Battery cell packaging structure and battery

Abstract

The utility model relates to a battery cell packaging structure and a battery. The battery cell packaging structure comprises a protection piece for packaging an electrode assembly, the protection piece comprises a packaging main body wrapping the electrode assembly and a sealing edge extending outwards from the packaging main body; the sealing edge is folded towards the packaging main body and forms a bending part at at least one corner part of the packaging main body; and the far end, far away from the packaging main body, of the bending part is folded towards the packaging main body to form a second bending part. According to the utility model, by adding the second bending part, the structural stability of the bending part is effectively ensured, the springback of the bending position is avoided, the packaging size can be further reduced, the space occupation of the terminal equipment is reduced, and the space utilization rate of the terminal equipment is improved; in addition, the second bending part can also reduce the exposed sharp corner structure of the bending part, so that the relatively flat second bending part is formed, the contact area is also increased by the second bending part, the influence on external electric parts is reduced, and the safety is improved.

Description

Technical Field

[0001] The utility model relates to the field of battery cell packaging, in particular to a battery cell packaging structure and a battery. Background Art

[0002] Battery cells, an essential core component of modern electronic devices, efficiently convert chemical energy into electrical energy, thereby driving various devices. In our daily lives, we experience the presence of batteries almost everywhere, from the mobile phones we carry with us, the cameras that capture beautiful moments, to the laptops and tablets that enable us to work efficiently. They all rely on the stable power they provide. With their exceptional performance, battery cells play a vital role in our lives and work.

[0003] To ensure the safety and stability of battery cells during use, their design and construction must be rigorous and sophisticated. A battery cell typically consists of an electrode assembly and an insulating film. The electrode assembly is the core of the cell, comprising the positive and negative electrodes, and the separator between them. These three components, through their precise arrangement and combination, enable the generation and transmission of electrical energy. An insulating film, such as aluminum-plastic film, wraps around the electrode assembly to ensure internal insulation within the cell and prevent safety incidents such as short circuits.

[0004] The electrode assembly of the battery cell is carefully contained in a packaging bag with a top seal and a side seal to ensure the sealing and structural stability of the battery cell. At the top of the packaging bag, one end of the tab is tightly connected to the electrode assembly, and the other end extends from the top seal to connect to the external device. The top seal is not only a channel for the tab to extend, but also a connection point between the battery body and external electrical connectors (such as the battery protection board, Protection Circuit Module, PCM for short). Although this design ensures a smooth connection between the battery cell and external equipment, it also makes the overall structural size of the battery assembly relatively large, which is undoubtedly an occupation and waste for the increasingly compact structural space of modern terminal equipment.

[0005] The battery protection board (PB) plays a crucial role as a bridge between the battery cell and external devices. It not only manages the battery's charge and discharge but also provides safety protection against overcharge, over-discharge, overcurrent, and short circuits. However, the PB's parallel placement with the top seal increases the overall size of the battery assembly, significantly wasting space in the confined terminal device.

[0006] Patent announcement number CN221708817U discloses a battery cell packaging structure that reduces the package size by folding and sealing the edges. However, the bending portion of this folding structure usually requires the assistance of tape to ensure the folding stability. Otherwise, the bending portion is prone to rebound and the preset bending position cannot be guaranteed. Utility Model Content

[0007] In order to solve the above problems in the prior art, the utility model provides a battery core packaging structure.

[0008] In order to achieve the above-mentioned purpose, the main technical solutions adopted by this utility model include:

[0009] A battery cell packaging structure includes a protective member for packaging an electrode assembly; the protective member includes a packaging body that wraps the electrode assembly and a sealing edge extending outward from the packaging body; the sealing edge is folded toward the packaging body and forms a bending portion at at least one corner of the packaging body; the bending portion is folded toward the packaging body at a distal end away from the packaging body to form a second bending portion.

[0010] Furthermore, the edge seal includes a top edge seal extending from the top surface of the packaging body and side edge seals extending from two opposite side surfaces of the packaging body; the top surface is respectively connected to the side surfaces on both sides; the top edge seal and the side edge seal are respectively connected to the bending portion.

[0011] Furthermore, the top sealing edge includes a straight portion and top sealing end portions located at both ends of the straight portion; the straight portion is bent toward the top surface; the side sealing edge is bent toward the side and a side sealing end portion is formed at one end close to the top sealing edge; the top sealing end portion and the side sealing end portion constitute a bending portion.

