Aluminum plastic film and battery

Abstract

The utility model discloses an aluminum plastic film and a battery, and belongs to the technical field of batteries. The aluminum-plastic film comprises a punching pit which forms an accommodating cavity with an open side, and the accommodating cavity is used for accommodating a pole core of the battery; the turned-over edge is connected to the peripheral edge of the punching pit; wherein the punching pit comprises a concave pit section and a transition section, the transition section is connected between the concave pit section and the turned-over edge, and a reinforcing piece is arranged on the surface, close to the containing cavity, of the transition section. The reinforcing piece is arranged on the surface, close to the accommodating cavity, of the transition section with the highest corrosion risk in a targeted manner, so that a lithium ion channel between the pole core and the aluminum-plastic film can be cut off or prolonged, chemical corrosion and electrochemical corrosion are prevented from being intensified, and further corrosion of the aluminum-plastic film is prevented.

Description

Technical Field

[0001] This application belongs to the technical field of batteries, and particularly relates to an aluminum-plastic film and a battery. Background Art

[0002] Soft-pack batteries usually use aluminum-plastic films as external packaging materials. Aluminum-plastic films have good embossing performance and can block the penetration of external moisture, oxygen, etc. into the battery interior. During the processing, embossments are usually formed on the aluminum-plastic film by stamping and stretching with a mold, and the electrode core is encapsulated in the embossments to complete the encapsulation. However, the structural strength of some positions of the aluminum-plastic film is greatly weakened after deep embossing, and even may be directly damaged, thus triggering the formation of a short-circuit channel. Under the long-term negative impact of the short-circuit channel, the aluminum layer of the aluminum-plastic film will directly contact and react with the internal electrolyte and be continuously consumed and corroded, thereby losing the ability to block the external environment, and further causing the battery to fail. Utility Model Content

[0003] This application aims to at least solve one of the technical problems existing in the prior art. For this purpose, this application provides an aluminum-plastic film and a battery, which can hinder the aggravation of chemical corrosion and the occurrence of electrochemical corrosion, thereby hindering the further occurrence of aluminum-plastic film corrosion.

[0004] In a first aspect, this application provides an aluminum-plastic film for use in a battery, including:

[0005] An embossment, the embossment forms a receiving cavity with one side open, and the receiving cavity is used to receive the electrode core of the battery;

[0006] A flanging, the flanging is connected to the outer peripheral edge of the embossment; wherein, the embossment includes a concave section and a transition section, the transition section is connected between the concave section and the flanging, and a reinforcing member is provided on the surface of the transition section close to the receiving cavity.

[0007] According to the aluminum-plastic film of this application, by specifically arranging a reinforcing member on the surface of the transition section close to the receiving cavity where the corrosion risk is the highest, on the one hand, it can cut off or extend the lithium-ion channel between the electrode core and the aluminum-plastic film, hinder the aggravation of chemical corrosion and the occurrence of electrochemical corrosion, thereby hindering the further occurrence of aluminum-plastic film corrosion. On the other hand, the manufacturing process is simple, thereby reducing the production cost of the aluminum-plastic film, and further reducing the production cost of the battery. On the other hand, compared with the solutions of adding an anti-corrosion layer and increasing the thickness of the aluminum-plastic film, it reduces the excessive increase in the thickness of the aluminum-plastic film, and realizes the miniaturization and lightweight design of the battery.

[0008] According to an embodiment of this application, the reinforcing member covers the entire surface of the transition section close to the receiving cavity.

[0009] According to an embodiment of the present application, a chamfer structure is provided between the pit section and the transition section, and the reinforcing member is provided on the surface of the chamfer structure close to the accommodation cavity.

[0010] According to an embodiment of the present application, the reinforcing member covers the entire surface of the chamfer structure close to the accommodation cavity.

[0011] According to an embodiment of the present application, the reinforcing member provided on the transition section and the reinforcing member provided on the chamfer structure are integrated into one body.

[0012] According to an embodiment of the present application, the thickness H of the reinforcing member satisfies: 2 mm ≤ H ≤ 10 mm.

[0013] According to an embodiment of the present application, the reinforcing member includes insulating tape.

[0014] According to an embodiment of the present application, the reinforcing member includes insulating film.

[0015] According to an embodiment of the present application, the reinforcing member includes insulating paint.

