Soft pack batteries and electrical equipment

Abstract

The present invention discloses a soft-pack battery and an electrical device, wherein the soft-pack battery includes a soft-pack shell and a battery cell. The soft-pack shell is formed by processing a soft packaging film, which includes an insulating layer, a metal foil layer, and a melt adhesive layer bonded sequentially along its thickness. The soft-pack shell includes a packaging body and multiple edge sealing structures. The packaging body has a receiving cavity. The battery cell includes a battery body and a tab. The battery body is located in the receiving cavity, and the tab extends from the soft-pack shell. The edge sealing structure includes a first insulating layer, a metal sealing layer, and a second insulating layer bonded sequentially along its thickness. The insulating layer includes a first insulating layer and a second insulating layer. The metal foil layer forms a metal sealing layer. The thickness of the metal sealing layer is less than or equal to the thickness of the two metal foil layers. The edge sealing structure of this embodiment eliminates the melt adhesive layer and is thinner. This can not only reduce the volume of the soft-pack battery, but also reduce the weight of the soft-pack battery, thereby improving the energy density of the soft-pack battery.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a soft-pack battery and an electrical device. Background Art

[0002] In the existing soft-pack battery manufacturing technology, the packaging process usually uses a heat-sealing head to fuse the PP layers in the two layers of aluminum-plastic film together to form a sealing edge structure. In order to maintain sufficient packaging strength and sealing of the sealing edge structure, the PP layer needs to have a certain thickness and width, which increases the size of the sealing edge structure, thereby increasing the volume of the soft-pack battery and reducing the energy density of the soft-pack battery. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a soft-pack battery having a smaller edge sealing structure, thereby enabling the soft-pack battery to have a higher energy density.

[0004] The present invention also provides an electrical device having the soft-pack battery.

[0005] A soft-pack battery according to an embodiment of the first aspect of the present invention includes a soft-pack casing and a battery cell.

[0006] The soft-pack shell is formed by processing a packaging soft film, which includes an insulating layer, a metal foil layer and a melt-adhesive layer bonded in sequence along its own thickness direction. The soft-pack shell includes a packaging body and multiple edge-sealing structures. The packaging body has a accommodating cavity. The packaging body includes two first walls arranged opposite to each other along the thickness direction of the soft-pack battery, and a second wall located between the two first walls and arranged around them. Each of the edge-sealing structures is connected to the second wall. The edge-sealing structure includes a first insulating layer, a metal sealing layer and a second insulating layer bonded in sequence along its own thickness direction. The first insulating layer and the second insulating layer are located at the outermost layers of the edge-sealing structure. The thickness of the first insulating layer and the second insulating layer is not greater than the thickness of the insulating layer. The metal foil layer forms the metal sealing layer, and the thickness of the metal sealing layer is less than or equal to the thickness of the two layers of the metal foil layers. The battery cell includes a battery cell body and a tab. The battery cell body is located in the accommodating cavity. The tab is connected to the battery cell body and extends out of the soft-pack shell.

[0007] The soft-pack battery according to the embodiment of the present invention has at least the following beneficial effects:

[0008] In this embodiment, the edge-sealing structure includes a first insulating layer, a metal sealing layer, and a second insulating layer bonded sequentially along its thickness. The first and second insulating layers are located at the outermost layers of the edge-sealing structure, and the metal foil layer forms the metal sealing layer. As can be seen, compared to conventional edge-sealing structures, the edge-sealing structure of this embodiment at least removes the original adhesive layer of the encapsulating soft film. Therefore, the thickness of the edge-sealing structure of this embodiment is smaller than that of conventional edge-sealing structures, which not only reduces the volume but also the weight of the soft-pack battery, thereby increasing the energy density of the soft-pack battery.

[0009] According to some embodiments of the present invention, the thickness of the metal sealing layer is less than or equal to the thickness of two layers of the metal foil layers.

[0010] According to some embodiments of the present invention, the edge sealing structure includes a first edge sealing portion and a second edge sealing portion distributed along its own thickness direction, the first edge sealing portion includes the first insulating layer and the first metal foil layer bonded in sequence along its own thickness direction, the second edge sealing portion includes the second insulating layer and the second metal foil layer bonded in sequence along its own thickness direction, the metal foil layer includes the first metal foil layer and the second metal foil layer, and the first metal foil layer and the second metal foil layer are welded to each other to form the metal sealing layer.

[0011] According to some embodiments of the present invention, the first insulating layer includes a first sub-insulating layer and a second sub-insulating layer, the first sub-insulating layer is composed of a portion of the insulating layer, the first sub-insulating layer has a first window, the first window is used for laser irradiation of the first metal foil layer so that the first metal foil layer and the second metal foil layer are welded, and the second sub-insulating layer is filled in the first window.

[0012] According to some embodiments of the present invention, the edge sealing structure is a rectangular structure, having a first edge and a second edge arranged opposite to each other in its own length direction, and a third edge arranged opposite to the packaging body in its own width direction, and the shape of the first window is rectangular, and the first window extends to the first edge, the second edge and the third edge.

[0013] According to some embodiments of the present invention, the thickness of the second sub-insulating layer is smaller than the thickness of the insulating layer.

[0014] According to some embodiments of the present invention, the second insulating layer includes a third sub-insulating layer and a fourth sub-insulating layer, the third sub-insulating layer is composed of part of the insulating layer, the third sub-insulating layer has a second window at a position corresponding to the first window, and the fourth sub-insulating layer is filled in the second window.

[0015] According to some embodiments of the present invention, the first insulating layer and the second insulating layer are both formed by portions of the insulating layer.

[0016] According to some embodiments of the present invention, the edge sealing structure includes a first edge sealing portion and a second edge sealing portion distributed along its own thickness direction, the first edge sealing portion includes the first insulating layer, the second edge sealing portion includes the second insulating layer and a second metal foil layer bonded in sequence along its own thickness direction, the metal foil layer includes the second metal foil layer, the first insulating layer is bonded to the second metal foil layer, and the second metal foil layer constitutes the metal sealing layer.

[0017] According to some embodiments of the present invention, the multiple edge sealing structures include a first edge sealing structure, which is folded toward the packaging body. The first edge sealing structure has a first groove on the side facing the packaging body, and the metal sealing layer is exposed from the first groove. The insulation layer of the packaging body corresponding to the first groove has a second groove, and the metal foil layer inside the packaging body is exposed from the second groove. The metal sealing layer is welded to the metal foil layer of the packaging body exposed from the second groove.