[0012] Furthermore, a side seal folding angle is formed at the corner of the side seal end portion located on one side of the side seal edge folding direction; the side seal folding angle is folded toward the top seal end portion; the bending portion is formed by bending the top seal end portion, the side seal end portion, and the side seal folding angle; the second bending portion includes part of the top seal end portion, part of the side seal end portion, and part of the side seal folding angle.

[0013] Furthermore, the side where the side seal fold corner is connected to the side seal edge is the first side; the side where the top seal end is connected to the straight portion is the second side; the angle between the first side and the second side is α, where 60°≤α<180°.

[0014] A battery comprises a battery cell, a protective plate assembly and an injection-molded structural member; the battery cell comprises an electrode assembly; the electrode assembly is externally encapsulated with the above-mentioned packaging structure; a tab is connected to the electrode assembly; the tab extends from the edge seal to the outside of the protective member and is connected to the protective plate assembly; the protective plate assembly comprises a substrate and a flexible circuit board; the flexible circuit board is connected to the substrate; the substrate is arranged on a side of the edge seal away from the packaging body and is arranged opposite to the edge seal; the injection-molded structural member covers the bent portion, the second bent portion, the tab and at least partially covers the substrate.

[0015] Furthermore, the injection-molded structural component covers the bent portion, the second bent portion, the top surface, the top seal, the tab and the substrate; the substrate is arranged on the side of the top seal away from the packaging body and is arranged opposite to the top seal; a boss portion covering the substrate is formed on the side of the injection-molded structural component away from the top surface; the flexible circuit board extends out of the injection-molded structural component and is located on the side of the boss portion away from the top surface.

[0016] Furthermore, a side surface of the boss portion away from the top surface is an arc surface.

[0017] Furthermore, the injection-molded structural component covers the bending portion, the second bending portion, the top surface, the top seal, the tab and partially covers the substrate; the substrate is arranged on the side of the top seal away from the packaging body and is arranged opposite to the top seal; the injection-molded structural component includes a limiting portion that partially covers the upper end surface of the substrate away from the top seal; a substrate exposed portion is formed at the upper end surface not covered by the limiting portion; the distance between the exposed portion of the substrate and the top surface is less than the distance between the limiting portion and the top surface, so as to form an accommodating space between the exposed portion of the substrate and the limiting portion; the flexible circuit board extends out of the injection-molded structural component and is located on the side of the exposed portion of the substrate away from the top surface.

[0018] Furthermore, the tab extends out of the protective piece from the top sealing edge and is folded toward a side of the top sealing edge away from the top surface and then connected to the protection plate assembly, or the tab extends out of the protective piece from the side sealing edge.

[0019] The beneficial effects of the present invention are: 1. By adding a second bending portion, the structural stability of the bending portion is effectively guaranteed, the rebound of the bending position is avoided, and the package size can be further reduced; when the battery cell packaged using the structure of the present invention is placed in a terminal device, the overall structural size of the battery assembly is reduced through the bending portion, the space occupied by the terminal device is reduced, and the space utilization rate of the terminal device is improved.

[0020] 2. The second bending portion can also reduce the exposed sharp corner structure of the bending portion, so that it forms a relatively flat second bending portion. The second bending portion also increases the contact area, reduces the impact on external electrical components, and improves safety.

[0021] 3. The structural optimization of the injection-molded structural parts makes the protection plate assembly better wrapped, with less exposed structure at the end of the battery cell and higher safety.

[0022] 4. The limiting part plays a structural limiting and fixing role on the substrate, ensuring that during the use of the battery, even if it is affected by external forces such as vibration and extrusion, the substrate can remain in a predetermined position, avoiding its displacement and causing loose connections with components such as the tabs and flexible circuit boards, thereby enhancing the stability and reliability of the entire battery structure and ensuring the normal operation of the battery.

[0023] 5. The height difference between the stopper and the exposed portion of the substrate creates a accommodating space, providing the flexible circuit board with greater room to maneuver in the L direction, facilitating its connection to external electrical devices. When the flexible circuit board is housed in the accommodating space, the height of the protruding stopper is reduced, effectively reducing the overall volume of the battery, making it more suitable for smaller, thinner terminal devices and improving the battery's applicability across various devices.

