Secondary battery cover plate and battery assembly
By setting reinforcing ribs and a multi-layered support structure with plastic coating around the terminal holes of the secondary battery cover, the problem of unstable connection between the terminal and the cover body is solved, the structural stability and sealing of the battery are improved, and the service life is extended.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BATTEROTECH CO LTD
- Filing Date
- 2025-04-14
- Publication Date
- 2026-06-02
Smart Images
Figure CN224318546U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of secondary batteries, and more particularly to a secondary battery cover and battery assembly. Background Technology
[0002] In lithium-ion battery modules, the cover plate, as a key structural component, typically includes the cover plate body, positive and negative terminals, and other auxiliary components. As the core component for battery current transmission, the terminals not only need to meet conductivity requirements but also possess high structural strength and sealing performance to ensure the safety and reliability of the battery during long-term use.
[0003] In the current structure of secondary battery covers, the bonding strength between the plastic insulation component and the cover body is insufficient, and the terminals are prone to displacement or deformation, which may lead to electrolyte leakage. In addition, the plastic insulation component is also prone to loosening, which will affect the battery's service life.
[0004] Therefore, there is an urgent need to provide a secondary battery cover or battery assembly that can improve the connection strength between the terminal and the cover body, and improve the assembly stability of the plastic insulation components, so as to improve the safety performance and durability of the battery. Utility Model Content
[0005] This application provides a secondary battery cover and battery assembly to solve the problem of unstable connection between the terminal post and the cover body, thereby improving the safety performance and durability of the battery.
[0006] In a first aspect, this application provides a secondary battery cover plate, comprising: a cover plate body having a terminal through hole; a terminal through hole; an upper plastic material injection molded on the upper surface of the cover plate body and covering the circumferential portion of the terminal through hole; and a reinforcing rib disposed on the outer periphery of the terminal through hole, the reinforcing rib including a first pushing portion protruding from the plane of the cover plate body and embedded between the inner and outer contours of the upper plastic material.
[0007] In the above design, reinforcing ribs are positioned around the periphery of the terminal through-hole, with their first abutting portion protruding from the plane of the cover body and embedded between the inner and outer contours of the upper plastic. This design effectively enhances the structural strength of the cover body around the terminal through-hole. During battery use, the terminal is subjected to various forces, such as internal battery pressure and external mechanical impact. The reinforcing ribs can disperse these forces, preventing deformation or breakage of the cover body at the terminal through-hole. For example, in some high-energy-density battery applications, the internal battery pressure may be relatively high; the reinforcing ribs can provide excellent support, ensuring the integrity of the cover. The upper plastic is injection molded onto the upper surface of the cover body and covers the circumferential portion of the terminal. Simultaneously, the reinforcing ribs are embedded between the inner and outer contours of the upper plastic, allowing the upper plastic and reinforcing ribs to work together. The upper plastic itself has a certain degree of elasticity, which can buffer external impacts. The reinforcing ribs provide rigid support; the combination of the two ensures that the entire cover has both sufficient elastic buffering capacity and good rigid support when subjected to external forces, further improving the structural stability of the cover. The reinforcing ribs, embedded between the inner and outer contours of the upper plastic, ensure a tighter wrapping of the upper plastic around the terminal hole. Acting like a "fixture," it prevents the upper plastic from loosening due to thermal expansion and contraction or mechanical vibration during use, thus ensuring long-term stability of the seal and preventing electrolyte leakage. Due to the special design of the reinforcing ribs and the upper plastic, the terminal is more stably fixed in the terminal hole during assembly. The covering effect of the upper plastic and the supporting effect of the reinforcing ribs prevent the terminal from deforming, loosening, or shifting after assembly. This is crucial for battery assembly quality, as the accuracy of the terminal position directly affects the battery's electrical connection performance. This integrated design of the reinforcing ribs and the upper plastic improves production efficiency. During the injection molding of the upper plastic, the presence of the reinforcing ribs serves as a positioning and supporting structure, making the injection process smoother.
[0008] In one possible design, the cross-section of the first pushing part is annular, wavy, or discontinuous.