[0016] According to an embodiment of the present application, the aluminum-plastic film includes multiple laminated film layers formed by lamination, and the material of the reinforcing member is matched with the material of the film layer of the aluminum-plastic film closest to the accommodation cavity.

[0017] According to an embodiment of the present application, the aluminum-plastic film includes a heat-sealing layer, a barrier layer, and an outer barrier layer from close to the accommodation cavity to away from the accommodation cavity. The heat-sealing layer is made of PP material, the barrier layer is made of aluminum, the outer barrier layer is made of nylon, and the reinforcing member is made of PP material.

[0018] In a second aspect, the present application provides a battery, which includes:

[0019] A battery core;

[0020] The aluminum-plastic film as described in any one of the above, and the aluminum-plastic film wraps the battery core.

[0021] For the battery according to the present application, through the above arrangement of the aluminum-plastic film, on the one hand, it can cut off or extend the lithium-ion channel between the battery core and the aluminum-plastic film, hinder the aggravation of chemical corrosion and the occurrence of electrochemical corrosion, thereby hindering the further occurrence of aluminum-plastic film corrosion; on the other hand, the manufacturing process is simple, thus reducing the production cost of the aluminum-plastic film, and further reducing the production cost of the battery; on the other hand, compared with the scheme of adding an anti-corrosion layer and increasing the thickness of the aluminum-plastic film, it reduces the excessive addition of the thickness of the aluminum-plastic film, realizing the miniaturization and lightweight design of the battery.

[0022] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. Brief Description of the Drawings

[0023] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the description of embodiments in conjunction with the following drawings, in which:

[0024] Figure 1 is a schematic structural view of an aluminum-plastic film provided by an embodiment of the present application;

[0025] Figure 2 is a schematic structural view of a punching and flanging provided by an embodiment of the present application.

[0026] Reference Numerals:

[0027] Aluminum-plastic film 100;

[0028] Punching 110, receiving cavity 111, concave pit section 112, transition section 113;

[0029] Flanging 120, reinforcing member 130. Detailed Description of the Embodiments

[0030] The embodiments of the present application will be described in detail below. 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 by referring to the drawings are exemplary and are only used to explain the present application and should not be construed as a limitation of the present application.

[0031] The present application discloses an aluminum-plastic film 100, which is applied to a battery.

[0032] Reference is made below to Figure 1 - Figure 2 describe the aluminum-plastic film 100 according to an embodiment of the present application.

[0033] In some embodiments, as Figure 1 - Figure 2 shown, the aluminum-plastic film 100 includes: a punching 110 and a flanging 120.

[0034] As Figure 1 shown, the punching 110 forms a receiving cavity 111 that is open on one side, and the receiving cavity 111 is used to receive the electrode core of the battery; the flanging 120 is connected to the outer peripheral edge of the punching 110; wherein, the punching 110 includes a concave pit section 112 and a transition section 113, the transition section 113 is connected between the concave pit section 112 and the flanging 120, and a reinforcing member is provided on the surface of the transition section 113 close to the receiving cavity 111.

[0035] The shape and depth of the punching 110 can be precisely designed according to the size of the electrode core of the battery, so as to place the electrode core stably in the receiving cavity 111 as much as possible without leaving gaps.

[0036] For example, as Figure 1 shown, the punching pit 110 is approximately cuboid-shaped.

[0037] As Figure 1 - Figure 2 shown, the concave pit section 112 can be designed as a straight section, the transition section 113 can be designed as a curved section or an inclined section, and the opening size of one end of the transition section 113 connected to the concave pit section 112 can be smaller than the opening size of one end of the transition section 113 connected to the flanging 120, so as to reduce stress concentration and facilitate the installation of the electrode core and the reinforcing member at the same time.

[0038] The flanging 120 can be used for the subsequent packaging of the battery. Among them, the width and thickness of the flanging 120 are adjusted according to the packaging requirements of the battery. The electrode core of the battery is placed in the accommodating cavity 111, and the electrode tab of the electrode core or the connecting piece connected to the electrode tab is located on the flanging 120.

[0039] In this embodiment, the reinforcing members can be distributed on the entire surface of the transition section 113 close to the accommodating cavity 111.

[0040] In some other embodiments, the reinforcing members can be distributed in some areas of the surface of the transition section 113 close to the accommodating cavity 111.