[0024] 6. The distance between the limit part and the top surface is large, and its internal space can be used to accommodate components with larger heights, optimize the internal space layout of the battery, and accommodate more key components within the limited battery volume, which is beneficial to improving the energy density of the battery and enhancing battery performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 This is a schematic diagram of the packaging structure of the utility model;

[0027] Figure 2 This is an enlarged view of the structure A of the utility model;

[0028] Figure 3 This is a schematic diagram of the battery structure of the utility model;

[0029] Figure 4 This is the main view of the battery structure of the utility model;

[0030] Figure 5 yes Figure 4 Enlarged view of middle part B;

[0031] Figure 6 This is a schematic diagram of the battery structure of another embodiment of the utility model;

[0032] Description of reference numerals:

[0033] 100. Protective component; 110. Package body; 111. Top surface; 112. Side surface; 113. Front end surface; 114. Bottom surface; 120. Edge sealing; 121. Top edge sealing; 1211. Straight portion; 1212. Top seal end portion; 1213. Second edge; 122. Side edge sealing; 1221. Side seal end portion; 1222. Side seal fold; 1223. First edge; 123. Bend portion; 124. Second bend portion; 130. Tab; 140. Protective plate assembly; 141. Substrate; 1411. Exposed portion of substrate; 142. Flexible circuit board; 150. Injection molding structural component; 151. Boss portion; 152. Arc surface; 153. Limiting portion. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0035] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," "the other end," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc., should be understood in a broad sense. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; it may refer to a mechanical connection or an electrical connection; it may refer to a direct connection or an indirect connection through an intermediate medium; it may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in this utility model in specific circumstances.

[0037] A battery cell packaging structure includes a protective member 100; the protective member 100 includes a packaging body 110 and a sealing edge 120; the packaging body 110 is used to accommodate an electrode assembly (not shown in the figure); the electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator located therebetween; the positive electrode sheet and the negative electrode sheet are respectively connected to a tab 130; the tab 130 extends from the sealing edge 120 to the outside of the protective member 100.

[0038] The package body 110 is adapted to the shape of the electrode assembly. For example, in this embodiment, Figure 1 As shown, the package body 110 is in the shape of a flat rectangular parallelepiped with rounded corners; the package body 110 includes a top surface 111 located at the top of the package body 110 along the length direction L, a bottom surface 114 located at the bottom of the package body 110 along the length direction L, two side surfaces 112 located on both sides of the package body 110 along the width direction W, a front end surface 113 located at the front side of the package body 110 along the thickness direction T, and a rear end surface (not shown in the figure) located at the rear side of the package body 110 along the thickness direction T; in some embodiments, the package body 110 may also be in the shape of a flat rectangular parallelepiped without or with partially rounded transition edges; in some embodiments, the top surface 111, the bottom surface 114, the side surfaces 112, the front end surface 113, and the rear end surface may be flat surfaces or arc surfaces;

[0039] In one embodiment of the present invention, the edge seal 120 includes a top edge seal 121 extending from the top surface 111 and side edge seals 122 extending from the two side surfaces 112 respectively; both ends of the top edge seal 121 are connected to the two side edge seals 122 respectively;

[0040] In one embodiment of the present invention, the edge seal 120 is folded toward the package body 110 and forms a bent portion 123 at at least one corner of the package body 110; the corner refers to the area where the top surface 111 and the side surface 112 intersect, or the area where the bottom surface 114 and the side surface 112 intersect; in one embodiment, the bent portion 123 is located above the top surface 111, or outside the side surface 112, or below the bottom surface 114; Figure 1As shown, the straight portion 1211 in the middle of the top sealing edge 121 is folded toward the top surface 111 and remains substantially parallel to the top surface 111. The top sealing end portions 1212 at both ends of the top sealing edge 121 are deformed following the folding action of the straight portion 1211 but are not attached to the top surface 111, thereby forming bent portions 123. In another embodiment, the side sealing edge 122 is folded toward the side surface 112, and the side of the side sealing edge 122 close to the top sealing edge 121 and the portions of the two ends of the top sealing edge 121 that are not attached to the top surface 111 form the bent portions 123.

[0041] In one embodiment of the present invention, the bending portion 123 is folded away from the far end of the package body 110 toward the package body 110 to form a second bending portion 124; the bending portion 123 is formed by bending the top sealing end 1212, the side sealing end 1221, and the side sealing folding angle 1222; the second bending portion 124 includes part of the top sealing end 1212, part of the side sealing end 1221, and part of the side sealing folding angle 1222; the second bending portion 124 significantly enhances the overall stability of the bending portion 123, so that it can better maintain the folded state and reduce the rebound amount; this double-layer folding structure further optimizes the space. In the longitudinal dimension (L direction), the buffer space that may have been reserved due to factors such as the rebound of a single layer of folding can be greatly reduced, so that the entire battery cell packaging structure can also be better controlled in the longitudinal height (L direction), thereby more effectively utilizing the three-dimensional space inside the terminal device.

