Housing structure, battery, preparation method, battery pack, and electric device

Abstract

The application discloses a shell structure, a battery, a preparation method of the battery, a battery pack and an electric equipment. The shell structure comprises a shell. The shell comprises a bottom wall and a side wall extending from the periphery of the bottom wall, and the side wall is formed with a groove. The outer side surface of the shell is provided with a first protective sub-layer and a second protective sub-layer, and the first protective sub-layer covers at least the outer side surface of the groove. The second protective sub-layer covers at least the first protective sub-layer.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery casing structure, a battery, a battery manufacturing method, a battery pack, and an electrical device. Background Technology

[0002] In battery manufacturing, the processing technology is often accompanied by the deformation of the casing. For example, a grooving process is commonly used, where a carbide roller applies progressive pressure along the circumference of the plated casing, forming a rolled section at the end for mechanical engagement with a cover plate and a sealing ring to achieve a seal. However, this grooving process can cause micro-cracks or localized damage to the original protective layer (such as the nickel layer) on the casing surface due to mechanical rolling. Because some parts of the casing structure do not provide targeted protection for the areas corresponding to the formed grooves, the base layer of the casing (such as steel) is directly exposed to the outside. External corrosive media such as humid air may cause corrosion, damaging the casing structure. In severe cases, this can lead to casing perforation, electrolyte leakage, battery failure, and even safety risks. Summary of the Invention

[0003] To address at least one of the aforementioned problems, embodiments of this application provide a battery casing structure, a battery, a method for manufacturing the battery, a battery pack, and an electrical device.

[0004] This application provides a battery casing structure. The casing structure includes a casing. The casing includes a bottom wall and a side wall extending from the periphery of the bottom wall, the side wall forming a groove. The outer surface of the casing is provided with a first protective sub-layer and a second protective sub-layer, the first protective sub-layer at least covering the outer surface of the groove. The second protective sub-layer at least covers the first protective sub-layer.

[0005] In some embodiments, the sidewall includes a body portion, a rolled portion, and a crimping portion. In a direction away from the bottom wall, the body portion, the rolled portion, and the crimping portion are sequentially connected. The rolled portion protrudes relative to the body portion toward the center of the housing structure, forming the groove. The rolled portion and the crimping portion together form a receiving cavity. The crimping portion includes a first sub-part and a second sub-part, with opposite ends of the first sub-part connected to the rolled portion and the second sub-part, respectively. The second sub-part is spaced apart from the bottom wall. The housing structure also includes a sealing ring, which is housed within the receiving cavity and seals the housing structure.

[0006] In some embodiments, the first protective sublayer also covers at least a portion of the outer surface of the crimped portion, and the second protective sublayer completely covers the first protective sublayer.

[0007] In some embodiments, the first protective sublayer covers at least a portion of the outer surface of the body portion, and the second protective sublayer completely covers the first protective sublayer.

[0008] In some embodiments, the thickness T1 of the first protective sublayer and the thickness T of the shell satisfy the following condition: 0.2 ≤ T1 / T ≤ 1.0.

[0009] In some embodiments, the thickness T of the housing satisfies: 0.1mm ≤ T ≤ 0.6mm.

[0010] In some embodiments, the first protective sublayer is at least one of an organosilicon layer, a polyurethane layer, an epoxy resin layer, and a photocurable layer; when the first protective sublayer is an organosilicon layer, the thickness T1 of the first protective sublayer satisfies: 0.1mm ≤ T1 ≤ 0.5mm; when the first protective sublayer is a polyurethane layer or an epoxy resin layer, the thickness T1 of the first protective sublayer satisfies: 0.05mm ≤ T1 ≤ 0.50mm; when the first protective sublayer is a photocurable layer, the thickness T1 of the first protective sublayer satisfies: 0.05mm ≤ T1 ≤ 0.30mm.

[0011] In some embodiments, the thickness T2 of the second protective sublayer satisfies: 0.05mm ≤ T2 ≤ 0.40mm.

[0012] In some embodiments, the second protective sublayer is at least one of a polyvinyl chloride layer, a polyethylene terephthalate layer, and a polyimide layer.

[0013] In some embodiments, the housing includes a base layer and a functional layer. The base layer includes an inner surface and an outer surface that are opposite to each other in the thickness direction of the housing. The functional layer covers the inner surface and / or the outer surface. The thickness T1 of the first protective sublayer and the thickness T3 of the functional layer satisfy: 5T3≤T1.

[0014] In some embodiments, the opening size W of the groove in the axial direction of the housing satisfies: 0 <W≤4mm。

[0015] In some embodiments, the thickness T1 of the first protective sublayer and the thickness T of the shell satisfy the following condition: 0.4 ≤ T1 / T ≤ 0.6.

[0016] In some embodiments, the thickness T of the housing satisfies: 0.2mm ≤ T ≤ 0.5mm.

[0017] In some embodiments, the first protective sublayer is at least one of an organosilicon layer, a polyurethane layer, an epoxy resin layer, and a photocurable layer; when the first protective sublayer is an organosilicon layer, the thickness T1 of the first protective sublayer satisfies: 0.2mm ≤ T1 ≤ 0.4mm; when the first protective sublayer is a polyurethane layer or an epoxy resin layer, the thickness T1 of the first protective sublayer satisfies: 0.20mm ≤ T1 ≤ 0.35mm; when the first protective sublayer is a photocurable layer, the thickness T1 of the first protective sublayer satisfies: 0.10mm ≤ T1 ≤ 0.25mm.

[0018] In some embodiments, the thickness T2 of the second protective sublayer satisfies: 0.10mm≤T2≤0.30mm.

[0019] In some embodiments, the maximum distance D1 between the outer side of the groove corresponding to the housing and the connection point between the crimping portion and the coiling portion in the radial direction of the housing satisfies: 0 <D1≤6mm。

[0020] In some embodiments, the radial distance D2 from the first protective sublayer to the crimped portion satisfies: 0.5mm ≤ D2 ≤ 4mm.

[0021] In some embodiments, the radial distance D3 from the first protective sublayer to the body portion satisfies: 0.5mm ≤ D3 ≤ 4mm.

[0022] In some embodiments, the axial distance D4 from the first protective sublayer to the crimped portion satisfies: 1mm ≤ D4 ≤ 8mm.

[0023] In some embodiments, the axial distance D5 from the first protective sublayer to the body portion satisfies: 1mm ≤ D5 ≤ 8mm.

[0024] In some embodiments, the first protective sublayer further extends to the outer side of the crimping portion and / or the outer side of the body portion, and the maximum width Lmax of the first protective sublayer in the radial direction of the housing and the minimum thickness Tmin of the crimping portion satisfy: 10Tmin≤Lmax.

[0025] In some embodiments, the second protective sublayer surrounds the outer wall of the housing structure, extends to the press-fit portion and / or body portion of the housing, and closes the groove.

[0026] In some embodiments, the second protective sublayer is an insulating layer. The second protective sublayer is heat-shrinkable.

[0027] In some embodiments, the housing includes a body portion, a crimping portion, and a pressing portion, and forms a groove with an inlet at one end. The second protective sub-layer includes two first sub-layers and a second sub-layer. The two first sub-layers respectively cover at least a portion of the outer surface of the pressing portion and at least a portion of the outer surface of the body portion. The second sub-layers are connected to the two first sub-layers respectively, and at least a portion of the second sub-layers extends into the groove through the inlet and covers the first protective sub-layers. The thickness of the second sub-layer is greater than the thickness of the first sub-layers.

[0028] Secondly, this application provides a battery. The battery includes the housing structure and electrode assembly described in any of the above embodiments. The housing structure includes a housing and a cover plate, the housing and the cover plate being connected to form a receiving cavity. The electrode assembly is housed within the receiving cavity.

[0029] In some embodiments, the battery further includes a busbar electrically connected to the electrode assembly. The busbar is disposed between the electrode assembly and the cover plate in the height direction of the housing. The peripheries of both the busbar and the cover plate extend into the receiving cavity of the housing structure and are pressed together by the crimping and pressing portions of the housing structure.

[0030] Thirdly, this application provides a method for manufacturing a battery. The method is used to manufacture the battery described in any of the above embodiments. The method includes: providing a workpiece, the workpiece including a bottom wall and a side wall extending from the periphery of the bottom wall, the bottom wall and the side wall forming a loading cavity; performing a grooving process on the side wall to form a body portion and a pre-rolled portion, the pre-rolled portion being connected to the body portion and protruding relative to the body portion toward the center of the loading cavity to form a recessed groove, the recessed groove being located outside the workpiece, the workpiece including an inner side and an outer side opposite to each other in the thickness direction; forming a first protective sub-layer on the outer side of the workpiece, the first protective sub-layer at least covering the outer side of the pre-rolled portion; and loading the electrode assembly into the loading cavity. The sealing ring and cover plate are loaded onto the initial winding portion; a snap-fit ​​operation is performed on the portion of the side wall connected to the initial winding portion and away from the main body portion to form the housing, the housing including a winding portion and a pressing portion, the winding portion being formed by the initial winding portion, the pressing portion being connected to the end of the winding portion away from the main body portion, the recessed groove being shaped into a groove, the first protective sub-layer at least covering the outer side surface of the groove; the groove having an inlet at one end and being closed at the other end, the cover plate being connected to the housing and together forming an accommodating cavity; and a second protective sub-layer is provided around the outer side surface of the housing, the second protective sub-layer at least covering the inlet, the second protective sub-layer at least covering the first protective sub-layer.

[0031] In some embodiments, forming a first protective sublayer on the outer side of the workpiece includes: disposing a protective substrate at least on the outer side of the initial roll portion; and curing the protective substrate to form the first protective sublayer.

[0032] In some embodiments, the provision of the protective substrate on the outer side of the initial roll portion includes: when the protective substrate is silicone, dotting, spraying, or brushing the protective substrate on the outer side of the initial roll portion; when the protective substrate is polyurethane, brushing the protective substrate on the outer side of the initial roll portion; when the protective substrate is epoxy resin, spraying the protective substrate on the outer side of the initial roll portion; and when the protective substrate is a photocurable substrate, dotting the protective substrate on the outer side of the initial roll portion.

[0033] In some embodiments, curing the protective matrix and forming the first protective sublayer includes: when the protective matrix is ​​silicone, allowing the workpiece with the protective matrix to stand at room temperature to cure the protective matrix, wherein the standing time t1 satisfies 2 hours ≤ t1 ≤ 24 hours; or, heating the protective matrix to cure the protective matrix, wherein the heating temperature Tem and heating time t2 satisfy: 60 degrees ≤ Tem ≤ 80 degrees, 10 minutes ≤ t2 ≤ 30 minutes; when the protective matrix is ​​polyurethane, heating the protective matrix to cure the protective matrix... The protective substrate is cured, wherein the heating temperature Tem and the heating time t2 satisfy: 60 degrees ≤ Tem ≤ 80 degrees, 10 minutes ≤ t2 ≤ 30 minutes; when the protective substrate is epoxy resin, the protective substrate is heated to cure the protective substrate, wherein the heating temperature Tem and the heating time t2 satisfy: 80 degrees ≤ Tem ≤ 120 degrees, 20 minutes ≤ t2 ≤ 60 minutes; and when the protective substrate is a photocurable substrate, the protective substrate is irradiated with ultraviolet light to cure the protective substrate, wherein the irradiation time t3 satisfies: 5 seconds ≤ t3 ≤ 30 seconds.

[0034] In some embodiments, the second protective sublayer is heat-shrinkable. The preparation method further includes: heating at least the region of the second protective sublayer opposite to the inlet, causing at least a portion of the second protective sublayer opposite to the inlet to deform thermally, extending through the inlet into the groove and covering at least a portion of the first protective sublayer.

[0035] In some embodiments, the preparation method further includes: loading the electrode assembly into the loading cavity, and loading the sealing ring, cover plate, and manifold onto the initial winding portion; and performing a snap-fit ​​operation on the portion of the sidewall connected to the initial winding portion and away from the body portion to form the housing, the housing including a winding portion and a pressing portion, the winding portion being formed by the initial winding portion, the pressing portion being connected to the end of the winding portion away from the body portion, the recessed groove being shaped into a groove, the first protective sublayer at least covering the outer side surface of the groove; the groove having an inlet at one end and being closed at the other end, the cover plate and the manifold being connected to the housing and jointly pressed by the winding portion and the pressing portion, the cover plate and the housing together forming an accommodating cavity.

[0036] Fourthly, this application provides a battery pack. The battery pack includes the battery described in any of the above embodiments, or a battery manufactured using the preparation method described in any of the above embodiments.

[0037] Fifthly, this application provides an electrical device. The electrical device includes a battery as described in any of the above embodiments, or a battery manufactured by the preparation method described in any of the above embodiments, or a battery pack as described in any of the above embodiments.

[0038] In the battery casing structure, battery, battery manufacturing method, battery pack, and electrical device of this application, a groove is formed on the side wall of the casing. A first protective sub-layer and a second protective sub-layer are disposed on the outer surface of the casing to protect the casing. The first protective sub-layer at least covers the outer surface of the groove to protect the relatively weak area where the groove is located. The second protective sub-layer at least covers the first protective sub-layer to protect the first protective sub-layer and further enhance the protective effect on the area where the groove is located. At this time, the contact between external humid air and other corrosive media and the casing in the area where the groove is located is blocked, making it less likely to cause corrosion of the casing. The structural integrity and reliability of the casing are better, and the service life and safety of the battery are effectively guaranteed.

[0039] Additional aspects and advantages of this application 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 this application. Attached Figure Description

[0040] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein: Figure 1 This is a three-dimensional structural schematic diagram of a battery according to some embodiments of this application; Figure 2 yes Figure 1 The diagram shows a cross-sectional view of the battery cut by line II-II; Figure 3 yes Figure 2 The diagram shown is a partially enlarged view of the cross-sectional view of the battery taken by line II-II at point III, and the battery of other embodiments of this application. Figure 3 The enlarged view of a portion of the same part of the cross-sectional view shown; Figure 4 This is a cross-sectional schematic diagram of the workpiece after it has been fitted with the electrode assembly according to some embodiments of this application; Figure 5 yes Figure 4 The cross-sectional view of the workpiece after the electrode assembly is installed is shown in the figure at point V, which is a partial enlarged view. Figure 6 This is a schematic flowchart of a battery preparation method according to some embodiments of this application; Figure 7 This is a schematic flowchart of a battery preparation method according to some embodiments of this application; Figure 8 This is a schematic flowchart of a battery preparation method according to some embodiments of this application; Figure 9 This is a schematic flowchart of a battery preparation method according to some embodiments of this application; Figure 10 This is a schematic flowchart of a battery preparation method according to some embodiments of this application; Figure 11 This is a cross-sectional schematic diagram of a battery according to other embodiments of this application; Figure 12 This is a cross-sectional schematic diagram of the workpiece after it has been fitted with the electrode assembly according to some other embodiments of this application; Figure 13 This is a schematic flowchart of a battery preparation method according to some embodiments of this application; Figure 14 This is a three-dimensional structural schematic diagram of a battery pack according to some embodiments of this application; Figure 15 This is a schematic diagram of the planar structure of an electrical device according to some embodiments of this application.