[0041] In actual implementation, during the preparation process of the battery, a deep drawing operation is performed on the aluminum-plastic film 100 substrate to be processed. The bottom of the pit punched by the deep drawing punch is the concave pit section 112, the impact part of the die is the flanging 120, and a ramp stretching area, that is, the transition section 113, is formed between the concave pit section 112 and the flanging 120. A reinforcing member is arranged on the surface of the transition section 113 close to the accommodating cavity 111 to separate the electrode core and the transition section 113 without affecting the subsequent packaging of the aluminum-plastic film 100. Subsequent processes such as electrode core entering the shell, liquid injection, packaging, and curing are processed according to the conventional process to finally obtain a finished battery.

[0042] It should be noted that in the actual production process, metal particles or electrode shedding powders generated in each process are very likely to remain inside the battery. After the electrolyte is injected, the metal particles or electrode powders flow to the inner sides and bottom of the battery along with the electrolyte. After the battery is charged, electron short-circuit channels and ion short-circuit channels are formed under the action of these metal particles or electrode powders. The corrosion of the aluminum-plastic film 100 must have both electron short-circuit channels and ion short-circuit channels, and neither can be missing. Among them, especially the ramp stretching area formed after the deep drawing of the aluminum-plastic film 100 is extremely likely to form a large number of ion short-circuit channels, which forces the potential of the formed aluminum shell to be reduced to the lithium insertion potential of aluminum metal, triggering the occurrence of an electrochemical corrosion reaction.

[0043] In the related art, during the preparation process of some aluminum-plastic films, an anti-corrosion layer is added and bonded or hot-pressed to form a whole, and then processed according to the existing battery preparation process to obtain a battery with anti-inner corrosion, which can prevent the electrolyte from contacting and corroding the aluminum layer; or the thickness of the innermost film layer of the existing aluminum-plastic film is increased, and then processed according to the existing battery preparation process to obtain a battery with anti-inner corrosion to prevent the electrolyte from contacting and corroding the aluminum layer. However, the preparation process of the battery by adding an anti-corrosion layer is relatively complex, which increases the production cost of the aluminum-plastic film with an anti-corrosion layer and the entire battery; for the method of preparing a battery by increasing the thickness of the innermost film layer of the aluminum-plastic film, due to the high free fluidity of the electrolyte, it is easy to flow to the ramp stretching area of the aluminum-plastic film, resulting in inner corrosion; in addition, for the above two solutions, due to the significant increase in the thickness of the aluminum-plastic film, the space utilization rate of the battery is reduced, which is not conducive to the miniaturization and lightweight design of the battery.

[0044] It can be understood that according to the corrosion mechanism analysis of the aluminum-plastic film 100, after the aluminum-plastic film 100 is formed into an aluminum shell, the corrosion positions of the battery are concentrated in the bottom and side walls of the aluminum shell with electrolyte, that is Figure 1 the transition section 113 of the aluminum-plastic film 100 in. Since the outermost electrode of the internal electrode core is the negative electrode, and the free electrolyte is the most in the inner side wall and bottom positions of the aluminum shell corresponding to the negative electrode, and the HF content is also the most, the reaction between the passivation film Al2O3 on the aluminum shell surface and HF is intensified, resulting in inner corrosion. The aluminum-plastic film 100 of the present application can cut off or extend the lithium-ion channel between the electrode core and the aluminum-plastic film 100 by specifically setting a reinforcing member on the inner surface of the transition section 113 with the highest corrosion risk, hinder the intensification of chemical corrosion and the occurrence of electrochemical corrosion, thereby hindering the further occurrence of aluminum-plastic film 100 corrosion, and at the same time, the manufacturing process is simple, thereby reducing the production cost of the aluminum-plastic film 100, and further reducing the production cost of the battery. In addition, compared with the above solutions of adding an anti-corrosion layer and increasing the thickness of the aluminum-plastic film 100, the excessive increase in the thickness of the aluminum-plastic film 100 is reduced, realizing the miniaturization and lightweight design of the battery.

[0045] [[ID=⑧]]The aluminum-plastic film 100 provided by the embodiment of the present application, by specifically setting a reinforcing member on the surface of the transition section 113 with the highest corrosion risk close to the accommodating cavity 111, on the one hand, can cut off or extend the lithium-ion channel between the electrode core and the aluminum-plastic film 100, hinder the intensification of chemical corrosion and the occurrence of electrochemical corrosion, thereby hindering the further occurrence of aluminum-plastic film 100 corrosion, on the other hand, the manufacturing process is simple, thereby reducing the production cost of the aluminum-plastic film 100, and further reducing the production cost of the battery. On the other hand, compared with the solutions of adding an anti-corrosion layer and increasing the thickness of the aluminum-plastic film 100, the excessive increase in the thickness of the aluminum-plastic film 100 is reduced, realizing the miniaturization and lightweight design of the battery.