[0042] Corners are relatively weak points in the structure and easily affected by external forces. This double-folding structure is equivalent to adding additional support and reinforcement to the corners, allowing the corners to better withstand and disperse forces when the battery cell is subjected to external forces such as squeezing and collisions, reducing the risks of package damage and electrode assembly displacement caused by external forces, and improving the stability of the overall battery cell structure. By folding the distal end of the bend 123 back toward the package body 110, a mutually restrained structure is formed, which better maintains the folded shape and maintains the preset bend position without or with reduced use of auxiliary fixing materials such as tape, thereby ensuring the stability and consistency of the package structure, which is beneficial for large-scale production and quality control.

[0043] The folded edge seal 120 and the resulting bend 123 and second bend 124 form a tighter package around the electrode assembly. Compared to traditional packaging structures, this better protects the electrode assembly from contact with the external environment, reducing the possibility of electrical safety incidents such as short circuits caused by contact with external objects. Furthermore, this tight package also prevents the insulating film (such as the aluminum-plastic film) from being damaged due to shaking, friction, and other factors during use, further ensuring the insulation performance within the battery cell.

[0044] like Figure 1-2As shown, in one embodiment of the present invention, the top sealing edge 121 includes a straight portion 1211 and top sealing end portions 1212 located at both ends of the straight portion 1211; the straight portion 1211 is folded toward the top surface 111 and is parallel to the top surface 111, and the top sealing end portions 1212 are spaced apart from the top surface 111; the side sealing edge 122 is folded toward the side surface 112; the end of the side sealing edge 122 close to the top sealing edge 121 is the side sealing end portion 1221; the side sealing end portion 1221 is connected to the top sealing end portion 1212 and forms a bending portion 123; in this embodiment, by folding the top sealing edge 121 and the side sealing edge 122, the package size can be effectively reduced. Specifically, the size of the battery packaged using the structure of the present invention in the longitudinal direction L can be reduced, thereby meeting the size requirements of external electrical equipment. In addition, since the side seals 122 and the top seal 121 are relatively weak components in the battery, by bending the side seals 122 and the top seal 121 toward the package body 110, the side seals 122 and the top seal 121 are not easily damaged by collision or the like.

[0045] In one embodiment of the present invention, the side seal end portion 1221 is connected to the top seal end portion 1212 and forms a bending portion 123; the bending portion 123 is away from the distal end of the packaging body 110, that is, the sharp angle formed by the intersection of the top seal end portion 1212 and the side seal end portion 1221, and the distal end is folded toward the packaging body 110 to form a second bending portion 124, so that the position of the side seal end portion 1221 and the top seal end portion 1212 can be locked by the second bending portion 124 to reduce the possibility of their rebound; and the second bending portion 124 can further compress the dimension in the L direction; Figure 1 As shown, the distal end of the bent portion 123 away from the package body 110 is folded toward the straight portion 1211; in another embodiment, the distal end of the bent portion 123 away from the package body 110 can also be folded in the opposite direction, that is, folded away from the straight portion 1211, which is also feasible;

[0046] In one embodiment of the present invention, the top sealing edge 121 is folded toward the top surface 111 and is parallel to the top surface 111, and the side sealing edge 122 is folded toward the side surface 112; the end of the side sealing edge 122 close to the top sealing edge 121 is spaced apart from the side surface 112, so that the bending portion 123 is located on the outside of the side surface 112 (not shown in the figure); compared with the previous embodiment, the bending portion 123 of this embodiment is located on the side surface 112, which can maximize the size utilization in the length direction L, but the packaging size in the width direction W is affected.

