Injection molded battery packaging structure

Abstract

The utility model relates to a kind of injection-molded battery packaging structures, including electric core;Electric core includes electrode assembly and the protective member of electrode assembly outer packaging;Protective member includes the encapsulation main body of wrapping electrode assembly, edge, and edge is folded towards the encapsulation main body and forms bending portion in the at least one corner portion of encapsulation main body;Protective plate assembly includes substrate and flexible circuit board;Substrate is located in the side of edge away from encapsulation main body where bending portion is and is oppositely arranged with edge;Substrate exposed portion is formed in the place where substrate is not covered by injection-molded plastic structure piece;Substrate exposed portion includes at least one exposed surface;At least one exposed surface is located on the two sides of substrate oppositely arranged along the thickness direction of electric core.The utility model forms exposed surface on the two sides of substrate oppositely arranged along the thickness direction of electric core, so that substrate has greater available size, and the utilization of substrate is higher;While the size of injection-molded packaging can be smaller, exposed surface is also conducive to the rapid heat dissipation of substrate.

Description

Technical Field

[0001] This utility model relates to the field of battery cell packaging, and in particular to an injection-molded battery packaging structure. Background Technology

[0002] Battery cells, as an indispensable core component of modern electronic devices, essentially convert chemical energy into electrical energy to power various devices. In daily life, we experience the presence of battery cells almost everywhere, from our mobile phones and cameras that capture precious moments, to laptops and tablets that help us work efficiently—all rely on the stable power provided by battery cells. With their superior performance, battery cells play a crucial role in people's lives and work.

[0003] To ensure the safety and stability of battery cells during use, their design and construction must be rigorous and precise. A battery cell typically consists of an electrode assembly and an insulating film. The electrode assembly is the core of the cell, including the positive electrode, the negative electrode, and the insulating film between them. These three components, through precise arrangement and combination, enable the generation and transmission of electrical energy. The insulating film, such as an aluminum-plastic film, is used to wrap the electrode assembly to ensure the insulation of the cell's internal structure and prevent safety accidents such as short circuits.

[0004] The electrode assembly of the battery cell is carefully housed in a packaging bag with top and side seals to ensure the cell's airtightness and structural stability. At the top of the bag, one end of the tab is tightly connected to the electrode assembly, while the other end extends from the top seal to connect to external devices. The top seal not only serves as a channel for the tab to extend but also as a connection point between the battery body and external electrical connectors (such as the battery protection circuit module, PCM). While this design ensures smooth connection between the cell and external devices, it also results in a relatively large overall size of the battery assembly, which is undoubtedly a waste of space in the increasingly compact structures of modern terminal devices.

[0005] The battery protection board, acting as a bridge between the battery cell and external devices, plays a crucial role. It not only manages the battery's charging and discharging but also provides safety protection against overcharging, over-discharging, overcurrent, and short circuits. However, because the protection board is positioned parallel to the top seal, the overall size of the battery assembly increases, resulting in significant waste of the limited structural space available in the terminal equipment. Utility Model Content

[0006] To address the aforementioned problems in the prior art, this utility model provides an injection-molded battery packaging structure.

[0007] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0008] An injection-molded battery packaging structure includes a battery cell; the battery cell includes an electrode assembly and a protective component encapsulating the electrode assembly; the protective component includes a packaging body encapsulating the electrode assembly and a sealing edge extending outward from the packaging body, the sealing edge being folded toward the packaging body and forming a bent portion at at least one corner of the packaging body; a tab is connected to the electrode assembly; the tab extends from the sealing edge to the outside of the protective component and is connected to a protective plate assembly; the protective plate assembly includes a substrate and a flexible circuit board; the flexible circuit board is connected to the substrate; the substrate is disposed on the side of the sealing edge where the bent portion is located away from the packaging body and is disposed opposite to the sealing edge; a portion of the substrate is covered with an injection-molded structural component; the portion of the substrate not covered by the injection-molded structural component forms an exposed substrate portion; the exposed substrate portion includes at least one exposed surface; at least one exposed surface is located on at least one of two outer surfaces of the substrate disposed opposite to each other along the thickness direction of the battery cell.

[0009] In one embodiment of the present invention, an insulating gasket is provided between the substrate and the sealing edge where the bent portion is located; the injection-molded structural component is provided with a gasket that at least partially covers the exposed surface.

[0010] In one embodiment of this utility model, the flexible circuit board and the substrate are electrically connected to the end face of the packaging body.

[0011] In one embodiment of the present invention, the injection-molded structural component covers the bent portion, the tab, and partially covers the substrate; the injection-molded structural component includes a limiting portion that covers at least the middle of the upper end face of the substrate; the limiting portion has a maximum distance between itself and the encapsulation body at the middle of the substrate, so as to form an accommodating portion with a relatively small distance from the encapsulation body at the end of the upper end face of the substrate; the flexible circuit board is at least partially disposed in the accommodating portion.

