Aluminum plastic film for battery packaging, packaging structure and battery

Abstract

The utility model discloses an aluminum-plastic film for battery packaging, a packaging structure and a battery, the aluminum-plastic film for battery packaging comprises a predetermined main body packaging part and a predetermined head packaging part, and the predetermined main body packaging part and the predetermined head packaging part respectively comprise an outer protective layer, a first bonding layer, a middle barrier layer, a second bonding layer and a hot melt adhesive layer which are stacked in sequence; the preset head packaging part further comprises an inner heat sealing layer which is arranged on the surface, deviating from the second bonding layer, of the hot melt adhesive layer. According to the aluminum-plastic film, the structure of the aluminum-plastic film serves as a carrier of the hot melt adhesive, the aluminum-plastic film and the hot melt adhesive are integrated, meanwhile, an inner hot melt adhesive layer is omitted on the aluminum-plastic film in a large area, part of space of the aluminum-plastic film and a conventional hot melt adhesive component is omitted, and the space utilization rate is increased; the hot melt adhesive pasting operation in the traditional battery preparation process can be omitted, the working procedure is simplified, and the manufacturing cost is reduced; when the hot melt adhesive is subsequently applied to packaging a battery cell, the large-area hot melt adhesive layer on the predetermined main body packaging part is bonded with the battery cell main body, so that the bonding area can be increased, and the reliability of the battery is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to an aluminum-plastic film for battery encapsulation, an encapsulation structure, and a battery. Background Technology

[0002] In battery manufacturing, hot melt adhesive is typically used to bond the aluminum-plastic film and the bare cell to reduce cell movement, thereby improving battery reliability and preventing failure. However, with the increasing market demand for cell capacity, on the one hand, space utilization needs to be further improved to increase energy density; on the other hand, increased capacity leads to increased cell weight, reduced battery reliability, and increased failure risk. To improve battery reliability, a simple and effective method is to increase the bonding area of ​​the hot melt adhesive to strengthen the fixation of the bare cell. However, when applying adhesive over a large area using the conventional method of first bonding the bare cell and then releasing the adhesive, the hot melt adhesive is prone to wrinkling. Therefore, narrow strips of hot melt adhesive are generally used for partial bonding, but this method increases operational complexity, manufacturing time costs, and reliability still needs improvement. Furthermore, current aluminum-plastic films generally consist of a heat-sealing layer, a barrier layer, and an outer protective layer, while conventional hot melt adhesives typically have a three-layer structure, including an intermediate base film and adhesive layers and hot melt adhesive layers located on both sides of the intermediate base film. Using these to bond and fix the aluminum-plastic film and the bare cell reduces the battery's space utilization. Utility Model Content

[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 proposes an aluminum-plastic film for battery encapsulation, an encapsulation structure, and a battery.

[0004] In a first aspect, this utility model provides an aluminum-plastic film for battery encapsulation, comprising a predetermined main body encapsulation portion and a predetermined head encapsulation portion. Both the predetermined main body encapsulation portion and the predetermined head encapsulation portion comprise an outer protective layer, a first adhesive layer, an intermediate barrier layer, a second adhesive layer, and a hot melt adhesive layer stacked sequentially. The predetermined head encapsulation portion further comprises an inner heat-sealing layer, which is disposed on the surface of the hot melt adhesive layer away from the second adhesive layer.

[0005] The aluminum-plastic film for battery encapsulation described above can be used to construct encapsulation structures to encapsulate battery cells or directly for encapsulating battery cells. Furthermore, when encapsulating a battery cell, a predetermined main body encapsulation portion is configured to correspond to the encapsulated battery cell main body, a predetermined head encapsulation portion is configured to correspond to the encapsulated battery cell head, and the inner heat-sealing layer on the aluminum-plastic film faces the battery cell.

[0006] According to the embodiments of this utility model, the aluminum-plastic film for battery encapsulation has at least the following beneficial effects: The aluminum-plastic film for battery encapsulation uses its own structure as a carrier for hot melt adhesive. Specifically, an adhesive layer and a hot melt adhesive layer are provided on the side of the intermediate barrier layer facing away from the outer protective layer, integrating the aluminum-plastic film and the hot melt adhesive. Simultaneously, the inner heat-sealing layer is largely eliminated on the aluminum-plastic film, saving space for some aluminum-plastic film and conventional hot melt adhesive components, thus improving space utilization. Furthermore, integrating the aluminum-plastic film and the hot melt adhesive eliminates the need for hot melt adhesive application in traditional battery manufacturing processes, simplifying the process and reducing manufacturing costs. Additionally, when this aluminum-plastic film for battery encapsulation is subsequently used to encapsulate battery cells, a large area of ​​hot melt adhesive layer on the predetermined main encapsulation part adheres to the main body of the battery cell, increasing the bonding area between the aluminum-plastic film and the battery cell, improving battery reliability, and reducing the risk of failure.

[0007] In some embodiments of this utility model, the aluminum-plastic film for battery encapsulation further includes a predetermined corner encapsulation portion, which is disposed between the predetermined head encapsulation portion and the predetermined body encapsulation portion. The predetermined corner encapsulation portion includes an outer protective layer, a first adhesive layer, an intermediate barrier layer, a second adhesive layer, a hot melt adhesive layer, and an inner heat-sealing layer stacked sequentially. The predetermined corner encapsulation portion is configured to encapsulate the connection corner area between the battery cell body and the battery cell head, and corresponds to the bending position of the encapsulated tab. Based on the setting of the inner heat-sealing layer on the predetermined corner encapsulation portion, the insulation layer thickness is large, which can reduce the risk of short circuit due to damage to the encapsulation structure corresponding to the tab bending position and improve battery reliability.

[0008] In some embodiments of this utility model, the predetermined main body packaging portion includes a predetermined bottom packaging portion and a predetermined sidewall packaging portion. The predetermined sidewall packaging portion includes a first predetermined sidewall packaging portion and a second predetermined sidewall packaging portion. The first predetermined sidewall packaging portion is configured to package a sidewall on the main body of the battery cell perpendicular to the thickness direction, and the second predetermined sidewall packaging portion is configured to package a sidewall on the main body of the battery cell parallel to the thickness direction. The edge of the second predetermined sidewall packaging portion is provided with a predetermined sealing portion, and the predetermined sealing portion further includes an inner heat-sealing layer. By providing an inner heat-sealing layer on the predetermined sealed packaging portion, effective sealing is achieved, and the stability of the seal is improved.

[0009] In some embodiments of this utility model, the predetermined corner encapsulation portion has the same thickness as the predetermined head encapsulation portion and is greater than the thickness of the first predetermined sidewall encapsulation portion. By controlling the thickness of the predetermined head encapsulation portion and the predetermined corner encapsulation portion to be greater than the thickness of the first predetermined sidewall encapsulation portion on the predetermined main body encapsulation portion, the reliability of the battery constructed by applying aluminum-plastic film to encapsulate the battery cell can be further improved, while also facilitating battery thinning and improving space utilization.

