Battery and electric equipment

Abstract

The utility model discloses a battery and electric equipment. The battery comprises a battery cell; the packaging film comprises a main body part, a first edge folding part, a second edge folding part and a third edge folding part, the main body part is provided with a storage cavity, the battery cell is arranged in the storage cavity, and the first edge folding part, the second edge folding part and the third edge folding part are all connected to the main body part; the first edge folding part, the second edge folding part and the third edge folding part are all located outside the storage cavity, the first edge folding part and the second edge folding part are located on the two sides of the battery cell in the first direction respectively, and the third edge folding part is located on one side of the battery cell in the second direction; the first direction is perpendicular to the second direction; the thickness of the third edge folding part is greater than that of the first edge folding part; and / or the thickness of the third edge folding part is greater than that of the second edge folding part. According to the battery disclosed by the utility model, the size of the battery can be reduced, and the energy density of the battery is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to batteries and electrical equipment. Background Technology

[0002] Aluminum-plastic film is a key material for lithium-ion battery packaging. Its structure can be simply understood as a sandwich structure, namely an inner cPP (modified polypropylene) layer, a middle Al (aluminum) layer, and an outermost Nylon layer.

[0003] The inner cPP layer primarily serves to prevent the acidic substances in the electrolyte from continuously corroding the aluminum layer. During the operation of a lithium-ion battery, the electrolyte is typically acidic, which can corrode the aluminum layer. The presence of the cPP layer can, to some extent, isolate the electrolyte from direct contact with the aluminum layer, thereby slowing down the corrosion rate of the aluminum layer and extending the battery's lifespan.

[0004] The middle aluminum layer serves to protect the internal environment of the battery cell. The aluminum layer has excellent conductivity and shielding properties, effectively preventing external electromagnetic interference from affecting the inside of the cell. It also helps to prevent the electrode materials inside the cell from being contaminated or damaged by the external environment.

[0005] The outermost Nylon layer primarily serves to prevent moisture penetration. Nylon material has excellent barrier properties, effectively preventing external substances such as moisture and oxygen from entering the battery, thus avoiding performance degradation or failure of the electrode materials and electrolyte due to moisture.

[0006] However, in practical applications, when the battery cell is not susceptible to external contamination, the outer Nylon layer becomes somewhat redundant. For example, in certain battery packaging processes, after the cell undergoes secondary sealing, it is folded again. The side seals and secondary seals are bent at 90° and then glued into the gap between the folded edge and the side of the cell body. After heating and curing, the folded edge is prevented from opening. In this case, the folded edge and the side of the cell body cannot be exposed to external contaminants. Therefore, the surface Nylon layer not only becomes redundant but also negatively impacts the width dimension, ultimately reducing the battery's energy density. Utility Model Content

[0007] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a battery that can reduce battery size and increase battery energy density.

[0008] This utility model also proposes an electrical device.

[0009] The battery according to an embodiment of the first aspect of the present invention comprises:

[0010] Battery cell;

[0011] The packaging film includes a main body, a first folded edge, a second folded edge, and a third folded edge. The main body has a storage cavity, in which the battery cell is disposed. The first folded edge, the second folded edge, and the third folded edge are all connected to the main body and are located outside the storage cavity. The first folded edge and the second folded edge are respectively located on both sides of the battery cell in a first direction, and the third folded edge is located on one side of the battery cell in a second direction. The first direction and the second direction are perpendicular.

[0012] Wherein, the thickness of the third folded edge is greater than the thickness of the first folded edge;

[0013] And / or, the thickness of the third folded edge is greater than the thickness of the second folded edge.

[0014] The battery according to the first aspect of the present invention has at least the following beneficial effects: it can reduce the size of the battery and increase the energy density of the battery.

[0015] In this application, the first and second folded edges are located on opposite sides of the cell in a first direction, and the third folded edge is located on one side of the cell in a second direction perpendicular to the first direction. By making the thickness of the third folded edge greater than that of the first folded edge, or greater than that of the second folded edge, or greater than that of both the first and second folded edges, a reduction in size in the cell's first direction can be achieved. By reducing the thickness of the first and second folded edges, the proportion of inactive material is reduced, thereby increasing the mass proportion of active material in the cell. This directly improves the battery's energy density, enabling the battery to store more energy with the same weight. Therefore, reducing the thickness of the first and / or second folded edges reduces the battery's size and increases its energy density.

