Battery

Abstract

The utility model relates to a battery. The battery comprises a battery cell, the battery cell comprises an electrode assembly and a protection piece packaged outside the 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; the electrode assembly is connected with a tab; the tab extends out of the protection piece from the sealing edge and is connected with the protection plate assembly; the protection plate assembly comprises a substrate and a flexible circuit board. The flexible circuit board is connected with the substrate; the substrate is arranged on one side, far away from the packaging main body, of the sealing edge where the bending part is located and is opposite to the sealing edge; and a part of the substrate is coated with an injection molding plastic structural member. According to the utility model, the injection molding structural member partially wrapping the substrate is convenient for stopping glue of the injection mold, and the exposed surface can be used for stopping glue, so that the development cost of the mold is reduced, and the maintenance cost of the mold is reduced; meanwhile, the exposed surface can also be used for reducing space occupation in a specific direction and reducing the size of the battery.

Description

Technical Field

[0001] This utility model relates to the field of battery cell packaging, and more particularly to a battery. 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 but also as a connection point between the battery body and external electrical connectors (such as the battery protection board, Protection Circuit Module, or 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.

[0006] In existing technologies, the PCB and FPC are integrally molded and cannot be disassembled. If the FPC is damaged, the PCM (PCB+FPC) / finished battery must be scrapped, resulting in high scrapping costs. Injection molding sealing methods are relatively cumbersome, requiring the design of sealing solutions specifically for the FPC. There are many process limitations; during production, fixtures and equipment must be adapted according to the FPC size and bending angle, and the automation rate for special angles, shapes, and sizes is low. Automating stations such as dual connector output testing is also quite difficult. Utility Model Content

[0007] To address the aforementioned problems in the prior art, this utility model provides a battery.

[0008] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0009] A battery includes a cell; the cell includes an electrode assembly and a protective component encapsulating the electrode assembly; the protective component includes an encapsulation body covering the electrode assembly and a sealing edge extending outward from the encapsulation body; the sealing edge is folded toward the encapsulation body and forms a bent portion at at least one corner of the encapsulation 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 encapsulation body and is disposed opposite to the sealing edge; a portion of the substrate is covered with an injection-molded structural component.

[0010] In one embodiment of the present invention, the portion of the substrate not covered by the injection molding structure forms an exposed portion of the substrate; the exposed portion of the substrate includes at least one exposed surface; 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; a first connector is provided at the upper end face or the lower end face of the exposed portion of the substrate; a second connector connected to the first connector is provided on the flexible circuit board.

[0011] In one embodiment of the present invention, the exposed portion of the substrate is located at both ends of the substrate along a first direction; the end face of the exposed portion of the substrate facing away from the packaging body is the exposed surface; the first connector is disposed on the exposed surface.

[0012] 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 partially covers the upper end face of the substrate; the distance between the exposed surface and the encapsulation body is less than the distance between the limiting portion and the encapsulation body, so as to form an accommodating portion between the exposed surface and the limiting portion; the flexible circuit board is at least partially disposed in the accommodating portion.

[0013] In one embodiment of the present invention, 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.

[0014] 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 on the top of the limiting portion; the second segment is located in the receiving portion; and a second connector is provided on the second segment.

[0015] 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 second segment is at least partially located in the receiving portion; a second connector is provided on the second segment; the first segment and the second segment are arranged opposite to each other along a second direction; the bent segment is at least partially bent toward the interior of the recess so as to be at least partially located within the recess.

[0016] In one embodiment of this utility model, the first segment is provided with a third connector for electrical connection with external electrical equipment.

[0017] In one embodiment of the present invention, the end of the substrate along the first direction has a distance H1 between it and the nearest adjacent bent portion.

[0018] In one embodiment of the present invention, the substrate coincides with the projected portion of the bent portion in the second direction.

[0019] The beneficial effects of this invention are as follows: the injection-molded structure that partially encapsulates the substrate facilitates glue removal in the injection mold, and the exposed surface can be used for glue removal, reducing mold development and maintenance costs; simultaneously, the exposed surface can also reduce space occupation in a specific direction, achieving the goal of reducing battery size. The specially structured injection-molded structure helps optimize dimensions in the L direction; the soldering method between the PCB and FPC is changed from soldering to connector connection, allowing FPC connection and fastening after PACK assembly. This increases the versatility of electrical equipment and reduces development and certification costs. Attached Figure Description

[0020] 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.