[0010] In some embodiments of this utility model, the predetermined sealing portion has the same thickness as the predetermined corner encapsulation portion and the predetermined head encapsulation portion, and is greater than the thickness of the first predetermined sidewall encapsulation portion.

[0011] In some embodiments of this utility model, the material of the outer protective layer is selected from either nylon or PET.

[0012] In some embodiments of this utility model, the barrier layer is a metal aluminum layer.

[0013] In some embodiments of this utility model, the inner heat-sealing layer is a cast polypropylene film layer.

[0014] In some embodiments of this utility model, the thickness of the inner heat-sealing layer is 10um to 150um.

[0015] In a second aspect, this utility model provides an encapsulation structure constructed from any of the aforementioned aluminum-plastic films for battery encapsulation; the encapsulation structure includes an encapsulation body and a head encapsulation portion, the encapsulation body being constructed from the predetermined body encapsulation portion, and the head encapsulation portion being constructed from the predetermined head encapsulation portion; the encapsulation body has at least an opening at its head, and the head encapsulation portion is disposed at the head opening end of the encapsulation body and is configured to block the head opening.

[0016] In some embodiments of this utility model, the packaging structure is constructed from any of the aforementioned aluminum-plastic film for battery packaging, including a predetermined corner packaging portion; the packaging structure further includes a corner packaging portion, which is constructed from the predetermined corner packaging portion; the head packaging portion is connected to the packaging body through the corner packaging portion.

[0017] A third aspect of this utility model provides a battery comprising a cell and a casing, wherein the cell is encapsulated within the casing; the cell comprises a cell body and a cell head.

[0018] The encapsulation housing adopts any of the aforementioned encapsulation structures, the encapsulation body encapsulates the cell body, and the head encapsulation part encapsulates the cell head.

[0019] Alternatively, the encapsulation housing may be constructed from any of the aforementioned aluminum-plastic film for battery encapsulation, with the predetermined main body encapsulation portion corresponding to encapsulating the main body of the battery cell and the predetermined head encapsulation portion corresponding to encapsulating the head of the battery cell.

[0020] In some embodiments of this utility model, the battery cell includes a positive electrode, a negative electrode, a separator, and a tab. The separator is sandwiched between the positive electrode and the negative electrode. The tab is located at the head of the battery cell and includes an exposed tab and a bent connection portion. The bent connection portion is located inside the encapsulation housing, with one end connected to the positive electrode and / or the negative electrode, and the other end connected to the exposed tab. The exposed tab extends from the inside of the encapsulation housing to the outside of the encapsulation housing.

[0021] In some embodiments of this utility model, one end of the bent connecting portion is connected to the negative electrode plate, and the other end is connected to the exposed electrode tab; and the outermost layer of the battery cell is the positive electrode plate;

[0022] The encapsulation housing adopts any of the aforementioned encapsulation structures including a corner encapsulation portion. The encapsulation structure is constructed from any of the aforementioned aluminum-plastic film for battery encapsulation including a predetermined corner encapsulation portion. Along the length direction of the cell, the length by which the edge of the negative electrode sheet on the head of the cell extends beyond the edge of the positive electrode sheet is J. The distance between the negative electrode sheet and the head encapsulation portion is A. The distance between the bent connection portion and the head encapsulation portion is B. The distance between the end of the corner encapsulation portion facing away from the head encapsulation portion and the head encapsulation portion is C. C satisfies the following formula: B+H≤C≤A+J, where A, B, and J are all greater than 0, and 0.1mm≤H≤1mm.

[0023] Alternatively, the encapsulation housing is constructed from any of the aforementioned aluminum-plastic film for battery encapsulation, including a predetermined corner encapsulation portion; and along the length direction of the cell, the length by which the edge of the negative electrode sheet on the head of the cell extends beyond the edge of the positive electrode sheet is J, the distance between the negative electrode sheet and the head encapsulation portion is A, the distance between the bent connection portion and the predetermined head encapsulation portion is B, and the distance between the end of the predetermined corner encapsulation portion facing away from the predetermined head encapsulation portion and the predetermined head encapsulation portion is C, where C satisfies the following formula: B+H≤C≤A+J, where A, B, and J are all greater than 0, and 0.1mm≤H≤1mm.

[0024] In some embodiments of this utility model, the tab is covered with an insulating protective adhesive layer; the thickness of the insulating protective adhesive layer is ≥75μm, and / or the melting point of the insulating protective adhesive layer is ≥135℃. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0026] Figure 1 This is a schematic diagram of the structure of an embodiment of the aluminum-plastic film for battery encapsulation according to this utility model;

[0027] Figure 2 For along Figure 1 Sectional view of AA;

[0028] Figure 3 For along Figure 1 Sectional view of BB;

[0029] Figure 4 This is a schematic diagram of one embodiment of the packaging structure of this utility model;

[0030] Figure 5 for Figure 4 Schematic diagram of the structure of region M in the middle;

[0031] Figure 6 for Figure 4 A schematic diagram of the encapsulation structure from another perspective;

[0032] Figure 7 This is a schematic diagram of the structure of an embodiment of the battery of this utility model;

[0033] Figure 8 for Figure 7 A schematic diagram of the battery from another perspective;

[0034] Figure 9 This is a schematic diagram of the structure of an embodiment of the battery of this utility model. Detailed Implementation

[0035] The following will clearly and completely describe the concept and technical effects of this application in conjunction with embodiments, so as to fully understand the purpose, features and effects of this application. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are all within the scope of protection of this application.

[0036] The embodiments of this application are described in detail below. The described embodiments are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0037] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0038] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0039] This utility model proposes an aluminum-plastic film for battery encapsulation, see reference. Figures 1 to 3 The aluminum-plastic film for battery encapsulation includes a predetermined main body encapsulation portion 12 and a predetermined head encapsulation portion 11. Both the predetermined main body encapsulation portion 12 and the predetermined head encapsulation portion 11 include an outer protective layer 111, a first adhesive layer 112, an intermediate barrier layer 113, a second adhesive layer 114, and a hot melt adhesive layer 115, which are stacked in sequence (i.e., arranged in sequence along the thickness direction). The predetermined head encapsulation portion 11 also includes an inner heat-sealing layer 116, which is disposed on the surface of the hot melt adhesive layer 115 of the predetermined head encapsulation portion 11, away from the surface of the second adhesive layer 114.