[0047] In one embodiment of the present invention, the side seal end portion 1221 is located at a corner on the side of the folding direction of the side seal edge 122 to form a side seal folding angle 1222; the side seal folding angle 1222 is folded toward the top seal end portion 1212; it should be noted that in this example, the folding direction of the side seal edge 122 is as follows: Figure 1 As shown, the side seal folding is performed from the side surface 112 to the front end surface 113, and the side seal folding angle 1222 is actually the corner of the upper end of the side seal 122 facing outward; when the folding direction is from the side surface 112 to the rear end surface, the corner is also the corner of the upper end of the side seal 122 facing outward; by folding the side seal folding angle 1222 toward the top seal end 1212, the exposed sharp part of the battery cell can be effectively reduced during packaging, reducing the risk and avoiding damage to external electrical equipment or circuits; the sharp part refers to the contact between the top seal 121 and the side seal The sharp corner formed by the folding of the edge 122 and the sharp corner (side seal folding angle 1222) at the intersection of the top seal edge 121 and the side seal edge 122; at the same time, the side seal folding angle 1222 can also reduce the height of the bent portion 123 extending from the top surface 111 to a certain extent after folding. By folding the side seal folding angle 1222, the side seal end portion 1221 and the top seal end portion 1212 are equivalent to shrinking inward, which can ensure the stability after folding and reduce the overall size of the bent portion 123, thereby reducing the dimension in the length direction L after packaging;

[0048] like Figure 2 As shown, in one embodiment of the present invention, the side where the side seal fold 1222 is connected to the side seal edge 122 is the first side 1223; the side where the top seal end 1212 is connected to the straight portion 1211 is the second side 1213; the angle between the first side 1223 and the second side 1213 is α, where 60°≤α is less than 180°; since the material of the protective member 100 is usually an aluminum-plastic film, which has a certain thickness and hardness, and the protruding dimensions of the top seal edge 121 and the side seal edge 122 are limited, Usually, only one side can be folded once, and the overlapping part is difficult to fold again. Therefore, the bent portion 123 is difficult to completely eliminate by means of inward folding or other means. By folding the side seal folding angle 1222 inward, the stability of the structure and the size can be minimized as much as possible. In another embodiment, the α=90°, and the side seal folding angle 1222 is arranged adjacent to the second side 1213 after folding. In another embodiment, the side seal folding angle 1222 can be folded inward toward the inner side surface 112 of the side seal end portion 1221 close to the side surface 112.

[0049] The size of the angle α is mainly determined by the direction of the force applied during folding and the size of the folding area. If the angle α is too small, the folding effect of the side seal fold angle 1222 is not good. When α=60°, the length T of the upper end of the side seal end 1221 in the thickness direction is relatively large, that is, the overall folding area of the side seal fold angle 1222 is small; and when α=90°, the length T of the upper end of the side seal end 1221 in the thickness direction is basically zero, that is, the overall folding area of the side seal fold angle 1222 is large. Figure 1 Before folding, the shape of the side seal end portion 1221 is approximately a square. At this time, the side seal folding angle 1222 is equivalent to a triangle formed by folding along the diagonal line of the square. Therefore, the length of the upper end portion of the side seal end portion 1221 in the thickness direction T is substantially zero. When α is greater than 90°, for example, when α=120°, the side seal folding angle 1222 will also drive the folding of part of the second side 1213 when folding, so that the first side 1223 is as close to the top surface 111 as possible. It can be understood that when α is greater than 90°, the folding During this process, a portion of the second edge 1213 connected to the side seal end portion 1221 is driven closer to the top surface, thereby further reducing the height of the bent portion 123 extending out of the top surface 111, which can more effectively control the dimension in the length direction L. However, folding becomes more difficult when α is greater than 90°. In one embodiment, α=150°. It should be noted that, due to the hardness of the material itself, when the side seal fold angle 1222 is folded, α cannot be equal to 180°, but can only be as close to 180° as possible.

[0050] In one embodiment of the present invention, the top sealing edge 121 may extend from the middle of the top surface 111, or from the intersection of the top surface 111 and the rear end surface; the side sealing edge 122 may extend from the middle of the side surface 112, or from the intersection of the side surface 112 and the rear end surface;

[0051] In one embodiment of the present invention, the material selection of the protective member 100 is diverse, among which common ones include stainless steel, aluminum alloy, heat shrink film, insulation film and aluminum-plastic composite film (usually referred to as aluminum-plastic film) formed by aluminum material.

[0052] For example, aluminum-plastic film, a protective element 100, has been widely used in battery protection due to its unique structure and properties. Aluminum-plastic film primarily consists of multiple layers, including a nylon layer, an aluminum foil layer, a heat-seal layer, and an adhesive bonding these layers. Each layer performs a specific function, collectively providing comprehensive battery protection.

