Soft package battery and electric equipment

Abstract

The invention discloses a soft package battery and electric equipment. The soft package battery comprises a soft package shell and a battery cell, the soft package shell is formed by processing a packaging soft film, the packaging soft film comprises an insulating layer, a metal foil layer and a melt glue layer which are sequentially adhered along the thickness direction of the packaging soft film, the soft package shell comprises a packaging main body and a plurality of edge sealing structures, the packaging main body is provided with a containing cavity, the battery cell comprises a battery cell main body and a tab, the battery cell main body is positioned in the containing cavity, and the tab extends out of the soft package shell. The edge sealing structure comprises a first insulating layer, a metal sealing layer and a second insulating layer which are sequentially bonded in the thickness direction of the edge sealing structure, the insulating layers comprise the first insulating layer and the second insulating layer, the metal foil layers form the metal sealing layer, and the thickness of the metal sealing layer is smaller than or equal to the thickness of the two metal foil layers. Not only can the volume of the soft package battery be reduced, but also the weight of the soft package battery can be reduced, so that the energy density of the soft package battery is improved.

Description

Technical Field

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

[0002] In the existing soft-pack battery manufacturing technology, the encapsulation process usually uses a heat-sealing head to fuse the PP layers in two layers of aluminum-plastic film together to form a sealing edge structure. And in order to maintain sufficient encapsulation strength and sealing performance 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. For this purpose, the present invention provides a soft-pack battery, and the sealing edge structure of the soft-pack battery has a smaller size, so that the soft-pack battery has a higher energy density.

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

[0005] The soft-pack battery according to the first aspect embodiment of the present invention includes a soft-pack housing and an electric core.

[0006] The soft-pack housing is formed by processing an encapsulation soft film, the encapsulation soft film includes an insulating layer, a metal foil layer and a melting adhesive layer bonded in sequence along its thickness direction, the soft-pack housing includes an encapsulation main body and a plurality of sealing edge structures, the encapsulation main body has a receiving cavity, the encapsulation main body includes two first walls oppositely arranged along the thickness direction of the soft-pack battery, and a second wall located between the two first walls and arranged in a surrounding manner, each of the sealing edge structures is connected to the second wall, the sealing edge structure includes a first insulating layer, a metal sealing layer and a second insulating layer bonded in sequence along its thickness direction, the first insulating layer and the second insulating layer are located on the outermost layer of the sealing edge structure, the thicknesses of the first insulating layer and the second insulating layer are both 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 thicknesses of the two metal foil layers; the electric core includes an electric core main body and a tab, the electric core main body is located in the receiving cavity, and the tab is connected to the electric core main body and extends out of the soft-pack housing.

[0007] The soft-pack battery according to the embodiment of the present invention has at least the following beneficial effects: In this embodiment, the edge-sealing structure includes a first insulating layer, a metal sealing layer, and a second insulating layer adhesively bonded in sequence along its thickness direction. The first insulating layer and the second insulating layer are located on the outermost layers of the edge-sealing structure, and the metal foil layer forms the metal sealing layer. It can be seen that, compared with the edge-sealing structure in the traditional technology, the edge-sealing structure in this embodiment at least removes the original adhesive layer of the encapsulation soft film. Therefore, the thickness of the edge-sealing structure in this embodiment is relatively smaller than that of the edge-sealing structure 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 to improve the energy density of the soft-pack battery.

[0008] According to some embodiments of the present invention, the thickness of the metal sealing layer is less than or equal to the thickness of the two metal foil layers.

[0009] 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 thickness direction. The first edge-sealing portion includes the first insulating layer and the first metal foil layer adhesively bonded in sequence along its thickness direction. The second edge-sealing portion includes the second insulating layer and the second metal foil layer adhesively bonded in sequence along its 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.

[0010] 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 formed by a part of the insulating layer. The first sub-insulating layer has a first window for laser to irradiate the first metal foil layer to weld the first metal foil layer and the second metal foil layer, and the second sub-insulating layer is filled in the first window.

[0011] According to some embodiments of the present invention, the edge-sealing structure is a rectangular structure. The edge-sealing structure has a first edge and a second edge disposed opposite to each other in its length direction, and a third edge disposed opposite to the encapsulation main body in its 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.

[0012] According to some embodiments of the present invention, the thickness of the second sub-insulating layer is less than the thickness of the insulating layer.

[0013] 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 formed by a 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.

[0014] According to some embodiments of the present invention, both the first insulating layer and the second insulating layer are constituted by parts of the insulating layer.

[0015] According to some embodiments of the present invention, the edge-sealing structure includes a first edge-sealing part and a second edge-sealing part distributed along the thickness direction of itself. The first edge-sealing part includes the first insulating layer. The second edge-sealing part includes the second insulating layer and the second metal foil layer adhesively bonded in sequence along the thickness direction of itself. The metal foil layer includes the second metal foil layer. The first insulating layer is adhesively bonded to the second metal foil layer, and the second metal foil layer constitutes the metal sealing layer.