[0018] According to some embodiments of the present invention, the multiple edge sealing structures include a first edge sealing structure, which is folded toward the packaging body, and the first insulating layer of the first edge sealing structure has a first window, which is used for laser irradiation of the first metal foil layer so that the first metal foil layer and the second metal foil layer are welded to form the metal sealing layer; the insulating layer of the packaging body corresponding to the first window has a second groove, and the metal foil layer inside the packaging body is exposed from the second groove; the second insulating layer includes a third sub-insulating layer and a fourth sub-insulating layer, the third sub-insulating layer is composed of part of the insulating layer, and the third sub-insulating layer has a second window at a position corresponding to the first window, and one of the first window and the second window is used for laser irradiation of the metal sealing layer so that the metal sealing layer is welded to the metal foil layer of the packaging body exposed from the second groove through the other, and the fourth sub-insulating layer is filled in the second window.

[0019] According to some embodiments of the present invention, the multiple edge sealing structures include a first edge sealing structure, which is folded toward the packaging body. The first edge sealing portion of the first edge sealing structure has a first groove facing the packaging body, the metal sealing layer is exposed from the first groove, the insulation layer of the packaging body corresponding to the first groove has a second groove, the metal foil layer inside the packaging body is exposed from the second groove, and the metal sealing layer is welded to the metal foil layer of the packaging body exposed from the second groove through the first groove.

[0020] According to some embodiments of the present invention, the soft-pack battery includes an insulating segment, which is connected between the edge sealing structure and the second wall. The insulating segment includes a third insulating layer, a third metal foil layer, a first melt adhesive layer, a second melt adhesive layer, a fourth metal foil layer and a fourth insulating layer distributed in sequence along its own thickness direction. The insulating layer includes the third insulating layer and the fourth insulating layer, the metal foil layer includes the third metal foil layer and the fourth metal foil layer, and the melt adhesive layer includes the first melt adhesive layer and the second melt adhesive layer.

[0021] The outermost layer of the battery cell body has a hollow metal foil, the inner wall of the accommodating cavity has a third groove, the metal foil layer in the package body is exposed from the third groove, and the hollow metal foil is welded to the metal foil layer exposed from the third groove.

[0022] According to some embodiments of the present invention, the hollow metal foil is located on a side of the battery cell body in the thickness direction of the soft-pack battery, and a projection of the hollow metal foil in the thickness direction of the soft-pack battery is located within the range of the third groove.

[0023] According to some embodiments of the present invention, the edge sealing structure includes a second edge sealing structure, the pole ear includes a pole ear portion, a connecting portion and an insulating portion, one end of the pole ear portion is connected to the battery cell body, and the other end passes through the second edge sealing structure, the insulating portion is sleeved on the outside of the pole ear portion, the connecting portion is sleeved on the outside of the insulating portion, and is welded to the metal sealing layer of the second edge sealing structure.

[0024] An electric device according to an embodiment of the second aspect of the present invention includes the soft-pack battery according to the embodiment of the first aspect.

[0025] In this embodiment, the edge-sealing structure includes a first insulating layer, a metal sealing layer, and a second insulating layer bonded sequentially along its thickness. The insulating layer includes the first insulating layer and the second insulating layer, and the metal foil layer forms the metal sealing layer. As can be seen, compared to the edge-sealing structure in conventional technologies, the edge-sealing structure in this embodiment eliminates the adhesive layer. The thickness of the edge-sealing structure in this embodiment is smaller than that of conventional technologies, which not only reduces the volume but also the weight of the soft-pack battery, thereby increasing the energy density of the soft-pack battery.

[0026] The electrical equipment according to the embodiments of the present invention has at least the following beneficial effects:

[0027] In the soft-pack battery of the first embodiment, the edge sealing structure includes a first insulating layer, a metal sealing layer, and a second insulating layer bonded sequentially along the thickness of the soft-pack battery. The insulating layer includes the first insulating layer and the second insulating layer, and the metal foil layer forms the metal sealing layer. As can be seen, compared to the edge sealing structure in conventional technologies, the edge sealing structure of this embodiment eliminates the adhesive layer. The thickness of the edge sealing structure in this embodiment is smaller than that of conventional technologies, which not only reduces the volume of the soft-pack battery but also reduces its weight, thereby increasing the energy density of the soft-pack battery and thus improving the battery life of the electrical device in this embodiment.

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

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0030] Figure 1 This is a schematic structural diagram of a soft packaging film in the prior art;

[0031] Figure 2 It is a soft pack battery in the prior art;

[0032] Figure 3 for Figure 2 A magnified schematic diagram of area A in the middle;

[0033] Figure 4 This is a schematic structural diagram of a first soft-pack battery according to an embodiment of the first aspect of the present invention;

[0034] Figure 5 for Figure 4 Magnified view of area B in the middle;

[0035] Figure 6 This is a schematic structural diagram of a second soft-pack battery according to an embodiment of the first aspect of the present invention;

[0036] Figure 7 for Figure 6 A cross-sectional view of the first edge sealing structure of the medium soft-pack battery after being folded toward the package body;

[0037] Figure 8 for Figure 7 Magnified view of area C in the middle;

[0038] Figure 9 A partial cross-sectional view of a second soft-pack battery according to an embodiment of the first aspect of the present invention;

[0039] Figure 10 This is a partial schematic diagram of a third soft-pack battery according to an embodiment of the first aspect of the present invention;

[0040] Figure 11 for Figure 10 Magnified view of area D in the middle;

[0041] Figure 12 for Figure 6 Magnified view of area E in middle.