[0040] The aluminum-plastic film for battery encapsulation mentioned above can be used to encapsulate battery cells. A battery cell generally includes a battery cell body and a battery cell head. The battery cell head is located at one end of the battery cell body along the length direction. The battery cell head is usually the tab lead-out end. The predetermined body encapsulation part 12 in the aluminum-plastic film is configured to encapsulate the battery cell body when encapsulating the battery cell, and the predetermined head encapsulation part 11 is configured to encapsulate the battery cell head when encapsulating the battery cell.

[0041] The outer protective layer 111 provides external protection, specifically protecting the intermediate barrier layer 113 from scratches. The outer protective layer 111 can be made of either nylon or PET.

[0042] The first adhesive layer 112 serves to bond the outer protective layer 111 and the intermediate barrier layer 113. It is generally made of an insulating material that releases its adhesiveness at room temperature. For example, the material of the first adhesive layer 112 can be one or more of epoxy resin, polyethylene, polypropylene, and polyvinyl acetate, but is not limited to these materials. The thickness of the first adhesive layer 112 can be controlled between 0.5 μm and 20 μm, and further, the thickness of the first adhesive layer 112 is between 2 μm and 3 μm.

[0043] The intermediate barrier layer 113 mainly serves to block moisture, preventing moisture from entering the battery cell during encapsulation. The intermediate barrier layer 113 can be made of a water-resistant material with a certain dent-proofing ability. For example, the intermediate barrier layer 113 can be a metal aluminum layer or a stainless steel layer, with metal aluminum layer being preferred.

[0044] Both the second adhesive layer 114 and the hot melt adhesive layer 115 are insulating layers. The second adhesive layer 114 generally releases its tack at room temperature and has strong adhesive properties. The hot melt adhesive layer 115 is solid at room temperature and releases its tack after being heated and melted; its tack release temperature (or melting temperature) can be between 50°C and 90°C. The second adhesive layer 114 bonds the intermediate barrier layer 113 and the hot melt adhesive layer 115 at room temperature. The hot melt adhesive layer 115 can be heated and melted to bond other components under pressure. For example, the hot melt adhesive layer 115 on the predetermined head encapsulation portion 11 bonds the inner heat-sealing layer 116, and during the encapsulation of the battery cell, the innermost hot melt adhesive layer 115 on the predetermined main body encapsulation portion 12 is heated and melted to bond the battery cell body under pressure. The applied pressure can be between 0.1 MPa and 5 MPa.

[0045] The second adhesive layer 114 and the hot melt adhesive layer 115 can be the same as the adhesive layer and hot melt adhesive layer in conventional hot melt adhesives. Specifically, the hot melt adhesive layer 115 can be a corrosion-resistant hot melt adhesive layer with good resistance to electrolyte corrosion; the second adhesive layer 114 can also be a corrosion-resistant adhesive layer. The second adhesive layer 114 and the hot melt adhesive layer 115 can use similar components, such as one or more of styrene-isoprene copolymers and butadiene-styrene copolymers, but are not limited to these materials.

[0046] In the above-mentioned aluminum-plastic film for battery encapsulation, a second adhesive layer 114 and a hot melt adhesive layer 115 are sequentially disposed on the surface of the intermediate barrier layer 113 facing away from the first adhesive layer 112. Using the aluminum-plastic film's own structure as a carrier, the aluminum-plastic film and hot melt adhesive are integrated. Compared to the traditional three-layer hot melt adhesive used in battery encapsulation to bond the conventional aluminum-plastic film and battery cell, this aluminum-plastic film for battery encapsulation eliminates the need for hot melt adhesive bonding in the traditional battery manufacturing process, simplifying production steps and reducing manufacturing costs. Furthermore, by eliminating the intermediate base film of traditional hot melt adhesive, space utilization is improved, and the energy density of the battery cell is increased. Simultaneously, the large-area hot melt adhesive layer 115 on the innermost part of the predetermined main encapsulation section 12 of the aluminum-plastic film for battery encapsulation bonds the battery cell body during encapsulation, increasing the bonding area between the aluminum-plastic film and the battery cell, strengthening cell fixation, improving battery reliability, and reducing the risk of failure.

[0047] In addition, during the research and development process, the inventors also considered that if the intermediate base layer of the traditional hot melt adhesive is simply eliminated and the conventional aluminum-plastic film and battery cell are bonded with a hot melt adhesive containing an adhesive layer and a hot melt adhesive layer, the thickness of the final battery product can be reduced. However, the manufacturing process usually requires other carrier films to first bond the adhesive layer and the hot melt adhesive layer, and then remove the carrier film, which will increase the manufacturing cost and complexity. The aluminum-plastic film for battery encapsulation integrates the aluminum-plastic film and the hot melt adhesive, which can eliminate the use of an additional carrier film and traditional adhesive application operations, simplify the process, save costs, and improve safety and reliability, thus having a greater advantage.

[0048] Furthermore, compared to the overall film layer layout of the inner heat-sealing layer on traditional aluminum-plastic film, the aluminum-plastic film for battery packaging has a large area of ​​the inner heat-sealing layer 116 eliminated on the predetermined main body packaging part 12 based on the setting of the second adhesive layer 114 and the hot melt adhesive layer 115, saving the space of the inner heat-sealing layer layout in this area of ​​traditional aluminum-plastic film, which can improve space utilization.

[0049] The inner heat-sealing layer 116 can be used for high-temperature fusion sealing of the battery cell. The inner heat-sealing layer 116 can be made of cast polypropylene (CPP) film. In addition, the thickness of the inner heat-sealing layer 116 can be controlled between 10μm and 150μm, specifically any value or a range formed by any combination of 10μm, 20μm, 35μm, 50μm, 60μm, 75μm, 80μm, 100μm, 110μm, 125μm, 140μm, and 150μm.

[0050] The predetermined main body encapsulation portion 12 and the predetermined head encapsulation portion 11 are generally arranged at the same horizontal level. The material and thickness of the outer protective layer 111, the first adhesive layer 112, the intermediate barrier layer 113, the second adhesive layer 114, and the hot melt adhesive layer 115 on the predetermined main body encapsulation portion 12 can be the same as or different from the material and thickness of the outer protective layer 111, the first adhesive layer 112, the intermediate barrier layer 113, the second adhesive layer 114, and the hot melt adhesive layer 115 on the predetermined head encapsulation portion 11. Specifically, it can be designed such that the material and thickness of each layer above the predetermined main body encapsulation portion 12 are all the same as the material and thickness of each layer above the predetermined head encapsulation portion 11; or, the material of each layer is the same but the thickness is different; or, the thickness of each layer is the same but the material is different; or, the material and thickness of each layer are all different.