[0016] According to some embodiments of the present invention, the first folded edge includes two heat-sealing layers, two metal layers and an outer layer, and the outer layer, the metal layer, the two heat-sealing layers and the metal layer are stacked sequentially along the thickness direction of the first folded edge.

[0017] According to some embodiments of the present invention, the second folded edge includes two heat-sealing layers, two metal layers and an outer layer, and the outer layer, the metal layer, the two heat-sealing layers and the metal layer are stacked sequentially along the thickness direction of the second folded edge.

[0018] According to some embodiments of the present invention, the second folded edge includes two heat-sealing layers and two metal layers, and the metal layers, the two heat-sealing layers, and the metal layers are stacked sequentially along the thickness direction of the second folded edge.

[0019] According to some embodiments of the present invention, the first folded edge includes two heat-sealing layers and two metal layers, and the metal layers, the two heat-sealing layers, and the metal layers are stacked sequentially along the thickness direction of the first folded edge.

[0020] According to some embodiments of the present invention, the second folded edge includes two heat-sealing layers and two metal layers, and the metal layers, the two heat-sealing layers, and the metal layers are stacked sequentially along the thickness direction of the second folded edge.

[0021] According to some embodiments of the present invention, the main body includes two main face portions and two side face portions disposed opposite to each other, the two ends of the main face portions are respectively connected to the two side face portions, and the thickness of the main face portions is greater than the thickness of the side face portions.

[0022] According to some embodiments of the present invention, the main surface includes a heat-sealing layer, a metal layer and a first outer layer, and the heat-sealing layer, the metal layer and the first outer layer are stacked sequentially along the thickness direction of the main surface.

[0023] The side portion includes a heat-sealing layer, a metal layer, and a second outer layer, which are stacked sequentially along the thickness direction of the side portion; the thickness of the first outer layer is greater than the thickness of the second outer layer.

[0024] According to some embodiments of the present invention, the main surface includes a heat-sealing layer, a metal layer, and an outer layer, wherein the heat-sealing layer, the metal layer, and the outer layer are stacked sequentially along the thickness direction of the main surface.

[0025] The side portion includes a heat-sealing layer and a metal layer, which are stacked sequentially along the thickness direction of the side portion.

[0026] The electrical device according to an embodiment of the second aspect of the present invention includes the battery described in any of the above claims.

[0027] The electrical device according to the second aspect of the present invention has at least the following beneficial effects: it can reduce the size of the battery and increase the energy density of the battery.

[0028] In this application, the first and second folded edges are located on opposite sides of the cell in a first direction, and the third folded edge is located on one side of the cell in a second direction perpendicular to the first direction. By making the thickness of the third folded edge greater than that of the first folded edge, or greater than that of the second folded edge, or greater than that of both the first and second folded edges, a reduction in size in the cell's first direction can be achieved. By reducing the thickness of the first and second folded edges, the proportion of inactive material is reduced, thereby increasing the mass proportion of active material in the cell. This directly improves the battery's energy density, enabling the battery to store more energy at the same weight. Therefore, electrical devices using the battery of this application can reduce battery size and increase battery energy density.

[0029] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0031] Figure 1 This is a front view of the battery of this utility model;

[0032] Figure 2 for Figure 1 A cross-sectional view of the prior art at point AA;

[0033] Figure 3 for Figure 1 Cross-sectional view of the first embodiment at point AA;

[0034] Figure 4 for Figure 1 A cross-sectional view of the second embodiment at point AA;

[0035] Figure 5 for Figure 1 A cross-sectional view of the third embodiment at point AA;

[0036] Figure 6 for Figure 1 A cross-sectional view of the fourth embodiment at point AA;

[0037] Figure 7 for Figure 1 A cross-sectional view of the fifth embodiment at point AA;

[0038] Figure 8 for Figure 1 Cross-sectional view of the sixth embodiment at point AA;

[0039] Figure 9 for Figure 1 Cross-sectional view of the seventh embodiment at point AA;

[0040] Figure 10 for Figure 1 Cross-sectional view of the eighth embodiment at point AA;

[0041] Figure 11 for Figure 1 Cross-sectional view of the ninth embodiment at point AA;

[0042] Figure 12 for Figure 1 Cross-sectional view of the tenth embodiment at point AA;

[0043] Figure 13 for Figure 1 A cross-sectional view of the eleventh embodiment at point AA.