[0016] According to some embodiments of the present invention, among the multiple edge-sealing structures, there is a first edge-sealing structure which is turned over towards the encapsulation main body. One side of the first edge-sealing structure facing the encapsulation main body has a first groove, and the metal sealing layer is exposed from the first groove. At the insulating layer of the encapsulation main body corresponding to the first groove, there is a second groove, and the metal foil layer inside the encapsulation main body is exposed from the second groove. The metal sealing layer is welded to the metal foil layer exposed from the second groove of the encapsulation main body.

[0017] According to some embodiments of the present invention, among the multiple edge-sealing structures, there is a first edge-sealing structure which is turned over towards the encapsulation main body. The first insulating layer of the first edge-sealing structure has a first window for laser to irradiate 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. At the insulating layer of the encapsulation main body corresponding to the first window, there is a second groove, and the metal foil layer inside the encapsulation main 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 constituted by parts of the insulating layer. The third sub-insulating layer has a second window at the position corresponding to the first window. One of the first window and the second window is for laser to irradiate the metal sealing layer so that the metal sealing layer is welded to the metal foil layer exposed from the second groove of the encapsulation main body through the other one, and the fourth sub-insulating layer is filled in the second window.

[0018] According to some embodiments of the present invention, among the multiple edge-sealing structures, there is a first edge-sealing structure which is folded towards the encapsulation main body. The first edge-sealing portion of the first edge-sealing structure has a first groove facing the encapsulation main body. The metal sealing layer is exposed from the first groove. At the insulating layer of the encapsulation main body corresponding to the first groove, there is a second groove. The metal foil layer inside the encapsulation main body is exposed from the second groove. The metal sealing layer is welded to the metal foil layer exposed from the second groove of the encapsulation main body through the first groove.

[0019] According to some embodiments of the present invention, the soft-pack battery includes an insulating section which is connected between the edge-sealing structure and the second wall. The insulating section includes a third insulating layer, a third metal foil layer, a first glue layer, a second glue layer, a fourth metal foil layer, and a fourth insulating layer which are 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. The glue layer includes the first glue layer and the second glue layer.

[0020] The outermost layer of the battery cell main body has a metal empty foil. The inner wall of the accommodating cavity has a third groove. The metal foil layer in the encapsulation main body is exposed from the third groove. The metal empty foil is welded to the metal foil layer exposed from the third groove.

[0021] According to some embodiments of the present invention, the metal empty foil is located on the side of the battery cell main body in the thickness direction of the soft-pack battery. In the thickness direction of the soft-pack battery, the projection of the metal empty foil is within the range of the third groove.

[0022] According to some embodiments of the present invention, among the edge-sealing structures, there is a second edge-sealing structure. The tab includes a tab portion, a connecting portion, and an insulating portion. One end of the tab portion is connected to the battery cell main body, and the other end passes through the second edge-sealing structure. The insulating portion is sleeved outside the tab portion. The connecting portion is sleeved outside the insulating portion and is welded to the metal sealing layer of the second edge-sealing structure.

[0023] An electrical device according to the embodiment of the second aspect of the present invention includes the soft-pack battery of the embodiment of the first aspect.

[0024] In this embodiment, the edge-sealing structure includes a first insulating layer, a metal sealing layer, and a second insulating layer adhesively bonded in sequence along its own thickness direction. The insulating layer includes the first insulating layer and the second insulating layer, and the metal foil layer forms the metal sealing layer. It can be seen that, compared with the edge-sealing structure in the traditional technology, the edge-sealing structure in this embodiment removes the glue layer, and the thickness of the edge-sealing structure in this embodiment is relatively smaller than that of the edge-sealing structure in the traditional technology. It 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.

[0025] The electrical equipment according to the embodiment of the present invention has at least the following beneficial effects: Adopting the soft-pack battery of the first aspect embodiment, the edge-sealing structure in the soft-pack battery includes a first insulating layer, a metal sealing layer, and a second insulating layer adhesively bonded in sequence along its own thickness direction. The insulating layer includes the first insulating layer and the second insulating layer, and the metal foil layer forms the metal sealing layer. It can be seen that, compared with the edge-sealing structure in the traditional technology, the edge-sealing structure in this embodiment removes the glue layer, and the thickness of the edge-sealing structure in this embodiment is relatively smaller than that of the edge-sealing structure in the traditional technology. It 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 in this embodiment.

[0026] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0027] The following further describes the present invention in conjunction with the drawings and embodiments, where: Figure 1 It is a schematic structural diagram of a structure for encapsulating a soft film in the prior art; Figure 2 It is a soft-pack battery in the prior art; Figure 3 is Figure 2 an enlarged schematic view of area A in Figure 4 It is a schematic structural diagram of the first soft-pack battery of the first aspect embodiment of the present invention; Figure 5 is Figure 4 an enlarged view of area B in Figure 6 It is a schematic structural diagram of the second soft-pack battery of the first aspect embodiment of the present invention; Figure 7 is Figure 6 a sectional view after the first edge-sealing structure of the soft-pack battery in Figure 8 is Figure 7 an enlarged view of area C in Figure 9 It is a partial cross-sectional view of the second soft-pack battery according to the second embodiment of the first aspect of the present invention; Figure 10 It is a partial schematic view of the third soft-pack battery according to the second embodiment of the first aspect of the present invention; Figure 11 is Figure 10 an enlarged view of region D in; Figure 12 is Figure 6 an enlarged view of region E in.