[0046] In some embodiments, such as Figure 1 shown, the reinforcing member covers the entire surface of the transition section 113 close to the accommodation cavity 111.

[0047] It can be understood that, on the one hand, the reinforcing member completely covers the surface of the transition section 113 close to the accommodation cavity 111, which can significantly improve the mechanical strength of this area and prevent deformation or damage caused by external forces during battery packaging, transportation and use; on the other hand, the complete coverage of the reinforcing member can effectively block the direct contact between corrosive substances such as electrolyte and the aluminum layer of the aluminum-plastic film 100, thereby extending the service life of the aluminum-plastic film 100; on the other hand, during the battery packaging process, the loading of the electrode core and the packaging operation of the aluminum-plastic film 100 may generate stress on the transition section 113. The complete coverage of the reinforcing member helps to optimize the stress distribution in this area, reduce the stress concentration phenomenon, and reduce the risk of damage caused by excessive stress.

[0048] The aluminum-plastic film 100 provided by the embodiments of the present application, through the structural design of the above-mentioned reinforcing member completely covering the surface of the transition section 113 close to the accommodation cavity 111, can significantly improve the mechanical strength of this area, reduce deformation or damage during packaging, transportation and use, and at the same time effectively block the direct contact between corrosive substances such as electrolyte and the aluminum layer of the aluminum-plastic film 100, thereby extending the service life of the aluminum-plastic film 100, and helps to optimize the stress distribution of the transition section 113 and reduce the risk of damage caused by excessive stress.

[0049] In some embodiments, a chamfer structure is provided between the concave section 112 and the transition section 113, and a reinforcing member is provided on the surface of the chamfer structure close to the accommodation cavity 111.

[0050] Among them, the chamfer structure can include but is not limited to R-angle structure, C-angle structure, line chamfer structure or multi-stage chamfer structure, etc., which is not limited here.

[0051] For example, in some embodiments, an R-angle structure is provided between the concave section 112 and the transition section 113.

[0052] It can be understood that the existence of the chamfer structure can significantly reduce the stress concentration phenomenon caused by the sudden change of the shape of the aluminum-plastic film 100. Through smooth transition, the chamfer structure disperses the stress to a larger area, thereby reducing the local stress peak and improving the anti-damage ability of the aluminum-plastic film 100. Adding a reinforcing member on the surface of the chamfer structure close to the accommodation cavity 111 can effectively block the contact between the aluminum-plastic film 100 at the position of the chamfer structure and the electrolyte, prevent the electrolyte from penetrating into the interior of the aluminum-plastic film 100, and reduce corrosion.

[0053] The aluminum-plastic film 100 provided by the embodiment of the present application can significantly reduce the stress concentration phenomenon caused by the abrupt change in the shape of the aluminum-plastic film 100 through the above-mentioned chamfer structure setting, improve the anti-breakage ability of the aluminum-plastic film 100, and in combination with the design of adding a reinforcing member on the surface of the chamfer structure close to the accommodation cavity 111, effectively block the contact between the aluminum-plastic film 100 and the electrolyte at the position of the chamfer structure, thereby further reducing the probability of contact and corrosion between the aluminum-plastic film 100 and the electrolyte.

[0054] In some embodiments, the reinforcing member covers the entire surface of the chamfer structure close to the accommodation cavity 111.

[0055] It can be understood that on the one hand, the full coverage of the reinforcing member on the chamfer structure further blocks the erosion of the electrolyte or other corrosive substances on the aluminum-plastic film 100, especially at this weak link of the chamfer structure, thereby extending the service life of the aluminum-plastic film 100; on the other hand, the full coverage of the reinforcing member provides full protection for the chamfer structure, optimizing the integrity and sealing performance of the aluminum-plastic film 100 when encapsulating the electrode core; on the other hand, the reinforcing member can disperse the stress generated by the volume change during the charge and discharge process of the battery, reduce the stress concentration points, and reduce the risk of material fatigue and breakage.