[0009] Through the above design, the annular structure can evenly distribute force around the terminal hole. When the battery is subjected to external impact or internal pressure, the annular pushing part can evenly transfer the force to the cover body and the upper plastic, avoiding local stress concentration, thereby improving the overall strength and stability of the cover. The annular structure design is compact and can make full use of the limited space around the terminal hole, allowing the overall size of the cover to be designed to be smaller while maintaining sufficient structural strength.
[0010] The undulating structure significantly enhances the bending resistance of the cover plate around the terminal through-hole. When subjected to bending forces, the undulations act like a spring, dispersing stress and preventing deformation or breakage of the cover plate in the bending direction. Under repeated stress, the undulating structure better resists fatigue failure. For example, during battery charging and discharging, the terminals may experience slight displacement due to temperature changes; the undulating structure effectively absorbs the stress generated by these slight displacements, extending the lifespan of the cover plate.
[0011] Intermittent raised structures can provide localized reinforcement at critical locations. This design allows for targeted placement of raised sections in areas of high stress, based on the stress distribution around the vias, thereby increasing the strength of the cover plate at these critical locations. Intermittent raised structures are easier to implement during injection molding because they do not place as high demands on the injection mold as continuous annular or wavy structures. This helps reduce production costs while maintaining production efficiency.
[0012] In one possible design, the reinforcing rib also includes a second pushing part, which is fixedly connected to the first pushing part and forms an angle with the first pushing part.
[0013] Through the above scheme, the combination of the first and second pushing parts forms a multi-layered support structure. The first pushing part mainly bears the supporting and pushing function of the foundation, while the second pushing part acts as a blocking and pushing force from different directions of the first pushing part, thus providing additional support. This allows the upper plastic to better resist deformation and cracking when subjected to greater external forces or internal pressure, thereby improving the sealing effect. The angled design between the second and first pushing parts allows for optimization of the angle during the design phase. For example, the size of the angle can be adjusted according to different usage scenarios and performance requirements to achieve optimal structural strength and sealing performance. By forming an angle between the second and first pushing parts, the structural stability, sealing performance, and assembly accuracy of the secondary battery cover are improved.
[0014] In one possible design, the second pusher extends toward the pole through hole and is perpendicular to the first pusher.
[0015] With the above design, the second abutting part is perpendicular to the first abutting part, forming a T-shaped support system. The vertical second abutting part directly abuts against the area around the terminal hole, providing direct support. When the battery is subjected to external impact or internal pressure changes, this vertical support effectively prevents deformation of the cover plate around the terminal hole. For example, during battery charging and discharging, a certain expansion force may be generated inside the battery; the vertical second abutting part can directly resist this expansion force, maintaining the stability of the cover plate's shape.
[0016] The second abutment extends towards the terminal through-hole and is perpendicular to the first abutment. This structure creates a double sealing path. The first abutment provides a seal in the horizontal direction, while the second abutment further strengthens the seal in the vertical direction. If liquid or gas attempts to enter the battery through the gaps around the terminal through-hole, it must first overcome the seal of the first abutment and then the seal of the second abutment, greatly increasing the reliability of the seal.
[0017] The vertical structure formed by the second and first thrust sections increases the structural rigidity. Compared to a simple unidirectional reinforcing rib, the vertical structure better resists bending and torsional forces. During battery use, various complex stress conditions may occur, such as the impact of a vehicle collision. The vertical second and first thrust sections enable the cover to maintain high structural rigidity under these complex stress environments, reducing the risk of damage.
[0018] In one possible design, the connection between the first and second pushing parts and / or the connection between the cover plate body is provided with a transition fillet.
[0019] The above solution addresses the issue that sharp edges in mechanical structures often become stress concentration points, easily leading to material fatigue and structural damage. By incorporating rounded corners at the connections between the first and second pushing parts, and between the first pushing part and the cover plate body, stress concentration can be effectively reduced. These rounded corners allow stress to be evenly distributed at the connections, preventing cracks or fractures caused by stress concentration, thereby improving the overall structural strength and durability of the cover plate.
[0020] In one possible design, a recessed structure is provided on the upper surface of the cover plate body, surrounding the periphery of the pole post through hole, and a reinforcing rib is located above the recessed structure.