[0028] Reference numerals: Encapsulation soft film 1, insulation layer 2, metal foil layer 3, and melting glue layer 4; Existing edge-sealing structure 10, existing first insulation layer 11, existing first metal foil layer 12, melting glue sealing layer 13, existing second metal foil layer 14, existing second insulation layer 15; Soft-pack outer shell 100, encapsulation main body 110, first wall 111, second wall 112, accommodation cavity 113, second groove 114, edge-sealing structure 120, first edge-sealing structure 1201, second edge-sealing structure 1202, first insulation layer 121, metal sealing layer 122, second insulation layer 123, first groove 124, insulation section 130, third insulation layer 131, third metal foil layer 132, first melting glue layer 133, second melting glue layer 134, fourth metal foil layer 135, fourth insulation layer 136; Electric core 200, electric core main body 210, tab 220, tab part 221, insulation part 222, connection part 223; Weld seam structure 300. Detailed implementation manners

[0029] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0030] In the description of the present invention, it should be understood that the orientation or positional relationship involved in the orientation description, such as up, down, front, back, left, right, etc., is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0031] In the description of the present invention, several means more than one, and multiple means more than two. Understandings such as greater than, less than, exceeding, etc. do not include the present number, and understandings such as above, below, within, etc. include the present number. If the first and second are described, it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0032] In the description of the present invention, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0033] In the description of the present invention, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0034] In the existing soft-pack battery manufacturing technology, the encapsulation process usually uses a heat-sealing head to fuse the PP layers in two layers of aluminum-plastic film together to form a sealing edge structure. And in order to maintain sufficient encapsulation strength and sealing performance 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.

[0035] In view of the above background, the present invention provides a soft-pack battery that can have a higher energy density. It should be noted that in the drawings, the length direction 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. Among them, in order to more clearly show the sealing edge structure, in some drawings, the sealing edge structure is not folded towards the encapsulation main body. And when the sealing edge structure is not folded towards the encapsulation main body, the length direction of the sealing edge structure corresponds to the length direction of the soft-pack battery, the width direction of the sealing edge structure corresponds to the width direction of the soft-pack battery, and the thickness direction of the sealing edge structure corresponds to the thickness direction of the soft-pack battery. In addition, the fact that the soft-pack battery is a square structure cannot be construed as the only limitation of this application. The soft-pack battery can also be a structure of any shape such as a pentagon or a hexagon. Refer to Figures 1 to 5 , Figure 1 is a schematic diagram of a structure for encapsulating a soft film in the prior art, Figure 2 is a soft-pack battery in the prior art, Figure 3 is Figure 2An enlarged schematic view of area A in Figure 4 is a schematic structural view of the first soft-pack battery according to the first aspect of the present invention. Figure 5 It is Figure 4 an enlarged view of area B in

[0036] The soft-pack outer shell 100 is formed by processing a packaging soft film 1. The packaging soft film 1 includes an insulating layer 2, a metal foil layer 3, and a melting adhesive layer 4 adhesively bonded in sequence along its own thickness direction (as Figure 1 shown). The soft-pack outer shell 100 is made of a thin film such as an aluminum-plastic film or a steel-plastic film, etc. Correspondingly, the metal foil layer 3 is, for example, an aluminum foil or a steel foil, and the insulating layer 2 is an insulating material such as a nylon layer or a PET layer (polyethylene terephthalate layer), etc. Preferably, the metal foil layer 3 is an aluminum layer, and the melting adhesive layer 4 is a PP layer (polypropylene layer).

[0037] The soft-pack outer shell 100 includes a packaging main body 110 and a plurality of edge-sealing structures 120 (as Figure 4 shown). The packaging main body 110 has a receiving cavity 113. The battery cell 200 includes a battery cell main body 210 and a tab 220. The battery cell main body 210 is located in the receiving cavity 113, and the tab 220 is connected to the battery cell main body 210 and extends out of the soft-pack outer shell 100. The packaging main 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 arranged in a surrounding manner. Each edge-sealing structure 120 is directly connected or indirectly connected to the second wall 112 through other components. As in the following embodiments, the soft-pack battery further includes an insulating section 130. One side of the insulating section 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 section 130 (as Figure 10 shown). Exemplarily, the soft-pack battery is a square structure (as Figure 4 shown). The soft-pack battery includes 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 a side edge-sealing connected to the side wall and a top edge-sealing connected to the top wall, or the edge-sealing structure 120 further includes a bottom edge-sealing connected to the bottom wall.