[0051] In this embodiment, the predetermined main body encapsulation part 12 is composed of five layers stacked in sequence (i.e., arranged in sequence along the thickness direction): an outer protective layer 111, a first adhesive layer 112, an intermediate barrier layer 113, a second adhesive layer 114, and a hot melt adhesive layer 115. The predetermined head encapsulation part 11 is composed of an outer protective layer 111, a first adhesive layer 112, an intermediate barrier layer 113, a second adhesive layer 114, a hot melt adhesive layer 115, and an inner heat-sealing layer 116 stacked in sequence. The materials and thicknesses of the outer protective layer 111, the first adhesive layer 112, the intermediate barrier layer 113, the second adhesive layer 114, and the hot melt adhesive layer 115 on the predetermined main body encapsulation part 12 and the predetermined head encapsulation part 11 are the same.

[0052] In addition, the aluminum-plastic film for battery encapsulation in this embodiment also includes a predetermined corner encapsulation part 13, which is disposed between the predetermined head encapsulation part 11 and the predetermined main body encapsulation part 12. The predetermined head encapsulation part 13 includes an outer protective layer 111, a first adhesive layer 112, an intermediate barrier layer 113, a second adhesive layer 114, a hot melt adhesive layer 115, and an inner heat-sealing layer 116 stacked in sequence.

[0053] There is generally a corner area between the cell body and the cell head on the battery cell, and a predetermined corner encapsulation part 13 is configured to encapsulate this corner area. Based on the above-mentioned layer structure of the predetermined corner encapsulation part 13, the risk of damage caused by transportation, use, or accidental drops can be reduced, thereby improving battery reliability.

[0054] The arrangement of the outer protective layer 111, first adhesive layer 112, intermediate barrier layer 113, second adhesive layer 114, hot melt adhesive layer 115, and inner heat-sealing layer 116 on the predetermined corner encapsulation portion 13 can be similar to the arrangement of the corresponding layers on the predetermined head encapsulation portion 11. Specifically, the material and thickness of each layer above the predetermined corner encapsulation portion 13 can be the same as or different from the material and thickness of each layer on the predetermined head encapsulation portion 11. In this embodiment, the material and thickness of each layer above the predetermined corner encapsulation portion 13 are the same as those of each layer on the predetermined head encapsulation portion 11. In other embodiments, the material of each layer on the predetermined corner encapsulation portion 13 and the predetermined head encapsulation portion 11 can be the same, but the thickness is different; or the thickness of each layer can be the same, but the material is different; or the material and thickness of each layer can be different.

[0055] In this embodiment, the aluminum-plastic film for battery encapsulation specifically includes, in its layer structure, an outer protective layer 111, a first adhesive layer 112, an intermediate barrier layer 113, a second adhesive layer 114, and a hot melt adhesive layer 115 stacked sequentially. According to the encapsulation area division, the aluminum-plastic film for battery encapsulation includes a predetermined main encapsulation part 12, a predetermined head encapsulation part 11, and a predetermined corner encapsulation part 13 disposed between the two. The predetermined head encapsulation part 11 and the predetermined corner encapsulation part 13 also include an inner heat-sealing layer 116 in the layer structure. The inner heat-sealing layer 116 is disposed on the surface of the hot melt adhesive layer 115 away from the surface of the second adhesive layer 114.

[0056] The battery cell body generally includes a bottom and a sidewall, with the bottom and head of the battery cell disposed opposite each other. Accordingly, in some embodiments, the predetermined body encapsulation portion 12 may be designed to include a predetermined bottom encapsulation portion 121 and a predetermined sidewall encapsulation portion 122, wherein the predetermined bottom encapsulation portion 121 is configured to encapsulate the bottom of the battery cell body, and the predetermined sidewall encapsulation portion 122 is configured to encapsulate the sidewall of the battery cell body. In some embodiments, the predetermined bottom encapsulation portion 121 also includes an inner heat-sealing layer 116, the arrangement of which may be similar to the inner heat-sealing layer 116 on the predetermined head encapsulation portion 11, and will not be described further. Of course, in other embodiments, the predetermined bottom encapsulation portion 121 may not include the inner heat-sealing layer 116.

[0057] Additionally, the sidewall of the battery cell body may include a first sidewall perpendicular to the thickness direction of the battery cell body and a second sidewall parallel to the thickness direction of the battery cell body. In some embodiments, the predetermined sidewall encapsulation portion 122 may include a first predetermined sidewall encapsulation portion 1221 and a second predetermined sidewall encapsulation portion 1222. The first predetermined sidewall encapsulation portion 1221 is configured to encapsulate the first sidewall (i.e., the sidewall on the battery cell body perpendicular to the thickness direction), and the second predetermined sidewall encapsulation portion 1222 is configured to encapsulate the second sidewall (i.e., the sidewall on the battery cell body parallel to the thickness direction). The edge of the second predetermined sidewall encapsulation portion 1222 is provided with a predetermined sealing portion 1223, and the predetermined sealing portion 1223 further includes an inner heat-sealing layer 116, i.e., the first predetermined sidewall. Both the encapsulation portion 1221 and the second predetermined sidewall encapsulation portion 1222 include an outer protective layer 111, a first adhesive layer 112, an intermediate barrier layer 113, a second adhesive layer 114, and a hot melt adhesive layer 115, arranged sequentially. The predetermined sealing portion 1223 at the edge of the second predetermined sidewall encapsulation portion 1222 also includes an inner heat-sealing layer 116. When encapsulating the battery, side sealing can be achieved through the adhesion and sealing of the predetermined sealing portion 1223. Providing the inner heat-sealing layer 116 on the predetermined sealing portion 1223 facilitates effective sealing and improves sealing stability. In some embodiments, the entire second predetermined sidewall encapsulation portion 1222 may also include the inner heat-sealing layer 116 to improve cell safety performance.

[0058] In some embodiments, the predetermined corner encapsulation portion 13 has the same thickness as the predetermined head encapsulation portion 11, and is greater than the thickness of the first predetermined sidewall encapsulation portion 1221. This further improves the reliability of the battery constructed using aluminum-plastic film to encapsulate the battery cell, reduces the risk of the predetermined corner encapsulation portion 13 and the predetermined head encapsulation portion 11 being punctured during transportation or accidental drops, and facilitates battery thinning and improved space utilization. Furthermore, the thickness T of the first predetermined sidewall encapsulation portion 1221 on the predetermined main body encapsulation portion 12 can be controlled to be 20µm to 180µm, and the thickness T1 of the predetermined head encapsulation portion 11 can be controlled to be 30µm to 200µm.

[0059] In this embodiment, the predetermined sealing portion 1223 has the same thickness as the predetermined corner encapsulation portion 13 and the predetermined head encapsulation portion 11, and is greater than the thickness of the first predetermined sidewall encapsulation portion 1221. Furthermore, the thickness and layer configuration of the area on the second predetermined sidewall encapsulation portion 1222, excluding the predetermined sealing portion 1223, can be controlled to be the same as the thickness and layer configuration of the first predetermined sidewall encapsulation portion 1221.