[0042] Reference numerals:

[0043] Encapsulation soft film 1, insulation layer 2, metal foil layer 3, melt adhesive layer 4;

[0044] An existing edge sealing structure 10, an existing first insulating layer 11, an existing first metal foil layer 12, a melt-adhesive sealing layer 13, an existing second metal foil layer 14, and an existing second insulating layer 15;

[0045] Soft package shell 100, package body 110, first wall 111, second wall 112, accommodating cavity 113, second groove 114, edge sealing structure 120, first edge sealing structure 1201, second edge sealing structure 1202, first insulating layer 121, metal sealing layer 122, second insulating layer 123, first groove 124, insulating segment 130, third insulating layer 131, third metal foil layer 132, first melt adhesive layer 133, second melt adhesive layer 134, fourth metal foil layer 135, fourth insulating layer 136;

[0046] Battery cell 200, battery cell body 210, tab 220, tab portion 221, insulating portion 222, connecting portion 223;

[0047] Weld seam structure 300. DETAILED DESCRIPTION

[0048] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0049] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0050] In the description of the present invention, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0051] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0052] In the description of the present invention, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0053] In the existing soft-pack battery manufacturing technology, the packaging process usually uses a heat-sealing head to fuse the PP layers in the two layers of aluminum-plastic film together to form a sealing edge structure. In order to maintain sufficient packaging strength and sealing of the sealing edge structure, the PP layer needs to have a certain thickness and width, which increases the size of the sealing edge structure, thereby increasing the volume of the soft-pack battery and reducing the energy density of the soft-pack battery.

[0054] In view of the above background, the present invention proposes a soft-pack battery that can have a higher energy density. It should be noted that the length direction in the accompanying drawings is the length direction of the soft-pack battery, the width direction is the width direction of the soft-pack battery, and the thickness direction is the thickness direction of the soft-pack battery. In order to more clearly show the edge sealing structure, the edge sealing structure in some of the accompanying drawings is not folded toward the packaging body, and when the edge sealing structure is not folded toward the packaging body, the length direction of the edge sealing structure corresponds to the length direction of the soft-pack battery, the width direction of the edge sealing structure corresponds to the width direction of the soft-pack battery, and the thickness direction of the edge sealing structure corresponds to the thickness direction of the soft-pack battery. In addition, the square structure of the soft-pack battery cannot be interpreted as the only limitation to this application. The soft-pack battery can also be a structure of any shape such as a pentagon or hexagon. Reference Figures 1 to 5 , Figure 1 This is a schematic diagram of the structure of a soft packaging film in the prior art. Figure 2 It is a soft pack battery in the prior art. Figure 3 for Figure 2 A magnified schematic diagram of area A in the middle. Figure 4 This is a schematic structural diagram of a first soft-pack battery according to an embodiment of the first aspect of the present invention. Figure 5 for Figure 4 An enlarged view of area B in the middle shows a soft-pack battery according to an embodiment of the first aspect of the present invention, comprising a soft-pack shell 100 and a battery cell 200 .

[0055] The soft package shell 100 is formed by processing a packaging soft film 1, which includes an insulating layer 2, a metal foil layer 3 and a melt adhesive layer 4 (such as Figure 1 As shown), the soft package shell 100 is made of a film such as an aluminum-plastic film or a steel-plastic film, and correspondingly, the metal foil layer 3 is, for example, an aluminum foil or a steel foil, and the insulating layer 2 is, for example, an insulating material such as a nylon layer or a PET layer (polyethylene terephthalate layer). Preferably, the metal foil layer 3 is an aluminum layer, and the melt adhesive layer 4 is a PP layer (polypropylene layer).

[0056] The soft package shell 100 includes a packaging body 110 and a plurality of edge sealing structures 120 (such as Figure 4As shown), the package body 110 has a accommodating cavity 113, the battery cell 200 includes a battery cell body 210 and a tab 220, the battery cell body 210 is located in the accommodating cavity 113, the tab 220 is connected to the battery cell body 210, and extends out of the soft-pack shell 100. The package body 110 includes two first walls 111 spaced apart along the thickness direction of the soft-pack battery, and a second wall 112 located between the two first walls 111 and surrounding. Each edge sealing structure 120 is directly connected to the second wall 112 or indirectly connected to the second wall 112 through other components, such as in the following embodiment of the soft-pack battery further including an insulating segment 130, one side of the insulating segment 130 is connected to the second wall 112, and the other side is connected to the edge sealing structure 120, so that the edge sealing structure 120 is indirectly connected to the second wall 112 through the insulating segment 130 (as shown in FIG. Figure 10 As shown). For example, the soft pack battery has a square structure (as shown Figure 4 As shown, the soft-pack battery has a set length and a set width. The second wall 112 includes two side walls in the width direction of the soft-pack battery, and a bottom wall and a top wall spaced apart in the length direction of the soft-pack battery. Correspondingly, the edge sealing structure 120 includes side edge sealing connected to the side walls and a top edge sealing connected to the top wall, or the edge sealing structure 120 also includes a bottom edge sealing connected to the bottom wall.

[0057] The edge sealing structure 120 includes a first insulating layer 121, a metal sealing layer 122 and a second insulating layer 123 (such as Figure 5As shown in FIG, the first insulating layer 121 and the second insulating layer 123 are located at the outermost layer of the edge sealing structure 120, and the thickness of the first insulating layer 121 and the second insulating layer 123 is no greater than the thickness of the insulating layer 2 of the encapsulating soft film 1. For example, the first insulating layer 121 and the second insulating layer 123 are both formed by portions of the insulating layer 2 of the encapsulating soft film 1. In this case, the thickness of the first insulating layer 121 and the second insulating layer 123 are both equal to the thickness of the insulating layer 2. The metal foil layer 3 forms a metal sealing layer 122. For example, in some embodiments, the edge sealing structure 120 includes a first edge sealing portion and a second edge sealing portion distributed along its thickness. The first edge sealing portion includes a first insulating layer 121 and a first metal foil layer bonded sequentially along its thickness. The second edge sealing portion includes a second insulating layer 123 and a second metal foil layer bonded sequentially along its thickness. The metal foil layer 3 includes a first metal foil layer and a second metal foil layer. The first and second metal foil layers are welded together to form the metal sealing layer 122. Welding includes, but is not limited to, laser welding and ultrasonic welding. The metal sealing layer 122 formed by welding has a sealing performance superior to that of the conventional melt-sealing layer 13, thereby improving the sealing performance of the soft-pack battery and reducing the risk of leakage. In other words, under the premise of maintaining the same sealing performance, the edge sealing structure 120 of the soft-pack battery in this embodiment can be made narrower, further improving the energy density of the soft-pack battery. When the second metal foil layer forms the metal sealing layer 122, the thickness of the edge sealing structure 120 is smaller, thereby further improving the energy density of the soft-pack battery.