[0021] Figure 1This is a schematic diagram of the battery cell structure of this utility model;

[0022] Figure 2 This is an enlarged view of part A of the structure of this utility model;

[0023] Figure 3 This is a front view of the battery of this utility model;

[0024] Figure 4 This is a schematic diagram of the battery explosion of this utility model;

[0025] Figure 5 This is a schematic diagram of the injection-molded structural component and the substrate of this utility model;

[0026] Figure 6 This is a schematic diagram of the flexible circuit board structure of this utility model;

[0027] Figure 7 This is another structural schematic diagram of the flexible circuit board of this utility model;

[0028] Explanation of reference numerals in the attached figures:

[0029] 10. Battery cell; 100. Protective component; 110. Encapsulation 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 end sealing; 1213. Second side; 122. Side edge sealing; 1221. Side end sealing; 1222. Side angle sealing; 1223. First side; 123. First bend; 124. Second bend; 125. Bending portion; 130. Electrode tab; 140. Protective board assembly; 141. Substrate; 1411. Substrate Exposed portion; 1412, First connector; 1413, Electronic component; 1414, Exposed surface; 1415, Upper end face; 1416, Lower end face; 1417, Left end face; 1417', Right end face; 1418, Front side face; 1418', Rear side face; 142, Flexible circuit board; 1421, Second connector; 1422, Third connector; 1423, First segment; 1424, Bending segment; 1425, Second segment; 150, Injection molded structural component; 151, Limiting portion; 152, Receiving portion; 153, Corner sealing portion; 154, Recessed portion. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] A battery includes a cell 10; the cell 10 includes an electrode assembly (not shown) and a protective component 100 encapsulating the electrode assembly; the protective component 100 includes an encapsulation body 110 that encapsulates the electrode assembly and a sealing edge 120 extending outward from the encapsulation body 100; the encapsulation 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.

[0035] 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.

[0036] 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 package body 110 is a flat, rounded cuboid. The package 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 at the front side along the thickness direction T, and a rear surface (not shown in the figure) located at the rear side along the thickness direction T. In some embodiments, the package body 110 may also be a flat cuboid without rounded corners or with partially rounded corners. 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.

[0037] 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.

[0038] 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 100; 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.

[0039] 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 single-layer folding springback and other factors 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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;

[0046] 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.

[0047] 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 larger, meaning the overall folding area of ​​the side sealing angle 1222 is smaller. 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 larger. (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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] like Figure 3-4 As shown, a battery has an electrode tab 130 extending from the top sealing edge 121 to the outside of the protective member 100 and connected to a 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 located on the side of the sealing edge where the bent portion 125 is located away from the encapsulation 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.

[0055] like Figure 4 As shown, in one embodiment, 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 1414; the substrate 141 includes a lower end surface 1416 disposed relative to the end face of the encapsulation body 110, an upper end surface 1415 disposed opposite to the encapsulation body 110 and opposite to the lower end surface 1416, a front side surface 1418 and a rear side surface 1418' disposed opposite each other along a third direction, and a left end surface 1417 and a right end surface 1418' disposed opposite each other along a first direction. 417'; The exposed surface 1414 may be formed by at least a portion of at least one of the upper end surface 1415, lower end surface 1416, front side surface 1418, rear side surface 1418', left end surface 1417, and right end surface 1417'; The injection molding structure 150 that partially wraps the substrate 141 can facilitate the injection mold to stop the glue, and the exposed surface 1414 can be used to stop the glue, thereby reducing the mold development cost and the mold maintenance cost; At the same time, the exposed surface 1414 can also be used to reduce the space occupied in a certain direction, thereby achieving the purpose of reducing the battery size.

[0056] The exposed portion 1411 of the substrate is provided with a first connector 1412 at its upper end face 1415 or lower end face 1416; the flexible circuit board 142 is provided with a second connector 1421 connected to the first connector 1412. The first connector 1412 and the second connector 1421 constitute a male-female connector commonly used in the art, which can achieve rapid installation by plugging in; for example Figure 4 In this embodiment, the first connector 1412 is disposed at the upper end face 1415 of the exposed portion 1411 of the substrate; in another embodiment, the first connector 1412 may be disposed at the lower end face 1416 of the exposed portion 1411 of the substrate. Using connectors for connection can effectively increase the versatility between devices and save costs.

[0057] In one embodiment, the exposed portion 1411 of the substrate is located at both ends of the substrate 141 along a first direction; the end face of the exposed portion 1411 facing away from the encapsulation body 110 is the exposed surface 1414; the first connector 1412 is disposed on the exposed surface 1414; as Figure 5 As shown, the position of the exposed surface 1414 at this time is such that there is no injection molding structure 150 on the top of the exposed surface 1414, thereby reducing the size of the exposed surface 1414 in the length direction L; the exposed surface 1414 at this time can act as a stop surface during injection molding, and the flexible circuit board 142 is electrically connected to the first connector 1412 through the second connector 1421. That is, during injection molding, the top of the substrate 141 is a relatively flat structure, and there is no obstruction from the flexible circuit board 142, which greatly reduces the difficulty of injection molding.