[0060] Additionally, there is typically a corner area between the bottom of the battery cell body and the sidewall of the battery cell body. In some embodiments, the predetermined body encapsulation portion 12 may also include a predetermined body corner encapsulation portion configured to encapsulate the corner area between the bottom of the battery cell body and the sidewall of the battery cell body. The arrangement of the predetermined body corner encapsulation portion may be similar to the predetermined corner encapsulation portion 13 between the predetermined body encapsulation portion 12 and the predetermined head encapsulation portion 11.

[0061] The aluminum-plastic film for battery encapsulation described above can be used to construct battery encapsulation structures. Specifically, the aluminum-plastic film can be used to construct the encapsulation structure first, and then used to encapsulate battery cells; or, it can be used directly to encapsulate battery cells. At least one end of the predetermined main encapsulation portion 12 on the aluminum-plastic film for battery encapsulation has a predetermined head encapsulation portion 11. For example, it can be designed so that one end of the predetermined main encapsulation portion 12 has a predetermined head encapsulation portion 11 or a combination of a predetermined head encapsulation portion 11 and a predetermined corner encapsulation portion 13. Then, two aluminum-plastic films can be used together to seal the sides and bottom edges to construct an encapsulation structure or encapsulate a battery cell; or, it can be designed so that both ends of the predetermined main encapsulation portion 12 have predetermined head encapsulation portions 11 or a combination of a predetermined head encapsulation portion 11 and a predetermined corner encapsulation portion 13. Then, it can be folded along the middle region of the predetermined main encapsulation portion and the edges sealed to construct an encapsulation structure or encapsulate a battery cell. In this embodiment, both ends of the predetermined main encapsulation portion 12 have a combination of a predetermined head encapsulation portion 11 and a predetermined corner encapsulation portion 13. Alternatively, a single structure can be assembled into a packaging module, and several similar packaging modules can be constructed on an aluminum-plastic film for packaging batteries.

[0062] This utility model also proposes a packaging structure, see reference. Figures 4 to 6 , Figure 4 A schematic diagram of an embodiment of the packaging structure of this utility model is shown, specifically illustrating the internal structure along the length direction. Figure 5 It shows Figure 4 A structural diagram of region M in the middle. Figure 6 It shows Figure 4 The diagram shows a structural schematic of the packaging structure from another perspective (i.e., in the width direction). Wherein, Figure 4 and Figure 6 This is a simplified schematic diagram of the layer structure of the aluminum-plastic film that forms the encapsulation structure. Figure 5 The simplified layer structure is further illustrated.

[0063] The packaging structure consists of Figure 1 The battery encapsulation shown is constructed from an aluminum-plastic film, and includes an encapsulation body 22 and a head encapsulation part 21. The encapsulation body 22 is made of... Figure 1 The battery encapsulation body 22 is constructed from a predetermined main body encapsulation portion 12 of an aluminum-plastic film, and the head encapsulation portion 21 is constructed from a predetermined head encapsulation portion 11. Specifically, the encapsulation body 22 extends along... Figure 1 The battery encapsulation aluminum-plastic film shown is bent in the middle region (i.e., at the junction of the predetermined bottom encapsulation portion 121 and the predetermined sidewall encapsulation portion 122), and bent along the junction of the first predetermined sidewall encapsulation portion 1221 and the second predetermined sidewall encapsulation portion 1222. Then, the predetermined sealing portion 1223 of the edge of the second predetermined sidewall encapsulation portion 1222 is adhered and sealed to form the encapsulation body 22. The encapsulation body 22 has at least an opening at its head, and a head encapsulation portion 21 is provided at the head opening end of the encapsulation body 22 and is configured to seal the head opening.

[0064] Specifically, in this embodiment, the encapsulation body 22 has a receiving cavity 24 and only the head has an opening 25 to accommodate the battery cell through the receiving cavity 24; the head encapsulation part 21 is disposed at the head opening end of the encapsulation body 22 and is configured to block the opening 25 to seal the head of the battery cell. When this encapsulation structure is used to encapsulate a battery, the battery cell is placed inside the receiving cavity 24 of the encapsulation body 22, and the tab end on the battery cell is generally disposed at the head opening end of the encapsulation body 22 and sealed by the head encapsulation part 21 of the encapsulation structure to achieve battery encapsulation.

[0065] The encapsulation body 22 specifically includes a bottom encapsulation portion 221 and a sidewall encapsulation portion 222. The bottom encapsulation portion 221 and the sidewall encapsulation portion 222 enclose a receiving cavity 24 and have an opening 25 at the head. The bottom encapsulation portion 221 is constructed from a predetermined bottom encapsulation portion 121, and the sidewall encapsulation portion 222 is constructed from a predetermined sidewall encapsulation portion 1222. The sidewall encapsulation portion 2222 includes a first sidewall encapsulation portion 2221 and a second sidewall encapsulation portion 2222. The first sidewall encapsulation portion 2221 is constructed from a first predetermined sidewall encapsulation portion 1221 and is configured as a sidewall on the encapsulation cell body perpendicular to the thickness direction. The second sidewall encapsulation portion 2222 is constructed from a second predetermined sidewall encapsulation portion 1222 and has a sealing portion 2223 formed by a predetermined sealing portion 1223 on the second predetermined sidewall encapsulation portion 1222. The second sidewall encapsulation portion 2222 is configured as a sidewall on the encapsulation cell body parallel to the thickness direction.

[0066] In some embodiments, the encapsulation body 22 may be designed with openings on both its sides and head, so that when encapsulating the battery, the encapsulation body 22 can cover the battery cell and seal the side and head openings to achieve battery encapsulation. For example, in some embodiments, Figure 6 The predetermined sealing portion 1223 on the second predetermined sidewall encapsulation portion 1222, which forms the second sidewall encapsulation portion, is not properly sealed, thus forming an opening on the side of the encapsulation body 22. When encapsulating the battery, the encapsulation body 22 is used to cover the battery cell, and then the side and head openings are sealed.

[0067] The aluminum-plastic film used for battery encapsulation in this embodiment also includes a predetermined corner encapsulation part 13. Correspondingly, the encapsulation structure in this embodiment also includes a corner encapsulation part 23. The corner encapsulation part 23 is constructed from the predetermined corner encapsulation part 13 of the aluminum-plastic film. The corner encapsulation part 23 is disposed between the encapsulation body 22 and the head encapsulation part 21, and the head encapsulation part 21 is connected to the encapsulation body 22 through the corner encapsulation part 23.