[0041] The reference numerals in the detailed embodiments are as follows: 10,000 electrical devices; 1,000 battery packs; 100 batteries; 30 electrode assemblies; 50 junction boxes; Shell structure 10; accommodating cavity 101; Cover plate 11; Shell 13; bottom wall 131; side wall 133; body part 1331; rolled part 1333; groove 13337; inlet 13339; crimping part 1335; first sub-part 13351; second sub-part 13353; receiving cavity 1337; first protective sub-layer 1391; second protective sub-layer 1393; first sub-layer 13931; second sub-layer 13933; base layer 1355; inner surface 13551; outer surface 13553; functional layer 1358; Sealing ring 15; Workpiece 19; Loading cavity 191; Initial roll section 193; Recessed groove 195; Altitude direction Z. Detailed Implementation

[0042] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0043] In the description of this application, it should be understood that the terms "center", "length", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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 application.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0046] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0047] In the battery manufacturing process, the processing technology is usually accompanied by the deformation of the casing. For example, a grooving process is commonly used, where a hard alloy roller applies pressure gradually along the circumference of the plated casing, forming a rolled section at the end for mechanical engagement with a cover plate and a sealing ring to achieve a seal. However, this grooving process can cause micro-cracks or localized damage to the original protective layer (such as the nickel layer) on the casing surface due to mechanical rolling. Because some casing structures do not provide targeted protection for the areas corresponding to the formed grooves, the base layer of the casing (such as steel) is directly exposed to the outside. External humid air and other corrosive media may cause corrosion, damaging the casing structure. In severe cases, this can lead to casing perforation, electrolyte leakage, battery failure, or even safety risks. To solve the above problems, this application provides a battery casing structure 10 ( Figures 1 to 3 ,and Figure 11 (as shown), battery 100 ( Figures 1 to 3 ,and Figure 11 (as shown), battery preparation method ( Figures 6 to 10 ,and Figure 13 As shown), battery pack 1000 ( Figure 14 (as shown) and electrical equipment 10000 ( Figure 15 (As shown).

[0048] Please refer to Figures 1 to 3 This application provides a housing structure 10 for a battery 100. The housing structure 10 includes a housing 13. The housing 13 includes a bottom wall 131 and a side wall 133 extending from the periphery of the bottom wall 131, and the side wall 133 forms a groove 13337. The outer surface of the housing 13 is provided with a first protective sub-layer 1391 and a second protective sub-layer 1393, the first protective sub-layer 1391 at least covering the outer surface of the groove 13337. The second protective sub-layer 1393 at least covers the first protective sub-layer 1391.

[0049] Specifically, battery 100 is an electrochemical device that directly converts internally stored chemical energy into direct current electrical energy. The core structure of battery 100 for electrochemical reactions is an electrode assembly 30 housed within the casing structure 10. The electrode assembly 30 typically consists of one or more independent units capable of electrochemical reactions, each unit including a positive electrode, a negative electrode, and a separator (not shown). Battery 100 also includes an electrolyte. The electrolyte includes, but is not limited to, lithium salts, organic solvents, and additives. After formation, the electrode assembly 30 has gaps, allowing the electrolyte to enter and wet the electrode assembly 30, ensuring that ions can move freely during charging and discharging. Through a controllable electrochemical reaction, battery 100 establishes a potential difference between the positive and negative electrodes, thereby continuously providing electrical energy to the device being powered when connected to an external circuit.

[0050] The casing structure 10 is a structure in the battery 100 used to house structures other than the casing structure 10. The casing structure 10 can be made of materials such as, but not limited to, steel, aluminum alloy, and polymer materials. Steel casing structures 10 have excellent compressive strength and are often made from cold-rolled steel strips such as DC and SPCC through welding or deep drawing processes. Aluminum alloy casing structures 10 have low density, good thermal conductivity, and are easy to process and form; they are typically made from aluminum alloys of grades such as 3003, 5052, or 1060 through extrusion or stamping. Polymer casing structures 10 have good insulation properties and high chemical stability, making them suitable for specific consumer electronics applications. In the figures, this application uses a cylindrical shape for the overall form of the casing structure 10 as an example. Figure 1 and Figure 14 As shown, the overall shape of the shell structure 10 can also be a cube, etc., and this application does not limit it.

[0051] The housing 13 is the main body of the housing structure 10. In some embodiments, the housing structure 10 also includes a cover plate 11, which is a structure in the housing structure 10 used to cover the housing 13. The cover plate 11 will be described in detail below. It can be understood that the housing structure 10, as a key component for encapsulating the electrode assembly 30, isolating the external environment, and providing structural support, directly determines the safety, durability, and energy density of the battery 100 through its structure and materials.

[0052] In the manufacturing of the housing structure 10, the housing 13 is typically deformed during processing. For example, a grooving process is typically performed on the housing 13 during the manufacturing of the housing structure 10. The grooving process refers to a plastic forming process in which radial pressure is applied to the side wall 133 of the housing 13 by rotating rollers, thereby creating a groove 13337 of a predetermined shape at a predetermined position. The area corresponding to the groove 13337 formed therein is the coiled portion 1333, which is an annular flange structure that cooperates with the cover plate 11 and works with the sealing ring 15 to achieve axial compression and sealing.

[0053] However, this process has inherent defects: the high contact stress (typically hundreds of megapascals) between the roller and the shell surface induces local lattice distortion and dislocation slip in the protective layer (such as the electrodeposited nickel layer) on the shell surface, resulting in the loss of the integrity of the protective layer and the formation of penetrating microcracks or peeling areas. Furthermore, because some shell structures do not provide targeted protection for the grooves, the shell substrate is directly exposed to the environmental medium. The exposed areas easily adsorb water molecules and oxygen in a humid atmosphere, forming electrochemical corrosion micro-cells. Under long-term action, this can easily lead to penetrating corrosion perforation, causing electrolyte leakage or deterioration of internal active materials, ultimately resulting in internal pressure imbalance, insulation failure, and increased risk of thermal runaway and short circuits. To address this problem, this application provides a shell structure 10 with good corrosion resistance, specifically by protecting the grooves 13337 to prevent battery 100 failure caused by corrosion.

[0054] The bottom wall 131 is at least a partial structure of the bottom of the shell 13. After the shell structure 10 is assembled, the bottom wall 131 and the cover plate 11 are opposite each other in the height direction Z of the shell structure 10. The side wall 133 is at least a partial structure of the side of the shell 13. The side wall 133 is connected to the periphery of the bottom wall 131 and extends from the periphery of the bottom wall 131. The side wall 133 and the bottom wall 131 can be an integral structure or a separate structure. When the side wall 133 and the bottom wall 131 are separate structures, the connection between the side wall 133 and the bottom wall 131 is usually a non-removable connection. Removable connections include, but are not limited to, one or more combinations of methods such as screw connections and snap-fit ​​connections. Non-removable connections include, but are not limited to, one or more combinations of methods such as gluing, welding, sintering, hot melting, bonding, and mechanical clamping. The following definitions of detachable and non-removable connections will not be repeated. It is understood that the side wall 133 is also used to connect with the cover plate 11 to form a complete shell structure 10.

[0055] The groove 13337 is a spatial structure formed in the housing 13 after a grooving process. The groove 13337 is located at the end of the sidewall 133 away from the bottom wall 131, and is recessed towards the center of the housing structure 10 relative to at least a portion of the other areas of the sidewall 133 where the groove 13337 is not formed. The shape and size of the groove 13337 are related to the feed rate of the grooving process. The groove 13337 forms a semi-enclosed space facing the outside of the housing structure 10. The function of at least a portion of the housing 13 surrounding the groove 13337 includes, but is not limited to, fixing the electrode assembly 30, fixing the busbar structure, and achieving a sealing fit between the housing 13 and the cover plate 11.

[0056] The first protective sublayer 1391 is a structure in the shell structure 10 used to improve the corrosion resistance of the shell 13. The first protective sublayer 1391 is usually made of a corrosion-resistant material with high density, such as corrosion-resistant metal, silicone, polyurethane, epoxy resin, UV-curable adhesive, etc.

[0057] The first protective sublayer 1391 at least covers the outer surface of the housing 13 corresponding to the groove 13337, such as Figure 3 As shown in the enlarged view in (A), the first protective sublayer 1391 can be understood to protect localized areas of the housing 13 weakened by the grooving process, preventing corrosion caused by contact between at least a portion of the housing 13 corresponding to the groove 13337 and corrosive media such as external humid air. It should be noted that... Figure 3 (A) shows the first protective sublayer 1391 covering the outer side of the groove 13337. The first protective sublayer 1391 can also cover a larger area of ​​the outer side of the housing 13, or even the entire outer side of the housing 13. The illustration does not constitute a limitation on the actual installation position of the first protective sublayer 1391.

[0058] The second protective sublayer 1393 is a structure in the shell structure 10 that at least protects the first protective sublayer 1391. The second protective sublayer 1393 is disposed on the outside of the shell structure 10 and at least covers the first protective sublayer 1391. Please refer to... Figure 2 and Figure 3 The enlarged view in (A) shows that the second protective sublayer 1393 surrounds the housing 13 and covers at least a portion of the area corresponding to the groove 13337, while also covering other portions of the housing 13 where the groove 13337 is not formed. These "other portions of the housing 13 where the groove 13337 is not formed" may or may not be covered by the first protective sublayer 1391. It can be understood that, in this case, the second protective sublayer 1393 can provide protection for a wider area of ​​the housing 13.

[0059] In the casing structure 10 of the battery 100 of this application, a groove 13337 is formed in the side wall 133 of the casing 13. A first protective sub-layer 1391 and a second protective sub-layer 1393 are disposed on the outer surface of the casing 13 to protect the casing 13. The first protective sub-layer 1391 at least covers the outer surface of the groove 13337 to protect the relatively weak area where the groove 13337 is located. The second protective sub-layer 1393 at least covers the first protective sub-layer 1391 to protect the first protective sub-layer 1391, thereby further enhancing the protective effect on the area where the groove 13337 is located. At this time, the contact between external humid air and other corrosive media and the area of ​​the casing 13 where the groove 13337 is located is blocked, and corrosion of the casing 13 is not easily caused. The structural integrity and reliability of the casing 13 are better, and the service life and safety of the battery 100 are effectively guaranteed.

[0060] Please refer to Figures 1 to 3 In some embodiments, the sidewall 133 includes a body portion 1331, a coiled portion 1333, and a crimping portion 1335. In a direction away from the bottom wall 131, the body portion 1331, the coiled portion 1333, and the crimping portion 1335 are sequentially connected. The coiled portion 1333 protrudes relative to the body portion 1331 toward the center of the housing structure 10, forming a groove 13337. The coiled portion 1333 and the crimping portion 1335 together form the receiving cavity 1337. The crimping portion 1335 includes a first sub-part 13351 and a second sub-part 13353. The opposite ends of the first sub-part 13351 are connected to the coiled portion 1333 and the second sub-part 13353, respectively. The second sub-part 13353 is spaced apart from the bottom wall 131. The housing structure 10 also includes a sealing ring 15, which is housed within the receiving cavity 1337 and seals the housing structure 10.

[0061] In the above embodiment, the body portion 1331 is the main structure of the sidewall 133. The body portion 1331 is connected to the periphery of the bottom wall 131 and extends from the periphery of the bottom wall 131. The rolled portion 1333 is a structure formed by the shell 13 through a grooving process. The rolled portion 1333 is connected to the side of the body portion 1331 away from the bottom wall 131 and protrudes relative to the body portion 1331 in a direction closer to the center of the shell structure 10, such as... Figure 2 and Figure 3 As shown in (A). It can be understood that, as described above, the function of the coiling part 1333 includes, but is not limited to: fixing the electrode assembly 30 by restricting the position of the electrode assembly 30 in the height direction Z, fixing the busbar structure (the busbar plate 50 described below) by restricting the position of the busbar structure in the height direction Z, and achieving a sealing fit between the housing 13 and the cover plate 11.

[0062] The crimping portion 1335 is a structure in the side wall 133 used to assist in the connection between the housing 13 and the cover plate 11. The coiled portion 1333 and the crimping portion 1335 are connected to the side away from the main body portion 1331. In the height direction Z, away from the bottom wall 131, the main body portion 1331, the coiled portion 1333, and the crimping portion 1335 are sequentially distributed and interconnected. In this application, the spatial structure formed by the coiled portion 1333 and the crimping portion 1335 is positioned in the receiving cavity 1337, as shown below. Figure 3 As shown.

[0063] The first sub-part 13351 is at least a partial structure connecting the crimping part 1335 and the coiling part 1333. The second sub-part 13353 is a structure in the crimping part 1335 used to cooperate with the coiling part 1333 to jointly fix the cover plate 11. It should be noted that the body part 1331, the coiling part 1333, the first sub-part 13351, and the second sub-part 13353 are generally an integral structure and are formed by steps such as the groove 13337 of the housing 13 and the snap-fit ​​with the cover plate 11. The forming steps of the coiling part 1333 will be described in detail below. The first sub-part 13351 is bent and connected to the coiling part 1333. In the extending direction of the first sub-part 13351, the first sub-part 13351 includes two opposite ends, one end of which is connected to the coiling part 1333, and the other end of which is connected to the second sub-part 13353. The second sub-part 13353 is bent and connected to the first sub-part 13351, and the second sub-part 13353 is at least partially spaced from the coiled part 1333 and spaced from the bottom wall 131.

[0064] The sealing ring 15 is an element used to seal the housing structure 10. In some embodiments, the sealing ring 15 is used to seal the gap between the cover plate 11 and the housing 13. The sealing ring 15 is disposed in the receiving cavity 101 and between the cover plate 11 and the housing 13. Exemplarily, the sealing ring 15 may be made of at least one of the following materials: rubber, silicone, plastic, or synthetic fiber. The rubber material includes, but is not limited to, natural rubber, nitrile rubber, fluororubber, polyurethane rubber, EPDM rubber, or silicone rubber. The sealing ring 15 can prevent external impurities, such as dust and water vapor, from entering the interior through the gap between the cover plate 11 and the housing 13, and can also prevent electrolyte from leaking to the outside through the gap between the cover plate 11 and the housing 13, thus ensuring the service life of the battery 100.

[0065] Therefore, in the housing structure 10 of this application, the coiled portion 1333 and the crimping portion 1335 cooperate to form the receiving cavity 1337. The sealing ring 15 is housed in the receiving cavity 1337 and seals the housing structure 10. At this time, the structural reliability and stability of the housing structure 10 are good, and the housing structure 10 has good airtightness, which helps to ensure the safety and service life of the battery 100.

[0066] Please refer to Figures 1 to 3 In some embodiments, the first protective sublayer 1391 also covers at least a portion of the outer surface of the crimping portion 1335, and the second protective sublayer 1393 completely covers the first protective sublayer 1391 and extends to at least a portion of the outer surface of the crimping portion 1335.

[0067] In the above embodiments, it can be understood that during the molding process of the crimping portion 1335, at least a portion of the shell 13 forming the crimping portion 1335 is also deformed under the action of external force to present a preset shape. This molding process may cause microcracks or local damage to the original protective layer (such as the nickel layer) on the surface of the crimping portion 1335, thereby reducing the corrosion resistance of the crimping portion 1335 and thus weakening the stability and reliability of the shell structure 10. At this time, in order to provide protection for the crimping portion 1335, this application expands the setting range of the first protective sub-layer 1391 to cover at least a portion of the outer surface of the crimping portion 1335, so that the first protective sub-layer 1391 can provide reliable protection for all areas of the shell 13 that may be corroded.