[0021] Through the above-described scheme, the recessed structure can improve the accuracy and efficiency of assembly. During assembly, the recessed structure serves as a positioning reference, making the fit between the terminal and the cover plate smoother and reducing friction and resistance. The recessed structure increases the tolerance of the assembly. Even with minor errors during assembly, the recessed structure can adapt to these errors through its elastic deformation, thus ensuring the sealing performance and structural stability after assembly. The recessed structure can improve the flow properties of materials during injection molding. It allows the plastic material to fill the mold more smoothly, reducing product defects caused by uneven material flow or air bubbles, and improving the quality of injection molding. The recessed structure provides a more stable support platform for the reinforcing ribs. Due to the presence of the recessed structure, the reinforcing ribs can better transfer force to the cover plate body when subjected to external forces, thereby enhancing the local strength of the cover plate around the terminal through-hole. Therefore, this design can significantly improve the structural strength, sealing performance, manufacturing quality, and assembly efficiency of the secondary battery cover plate.
[0022] In one possible design, the reinforcing rib is integrally stamped with the cover plate body.
[0023] Through the above-described design, the integrally stamped reinforcing ribs and the cover plate body form a single structure, avoiding the weak connection problems that may occur in traditional welded or split structures. This integrated design significantly improves the structural strength and stability of the cover plate around the terminal hole, enabling it to better withstand external impacts and internal pressures. During the stamping process, the internal stress distribution of the material is more uniform. Compared with welding, integral stamping reduces stress concentration caused by localized heating, thereby improving the fatigue resistance and service life of the cover plate. In the design of battery cover plates, the integral stamping design of the reinforcing ribs and the cover plate body not only improves the structural strength and sealing performance of the cover plate but also optimizes the production process and reduces production costs.
[0024] In one possible design, a mechanical interlocking structure is formed between the upper plastic and the reinforcing ribs.
[0025] Through the above-described solution, the mechanical interlocking structure tightly bonds the upper plastic and reinforcing ribs together via physical interlocking, significantly improving the connection strength between the two. This structure effectively prevents separation or loosening caused by external forces during use, thereby improving the overall stability of the cover. The mechanical interlocking structure can disperse stress and avoid stress concentration. When the cover is subjected to external impact or internal pressure, the stress can be evenly distributed through the interlocking structure, reducing the risk of excessive local stress and thus improving the cover's compressive strength and impact resistance. This tight connection provides a better sealing effect, ensuring the battery's sealing performance in various environments.
[0026] In one possible design, the sidewalls of the first and / or second pushing parts are provided with grooves or protrusions, and the upper plastic fills the grooves or covers the protrusions to form a mechanical interlocking structure.
[0027] By employing the above-described method, and by providing grooves or protrusions on the sidewalls of the first and / or second pushing parts, and allowing the upper plastic to fill or cover these structures, a mechanical interlock can be formed. This interlocking structure significantly enhances the connection strength between the upper plastic and the reinforcing ribs, preventing separation or loosening due to external forces during use.
[0028] Secondly, this application provides a battery assembly, comprising: a battery casing having an open end; a secondary battery cover as described above, sealed and assembled at the open end; a cell assembly disposed within the battery casing, wherein the positive electrode tab and the negative electrode tab of the cell assembly are electrically connected to the positive electrode post and the negative electrode post of the secondary battery cover, respectively; and a sealing structure disposed at the junction of the secondary battery cover and the battery casing to achieve internal sealing of the battery casing.
[0029] The beneficial effects of the battery assembly provided in the second aspect and the various possible designs of the second aspect can be found in the first aspect and the various possible implementations of the first aspect, and will not be repeated here.
[0030] The above description is merely an overview of the technical solutions of the embodiments of this application. In order to better understand the technical means of the embodiments of this application and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the embodiments of this application more obvious and understandable, specific implementation methods of this application are described below. Attached Figure Description
[0031] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0032] Figure 1 This is a schematic diagram of the main structure of a secondary battery cover in the prior art.
[0033] Figure 2 for Figure 1 A partial sectional view of the main structure of the cover plate.