[0012] In one embodiment of this utility model, the injection-molded structural component covers the bent portion to form a corner seal; the injection-molded structural component includes a recess located between the corner seal and the receiving portion; the distance between the recess and the encapsulation body is less than the distance between the receiving portion and the encapsulation body.

[0013] In one embodiment of the present invention, the flexible circuit board includes a first segment, a bent segment, and a second segment connected in sequence; the first segment is at least partially located in the receiving portion; the first segment is provided with a connector for electrical connection with external electrical equipment; the first segment and the second segment are arranged opposite to each other along a second direction; the bent segment is at least partially located in the recessed portion.

[0014] In one embodiment of this utility model, the limiting part is provided with a hollowed-out part along the thickness direction of the battery cell.

[0015] In one embodiment of this utility model, the end face of the substrate relative to the packaging body is the lower end face, and the end face away from the packaging body and relative to the lower end face is the upper end face; electronic devices are distributed on both the upper and lower end faces of the substrate; the height of the electronic devices located at both ends of the upper end face is less than the height of the electronic devices located in the middle of the upper end face.

[0016] In one embodiment of this utility model, the minimum thickness of the injection-molded structural component covering the electronic device is 0.3mm to 1.5mm, and the minimum thickness of the vacant area on the upper surface of the substrate where no electronic device is disposed is 0.3mm to 1.5mm.

[0017] In one embodiment of this utility model, multiple battery cells are stacked or arranged side by side.

[0018] The beneficial effects of this utility model are: by forming exposed surfaces on two sides of the substrate that are arranged opposite to each other along the thickness direction of the battery cell, the substrate has a larger usable size and a higher utilization rate; at the same time, the size of the injection molding package can be smaller, and the exposed surfaces are also conducive to the rapid heat dissipation of the substrate. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the battery cell structure of this utility model;

[0021] Figure 2 This is an enlarged view of part A of the structure of this utility model;

[0022] Figure 3 This is an exploded view of the structure of this utility model;

[0023] Figure 4 This is a schematic diagram of the substrate structure of this utility model;

[0024] Figure 5 This is a schematic diagram of the internal structure of the present invention in the thickness direction;

[0025] Figure 6 yes Figure 5 Cross-sectional views of multiple embodiments at the BB position;

[0026] Figure 7 This is a three-dimensional structural view of the present invention;

[0027] Figure 8 This is a perspective view of another embodiment of the structure of this utility model;

[0028] Figure 9 This is a schematic diagram of the encapsulation structure of multiple injection-molded batteries according to this utility model;

[0029] Figure 10 yes Figure 9 Enlarged schematic diagram of section C in b;

[0030] Figure 11 This is a schematic diagram of a packaging structure in which multiple battery cells are stacked or arranged side by side.

[0031] Explanation of reference numerals in the attached figures:

[0032] 10. Battery cell; 100. Protective component; 110. Encapsulation body; 111. Top surface; 112. Side surface; 113. Front end surface; 114. Bottom surface; 120. Sealing edge; 121. Top sealing edge; 1211. Straight portion; 1212. Top sealing end; 1213. Second side; 122. Side sealing edge; 1221. Side sealing end; 1222. Side sealing angle; 1223. First side; 123. First bend; 124. Second bend; 125. Bending portion; 130. Electrode tab; 140. Protective board assembly; 141. Substrate; 1411. Exposed portion of substrate; 1412. Exposed surface; 1 413. Electronic component; 1414. Top surface; 1415. Bottom surface; 1416. Left surface; 1417. Right surface; 1418. Front side; 1419. Rear side; 142. Flexible circuit board; 1421. First section; 1422. Bending section; 1423. Second section; 1424. Connector; 1425. Second bending section; 1426. Buffer section; 150. Injection molded structural component; 151. Limiting section; 1511. Flat section; 152. Receiving section; 153. Corner sealing section; 154. Recessed section; 155. Hollowed-out section; 160. Insulating gasket; 170. Gasket. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0034] 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," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] like Figure 1 As shown, the first direction is parallel to the width direction W, the second direction is parallel to the length direction L, and the thickness direction T is perpendicular to both the width direction W and the length direction L. These definitions are for illustrative purposes only and do not limit the scope of the claims. The directions described above and shown in the figures are examples and may, of course, differ based on implementation and use.

[0037] An injection-molded battery packaging structure includes a battery cell 10; the battery cell 10 includes an electrode assembly (not shown) and a protective component 100 encapsulating the electrode assembly; the protective component 100 includes a packaging body 110 that wraps the electrode assembly and a sealing edge 120 extending outward from the packaging body 110; the packaging body 110 is used to house the electrode assembly (not shown); the electrode assembly includes a positive electrode, a negative electrode, and a separator between the two; tabs 130 are respectively connected to the positive electrode and the negative electrode; the tabs 130 extend from the sealing edge 120 to the outside of the protective component 100.