[0058] In one embodiment, the first connector 1412 can be soldered after the injection-molded structure 150 is formed, and finally the second connector 1421 of the flexible circuit board 142 is fastened to the first connector 1412; in another embodiment, the first connector 1412 can be soldered onto the exposed surface 1414 first, and then the injection-molded structure 150 can be formed, and finally the second connector 1421 of the flexible circuit board 142 is fastened to the first connector 1412.

[0059] 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 partially covers the upper end face 1415 of the substrate 141; the distance between the exposed surface 1414 and the encapsulation body 110 is less than the distance between the limiting portion 151 and the encapsulation body 110, so as to form a receiving portion 152 between the exposed surface 1414 and the limiting portion 151; 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 1415 and / or the lower end surface 1416 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 exceeds the exposed part 1411 of the substrate to form a receiving part 152. The receiving part 152 can accommodate the dimension in the height direction of the flexible circuit board 142, or accommodate the dimension in the height direction of the first connector 1412, or the dimension in the height direction of the first connector 1412 and the second connector 1421, or the dimension in the height direction of the first connector 1412, the second connector 1421 and part of the flexible circuit board 142, thereby reducing the overall size occupied by the battery in the length direction L.

[0060] 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 150 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. For example... Figure 6 As shown, the recessed portion 154 typically does not contain the substrate 141, thereby enabling it to have a lower height. The end of the substrate 141 along the first direction has a distance H1 between it and the nearest adjacent bend 125. The recessed portion 154 is at least partially located in the region where the distance H1 is located.

[0061] like Figure 6As shown, for ease of display, part of the battery cell structure is omitted below the dotted line; in one embodiment, the flexible circuit board 142 includes a first segment 1423, a bent segment 1424, and a second segment 1425 connected in sequence; the second segment 1425 is at least partially located in the receiving portion 152; a second connector 1421 is provided on the second segment 1425; the first segment 1423 and the second segment 1425 are arranged opposite to each other along a second direction; the bent segment 1424 is at least partially bent toward the interior of the recess 154 so that it is at least partially located within the recess 154, thereby reducing the space occupied in the L direction; a third connector 1422 for electrical connection with external electrical equipment is provided on the first segment 1423;

[0062] Figure 6 The structure of various flexible circuit boards 142 is shown in the figure;

[0063] Figure 6 a includes two flexible circuit boards 142, which are respectively disposed at both ends of the substrate 141 along the W direction. The first segment 1423 and the second segment 1425 are both partially located in the receiving portion 152 but do not extend to the limiting portion 151. The third connector 1422 is located above the receiving portion 152, so that the size of the partial receiving portion in the L direction can be utilized.

[0064] Figure 6 b includes two flexible circuit boards 142, which are respectively disposed at both ends of the substrate 141 along the W direction. The first segment 1423 and the second segment 1425 are both partially located in the receiving portion 152. The first segment 1423 extends to the limiting portion 151 at the same time. The third connector 1422 is located above the limiting portion 151.

[0065] Figure 6 c includes a flexible circuit board 142, a second segment 1425 located in the accommodating portion 152, a first segment 1423 located above the accommodating portion 152 and the limiting portion 151, and a third connector 1422 located above the accommodating portion 152 with two connectors spaced apart.

[0066] Figure 6 d includes a flexible circuit board 142, a second segment 1425 located in the accommodating portion 152, a first segment 1423 located above the accommodating portion 152 and the limiting portion 151, and a third connector 1422 located above the limiting portion 151 with two connectors spaced apart.

[0067] Figure 6 e includes a flexible circuit board 142, a second segment 1425 located in the receiving portion 152, a first segment 1423 located above the receiving portion 152 and the limiting portion 151, and a third connector 1422 located above the limiting portion 151 and provided therein;

[0068] like Figure 7As shown, for ease of display, part of the battery cell structure is omitted below the dotted line; in one embodiment, the flexible circuit board 142 includes a first segment 1423, a bent segment 1424, and a second segment 1425 connected in sequence; the first segment 1423 is at least partially located on the top of the limiting portion 151; the second segment 1425 is located in the receiving portion 152; a second connector 1421 is provided on the second segment 1425; and a third connector 1422 for electrical connection with external electrical equipment is provided on the first segment 1423.