[0053] The innermost layer of the aluminum-plastic film is the heat-seal layer. This layer primarily serves as a sealant, ensuring the battery's tightness during packaging. The heat-seal layer offers excellent electrolyte resistance, preventing corrosion inside the battery. It also provides excellent insulation and puncture resistance, ensuring the battery does not experience safety incidents caused by internal short circuits when subjected to external impact.

[0054] The middle layer is aluminum foil. Made from pure aluminum or an aluminum-iron alloy, these materials react with oxygen in the air at room temperature to form a dense oxide film. This oxide film effectively prevents oxygen and moisture from entering the battery, protecting the battery from environmental corrosion. Furthermore, the aluminum foil offers excellent electrical conductivity, facilitating current transmission within the battery.

[0055] The outermost layer is nylon. Known for its excellent impact and puncture resistance, the nylon layer protects the aluminum foil from scratches and abrasion. During battery use, the nylon layer effectively mitigates shock and vibration caused by drops, collisions, and other accidents, thereby ensuring battery stability and safety.

[0056] like Figure 3 As shown, a battery includes a battery cell, a protection plate assembly 140 and an injection-molded structural member 150; the battery cell includes an electrode assembly; the electrode assembly is externally encapsulated with the above-mentioned packaging structure; the electrode assembly is connected to a tab 130; the tab 130 extends from the edge seal 120 to the outside of the protective member 100 and is connected to the protection plate assembly 140; the protection plate assembly 140 includes a substrate 141 and a flexible circuit board 142; the flexible circuit board 142 is connected to the substrate 141; the substrate 141 is arranged on a side of the edge seal 120 away from the packaging body 110 and is arranged opposite to the edge seal 120; the injection-molded structural member 150 covers the bending portion 123, the second bending portion 124, the tab 130 and at least partially covers the substrate 141.

[0057] In one embodiment, the injection-molded structural member 150 is covered by injection molding on the bent portion 123, the second bent portion 124, the tab 130, and at least partially covers the substrate 141. The top of the injection-molded structural member 150 can be set to a flat surface, thereby effectively eliminating the sharp end of the bent portion 123. The injection-molded structural member 150 does not directly increase the size of the package structure in the length direction L, but only fully covers the bent portion 123, which can further increase safety and prevent the bent portion 123 from rebounding after bending. Furthermore, during pressure injection molding, the pressure during injection molding can also squeeze the bent portion 123, which can further reduce the protruding height of the bent portion 123.

[0058] In one embodiment, the injection molded structure 150 covers the bent portion 123, the second bent portion 124, the top surface 111, the top sealing edge 121, the tab 130, and the substrate 141. By further covering the top surface 111 and the top sealing edge 121, the connection stability between the injection molded structure 150 and the packaging structure is enhanced. Furthermore, covering the substrate 141 can reduce the exposed structure of the electrical components, thereby further improving their safety.

[0059] In one embodiment, the substrate 141 is arranged on a side of the top sealing edge 121 away from the package body 110 and is arranged opposite to the top sealing edge 121; a boss portion 151 covering the substrate 141 is formed on a side of the injection molding structure 150 away from the top surface 111; the flexible circuit board 142 extends out of the injection molding structure 150 and is located on a side of the boss portion 151 away from the top surface 111; usually, the flexible circuit board 142 is connected to both ends of the substrate 141, and the flexible circuit board 142 includes a first connecting section, a bending section and a second connecting section connected in sequence. The first connecting section is connected to the end of the substrate 141 and is usually parallel to the substrate 141. The first connecting section is also used to extend out of the injection molding structure 150. The second connecting section is located on the side of the boss portion 151 away from the top surface 111. The bending section is used to connect the first connecting section and the second connecting section. This bending structure is also conducive to controlling the L-direction dimension.

[0060] like Figure 4 、 Figure 5 As shown, in one embodiment, the side of the boss portion 151 away from the top surface 111 is an arc surface 152. The arc surface 152 can make the force distribution of the battery more uniform when subjected to external force, and avoid stress concentration on certain specific points or edges. When the arc surface 152 structure is squeezed, it can better transfer and disperse the pressure to the surrounding structure, so that the boss portion 151 and even the entire battery structure are more stable when under pressure, which improves the compressive strength of the battery to a certain extent and reduces the possibility of deformation or damage to the battery due to external pressure. The arc surface 152 has no sharp edges and corners, which can effectively avoid the risk of puncture due to contact with other objects during the use, transportation or storage of the battery.