[0068] Meanwhile, to ensure that the second protective sublayer 1393 fully protects the first protective sublayer 1391, the second protective sublayer 1393 has a relatively large coverage area, completely covering the first protective sublayer 1391 and extending to at least part of the outer surface of the crimping portion 1335. In this case, the second protective sublayer 1393 seals the edge of the first protective sublayer 1391 on the crimping portion 1335, which helps prevent external corrosive media from entering between the second protective sublayer 1393 and the housing 13 through gaps, ensuring that the second protective sublayer 1393 fully seals and protects the first protective sublayer 1391 and at least part of the housing 13.

[0069] Therefore, in the housing structure 10 of this application, the first protective sub-layer 1391 extends to cover at least a portion of the outer surface of the pressing portion 1335, and the second protective sub-layer 1393, while completely covering the first protective sub-layer 1391, also extends to cover at least a portion of the outer surface of the pressing portion 1335. At this time, the first protective sub-layer 1391 and the second protective sub-layer 1393 work together to provide sufficient protection for the weak areas of the housing 13 over a larger area. In this case, external corrosive media are less likely to cause corrosion of the housing 13, thus fully ensuring the structural integrity and reliability of the housing 13 and effectively improving the service life and safety of the battery 100.

[0070] Please refer to Figures 1 to 3 In some embodiments, the first protective sublayer 1391 covers at least a portion of the outer surface of the body portion 1331, and the second protective sublayer 1393 completely covers the first protective sublayer 1391 and extends to at least a portion of the outer surface of the body portion 1331.

[0071] In the above embodiments, it is understood that if the body portion 1331 is exposed to the external environment, the original protective layer (such as the nickel layer) on the surface of the body portion 1331 may be partially damaged due to external forces such as scratches during long-term use. In order to provide protection for the body portion 1331, this application expands the range of the first protective sub-layer 1391 to cover at least part of the outer surface of the body portion 1331, so that the first protective sub-layer 1391 can provide reliable protection for all areas of the housing 13 that may be corroded.

[0072] Meanwhile, to ensure that the second protective sublayer 1393 fully protects the first protective sublayer 1391, the second protective sublayer 1393 has a relatively large coverage area, completely covering the first protective sublayer 1391 and extending to at least a portion of the outer surface of the body portion 1331. In this case, the second protective sublayer 1393 seals the edge of the first protective sublayer 1391 on the body portion 1331, which helps prevent external corrosive media from entering between the second protective sublayer 1393 and the shell 13 through gaps, ensuring that the second protective sublayer 1393 fully seals and protects the first protective sublayer 1391 and at least a portion of the shell 13.

[0073] Therefore, in the housing structure 10 of this application, the first protective sub-layer 1391 extends to cover at least a portion of the outer surface of the main body 1331, and the second protective sub-layer 1393, while completely covering the first protective sub-layer 1391, also extends to cover at least a portion of the outer surface of the main body 1331. At this time, the first protective sub-layer 1391 and the second protective sub-layer 1393 work together to provide multi-directional and multi-area protection for the housing 13, greatly reducing the potential corrosion of the housing 13 by external corrosive media, and significantly improving the service life and safety of the battery 100.

[0074] Please refer to Figures 1 to 3 In some embodiments, the thickness T1 of the first protective sublayer 1391 and the thickness T of the shell 13 satisfy: 0.2≤T1 / T≤1.0.

[0075] It is understood that this application defines the thickness of the first protective sublayer 1391 as thickness T1, and the thickness of the shell 13 as thickness T, as follows. Figure 3As shown in the enlarged view in (A), the ratio of the thickness T1 of the first protective sublayer 1391 to the thickness T of the shell 13 determines the shape of both the first protective sublayer 1391 and the shell 13. This ratio may affect the protective effect of the first protective sublayer 1391 on the shell 13, and may also affect the structural rationality of the shell structure 10, ultimately impacting key parameters such as the energy density of the battery 100. It can be understood that the thickness T1 of the first protective sublayer 1391 and the thickness T of the shell 13 determine the synergistic effect between the shell 13 and the first protective sublayer 1391, and directly relates to the overall performance of the battery 100.

[0076] The ratio of the thickness T1 of the first protective sublayer 1391 to the thickness T of the shell 13 can be, but is not limited to, any one or any two of 0.2, 0.25, 0.3, 0.4, 0.45, 0.5, 0.6, 0.7, 0.8, 0.9, and 1.0. When the thickness T1 of the first protective sublayer 1391 and the thickness T of the shell 13 satisfy the above ranges, both the thickness T1 of the first protective sublayer 1391 and the thickness T of the shell 13 are suitable. The first protective sublayer 1391 can fully exert its protective performance, and the manufacturing difficulty and processing cost are also suitable. Furthermore, the thickness and mass of the overall structure formed by the shell 13 and the first protective sublayer 1391 are suitable, which is beneficial for the miniaturization design of the battery 100, and the battery 100 can have a high energy density and good practicality.

[0077] Please refer to Figures 1 to 3 In some embodiments, the thickness T1 of the first protective sublayer 1391 and the thickness T of the shell 13 satisfy: 0.4≤T1 / T≤0.6.

[0078] As mentioned above, the thickness T1 of the first protective sublayer 1391 and the thickness T of the shell 13 together determine the protective effect of the first protective sublayer 1391 on the shell 13 and the structural rationality of the shell structure 10, thereby determining key parameters such as the energy density of the battery 100. In some embodiments, the ratio of the thickness T1 of the first protective sublayer 1391 to the thickness T of the shell 13 can be, but is not limited to, any one or any two of 0.4, 0.42, 0.45, 0.46, 0.48, 0.5, 0.52, 0.55, 0.56, and 0.6.

[0079] When the thickness T1 of the first protective sublayer 1391 and the thickness T of the casing 13 satisfy the above-mentioned range, the thickness T1 of the first protective sublayer 1391 and the thickness T of the casing 13 are further optimized. At this time, while ensuring the excellent and reliable protective performance of the first protective sublayer 1391, the first protective sublayer 1391 also has the advantages of lower manufacturing difficulty and processing cost. At the same time, since the overall structure formed by the casing 13 and the first protective sublayer 1391 has a low thickness and weight, the battery 100 can be designed with a larger capacity and has better practicality.

[0080] Please refer to Figures 1 to 3 In some embodiments, the thickness T of the housing 13 satisfies: 0.1mm≤T≤0.6mm.

[0081] It is understood that the casing 13 is mainly used to provide structural support for the casing structure 10. The thickness T of the casing 13 directly affects the structural strength, economic performance, and energy density of the battery 100. The thickness T of the casing 13 can be, but is not limited to, any one or any two of the following: 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, and 0.6mm. When the thickness T of the casing 13 meets the above range, the thickness T of the casing 13 is more suitable, the structural strength of the casing 13 is greater, the casing 13 is less likely to break during the production process, the yield rate of the casing structure 10 is higher, and the casing 13 also has greater structural strength in subsequent use, resulting in better structural reliability and service life of the battery 100. Furthermore, within the same volume of the housing structure 10, the housing 13 does not excessively compress the internal space of the housing structure 10, the electrode assembly 30 can be set to a larger maximum size, the battery 100 has a higher energy density, and the battery 100 has better portability and practicality.

[0082] Please refer to Figures 1 to 3 In some embodiments, the thickness T of the housing 13 satisfies: 0.2mm≤T≤0.5mm.

[0083] As mentioned above, the thickness T of the housing 13 determines the structural strength, economic performance, and energy density of the housing structure 10 and the battery 100. In some embodiments, the thickness T of the housing 13 may be, but is not limited to, any one or any two of 0.2 mm, 0.23 mm, 0.25 mm, 0.28 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.49 mm, and 0.5 mm.

[0084] With the thickness T of the housing 13 meeting the above-mentioned range, the thickness T of the housing 13 is further optimized. This ensures that the housing 13 has high structural strength and good structural stability, and that the yield rate of the housing structure 10 is high, so that the battery 100 has excellent structural reliability and a long service life. In addition, the housing 13 provides ample layout space for the electrode assembly 30, greatly optimizing the energy density of the battery 100 and ensuring that the battery 100 is both portable and practical.

[0085] Please refer to Figures 1 to 3 In some embodiments, the first protective sublayer 1391 is at least one of an organosilicon layer, a polyurethane layer, an epoxy resin layer, and a photocurable layer; when the first protective sublayer 1391 is an organosilicon layer, the thickness T1 of the first protective sublayer 1391 satisfies: 0.1mm ≤ T1 ≤ 0.5mm; when the first protective sublayer 1391 is a polyurethane layer or an epoxy resin layer, the thickness T1 of the first protective sublayer 1391 satisfies: 0.05mm ≤ T1 ≤ 0.50mm; when the first protective sublayer 1391 is a photocurable layer, the thickness T1 of the first protective sublayer 1391 satisfies: 0.05mm ≤ T1 ≤ 0.30mm.

[0086] In the above embodiments, the first protective sublayer 1391 may be, but is not limited to, at least one of an organosilicon layer, a polyurethane layer, an epoxy resin layer, and a photocurable layer, wherein... The silicone layer, with silicon-oxygen bonds as its main chain, possesses excellent hydrophobicity, effectively blocking the penetration of water molecules and corrosive ions. Simultaneously, its good flexibility allows it to adapt to at least part of the molding process of the casing 13 after the grooving process, as well as localized deformation during use, without easily cracking. At this point, the thickness T1 of the first protective sub-layer 1391 relates to the molding process of the silicone layer, the protective effect of the first protective sub-layer 1391 on the casing 13, and also to the portability and economy of the battery 100. The thickness T1 of the first protective sub-layer 1391 can be, but is not limited to, any one or any two of the following: 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.48mm, and 0.5mm. When the thickness T1 of the first protective sublayer 1391 of the organosilicon layer meets the above range, the thickness T1 of the first protective sublayer 1391 is more suitable. The molding process of the first protective sublayer 1391 is simple and the yield rate is high. The first protective sublayer 1391 can provide good protection for the shell 13. At the same time, the thickness and weight of the first protective sublayer 1391 are both more suitable. The overall size and weight of the battery 100 are smaller, the battery 100 has better portability and lower processing cost.

[0087] The polyurethane layer possesses high elasticity and wear resistance, providing excellent cushioning at the stress concentration point of groove 13337. Simultaneously, the dense cross-linked network within the polyurethane layer exhibits good resistance to acidic and alkaline media, effectively protecting against various corrosive media. Therefore, the thickness T1 of the first protective sub-layer 1391 affects the molding process of the polyurethane layer, the protective effect of the first protective sub-layer 1391 on the casing 13, and also influences the portability and economy of the battery 100. The thickness T1 of the first protective sub-layer 1391 can be, but is not limited to, any one or any two of the following: 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.48mm, and 0.5mm. When the thickness T1 of the first protective sublayer 1391 of the polyurethane layer meets the above range, the thickness T1 of the first protective sublayer 1391 is more suitable. The molding process of the first protective sublayer 1391 is simple and the yield rate is high. The first protective sublayer 1391 can provide good protection for the shell 13. At the same time, the thickness and weight of the first protective sublayer 1391 are both more suitable. The overall size and weight of the battery 100 are smaller, the battery 100 has better portability and lower processing cost.

[0088] The epoxy resin layer contains polar hydroxyl groups and ether bonds, exhibiting strong adhesion to the metal casing 13. After curing, the epoxy resin layer forms a rigid barrier with high cross-linking density, significantly delaying the diffusion of corrosive media such as chloride ions, and providing stable and reliable protection during long-term use. At this point, the thickness T1 of the first protective sub-layer 1391 is related to the molding process of the epoxy resin layer, the protective effect of the first protective sub-layer 1391 on the casing 13, and also to the portability and economy of the battery 100. The thickness T1 of the first protective sub-layer 1391 can be, but is not limited to, any one or any two of the following: 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.48 mm, and 0.5 mm. When the thickness T1 of the first protective sublayer 1391 of the epoxy resin layer meets the above range, the thickness T1 of the first protective sublayer 1391 is more suitable. The molding process of the first protective sublayer 1391 is simple and the yield rate is high. The first protective sublayer 1391 can provide good protection for the shell 13. At the same time, the thickness and weight of the first protective sublayer 1391 are both more suitable. The overall size and weight of the battery 100 are smaller, the battery 100 has better portability and lower processing cost.

[0089] The photocurable layer forms a film rapidly based on free radical or cationic polymerization, exhibiting extremely high curing efficiency and surface smoothness. It has low curing shrinkage, adjustable hardness, and high density, enabling it to repair discontinuous structures such as localized cracks. In this case, the thickness T1 of the first protective sublayer 1391 affects the forming process of the photocurable layer, the protective effect of the first protective sublayer 1391 on the casing 13, and the portability and economy of the battery 100. The thickness T1 of the first protective sublayer 1391 can be, but is not limited to, any one or any two of the following: 0.05 mm, 0.08 mm, 0.1 mm, 0.15 mm, 0.18 mm, 0.2 mm, 0.22 mm, 0.25 mm, 0.27 mm, 0.28 mm, and 0.3 mm. When the thickness T1 of the first protective sublayer 1391 of the photocurable layer meets the above range, the thickness T1 of the first protective sublayer 1391 is more suitable. The molding process of the first protective sublayer 1391 is simple and the yield rate is high. The first protective sublayer 1391 can provide good protection for the shell 13. At the same time, the thickness and weight of the first protective sublayer 1391 are both more suitable. The overall size and weight of the battery 100 are small, the battery 100 has good portability and low processing cost.

[0090] Please refer to Figures 1 to 3 In some embodiments, the first protective sublayer 1391 is at least one of an organosilicon layer, a polyurethane layer, an epoxy resin layer, and a photocurable layer; when the first protective sublayer 1391 is an organosilicon layer, the thickness T1 of the first protective sublayer 1391 satisfies: 0.2mm ≤ T1 ≤ 0.4mm; when the first protective sublayer 1391 is a polyurethane layer or an epoxy resin layer, the thickness T1 of the first protective sublayer 1391 satisfies: 0.20mm ≤ T1 ≤ 0.35mm; when the first protective sublayer 1391 is a photocurable layer, the thickness T1 of the first protective sublayer 1391 satisfies: 0.10mm ≤ T1 ≤ 0.25mm.

[0091] As mentioned above, when the first protective sublayer 1391 is an organosilicon layer, the thickness T1 of the first protective sublayer 1391 determines the molding process of the organosilicon layer and the protective effect of the first protective sublayer 1391 on the casing 13, thereby directly determining the reliability, portability, and economy of the battery 100. In some embodiments, the thickness T1 of the first protective sublayer 1391 can be, but is not limited to, any one or any two of 0.2mm, 0.22mm, 0.25mm, 0.28mm, 0.3mm, 0.33mm, 0.35mm, 0.36mm, 0.38mm, and 0.4mm.

[0092] When the thickness T1 of the first protective sublayer 1391 of the organosilicon layer meets the above-mentioned range, the thickness T1 of the first protective sublayer 1391 is further optimized. At this time, the molding process of the first protective sublayer 1391 has the advantages of simple process and high yield, and ensures that the first protective sublayer 1391 has excellent protective effect and the battery 100 has excellent working reliability. At the same time, the first protective sublayer 1391 will not degrade the overall size and weight of the battery 100, effectively ensuring the portability and economy of the battery 100.