[0058] Alternatively, as in some embodiments, the edge-sealing structure 120 includes a first edge-sealing portion and a second edge-sealing portion distributed along its thickness. The first edge-sealing portion includes a first insulating layer 121, and the second edge-sealing portion includes a second insulating layer 123 and a second metal foil layer bonded sequentially along its thickness. The metal foil layer 3 includes a second metal foil layer. The first insulating layer 121 is bonded to the second metal foil layer, and the second metal foil layer constitutes a metal sealing layer 122. Specifically, the thickness of the metal sealing layer 122 is equal to the thickness of a single metal foil layer 3, thereby further reducing the thickness of the edge-sealing structure. During processing, the adhesive layer 4 and metal foil layer 3 located in the first edge-sealing portion are removed, while the insulating layer 2 is retained. The remaining insulating layer 2 becomes the first insulating layer 121. The adhesive layer 4 located in the second edge-sealing portion is removed, while the metal foil layer 3 and insulating layer 2 are retained. The remaining metal foil layer 3 becomes the second metal foil layer, while the remaining insulating layer 2 becomes the second insulating layer 123. The first insulating layer 121 is bonded to the second metal foil layer, thereby forming a sealed cavity 113.

[0059] It can be seen from the above embodiments that compared with the edge sealing structure in the traditional technology (specifically Figure 2The edge sealing structure 10 in the present embodiment is the edge sealing structure 120 in which the melt adhesive layer 4 is removed. The thickness of the edge sealing structure 120 in the present embodiment is relatively smaller than that of the edge sealing structure 120 in the conventional technology. Figure 2 and 3 As shown, the edge sealing structure 120 in the prior art includes an existing first insulating layer 11, an existing first metal foil layer 12, a melt-adhesive sealing layer 13, an existing second metal foil layer 14 and an existing second insulating layer 15, which are sequentially distributed along the thickness direction of the existing first insulating layer 11 and the existing second insulating layer 15. The existing first insulating layer 11 and the existing second insulating layer 15 are both formed as part of the insulating layer 2, the melt-adhesive sealing layer 13 is formed by partial fusion of two layers of melt-adhesive layers 4, and the existing first metal foil layer 12 and the existing second metal foil layer 14 are both formed as part of the metal foil layer 3. Therefore, the thickness L1 of the existing edge sealing structure 10 = the thickness of the two insulating layers 2 + the thickness of the two metal foil layers 3 + the thickness of the melt-adhesive sealing layer 13, while the thickness L2 of the edge sealing structure 120 in this embodiment = the thickness of the two insulating layers 2 + the thickness of the metal sealing layer 122. L2 is significantly smaller than L1, which can not only reduce the volume of the soft-pack battery, but also reduce the weight of the soft-pack battery, thereby improving the energy density of the soft-pack battery. For example, part of the edge sealing structure 120 of the soft-pack battery (specifically the first edge sealing structure 1201 below) is folded toward the second wall 112. Since the thickness of the first edge sealing structure 1201 is smaller, the width of the soft-pack battery can be made smaller.

[0060] Furthermore, in some embodiments, the thickness of the metal sealing layer 122 is less than or equal to the thickness of the two metal foil layers 3. For example, the metal sealing layer 122 is formed by laser welding two metal foil layers 3, or is formed by a single metal foil layer 3 as in the above embodiment, thereby further reducing the thickness of the edge sealing structure 120.

[0061] As can be seen from the above embodiments, in some embodiments, the first insulating layer 121 and the second insulating layer 123 can be formed by portions of the insulating layer 2 of the encapsulating soft film 1. Taking the example of welding the first metal foil layer and the second metal foil layer to form the metal sealing layer 122, during processing, the adhesive layer 4 located at the first and second edge sealing portions is removed by laser processing or machining, while retaining the insulating layer 2 and the metal foil layer 3. Among them, the insulating layer 2 located at the first edge sealing portion is the first insulating layer 121, the insulating layer 2 located at the second edge sealing portion is the second insulating layer 123, the metal foil layer 3 located at the first edge sealing portion is the first metal foil layer, and the metal foil layer 3 located at the second edge sealing portion is the second metal foil layer. The first metal foil layer and the second metal foil layer are welded together to form a metal sealing layer 122 by a welding process that does not require direct contact, such as an induction welding process or an ultrasonic welding process, without burning through the first insulating layer 121 and the second insulating layer 123 located on the outer layer, thereby ensuring the insulation of the edge sealing structure 120 to improve the safety of the battery, and there is no need to repair or fill the first insulating layer 121 subsequently, thereby improving the processing efficiency of the soft-pack battery of this embodiment.

[0062] As can be seen from the above embodiments, a specific welding process needs to be adopted during the processing of the above structure to reduce damage to the first insulating layer 121 and the second insulating layer 123. However, since welding the first metal foil layer and the second metal foil layer will generate high temperature and transfer it to the first insulating layer 121 and the second insulating layer 123, it may cause certain damage to the first insulating layer 121 and the second insulating layer 123. To this end, in some embodiments, when the edge sealing structure 120 includes a first edge sealing portion and a second edge sealing portion distributed along its own thickness direction, the first edge sealing portion includes the first insulating layer 121 and the first metal foil layer bonded in sequence along its own thickness direction. The second edge sealing portion includes the second insulating layer 123 and the second metal foil layer bonded in sequence along its own thickness direction, the metal foil layer 3 includes the first metal foil layer and the second metal foil layer, and the first metal foil layer and the second metal foil layer are welded to each other to form the metal sealing layer 122. The first insulating layer 121 includes a first sub-insulating layer and a second sub-insulating layer. The first sub-insulating layer is composed of a portion of the insulating layer 2. The first sub-insulating layer has a first window. The first window is used for laser irradiation of the first metal foil layer to weld the first metal foil layer to the second metal foil layer. The second sub-insulating layer is filled in the first window, thereby improving the performance of the first insulating layer 121.

[0063] Specifically, in this embodiment, the first insulating layer 121 includes a first sub-insulating layer having a first window. During processing, a laser can directly illuminate the first metal foil layer through the first window. After the first and second metal foil layers are welded together, the second sub-insulating layer is filled into the first window, thereby reducing the effects of high temperatures on the first insulating layer. The second sub-insulating layer and the second sub-insulating layer can be made of the same material, such as nylon, but are not limited to this. They can also be made of different materials as long as the performance requirements of the first insulating layer are met.