[0038] In one embodiment of this utility model, the electrode tab 130 can extend from the top sealing edge 121 or the side sealing edge 122 out of the protective member 100; the electrode tab 130 includes a positive electrode tab and a negative electrode tab; in another embodiment, such as Figure 1 As shown, the tab 130 extends from the top sealing edge 121 beyond the protective member 100 and folds towards the side 112 away from the top surface 111 of the top sealing edge 121 before connecting to the protective plate assembly 140. The protective plate assembly 140 is disposed in the straight portion 1211 and is parallel to the top surface 111. The thickness of the protective plate assembly 140 is comparable to the thickness of the first bending portion 123, thereby offsetting the influence of the height of the first bending portion 123 and making reasonable use of space. Furthermore, the straight portion 1211 is folded flat towards the top surface 111, making the surface of the straight portion 1211 a relatively flat plane, which can ensure the stability of the protective plate assembly 140 during installation. That is, the folding and sealing of the sealing edge 120 will not affect the installation of the protective plate assembly 140. In another embodiment, the tab 130 extends from the side sealing edge 122 beyond the protective member 100.

[0039] The encapsulation body 110 is adapted to the shape of the electrode assembly, for example, in this embodiment, such as Figure 1 As shown, the packaging body 110 is a flat, rounded cuboid. The packaging body 110 includes a top surface 111 located at the top along the length direction L, a bottom surface 114 located at the bottom along the length direction L, two side surfaces 112 located on both sides along the width direction W, a front surface 113 located on the front side along the thickness direction T, and a rear surface (not shown in the figure) located on the rear side along the thickness direction T. In some embodiments, the packaging body 110 may also be a flat cuboid without rounded corner transition edges or with partially rounded corner transition edges. In some embodiments, the top surface 111, bottom surface 114, side surfaces 112, front surface 113, and rear surface may be planar or arc-shaped surfaces.

[0040] In one embodiment of the present invention, the sealing edge 120 includes a top sealing edge 121 extending from the top surface 111 and side sealing edges 122 extending from the two side surfaces 112 respectively; the two ends of the top sealing edge 121 are respectively connected to the two side sealing edges 122.

[0041] In one embodiment of this utility model, the sealing edge 120 is folded toward the encapsulation body 110 and forms a bent portion 125 at at least one corner of the encapsulation body 110; the bent portion 125 may include a first bent portion 123; the corner refers to the area where the top surface 111 meets the side surface 112 or the area where the bottom surface 114 meets the side surface 112; in one embodiment, the first bent portion 123 is located above the top surface 111, or outside the side surface 112, or below the bottom surface 114; as Figure 1 As shown, the straight portion 1211 in the middle of the top sealing edge 121 is folded toward the top surface 111 and remains basically parallel to the top surface 111. The top sealing ends 1212 at both ends of the top sealing edge 121 deform following the folding action of the straight portion 1211 but do not adhere to the top surface 111, thus forming the first bending portion 123. In another embodiment, the side sealing edge 122 is folded toward the side 112. The side of the side sealing edge 122 near the top sealing edge 121 and the portions of the top sealing edge 121 that do not adhere to the top surface 111 constitute the first bending portion 123.

[0042] In one embodiment of this utility model, the bending portion 125 may include a first bending portion 123 and a second bending portion 124; the far end of the first bending portion 123 away from the packaging body 110 is folded toward the packaging body 110 to form the second bending portion 124; the first bending portion 123 is formed by bending a top sealing end 1212, a side sealing end 1221, and a side sealing angle 1222; the second bending portion 124 includes a portion of the top sealing end 1212, a portion of the side sealing end 1221, and a portion of the side sealing angle 1222; the second bending portion 124 significantly enhances the overall stability of the first bending portion 123, enabling it to better maintain its folded state and reduce springback; this double-layer folding structure further optimizes space. In the longitudinal dimension (L direction), the buffer space that might have needed to be reserved due to factors such as single-layer folding springback can be greatly reduced, allowing the entire cell packaging structure to be better controlled in the longitudinal height (L direction), thereby making more effective use of the three-dimensional space inside the terminal device.

[0043] The corners are relatively weak points in the structure and are easily affected by external forces. This double-folded structure is equivalent to adding extra support and reinforcement to the corners, enabling them to better withstand and disperse forces when the battery cell is subjected to external forces such as compression and collision. This reduces the risk of package breakage and electrode assembly displacement caused by external forces, and improves the overall stability of the battery cell structure. By folding the distal end of the first bending portion 123 back towards the package body 110, a mutually constraining structure is formed, which allows the folded shape to be better maintained. The preset bending position can be guaranteed 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.

[0044] The folded edge 120 and the formed first bend 123 and second bend 124 can form a tighter wrap around the electrode assembly. Compared with the traditional packaging structure, this can better prevent the electrode assembly from contacting the external environment, reducing the possibility of electrical safety accidents such as short circuits caused by contact with external objects. At the same time, this tight wrap can also prevent the insulating film (such as aluminum-plastic film) from being damaged due to shaking, friction, etc. during use, further ensuring the insulation performance inside the battery cell.