[0038] The edge-sealing structure 120 includes a first insulating layer 121, a metal sealing layer 122, and a second insulating layer 123 adhesively bonded in sequence along its own thickness direction (as Figure 5As shown in the figure, the first insulating layer 121 and the second insulating layer 123 are located on the outermost layer of the edge-sealing structure 120, and the thicknesses of the first insulating layer 121 and the second insulating layer 123 are both not greater than the thickness of the insulating layer 2 of the encapsulation soft film 1. For example, the first insulating layer 121 and the second insulating layer 123 are both composed of parts of the insulating layer 2 of the encapsulation soft film 1. At this time, the thicknesses 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 part and a second edge-sealing part distributed along its own thickness direction. The first edge-sealing part includes a first insulating layer 121 and a first metal foil layer adhesively bonded in sequence along its own thickness direction. The second edge-sealing part includes a second insulating layer 123 and a second metal foil layer adhesively bonded in sequence along its own thickness direction. The metal foil layer 3 includes a first metal foil layer and a second metal foil layer. The first metal foil layer and the second metal foil layer are welded to each other to form the metal sealing layer 122. The welding includes but is not limited to laser welding, ultrasonic welding, etc. The sealing performance of the metal sealing layer 122 formed by welding is higher than that of the melt adhesive sealing layer 13 in the traditional technology, thereby improving the sealing performance of the soft-pack battery and reducing the risk of liquid leakage of the soft-pack battery. In other words, on the premise of 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. For the second metal foil layer to form 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.

[0039] Alternatively, as in some embodiments, the edge-sealing structure 120 includes a first edge-sealing part and a second edge-sealing part distributed along its own thickness direction. The first edge-sealing part includes the first insulating layer 121. The second edge-sealing part includes a second insulating layer 123 and a second metal foil layer adhesively bonded in sequence along its own thickness direction. The metal foil layer 3 includes the second metal foil layer. The first insulating layer 121 is adhesively bonded to the second metal foil layer, and the second metal foil layer forms the metal sealing layer 122, that is, the thickness of the metal sealing layer 122 is equal to the thickness of the single-layer metal foil layer 3, thereby further reducing the thickness of the edge-sealing structure. During the processing, the melt adhesive layer 4 and the metal foil layer 3 located in the first edge-sealing part are removed and the insulating layer 2 is retained. The retained insulating layer 2 is the first insulating layer 121. The melt adhesive layer 4 located in the second edge-sealing part is removed and the metal foil layer 3 and the insulating layer 2 are retained. The retained metal foil layer 3 is the second metal foil layer, and the retained insulating layer 2 is the second insulating layer 123. The first insulating layer 121 is adhesively bonded to the second metal foil layer, so that the accommodation cavity 113 forms a sealed cavity.

[0040] As can be seen from the above embodiments, compared with the edge-sealing structure in the traditional technology (specifically Figure 2In the existing edge-sealing structure 10), the edge-sealing structure 120 of this embodiment removes the molten glue layer 4, and the thickness of the edge-sealing structure 120 in this embodiment is relatively smaller than that of the edge-sealing structure 120 in the prior art. Specifically, as shown in the attached Figure 2 And 3 As shown, the existing edge-sealing structure 120 in the prior art includes an existing first insulating layer 11, an existing first metal foil layer 12, a molten glue sealing layer 13, an existing second metal foil layer 14, and an existing second insulating layer 15 that are sequentially distributed along its own thickness direction. Among them, the existing first insulating layer 11 and the existing second insulating layer 15 are both formed as part of the insulating layer 2, the molten glue sealing layer 13 is formed by partial fusion of two molten glue 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 L 1 of the existing edge-sealing structure 10 = the thickness of two insulating layers 2 + the thickness of two metal foil layers 3 + the thickness of the molten glue sealing layer 13, while the thickness L 2 of the edge-sealing structure 120 in this embodiment = the thickness of two insulating layers 2 + the thickness of the metal sealing layer 122, and L 2 is significantly smaller than L 1 . This can not only reduce the volume of the soft-pack battery but also reduce the weight of the soft-pack battery to improve the energy density of the soft-pack battery. For example, a part of the edge-sealing structure 120 (specifically, the first edge-sealing structure 1201 below) of the soft-pack battery is folded towards 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.

[0041] Furthermore, in some embodiments, the thickness of the metal sealing layer 122 is less than or equal to the thickness of 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. Thus, the thickness of the edge-sealing structure 120 is further reduced.

[0042] As can be seen from the above embodiments, in some embodiments, the first insulating layer 121 and the second insulating layer 123 may be formed by a part of the insulating layer 2 of the encapsulation soft film 1. Taking the case where the first metal foil layer and the second metal foil layer are welded to each other to form the metal sealing layer 122 as an example, during the processing, the glue melting layer 4 located at the first sealing edge portion and the second sealing edge portion is removed by laser processing or machining, etc., and the insulating layer 2 and the metal foil layer 3 are retained. Among them, the insulating layer 2 located at the first sealing edge portion is the first insulating layer 121, the insulating layer 2 located at the second sealing edge portion is the second insulating layer 123, the metal foil layer 3 located at the first sealing edge portion is the first metal foil layer, the metal foil layer 3 located at the second sealing edge portion is the second metal foil layer, and then the first metal foil layer and the second metal foil layer are welded together by a welding process that does not require direct contact, such as an inductive welding process or an ultrasonic welding process, to form the metal sealing layer 122, 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 sealing edge structure 120, improving the safety of the battery, and there is no need to repair and fill the first insulating layer 121 subsequently, thereby improving the processing efficiency of the soft-pack battery in this embodiment.