[0068] In other embodiments, other aluminum-plastic films for battery encapsulation described above can also be used to construct encapsulation structures in a similar manner, and the constructed encapsulation structures can be further applied to battery encapsulation.

[0069] This utility model also proposes a battery, see [link to relevant documentation] Figure 7 and Figure 8 It includes a battery cell and a packaging shell, with the battery cell encapsulated within the packaging shell; the battery cell includes a battery cell body 31 and a battery cell head 32. In this embodiment, the packaging shell specifically adopts... Figures 4-6 The packaging structure shown is as follows: Figure 7 The viewpoint of the battery shown corresponds to Figure 4 The perspective of the packaging structure shown. Figure 8 The viewpoint of the battery shown corresponds to Figure 6 From the perspective of the packaging structure shown, the packaging body 22 corresponds to the packaged cell body 31, and the head packaging portion 21 corresponds to the packaged cell head 32. Of course, in other embodiments, the packaging shell may also adopt other packaging structures as described above, and the cell may be packaged in a similar manner.

[0070] According to the regional division, the battery cell includes a battery cell body 31 and a battery cell head 32, with the battery cell head 32 located at one end of the battery cell body 31 along its length. In this embodiment, the battery cell body 31 includes a battery cell body bottom 311 and a battery cell body sidewall 312, with the battery cell body bottom 311 located at the other end of the battery cell body 31 along its length, opposite to the battery cell head 32. In the packaging structure, the bottom packaging portion 221 of the packaging body 22 encapsulates the battery cell body bottom 311, and the sidewall packaging portion 222 encapsulates the battery cell body sidewall 312. Further, the battery cell body sidewall 312 includes a first sidewall 3121 perpendicular to the thickness direction of the battery cell body 31 and a second sidewall 3122 parallel to the thickness direction of the battery cell body 31. The first sidewall packaging portion 2221 on the packaging body 22 encapsulates the first sidewall 3121, and the second sidewall packaging portion 2222 encapsulates the second sidewall 3122.

[0071] According to the cell structure, the cell may include a positive electrode 33, a negative electrode 34, a separator 35, and a tab 36. The separator 35 is sandwiched between the positive electrode 33 and the negative electrode 34, and the tab 36 is connected to the positive electrode 33 and / or the negative electrode 34. The cell may specifically be a laminated cell, a wound cell, etc.

[0072] The positive electrode 33 generally includes a positive current collector and a positive active material layer disposed on the surface of the positive current collector; the negative electrode 34 generally includes a negative current collector and a negative active material layer disposed on the surface of the negative current collector. In some embodiments, the edge of the negative electrode 34 may be designed to extend beyond the edge of the positive electrode 33 along the length direction of the cell, and / or the edge of the separator 35 may extend beyond the edge of the negative electrode 34.

[0073] Tab 36 is generally located at the head of the cell. Tab 36 and electrode sheet can be connected by flexible conductive connectors (such as foil tabs). Using flexible conductive connectors, based on their flexible and bendable characteristics, can facilitate flexible assembly and improve structural safety.

[0074] Specifically, the tab 36 can be designed to include an exposed tab 361 and a bent connection portion 362; the bent connection portion 362 is disposed within the receiving cavity 24 of the packaging structure, one end of which is connected to the electrode plate, and the other end is connected to the exposed tab 361; the exposed tab 361 extends from the inside of the packaging housing to the outside of the packaging housing. Further, the exposed tab 361 can be designed to extend from the inside of the packaging housing to the outside of the packaging housing along the length direction of the battery cell.

[0075] In this embodiment, one end of the bent connection portion 362 on the tab 36 is connected to the negative electrode 34 via a foil tab, and the other end is connected to the exposed tab 361, thus the tab is the negative electrode tab; in addition, the outermost layer of the battery cell is the positive electrode 33.

[0076] Of course, in other embodiments, one end of the bent connection portion 362 on the tab 36 can be connected to the positive electrode 33 via a foil tab, and the other end can be connected to the exposed tab 361, thus making the tab a positive electrode tab. In addition, the outermost layer of the battery cell can also be a negative electrode 34 or a separator 35.

[0077] The packaging structure used in this embodiment includes a corner packaging section 23, and the packaging structure is constructed from a battery packaging section including a predetermined corner packaging section 13; the corner packaging section 23 encapsulates the corner area before the cell body 31 and the cell head 32.

[0078] Considering that the second adhesive layer and hot melt adhesive layer in the encapsulation structure are usually thin, although they are insulating, they have a certain risk of breakage, especially after the second adhesive layer 114 and hot melt adhesive layer 115 are hot melted and during reliability testing, if an inner encapsulation layer is not provided, and the second adhesive layer 114 and hot melt adhesive layer 115 are damaged, the following problems exist: When the damaged area is large, the intermediate barrier layer 113 of the aluminum-plastic film on the encapsulation structure and the outer electrode of the battery cell are easily brought into contact and become charged (such as being positively charged when in contact with the outer positive electrode 33 of the battery cell in this embodiment), and the tab 36 and the intermediate barrier layer 113 are prone to short circuit; when the damaged area is small, the intermediate barrier layer 113 may not necessarily become charged, but there are electron channels and ion channels between the tab 36 and the intermediate barrier layer 113, which are prone to corrosion. To address this, the inner heat-sealing layer 116 on the aluminum-plastic film of the encapsulation head section 21 and the corner encapsulation section 23 of the encapsulation structure is provided. When encapsulating the battery, there is an inner encapsulation layer 116 corresponding to the tab area, which has an insulating effect. This can prevent the tab 36 and the intermediate barrier layer 113 from contacting and forming an electronic channel, reducing the risk of short circuit due to damage to the tab area. Even if the main body area is damaged, the overall risk to the battery cell is not significant.

[0079] Furthermore, in this embodiment, along the length direction of the cell, the length by which the edge of the negative electrode 34 on the cell head 32 extends beyond the edge of the positive electrode 33 is J, the distance between the negative electrode 34 and the head encapsulation portion 21 on the encapsulation structure is A, the distance between the bent connection portion 362 of the tab 36 and the head encapsulation portion 21 is B, and the distance between the end of the corner encapsulation portion 23 facing away from the head encapsulation portion 21 and the head encapsulation portion 21 is C. C satisfies the following formula: B+H≤C≤A+J; where A, B, and J are all greater than 0, and 0.1mm≤H≤1mm.