[0045] like Figure 1-2 As 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 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 near 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 first bending portion 123; in this embodiment, by folding the top sealing edge 121 and the side sealing edge 122, the packaging size can be effectively reduced. Specifically, the length direction L of the battery packaged using the structure of the present invention can be reduced, thereby meeting the size requirements of external electrical equipment. In addition, since the side seal 122 and top seal 121 are relatively weak components in the battery, by bending the side seal 122 and top seal 121 toward the encapsulation body 110, the side seal 122 and top seal 121 are not easily damaged by collisions or other reasons.

[0046] In one embodiment of this utility model, the side sealing end 1221 is connected to the top sealing end 1212 and forms a first bending portion 123; the far end of the first bending portion 123 away from the encapsulation body 110, that is, the sharp angle formed at the junction of the top sealing end 1212 and the side sealing end 1221, is folded toward the encapsulation body 110 to form a second bending portion 124, thereby locking the position of the side sealing end 1221 and the top sealing end 1212 by the second bending portion 124, reducing the possibility of springback; and the second bending portion 124 can further compress the dimension in the L direction; such as Figure 1 As shown, the far end of the first bent portion 123 away from the encapsulation body 110 is folded toward the straight portion 1211; in another embodiment, the far end of the first bent portion 123 away from the encapsulation body 110 can also be folded in the opposite direction, that is, folded away from the straight portion 1211, which is also feasible.

[0047] In one embodiment of this utility model, the top sealing edge 121 is folded toward the top surface 111 and 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 near the top sealing edge 121 is spaced apart from the side surface 112, so that the first bent portion 123 is located outside the side surface 112 (not shown in the figure); compared with the previous embodiment, the first bent portion 123 is located on the side surface 112, which can maximize the utilization of the length direction L, but the packaging size in the width direction W is affected.

[0048] In one embodiment of this utility model, the corner of the side sealing end 1221 located on one side of the folding direction of the side sealing edge 122 forms a side sealing fold angle 1222; the side sealing fold angle 1222 folds toward the top sealing end 1212; it should be noted that in this example, the folding direction of the side sealing edge 122 is as follows Figure 1As shown, the folding is performed from the side 112 towards the front end 113. The side sealing angle 1222 is actually the outer corner of the upper end of the side sealing edge 122. When the folding direction is from the side 112 towards the rear end, the corner is also the outer corner of the upper end of the side sealing edge 122. Folding the side sealing angle 1222 towards the top sealing end 1212 can effectively reduce the exposed sharp parts during cell packaging, reduce risks, and avoid damage to external electrical equipment or lines. The sharp parts refer to the top sealing edge 121 and the side sealing edge 1222. The sharp corner formed after folding 22, as well as the sharp corner (side sealing angle 1222) inherent at the junction of the top sealing edge 121 and the side sealing edge 122; at the same time, the side sealing angle 1222 can also reduce the height of the first bending part 123 extending out of the top surface 111 to a certain extent after folding. Folding the side sealing angle 1222 is equivalent to shrinking the side sealing end 1221 and the top sealing end 1212 inward, which can both ensure the stability after folding and reduce the overall size of the first bending part 123, thereby reducing the dimension L in the length direction after packaging;

[0049] like Figure 2 As shown, in one embodiment of this utility model, the side connecting the side sealing angle 1222 and the side sealing edge 122 is the first side 1223; the side connecting the top sealing end 1212 and the straight portion 1211 is the second side 1213; the included angle between the first side 1223 and the second side 1213 is α, where 60°≤α<180°; since the material of the protective component 100 is usually aluminum-plastic film, it has a certain thickness and hardness, and the extension dimensions of the top sealing edge 121 and the side sealing edge 122 are limited. Typically, it can only be folded once on one side, and it is difficult to fold the overlapping part a second time. Therefore, the first bend 123 is difficult to completely eliminate by means of inward folding. The inward folding of the side sealing angle 1222 can ensure the stability of the structure and minimize the size. In another embodiment, α=90°, and the side sealing angle 1222 is set adjacent to the second side 1213 after folding. In another embodiment, the side sealing angle 1222 can be folded inward toward the inner side of the side sealing end 1221 near the side 112.