[0056] The aluminum-plastic film 100 provided by the embodiment of the present application further blocks the erosion of the electrolyte or other corrosive substances on the aluminum-plastic film 100 through the above-mentioned design of the reinforcing member covering the entire surface of the chamfer structure close to the accommodation cavity 111, especially at this weak link of the chamfer structure, thereby extending the service life of the aluminum-plastic film 100, and at the same time provides full protection for the chamfer structure, optimizing the integrity and sealing performance of the aluminum-plastic film 100 when encapsulating the electrode core, and the reinforcing member can disperse the stress generated by the volume change during the charge and discharge process of the battery, reducing the risk of fatigue and breakage.

[0057] In some embodiments, the reinforcing member provided on the transition section 113 and the reinforcing member provided on the chamfer structure are integrated.

[0058] In this embodiment, the reinforcing member can be widened to cover both the transition section 113 and the chamfer structure at the same time. The specific widening width can be designed according to the size of the chamfer structure and actual requirements. For example, the width of the reinforcing member can be 1 mm - 10 mm greater than the width of the transition section 113.

[0059] In other embodiments, the reinforcing member provided on the transition section 113 and the reinforcing member provided on the chamfer structure are separately designed, and the reinforcing member provided on the transition section 113 and the reinforcing member provided on the chamfer structure can be in close butt joint or there can be partial area overlap.

[0060] The aluminum-plastic film 100 provided by the embodiments of the present application, through the integrated design of the reinforcing member provided in the transition section 113 and the reinforcing member provided in the chamfer structure, provides continuous reinforcement from the transition section 113 to the chamfer structure, which helps to maintain the consistency and stability of the entire structure of the aluminum-plastic film 100. At the same time, there is no need to separately manufacture and bond two independent parts, reducing the manufacturing steps and material waste, thereby improving the production efficiency and helping to reduce the production cost.

[0061] In some embodiments, the thickness H of the reinforcing member satisfies: 2 mm ≤ H ≤ 10 mm.

[0062] Specifically, the thickness H of the reinforcing member can be 2 mm, 3.5 mm, 5.82 mm, 6 mm, 8.367 mm, 10 mm or other values between 2 mm and 10 mm, which is not limited here.

[0063] The aluminum-plastic film 100 provided by the embodiments of the present application, through the above range limitation of the thickness H of the reinforcing member, the reinforcing member can provide sufficient support force to minimize the deformation or breakage of the aluminum-plastic film 100 during battery packaging and use, and will not increase unnecessary weight and cost due to excessive thickness. Such a design achieves a good balance between structural strength and rigidity.

[0064] In some embodiments, the reinforcing member includes an insulating tape.

[0065] Among them, the bonding method of the insulating tape can include but is not limited to manual bonding and automatic bonding, etc., which is not limited here.

[0066] For example, in some embodiments, the bonding method of the insulating tape is automatic bonding.

[0067] The bonding force standard can include but is not limited to 50 N / 15 mm. The peeling force magnitude can be controlled by the actual edge voltage. For example, the edge voltage standard is 0 V - 1 V. The larger the edge voltage, the larger the ion channel may be. Therefore, if the edge voltage corresponding to the bonding force of 50 N / 15 mm is 0 V, the bonding force standard is set to be greater than or equal to 50 N / 15 mm.

[0068] In actual implementation, the insulating tape is directly pasted on the surface of the transition section 113 and / or the chamfer structure close to the accommodation cavity 111. When pasting, it should be ensured that the tape is flat, bubble-free, and closely adheres to the surface of the transition section 113 and / or the chamfer structure close to the accommodation cavity 111. For complex shapes or areas that are difficult to directly paste, preformed insulating tape or die-cut insulating tape can be used to better adapt to the shape and size of the aluminum-plastic film 100.

[0069] The aluminum-plastic film 100 provided by the embodiments of the present application sets the reinforcing member as an insulating tape, which improves the tensile strength and tear strength of the transition section 113, effectively reduces the breakage incidence rate of the aluminum-plastic film 100 and the corrosion degree under long-term use. At the same time, the bonding process of the insulating tape is relatively simple, which can simplify the production process, improve the production efficiency, and help alleviate the internal short circuit and external electromagnetic interference of the battery, thereby enhancing the safety and reliability of the battery.

[0070] In some embodiments, the reinforcing member includes an insulating film.

[0071] The attachment method of the insulating film may include, but is not limited to, thermoplastic stretching film, lamination composite, hot melt bonding, etc., and is not limited herein.