[0044] Figure label:

[0045] Battery cell 10; packaging film 20; main body 100; storage cavity 101; main face 110; first outer layer 111; second outer layer 112; side face 120; first folded edge 200; heat-sealing layer 210; metal layer 220; outer layer 230; second folded edge 300; third folded edge 400. Detailed Implementation

[0046] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0047] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0048] In the description of this utility model, "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.

[0049] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0050] In the description of this utility model, 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 utility model. 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.

[0051] As a core energy storage device in modern electronic devices and the new energy field, the reliability and performance of the packaging materials of lithium-ion batteries directly affect the battery's safety, energy density, and lifespan. Currently, pouch batteries commonly use aluminum-plastic film as the packaging material, with a typical structure being a three-layer composite "sandwich" design, consisting of a modified polypropylene (cPP) layer, an aluminum (Al) layer, and a nylon (Nylon) layer from the inside out. The cPP layer is the heat-sealing layer in this application, the Al layer is the metal layer in this application, and the Nylon layer is the outer layer in this application.

[0052] The inner cPP layer is in direct contact with the electrolyte, and its main function is to prevent acidic components in the electrolyte (such as HF produced by the decomposition of LiPF6) from continuously corroding the intermediate Al layer. Through chemical modification, the cPP material possesses excellent acid resistance and heat-sealing performance, enabling reliable sealing with the tabs during the battery heat-sealing process.

[0053] The intermediate Al layer serves as the core barrier layer, while the aluminum foil provides high conductivity, electromagnetic shielding, and mechanical strength to prevent external environmental factors (such as oxygen, moisture, and mechanical impact) from penetrating the cell and to prevent leakage of internal active materials.

[0054] The outer Nylon layer is usually made of biaxially oriented nylon (BOPA). Its high crystallinity and dense structure give the material excellent water-blocking properties, which can effectively prevent external water vapor from penetrating and prevent the electrode material and electrolyte from deteriorating due to moisture absorption.

[0055] After the battery cell completes side sealing (primary encapsulation) and secondary sealing (secondary encapsulation), the encapsulation area is folded (e.g., 90° bend) and filled with adhesive for curing and shaping. This physically isolates the folded edge from the side of the battery cell body, completely blocking the intrusion path of external contaminants (such as moisture and dust). In this case, the water-blocking protection function of the outer Nylon layer is replaced by the encapsulation process, and the outer Nylon layer is no longer needed to protect the battery cell. At this point, the Nylon layer becomes a redundant structure. The thickness of the Nylon layer is typically 15–25 μm, accounting for 20%–30% of the total thickness of the encapsulation material. This creates an ineffective volume in the width direction of the battery cell, limiting the improvement of battery energy density. Furthermore, the interfacial adhesion between the Nylon layer and the adhesive curing process is poor, which may affect the structural stability of the folded edge area and increase the risk of encapsulation failure.

[0056] In related technologies, optimization solutions for aluminum-plastic films mostly focus on material modification (such as improving the acid resistance of cPP and optimizing the ductility of the Al layer) or process parameter adjustment (such as heat sealing temperature control), but do not fundamentally improve the structural redundancy problem in specific packaging scenarios. In traditional three-layer structures, the presence of non-critical functional layers (such as the outer Nylon layer) not only increases the weight and volume of the battery in certain application scenarios, but also limits the further improvement of battery energy density, making it difficult to effectively meet the dual requirements of modern batteries for lightweight and high energy density.

[0057] In view of the above problems, this application proposes a battery that can at least partially solve the above problems.