[0093] As mentioned above, when the first protective sub-layer 1391 is a polyurethane layer or an epoxy resin layer, the thickness T1 of the first protective sub-layer 1391 determines the molding process of the polyurethane layer or epoxy resin layer, as well as the protective effect of the first protective sub-layer 1391 on the casing 13, and thus directly determines the reliability, portability, and economy of the battery 100. In some embodiments, the thickness T1 of the first protective sub-layer 1391 may be, but is not limited to, any one or any two of 0.2mm, 0.22mm, 0.25mm, 0.28mm, 0.3mm, 0.31mm, 0.32mm, 0.34mm, 0.34mm, and 0.35mm.

[0094] When the thickness T1 of the first protective sublayer 1391 of the polyurethane layer or epoxy resin layer meets the above-mentioned range, the thickness T1 of the first protective sublayer 1391 is further optimized. At this time, the molding process of the first protective sublayer 1391 has the advantages of simple process and high yield, and ensures that the first protective sublayer 1391 has excellent protective effect and the battery 100 has excellent working reliability. At the same time, the first protective sublayer 1391 will not degrade the overall size and weight of the battery 100, effectively ensuring the portability and economy of the battery 100.

[0095] As mentioned above, when the first protective sublayer 1391 is a photocurable layer, the thickness T1 of the first protective sublayer 1391 determines the forming process of the photocurable layer and the protective effect of the first protective sublayer 1391 on the casing 13, thereby directly determining the reliability, portability, and economy of the battery 100. In some embodiments, the thickness T1 of the first protective sublayer 1391 may be, but is not limited to, any one or any two of 0.1mm, 0.12mm, 0.14mm, 0.15mm, 0.18mm, 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, and 0.25mm.

[0096] When the thickness T1 of the first protective sublayer 1391 of the photocurable layer meets the above-mentioned range, the thickness T1 of the first protective sublayer 1391 is further optimized. At this time, the molding process of the first protective sublayer 1391 has the advantages of simple process and high yield, and ensures that the first protective sublayer 1391 has excellent protective effect and the battery 100 has excellent working reliability. At the same time, the first protective sublayer 1391 will not degrade the overall size and weight of the battery 100, effectively ensuring the portability and economy of the battery 100.

[0097] Please refer to Figures 1 to 3 In some embodiments, the thickness T2 of the second protective sublayer 1393 satisfies: 0.05mm≤T2≤0.40mm.

[0098] In the above embodiments, it can be understood that since the second protective sub-layer 1393 is located on the outermost side and is in direct contact with the external environment, the thickness T2 of the second protective sub-layer 1393 is related to the structural strength of the second protective sub-layer 1393, the protective effect on the first protective sub-layer 1391 and the casing 13, and the portability and economy of the battery 100. The thickness T2 of the second protective sub-layer 1393 can be, but is not limited to, any one or any two of 0.05mm, 0.1mm, 0.12mm, 0.15mm, 0.2mm, 0.25mm, 0.28mm, 0.3mm, 0.35mm, and 0.4mm. When the thickness T2 of the second protective sublayer 1393 meets the above-mentioned range, the thickness T2 of the second protective sublayer 1393 is more suitable. The second protective sublayer 1393 has good structural strength and is not easily deformed or damaged due to external forces. The second protective sublayer 1393 can provide good protection for the first protective sublayer 1391 and the shell 13. At the same time, since the thickness and weight of the second protective sublayer 1393 are both more suitable, the overall size and weight of the battery 100 are smaller, the battery 100 has better portability and lower processing cost.

[0099] Please refer to Figures 1 to 3 In some embodiments, the thickness T2 of the second protective sublayer 1393 satisfies: 0.10mm≤T2≤0.30mm.

[0100] As mentioned above, the thickness T2 of the second protective sublayer 1393 determines the structural strength of the second protective sublayer 1393, the protective effect on the first protective sublayer 1391 and the casing 13, and thus directly determines the reliability, portability and economy of the battery 100. In some embodiments, the thickness T2 of the second protective sublayer 1393 may be, but is not limited to, any one or any two of 0.1mm, 0.12mm, 0.14mm, 0.15mm, 0.2mm, 0.24mm, 0.25mm, 0.26mm, 0.28mm and 0.3mm.

[0101] When the thickness T2 of the second protective sublayer 1393 meets the above-mentioned range, the thickness T2 of the second protective sublayer 1393 is further optimized. At this time, the structural strength and operational reliability of the second protective sublayer 1393 are ensured, so as to ensure that the second protective sublayer 1393 can provide stable and reliable protection for the first protective sublayer 1391 and the casing 13, thereby giving the battery 100 excellent operational reliability. At the same time, since the second protective sublayer 1393 does not degrade the overall size and weight of the battery 100, the portability and economy of the battery 100 are effectively guaranteed.

[0102] Please refer to Figures 1 to 3 In some embodiments, the second protective sublayer 1393 is at least one of a polyvinyl chloride layer, a polyethylene terephthalate layer, and a polyimide layer.

[0103] When the second protective sublayer 1393 is a polyvinyl chloride (PVC) layer, it possesses excellent flame retardancy, electrical insulation, and chemical corrosion resistance. Furthermore, it is cost-effective and has moderate flexibility. By using the second protective sublayer 1393 to surround the casing 13, it effectively buffers external impacts due to its good fit and damping characteristics. Simultaneously, its flame retardant properties enhance the safety of the battery 100, and its excellent economic efficiency helps reduce the overall processing cost of the battery 100.

[0104] When the second protective sublayer 1393 is a polyethylene terephthalate (PET) layer, it possesses high tensile strength and dimensional stability, significantly enhancing the shell 13's resistance to circumferential stress, suppressing deformation, and thus contributing to the structural integrity and stability of the battery 100. Simultaneously, the second protective sublayer 1393 exhibits good heat resistance and moisture permeability, making it particularly suitable for shell structures 10 used in outdoor or humid environments.

[0105] When the second protective sublayer 1393 is a polyimide (PI) layer, it possesses excellent high and low temperature resistance (long-term operating temperature range of -269℃ to 400℃), superior mechanical strength and dielectric properties, and the polyimide layer exhibits outstanding radiation resistance and solvent resistance. In this case, the polyimide layer provides structural stability to the casing 13 under extreme temperature conditions, and its excellent dielectric strength provides a high-voltage insulation barrier. Furthermore, it has extremely long resistance to radiation aging, making it suitable for protecting the battery 100 in demanding applications such as aerospace, deep wells, or high-power electrical equipment.

[0106] Please refer to Figures 1 to 3 In some embodiments, the housing 13 includes a base layer 1355 and a functional layer 1358. The base layer 1355 includes an inner surface 13551 and an outer surface 13553 that are opposite to each other in the thickness direction of the housing 13. The functional layer 1358 covers the inner surface 13551 and / or the outer surface 13553. The thickness T1 of the first protective sublayer 1391 and the thickness T3 of the functional layer 1358 satisfy: 5T3≤T1.

[0107] The substrate layer 1355 is the core structure of the shell 13 and is commonly referred to as the "base material". The substrate layer 1355 can be made of, but is not limited to, steel, aluminum alloy, stainless steel, or titanium alloy. The functional layer 1358 is a structure in the shell 13 used to protect the substrate layer 1355 and improve the overall performance of the shell 13. In the thickness direction of the substrate layer 1355, i.e., the thickness direction of the shell 13, the substrate layer 1355 includes an inner surface 13551 and an outer surface 13553. The inner surface 13551 is opposite to the outer surface 13553, wherein the inner surface 13551 is closer to the interior of the shell 13 than the outer surface 13553, and the outer surface 13553 is closer to the exterior of the shell 13 than the inner surface 13551.

[0108] The functional layer 1358 is positioned on the inner surface 13551 and / or the outer surface 13553. For example, please refer to... Figure 2 The enlarged view shows a partial illustration, illustrating the placement of functional layer 1358 on both the inner surface 13551 and the outer surface 13553. In this configuration, functional layer 1358 effectively prevents the substrate layer 1355 from contacting the electrolyte within the battery 100 and the external environment, thus avoiding chemical and / or electrochemical corrosion of the substrate layer 1355 due to contact with external corrosive media and the electrolyte. It also strengthens the substrate layer 1355. It can be understood that functional layer 1358, whether only on the inner surface 13551 or only on the outer surface 13553, can respectively prevent the substrate layer 1355 from contacting the electrolyte within the battery 100 or from contacting the external environment. The material of the functional layer 1358 can be, but is not limited to, zirconium, titanium, nickel alloy, etc. The substrate layer 1355 and the functional layer 1358 can be combined by means of composite rolling, electroplating, physical deposition, or mechanical nesting. In some embodiments, the substrate layer 1355 is a steel layer and the functional layer 1358 is a nickel layer. The steel (such as cold-rolled steel strip) provides high mechanical strength and effectively suppresses the bulging deformation of the battery 100 at the end of the cycle; the nickel (such as pure nickel or nickel-plated layer) has excellent corrosion resistance and can prevent perforation of the casing 13 or electrolyte leakage due to corrosion.

[0109] The thickness T1 of the first protective sublayer 1391 and the thickness T3 of the functional layer 1358 determine the structural rationality of the functional layer 1358 and the first protective sublayer 1391, the difficulty and cost of the molding process, and the protective effect on the substrate layer 1355. The ratio of the thickness T1 of the first protective sublayer 1391 to the thickness T3 of the functional layer 1358 can be, but is not limited to, any one of 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, and 9.5, any value between any two of these values, or any value within the range of the above values. When the thickness T1 of the first protective sublayer 1391 and the thickness T3 of the functional layer 1358 meet the above-mentioned ranges, the thickness T1 of the first protective sublayer 1391 and the thickness T3 of the functional layer 1358 are both suitable. The first protective sublayer 1391 and the functional layer 1358 can work together to ensure the protective performance of the substrate layer 1355. Moreover, the process difficulty and processing cost of the first protective sublayer 1391 and the functional layer 1358 are suitable. In addition, the thickness and weight of the overall structure formed by the first protective sublayer 1391, the functional layer 1358 and the substrate layer 1355 are suitable, which is conducive to the miniaturization design of the battery 100. The battery 100 can have good portability and economic performance.

[0110] Therefore, in the housing structure 10 of this application, the housing 13 includes a base layer 1355 and a functional layer 1358 that simultaneously covers the inner surface 13551 and the outer surface 13553 of the functional layer 1358. At this time, the structural reliability and corrosion resistance of the housing 13 are better. Meanwhile, when the thickness T1 of the first protective sub-layer 1391 and the thickness T3 of the functional layer 1358 satisfy 5T3≤T1, the first protective sub-layer 1391 and the functional layer 1358 jointly improve the protection performance of the base layer 1355. Moreover, the process difficulty, processing cost, thickness and quality of the first protective sub-layer 1391 and the functional layer 1358 are suitable, and the portability and economic performance of the battery 100 are significantly improved.

[0111] Please refer to Figures 1 to 3 In some embodiments, the opening size W of the groove 13337 in the axial direction of the housing 13 satisfies: 0 <W≤4mm。

[0112] Please refer to Figure 3In the enlarged schematic diagram in (A), the groove 13337 has an inlet 13339 in the direction towards the outside of the shell structure 10. Since the second protective sublayer 1393 at least covers the first protective sublayer 1391, the second protective sublayer 1393 closes this inlet 13339 to prevent the first protective sublayer 1391 attached to the inner wall of the groove 13337 from directly contacting the external environment through the inlet 13339.

[0113] This application defines the axial dimension of the inlet 13339 in the housing 13 as the opening size W, such as... Figure 3 As shown in (A), it can be understood that the opening size W of the groove 13337 determines the shape of the groove 13337 and affects the forming quality of the groove 13337 and the structural strength of the shell 13. The opening size W of the groove 13337 can be, but is not limited to, any one or any two of 0.05mm, 0.1mm, 0.12mm, 0.15mm, 0.2mm, 0.25mm, 0.28mm, 0.3mm, 0.35mm and 0.4mm.

[0114] When the opening size W of the groove 13337 meets the above-mentioned range, the opening size W of the groove 13337 is more suitable. This helps to ensure that the metal shell 13 obtains a uniform strain distribution during the forming process, avoids stress concentration, and thus significantly improves the dimensional repeatability of the groove 13337 and the contour consistency of the shell 13. At the same time, this dimensional condition helps to ensure the rationality of the shape of the coiled part 1333 and is conducive to the reliable positioning of structures such as the electrode assembly 30 during subsequent assembly, which helps to improve the process stability and reliability of the battery 100.

[0115] Please refer to Figures 1 to 3 In some embodiments, the maximum distance D1 between the outer side of the groove 13337 and the connection point between the crimping portion 1335 and the coiling portion 1333 in the radial direction of the housing 13 satisfies: 0 <D1≤6mm。

[0116] Please refer to Figure 3 In the enlarged schematic diagram in (A), the groove 13337 corresponds to at least a partially curved outer surface of the housing 13. At this time, in the radial direction of the housing 13, the groove 13337 corresponding to the at least partially curved outer surface of the housing 13 is recessed towards the interior of the housing 13 relative to the outer surface of the housing 13 corresponding to the body portion 1331, and is at a certain distance from the connection point between the crimping portion 1335 and the coiling portion 1333. It should be noted that the connection point between the crimping portion 1335 and the coiling portion 1333 is directly opposite the connection point between the body portion 1331 and the coiling portion 1333 in the height direction, as shown below. Figure 3 The dashed line is shown in the Z-direction parallel to the height.

[0117] In this application, the maximum distance in the radial direction of the outer side surface corresponding to the groove 13337 and the connection point between the crimping part 1335 and the coiling part 1333 is defined as the maximum distance D1. Figure 3 As shown in (A), the maximum distance D1 is the vertical distance from the point furthest from the dashed line on the outer side of the groove 13337 in the vertical height direction Z to the dashed line. It can be understood that the maximum distance D1 is the maximum depth of the groove 13337 in the vertical height direction Z, thus determining the shape of the groove 13337 and affecting its forming quality and the structural strength of the shell 13. The maximum distance D1 can be, but is not limited to, any one or any two of 0.1mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, and 0.6mm.

[0118] When the maximum distance D1 in the radial direction of the housing 13 at the connection point between the outer side of the groove 13337 and the connection point between the pressing part 1335 and the coiling part 1333 meets the above-mentioned range, the maximum distance D1 is more suitable. This helps ensure that the metal housing 13 obtains a uniform strain distribution during the forming process, avoids stress concentration, and thus significantly improves the dimensional repeatability of the groove 13337 and the contour consistency of the housing 13. At the same time, this dimensional condition helps ensure the rationality of the shape of the coiling part 1333 and is conducive to the reliable positioning of structures such as the electrode assembly 30 during subsequent assembly, which is beneficial to improving the process stability and reliability of the battery 100.

[0119] Please refer to Figures 1 to 3 In some embodiments, the radial distance D2 from the first protective sublayer 1391 to the crimping portion 1335 satisfies: 0.5mm ≤ D2 ≤ 4mm.

[0120] As described above, at least a portion of the first protective sublayer 1391 extends to the crimping portion 1335 to further enhance the protection range of the housing 13, ensuring the structural reliability and service life of the housing structure 10. This application defines the distance from the first protective sublayer 1391 to the crimping portion 1335 in the radial direction of the housing 13 as the radial distance D2. Figure 3 As shown in (A). It should be noted that the radial distance D2 is the distance that the first protective sub-layer 1391 extends radially beyond the connection point between the crimping part 1335 and the coiling part 1333 in the housing 13.