[0034] Figure 3 This is an exploded view of the secondary battery cover structure provided in one embodiment of this application.
[0035] Figure 4 for Figure 3A sectional view of the main structure of the cover plate.
[0036] Figure 5 for Figure 4 Enlarged schematic diagram of region A in the middle.
[0037] Figure 6 This is a schematic diagram of the main structure of the secondary battery cover plate provided in one embodiment of this application.
[0038] Figure 7 for Figure 6 A sectional view of the main structure of the cover plate.
[0039] Figure 8 for Figure 7 A magnified view of region B in the middle.
[0040] Figure 9 This is a schematic diagram of a battery assembly provided in one embodiment of this application.
[0041] Explanation of reference numerals in the attached figures:
[0042] 100. Cover plate body; 110. Terminal post; 111. Sealing ring; 120. Upper plastic; 130. Lower plastic; 200. Reinforcing rib; 201. First pushing part; 202. Second pushing part; 300. Recessed structure; Area A; Area B; 1. Battery cover plate; 2. Battery casing; 3. Cell assembly. Detailed Implementation
[0043] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.
[0045] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0046] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist simultaneously, or B exists. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.
[0047] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. For example, in the description of this application, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0048] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.
[0049] In the description of this application, unless otherwise stated, "multiple" means two or more (including two), and similarly, "multiple groups" means two or more (including two groups).
[0050] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, "connection" or "linkage" in mechanical structures can refer to a physical connection, such as a fixed connection, for example, a connection fixed by a partition, such as a connection fixed by screws, bolts, or other partitions; a physical connection can also be a detachable connection, such as a snap-fit or interlocking connection; a physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In circuit structures, "connection" or "linkage" can refer not only to a physical connection but also to an electrical connection or a signal connection. For example, it can be a direct connection, i.e., a physical connection, or an indirect connection through at least one intermediate element, as long as the circuit is connected; it can also refer to the internal connection of two elements. A signal connection can refer not only to a signal connection through a circuit but also to a signal connection through a medium, such as radio waves. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0051] As can be seen from the background technology, the secondary battery cover in the existing technology still needs to be improved.
[0052] Figure 1 This is a schematic diagram of the cover body 100 of a secondary battery cover in the prior art. Figure 2 for Figure 1 A partial sectional view of the cover plate body 100 structure. Please refer to... Figure 1 and Figure 2 In existing secondary battery cover assembly processes, the terminal post 110 is typically fixed to the cover body 100 using injection molding. However, in the current structural design of the cover body 100, the terminal post 110 is only bonded to the cover body 100 by a plastic insulating component, resulting in insufficient structural strength. When the battery is subjected to external impact or internal pressure changes, the terminal post 110 is prone to displacement or deformation, which can affect sealing performance and even lead to electrolyte leakage, seriously threatening the safe operation of the battery. Furthermore, due to limitations in manufacturing processes and assembly precision, the bonding strength between the existing plastic insulating component and the cover body 100 is limited. Under the influence of long-term vibration or temperature changes, problems such as loosening of the plastic component and detachment of the terminal post 110 may occur, further reducing the reliability and lifespan of the battery.
[0053] In view of this, this application provides a secondary battery cover and battery assembly. The cover body 100 is provided with through holes for terminal posts 110. A reinforcing rib 200 is disposed on the outer periphery of the through holes for terminal posts 110. The reinforcing rib 200 includes a first pushing part 201, which protrudes from the plane of the cover body 100 and is embedded between the inner and outer contours of the upper plastic 120. The reinforcing rib 200 enables the plastic insulating component to be more firmly bonded to the cover body 100, improving the structural stability of the cover and thus preventing deformation, loosening, or displacement of the terminal posts 110 after assembly. Furthermore, the upper plastic 120 and the reinforcing rib 200 cooperate with each other, making the upper plastic 120 more secure and less prone to falling off, thereby improving the reliability and service life of the battery.
[0054] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.