[0043] 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 the 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 generates high temperature and transfers 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. For this reason, in some embodiments, when the sealing edge structure 120 includes a first sealing edge portion and a second sealing edge portion distributed along its own thickness direction, the first sealing edge portion includes a first insulating layer 121 and a first metal foil layer adhesively bonded in sequence along its own thickness direction. The second sealing edge portion includes a second insulating layer 123 and a second metal foil layer adhesively bonded in sequence along its own thickness direction. The metal foil layer 3 includes a first metal foil layer and a 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 formed by a part of the insulating layer 2, and the first sub-insulating layer has a first window for laser to irradiate the first metal foil layer to weld the first metal foil layer and the second metal foil layer, and the second sub-insulating layer is filled in the first window, thereby improving the performance of the first insulating layer 121.

[0044] Specifically, in this embodiment, the first insulating layer 121 includes a first sub-insulating layer, and the first sub-insulating layer has a first window. During the processing, the laser can directly irradiate the first metal foil layer through the first window. After the first metal foil layer and the second metal foil layer are welded together, the second sub-insulating layer is filled in the first window, so as to reduce the influence of high temperature on the first insulating layer. The second sub-insulating layer and the second sub-insulating layer are, for example, the same material, such as nylon, but are not limited thereto, and may also be different materials, as long as the performance requirements of the first insulating layer are ensured.

[0045] Based on the above embodiment, the edge-sealing structure 120 is a rectangular structure. The edge-sealing structure 120 has a first edge and a second edge that are oppositely arranged in its own length direction, and a third edge that is oppositely arranged with the encapsulation main body 110 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. That is, during the processing, all the corresponding insulating layers 2 on the edge-sealing structure 120 are first removed, and after the welding is completed, the second sub-insulating layer is filled, further reducing the influence of high temperature on the first insulating layer during the processing. On this basis, the thickness of the second sub-insulating layer is less than the thickness of the insulating layer 2, thereby further reducing the thickness of the edge-sealing structure 120 to improve the energy density of the soft-pack battery.

[0046] In some embodiments, the second insulating layer 123 includes a third sub-insulating layer and a fourth sub-insulating layer. The third sub-insulating layer is formed by a part of the 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 is filled in the second window. Thereby reducing the influence of high temperature during the welding process on the second insulating layer, thereby improving the performance of the second insulating layer 123 to improve the safety and service life of the soft-pack battery.

[0047] In the traditional technology, in order to improve the energy density of the soft-pack battery, in some technologies, the edge-sealing is turned over towards the encapsulation main body 110, and an adhesive is provided between the edge-sealing and the encapsulation main body 110. In order to ensure the bonding strength between the edge-sealing and the encapsulation main body 110, the edge-sealing and the encapsulation main body 110 are bonded through an additionally provided adhesive, and the adhesive will occupy the space between the encapsulation main body 110 and the edge-sealing, resulting in a reduction in the energy density of the soft-pack battery. Refer to Figures 6 to 8 , Figure 6 FIG. is a schematic structural diagram of a second soft-pack battery according to a first aspect embodiment of the present invention, Figure 7 is Figure 6 a cross-sectional view of the first edge-sealing structure of the soft-pack battery after being turned over, Figure 8 is Figure 7Enlarged view of region C. In some embodiments, among the plurality of edge-sealing structures 120, there is a first edge-sealing structure 1201. For example, the first edge-sealing structure 1201 is the side edge-sealing of a square soft-pack battery. The first edge-sealing structure 1201 is folded towards the encapsulation main body 110. On the side of the first edge-sealing structure 1201 facing the encapsulation main body 110, there is a first groove 124. The metal sealing layer 122 is exposed from the first groove 124. At the insulation layer 2 corresponding to the first groove 124 of the encapsulation main body 110, there is a second groove 114. The metal foil layer 3 inside the encapsulation main body 110 is exposed from the second groove 114. The metal sealing layer 122 is welded to the metal foil layer 3 exposed from the second groove 114 of the encapsulation main body 110 (the weld structure 300 is as Figure 8 shown to clearly show the welding position), so as to connect the first edge-sealing structure 1201 with the encapsulation main body 110 without additionally setting adhesive, so as to reduce the size of the soft-pack battery.

[0048] Exemplarily, the soft-pack battery is a square battery. The first edge-sealing structure 1201 is a side edge-sealing. The side edge-sealing is folded towards the side wall. The side wall has a second groove 114. The metal sealing layer 122 inside the side edge-sealing is welded to the metal foil layer 3 inside the side wall. Compared with the traditional method of bonding the first edge-sealing structure 1201 to the second wall 112 with adhesive, in this embodiment, the metal sealing layer 122 in the first edge-sealing structure 1201 is welded to the metal foil layer 3 inside the second wall 112 to achieve the connection between the first edge-sealing structure 1201 and the second wall 112 without setting adhesive, so that the width of the soft-pack battery is smaller, thereby improving the energy density of the soft-pack battery.

[0049] It should be noted that in this embodiment, the first edge-sealing structure 1201 is not limited to being folded towards the second wall 112. It can also be folded towards the first wall 111. Correspondingly, the first wall 111 has a second groove 114. The metal etc. inside the first edge-sealing structure 1201 is welded to the metal foil layer 3 exposed from the second groove 114 of the first wall 111 to reduce the thickness of the soft-pack battery.

