front film portion (S32). The two side film portions (S1) are respectively located at opposite ends of the external coating film (200) and are used to respectively cover the outer surfaces of the two side plates (11). The bottom film portion (S2) is connected between the two side film portions (S1) and is used to cover the outer surface of the bottom plate (13). The first front film portion (S31) and the second front film portion (S32) are located on opposite sides of the bottom film portion (S2), are respectively connected between the two side film portions (S1), and are used to respectively cover the outer surfaces of the two front plates (14). In each of the side film portions (S1), a first cut groove (203a, 203b) and a second cut groove (204a, 204b) provided at an interval from the first cut groove (203a, 203b) are provided. Both the first cut groove (203a, 203b) and the second cut groove (204a, 204b) penetrate the side film portion (S1) along the thickness direction of the side film portion (S1) and penetrate the outer edge of the side film portion (S1). The bottom surfaces of the first cut groove (203a, 203b) and the second cut groove (204a, 204b) are both provided at an interval from the inner edge of the side film portion (S1). The first cut grooves (203a, 203b) of the two side film portions (S1) are respectively located on both opposite sides of the bottom film portion (S2), and the second cut grooves (204a, 204b) of the two side film portions (S1) are respectively located on both opposite sides of the bottom film portion (S2), and are located on one side of the first cut groove (203a, 203b) away from the first surface film portion (S31). The depth extending from the opening of the first cut groove (203a, 203b) toward the bottom surface of the first cut groove (203a, 203b) is Z, and the depth extending from the opening of the second cut groove (204a, 204b) toward the bottom surface of the second cut groove (204a, 204b) is Z. In each of the side film portions (S1), the distance between the outer edge and the inner edge of the side film portion (S1) is L, the width of the bottom film portion (S2) is D2, and (2L - D2) < Z < L. In each of the side film portions (S1), a first diagonal fold (240, 270a) and a second diagonal fold (250, 270b) are provided. The first diagonal fold (240, 270a) is located on one side of the first cut groove (203a, 203b) away from the second cut groove (204a, 204b). The first diagonal fold (240, 270a) includes a first fixed end (P1) and a first free end (Q1). The first fixed end (P1) is the intersection of the side film portion (S1), the first surface film portion (S31), and the bottom film portion (S2). The first free end (Q1) is provided to intersect the side surface of the first cut groove (203a, 203b), and the distance between the first free end (Q1) and the bottom surface of the first cut groove (203a, 203b) is greater than 0. The second slant fold lines (250, 270b) are located on one side of the second cut grooves (204a, 204b) away from the first cut grooves (203a, 203b). The second slant fold lines (250, 270b) include a second fixed end (P2) and a second free end (Q2). The second fixed end (P2) is an intersection point of the side film portion (S1), the second surface film portion (S32), and the bottom film portion (S2). The second free end (Q2) is provided to intersect the side surface of the second cut groove (204a, 204b). The distance between the second free end (Q2) and the bottom surface of the second cut groove (204a, 204b) is greater than 0. The outer coating film (200) is characterized by the above.

Images