[0055] Figure 3 This is an exploded view of the secondary battery cover structure provided in one embodiment of this application. Figure 4 for Figure 3 A sectional view of the cover plate body 100 structure. Figure 5 for Figure 4 A magnified view of region A in the middle. Please refer to this diagram. Figure 3 , Figure 4 and Figure 5 The secondary battery cover provided in this embodiment includes: a cover body 100, an electrode post 110, an upper plastic 120, and a reinforcing rib 200.
[0056] The cover plate body 100 is provided with a through hole for the pole post 110; the pole post 110 passes through the through hole for the pole post 110; the upper plastic 120 is injection molded on the upper surface of the cover plate body 100 and covers the circumferential part of the pole post 110; the reinforcing rib 200 is provided on the outer periphery of the through hole for the pole post 110, and the reinforcing rib 200 includes a first pushing part 201, which protrudes from the plane of the cover plate body 100 and is embedded between the inner contour and the outer contour of the upper plastic 120.
[0057] In this embodiment, the cover plate body 100 is typically a square plate structure with through holes for the electrode posts 110 extending along the thickness direction, allowing the electrode posts 110 to pass through and electrically connect to the battery cells inside the battery casing. In the dual electrode post 110 structure, there are two through holes for the electrode posts 110, distributed at both ends along the length of the cover plate body 100, corresponding to the positive electrode post 110 and the negative electrode post 110, respectively. The cover plate body 100 can be made of aluminum alloy or stainless steel, with a thickness of 0.5-2 mm.
[0058] In this embodiment, there are typically two terminals 110, namely a positive terminal 110 and a negative terminal 110. The shape and size of the terminals 110 usually correspond to the vias of the terminals 110, and they are made of conductive materials, such as copper or copper alloys with good conductivity, and are inserted into the vias of the terminals 110. The diameter of the terminals 110 can be 3-10 mm, and the length is determined according to actual needs.
[0059] In this embodiment, the upper plastic 120 is injection molded onto the upper surface of the cover plate body 100, and the material can be engineering plastics such as PPS, PBT, or PA66. The upper plastic 120 completely covers the circumferential portion of the pole post 110, forming a reliable insulation and sealing structure.
[0060] In this embodiment, the reinforcing rib 200 is disposed on the outer periphery of the through hole of the terminal post 110, and its first pushing part 201 protrudes from the plane of the cover body 100 and is embedded between the inner and outer contours of the upper plastic 120. This design can effectively enhance the structural strength of the cover body 100 around the through hole of the terminal post 110. During battery use, the terminal post 110 is subjected to various forces, such as internal battery pressure and external mechanical impact. The reinforcing rib 200 can disperse these forces and prevent the cover body 100 from deforming or breaking at the through hole of the terminal post 110. For example, in some high-energy-density battery applications, the internal battery pressure may be relatively high, and the reinforcing rib 200 can play a good supporting role to ensure the integrity of the cover. The upper plastic 120 is injection molded onto the upper surface of the cover plate body 100 and covers the circumferential portion of the electrode post 110. Simultaneously, the injection molding process embeds the reinforcing rib 200 between the inner and outer contours of the upper plastic 120, allowing the upper plastic 120 and the reinforcing rib 200 to work together. The upper plastic 120 itself has a certain degree of elasticity, which can buffer external impacts. The reinforcing rib 200 provides rigid support. The combination of the two ensures that the entire cover plate has both sufficient elastic buffering capacity and good rigid support when subjected to external forces, further improving the structural stability of the cover plate. The reinforcing rib 200, embedded between the inner and outer contours of the upper plastic 120, ensures a tighter wrapping of the upper plastic 120 around the through-hole of the electrode post 110. It acts like a "fixture," preventing the upper plastic 120 from loosening during use due to thermal expansion and contraction or mechanical vibration, thus ensuring long-term stability of the sealing effect and preventing electrolyte leakage. Due to the special design of the reinforcing rib 200 and the upper plastic 120, the terminal post 110 can be more stably fixed in the through hole during assembly. The covering effect of the upper plastic 120 and the supporting effect of the reinforcing rib 200 make the terminal post 110 less prone to deformation, loosening, or displacement after assembly. This is crucial for the assembly quality of the battery, as the accuracy of the terminal post 110's position directly affects the battery's electrical connection performance. Therefore, the above solution improves the battery's reliability and lifespan.