[0050] Referring to Figure 9 , Figure 9 is a partial cross-sectional view of the second soft-pack battery according to the second embodiment of the first aspect of the present invention. On the basis of 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. The metal sealing layer 122 is located in the second groove 114 (the weld structure 300 is as Figure 9As shown (to clearly show the welding position), on the one hand, it reduces the risk that the metal sealing layer 122 is corroded when exposed to air or short-circuited during 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, a part of the first edge-sealing structure 1201 is located inside the packaging body 110, thereby reducing the space occupied by the first edge-sealing structure 1201, and thus reducing the overall size of the soft-pack battery to improve the energy density of the soft-pack battery in this embodiment. Further, in some embodiments, an insulating adhesive is filled between the first edge-sealing structure 1201 and the side wall of the second groove 114, further reducing the risk that the metal sealing layer 122 is corroded when exposed to air or short-circuited during contact with other components.

[0051] In some embodiments, among the multiple edge-sealing structures 120, there is a first edge-sealing structure 1201. The first edge-sealing structure 1201 is folded towards the packaging body 110. The first insulating layer 121 of the first edge-sealing structure 1201 has a first window for laser to irradiate the first metal foil layer so that the first metal foil layer and the second metal foil layer are welded to form a metal sealing layer 122. There is a second groove 114 at the corresponding insulating layer 2 of the packaging body 110 to the first window, and the metal foil layer 3 inside the packaging body 110 is exposed from the second groove 114. The second insulating layer 123 includes a third sub-insulating layer and a fourth sub-insulating layer, and the third sub-insulating layer is composed of a part of the insulating layer. The third sub-insulating layer has a second window at the position corresponding to the first window. One of the first window and the second window is used for laser to irradiate the metal sealing layer, so that the metal sealing layer 122 is welded to the metal foil layer 3 exposed from the second groove 114 of the packaging body 110 through the other, and the fourth sub-insulating layer is filled in the second window. That is, in this embodiment, the first window or the second window is directly used as the first groove 124 in the above embodiment, without repeatedly grooving the first insulating layer 121 of the first edge-sealing structure 1201, thereby improving the processing efficiency of the soft-pack battery.

[0052] In some embodiments, 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 a first insulating layer 121, and the second edge-sealing portion includes a second insulating layer 123 and a second metal foil layer adhesively bonded in sequence along its own thickness direction. The metal foil layer 3 includes the second metal foil layer. The first insulating layer 121 is adhesively bonded to the second metal foil layer, and the second metal foil layer constitutes the metal sealing layer 122. Among the multiple edge-sealing structures 120, there is a first edge-sealing structure 1201 which is turned over towards the encapsulation body. The first edge-sealing portion of the first edge-sealing structure 1201 has a first groove 124 facing the encapsulation body 110, and the metal sealing layer 122 is exposed from the first groove 124. At the corresponding insulating layer 2 of the encapsulation body 110 to the first groove 124, there is a second groove 114, and the metal foil layer 3 inside the encapsulation body 110 is exposed from the second groove 114. The metal sealing layer 122 is welded to the metal foil layer 3 exposed from the second groove 114 of the encapsulation body 110 through the first groove 124. That is, in this embodiment, a sealed accommodation cavity 113 is formed by welding between the second edge-sealing portion and the encapsulation body 110, while reducing the thickness of the edge-sealing structure 120 and improving the sealing performance of the soft-pack battery.

[0053] Figure 10 and Figure 11 , Figure 10 is a partial schematic view of the third soft-pack battery according to the first aspect embodiment of the present invention. Figure 11 is Figure 10 an enlarged view of region D in. In some embodiments, the soft-pack battery includes an insulating section 130. The insulating section 130 is connected between the edge-sealing structure 120 and the second wall 112. The insulating section 130 includes a third insulating layer 131, a third metal foil layer 132, a first melting adhesive layer 133, a second melting 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 turned over towards the encapsulation body 110, the own thickness direction of the insulating section 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. The melting adhesive layer 4 includes the first melting adhesive layer 133 and the second melting adhesive layer 134. Specifically, it can be understood that the encapsulation soft film 1 is processed to form a soft-pack outer shell 100 with an accommodation cavity 113. The inner wall of the accommodation cavity 113 is the melting adhesive layer 4, and the melting adhesive layer 4 is made of an insulating material, which can reduce the risk of short circuit of the internal battery cell 200 and at the same time reduce the risk of corrosion of the metal foil layer 3 by the electrolyte.