[0064] Based on the above embodiment, the edge sealing structure 120 is a rectangular structure, comprising a first edge and a second edge disposed opposite each other along its length, and a third edge disposed opposite the package body 110 along its width. The first window is rectangular in shape and extends to the first, second, and third edges. Specifically, during processing, the corresponding insulating layer 2 on the edge sealing structure 120 is first completely removed, and then the second sub-insulating layer is added after welding is complete, further reducing the impact of high temperatures on the first insulating layer during processing. Furthermore, the thickness of the second sub-insulating layer is less than that of the insulating layer 2, thereby further reducing the thickness of the edge sealing structure 120 and improving the energy density of the soft-pack battery.

[0065] In some embodiments, second insulating layer 123 includes a third sub-insulating layer and a fourth sub-insulating layer. The third sub-insulating layer is composed of a portion of insulating layer 2. The third sub-insulating layer has a second window at a position corresponding to the first window, and the fourth sub-insulating layer fills the second window. This reduces the impact of high temperatures during the welding process on the second insulating layer, thereby improving the performance of second insulating layer 123 and extending the safety and service life of the soft-pack battery.

[0066] In traditional technologies, in order to improve the energy density of soft-pack batteries, some technologies fold the edge seal toward the package body 110 and provide adhesive between the edge seal and the package body 110. In order to ensure the bonding strength between the edge seal and the package body 110, the edge seal and the package body 110 are bonded together by an additional adhesive. The adhesive will occupy the space between the package body 110 and the edge seal, resulting in a decrease in the energy density of the soft-pack battery. Figures 6 to 8 , Figure 6 This is a schematic structural diagram of a second soft-pack battery according to the first embodiment of the present invention. Figure 7 for Figure 6 Cross-sectional view of the first edge sealing structure of the medium soft pack battery after folding. Figure 8 for Figure 7An enlarged view of the middle C area. In some embodiments, the multiple edge sealing structures 120 include a first edge sealing structure 1201. The first edge sealing structure 1201 is, for example, a side edge sealing of a square soft-pack battery. The first edge sealing structure 1201 is folded toward the package body 110. The first edge sealing structure 1201 has a first groove 124 on the side facing the package body 110. The metal sealing layer 122 is exposed from the first groove 124. The package body 110 has a second groove 114 at the insulating layer 2 corresponding to the first groove 124. The metal foil layer 3 inside the package body 110 is exposed from the second groove 114. The metal sealing layer 122 is welded to the metal foil layer 3 of the package body 110 exposed from the second groove 114 (weld structure 300 as shown). Figure 8 As shown in the figure, to clearly show the welding position), the first edge sealing structure 1201 is connected to the package body 110 without the need for additional adhesive to reduce the size of the soft-pack battery.

[0067] Exemplarily, the soft-pack battery is a prismatic battery, and the first edge-sealing structure 1201 is a side edge-sealing structure, which is folded toward the side wall. The side wall has a second groove 114, and the metal sealing layer 122 in the side edge-sealing structure is welded to the metal foil layer 3 in the side wall. Compared to the traditional method of bonding the first edge-sealing structure 1201 to the second wall 112 with adhesive, this embodiment achieves the connection between the first edge-sealing structure 1201 and the second wall 112 by welding the metal sealing layer 122 in the first edge-sealing structure 1201 to the metal foil layer 3 inside the second wall 112, without the need for adhesive. This makes the width of the soft-pack battery smaller, thereby improving the energy density of the soft-pack battery.

[0068] It should be noted that, in this embodiment, the first edge sealing structure 1201 is not limited to being folded toward the second wall 112, but can also be folded toward the first wall 111. Correspondingly, the first wall 111 has a second groove 114, and the metal in the first edge sealing structure 1201 is welded to the metal foil layer 3 of the first wall 111 exposed from the second groove 114 to reduce the thickness of the soft-pack battery.

[0069] Reference Figure 9 , Figure 9 This is a partial cross-sectional view of the second soft-pack battery of the first embodiment of the present invention. Based on the above embodiment, the shape and size of the second groove 114 are adapted to the first edge sealing structure 1201, the first groove 124 extends to the edge of the first edge sealing structure 1201, and the metal sealing layer 122 is located in the second groove 114 (the weld structure 300 is as shown in FIG. Figure 9(as shown to clearly indicate the welding position), on the one hand, this reduces the risk of metal sealing layer 122 being corroded when exposed to the air or causing a short circuit when in contact with other components; on the other hand, the metal sealing layer 122 is located within the second groove 114, that is, in the thickness direction of the first edge sealing structure 1201 itself, the first edge sealing structure 1201 is partially located inside the package body 110, thereby reducing the space occupied by the first edge sealing structure 1201, thereby reducing the overall size of the soft-pack battery and improving the energy density of the soft-pack battery of this embodiment. Furthermore, in some embodiments, the space between the first edge sealing structure 1201 and the sidewalls of the second groove 114 is filled with an insulating adhesive to further reduce the risk of metal sealing layer 122 being corroded when exposed to the air or causing a short circuit when in contact with other components.

[0070] In some embodiments, the multiple edge-sealing structures 120 include a first edge-sealing structure 1201, which is folded toward the package body 110. The first insulating layer 121 of the first edge-sealing structure 1201 has a first window, which is used to allow laser irradiation of the first metal foil layer, thereby welding the first metal foil layer to the second metal foil layer to form a metal sealing layer 122. A second groove 114 is formed in the insulating layer 2 of the package body 110 corresponding to the first window, through which the metal foil layer 3 within the package body 110 is exposed. The second insulating layer 123 includes a third sub-insulating layer and a fourth sub-insulating layer, with the third sub-insulating layer comprising a portion of the insulating layer. The third sub-insulating layer has a second window at a position corresponding to the first window. One of the first and second windows is used to allow laser irradiation of the metal sealing layer, thereby welding the metal sealing layer 122 to the metal foil layer 3 of the package body 110 exposed from the second groove 114 through the other window. The fourth sub-insulating layer fills the second window. That is, in this embodiment, the first window or the second window is directly used as the first groove 124 as in the above embodiment, and there is no need to repeatedly groove the first insulating layer 121 of the first edge sealing structure 1201, thereby improving the processing efficiency of the soft-pack battery.