[0061] Furthermore, during the injection molding of the upper plastic 120, the presence of the reinforcing rib 200 can serve as a positioning and support structure, making the injection molding process smoother. The injection molding of the upper plastic 120 integrates the reinforcing rib 200 and the upper plastic 120, which also helps to improve production efficiency.
[0062] The secondary battery cover also includes a lower plastic insert 130 and a sealing ring 111. The lower plastic insert 130 is typically located between the cover body 100 and the battery core, serving as insulation and support. It may include an injection hole and a flow guiding structure for electrolyte injection and flow. The lower plastic insert 130, through its cooperation with the cover body 100, secures the terminal post 110 and the battery core, ensuring the stability of the battery's internal structure. The sealing ring 111 is generally installed on the cover body, surrounding the terminal post 110, and its shape may be a flat circular ring. The main function of the sealing ring 111 is to prevent electrolyte leakage from inside the battery, while also preventing external air and moisture from entering the battery, ensuring the battery's sealing performance.
[0063] In this embodiment, the reinforcing rib 200 and the cover plate body 100 are integrally stamped. The integrally stamped reinforcing rib 200 and the cover plate body 100 form a single structure, avoiding the weak connection problems that may occur in traditional welded or split structures. This integral design significantly improves the structural strength and stability of the cover plate around the through hole of the electrode post 110, enabling it to better withstand external impacts and internal pressures. During the stamping process, the internal stress distribution of the material is more uniform. Compared with welding, integral stamping reduces stress concentration caused by localized heating, thereby improving the fatigue resistance and service life of the cover plate. In the design of the battery cover plate, the integral stamping design of the reinforcing rib 200 and the cover plate body 100 not only improves the structural strength and sealing performance of the cover plate but also optimizes the production process and reduces production costs.
[0064] In this embodiment, the reinforcing rib 200 further includes a second pushing part 202, which is fixedly connected to the first pushing part 201 and forms an angle with the first pushing part 201.
[0065] The second pushing part 202 can be located at any position in the height direction of the first pushing part 201, or it can be located at the top of the first pushing part 201 in the height direction.
[0066] The second pushing part 202 can extend towards the pole post 110 or away from the pole post 110, or it can form a "T" shape, that is, extend in both directions. This can increase the firmness after injection molding.
[0067] Through the above scheme, the first pushing part 201 protrudes from the plane of the cover plate body 100, which is equivalent to providing a pushing force in the direction surrounding the pole post 110, making the upper plastic 120 and the pole post 110 more stable. The second pushing part 202 forms an angle with the first pushing part 201, which means that the combination of the first pushing part 201 and the second pushing part 202 forms a multi-layer support structure. The first pushing part 201 mainly undertakes the support and pushing function of the foundation, while the second pushing part 202 plays a blocking and pushing role from different directions of the first pushing part 201, thereby providing additional support. This allows the upper plastic 120 to better resist deformation and cracking when subjected to greater external force or internal pressure, thereby improving the sealing effect. The design of the angle between the second pushing part 202 and the first pushing part 201 allows the angle to be optimized during the design stage. For example, the size of the angle can be adjusted according to different usage scenarios and performance requirements to achieve the best structural strength and sealing performance. By forming an angle between the second pushing part 202 and the first pushing part 201, the structural stability, sealing performance, and assembly accuracy of the secondary battery cover are improved.
[0068] Please continue to refer to this. Figure 5 In this embodiment, the second pushing part 202 extends toward the through hole of the pole post 110, and the second pushing part 202 is perpendicular to the first pushing part 201.
[0069] With the above design, the second pushing part 202 is perpendicular to the first pushing part 201, and this vertical structure forms a "T"-shaped support system. The vertical second pushing part 202 can directly push against the area around the through hole of the terminal post 110, providing direct support. When the battery is subjected to external impact or internal pressure changes, this vertical support can effectively prevent the cover plate from deforming around the through hole of the terminal post 110. For example, during the charging and discharging process of the battery, a certain expansion force may be generated inside the battery, and the vertical second pushing part 202 can directly resist this expansion force, maintaining the shape stability of the cover plate.