[0072] For example, in some embodiments, the attachment method of the insulating film is thermoplastic stretching film.

[0073] The aluminum-plastic film 100 provided by the embodiments of the present application sets the reinforcing member as an insulating film, which improves the tensile and puncture resistance of the transition section 113, reduces the breakage risk, and thus extends the service life of the aluminum-plastic film 100. At the same time, it helps alleviate the internal short circuit and external electromagnetic interference of the battery, enhancing the safety and reliability of the battery. Additionally, the insulating film usually has good thermal stability, which helps maintain the performance of the battery in a high-temperature environment.

[0074] In some embodiments, the reinforcing member includes insulating paint.

[0075] The coating methods of the insulating paint include, but are not limited to, spraying, dipping, brushing, flow coating, electrophoresis, or screen printing, etc., and are not limited herein.

[0076] For example, in some embodiments, the coating method of the insulating paint is spraying.

[0077] The aluminum-plastic film 100 provided by the embodiments of the present application sets the reinforcing member as insulating paint. The coating formed after the insulating paint is cured can improve the impact and abrasion resistance of the transition section 113, so as to alleviate the corrosion of the electrolyte to the aluminum-plastic film 100 as much as possible. At the same time, it significantly improves the insulation performance of the aluminum-plastic film 100, effectively reduces the occurrence of electrical breakdown and leakage phenomena, and maintains the safe operation of the battery. Meanwhile, the insulating paint coating process is relatively simple, easy to control the quality and achieve automated production.

[0078] In some embodiments, the aluminum-plastic film 100 includes multiple composite film layers, and the material of the reinforcing member matches the material of the film layer of the aluminum-plastic film 100 closest to the accommodation cavity 111.

[0079] Here, multiple means three or more layers. For example, in some embodiments, the aluminum-plastic film 100 includes three composite film layers.

[0080] It can be understood that since the film layer of the aluminum-plastic film 100 closest to the accommodation cavity 111 is in direct contact and combination with the reinforcement, if the material properties of the film layer of the aluminum-plastic film 100 closest to the accommodation cavity 111 and the reinforcement differ greatly, it is very difficult to firmly attach the reinforcement to the aluminum-plastic film 100 during setting. In the case where the material of the reinforcement matches the material of the film layer of the aluminum-plastic film 100 closest to the accommodation cavity 111, in other words. The film layer of the aluminum-plastic film 100 closest to the accommodation cavity 111 and the reinforcement have the same or similar material properties. In this way, on the one hand, the degree of fusion between the aluminum-plastic film 100 and the reinforcement is greatly improved, enabling the aluminum-plastic film 100 and the reinforcement to form a more compact and stable combination, which helps to resist external impacts and vibrations and improve the stability and durability of the overall structure. On the other hand, the film layer of the aluminum-plastic film 100 closest to the accommodation cavity 111 and the reinforcement have similar resistance to the electrolyte, which helps to maintain the electrolyte corrosion resistance of the inner layer of the aluminum-plastic film 100 and extend the service life of the battery. On the other hand, the design of material matching helps to simplify the manufacturing process and procedures. For example, it can reduce interface problems between different materials, and reduce processing difficulty and cost.

[0081] In some embodiments, the aluminum-plastic film 100 includes a heat-sealing layer, a barrier layer, and an outer barrier layer from close to the accommodation cavity 111 to away from the accommodation cavity 111. The heat-sealing layer is made of PP (Polypropylene), the barrier layer is made of aluminum, the outer barrier layer is made of nylon, and the reinforcement is made of PP (Polypropylene).

[0082] Through the design that both the heat-sealing layer and the reinforcement are made of PP (Polypropylene), the film layer of the aluminum-plastic film 100 closest to the accommodation cavity 111 and the reinforcement have the same material properties, maximizing the degree of fusion between the aluminum-plastic film 100 and the reinforcement, thereby maximizing the maintenance of the electrolyte corrosion resistance of the inner layer of the aluminum-plastic film 100, and at the same time reducing the internal stress caused by different material thermal expansion coefficients, which helps to improve the stability of the entire aluminum-plastic film 100 structure.

[0083] In some embodiments, the heat-sealing layer can also be made of EAA (Ethylene Acrylic Acid), and the reinforcement can also be made of EAA (Ethylene Acrylic Acid).