[0121] It is understood that the radial distance D2 determines the coverage area of ​​the first protective sub-layer 1391 over the crimping portion 1335 and affects the protective effect of the first protective sub-layer 1391 on the crimping portion 1335. The radial distance D2 can be, but is not limited to, any one or any two of 0.5mm, 0.6mm, 0.8mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, and 4mm.

[0122] When the radial distance D2 from the first protective sublayer 1391 to the crimping portion 1335 meets the above-mentioned range, the radial distance D2 is more suitable. The first protective sublayer 1391 has a large coverage area of ​​the crimping portion 1335, ensuring that the first protective sublayer 1391 provides sufficient protection for the crimping portion 1335 where there may be weak areas. This effectively prevents corrosive media from corroding the crimping portion 1335, fully protects the structural integrity and reliability of the housing 13, and greatly improves the service life and safety of the battery 100.

[0123] Please refer to Figures 1 to 3 In some embodiments, the axial distance D4 from the first protective sublayer 1391 to the crimping portion 1335 satisfies: 1mm≤D4≤8mm.

[0124] As described above, at least a portion of the first protective sublayer 1391 extends to the crimping portion 1335 to further enhance the protection range of the housing 13, ensuring the structural reliability and service life of the housing structure 10. This application defines the distance from the first protective sublayer 1391 to the crimping portion 1335 along the axial direction of the housing 13 as the axial distance D4. Figure 3 As shown in (A). It should be noted that the axial distance D4 is the distance that the first protective sub-layer 1391 extends beyond the connection point between the crimping part 1335 and the coiling part 1333 in the axial direction of the housing 13.

[0125] It is understood that the axial distance D4 determines the coverage area of ​​the first protective sub-layer 1391 over the crimping portion 1335 and affects the protective effect of the first protective sub-layer 1391 on the crimping portion 1335. The radial distance D2 can be, but is not limited to, any one or any two of 1mm, 2mm, 3mm, 4mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, and 8mm.

[0126] When the axial distance D4 from the first protective sublayer 1391 to the crimping portion 1335 meets the above-mentioned range, the axial distance D4 is more suitable. The first protective sublayer 1391 has a large coverage area of ​​the crimping portion 1335, ensuring that the first protective sublayer 1391 provides sufficient protection for the crimping portion 1335 where there may be weak areas. This effectively prevents corrosive media from corroding the crimping portion 1335, fully guarantees the structural integrity and reliability of the housing 13, and greatly improves the service life and safety of the battery 100.

[0127] Please refer to Figures 1 to 3 In some embodiments, the radial distance D3 from the first protective sublayer 1391 to the body portion 1331 satisfies: 0.5mm≤D3≤4mm.

[0128] As described above, at least a portion of the first protective sublayer 1391 extends into the body portion 1331 to further enhance the protection range of the housing 13, ensuring the structural reliability and service life of the housing structure 10. This application defines the distance from the first protective sublayer 1391 to the body portion 1331 in the radial direction of the housing 13 as the radial distance D3. Figure 3 As shown in (A). It should be noted that the radial distance D3 is the distance that the first protective sub-layer 1391 extends radially beyond the connection point between the main body 1331 and the coiled part 1333 in the housing 13.

[0129] It is understood that the radial distance D3 determines the coverage area of ​​the first protective sublayer 1391 over the main body 1331 and affects the protective effect of the first protective sublayer 1391 on the main body 1331. The radial distance D3 can be, but is not limited to, any one or any two of 0.5mm, 0.6mm, 0.8mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm and 4mm.

[0130] When the radial distance D3 from the first protective sublayer 1391 to the main body 1331 meets the above-mentioned range, the radial distance D3 is more suitable. The first protective sublayer 1391 covers a large area of ​​the main body 1331, ensuring that the first protective sublayer 1391 provides sufficient protection for multiple areas of the casing 13, effectively preventing the corrosion of the main body 1331 by corrosive media, fully guaranteeing the structural integrity and reliability of the casing 13, and greatly improving the service life and safety of the battery 100.

[0131] Please refer to Figures 1 to 3 In some embodiments, the axial distance D5 from the first protective sublayer 1391 to the body portion 1331 satisfies: 1mm≤D5≤8mm.

[0132] As described above, at least a portion of the first protective sublayer 1391 extends into the body portion 1331 to further enhance the protection range of the housing 13, ensuring the structural reliability and service life of the housing structure 10. This application defines the distance from the first protective sublayer 1391 to the body portion 1331 along the axial direction of the housing 13 as the axial distance D5. Figure 3 As shown in (A). It should be noted that the axial distance D5 is the distance that the first protective sub-layer 1391 extends beyond the connection point between the main body 1331 and the coiled part 1333 in the axial direction of the housing 13.

[0133] It is understood that the axial distance D5 determines the coverage area of ​​the first protective sublayer 1391 over the main body 1331 and affects the protective effect of the first protective sublayer 1391 on the main body 1331. The axial distance D5 can be, but is not limited to, any one or any two of 1mm, 2mm, 3mm, 4mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm and 8mm.

[0134] When the axial distance D5 from the first protective sublayer 1391 to the main body 1331 meets the above-mentioned range, the axial distance D5 is more suitable. The first protective sublayer 1391 covers a large area of ​​the main body 1331, ensuring that the first protective sublayer 1391 provides sufficient protection for multiple areas of the housing 13, effectively preventing the corrosion of the main body 1331 by corrosive media, fully guaranteeing the structural integrity and reliability of the housing 13, and greatly improving the service life and safety of the battery 100.

[0135] Please refer to Figures 1 to 3 In some embodiments, the first protective sublayer 1391 also extends to the outer side of the crimping portion 1335 and / or the outer side of the body portion 1331, and the maximum width Lmax of the first protective sublayer 1391 in the radial direction of the housing 13 and the minimum thickness Tmin of the crimping portion 1333 satisfy: 10Tmin≤Lmax.

[0136] As described above, at least a portion of the first protective sublayer 1391 extends to the coiled portion 1333 and / or the body portion 1331 to further enhance the protection range of the housing 13, ensuring the structural reliability and service life of the housing structure 10. This application defines the maximum width Lmax of the first protective sublayer 1391 in the radial direction of the housing 13 as such. Figure 3As shown in (A), it can be understood that the maximum width Lmax determines the coverage area of ​​the first protective sublayer 1391 over the coiled portion 1333 and / or the main body portion 1331, and affects the protective effect of the first protective sublayer 1391 on the housing 13. At the same time, it also determines the shape of the coiled portion 1333. The ratio of the maximum width Lmax of the first protective sublayer 1391 in the radial direction of the housing 13 to the minimum thickness Tmin of the coiled portion 1333 can be, but is not limited to, any one or any two of 10, 11, 12, 13, 14, 15, 16, 17, 18 and 20, or any value within the range of the above values.

[0137] When the maximum width Lmax of the first protective sublayer 1391 in the radial direction of the housing 13 and the minimum thickness Tmin of the coiled portion 1333 satisfy the above-mentioned range, the setting range of the first protective sublayer 1391 and the shape of the coiled portion 1333 are more suitable. The first protective sublayer 1391 has a large coverage area on the housing 13, and the first protective sublayer 1391 fully plays its role in corrosion prevention. At the same time, the coiled portion 1333 will not squeeze the internal space of the battery 100 due to excessive thickness, which is conducive to ensuring the energy density of the battery 100, thereby ensuring the practicality of the battery 100.

[0138] Please refer to Figures 1 to 3 In some embodiments, the second protective sublayer 1393 surrounds the outer wall 133 of the housing structure 10, the second protective sublayer 1393 extends to the crimp portion 1335 and / or the body portion 1331 of the housing 13, and closes the groove 13337.

[0139] Please refer to Figure 3 (A) In the above embodiment, the second protective sub-layer 1393 is disposed in such a way that it is tightly attached to the periphery of the shell structure 10 and surrounds the outer wall 133 of the shell structure 10. The number of layers of the second protective sub-layer 1393 surrounding the outer wall 133 of the shell structure 10 can be one or more, and this application does not limit this. At this time, the second protective sub-layer 1393 is tightly bonded to the shell 13 and is not easy to fall off.

[0140] When the second protective sublayer 1393 extends to the press-fit portion 1335 and / or the body portion 1331 of the housing 13, the second protective sublayer 1393 surrounds the housing 13 except for the area corresponding to the groove 13337, thus completely shielding and sealing the groove 13337. At this time, a closed cavity exists between the second protective sublayer 1393 and the groove 13337. It can be understood that the second protective sublayer 1393 seals the groove 13337 so that the edge of the second protective sublayer 1393 does not remain suspended in the area corresponding to the groove 13337, thus preventing external corrosive media from entering the groove 13337. Therefore, external corrosive media will not enter the groove 13337 and directly contact the first protective sublayer 1391, making the first protective sublayer 1391 less susceptible to corrosion. This helps ensure the integrity and corrosion resistance of the first protective sublayer 1391, ensuring that the first protective sublayer 1391 can perform its protective function for a long time.

[0141] Therefore, in the housing structure 10 of this application, the second protective sub-layer 1393 surrounds the outer wall 133 of the housing structure 10 and seals the groove 13337. At this time, the second protective sub-layer 1393 can prevent external corrosive media from entering and remaining in the groove 13337, effectively improving the integrity and corrosion resistance of the first protective sub-layer 1391, ensuring that the first protective sub-layer 1391 can provide long-term protection for the housing 13, fully guaranteeing the structural integrity and reliability of the housing 13, and effectively improving the service life and safety of the battery 100.

[0142] Please refer to Figures 1 to 3 In some embodiments, the second protective sub-layer 1393 is an insulating layer. In this case, the second protective sub-layer 1393 wraps around the outer shell 13, forming a continuous and dense protective barrier on the outside of the shell 13. This effectively isolates corrosive media, prevents mechanical wear on the shell 13, and delays the aging and failure of the shell structure 10. Simultaneously, the second protective sub-layer 1393 can uniformly distribute the circumferential stress borne by the shell 13, enhancing the overall buckling resistance and significantly improving electrical insulation performance and thermal stability, thus extending the service life of the battery 100.

[0143] Please refer to Figures 1 to 3 In some embodiments, the second protective sublayer 1393 is thermally shrinkable.

[0144] When the second protective sublayer 1393 has thermal shrinkage properties, the second protective sublayer 1393 can deform under heat to achieve a tighter bond with the shell 13, which is beneficial to improving the structural stability and protective performance of the second protective sublayer 1393.

[0145] Please refer to Figures 1 to 3In some embodiments, the housing 13 includes a body portion 1331, a crimping portion 1333, and a crimping portion 1335, and forms a groove 13337 with an inlet 13339 at one end. The second protective sub-layer 1393 includes two first sub-layers 13931 and a second sub-layer 13933. The two first sub-layers 13931 respectively cover at least a portion of the outer surface of the crimping portion 1335 and at least a portion of the outer surface of the body portion 1331. The second sub-layer 13933 is connected to the two first sub-layers 13931 respectively, and at least a portion of the second sub-layer 13933 extends into the groove 13337 through the inlet 13339 and covers the first protective sub-layer 1391. The thickness of the second sub-layer 13933 is greater than the thickness of the first sub-layer 13931.

[0146] In the above-described practical method, it should be noted that the specific structure and properties of the main body 1331, the coiling part 1333, the crimping part 1335, and the inlet 13339 of the groove 13337 in this embodiment are exactly the same as those of the main body 1331, the coiling part 1333, the crimping part 1335, and the inlet 13339 of the groove 13337 in the above-described embodiment, and will not be explained again here.

[0147] Please refer to Figure 3 (B) The first sublayer 13931 is at least a portion of the second protective sublayer 1393 that does not correspond to the groove 13337. There are two first sublayers 13931, which respectively cover at least a portion of the outer surface of the press-fit portion 1335 and at least a portion of the outer surface of the body portion 1331. The second sublayer 13933 is at least a portion of the second protective sublayer 1393 that corresponds to the groove 13337. The two first sublayers 13931 are respectively connected to opposite sides of the second sublayer 13933 in the axial direction of the housing 13, and the first sublayer 13931 and the second sublayer 13933 are generally an integral structure.

[0148] When at least a portion of the second sublayer 13933 extends into the groove 13337 through the inlet 13339 and covers the surface of the first protective sublayer 1391, there is no gap between the second sublayer 13933 and the first protective sublayer 1391. Compared with the embodiment where there is a gap between the second sublayer 13933 and the first protective sublayer 1391 and they jointly form a cavity, this embodiment has better structural reliability. It can avoid the exposure of the first protective sublayer 1391 caused by external force puncturing the second sublayer 13933, as well as the residue of corrosive media in the groove 13337, thereby significantly improving the protective reliability of the first protective sublayer 1391.

[0149] In some embodiments, the second protective sublayer 1393 has heat shrinkability. In this case, the second sublayer 13933 can be heated to shrink and embed into the groove 13337 and cover the first protective sublayer 1391. In this case, the second protective sublayer 1393 has the advantages of convenient construction and no need for complicated tooling, which significantly reduces the processing cost.

[0150] When the thickness of the second sublayer 13933 is greater than the thickness of the first sublayer 13931, the thickness of the second sublayer 13933 provides sufficient deformation allowance. When the second sublayer 13933 deforms and extends into the groove 13337 through the inlet 13339 and covers the first protective sublayer 1391, the second sublayer 13933 will not suffer from insufficient structural strength or even damage due to excessive thinning. This helps to ensure the structural reliability of the second protective sublayer 1393 and improve the protective performance of the second protective sublayer 1393.

[0151] Therefore, in the shell structure 10 of this application, since the thickness of the second sub-layer 13933 is greater than the thickness of the first sub-layer 13931, the second sub-layer 13933 has a larger deformation space. At this time, at least a portion of the second sub-layer 13933 can extend into the groove 13337 through the inlet 13339 and tightly fit to cover the first protective sub-layer 1391. The second protective sub-layer 1393 does not have any easily damaged suspended areas, which is conducive to ensuring the structural stability and integrity of the second protective sub-layer 1393, thereby ensuring the protective performance of the second protective sub-layer 1393 on the first protective sub-layer 1391, that is, fully ensuring the structural integrity and reliability of the shell 13.

[0152] Please refer to Figures 1 to 3 Secondly, this application provides a battery 100. The battery 100 includes a housing structure 10 and an electrode assembly 30 as described in any of the above embodiments. The housing structure 10 includes a housing 13 and a cover plate 11, with the housing 13 and the cover plate 11 connected to form a receiving cavity 101. The electrode assembly 30 is housed in the receiving cavity 101.