[0050] The angle α is mainly determined by the direction of force applied during folding and the size of the folding area. If the angle α is too small, the folding effect of the side sealing angle 1222 will be poor. When α = 60°, the length of the thickness direction T at the upper end of the side sealing end 1221 is relatively large, meaning the overall folding area of ​​the side sealing angle 1222 is relatively small. When α = 90°, the length of the thickness direction T at the upper end of the side sealing end 1221 is basically zero, meaning the overall folding area of ​​the side sealing angle 1222 is large. (Refer to...) Figure 1Before folding, the side seal end 1221 is approximately square in shape. At this time, the side seal fold angle 1222 is equivalent to a triangle formed by folding along the diagonal of this square. Therefore, the length T of the upper end of the side seal end 1221 in the thickness direction is essentially zero. However, when α is greater than 90°, for example, α = 120°, folding the side seal fold angle 1222 will also cause a portion of the second side 1213 to fold, thus making the first side 1223 as close as possible to the top surface 111. This can be understood as follows: when α is greater than 90°, the folding... During the process, a portion of the area on one side of the second side 1213 connected to the side sealing end 1221 will move further towards the top surface, thereby further reducing the height of the first bent portion 123 extending out of the top surface 111. This allows for more effective control of 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 during folding, due to the hardness limitation of the material itself, α cannot be equal to 180° when the side sealing angle 1222 is folded; it can only be as close to 180° as possible.

[0051] 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 junction 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 junction of the side surface 112 and the rear end surface.

[0052] In one embodiment of this utility model, the protective component 100 can be made of a variety of materials, including stainless steel, aluminum alloy, heat shrink film, insulating film, and aluminum-plastic composite film (usually referred to as aluminum-plastic film) formed of aluminum material.

[0053] Taking aluminum-plastic film as a protective component 100 as an example, this material has been widely used in the field of battery protection due to its unique structure and performance. The aluminum-plastic film mainly consists of a multi-layer structure, including a nylon layer, an aluminum foil layer, a heat-sealing layer, and adhesives used to bond these layers. Each layer plays a specific role, working together to provide comprehensive protection for the battery.

[0054] The innermost layer of the aluminum-plastic film is the heat-sealing layer. Its main function is sealing and bonding, ensuring the battery's airtightness during the encapsulation process. The heat-sealing layer has excellent electrolyte resistance, preventing electrolyte corrosion of the battery's internal structure. Simultaneously, it possesses superior insulation and puncture resistance, ensuring that the battery will not experience internal short circuits and safety incidents when subjected to external impacts.

[0055] The middle layer is an aluminum foil layer. This layer is made of pure aluminum or an aluminum-iron alloy, which reacts with oxygen in the air at room temperature to form a dense oxide film. This oxide film effectively prevents oxygen and moisture from penetrating the battery, thus protecting the battery from external environmental corrosion. Furthermore, the aluminum foil layer has good electrical conductivity, facilitating the transmission of current within the battery.

[0056] The outermost layer is a nylon layer. Known for its excellent impact and puncture resistance, the nylon layer protects the aluminum foil layer from scratches and abrasions. During battery use, the nylon layer effectively reduces the impact and vibration caused by drops, collisions, and other unexpected events, thus ensuring the battery's stability and safety.

[0057] like Figure 3 As shown, an injection-molded battery packaging structure is disclosed, wherein the tab 130 extends from the top sealing edge 121 to the outside of the protective member 100 and is connected to the protective plate assembly 140; the protective 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 disposed on the side of the sealing edge where the bent portion 125 is located away from the packaging body 110 and is disposed opposite to the sealing edge; a portion of the substrate 141 is covered with an injection-molded structural member 150.

[0058] The portion of the substrate 141 not covered by the injection molding structure 150 forms an exposed portion 1411; the exposed portion 1411 includes at least one exposed surface 1412; at least one exposed surface 1412 is located on at least one of two opposite outer surfaces of the substrate 141 along the thickness direction of the cell 10, the outer surface being a front surface 1418 and / or a rear surface 1419, the front surface 1418 and / or the rear surface 1419 can be a complete plane, or have uneven surfaces with protrusions or depressions, for example... Figure 3 In the figure, the uneven front side 1418 is formed by the position indicated by reference numeral 1418 and the protrusion indicated by reference numeral 1411.

[0059] The substrate 141 includes a lower end face 1415 disposed relative to the end face of the packaging body 110, an upper end face 1414 disposed opposite to the packaging body 110 and relative to the lower end face 1415, a front side face 1418 and a rear side face 1419 disposed opposite to each other along a third direction, and a left end face 1416 and a right end face 1417 disposed opposite to each other along a first direction; the exposed portion 1411 of the substrate may be a part of the substrate 141 or a structure protruding relative to the substrate 141; such as Figure 4As shown, the exposed portion 1411 of the substrate is a raised structure in the middle of the substrate 141, and there is a size difference D between the raised structure and the substrate 141 body. This gap can be used to form the glue flow channel during injection molding, and after the glue solidifies, it covers the substrate 141 body to fix the substrate 141. It can be understood that by setting the exposed portion 1411 of the substrate, the size of the substrate 141 in the T direction can be comparable to that of the cell 10 in the T direction, thereby achieving the maximum usable area. On this basis, an effective low-pressure injection molding packaging structure can also be achieved. In the prior art, the size of such circuit board in the thickness direction (T direction) of the cell 10 needs to be smaller than the thickness of the cell 10 to facilitate the formation of a complete wrapping effect in the circumference of the circuit board, which will significantly reduce the usable area of ​​the circuit board.