[0071] In some embodiments, the edge-sealing structure 120 includes a first edge-sealing portion and a second edge-sealing portion distributed along its thickness. The first edge-sealing portion includes a first insulating layer 121, and the second edge-sealing portion includes a second insulating layer 123 and a second metal foil layer bonded sequentially along its thickness. The metal foil layer 3 includes a second metal foil layer. The first insulating layer 121 is bonded to the second metal foil layer, and the second metal foil layer constitutes a metal sealing layer 122. The multiple edge-sealing structures 120 include a first edge-sealing structure 1201, which is folded toward the package body. The first edge-sealing portion of the first edge-sealing structure 1201 has a first groove 124 facing the package body 110, through which the metal sealing layer 122 is exposed. The package body 110 has a second groove 114 at the insulating layer 2 corresponding to the first groove 124. The metal foil layer 3 within the package body 110 is exposed through the second groove 114. The metal sealing layer 122 is welded to the metal foil layer 3 of the package body 110 exposed through the second groove 114 through the first groove 124. That is, in this embodiment, the sealed accommodating cavity 113 is formed by welding the second edge sealing portion and the package body 110 , thereby reducing the thickness of the edge sealing structure 120 and improving the sealing performance of the soft-pack battery.

[0072] Figure 10 and Figure 11 , Figure 10 This is a partial schematic diagram of the third soft-pack battery of the first embodiment of the present invention. Figure 11 for Figure 10 An enlarged view of the middle D area. In some embodiments, the soft-pack battery includes an insulating segment 130, which is connected between the edge sealing structure 120 and the second wall 112. The insulating segment 130 includes a third insulating layer 131, a third metal foil layer 132, a first melt adhesive layer 133, a second melt adhesive layer 134, a fourth metal foil layer 135 and a fourth insulating layer 136 distributed in sequence along its own thickness direction (when the edge sealing structure 120 is not folded toward the packaging body 110, the thickness direction of the insulating segment 130 corresponds to the thickness direction of the soft-pack battery). The insulating layer 2 includes the third insulating layer 131 and the fourth insulating layer 136, the metal foil layer 3 includes the third metal foil layer 132 and the fourth metal foil layer 135, and the melt adhesive layer 4 includes the first melt adhesive layer 133 and the second melt adhesive layer 134. Specifically, it can be understood that the packaging soft film 1 is processed to form a soft package shell 100 with a accommodating cavity 113, and the inner wall of the accommodating cavity 113 is a melt-adhesive layer 4, which is made of insulating material. While reducing the risk of short circuit of the internal battery cell 200, it can also reduce the risk of corrosion of the metal foil layer 3 by the electrolyte.

[0073] Specifically, the encapsulating soft film 1 includes a dented area and a non-dented area. During processing, a recess for accommodating the battery cell 200 is formed in the dented area using a mold or other method. After folding, the recess forms the accommodating cavity 113. The non-dented area is welded to form the edge sealing structure 120. If the edge sealing structure 120 is directly connected to the second wall 112, the adhesive layer 4 in the non-dented area must be removed, leaving only the adhesive layer 4 in the dented area. Therefore, the processing requires high precision to ensure that the inner wall of the accommodating cavity 113 formed after folding is completely covered by the adhesive layer 4. In this embodiment, an insulating section 130 is further included between the edge sealing structure 120 and the second wall 112. The adhesive layer 4 (first adhesive layer 133 and second adhesive layer 134) is retained in the insulating section 130. In other words, a portion of the adhesive layer 4 surrounding the dent is retained in the non-dented area. Even if there are certain errors in processing, the adhesive layer 4 can still fully cover the inner wall of the accommodating cavity 113, thereby reducing the processing cost of the soft-pack battery. Furthermore, during use, the adhesive layer 4 is at risk of shrinking due to high temperatures or other factors. However, in this embodiment, a portion of the adhesive layer 4 is retained outside the accommodating cavity 113. Even if the adhesive layer 4 shrinks, the accommodating cavity 113 is still fully covered by the adhesive layer 4, thereby improving the safety of the soft-pack battery of this embodiment. It also reduces the risk of corrosion of the metal sealing layer 122 due to contact with the electrolyte, thereby extending the service life of the soft-pack battery.

[0074] Furthermore, in some embodiments, the first adhesive layer 133 and the second adhesive layer 134 are fused together to form an integrated structure to improve the safety of the battery during use and the lifespan of the soft-pack battery. Specifically, soft-pack batteries may expand during use due to factors such as high temperature or internal gas generation. To this end, in this embodiment, the first adhesive layer 133 and the second adhesive layer 134 are fused together to form an integrated structure, reducing the risk of separation of the first adhesive layer 133 and the second adhesive layer 134 due to expansion of the soft-pack battery, thereby further improving the safety and lifespan of the soft-pack battery during use.

[0075] In some embodiments, the outermost layer of the battery cell body 210 has a metal foil, the inner wall of the accommodating cavity 113 has a third groove, the metal foil layer 3 in the packaging body 110 is exposed from the third groove, and the metal foil is welded to the metal foil layer 3 exposed from the third groove, so that the battery cell 200 and the packaging body 110 form an integral structure, thereby improving the performance of the battery cell 200 during collision or falling, and during the charging and discharging process of the battery cell 200, the heat of the battery cell 200 can be quickly transferred to the packaging body 110, and dissipated to the outside world through the packaging body 110, thereby improving the overall safety and reliability of the battery cell 200. Specifically, in this embodiment, the melt layer 4 located on the inner wall of the accommodating cavity 113 has a third groove, the internal metal foil layer 3 is exposed from the third groove, and the outermost side of the battery cell body 210 has a metal hollow foil. The battery cell 200 is, for example, a wound battery cell 200, and the metal hollow foil is, for example, a copper foil at the anode end or an aluminum foil at the cathode end. Preferably, the soft package shell 100 is made of aluminum-plastic film, that is, the metal foil layer 3 is aluminum foil, and the metal hollow foil is a single-sided hollow aluminum foil, or a double-sided hollow aluminum foil, thereby improving the stability of welding between the battery cell body 210 and the packaging body 110.

[0076] Based on the above embodiment, the metal foil is located on the side of the cell body 210 in the thickness direction of the soft-pack battery. The projection of the metal foil in the thickness direction of the soft-pack battery is located within the third groove, meaning that the metal foil layer 3 is located within the third groove. This not only improves the flatness of the soft-pack battery's exterior, but also increases the battery's energy density. Specifically, if the projection of the metal foil is located outside the third groove, the metal foil layer 3 needs to protrude toward the metal foil during welding so that the metal foil layer 3 extends out of the third groove and welds to the metal foil. However, this protrusion of the metal foil layer 3 toward the metal foil will form a pit on the surface of the soft-pack battery. In this embodiment, the projection of the metal foil is located within the third groove. During welding, the metal foil can be directly inserted into the third groove to weld to the metal foil layer 3, without the need for the metal foil layer 3 to protrude. This results in a smoother surface for the soft-pack battery. Furthermore, the location of the metal foil within the third groove reduces the space occupied by the metal foil within the accommodating cavity 113, thereby increasing the energy density of the soft-pack battery. Furthermore, in some embodiments, in the thickness direction of the soft-pack battery, both sides of the battery cell body 210 have metal foil, and correspondingly, the inner wall of the package body 110 has two third grooves arranged opposite to each other, thereby further improving the energy density of the soft-pack battery and the stability during collision and falling.