[0153] Correspondingly, please refer to Figures 1 to 6 Thirdly, this application provides a method for preparing a battery. The preparation method is used to prepare the battery 100 provided in this application, and the preparation method includes: 01: A workpiece 19 is provided, the workpiece 19 includes a bottom wall 131 and a side wall 133 extending from the periphery of the bottom wall 131, the bottom wall 131 and the side wall 133 forming a loading cavity 191; 02: Perform a grooving process on the sidewall 133 to form a body portion 1331 and a pre-rolled portion 193. The pre-rolled portion 193 is connected to the body portion 1331 and protrudes toward the center of the loading cavity 191 relative to the body portion 1331 to form a recessed groove 195. The recessed groove 195 is located outside the workpiece 19. The workpiece 19 includes an inner side and an outer side that are opposite to each other in the thickness direction. 03: A first protective sub-layer 1391 is formed on the outer side of the workpiece 19, and the first protective sub-layer 1391 at least covers the outer side of the initial roll portion 193; 041: Insert the electrode assembly 30 into the loading cavity 191, and install the sealing ring 15 and the cover plate 11 onto the initial winding section 193; 051: A snap-fit ​​operation is performed on the portion of the sidewall 133 that is connected to the initial roll portion 193 and is away from the main body portion 1331 to form a shell 13. The shell 13 includes a roll portion 1333 and a crimp portion 1335. The roll portion 1333 is formed from the initial roll portion 193. The crimp portion 1335 is connected to the end of the roll portion 1333 away from the main body portion 1331. The recessed groove 195 is deformed into a groove 13337. The first protective sublayer 1391 at least covers the outer surface of the groove 13337. The groove 13337 has an inlet 13339 at one end and is closed at the other end. The cover plate 11 is connected to the shell 13 and together they form an accommodating cavity 101; and... 06: A second protective sub-layer 1393 is provided around the outer side of the housing 13. The second protective sub-layer 1393 at least covers the inlet 13339 and at least covers the first protective sub-layer 1391.

[0154] In the above practical method, it should be noted that the specific structure and properties of the battery 100, housing structure 10, housing 13 and electrode assembly 30 in this embodiment are exactly the same as those in the above embodiment, and will not be explained again here.

[0155] As described above, the cover plate 11 is a structure in the housing structure 10 used to cover the housing 13. The housing 13 and the cover plate 11 can be directly connected or indirectly connected. When the housing 13 and the cover plate 11 are directly connected, the connection between the housing 13 and the cover plate 11 is usually non-removable. The spatial structure formed by the housing 13 and the cover plate 11 for accommodating the electrode assembly 30 and other structures is the accommodating cavity 101. It can be understood that the size and shape of the accommodating cavity 101 are jointly determined by the size and shape of the housing 13, the size and shape of the cover plate 11, and the connection method between the housing 13 and the cover plate 11, and directly affect the maximum size that the electrode assembly 30 can be set, thereby affecting the energy density of the battery 100. For example, the housing 13 and the cover plate 11 are sealed by a grooving process or by a welding process to ensure the sealing and safety of the battery 100.

[0156] It should be noted that when the shell structure 10 includes a shell 13 and a cover plate 11, the shell structure 10 may not be made of a single material. For example, the shell 13 and the cover plate 11 may be made of the same material, either steel or aluminum alloy. The shell structure 10 may also have different components made of different materials. For example, the shell 13 may be made of steel, while the cover plate 11 may be made of aluminum alloy. Of course, the materials of the shell 13 and the cover plate 11 can also be combined in other ways, which will not be listed here. It can be understood that the receiving cavity 101 is connected to the receiving cavity 1337 described above, and can also be considered as having a shared spatial structure between the receiving cavity 1337 and the receiving cavity 101.

[0157] The following describes the manufacturing process of battery 100, namely the forming process of housing structure 10. It can be understood that this process includes at least the grooving process performed on housing 13.

[0158] Workpiece 19 is a blank used to form housing 13. Workpiece 19 is typically formed from a flat substrate through processes such as stamping to give workpiece 19 a preliminary shape similar to housing 13. Workpiece 19 includes a bottom wall 131 and a side wall 133, wherein the bottom wall 131 of workpiece 19 becomes the bottom wall 131 of housing 13 in subsequent manufacturing processes, and the side wall 133 becomes the side wall 133 of housing 13 in subsequent manufacturing processes. The side wall 133 is connected to the periphery of the bottom wall 131 and extends from the periphery of the bottom wall 131. The side wall 133 and the bottom wall 131 can be an integral structure or a separate structure. When the side wall 133 and the bottom wall 131 are separate structures, the connection between the side wall 133 and the bottom wall 131 is usually a non-detachable connection. In this application, the spatial structure enclosed by the bottom wall 131 and the side wall 133 is defined as a loading cavity 191, which is used to accommodate functional structures such as electrode assembly 30. It is understood that the loading cavity 191 will subsequently become the receiving cavity 101. The size and shape of the loading cavity 191 are determined by the size and shape of the workpiece 19, and directly affect the maximum size that the electrode assembly 30 can be set, thereby affecting the energy density of the battery 100.

[0159] At this point, the provided workpiece 19 is vertically clamped in a fixture by manual operation or automatic equipment. A preset pressure is applied to the sidewall 133 by one or more radially fed rollers. The rollers roll the sidewall 133, causing controllable plastic bending deformation in a localized area, thus forming a curved structure at a predetermined height, completing the grooving process. The workpiece 19 at this point has the following shape: Figure 4 , Figure 5 and Figure 12 As shown.

[0160] The initial roll portion 193 is a curved structure formed on the side wall 133 by a grooving process. The body portion 1331 of the workpiece 19 is the main structure of the side wall 133. The body portion 1331 is connected to the periphery of the bottom wall 131 and extends from the periphery of the bottom wall 131. It can be understood that the body portion 1331 of the workpiece 19 is the same as the body portion 1331 of the housing 13 mentioned above. The initial roll portion 193 is connected to the side of the body portion 1331 away from the bottom wall 131 and protrudes relative to the body portion 1331 towards the center of the loading cavity 191, such as... Figure 4 , Figure 5 and Figure 12 As shown. It can be understood that the function of the coiling part 1333 includes, but is not limited to: providing a reference for axial positioning and sealing fit for subsequent cover plate 11 installation, and realizing the sealing fit between the housing 13 and the cover plate 11.

[0161] The recessed groove 195 is a spatial structure formed on the workpiece 19 after the grooving process. The recessed groove 195 is located at the end of the sidewall 133 away from the bottom wall 131 and is situated outside the workpiece 19. At least a portion of the other areas of the sidewall 133 where the recessed groove 195 is not formed are recessed towards the center of the loading cavity 191, i.e., recessed inwards towards the workpiece 19 in the thickness direction. It can be understood that the recessed groove 195 is the initial form of the groove 13337 and will transform into the groove 13337 during subsequent processing.

[0162] It is understandable that, at this time, due to the grooving process, the initial rolled portion 193 may deform and develop microcracks or localized damage. Therefore, the material required to form the first protective sub-layer 1391 (i.e., the protective matrix described below) is applied to the outside of the workpiece 19 to form the first protective sub-layer 1391 on the outside of the workpiece 19. In some embodiments, the first protective sub-layer 1391 only covers the outside of the initial rolled portion 193 to provide targeted protection for the areas most likely to be corroded; in other embodiments, the first protective sub-layer 1391 covers not only the outside of the initial rolled portion 193 but also other outer areas of the workpiece 19, in which case the first protective sub-layer 1391 provides broad and reliable protection for the workpiece 19.

[0163] After the grooving process is completed, the electrode assembly 30 and other structures are then installed into the loading cavity 191, and the sealing ring 15 and the cover plate 11 are placed into the workpiece 19 from top to bottom, so that the edge of the cover plate 11 sits above the initial roll portion 193, and at least a portion of the sealing ring 15 is disposed between the cover plate 11 and the workpiece 19, so as to prevent the sealing ring 15 from being displaced or falling out due to force during subsequent processing.

[0164] Subsequently, a sealing process is performed on the entire assembly consisting of the workpiece 19, cover plate 11, sealing ring 15, and electrode assembly 30. Specifically, the opening of the workpiece 19 on the side wall 133, which is connected to the initial roll portion 193 and is far from the main body portion 1331, is edge-fastened. This can be achieved by using a pressing mold to radially narrow or roll-press this portion of the workpiece 19, causing the uppermost part of the side wall 133 to bend inward and press against the edge of the cover plate 11. This part is the pressing portion 1335. At this time, the cover plate 11 is connected to the housing 13, together forming the receiving cavity 101, thus forming the housing structure 10. The housing 13 includes a pressing portion 1333 formed by the pressing portion 1335 and the initial roll portion 193, and the recessed groove 195 is transformed into a groove 13337. One end of the groove 13337 has an entrance 13339, while the other end is closed by the pressing portion 1333. At this time, the first protective sublayer 1391 at least covers the outer side of the groove 13337 to avoid corrosion caused by contact between at least part of the shell 13 corresponding to the groove 13337 and external humid air or other corrosive media.

[0165] It is understood that the coiling part 1333 and the pressing part 1335 are structures formed after the shell 13 and the cover plate 11 are sealed, rather than structures that exist in the early stage of production. Similarly, the receiving cavity 1337 and the groove 13337 are also spatial structures formed in the above-mentioned preparation process.

[0166] It is understandable that during the edge-fastening operation, the initial roll portion 193 with the first protective sub-layer 1391 will also deform, but the degree of deformation of this part is small, and the first protective sub-layer 1391 will not be damaged in this process, resulting in the exposure of the workpiece 19.

[0167] Furthermore, in order to protect the first protective sublayer 1391 and at least part of the housing 13, a second protective sublayer 1393 is disposed around the outer side of the housing 13, such that the second protective sublayer 1393 at least covers the inlet 13339 and at least covers the first protective sublayer 1391. Please refer to... Figure 2 and Figure 3 The enlarged view in (A) shows that the second protective sublayer 1393 surrounds the housing 13 and covers at least a portion of the area corresponding to the groove 13337, while also covering other portions of the housing 13 where the groove 13337 is not formed, in order to provide more complete protection for the housing 13.

[0168] In the battery 100 and its manufacturing method of this application, a groove 13337 is formed on the sidewall 133 of the casing 13. A first protective sublayer 1391 and a second protective sublayer 1393 are disposed on the outer surface of the casing 13 to protect the casing 13. The first protective sublayer 1391 at least covers the outer surface of the groove 13337 to protect the relatively weak area where the groove 13337 is located. The second protective sublayer 1393 at least covers the first protective sublayer 1391 to protect the first protective sublayer 1391, thereby further enhancing the protective effect on the area where the groove 13337 is located. At this time, the contact between external humid air and other corrosive media and the area of ​​the casing 13 where the groove 13337 is located is blocked, making it less likely to cause corrosion of the casing 13. The structural integrity and reliability of the casing 13 are better, and the service life and safety of the battery 100 are effectively guaranteed.

[0169] Please refer to Figure 1 , Figure 2 , Figures 4 to 7 In some embodiments, 03: A first protective sublayer 1391 is formed on the outer side of the workpiece 19, comprising: 031: The protective substrate shall be applied at least to the outer side of the initial roll portion 193; and, 033: Solidify the protective matrix to form the first protective sublayer 1391.

[0170] The protective matrix is ​​the material used to form the first protective sub-layer 1391. The protective matrix is ​​typically a fluid, which allows for greater flexibility in the placement of the first protective sub-layer 1391. In this case, the protective matrix is ​​placed on the outside of the workpiece 19, at least covering the outside of the initial roll portion 193. Because the protective matrix is ​​a fluid, it can automatically level to fill minor cracks or localized damage, and it can form a thin film with good uniformity.

[0171] Then, the protective substrate is cured by natural curing, heat curing, or light curing to form the first protective sublayer 1391. It is understood that the leveling properties of the protective substrate ensure that the formed first protective sublayer 1391 provides a seamless and uniform coating of the workpiece 19, which helps eliminate stress concentration points in the first protective sublayer 1391. Simultaneously, the curing process can be precisely controlled by heat, light, or chemical initiators, which helps improve the consistency of the process and ensures that the first protective sublayer 1391 has good barrier functions such as corrosion resistance.

[0172] Therefore, in the battery preparation method of this application, a protective matrix is ​​provided at least on the outer side of the initial roll portion 193, and a first protective sub-layer 1391 is formed by curing. The leveling property of the protective matrix ensures that the first protective sub-layer 1391 can uniformly cover the workpiece 19 without gaps, eliminating stress concentration. At the same time, since the curing parameters are adjustable, the formation process of the first protective sub-layer 1391 has good consistency, and the formed first protective sub-layer 1391 can fully and reliably exert its corrosion resistance performance.

[0173] Please refer to Figure 1 , Figure 2 , Figures 4 to 8 In some embodiments, 031: disposing a protective substrate on the outside of the initial roll portion 193 includes: 0311: When the protective substrate is silicone, apply the protective substrate by dotting, spraying or brushing on the outer side of the initial roll 193; 0313: When the protective substrate is polyurethane, brush the protective substrate onto the outer side of the initial roll portion 193. 0315: When the protective substrate is epoxy resin, a protective substrate is sprayed onto the outer side of the initial roll portion 193; and, 0317; When the protective substrate is a light-curing substrate, apply the protective substrate to the outer side of the initial roll portion 193.

[0174] As mentioned above, the first protective sublayer 1391 may be, but is not limited to, at least one of silicone layer, polyurethane layer, epoxy resin layer and photocurable layer. When selecting the coating method of the protective substrate, the rheological behavior, curing mechanism and wettability of the protective substrate to the surface of the workpiece 19 should be comprehensively considered to take into account feasibility, uniformity of layer thickness and curing quality.

[0175] When the first protective sublayer 1391 is an organosilicon layer, the protective matrix is ​​organosilicon. Organosilicon usually has moderate viscosity and good thixotropy, and exhibits excellent wetting ability for workpieces 19 made of various metal materials. Therefore, a continuous and dense covering layer can be formed on the outer side of the initial roll portion 193 by means of spot coating, spraying or brushing.

[0176] When the first protective sublayer 1391 is a polyurethane layer, the protective matrix is ​​polyurethane. Polyurethane often has a high viscosity. Using a brush coating method is beneficial to make the material fully penetrate into the micro-unevenness of the surface of the initial roll 193 by means of the mechanical extrusion action of the brush bristles, while reducing the entrainment of air bubbles and making it easier to accurately control the thickness of the polyurethane.

[0177] When the first protective sublayer 1391 is an epoxy resin layer, the protective matrix is ​​epoxy resin. Epoxy resin usually needs to form a thin and uniform coating layer, and the heat released during the curing of epoxy resin may be sensitive to the thickness. Spraying can achieve fine and uniform coating by using atomized droplets to ensure that the thickness of each area of ​​the coating layer is consistent, reduce stress concentration, and facilitate the rapid coverage of large areas.

[0178] When the first protective sublayer 1391 is a photocurable layer, the protective substrate is a photocurable substrate (UV adhesive). The curing of the photocurable substrate depends on ultraviolet light irradiation. The amount of adhesive applied needs to be precisely controlled. The spot coating method can achieve quantitative and point-to-point feeding, prevent overflow to non-target areas, and avoid incomplete curing of shadow areas due to large-area coating. After spot coating, it can be quickly cured by light irradiation, which is convenient for positioning and connection with subsequent processes.

[0179] Therefore, in the battery preparation method of this application, different protective substrates can be flexibly selected to provide multiple options for the protection of the casing 13, and the battery preparation method has good flexibility.