[0060] like Figure 5 The diagram shown is a schematic representation of the internal structure of this invention in the thickness direction. Figure 6 yes Figure 5 Cross-sectional views of multiple embodiments at the BB position; such as Figure 6 As shown in Figure a, the exposed portion 1411 of the substrate is provided in the positive direction of the T direction, mainly forming an exposed surface 1412; as Figure 6 As shown in b, the exposed portion 1411 of the substrate is provided in the negative direction of the T direction, mainly forming an exposed surface 1412; as Figure 6 As shown in Figure c, the exposed substrate portion 1411 is provided in both the positive and negative directions of the T direction, forming two exposed substrate portions 1411 and two exposed substrate surfaces 1412; as Figure 6 As shown in d, the substrate exposed portion 1411 is provided in both the positive and negative directions of the T direction, forming four substrate exposed portions 1411 and four substrate exposed surfaces 1412.

[0061] In one embodiment, an insulating gasket 160 is provided between the substrate 141 and the sealing edge 120 where the bent portion 125 is located; the injection-molded structural component 150 is provided with a gasket 170 that at least partially covers the exposed surface 1412. The gasket 170 can be made of a multi-material composite, with the inner surface in contact with the exposed surface 1412 made of an insulating material (e.g., PI) and the outer surface made of a heat-dissipating material (e.g., graphite), which can improve the heat dissipation effect of injection molding.

[0062] In one embodiment, the flexible circuit board 142 and the substrate 141 are electrically connected to the end face of the package body 110.

[0063] In one embodiment, the injection-molded structural component 150 covers the bent portion 125, the tab 130, and partially covers the substrate 141; the injection-molded structural component 150 includes a limiting portion 151 that covers at least the middle portion of the upper end face 1414 of the substrate 141; the limiting portion 151 has a maximum distance between itself and the encapsulation body 110 at the middle portion of the substrate 141, so as to form a receiving portion 152 with a relatively small distance from the encapsulation body 110 at the end of the upper end face 1414 of the substrate 141; the flexible circuit board 142 is at least partially disposed in the receiving portion 152. The limiting part 151 can effectively maintain the stability of the connection between the substrate 141 and the cell 10. Since the substrate 141 is also provided with electronic devices 1413, the upper end surface 1414 and / or the lower end surface 1415 of the substrate 141 are not relatively flat, and the height (dimensional in the L direction) of the electronic devices 1413 is not the same. Therefore, there will be a height difference. By concentrating the electronic devices 1413 with higher height (dimensional in the L direction) in the middle of the substrate 141, the limiting part 151 not only effectively protects the electronic devices 1413, but also forms a receiving part 152 higher than other positions. The receiving part 152 can accommodate the dimension in the height direction of the flexible circuit board 142, thereby reducing the overall size occupied by the battery in the length direction L.

[0064] In one embodiment, the injection-molded structural component 150 covers the bent portion 125 to form a corner seal portion 153; the injection-molded structural component includes a recessed portion 154 located between the corner seal portion 153 and the receiving portion 152; the distance between the recessed portion 154 and the encapsulation body 110 is less than the distance between the receiving portion 152 and the encapsulation body 110. The recessed portion 154 typically does not contain a substrate 141, thereby allowing for a lower height.

[0065] In one embodiment, the flexible circuit board 142 includes a first segment 1421, a bent segment 1422, and a second segment 1423 connected in sequence; the first segment 1421 is at least partially located in the receiving portion 152; the first segment 1421 is provided with a connector 1424 for electrical connection with external electrical equipment; the first segment 1421 and the second segment 1423 are arranged opposite to each other along a second direction; the bent segment 1422 is at least partially located in the recess 154.

[0066] like Figure 7 As shown, the bent segment 1422 can be completely located within the recess 154, and the bent segment 1422 connects the first segment 1421 and the second segment 1423 through an arc segment; as Figure 8As shown, the bending section 1422 may include a second bending section 1425 to form a stepped bend and increase local clearance space; a buffer section 1426 may also be provided in the bending section 1422 to prevent the bending section 1422 from bending excessively and to protect the bending section 1422; the buffer section 1426 may be a cushioning material such as foam or silicone; the length of the first section 1421 may be set to be longer to improve the current carrying capacity and heat dissipation capacity.