[0054] Specifically, the encapsulation soft film 1 includes a pit area and a non-pit area. During processing, pits for accommodating the battery cell 200 are formed in the pit area by means of a mold or other methods. After folding, an accommodation cavity 113 is formed at the pit. The non-pit area forms a sealing edge structure 120 after welding. If the sealing edge structure 120 is directly connected to the second wall 112, the molten glue layer 4 in the non-pit area needs to be removed, and only the molten glue layer 4 in the pit area is retained. Therefore, a higher precision is required in the processing to ensure that the inner wall of the accommodation cavity 113 formed after folding is completely covered by the molten glue layer 4. In this embodiment, however, an insulating section 130 is further included between the sealing edge structure 120 and the second wall 112. The insulating section 130 retains the molten glue layer 4 (the first molten glue layer 133 and the second molten glue layer 134), that is, a part of the molten glue layer 4 surrounding the pit is retained in the non-pit area. Even if there are certain errors in the processing, it can still ensure that the molten glue layer 4 completely covers the inner wall of the accommodation cavity 113, thereby reducing the processing cost of the soft-pack battery. In addition, during use, the molten glue layer 4 has a risk of shrinking due to high temperature or other factors. In this embodiment, a part of the molten glue layer 4 is also retained outside the accommodation cavity 113. Even if the molten glue layer 4 shrinks, it can still ensure the complete coverage of the molten glue layer 4 in the accommodation cavity 113. Thus, the safety of the soft-pack battery in use is improved. At the same time, the risk of the metal sealing layer 122 being corroded by contact with the electrolyte can be reduced, so as to extend the service life of the soft-pack battery.

[0055] Furthermore, in some embodiments, the first molten glue layer 133 and the second molten glue layer 134 are fused into an integral structure to improve the safety of the battery during use and the service life of the soft-pack battery. Specifically, the soft-pack battery may expand due to factors such as high temperature or gas generated inside during use. Therefore, in this embodiment, the first molten glue layer 133 and the second molten glue layer 134 are fused into an integral structure, reducing the risk of the separation of the first molten glue layer 133 and the second molten glue layer 134 caused by the expansion of the soft-pack battery. Thus, the safety and service life of the soft-pack battery during use are further improved.

[0056] In some embodiments, the outermost layer of the battery cell body 210 has a metal empty foil, the inner wall of the accommodating cavity 113 has a third groove, and the metal foil layer 3 in the encapsulation body 110 is exposed from the third groove. The metal empty foil is welded to the metal foil layer 3 exposed from the third groove, so that the battery cell 200 and the encapsulation body 110 form an integral structure, thereby improving the performance of the battery cell 200 during collision or dropping. Moreover, during the charge and discharge process of the battery cell 200, the heat of the battery cell 200 can be quickly transferred to the encapsulation body 110 and dissipated to the outside through the encapsulation body 110, improving the overall safety and reliability of the battery cell 200. Specifically, in this embodiment, the glue layer 4 located on the inner wall of the accommodating cavity 113 has a third groove, and the internal metal foil layer 3 is exposed from the third groove. The outermost side of the battery cell body 210 has a metal empty foil. The battery cell 200 is, for example, a wound battery cell 200, and the metal empty 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 an aluminum-plastic film, that is, the metal foil layer 3 is an aluminum foil, and the metal empty foil is a single-sided empty aluminum foil or a double-sided empty aluminum foil, thereby improving the welding stability between the battery cell body 210 and the encapsulation body 110.

[0057] Based on the above embodiments, the metal empty foil is located on the side of the battery cell body 210 in the thickness direction of the soft package battery. In the thickness direction of the soft package battery, the projection of the metal empty foil is within the range of the third groove, that is, the metal foil layer 3 is located within the third groove. Thereby, not only can the flatness of the outside of the soft package battery be improved, but also the energy density of the battery can be improved. Specifically, if a part of the projection of the metal empty foil is outside the third groove, during welding, it is necessary to make the metal foil layer 3 protrude towards the metal empty foil so that the metal foil layer 3 extends out of the third groove to be welded to the metal empty foil. However, when the metal foil layer 3 protrudes towards the metal empty foil, a pit will be formed on the surface of the soft package battery. In this embodiment, the projection of the metal empty foil is within the range of the third groove. During welding, the metal empty foil can directly extend into the third groove to be welded to the metal foil layer 3 without making the metal foil layer 3 protrude, thereby making the surface of the soft package battery flatter. On the other hand, the metal empty foil is located within the third groove, which can reduce the internal space of the accommodating cavity 113 occupied by the metal empty foil, thereby improving the energy density of the soft package battery. Further, in some embodiments, in the thickness direction of the soft package battery, both sides of the battery cell body 210 have metal empty foils. Correspondingly, the inner wall of the encapsulation body 110 has two third grooves arranged oppositely, thereby further improving the energy density of the soft package battery and the stability during collision and dropping.

[0058] Referring to Figure 12 , Figure 12 For Figure 6An enlarged view of the middle E region. In some embodiments, the edge sealing structure 120 includes a second edge sealing structure 1202. For example, the second edge sealing structure 1202 is the top edge seal in a square 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 battery cell body 210, and the other end passes through the second edge sealing structure 1202. The insulating portion 222 is sleeved outside the tab portion 221, and the connecting portion 223 is sleeved outside the insulating portion 222 and welded to the metal sealing layer 122 of the second edge sealing structure 1202, thereby improving the connection strength between the tab 220 and the second edge sealing structure 1202, improving the safety of the soft-pack battery, and extending the service life of the soft-pack battery. Specifically, a stronger connection strength helps prevent electrolyte leakage caused by loosening or breakage between the tab 220 and the second edge sealing structure 1202, thereby enhancing the safety of the battery. Moreover, 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 service life of the battery. In addition, during the battery's cyclic use, the tight connection between the tab 220 and the second edge sealing structure 1202 can reduce loosening or damage caused by mechanical stress, help maintain the integrity of the battery structure, and extend the service life of the battery. Furthermore, a stronger connection strength means that the tab 220 can maintain a stable connection state during the battery cycle, thereby reducing performance degradation or failures caused by poor connection, and improving the cycle stability and reliability of the battery.