[0058] Reference Figure 1 According to an embodiment of the present invention, a battery includes a battery cell 10 and a packaging film 20. The packaging film 20 includes a main body 100, a first folded edge 200, a second folded edge 300, and a third folded edge 400. The main body 100 has a storage cavity 101, in which the battery cell 10 is disposed. The first folded edge 200, the second folded edge 300, and the third folded edge 400 are all connected to the main body 100 and are located outside the storage cavity 101. The first folded edge 200 and the second folded edge 300 are respectively located on both sides of the battery cell 10 in a first direction, and the third folded edge 400 is located on one side of the battery cell 10 in a second direction. The first and second directions are perpendicular. The thickness of the third folded edge 400 is greater than the thickness of the first folded edge 200; and / or, the thickness of the third folded edge 400 is greater than the thickness of the second folded edge 300.

[0059] The battery according to the embodiments of the present invention has at least the following beneficial effects: it can reduce the size of the battery and increase the energy density of the battery.

[0060] In this application, the first folded edge 200 and the second folded edge 300 are located on opposite sides of the cell 10 in a first direction, and the third folded edge 400 is located on one side of the cell 10 in a second direction perpendicular to the first direction. By making the thickness of the third folded edge 400 greater than the thickness of the first folded edge 200, or making the thickness of the third folded edge 400 greater than the thickness of the second folded edge 300, or making the thickness of the third folded edge 400 greater than the thickness of the first folded edge 200 and the second folded edge 300, the benefit of size reduction in the first direction of the cell 10 can be obtained. By reducing the thickness of the first folded edge 200 and the second folded edge 300, the proportion of inactive material is reduced, thereby increasing the mass proportion of active material in the cell 10. This directly improves the energy density of the battery, enabling the battery to store more energy with the same weight. Therefore, reducing the thickness of the first folded edge 200 and / or the second folded edge 300 can reduce the size of the battery and increase its energy density.

[0061] In this application, the first direction is the left-right direction in the figure, and the second direction is the up-down direction in the figure.

[0062] Reference Figure 3 , Figure 4 According to some embodiments of the present invention, the first folded edge portion 200 includes two heat-sealing layers 210, two metal layers 220, and an outer layer 230. Along the thickness direction of the first folded edge portion 200, the outer layer 230, the metal layer 220, the two heat-sealing layers 210, and the metal layer 220 are sequentially stacked. Specifically, refer to... Figure 2 In related technologies, the first folded edge portion 200 and the second folded edge portion 300 generally include a six-layer stacked structure. From the inside out, this six-layer structure consists of an outer layer 230, a metal layer 220, two heat-sealing layers 210, another metal layer 220, and the outer layer 230. After the side sealing of the battery cell 10 is completed, the encapsulation area is bent through the first folded edge portion 200 and the second folded edge portion 300 (e.g., ...). Figure 2 The first folded edge 200 and the second folded edge 300 are physically isolated from the side of the main body of the battery cell 10 by bending at 90° as shown in the figure and filling with glue (not shown in the figure) for curing and shaping, so that the first folded edge 200 and the second folded edge 300 are physically isolated from the side of the main body of the battery cell 10, which can block the intrusion of external pollutants.

[0063] However, in related technologies, after folding, adhesive is applied between the side of the cell 10 and the folded edge, and the folded edge, after bending, forms two outer layers 230 in contact, meaning adhesive is applied between the two outer layers 230. The outer layer 230 is typically a nylon layer, its function being to protect the cell 10 from external moisture penetration. After the adhesive is applied and cured, it itself can prevent the risk of external moisture penetration. In this case, the nylon layer of the outer layer 230 appears somewhat redundant, affecting the dimensional optimization of the battery in the width direction. Therefore, in this application, we consider thinning or removing the unnecessary outer layer 230 (hereinafter also referred to as the nylon layer). This allows for a reduction in the battery's width dimension without affecting the safety performance of the cell 10, providing more space for active materials and thus improving the battery's energy density.

[0064] Furthermore, the existing technology that uses glue droplets to fix the nylon layers has poor fixing effect, which may affect the structural stability of the folded edge area and increase the risk of encapsulation failure. Therefore, this application also designs to remove one outer layer 230 of the first folded edge 200, thereby reducing the size of the cell 10, while increasing the fixing effect of the glue, which can improve both the energy density and safety performance of the battery.