[0067] like Figure 9 As shown, a schematic diagram of multiple injection-molded battery packaging structures of this utility model is illustrated; as... Figure 9 As described in section a, the end face of the substrate 141 relative to the packaging body 110 is the lower end face 1415, and the end face away from the packaging body 110 and relative to the lower end face 1415 is the upper end face 1414. Electronic devices 1413 are distributed on both the upper end face 1414 and the lower end face 1415 of the substrate 141. In one embodiment, they may be disposed on only one of the upper end face 1414 and the lower end face 1415. The height of the electronic devices 1413 located at both ends of the upper end face 1414 is less than the height of the electronic devices 1413 located in the middle of the upper end face 1414. Specifically, the size of the electronic device 1413 disposed on the upper end surface 1414 at both ends of the substrate 141 in the W direction is smaller in the L direction than the size of the electronic device 1413 in the middle of the upper end surface 1414 of the substrate 141 in the L direction, so that the accommodating portion 152 can be formed better; the size of the electronic device 1413 disposed on the upper end surface 1414 at both ends of the substrate 141 in the W direction is preferably less than or equal to 0.2 mm.

[0068] In one embodiment, such as Figure 9 b、 Figure 9 As shown in Figure c, the limiting part 151 is provided with a hollowed-out part 155 along the thickness direction of the battery cell 10. The shape of the hollowed-out part 155 can be wavy, square, or triangular, trapezoidal, or other common geometric shapes. This can reduce the amount of adhesive material and improve the heat dissipation capacity of the protective board; and since the usable area of ​​the substrate 141 of this utility model is larger, the layout of electronic devices 1413 on the substrate 141 can be more dispersed and easier to form. Figure 9 b、 Figure 9 In the concave-convex injection molding structure in c, the concave part can be set at the location without electronic components 1413, and the convex part covers the electronic components 1413, thereby reducing the space occupied by the overall limiting part 151.

[0069] In one embodiment, such as Figure 9 As shown in d, the limiting part 151 is arc-shaped, and the two ends of the limiting part 151 form planar parts 1511 covering the two ends of the substrate 141;

[0070] In one embodiment, such as Figure 9As shown in e, the limiting part 151 is arc-shaped, and the top of the substrate 141 at both ends of the limiting part 151 forms an exposed surface 1412. The first segment 1421 of the flexible circuit board 142 cooperates with the exposed surface 1412, and the size of the cell 10 in the L direction can be smaller.

[0071] In one embodiment, such as Figure 9 As shown in f, the limiting part 151 is arc-shaped, and the top of the substrate 141 at both ends of the limiting part 151 forms an exposed surface 1412. At the same time, the left end surface 1416 and the right end surface 1417 of the substrate 141 also form exposed surfaces 1412.

[0072] In one embodiment, such as Figure 9 As shown in g, the limiting portion 151 is arc-shaped and completely covers the top of the upper end face 1414. The exposed surface 1412 can be provided on the front side face 1418 and / or the rear side face 1419. The middle part of the limiting portion 151 has the maximum distance from the encapsulation body 110, so that a receiving portion 152 with a relatively small distance from the encapsulation body 110 is formed at the end of the upper end face 1414 of the substrate 141. Since the limiting portion 151 also covers the end of the upper end face 1414, the receiving portion 152 is located above the end of the limiting portion 151. This structure can achieve full coverage of the upper end face 1414, and at the same time, this structure The structure can also effectively reduce the average height of the protrusion of the limiting part 151. For example, the electronic devices 1413 also have different heights. When the electronic devices 1413 are arranged on the upper end surface 1414 in a way that the middle is higher and the sides gradually decrease, the arc-shaped limiting part 151 can effectively achieve a uniform thickness when the electronic devices 1413 are covered, which helps to reduce the use of injection molding material. The average height of the protrusion of the limiting part 151 is also lower. Compared with the prior art, which uses the height of the highest electronic device 1413 as a reference to inject a plane, it saves more material. The arc shape also makes it easier to demold after injection molding.

[0073] like Figure 10 As shown, the minimum thickness of the injection-molded structural component 150 covering the electronic device 1413 is 0.3mm to 1.5mm. The minimum thickness can be... Figure 10 In the H1 or H2 of this structure, during injection molding, because it includes the hollow portion 155, the minimum thickness may be the size of H1, but usually the minimum thickness is the size of H2; the minimum thickness of the empty area of ​​the upper end surface 1414 of the substrate 141 where no electronic device 1413 is provided is 0.3mm~1.5mm, such as Figure 10 H3 in the text.

[0074] like Figure 11 As shown, the battery cells 10 are stacked or arranged side by side.

[0075] In one embodiment, the injection-molded structural component 150 covers the first bent portion 123, the tab 130, and at least partially encapsulates the substrate 141 through injection molding. The top of the corner seal 153 can be set as a plane, thereby effectively eliminating the sharp end of the first bent portion 123. The injection-molded structural component 150 does not directly increase the length L of the encapsulation structure; it merely provides a full wrapping coverage of the first bent portion 123, which further increases safety and prevents the first bent portion 123 from rebounding after bending. Furthermore, during pressure injection molding, the injection pressure can also compress the first bent portion 123, which can further reduce the protrusion height of the first bent portion 123.

[0076] The limiting part 151 plays a structural limiting and fixing role for the substrate 141, ensuring that the substrate 141 can remain in a predetermined position even when subjected to external forces such as vibration and compression during battery use, preventing displacement that could lead to loosening of the connection 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 normal battery operation.