[0059] It should be noted that only a single-folded edge structure schematic diagram of the soft-pack battery is shown in the drawings, but it is not limited thereto. The soft-pack battery of the present application can also have a double-folded edge or a triple-folded edge structure, etc. Among them, the double-folded edge is formed by folding the edge sealing structure 120 itself to form two sub-folded edges, and the triple-folded edge is formed by folding the edge sealing structure 120 to form three sub-folded edges, and so on, which will not be listed one by one.

[0060] The present invention also provides a method for processing the edge sealing of a soft-pack battery. The edge-sealing structure 120 includes a first edge-sealing portion and a second edge-sealing portion distributed along its thickness direction. The specific steps of the processing method of the edge-sealing structure are as follows: Remove the molten glue layer 4 located in the first edge-sealing portion and the second edge-sealing portion, and retain the insulating layer 2 and the metal foil layer 3. The insulating layer 2 located in the first edge-sealing portion is used as the first insulating layer 121, the insulating layer 2 located in the second edge-sealing portion is used as the second insulating layer 123, the metal foil layer 3 located in the first edge-sealing portion is used as the first metal foil layer, and the metal foil layer 3 located in 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, so that the first edge-sealing portion and the second edge-sealing portion are hermetically connected. It can be known that the edge-sealing structure 120 processed by the edge-sealing structure processing method of this embodiment has a smaller thickness and higher sealing performance compared with the edge-sealing structure 120 formed by bonding with the molten glue layer 4 in the prior art.

[0061] 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 from the first window, and a second window is processed on the second insulating layer 123 to expose the second metal foil layer from the second window. Laser irradiates the first metal foil layer through the first window or irradiates the second metal foil layer through the second window 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 in the first window and the second window and completely covers the metal sealing layer 122. It can be known that in this embodiment, before welding, grooves are dug at the positions corresponding to welding on the first insulating layer 121 and the second insulating layer 123, and after welding, the insulating material is filled to repair the first insulating layer 121 and the second insulating layer 123, so as to reduce the influence of high temperature on the first insulating layer 121 and the second insulating layer 123 and improve the performance of the soft-pack battery.

[0062] The electrical device according to the second aspect embodiment of the present invention, the electrical device is, for example, a mobile phone, a watch, a tablet or a new energy vehicle, and the electrical device includes the soft-pack battery according to the first aspect 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 adhesively bonded in sequence along its thickness direction. The insulating layer 2 includes the first insulating layer 121 and the 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 prior art, the edge-sealing structure 120 in this embodiment removes the glue-melting layer 4, and the thickness of the edge-sealing structure 120 in this embodiment is relatively smaller than the thickness of the edge-sealing structure 120 in the prior art, 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 device in this embodiment.

[0063] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the gist of the present invention. In addition, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

Claims

1. A soft pack battery, characterized in that: include: A soft-pack shell is formed by processing a soft-pack film, wherein the soft-pack film comprises an insulating layer, a metal foil layer and a melt-adhesive layer bonded in sequence along its thickness direction, the soft-pack shell comprises a packaging body and a plurality of edge-sealing structures, the packaging body has a receiving cavity, the packaging body comprises two first walls arranged opposite to each other along the thickness direction of the soft-pack battery, and a second wall arranged between the two first walls and surrounding, each edge-sealing structure is connected to the second wall, the edge-sealing structure comprises a first insulating layer, a metal sealing layer and a second insulating layer bonded in sequence along its thickness direction, the first insulating layer and the second insulating layer are located at the outermost layer of the edge-sealing structure, the thickness of the first insulating layer and the second insulating layer are not greater than the thickness of the insulating layer, and the metal foil layer forms the metal sealing layer; The battery cell comprises a battery cell body and a tab, wherein the battery cell body is located in the accommodating cavity, and 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 the two 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 a rectangle, 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 the thickness 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, and 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 parts 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, and has a first groove on the side of the first edge sealing structure facing the packaging body, the metal sealing layer is exposed from the first groove, the packaging body has a second groove at the insulating layer corresponding to the first 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.

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 packaging body, the first insulating layer of the first edge sealing structure has a first window, and 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, and 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, and 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, 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.

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 includes a third insulating layer, a third metal foil layer, a first molten adhesive layer, a second molten adhesive layer, a fourth metal foil layer and a fourth insulating layer distributed in sequence along the thickness direction of the insulating segment. 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 molten adhesive layer includes the first molten adhesive layer and the second molten adhesive layer.

14. The soft pack battery according to claim 1, characterized in that: The outermost layer of the battery body has a hollow metal foil, the inner wall of the accommodating cavity has a third groove, the metal foil layer in the packaging 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, 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.

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 is welded to the metal sealing layer of the second edge sealing structure.

17. Electrical equipment, characterized in that: A soft-pack battery comprising the battery described in any one of claims 1 to 16.

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