[0084] It should be noted that, in addition to the above-mentioned solution where the heat-sealing layer and the reinforcing member are made of the same material, the reinforcing member can also be selected from materials that are different from but have a relatively high compatibility with the film layer material of the closest accommodation cavity 111 of the aluminum-plastic film 100. For example, if the heat-sealing layer is made of PP (Polypropylene), the reinforcing member can also be made of modified CPP or polymer materials with similar properties.

[0085] This application also discloses a battery.

[0086] In some embodiments, the battery includes: a battery core and the aluminum-plastic film 100 as described in any of the above.

[0087] The aluminum-plastic film 100 is wrapped around the battery core.

[0088] For the battery provided by the embodiments of this application, through the above-mentioned setting of the aluminum-plastic film 100, on the one hand, it can cut off or extend the lithium-ion channels between the battery core and the aluminum-plastic film 100, hinder the aggravation of chemical corrosion and the occurrence of electrochemical corrosion, thereby hindering the further occurrence of corrosion of the aluminum-plastic film 100. On the other hand, the manufacturing process is simple, thus reducing the production cost of the aluminum-plastic film 100, and further reducing the production cost of the battery. On the other hand, compared with the solutions of adding an anti-corrosion layer and increasing the thickness of the aluminum-plastic film 100, it reduces the excessive increase in the thickness of the aluminum-plastic film 100, achieving the miniaturization and lightweight design of the battery.

[0089] The terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances, so that the embodiments of this application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are usually of the same type, and do not limit the number of objects. For example, the first object can be one or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally indicates an "or" relationship between the related objects before and after.

[0090] In the description of this application, it should be understood that the orientation or positional relationships indicated by the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing this application 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 this application.

[0091] In the description of this application, the "first feature", "second feature" can include one or more of such features.

[0092] In the description of the present application, "a plurality of" means two or more.

[0093] In the description of the present application, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween.

[0094] In the description of the present application, a first feature being "above", "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature.

[0095] Other configurations such as... and... etc. and operations according to embodiments of the present application are known to those of ordinary skill in the art, and will not be described in detail herein.

[0096] In the description of this specification, the description with reference to terms such as "an embodiment", "some embodiments", "illustrative 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 application. 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 may be combined in a suitable manner in any one or more embodiments or examples.

[0097] Although embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. An aluminum-plastic film, used for batteries, characterized in that: include: A pit, wherein the pit forms a receiving cavity with one side open, and the receiving cavity is used to receive the battery core; A flange, the flange being connected to the outer peripheral edge of the pit; wherein the pit comprises a pit section and a transition section, the transition section being connected between the pit section and the flange, and a reinforcement member being provided on the surface of the transition section close to the accommodating cavity.

2. The aluminum-plastic film according to claim 1, characterized in that The reinforcement member covers the entire surface of the transition section close to the accommodating cavity.

3. The aluminum-plastic film according to claim 1, characterized in that A chamfered structure is provided between the recessed section and the transition section, and the reinforcement is provided on a surface of the chamfered structure close to the accommodating cavity.

4. The aluminum-plastic film according to claim 3, characterized in that The reinforcement member covers the entire surface of the chamfered structure close to the accommodating cavity.

5. The aluminum-plastic film according to claim 3, characterized in that: The reinforcement member provided at the transition section and the reinforcement member provided at the chamfered structure are integrated into one body.

6. The aluminum-plastic film according to claim 1, characterized in that The thickness H of the reinforcement member satisfies: 2mm≤H≤10mm.

7. The aluminum-plastic film according to any one of claims 1 to 6, characterized in that The reinforcement comprises an insulating tape; and / or, The reinforcement member includes an insulating film; and / or, The reinforcement comprises an insulating varnish.

8. The aluminum-plastic film according to any one of claims 1 to 6, characterized in that The aluminum-plastic film comprises a composite multi-layer film layer, and the material of the reinforcement matches the material of the film layer of the aluminum-plastic film closest to the accommodating cavity.

9. The aluminum-plastic film according to claim 8, characterized in that: The aluminum-plastic film includes a heat-sealing layer, a barrier layer and an outer resistance layer from close to the accommodating cavity to away from the accommodating cavity. The heat-sealing layer is made of PP material, the barrier layer is made of aluminum, the outer resistance layer is made of nylon, and the reinforcement is made of PP material.

10. A battery, characterized in that: include: Pole core; The aluminum-plastic film according to any one of claims 1 to 9, wherein the aluminum-plastic film is wrapped around the pole core.

Images