[0065] The first folded edge 200 includes an outer layer 230 in two forms: one is to remove the outer layer 230 near the battery cell 10 (i.e., the outer layer 230 where the glue is applied), and to retain the outer layer 230 away from the battery cell 10 (e.g., ...). Figure 3 (As shown), another method is to remove the outer layer 230 that is far from the cell 10 and retain the outer layer 230 that is close to the inside of the cell 10 (as shown). Figure 4 (As shown).

[0066] Generally, the thickness of the nylon layer and adhesive (used to bond the various structural layers) in a conventional battery cell 10 is approximately 20μm-30μm. Therefore, after removing one outer layer 230, the battery of this application gains 20μm-30μm in the width direction, which can reduce the overall weight of the battery. Removing the nylon layer can significantly reduce the overall weight of the battery, which can improve the portability and battery life of weight-sensitive applications such as portable electronic devices. Secondly, it can also reduce the size of the battery, improve the battery's lightweight, and save space for installing other devices after the battery is installed. In addition, due to the removal of the nylon layer, the width dimension of the battery cell 10 can be reduced by 20μm-30μm. Without changing the original width dimension of the battery cell 10, this dimension can be used to increase the content of active materials, thereby increasing the energy density and extending the battery's battery life to meet users' needs for long battery life. In addition, it can improve heat dissipation performance. The nylon layer has certain heat insulation properties. Removing the nylon layer can improve the heat dissipation efficiency of the battery. During high-power discharge or fast charging, good heat dissipation performance can prevent the battery from overheating and improve the safety and stability of the battery.

[0067] It should be noted that in this application, after the battery is encapsulated, the two encapsulation layers in the first folded edge 200, the second folded edge 300 and the third folded edge 400 are pressed together to form an integral structure. In the figure, for ease of explanation, the two encapsulation layers are represented by dashed lines, but in fact the two encapsulation layers are a whole.

[0068] Reference Figure 5 According to some embodiments of this utility model, the second folded edge portion 300 includes two heat-sealing layers 210, two metal layers 220, and an outer layer 230. Along the thickness direction of the second folded edge portion 300, the outer layer 230, metal layer 220, two heat-sealing layers 210, and metal layer 220 are sequentially stacked. In addition to removing one outer layer 230 of the first folded edge portion 200 as described above, one outer layer 230 of the second folded edge portion 300 can also be removed. The method of removing one outer layer 230 of the second folded edge portion 300 is the same as that of the first folded edge portion 200; either one outer layer 230 close to the battery cell 10 or one outer layer 230 far from the battery cell 10 can be removed. Figure 5 Let's take the removal of one outer layer 230 near the cell 10 as an example. As a result, in the width direction of the cell 10, the first folded edge 200 on one side of the cell 10 has one less outer layer 230, and the second folded edge 300 on the other side of the cell 10 has one less outer layer 230. That is, two outer layers 230 are removed along the width direction of the cell 10. Therefore, the battery's gain in the width direction increases by 40μm-60μm, further reducing the battery size and increasing the battery's energy density.

[0069] In addition, refer to Figure 6 , Figure 7 In this application, the method of removing the outer layer 230 of the first folded edge 200 and the outer layer 230 of the second folded edge 300 can be selected according to the actual situation. Specifically, the outer layer 230 near the cell 10 can be removed from both the first folded edge 200 and the second folded edge 300 (e.g., Figure 5 Alternatively, the outer layer 230 away from the battery cell 10 can be removed from both the first folded edge 200 and the second folded edge 300 (e.g., Figure 6 Furthermore, the outer layer 230 near the battery cell 10 can be removed from the first folded edge 200, and the outer layer 230 away from the battery cell 10 can be removed from the second folded edge 300 (e.g., Figure 7 Alternatively, the first folded edge 200 removes the outer layer 230 away from the cell 10, and the second folded edge 300 removes the outer layer 230 close to the cell 10 (not shown). Regardless of the removal method chosen, along the width direction of the cell 10, the first folded edge 200 and the second folded edge 300 remove a total of two outer layers 230, which increases the battery's width gain by 40μm-60μm, reduces the battery's size in the width direction, and improves the battery's energy density.