[0061] like Figure 6As shown, in one embodiment, the injection molding structure 150 covers the bending portion 123, the second bending portion 124, the top surface 111, the top sealing edge 121, the tab 130 and partially covers the substrate 141; the substrate 141 is arranged on a side of the top sealing edge 121 away from the package body 110 and is arranged opposite to the top sealing edge 121; the injection molding structure 150 includes a portion covering the substrate 141 away from the top sealing edge 121 1; the upper end surface not covering the limiting portion 153 forms a substrate exposed portion 1411; the distance between the substrate exposed portion 1411 and the top surface 111 is less than the distance between the limiting portion 153 and the top surface 111, so as to form an accommodating space between the substrate exposed portion 1411 and the limiting portion 153; the flexible circuit board 142 extends out of the injection molded structural component 150 and is located on a side of the substrate exposed portion 1411 away from the top surface 111.

[0062] The limiting portion 153 plays a structural limiting and fixing role on the substrate 141, ensuring that during the use of the battery, even if it is affected by external forces such as vibration and extrusion, the substrate 141 can remain in a predetermined position, avoiding displacement and causing loose connections with components such as the tab 130 and the flexible circuit board 142, thereby enhancing the stability and reliability of the entire battery structure and ensuring the normal operation of the battery.

[0063] The height difference between the stopper 153 and the exposed portion 1411 of the substrate creates a accommodating space, providing greater room for the flexible circuit board 142 to move in the L direction, facilitating its connection to external electrical devices. When the flexible circuit board 142 is housed within the accommodating space, its height above the top surface of the protruding stopper 153 is reduced, effectively reducing the overall volume of the battery. This makes the battery more suitable for smaller, thinner, and lighter terminal devices, improving the battery's applicability across a wide range of devices.

[0064] The distance between the limiting portion 153 and the top surface 111 is relatively large, and its internal space can be used to accommodate components with larger heights, thereby optimizing the internal spatial layout of the battery. More key components can be accommodated within the limited battery volume, which is beneficial to improving the energy density of the battery and enhancing battery performance.

[0065] The injection molded plastic structural member 150 covers the bend 123, the second bend 124, the top surface 111, the top seal 121, the tab 130, and a portion of the substrate 141, effectively isolating these components from the outside world, preventing the tab from short-circuiting due to contact with foreign objects, or water vapor from corroding internal components, thereby reducing the risk of electrical failure and ensuring the safety of the battery. The comprehensive coverage of the key battery parts by the injection molded plastic structural member not only provides insulation, but also buffers external impact forces to a certain extent, protecting the fragile internal electrode components, tabs, and circuit boards, reducing damage caused by collisions and friction, extending the battery's service life, and reducing its cost.

[0066] In one embodiment of the present invention, the electrode assembly is connected to a tab 130; the tab 130 extends from the edge seal 120 to the outside of the protective member 100; the tab 130 can extend from the top edge seal 121 or the side edge seal 122 to the protective member 100; the tab 130 includes a positive tab and a negative tab; in another embodiment, Figure 1 As shown, the tab 130 extends out of the protective member 100 from the top sealing edge 121, is folded toward a side surface 112 of the top sealing edge 121 away from the top surface 111, and is connected to the protective plate assembly 140; the protective plate assembly 140 is arranged on the straight portion 1211 and is parallel to the top surface 111; the thickness of the protective plate assembly 140 is equivalent to the thickness of the bent portion 123, thereby offsetting the influence of the height of the bent portion 123 and reasonably utilizing the space; and the straight portion 1211 is flat and folded toward the top surface 111, so that the surface of the straight portion 1211 is a relatively flat plane, which can ensure the stability of the protective plate assembly 140 during installation, that is, the folding package of the sealing edge 120 will not affect the installation of the protective plate assembly 140; in another embodiment, the tab 130 extends out of the protective member 100 from the side sealing edge 122.

[0067] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the description and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A battery cell packaging structure, characterized in that: The invention comprises a protective member (100) for packaging an electrode assembly; the protective member (100) comprises a packaging body (110) that wraps the electrode assembly, and an edge seal (120) that extends outward from the packaging body (110); the edge seal (120) is folded toward the packaging body (110) and forms a bending portion (123) at at least one corner of the packaging body (110); the bending portion (123) is folded away from the far end of the packaging body (110) toward the packaging body (110) to form a second bending portion (124).