[0077] Reference Figure 12 , Figure 12 for Figure 6An enlarged view of area E in the center shows that, in some embodiments, the edge sealing structure 120 includes a second edge sealing structure 1202, which is, for example, the top edge sealing structure in a prismatic soft-pack battery. The tab 220 includes a tab portion 221, a connecting portion 223, and an insulating portion 222. One end of the tab portion 221 is connected to the cell body 210, and the other end extends through the second edge sealing structure 1202. The insulating portion 222 is sleeved around the outside of the tab portion 221, and the connecting portion 223 is sleeved around the outside of the insulating portion 222 and welded to the metal sealing layer 122 of the second edge sealing structure 1202. This improves the connection strength between the tab 220 and the second edge sealing structure 1202, thereby enhancing the safety and life of the soft-pack battery. Specifically, a stronger connection helps prevent electrolyte leakage caused by loosening or breaking between the tab 220 and the second edge sealing structure 1202, thereby improving battery safety. The tight connection between the tab 220 and the second edge-sealing structure 1202 helps prevent impurities such as external air and moisture from entering the battery interior, thereby keeping the battery interior dry and clean and extending the battery's service life. Furthermore, during battery cycling, the tight connection between the tab 220 and the second edge-sealing structure 1202 can reduce loosening or damage caused by mechanical stress, helping to maintain the integrity of the battery structure and extending the battery's service life. Furthermore, a stronger connection strength means that the tab 220 can maintain a stable connection during battery cycling, thereby reducing performance degradation or failures caused by poor connection and improving the battery's cycling stability and reliability.

[0078] It should be noted that the accompanying drawings only show a schematic diagram of a single-folded edge structure of the soft-pack battery, but the present invention is not limited thereto. The soft-pack battery of the present application may also have a double-folded edge or a triple-folded edge structure. A double-folded edge is a structure in which the sealing structure 120 is folded in half to form two sub-folded edges, a triple-folded edge is a structure in which the sealing structure 120 is folded in half to form three sub-folded edges, and so on.

[0079] The present invention also provides a method for processing edge sealing of soft-pack batteries. The edge sealing structure 120 includes a first edge sealing portion and a second edge sealing portion distributed along its own thickness direction. The specific steps of the edge sealing structure processing method are: removing the melt adhesive layer 4 located at the first edge sealing portion and the second edge sealing portion, and retaining the insulating layer 2 and the metal foil layer 3. The insulating layer 2 located at the first edge sealing portion is used as the first insulating layer 121, the insulating layer 2 located at the second edge sealing portion is used as the second insulating layer 123, the metal foil layer 3 located at the first edge sealing portion is used as the first metal foil layer, and the metal foil layer 3 located at the second edge sealing portion is used as the second metal foil layer. The first metal foil layer and the second metal foil layer are welded together to form a metal sealing layer 122 to seal the first edge sealing portion and the second edge sealing portion. It can be seen that the edge sealing structure 120 formed by the edge sealing structure processing method of this embodiment has a smaller thickness and higher sealing performance than the traditional edge sealing structure 120 formed by bonding with the melt adhesive layer 4.

[0080] In some embodiments, the processing method of the edge sealing structure further includes the following steps: before welding the first metal foil layer and the second metal foil layer together to form the metal sealing layer 122, a first window is processed on the first insulating layer 121 to expose the first metal foil layer through the first window, and a second window is processed on the second insulating layer 123 to expose the second metal foil layer through the second window. A laser is irradiated through the first window to the first metal foil layer, or through the second window to irradiate the second metal foil layer, so as to weld the first metal foil layer and the second metal foil layer to form the metal sealing layer 122. Finally, an insulating material is filled into the first window and the second window to completely cover the metal sealing layer 122. It can be seen that in this embodiment, before welding, grooves are first dug in the first insulating layer 121 and the second insulating layer 123 corresponding to the welding position. After welding is completed, the insulating material is filled to repair the first insulating layer 121 and the second insulating layer 123, thereby reducing the impact of high temperature on the first insulating layer 121 and the second insulating layer 123, thereby improving the performance of the soft-pack battery.

[0081] The electrical equipment of the second embodiment of the present invention is, for example, a mobile phone, a watch, a tablet or a new energy vehicle, and the electrical equipment includes the soft-pack battery of the first embodiment. The edge sealing structure 120 in the soft-pack battery includes a first insulating layer 121, a metal sealing layer 122 and a second insulating layer 123 bonded in sequence along its own thickness direction, the insulating layer 2 includes a first insulating layer 121 and a second insulating layer 123, and the metal foil layer 3 forms the metal sealing layer 122. It can be seen that, compared with the edge sealing structure 120 in the traditional technology, the edge sealing structure 120 of this embodiment removes the melt layer 4, and the thickness of the edge sealing structure 120 in this embodiment is smaller than that of the edge sealing structure 120 in the traditional technology, which can not only reduce the volume of the soft-pack battery but also reduce the weight of the soft-pack battery, so as to improve the energy density of the soft-pack battery, thereby improving the endurance of the electrical equipment of this embodiment.

[0082] While the embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to the embodiments described above. Various modifications may be made within the scope of knowledge possessed by a person skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof may be combined with one another unless there is a conflict.

Claims

1. A soft pack battery, characterized in that: include: A soft-pack shell is formed by processing a soft packaging film, the soft packaging film including an insulating layer, a metal foil layer, and a melt-adhesive layer bonded sequentially along its thickness direction. The soft-pack shell includes a packaging body and multiple edge-sealing structures. The packaging body has a accommodating cavity. The packaging body includes two first walls arranged opposite to each other along the thickness direction of the soft-pack battery, and a second wall located between and surrounding the two first walls. Each of the edge-sealing structures is connected to the second wall. The edge-sealing structure includes a first insulating layer, a metal sealing layer, and a second insulating layer bonded sequentially along its thickness direction. The first insulating layer and the second insulating layer are located at the outermost layers of the edge-sealing structure. The thickness of each of the first insulating layer and the second insulating layer is no greater than the thickness of the insulating layer. The metal foil layer forms the metal sealing layer. The battery cell comprises a battery cell body and a tab. The battery cell body is located in the accommodating cavity. The tab is connected to the battery cell body and extends out of the soft-pack shell.