[0070] Reference Figure 8 , Figure 9 According to some embodiments of this utility model, the second folded edge portion 300 includes two heat-sealing layers 210 and two metal layers 220. Along the thickness direction of the second folded edge portion 300, the metal layers 220, the two heat-sealing layers 210, and the metal layers 220 are sequentially stacked. In some embodiments, based on removing one outer layer 230 from the first folded edge portion 200, the second folded edge portion 300 can also remove two outer layers 230, increasing the battery's width gain by 60μm-80μm, further reducing the battery size and improving its energy density.

[0071] Reference Figure 10 According to some embodiments of this utility model, the first folded edge portion 200 includes two heat-sealing layers 210 and two metal layers 220. Along the thickness direction of the first folded edge portion 200, the metal layers 220, the two heat-sealing layers 210, and the metal layers 220 are sequentially stacked. Specifically, in addition to removing one outer layer 230 of the first folded edge portion 200 and retaining the other outer layer 230, both outer layers 230 of the first folded edge portion 200 can also be removed, leaving only two metal layers 220 and two heat-sealing layers 210 in the first folded edge portion 200, where the two heat-sealing layers 210 form a single unit. Thus, by reducing the number of outer layers 230 in the first folded edge portion 200, the battery's width gain increases by 40μm-60μm, further reducing the battery size and increasing its energy density.

[0072] In this structure, if the second folded edge 300 does not remove the outer layer 230, the battery's gain in the width direction increases by 40μm-60μm; if the second folded edge 300 removes one outer layer 230, the battery's gain in the width direction increases by 60μm-80μm; and if the second folded edge 300 removes both outer layers 230, the battery's gain in the width direction increases by 80μm-100μm. Therefore, the battery of this application can further reduce the battery size and increase the battery's energy density.

[0073] Reference Figure 11 According to some embodiments of this utility model, the second folded edge portion 300 includes two heat-sealing layers 210 and two metal layers 220. Along the thickness direction of the second folded edge portion 300, the metal layers 220, the two heat-sealing layers 210, and the metal layers 220 are sequentially stacked. Specifically, based on the removal of two outer layers 230 from the first folded edge portion 200, the second folded edge portion 300 also removes two outer layers 230, increasing the battery's width gain by 80μm-100μm, further reducing the battery size and increasing its energy density.

[0074] Reference Figure 12 According to some embodiments of the present invention, the main body 100 includes two main face portions 110 and two side face portions 120 disposed opposite to each other. The two ends of the main face portions 110 are respectively connected to the two side face portions 120, and the thickness of the main face portions 110 is greater than the thickness of the side face portions 120. In some embodiments, the main body 100 includes two main face portions 110 and two side face portions 120 located on the large surface of the cell 10. By making the thickness of the side face portions 120 smaller than the thickness of the main face portions 110 (e.g., by thinning or removing unnecessary outer layers 230 as described later), the size of the battery in the width direction can be reduced, and the energy density of the battery can be improved.

[0075] According to some embodiments of this utility model, the main surface portion 110 includes a heat-sealing layer 210, a metal layer 220, and a first outer layer 111, which are sequentially stacked along the thickness direction of the main surface portion 110. The side portion 120 includes a heat-sealing layer 210, a metal layer 220, and a second outer layer 112, which are sequentially stacked along the thickness direction of the side portion 120; the thickness of the first outer layer 111 is greater than the thickness of the second outer layer 112. By setting the thickness of the second outer layer 112 of the side portion 120 to be less than the thickness of the first outer layer 111 of the main surface portion 110, specifically by thinning the thickness of the second outer layer 112 through laser cleaning, the size of the battery in the width direction can be reduced, thereby increasing the energy density of the battery.

[0076] Reference Figure 13 According to some embodiments of this utility model, the main surface 110 includes a heat-sealing layer 210, a metal layer 220, and an outer layer 230, which are sequentially stacked along the thickness direction of the main surface 110; the side surface 120 includes a heat-sealing layer 210 and a metal layer 220, which are sequentially stacked along the thickness direction of the side surface 120. Besides using laser cleaning to thin the outer layer 230 of the side surface 120, the outer layer 230 can also be directly removed by laser cleaning. Therefore, by removing the outer layer 230 of the side surface 120, the battery's width gain increases by 40μm-60μm. Based on this, by simultaneously removing two outer layers 230 of the first folded edge portion 200 and two outer layers 230 of the second folded edge portion 300, a total of six outer layers 230 are removed in the width direction of the cell 10, increasing the battery's width gain by 120μm-180μm. Thus, by removing all the outer layers 230 in the width direction, the battery's size in the width direction can be reduced, thereby increasing the battery's energy density.