[0080] H considers the risk caused by cell shaking during reliability testing; the larger H is, the safer it is. The value of C mainly considers energy density gain and short circuit risk. When C is too large, the inner heat-sealing layer 116 on the aluminum-plastic film that forms the encapsulation structure overlaps with the cell body 31, affecting the cell thickness and reducing the cell's energy density gain. When C is too small, the inner heat-sealing layer 116 on the aluminum-plastic film that forms the encapsulation structure does not cover the bent connection 362 on the tab 36. During reliability testing, as the cell shakes, the tab 36 will rub against the hot melt adhesive layer 115 and even the second adhesive layer 114, eventually resulting in damage to the hot melt adhesive layer 115 and the second adhesive layer 114. The intermediate barrier layer 113 on the aluminum-plastic film of the encapsulation structure contacts the tab 36 to form an electronic path. Damage to the second adhesive layer 114 and the hot melt adhesive layer 115 in the cell body 31 area can lead to short circuits or corrosion. By controlling the structure of the corner packaging portion 23 and the head packaging portion 21 on the packaging structure to satisfy the above formula B+H≤C≤A+J, the risk of short circuit and corrosion caused by contact between the bent connection portion 362 of the tab 36 and the packaging structure can be prevented.

[0081] To prevent the tab 36 at the tab encapsulation point from contacting the intermediate barrier layer 113 on the aluminum-plastic film of the encapsulation structure, an insulating protective adhesive layer 363 can be coated on the tab 36. Alternatively, the thickness of the insulating protective adhesive layer 363 can be increased and / or a high-melting-point insulating protective adhesive can be used to construct the insulating protective adhesive layer 363, effectively preventing the insulating protective adhesive layer 363 from melting through and causing the tab 36 to contact the aluminum-plastic film, forming an electronic pathway. Specifically, the thickness (i.e., single-layer thickness) D of the insulating protective adhesive layer 363 can be controlled to ≥75μm, for example, 75μm, 80μm, 90μm, 95μm, 100μm, etc. The melting point M of the insulating protective adhesive layer 363 can be controlled to ≥135℃. Specifically, the insulating protective adhesive layer 363 can be constructed using raw materials including polymers (such as polypropylene) and fillers, wherein the filler can be inorganic fillers such as glass fiber.

[0082] The above-mentioned battery is constructed by first using an aluminum-plastic film for battery encapsulation to build an encapsulation structure, and then using the encapsulation structure to encapsulate the battery cells. Alternatively, the aluminum-plastic film for battery encapsulation can be directly used for battery encapsulation. Furthermore, this invention also proposes a battery, see [link to relevant documentation]. Figure 9 The battery includes a cell and a casing, wherein the cell is encapsulated within the casing, and the cell includes a cell body 41 and a cell head 42; the specific structure of the cell is similar to... Figure 7 The battery cell shown is similar, including a positive electrode 43, a negative electrode 44, a separator 45, and tabs 46. The separator 45 is sandwiched between the positive electrode 43 and the negative electrode 44, and the outermost layer of the cell is the positive electrode 43. Tabs 46 are located at the head of the cell and include an exposed tab 461 and a bent connection portion 462. The bent connection portion 462 is located inside the encapsulation housing, with one end connected to the negative electrode 44 via a foil tab, and the other end connected to the exposed tab 461. The exposed tab 461 extends from the inside of the encapsulation housing to the outside. An insulating protective adhesive layer 463 is coated on the tab 46. The thickness (i.e., single-layer thickness) of the insulating protective adhesive layer 463 is ≥75μm, and the melting point M of the insulating protective adhesive layer 463 is ≥135℃.

[0083] In this embodiment, the battery encapsulation casing is made of... Figures 1 to 3 The battery shown is constructed from an aluminum-plastic film. The predetermined main body encapsulation part 12 corresponds to the encapsulated cell body 41, and the predetermined head encapsulation part 11 corresponds to the encapsulated cell head 42.

[0084] There is a corner area between the cell body 41 and the cell head 42, which is encapsulated by a predetermined corner encapsulation portion 13 of the aluminum-plastic film for battery encapsulation. Furthermore, in this embodiment, along the length of the cell, the length by which the edge of the negative electrode 44 on the cell head 42 extends beyond the edge of the positive electrode 43 is J; the distance between the negative electrode 44 and the predetermined head encapsulation portion 11 is A; the distance between the bent connection portion 462 of the tab 46 and the predetermined head encapsulation portion 11 is B; and the distance between the end of the predetermined corner encapsulation portion 13 facing away from the predetermined head encapsulation portion 11 and the predetermined head encapsulation portion 11 is C. C satisfies the following formula: B+H≤C≤A+J, where A, B, and J are all greater than 0, and 0.1mm≤H≤1mm. Through the above structural design, the risk of short circuits and corrosion caused by contact between the bent connection portion 462 of the tab 46 and the encapsulation shell can also be prevented.

[0085] This embodiment of the battery and Figure 7 The specific structure of the battery shown is similar, the main difference being that the battery in this embodiment directly uses... Figures 1 to 3 The battery shown uses an aluminum-plastic film to encapsulate the battery cell, which is different from... Figure 7 The battery cell shown uses Figures 1-3 The battery encapsulation is constructed using an aluminum-plastic film. Figures 4-6 The encapsulation structure shown encapsulates the battery cell. Based on a similar structural design, the battery in this embodiment has... Figure 7 The battery shown exhibits similar effects. Similarly, other aluminum-plastic films used for battery packaging mentioned above can be directly used to encapsulate the cells according to a battery structure similar to the one described above, and similar effects can be achieved.

[0086] In addition, during the research and experimentation process, the inventor followed a similar approach. Figure 7 The structure of the battery shown was examined by adjusting its structure and parameters, including adjusting the structural parameters of the corner and head packaging sections and the structural characteristics of the insulating protective adhesive layer, to investigate their impact on battery performance. The battery structure types, parameter controls, and battery performance test results for some experimental cases are shown in Tables 1 and 2 below. The difference between Comparative Example 1 and Example 1 is that Comparative Example 1 uses narrow strips of conventional hot melt adhesive to partially bond the aluminum-plastic film shell and the bare cell body to construct the battery. The hot melt adhesive includes an adhesive layer, an intermediate base layer, and a hot melt adhesive layer, and these layers are identical to the second adhesive layer and hot melt adhesive layer in the shell of Example 1. The aluminum-plastic film shell includes an outer protective layer, a first adhesive layer, an intermediate barrier layer, and an inner heat-sealing layer arranged sequentially, with each layer having the same thickness as the layers in the shell of Example 1. Specifically, during the adhesive bonding process, two strips of hot melt adhesive are bonded at intervals on both surfaces of the bare cell perpendicular to the thickness direction, and the bonded area is controlled to occupy 50% of the surface area.

[0087] In Table 1, T represents the thickness of the first sidewall encapsulation portion in the packaging structure, and T1 represents the thickness of the head encapsulation portion; A represents the distance between the negative electrode and the head encapsulation portion, B represents the distance between the bent connection portion of the electrode tab and the head encapsulation portion, J represents the length by which the edge of the negative electrode on the cell head extends beyond the edge of the positive electrode, C represents the distance between the end of the corner encapsulation portion away from the head encapsulation portion and the head encapsulation portion, D represents the thickness of the insulating protective adhesive layer, and M represents the melting point of the insulating protective adhesive layer. In Table 2, √ indicates that the requirements are met, and × indicates that the requirements are not met.