[0077] The injection-molded structural component 150 covers the first bend 123, the second bend 124, the top surface 111, the top sealing edge 121, the tab 130, and part of the substrate 141. This effectively isolates these components from external contact, preventing short circuits caused by foreign objects or corrosion of internal components by moisture, reducing the risk of electrical failures and ensuring battery safety. The comprehensive coverage of critical battery components by the injection-molded structural component not only provides insulation but also cushions external impacts, protecting fragile internal electrode components, tabs, and circuit boards, reducing damage from collisions and friction, extending battery life, and lowering operating costs.

[0078] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A battery packaging structure, comprising a cell (10); the cell (10) comprising an electrode assembly and a protective component (100) encapsulating the electrode assembly; the protective component (100) comprising a packaging body (110) encapsulating the electrode assembly and a sealing edge (120) extending outward from the packaging body (110), characterized in that: The sealing edge (120) is folded toward the encapsulation body (110) and forms a bend (125) at at least one corner of the encapsulation body (110); an electrode tab (130) is connected to the electrode assembly; the electrode tab (130) extends from the sealing edge (120) to the outside of the protective member (100) and is connected to the protective plate assembly (140); the protective 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 disposed at the bend (125). 5) The sealing edge (120) is located on the side away from the encapsulation body (110) and is disposed opposite to the sealing edge (120); a portion of the substrate (141) is covered with an injection molding structure (150); the portion of the substrate (141) not covered by the injection molding structure (150) forms an exposed portion (1411); the exposed portion (1411) includes at least one exposed surface (1412); at least one exposed surface (1412) is located on at least one of the two outer surfaces of the substrate (141) disposed opposite to each other along the thickness direction of the cell (10).

2. The injection-molded battery packaging structure according to claim 1, characterized in that: An insulating pad (160) is provided between the substrate (141) and the sealing edge (120) where the bent portion (125) is located; a pad (170) that at least partially covers the exposed surface (1412) is provided outside the injection molded structural component (150).

3. The injection-molded battery packaging structure according to claim 1, characterized in that: The flexible circuit board (142) and the substrate (141) are electrically connected to the end face of the packaging body (110) relative to the substrate (141).

4. The injection-molded battery packaging structure according to claim 1, characterized in that: The injection-molded structural component (150) covers the bent portion (125), the tab (130), and partially covers the substrate (141); the injection-molded structural component (150) includes a limiting portion (151) covering at least the middle of the upper end face (1414) of the substrate (141); the limiting portion (151) has a maximum distance between itself and the encapsulation body (110) at the middle of the substrate (141) to form a receiving portion (152) with a relatively small distance from the encapsulation body (110) at the end of the upper end face (1414) of the substrate (141); the flexible circuit board (142) is at least partially disposed in the receiving portion (152).

5. The injection-molded battery packaging structure according to claim 4, characterized in that: The injection-molded structural component (150) covers the bent portion (125) to form a corner seal portion (153); the injection-molded structural component (150) includes a recess portion (154) located between the corner seal portion (153) and the receiving portion (152); the distance between the recess portion (154) and the encapsulation body (110) is less than the distance between the receiving portion (152) and the encapsulation body (110).

6. The injection-molded battery packaging structure according to claim 4, characterized in that: The flexible circuit board (142) includes a first segment (1421), a bent segment (1422), and a second segment (1423) connected in sequence; the first segment (1421) is at least partially located in the receiving portion (152); the first segment (1421) is provided with a connector (1424) for electrical connection with external electrical equipment; the first segment (1421) and the second segment (1423) are arranged opposite to each other along a second direction; the bent segment (1422) is at least partially located in the recess (154).

7. The injection-molded battery packaging structure according to claim 4, characterized in that: The limiting part (151) is provided with a hollow part (155) that is hollowed out along the thickness direction of the battery cell (10).

8. The injection-molded battery packaging structure according to claim 1, characterized in that: The end face of the substrate (141) relative to the packaging body (110) is the lower end face (1415), and the end face away from the packaging body (110) and relative to the lower end face (1415) is the upper end face (1414). Electronic devices (1413) are distributed on both the upper end face (1414) and the lower end face (1415) of the substrate (141). The height of the electronic devices (1413) located at both ends of the upper end face (1414) is less than the height of the electronic devices (1413) located in the middle of the upper end face (1414).

9. The injection-molded battery packaging structure according to claim 8, characterized in that: The minimum thickness of the injection-molded structural component (150) covering the electronic device (1413) is 0.3mm to 1.5mm, and the minimum thickness of the empty area of ​​the upper end surface (1414) of the substrate (141) where the electronic device (1413) is not provided is 0.3mm to 1.5mm.

10. A battery packaging structure according to any one of claims 1-9, characterized in that: This includes multiple cells (10) stacked or arranged side by side.

Images