[0180] Please refer to Figure 1 , Figure 2 , Figures 4 to 7 ,and Figure 9 In some embodiments, 033: curing the protective matrix and forming the first protective sublayer 1391 includes: 0331: When the protective matrix is ​​silicone, the workpiece 19 with the protective matrix is ​​left to stand at room temperature to allow the protective matrix to cure. The standing time t1 satisfies that 2 hours ≤ t1 ≤ 24 hours. Alternatively, the protective matrix is ​​heated to cure the protective matrix. The heating temperature Tem and the heating time t2 satisfy that 60 degrees ≤ Tem ≤ 80 degrees and 10 minutes ≤ t2 ≤ 30 minutes. 0333; When the protective matrix is ​​polyurethane, the protective matrix is ​​heated to cure it, wherein the heating temperature Tem and the heating time t2 satisfy: 60 degrees ≤ Tem ≤ 80 degrees, 10 minutes ≤ t2 ≤ 30 minutes; 0335: When the protective substrate is epoxy resin, the protective substrate is heated to cure it, wherein the heating temperature Tem and the heating time t2 satisfy: 80 degrees ≤ Tem ≤ 120 degrees, 20 minutes ≤ t2 ≤ 60 minutes; and, 0337: When the protective substrate is a photocurable substrate, the protective substrate is irradiated with ultraviolet light to cure it, wherein the irradiation time t3 satisfies: 5 seconds ≤ t3 ≤ 30 seconds.

[0181] When the protective matrix is ​​silicone, the silicone can be cured naturally at room temperature. In this case, simply placing the workpiece 19 with the protective matrix in a clean environment at room temperature (e.g., around 25 degrees Celsius) will allow the protective matrix to cure and form the first protective sublayer 1391. The formation process of the first protective sublayer 1391 has the advantages of simple operation and low cost. The settling time t1 can be, but is not limited to, any one or any two of 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 10 hours, 12 hours, 15 hours, 20 hours, and 24 hours. When the settling time t1 meets the above range, the settling time t1 is more suitable, allowing the protective matrix to fully cure, so that the formed first protective sublayer 1391 has good structural strength. At this time, the first protective sublayer 1391 can provide good protection for the shell 13. It can be understood that the settling time t1 can be determined by temperature, the range of silicone concentration, and the thickness of the silicone.

[0182] In some embodiments, to improve the curing efficiency of the silicone, the protective substrate of the workpiece 19 with the protective matrix can be heated to promote rapid curing of the protective substrate. The heating time t2 can be, but is not limited to, any one or any two of 10 minutes, 13 minutes, 16 minutes, 19 minutes, 20 minutes, 23 minutes, 26 minutes, 28 minutes, 29 minutes, and 30 minutes. The heating temperature Tem can be, but is not limited to, any one or any two of 60 degrees, 62 degrees, 64 degrees, 66 degrees, 68 degrees, 70 degrees, 72 degrees, 75 degrees, 78 degrees, and 80 degrees.

[0183] When the heating temperature Tem and heating time t2 meet the above-mentioned ranges, the heating temperature Tem and heating time t2 are more suitable, allowing the organosilicon to cure rapidly. This ensures that the formed first protective sublayer 1391 has good structural strength while also improving the fabrication efficiency of the battery 100. It is understood that the heating temperature Tem and heating time t2 can be determined based on the range of organosilicon settings and the desired thickness.

[0184] When the protective substrate is polyurethane, heat curing is typically used to achieve efficient curing of the protective substrate. The heating time t2 can be, but is not limited to, any one or any two of 10 minutes, 13 minutes, 16 minutes, 19 minutes, 20 minutes, 23 minutes, 26 minutes, 28 minutes, 29 minutes, and 30 minutes. The heating temperature Tem can be, but is not limited to, any one or any two of 60 degrees Celsius, 62 degrees Celsius, 64 degrees Celsius, 66 degrees Celsius, 68 degrees Celsius, 70 degrees Celsius, 72 degrees Celsius, 75 degrees Celsius, 78 degrees Celsius, and 80 degrees Celsius.

[0185] When the heating temperature Tem and heating time t2 meet the above-mentioned ranges, the heating temperature Tem and heating time t2 are more suitable, allowing the polyurethane to cure rapidly. This ensures that the formed first protective sublayer 1391 has good structural strength while also improving the fabrication efficiency of the battery 100. It is understood that the heating temperature Tem and heating time t2 can be determined based on the range of polyurethane settings and the desired thickness.

[0186] When the protective substrate is epoxy resin, heat curing is typically used to achieve efficient curing of the protective substrate. The heating time t2 can be, but is not limited to, any one or any two of the following: 20 minutes, 24 minutes, 26 minutes, 30 minutes, 34 minutes, 36 minutes, 40 minutes, 45 minutes, 50 minutes, and 60 minutes. The heating temperature Tem can be, but is not limited to, any one or any two of the following: 80 degrees Celsius, 85 degrees Celsius, 90 degrees Celsius, 95 degrees Celsius, 100 degrees Celsius, 105 degrees Celsius, 110 degrees Celsius, 115 degrees Celsius, 118 degrees Celsius, and 120 degrees Celsius.

[0187] When the heating temperature Tem and heating time t2 meet the above-mentioned ranges, the heating temperature Tem and heating time t2 are more suitable, allowing the epoxy resin to cure rapidly. This ensures that the formed first protective sublayer 1391 has good structural strength while also improving the fabrication efficiency of the battery 100. It is understood that the heating temperature Tem and heating time t2 can be determined based on the range of epoxy resin settings and the desired thickness.

[0188] When the protective substrate is a photocurable substrate, ultraviolet (UV) light curing is typically used to achieve efficient curing of the protective substrate. The irradiation time t3 can be, but is not limited to, any one or any two of the following: 5 seconds, 8 seconds, 10 seconds, 15 seconds, 20 seconds, 24 seconds, 26 seconds, 28 seconds, 29 seconds, and 30 seconds. When the irradiation time t3 meets the above range, it is considered suitable. The curing process of the photocurable substrate is simple and the curing rate is extremely fast. While ensuring that the formed first protective sublayer 1391 has good structural strength, it greatly improves the preparation efficiency of the battery 100, making it suitable for high-speed automated production lines. It can be understood that the irradiation time t3 can be determined based on the setting range and thickness of the epoxy resin.

[0189] Please refer to Figures 1 to 5 ,and Figure 10 In some embodiments, the second protective sublayer 1393 is heat-shrinkable. The preparation method further includes: 07: At least the area of ​​the second protective sublayer 1393 opposite to the inlet 13339 is heated, so that at least a portion of the second protective sublayer 1393 opposite to the inlet 13339 is heated and deformed, and extends into the groove 13337 through the inlet 13339 and covers at least a portion of the first protective sublayer 1391.

[0190] When the second protective sublayer 1393 is thermally shrinkable, it can deform under heat. Since the second protective sublayer 1393 at least covers the inlet 13339, the area of ​​the second protective sublayer 1393 opposite to the inlet 13339 is radially spaced from the first protective sublayer 1391 in the workpiece 19, forming a cavity. At this time, an external structure may puncture the second protective sublayer 1393 and extend into the cavity, the first protective sublayer 1391 may be exposed to corrosive media, and corrosive media may accumulate in the groove 13337.

[0191] Therefore, based on the thermal shrinkage property of the second protective sublayer 1393, by heating the region of the second protective sublayer 1393 opposite to the inlet 13339, at least a portion of the second protective sublayer 1393 opposite to the inlet 13339 is thermally deformed. This portion of the second protective sublayer 1393 is the second sublayer 13933 described above. At this time, the second sublayer 13933 shrinks and is embedded in the groove 13337 through the inlet 13339, covering the first protective sublayer 1391, as shown below. Figure 3 As shown in (B). At this time, the second protective sublayer 1393 has the advantages of convenient construction and no need for complex tooling, which significantly reduces the processing cost and further improves the reliability of protection.

[0192] Therefore, in the battery manufacturing method of this application, the second protective sublayer 1393 has thermal shrinkability. At least a portion of the second protective sublayer 1393 opposite to the inlet 13339 can extend into the groove 13337 through the inlet 13339 and tightly fit to cover the first protective sublayer 1391. The second protective sublayer 1393 does not have any easily damaged suspended areas, which is beneficial to ensuring the structural stability and integrity of the second protective sublayer 1393, thereby ensuring the protective performance of the second protective sublayer 1393 on the first protective sublayer 1391, that is, fully ensuring the structural integrity and reliability of the casing 13.

[0193] Please refer to Figure 1 , Figures 11 to 13 In some embodiments, the battery 100 further includes a busbar 50, which is electrically connected to the electrode assembly 30. The busbar 50 is disposed between the electrode assembly 30 and the cover plate 11 in the height direction Z of the housing 13. The peripheries of both the busbar 50 and the cover plate 11 extend into the receiving cavity 1337 of the housing structure 10 and are pressed together by the crimping portion 1333 and the pressing portion 1335 of the housing structure 10.

[0194] Correspondingly, in some embodiments, the preparation method further includes: 043: Insert the electrode assembly 30 into the loading cavity 191, and install the sealing ring 15, cover plate 11, and manifold 50 onto the initial winding section 193; and, 053: A snap-fit ​​operation is performed on the portion of the sidewall 133 that is connected to the initial roll portion 193 and is away from the main body portion 1331 to form a housing 13. The housing 13 includes a roll-press portion 1333 and a crimp portion 1335. The roll-press portion 1333 is formed from the initial roll portion 193. The crimp portion 1335 is connected to the end of the roll-press portion 1333 that is away from the main body portion 1331. The recessed groove 195 is transformed into a groove 13337. The first protective sub-layer 1391 at least covers the outer side surface of the groove 13337. The groove 13337 has an inlet 13339 at one end and is closed at the other end. The cover plate 11 and the manifold 50 are both connected to the housing 13 and are pressed together by the roll-press portion 1333 and the crimp portion 1335. The cover plate 11 and the housing 13 together form a receiving cavity 101.

[0195] The busbar 50 is a key structural component inside the battery 100 used to collect and output current from the electrode assembly 30. The busbar 50 is typically a circular or irregularly shaped metal sheet, and its material can be, but is not limited to, at least one of aluminum, copper, or nickel. In the height direction Z of the housing 13, the busbar 50 is positioned between the electrode assembly 30 and the cover plate 11, and physically collects the current generated by the electrode assembly 30 through an electrical connection, guiding it to external circuits through structures such as terminals or connecting pieces. The connection between the busbar 50 and the electrode assembly 30 is often achieved using ultrasonic welding or laser welding, ensuring low contact resistance and high current carrying capacity.

[0196] After completing the grooving process, the electrode assembly 30 and other structures are then installed into the loading cavity 191, and the sealing ring 15, cover plate 11, and manifold 50 are placed into the workpiece 19 from top to bottom, as follows. Figure 12 As shown, at this time, the edge of the manifold 50 is positioned above the initial roll portion 193, and the cover plate 11 is disposed above the manifold 50, with at least a portion of the sealing ring 15 positioned between the manifold 50 and the workpiece 19 to prevent the sealing ring 15 from shifting or coming off due to stress during subsequent processing. Subsequently, a snap-fit ​​operation is performed on the entire assembly consisting of the workpiece 19, manifold 50, cover plate 11, sealing ring 15, and electrode assembly 30. The specific process of the snap-fit ​​operation is as described above and will not be repeated here.

[0197] After the edge-fastening operation is completed, the housing structure 10 forms a receiving cavity 1337. The periphery of the manifold 50 and the periphery of the cover plate 11 are stacked and extend into the receiving cavity 1337, thereby connecting the cover plate 11, the manifold 50, and the housing 13. At this time, the pressing part 1333 and the crimping part 1335 jointly press the manifold 50 and the cover plate 11 together, and the sealing ring 15 seals the gaps between the manifold 50 and the cover plate 11 and the housing 13.

[0198] It is understandable that during the edge-fastening operation at this time, the initial roll portion 193 with the first protective sub-layer 1391 will also deform. However, due to the addition of the cover plate 11, when the cover plate 11 has the same thickness, the degree of deformation of the initial roll portion 193 is further reduced compared to the embodiment where the manifold 50 is provided in the receiving cavity 101. This reduces the possibility of cracks in the roll pressing portion 1333 and the risk of the workpiece 19 being exposed due to damage to the first protective sub-layer 1391, which helps to ensure the corrosion resistance and structural reliability of the housing 13.

[0199] Therefore, in the battery 100 and its manufacturing method of this application, the busbar 50 is used to electrically connect the electrode assembly 30. The busbar 50 and the periphery of the cover plate 11 extend into the receiving cavity 1337 and are pressed together by the coiling part 1333 and the pressing part 1335. At this time, when the cover plate 11 has the same thickness, the deformation of the workpiece 19 during the manufacturing process of the battery 100 is reduced, and the coiling part 1333 and the first protective sub-layer 1391 can have good structural integrity, which greatly avoids the corrosion of the area where the groove 13337 is located by the corrosive medium, fully ensuring the structural integrity and reliability of the shell 13, and is conducive to improving the service life and safety of the battery 100.

[0200] Please refer to Figure 1 and Figure 14 Fourthly, this application provides a battery pack 1000. The battery pack 1000 includes the battery 100 described in any of the above embodiments, or the battery 100 manufactured by the preparation method described in any of the above embodiments.

[0201] Specifically, the battery pack 1000 is a composite structure composed of multiple individual batteries 100. The battery pack 1000 can store and release energy by connecting and controlling the batteries 100. The battery pack 1000 typically includes batteries 100 and a carrier. Multiple batteries 100 can be connected in series, parallel, or a combination thereof; a combination means that multiple batteries 100 are connected in both series and parallel. Multiple batteries 100 can be directly connected in series, parallel, or a combination thereof, and then the entire assembly of the multiple batteries 100 is housed within a carrier (e.g., a battery box). The battery pack 1000 may also include other structures; for example, the battery pack 1000 may also include a busbar (not shown) for electrical connection between the multiple batteries 100. It is understood that the number of batteries 100 in the battery pack 1000 can be adaptively adjusted according to the application scenario and capacity.

[0202] A battery box is a structure for holding a battery 100. The cross-section of the battery box may be, but is not limited to, circular, elliptical, square, or other polygonal shapes. The battery box is made of materials including, but not limited to, metals and non-metals. Metals include aluminum, iron, steel, aluminum alloys, or iron alloys, while non-metals include, but are not limited to, plastics. The battery box includes a body and a lid. The body and lid are combined to form a cavity in which the battery 100 is housed. The body is the component in the battery box that loads and supports the battery 100. One end of the body is closed, and the other end has an opening for inserting the battery 100 into the cavity. The lid is the component in the battery box that covers the opening. The connection between the body and the lid can be detachable. Furthermore, when the battery box includes a body and a lid, the battery box may not be made of a single material. For example, the body and lid may be made of the same material, aluminum alloy. The battery box may also have different components made of different materials. For example, the body may be made of metal, while the lid may be made of plastic. Of course, the materials for the box body and the lid can also be combined with other materials, which will not be listed here.

[0203] Since the battery pack 1000 in this application includes the battery 100 described in any of the above embodiments, or the battery 100 made by the preparation method described in any of the above embodiments, it is understood that the battery pack 1000 includes at least the same beneficial effects as the battery 100 or the battery preparation method. Therefore, the beneficial effects of the battery pack 1000 should be referred to the beneficial effects of the battery 100 or the battery preparation method described above.

[0204] Please refer to Figure 1 , Figure 14 and Figure 15 Fifthly, this application provides an electrical device 10000. The electrical device 10000 includes a battery 100 as described in any of the above embodiments, or a battery 100 manufactured by the preparation method described in any of the above embodiments, or a battery pack 1000 as described in any of the above embodiments.