2. The soft pack battery according to claim 1, characterized in that: The thickness of the metal sealing layer is less than or equal to the thickness of two layers of the metal foil layers.

3. The soft pack battery according to claim 1, characterized in that The edge sealing structure includes a first edge sealing portion and a second edge sealing portion distributed along its own thickness direction, the first edge sealing portion includes the first insulating layer and the first metal foil layer bonded in sequence along its own thickness direction, the second edge sealing portion includes the second insulating layer and the second metal foil layer bonded in sequence along its own thickness direction, the metal foil layer includes the first metal foil layer and the second metal foil layer, and the first metal foil layer and the second metal foil layer are welded to each other to form the metal sealing layer.

4. The soft pack battery according to claim 3, characterized in that: The first insulating layer includes a first sub-insulating layer and a second sub-insulating layer. The first sub-insulating layer is composed of part of the insulating layer. The first sub-insulating layer has a first window. The first window is used for laser irradiation of the first metal foil layer so that the first metal foil layer and the second metal foil layer are welded. The second sub-insulating layer is filled in the first window.

5. The soft pack battery according to claim 4, characterized in that: The edge sealing structure is a rectangular structure, having a first edge and a second edge arranged opposite to each other in its own length direction, and a third edge arranged opposite to the packaging body in its own width direction. The shape of the first window is rectangular, and the first window extends to the first edge, the second edge and the third edge.

6. The soft pack battery according to claim 5, characterized in that: The thickness of the second sub-insulating layer is smaller than that of the insulating layer.

7. The soft pack battery according to claim 4, characterized in that: The second insulating layer includes a third sub-insulating layer and a fourth sub-insulating layer. The third sub-insulating layer is composed of part of the insulating layer. The third sub-insulating layer has a second window at a position corresponding to the first window. The fourth sub-insulating layer is filled in the second window.

8. The soft pack battery according to claim 1, characterized in that: The first insulating layer and the second insulating layer are both formed by portions of the insulating layer.

9. The soft pack battery according to claim 1, characterized in that: The edge sealing structure includes a first edge sealing portion and a second edge sealing portion distributed along its own thickness direction, the first edge sealing portion includes the first insulating layer, the second edge sealing portion includes the second insulating layer and a second metal foil layer bonded in sequence along its own thickness direction, the metal foil layer includes the second metal foil layer, the first insulating layer is bonded to the second metal foil layer, and the second metal foil layer constitutes the metal sealing layer.

10. The soft pack battery according to any one of claims 1 to 9, characterized in that: The multiple edge sealing structures include a first edge sealing structure, which is folded toward the packaging body. The first edge sealing structure has a first groove on the side facing the packaging body, and the metal sealing layer is exposed from the first groove. The insulation layer of the packaging body corresponding to the first groove has a second groove, and the metal foil layer inside the packaging body is exposed from the second groove. The metal sealing layer is welded to the metal foil layer of the packaging body exposed from the second groove.

11. The soft pack battery according to claim 3, characterized in that: The plurality of edge sealing structures include a first edge sealing structure, the first edge sealing structure is folded toward the package body, the first insulating layer of the first edge sealing structure has a first window, the first window is used for laser irradiation of the first metal foil layer, so that the first metal foil layer and the second metal foil layer are welded to form the metal sealing layer; The package body has a second groove at the insulating layer corresponding to the first window, and the metal foil layer inside the package body is exposed from the second groove; The second insulating layer includes a third sub-insulating layer and a fourth sub-insulating layer, the third sub-insulating layer is composed of part of the insulating layer, the third sub-insulating layer has a second window at a position corresponding to the first window, one of the first window and the second window is used for laser irradiation of the metal sealing layer, so that the metal sealing layer is welded to the metal foil layer of the packaging body exposed from the second groove through the other, and the fourth sub-insulating layer is filled in the second window.

12. The soft pack battery according to claim 9, characterized in that: The multiple edge sealing structures include a first edge sealing structure, which is folded toward the packaging body. The first edge sealing portion of the first edge sealing structure has a first groove facing the packaging body, and the metal sealing layer is exposed from the first groove. The insulation layer of the packaging body corresponding to the first groove has a second groove, and the metal foil layer inside the packaging body is exposed from the second groove. The metal sealing layer is welded to the metal foil layer of the packaging body exposed from the second groove through the first groove.

13. The soft pack battery according to claim 1, characterized in that The soft-pack battery includes an insulating segment, which is connected between the edge sealing structure and the second wall. The insulating segment is sequentially distributed along its thickness direction with a third insulating layer, a third metal foil layer, a first melt adhesive layer, a second melt adhesive layer, a fourth metal foil layer and a fourth insulating layer. The insulating layer includes the third insulating layer and the fourth insulating layer, the metal foil layer includes the third metal foil layer and the fourth metal foil layer, and the melt adhesive layer includes the first melt adhesive layer and the second melt adhesive layer.

14. The soft pack battery according to claim 1, characterized in that: The outermost layer of the battery cell body has a hollow metal foil, the inner wall of the accommodating cavity has a third groove, the metal foil layer in the package body is exposed from the third groove, and the hollow metal foil is welded to the metal foil layer exposed from the third groove.

15. The soft pack battery according to claim 14, characterized in that: The hollow metal foil is located on a side of the battery cell body in the thickness direction of the soft-pack battery. In the thickness direction of the soft-pack battery, the projection of the hollow metal foil is located within the range of the third groove.

16. The soft pack battery according to claim 1, characterized in that: The edge sealing structure includes a second edge sealing structure, and the pole ear includes a pole ear part, a connecting part and an insulating part. One end of the pole ear part is connected to the battery cell body, and the other end passes through the second edge sealing structure. The insulating part is sleeved on the outside of the pole ear part, and the connecting part is sleeved on the outside of the insulating part and welded to the metal sealing layer of the second edge sealing structure.

17. Electrical equipment, characterized in that: The soft pack battery comprises the soft pack battery according to any one of claims 1 to 16.

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