2. A battery cell packaging structure according to claim 1, characterized in that: The edge seal (120) comprises a top edge seal (121) extending from a top surface (111) of the packaging body (110) and side edge seals (122) extending from two opposite side surfaces (112) of the packaging body (110); the top surface (111) is respectively connected to the side surfaces (112) on both sides; the top edge seal (121) and the side edge seals (122) are respectively connected to the bending portion (123).

3. A battery cell packaging structure according to claim 2, characterized in that: The top sealing edge (121) comprises a straight portion (1211) and a top sealing end portion (1212) located at the end of the straight portion (1211); the straight portion (1211) is bent toward the top surface (111); the side sealing edge (122) is bent toward the side surface (112) and a side sealing end portion (1221) is formed at an end close to the top sealing edge (121); the top sealing end portion (1212) and the side sealing end portion (1221) constitute a bent portion (123).

4. A battery cell packaging structure according to claim 3, characterized in that: The side seal end portion (1221) is located at a corner on one side of the folding direction of the side seal edge (122) to form a side seal fold angle (1222); the side seal fold angle (1222) is folded toward the top seal end portion (1212); the bending portion (123) is formed by bending the top seal end portion (1212), the side seal end portion (1221), and the side seal fold angle (1222); the second bending portion (124) includes part of the top seal end portion (1212), part of the side seal end portion (1221), and part of the side seal fold angle (1222).

5. A battery cell packaging structure according to claim 4, characterized in that: The side where the side seal fold angle (1222) is connected to the side seal edge (122) is the first side (1223); the side where the top seal end (1212) is connected to the straight portion (1211) is the second side (1213); the angle between the first side (1223) and the second side (1213) is α, wherein 60°≤α<180°.

6. A battery, characterized in that: The invention comprises a battery cell, a protection plate assembly (140) and an injection molding structure (150); the battery cell comprises an electrode assembly; the electrode assembly is externally encapsulated with a packaging structure as claimed in any one of claims 2 to 5; a pole ear (130) is connected to the electrode assembly; the pole ear (130) extends from the edge seal (120) to the outside of the protection member (100) and is connected to the protection plate assembly (140); the protection plate assembly (140) comprises a substrate (141) and a flexible circuit board (142); the flexible circuit board (142) is connected to the substrate (141); the substrate (141) is arranged on a side of the edge seal (120) away from the packaging body (110) and is arranged opposite to the edge seal (120); the injection molding structure (150) covers the bending portion (123), the second bending portion (124), the pole ear (130) and at least partially covers the substrate (141).

7. A battery according to claim 6, characterized in that: The injection-molded plastic structural component (150) covers the bending portion (123), the second bending portion (124), the top surface (111), the top sealing edge (121), the pole ear (130) and the substrate (141); the substrate (141) is arranged on a side of the top sealing edge (121) away from the packaging body (110) and is arranged opposite to the top sealing edge (121); a boss portion (151) covering the substrate (141) is formed on a side of the injection-molded plastic structural component (150) away from the top surface (111); the flexible circuit board (142) extends out of the injection-molded plastic structural component (150) and is located on a side of the boss portion (151) away from the top surface (111).

8. A battery according to claim 7, characterized in that: A side surface of the boss portion (151) away from the top surface (111) is an arc surface (152).

9. A battery according to claim 6, characterized in that: The injection molding structure (150) covers the bending portion (123), the second bending portion (124), the top surface (111), the top sealing edge (121), the pole ear (130), and partially covers the substrate (141); the substrate (141) is arranged on a side of the top sealing edge (121) away from the packaging body (110) and is arranged opposite to the top sealing edge (121); the injection molding structure (150) includes a portion covering the upper end of the substrate (141) away from the top sealing edge (121); The limiting portion (153) is formed on the upper end surface; a substrate exposed portion (1411) is formed at the portion of the upper end surface that is not covered with the limiting portion (153); the distance between the substrate exposed portion (1411) and the top surface (111) is smaller than the distance between the limiting portion (153) and the top surface (111), so as to form an accommodation space between the substrate exposed portion (1411) and the limiting portion (153); the flexible circuit board (142) extends out of the injection molding structure (150) and is located on a side of the substrate exposed portion (1411) away from the top surface (111).

10. A battery according to claim 6, characterized in that: The pole ear (130) extends out of the protective member (100) from the top sealing edge (121) and is folded toward a side surface (112) of the top sealing edge (121) away from the top surface (111) and is then connected to the protective plate assembly (140), or the pole ear (130) extends out of the protective member (100) from the side sealing edge (122).

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