[0088] Table 1

[0089]

[0090]

[0091] Table 2

[0092]

[0093] According to Tables 1 and 2, the batteries in Examples 1 to 3 meet the requirements of B+H≤C≤A+J, D≥75μm and M≥135℃, indicating a low risk of short circuit.

[0094] In Example 4, the C value in the battery was too low, and two cells failed to short-circuit and catch fire after the drop test. The reason was that the second adhesive layer and the hot melt adhesive layer were worn during the drop. The tabs and the intermediate barrier layer (i.e., the aluminum layer) formed an electronic path. There were also areas on the main body of the battery cell with varying degrees of damage to the second adhesive layer and the hot melt adhesive layer, which led to the short circuit.

[0095] In Example 5, the C content in the battery is too high, and the actual thickness is slightly greater than the design thickness, resulting in a relatively small actual energy density gain.

[0096] Example 6 battery: The electrode tabs have a low melting point and are thin. During the hot box test, one short circuit failure occurred. Conceptually, after the hot melt adhesive in the main body area of ​​the cell melts, electrons can pass through the cell and aluminum layer. During the hot box test, after the adhesive on the cell electrode tabs melts, an electron path is formed between the negative electrode tab and the aluminum layer, resulting in a short circuit failure.

[0097] Comparative Example 1 battery: 3 cells failed in the drop test. The hot melt adhesive area was insufficient, and the bare cells were damaged and failed during the drop. After using an integrated aluminum-plastic film, the hot melt adhesive area increased, and the drop test was passed.

[0098] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. An aluminum laminate film for battery packaging, characterized by, The predetermined head packaging part comprises an outer protective layer, a first adhesive layer, an intermediate barrier layer, a second adhesive layer and a hot melt adhesive layer which are sequentially stacked; the predetermined head packaging part further comprises an inner layer heat sealing layer which is arranged on the surface of the hot melt adhesive layer away from the second adhesive layer.

2. The aluminum laminate for battery packaging according to claim 1, wherein The predetermined corner packaging part is arranged between the predetermined head packaging part and the predetermined main body packaging part; the predetermined corner packaging part comprises an outer protective layer, a first adhesive layer, an intermediate barrier layer, a second adhesive layer, a hot melt adhesive layer and an inner layer heat sealing layer which are sequentially stacked.

3. The aluminum laminate film for battery packaging according to claim 2, wherein The predetermined main body packaging part comprises a predetermined bottom packaging part and a predetermined side wall packaging part; the predetermined side wall packaging part comprises a first predetermined side wall packaging part and a second predetermined side wall packaging part; the first predetermined side wall packaging part is configured to package the side wall of the battery cell main body which is perpendicular to the thickness direction; the second predetermined side wall packaging part is configured to package the side wall of the battery cell main body which is parallel to the thickness direction; the edge of the second predetermined side wall packaging part is provided with a predetermined sealing part; the predetermined sealing part further comprises an inner layer heat sealing layer.

4. The aluminum laminate for battery packaging according to claim 3, wherein The thickness of the predetermined corner packaging part is the same as that of the predetermined head packaging part and is greater than that of the first predetermined side wall packaging part.

5. A package structure, characterized by, The battery packaging aluminum plastic film is constructed by any one of claims 1 to 4; the packaging structure comprises a packaging main body and a head packaging part; the packaging main body is constructed by the predetermined main body packaging part; the head packaging part is constructed by the predetermined head packaging part; the packaging main body has an opening at least at the head; the head packaging part is arranged at the head opening end of the packaging main body and is configured to block the head opening.

6. The package structure of claim 5, wherein, The battery packaging aluminum plastic film is constructed by any one of claims 2 to 4 and comprises a predetermined corner packaging part; The packaging structure further comprises a corner packaging part which is constructed by the predetermined corner packaging part; the head packaging part is connected with the packaging main body through the corner packaging part.

7. A battery, characterized by The battery cell is packaged in the packaging shell; the battery cell comprises a battery cell main body and a battery cell head; The packaging shell adopts the packaging structure of claim 5 or 6; the packaging main body corresponds to the packaging of the battery cell main body; the head packaging part corresponds to the packaging of the battery cell head; Alternatively, the packaging shell is constructed by the battery packaging aluminum plastic film of any one of claims 1 to 4; the predetermined main body packaging part corresponds to the packaging of the battery cell main body; the predetermined head packaging part corresponds to the packaging of the battery cell head.

8. The battery of claim 7, wherein, The battery cell comprises a positive electrode sheet, a negative electrode sheet, a separator and a tab; the separator is arranged between the positive electrode sheet and the negative electrode sheet; the tab is arranged at the battery cell head and comprises an exposed tab and a bent connection part; the bent connection part is arranged in the packaging shell and has one end connected with the positive electrode sheet and / or the negative electrode sheet and the other end connected with the exposed tab; the exposed tab extends from the inside of the packaging shell to the outside of the packaging shell.

9. The battery of claim 8, wherein, One end of the bent connecting part is connected with the negative tab, and the other end is connected with the exposed tab; and the outermost layer of the battery cell is the positive tab; The packaging shell adopts the packaging structure of claim 6; and along the length direction of the battery cell, the length of the edge of the negative tab on the head of the battery cell beyond the edge of the positive tab is J, the distance between the negative tab and the head packaging part is A, the distance between the bent connecting part and the head packaging part is B, and the distance between one end of the corner packaging part away from the head packaging part and the head packaging part is C, C satisfies the following formula: B+H≤C≤A+J, wherein A, B and J are all greater than 0, and 0.1mm≤H≤1mm; Alternatively, the packaging shell is constructed by the aluminum plastic film for battery packaging of any one of claims 2 to 4, and the aluminum plastic film for battery packaging comprises a predetermined corner packaging part; along the length direction of the battery cell, the length of the edge of the negative tab on the head of the battery cell beyond the edge of the positive tab is J, the distance between the negative tab and the head packaging part is A, the distance between the bent connecting part and the predetermined head packaging part is B, and the distance between one end of the predetermined corner packaging part away from the predetermined head packaging part and the predetermined head packaging part is C, C satisfies the following formula: B+H≤C≤A+J, wherein A, B and J are all greater than 0, and 0.1mm≤H≤1mm.

10. The battery of claim 9, wherein, An insulating protective adhesive layer is coated on the tab; the thickness of the insulating protective adhesive layer is ≥75μm, and / or the melting point of the insulating protective adhesive layer is ≥135℃.

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