[0077] In this application, the outer layer 230 can be removed using laser cleaning. The laser intensity and amplitude are controllable, allowing for precise cleaning of the nylon layer while preventing damage to the Al layer, thus avoiding any negative impact on the safety performance of the battery cell 10. Simultaneously, removing the side seals, second seals, and the nylon layers on both sides of the battery cell 10 during the edge-folding process prevents contamination of the battery cell 10 surface in previous processes, and also prevents negative impacts on the depth drawing and forming performance of the aluminum-plastic film. After the nylon layer is removed, the fresh Al is exposed to air and rapidly oxidizes, further forming a dense oxide layer. At the microscopic level, the oxide and edge-folding adhesive create more chemical anchoring, allowing a small amount of adhesive to generate effective bonding force.

[0078] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A battery, characterized by, The battery comprises: an electric core; a packaging film, comprising a main body part, a first folding edge part, a second folding edge part and a third folding edge part, the main body part has a storage cavity, the electric core is arranged in the storage cavity, the first folding edge part, the second folding edge part and the third folding edge part are connected to the main body part, the first folding edge part, the second folding edge part and the third folding edge part are located outside the storage cavity, the first folding edge part and the second folding edge part are respectively located on both sides of the electric core in a first direction, the third folding edge part is located on one side of the electric core in a second direction, and the first direction and the second direction are perpendicular; wherein the thickness of the third folding edge part is greater than the thickness of the first folding edge part; and / or the thickness of the third folding edge part is greater than the thickness of the second folding edge part.

2. The battery of claim 1, wherein, The first folding edge part comprises two heat-seal layers, two metal layers and an outer layer, and the outer layer, the metal layer, the two heat-seal layers and the metal layer are sequentially stacked along the thickness direction of the first folding edge part.

3. The battery of claim 2, wherein, The second folding edge part comprises two heat-seal layers, two metal layers and an outer layer, and the outer layer, the metal layer, the two heat-seal layers and the metal layer are sequentially stacked along the thickness direction of the second folding edge part.

4. The battery of claim 2, wherein, The second folding edge part comprises two heat-seal layers and two metal layers, and the metal layer, the two heat-seal layers and the metal layer are sequentially stacked along the thickness direction of the second folding edge part.

5. The battery of claim 1, wherein, The first folding edge part comprises two heat-seal layers and two metal layers, and the metal layer, the two heat-seal layers and the metal layer are sequentially stacked along the thickness direction of the first folding edge part.

6. The battery of claim 5, wherein, The second folding edge part comprises two heat-seal layers and two metal layers, and the metal layer, the two heat-seal layers and the metal layer are sequentially stacked along the thickness direction of the second folding edge part.

7. The battery of claim 1, wherein, The main body part comprises two oppositely arranged main face parts and two oppositely arranged side face parts, the two ends of the main face part are respectively connected to the two side face parts, and the thickness of the main face part is greater than the thickness of the side face part.

8. The battery of claim 7, wherein, The main face part comprises a heat-seal layer, a metal layer and a first outer layer, and the heat-seal layer, the metal layer and the first outer layer are sequentially stacked along the thickness direction of the main face part; The side face part comprises a heat-seal layer, a metal layer and a second outer layer, and the heat-seal layer, the metal layer and the second outer layer are sequentially stacked along the thickness direction of the side face part; the thickness of the first outer layer is greater than the thickness of the second outer layer.

9. The battery of claim 7, wherein, The main face part comprises a heat-seal layer, a metal layer and an outer layer, and the heat-seal layer, the metal layer and the outer layer are sequentially stacked along the thickness direction of the main face part; The side face part comprises a heat-seal layer and a metal layer, and the heat-seal layer and the metal layer are sequentially stacked along the thickness direction of the side face part.

10. An electrical device, characterized by The battery comprises any one of claims 1 to 9.

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