[0205] Specifically, electrical equipment 10000 refers to a device or system that uses electrical energy to work or perform specific functions. The core function of electrical equipment 10000 is to convert electrical energy into other forms of energy (such as light energy, heat energy, and mechanical energy). Electrical equipment 10000 includes load devices that directly consume electrical energy (such as lighting fixtures and electric motors) as well as energy storage and power supply devices, such as battery 100 or battery pack 1000. Battery 100 or battery pack 1000 stores electrical energy through internal electrochemical reactions and releases it when needed to provide power support for electrical equipment 10000.

[0206] Electrical equipment 10000 can be, but is not limited to, vehicles, smart wearable devices, mobile terminals, home appliances, and medical devices; this application embodiment does not limit this. Vehicles include, but are not limited to, cars, buses, trains, ships, aircraft, etc. Smart wearable devices include, but are not limited to, smartwatches, smart bracelets, neck massagers, etc. Mobile terminals include, but are not limited to, smartphones, laptops, tablets, POS (point of sales terminal) machines. Home appliances include, but are not limited to, televisions, washing machines, air conditioners, rice cookers, smart robot vacuums, smart lights, etc. Medical devices include, but are not limited to, infrared electronic thermometers, pulse oximeters, body composition analyzers, etc. Correspondingly, the battery 100 or battery pack 1000 may have different shapes, sizes, capacities, and performance characteristics.

[0207] Since the electrical device 10000 in this application includes the battery 100 described in any of the above embodiments, or the battery 100 manufactured by the preparation method described in any of the above embodiments, or the battery pack 1000 described in any of the above embodiments, it can be understood that the electrical device 10000 has at least the same beneficial effects as the battery 100, the battery preparation method, or the battery pack 1000. Therefore, the beneficial effects of the electrical device 10000 should also be referred to the beneficial effects of the battery 100, the battery preparation method, or the battery pack 1000 described above.

[0208] The technical features of the embodiments described above can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. Furthermore, other implementation methods can be derived from the above embodiments, allowing for structural and logical substitutions and changes without departing from the scope of this disclosure.

[0209] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery casing structure (10), characterized in that, include: The housing (13) includes a bottom wall (131) and a side wall (133) extending from the periphery of the bottom wall (131). The side wall (133) has a groove (13337). The outer surface of the housing (13) is provided with a first protective sub-layer (1391) and a second protective sub-layer (1393). The first protective sub-layer (1391) at least covers the outer surface of the groove (13337). The second protective sub-layer (1393) at least covers the first protective sub-layer (1391).

2. The shell structure (10) according to claim 1, characterized in that, The sidewall (133) includes a body portion (1331), a coiled portion (1333), and a crimping portion (1335). In a direction away from the bottom wall (131), the body portion (1331), the coiled portion (1333), and the crimping portion (1335) are sequentially connected. The coiled portion (1333) protrudes relative to the body portion (1331) toward the center of the shell structure (10), forming the groove (13337). (1333) together with the crimping part (1335) forms a receiving cavity (1337). The crimping part (1335) includes a first sub-part (13351) and a second sub-part (13353). The opposite ends of the first sub-part (13351) are respectively connected to the crimping part (1333) and the second sub-part (13353). The second sub-part (13353) is spaced apart from the bottom wall (131). The shell structure (10) further includes: A sealing ring (15) is housed within the receiving cavity (1337) and seals the housing structure (10).

3. The shell structure (10) according to claim 2, characterized in that, The first protective sublayer (1391) also covers at least a portion of the outer surface of the crimped portion (1335), and the second protective sublayer (1393) completely covers the first protective sublayer (1391); and / or, The first protective sublayer (1391) covers at least a portion of the outer surface of the body portion (1331), and the second protective sublayer (1393) completely covers the first protective sublayer (1391).

4. The shell structure (10) according to any one of claims 1-3, characterized in that, The thickness T1 of the first protective sublayer (1391) and the thickness T of the shell (13) satisfy: 0.2 ≤ T1 / T ≤ 1.0; and / or, The thickness T of the shell (13) satisfies: 0.1mm ≤ T ≤ 0.6mm; and / or, The first protective sub-layer (1391) is at least one of an organosilicon layer, a polyurethane layer, an epoxy resin layer, and a photocurable layer; when the first protective sub-layer (1391) is an organosilicon layer, the thickness T1 of the first protective sub-layer (1391) satisfies: 0.1mm ≤ T1 ≤ 0.5mm; when the first protective sub-layer (1391) is a polyurethane layer or an epoxy resin layer, the thickness T1 of the first protective sub-layer (1391) satisfies: 0.05mm ≤ T1 ≤ 0.50mm; when the first protective sub-layer (1391) is a photocurable layer, the thickness T1 of the first protective sub-layer (1391) satisfies: 0.05mm ≤ T1 ≤ 0.30mm; and / or, The thickness T2 of the second protective sublayer (1393) satisfies: 0.05mm ≤ T2 ≤ 0.40mm; and / or, The second protective sublayer (1393) is at least one of a polyvinyl chloride layer, a polyethylene terephthalate layer, and a polyimide layer; and / or, The housing (13) includes a base layer (1355) and a functional layer (1358). The base layer (1355) includes an inner surface (13551) and an outer surface (13553) opposite to each other in the thickness direction of the housing (13). The functional layer (1358) covers the inner surface (13551) and / or the outer surface (13553). The thickness T1 of the first protective sublayer (1391) and the thickness T3 of the functional layer (1358) satisfy: 5T3≤T1; and / or, In the axial direction of the housing (13), the opening size W of the groove (13337) satisfies: 0 <W≤4mm。 5. The shell structure (10) according to claim 4, characterized in that, The thickness T1 of the first protective sublayer (1391) and the thickness T of the shell (13) satisfy: 0.4 ≤ T1 / T ≤ 0.6; and / or, The thickness T of the shell (13) satisfies: 0.2mm ≤ T ≤ 0.5mm; and / or, The first protective sub-layer (1391) is at least one of an organosilicon layer, a polyurethane layer, an epoxy resin layer, and a photocurable layer; when the first protective sub-layer (1391) is an organosilicon layer, the thickness T1 of the first protective sub-layer (1391) satisfies: 0.2mm ≤ T1 ≤ 0.4mm; when the first protective sub-layer (1391) is a polyurethane layer or an epoxy resin layer, the thickness T1 of the first protective sub-layer (1391) satisfies: 0.20mm ≤ T1 ≤ 0.35mm; when the first protective sub-layer (1391) is a photocurable layer, the thickness T1 of the first protective sub-layer (1391) satisfies: 0.10mm ≤ T1 ≤ 0.25mm; and / or, The thickness T2 of the second protective sublayer (1393) satisfies: 0.10mm≤T2≤0.30m.

6. The shell structure (10) according to any one of claims 2-3, characterized in that, In the radial direction of the housing (13), the maximum distance D1 between the outer side surface corresponding to the recess (13337) and the joint of the crimp portion (1335) and the roll-press portion (1333) satisfies: 0<D1≤6mm; and / or, The radial distance D2 that the first protective sub-layer (1391) extends to the crimp portion (1335) satisfies: 0.5mm≤D2≤4mm; and / or, The radial distance D3 that the first protective sub-layer (1391) extends to the main body portion (1331) satisfies: 0.5mm≤D3≤4mm; and / or, The axial distance D4 that the first protective sub-layer (1391) extends to the crimp portion (1335) satisfies: 1mm≤D4≤8mm; and / or, The axial distance D5 that the first protective sub-layer (1391) extends to the main body portion (1331) satisfies: 1mm≤D5≤8mm; and / or, The first protective sub-layer (1391) further extends to the outer side surface of the crimp portion (1335) and / or the outer side surface of the main body portion (1331), and the maximum width Lmax of the first protective sub-layer (1391) in the radial direction of the housing (13) and the minimum thickness Tmin of the roll-press portion (1333) satisfy: 10Tmin≤Lmax.

7. The shell structure (10) according to any one of claims 1-3, characterized in that, The second protective sub-layer (1393) surrounds the outer side wall of the housing structure (10), the second protective sub-layer (1393) extends to the crimp portion (1335) and / or the main body portion (1331) of the housing (13), and encloses the recess (13337).

8. The shell structure (10) according to claim 7, characterized in that, The second protective sub-layer (1393) is an insulating layer; The second protective sub-layer (1393) has heat shrinkability; and / or, The housing (13) includes a main body portion (1331), a roll-press portion (1333) and a crimp portion (1335), and forms the recess (13337) with an inlet (13339) at one end, the second protective sub-layer (1393) includes: Two first sub-layers (13931), respectively covering at least part of the outer side surface of the crimp portion (1335) and at least part of the outer side surface of the main body portion (1331), and, A second sub-layer (13933), respectively connected to the two first sub-layers (13931), at least part of the second sub-layer (13933) extends into the recess (13337) through the inlet (13339) and covers the first protective sub-layer (1391), and the thickness of the second sub-layer (13933) is greater than the thickness of the first sub-layer (13931).

9. A battery (100), characterized in that, comprising: The housing structure (10) according to any one of claims 1 to 8, the housing structure (10) comprising a housing (13) and a cover plate (11), the housing (13) being connected to the cover plate (11) to form an accommodating cavity (101); and, An electrode assembly (30), accommodated in the accommodating cavity (101).

10. The battery (100) according to claim 9, characterized in that, The battery (100) also includes a busbar (50), which is electrically connected to the electrode assembly (30). In the height direction of the housing (13), the busbar (50) is disposed between the electrode assembly (30) and the cover plate (11). The periphery of the busbar (50) and the cover plate (11) both extend into the receiving cavity (1337) of the housing structure (10) and are pressed by the rolling part (1333) and the pressing part (1335) of the housing structure (10).

11. A method for preparing a battery, characterized in that, The method for preparing the battery (100) according to claim 9 or 10 includes: A workpiece (19) is provided, the workpiece (19) including a bottom wall (131) and a side wall (133) extending from the periphery of the bottom wall (131), the bottom wall (131) and the side wall (133) forming a loading cavity (191). A grooving process is performed on the sidewall (133) to form a body part (1331) and a roll part (193). The roll part (193) is connected to the body part (1331) and protrudes toward the center of the loading cavity (191) relative to the body part (1331) to form a recessed groove (195). The recessed groove (195) is located outside the workpiece (19). The workpiece (19) includes an inner side and an outer side that are opposite to each other in the thickness direction. A first protective sub-layer (1391) is formed on the outer side of the workpiece (19), the first protective sub-layer (1391) at least covering the outer side of the initial roll portion (193); The electrode assembly (30) is inserted into the loading cavity (191), and the sealing ring (15) and cover plate (11) are loaded onto the initial roll portion (193); A snap-fit ​​operation is performed on the portion of the sidewall (133) connected to the initial rolled portion (193) and away from the main body portion (1331) to form the housing (13). The housing (13) includes a rolled portion (1333) and a pressing portion (1335). The rolled portion (1333) is formed by the initial rolled portion (193). The pressing portion (1335) is connected to the end of the rolled portion (1333) away from the main body portion (1331). The recessed groove (195) is deformed into a groove (13337). The first protective sublayer (1391) at least covers the outer surface of the groove (13337). The groove (13337) has an inlet (13339) at one end and is closed at the other end. The cover plate (11) is connected to the housing (13) and together they form a receiving cavity (101). A second protective sub-layer (1393) is provided around the outer side of the housing (13), the second protective sub-layer (1393) at least covers the entrance (13339), and the second protective sub-layer (1393) at least covers the first protective sub-layer (1391).

12. The preparation method according to claim 11, characterized in that, 03: The formation of the first protective sub-layer (1391) on the outer side of the workpiece (19) includes: The protective substrate shall be disposed at least on the outer side of the initial roll portion (193); and, The protective matrix is ​​solidified to form the first protective sublayer (1391).

13. The preparation method according to claim 12, characterized in that, 031: The provision of the protective substrate on the outer side of the initial roll portion (193) includes: When the protective matrix is ​​silicone, the protective matrix is ​​applied by dotting, spraying or brushing on the outer side of the initial roll (193); When the protective matrix is ​​polyurethane, the protective matrix is ​​brushed onto the outer side of the initial roll portion (193); When the protective matrix is ​​epoxy resin, the protective matrix is ​​sprayed onto the outer side of the initial roll portion (193); and, When the protective substrate is a photocurable substrate, the protective substrate is applied to the outer side of the initial roll portion (193).

14. The preparation method according to claim 12, characterized in that, 033: The solidification of the protective matrix and the formation of the first protective sublayer (1391) includes: When the protective matrix is ​​silicone, the workpiece (19) with the protective matrix is ​​left to stand at room temperature to allow the protective matrix to cure. The standing time t1 satisfies that 2 hours ≤ t1 ≤ 24 hours. Alternatively, the protective matrix is ​​heated to allow the protective matrix to cure. The heating temperature Tem and the heating time t2 satisfy that 60 degrees ≤ Tem ≤ 80 degrees and 10 minutes ≤ t2 ≤ 30 minutes. When the protective matrix is ​​polyurethane, the protective matrix is ​​heated to cure it, wherein the heating temperature Tem and the heating time t2 satisfy: 60 degrees ≤ Tem ≤ 80 degrees, 10 minutes ≤ t2 ≤ 30 minutes; When the protective matrix is ​​epoxy resin, the protective matrix is ​​heated to cure it, wherein the heating temperature Tem and the heating time t2 satisfy: 80 degrees ≤ Tem ≤ 120 degrees, 20 minutes ≤ t2 ≤ 60 minutes; and, When the protective substrate is a photocurable substrate, the protective substrate is irradiated with ultraviolet light to cure it, wherein the irradiation time t3 satisfies: 5 seconds ≤ t3 ≤ 30 seconds.

15. The preparation method according to claim 12, characterized in that, The second protective sublayer (1393) is heat-shrinkable, and the preparation method further includes: At least the area of ​​the second protective sublayer (1393) opposite to the inlet (13339) is heated, so that at least a portion of the second protective sublayer (1393) opposite to the inlet (13339) is heated and deformed, and extends into the groove (13337) through the inlet (13339) and covers at least a portion of the first protective sublayer (1391).

16. The preparation method according to claim 11, characterized in that, Also includes: The electrode assembly (30) is inserted into the loading cavity (191), and the sealing ring (15), cover plate (11), and manifold (50) are loaded onto the initial winding section (193); and, A snap-fit ​​operation is performed on the portion of the sidewall (133) that is connected to the initial rolled portion (193) and is away from the main body portion (1331) to form the housing (13). The housing (13) includes a rolled portion (1333) and a crimping portion (1335). The rolled portion (1333) is formed by the initial rolled portion (193), and the crimping portion (1335) is connected to the end of the rolled portion (1333) away from the main body portion (1331). The recessed groove (195) The groove (13337) is deformed into a groove, and the first protective sub-layer (1391) covers at least the outer side of the groove (13337). The groove (13337) has an inlet (13339) at one end and is closed at the other end. The cover plate (11) and the manifold (50) are both connected to the housing (13) and are pressed together by the rolling part (1333) and the pressing part (1335). The cover plate (11) and the housing (13) together form a receiving cavity (101).

17. A battery pack (1000), characterized in that, include: The battery (100) according to claim 9 or 10; or, A battery (100) made by the preparation method according to any one of claims 11-16.

18. An electrical appliance (10000), characterized in that, include: The battery (100) according to claim 9 or 10; or, A battery (100) manufactured by the preparation method according to any one of claims 11-16; or, The battery pack (1000) as claimed in claim 17.

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