[0069] Figure 7 The structure of various flexible circuit boards 142 is shown in the figure;

[0070] Figure 7 a includes two flexible circuit boards 142, which are respectively disposed at both ends of the substrate 141 along the W direction. The first segment 1423 is located at the top of the limiting part 151, the second segment 1425 is located in the receiving part 152, and the third connector 1422 is located above the limiting part 151.

[0071] Figure 7 b includes two flexible circuit boards 142, which are respectively disposed at both ends of the substrate 141 along the W direction. The first segment 1423 is located at the top of the limiting part 151, the second segment 1425 is located at the receiving part 152, and the third connector 1422 is located above the limiting part 151. Compared with 7a, the distance between the third connectors 1422 in 7b is smaller.

[0072] Figure 7 c includes a flexible circuit board 142, a second segment 1425 located in the receiving portion 152, a first segment 1423 located above the limiting portion 151, and a third connector 1422 located above the limiting portion 151 and provided there is one;

[0073] Figure 7 d includes a flexible circuit board 142, a second segment 1425 located in the receiving portion 152, a first segment 1423 located above the limiting portion 151, and a third connector 1422 located above the limiting portion 151 and two connectors are provided.

[0074] like Figure 7 As shown, in one embodiment, the substrate 141 coincides with the projected portion of the bent portion 125 in the second direction. The overlapping distance is as follows: Figure 7 In H2 of this structure, the length of the substrate 141 is set to be longer, so that there is no recess 154.

[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, characterized by: The battery cell (10) includes an electrode assembly and a protective enclosure (100) encapsulating the electrode assembly. The protective enclosure (100) includes an encapsulation body (110) encapsulating the electrode assembly and a sealing edge (120) extending outward from the encapsulation body (110). 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). A tab (130) is connected to the electrode assembly. The tab (130) extends from the sealing edge. The edge (120) extends out 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 located on the side of the sealing edge (120) where the bent portion (125) is located away from the encapsulation body (110) and is opposite to the sealing edge (120); a portion of the substrate (141) is covered with an injection-molded structural member (150).

2. The battery of claim 1, wherein: The substrate (141) is not covered by the injection molding structure (150) to form an exposed portion (1411); the exposed portion (1411) includes at least one exposed surface (1414); the end face of the substrate (141) relative to the encapsulation body (110) is a lower end face (1416), and the end face away from the encapsulation body (110) and relative to the lower end face (1416) is an upper end face (1415); the exposed portion (1411) is provided with a first connector (1412) at the upper end face (1415) or the lower end face (1416); the flexible circuit board (142) is provided with a second connector (1421) connected to the first connector (1412).

3. A battery according to claim 2, wherein: The exposed portion (1411) of the substrate is located at both ends of the substrate (141) along the first direction; the end face of the exposed portion (1411) away from the encapsulation body (110) is the exposed surface (1414); the first connector (1412) is disposed on the exposed surface (1414).

4. A battery according to claim 3, wherein: 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 partially covers the upper end face (1415) of the substrate (141); the distance between the exposed surface (1414) and the encapsulation body (110) is less than the distance between the limiting portion (151) and the encapsulation body (110), so as to form a receiving portion (152) between the exposed surface (1414) and the limiting portion (151); the flexible circuit board (142) is at least partially disposed in the receiving portion (152).

5. A battery according to claim 4, wherein: 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 battery of claim 4, wherein: The flexible circuit board (142) includes a first segment (1423), a bent segment (1424) and a second segment (1425) connected in sequence; the first segment (1423) is at least partially located on the top of the limiting portion (151); the second segment (1425) is located in the receiving portion (152); and a second connector (1421) is provided on the second segment (1425).

7. The battery of claim 5, wherein: The flexible circuit board (142) includes a first segment (1423), a bent segment (1424), and a second segment (1425) connected in sequence; the second segment (1425) is at least partially located in the receiving portion (152); a second connector (1421) is provided on the second segment (1425); the first segment (1423) and the second segment (1425) are arranged opposite to each other along a second direction; the bent segment (1424) is at least partially bent toward the interior of the recess (154) so ​​that it is at least partially located in the recess (154).

8. A battery according to claim 6 or 7, characterised in that: The first segment (1423) is provided with a third connector (1422) for electrical connection with external electrical equipment.

9. The battery of claim 1, wherein: The substrate (141) has a spacing H1 between its end along the first direction and the nearest adjacent bend (125).

10. The battery of claim 1, wherein: The substrate (141) and the projected portion of the bent portion (125) in the second direction coincide.

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