[0070] The second pusher portion 202 extends towards the through hole of the terminal post 110 and is perpendicular to the first pusher portion 201. This structure forms a double sealing path. The first pusher portion 201 provides a seal in the horizontal direction, while the second pusher portion 202 further strengthens the seal in the vertical direction. If liquid or gas attempts to enter the battery through the gap around the through hole of the terminal post 110, it must first overcome the seal of the first pusher portion 201 and then the seal of the second pusher portion 202, greatly increasing the reliability of the seal.
[0071] The second pushing part 202 and the first pushing part 201 form a vertical structure, increasing the rigidity of the structure. Compared with a simple unidirectional reinforcing rib 200, the vertical structure can better resist bending and torsional forces. During battery use, various complex stress conditions may be encountered, such as the impact on the battery during a vehicle collision. The vertical second pushing part 202 and the first pushing part 201 enable the cover to maintain high structural rigidity under these complex stress environments, reducing the risk of damage.
[0072] In this embodiment, the connection between the first pushing part 201 and the second pushing part 202, as well as the connection between the first pushing part 201 and the cover plate body 100, can be set as a transition rounded corner.
[0073] In mechanical structures, sharp edges and corners are often areas of stress concentration, which can easily lead to material fatigue and structural damage. By providing transition fillets at the connection between the first pushing part 201 and the second pushing part 202, and at the connection between the first pushing part 201 and the cover plate body 100, stress concentration can be effectively reduced. The fillets allow stress to be evenly distributed at the connection points, preventing cracks or fractures caused by stress concentration, thereby improving the overall structural strength and durability of the cover plate.
[0074] Figure 6 This is a schematic diagram of the cover body 100 of the secondary battery cover provided in this embodiment. Figure 7 for Figure 6 A sectional view of the cover plate body 100 structure. Figure 8 for Figure 7 A magnified view of region B in the middle. Please refer to this diagram. Figure 6 Figure 7 and Figure 8 In this embodiment, a recessed structure 300 is provided on the upper surface of the cover plate body 100 and around the periphery of the through hole of the pole post 110, and the reinforcing rib 200 is located above the recessed structure 300.
[0075] The reinforcing rib 200 can be set at the outer edge of the recessed structure 300.
[0076] Through the above-described scheme, the recessed structure 300 can improve the accuracy and efficiency of assembly. During assembly, the recessed structure 300 serves as a positioning reference, making the fit between the pole post 110 and the cover plate smoother and reducing friction and resistance during assembly. The recessed structure 300 increases the tolerance of assembly. Even with minor errors during assembly, the recessed structure 300 can adapt to these errors through its elastic deformation, thereby ensuring the sealing and structural stability after assembly. The recessed structure 300 can improve the flow properties of materials during injection molding. It allows the plastic material to fill the mold more smoothly, reducing product defects caused by uneven material flow or air bubbles, and improving the quality of injection molding. The recessed structure 300 can provide a more stable support platform for the reinforcing rib 200. Due to the presence of the recessed structure 300, the reinforcing rib 200 can better transfer force to the cover plate body 100 when subjected to external forces, thereby enhancing the local strength of the cover plate around the through hole of the pole post 110. Therefore, this design can significantly improve the structural strength, sealing performance, manufacturing quality, and assembly efficiency of the secondary battery cover.
[0077] Please continue to refer to this. Figure 6 , Figure 7 and Figure 8 In this embodiment, the cross-section of the first pushing part 201 is annular.
[0078] The annular structure can evenly distribute force around the through hole of the terminal post 110. When the battery is subjected to external impact or internal pressure, the annular pushing part can evenly transfer the force to the cover body 100 and the upper plastic 120, avoiding local stress concentration, thereby improving the overall strength and stability of the cover. The annular structure design is compact and can make full use of the limited space around the through hole of the terminal post 110, allowing the overall size of the cover to be designed to be smaller while maintaining sufficient structural strength.
[0079] In some embodiments, the cross-section of the first pushing portion 201 may be wavy.
[0080] The wavy structure, with its undulating shape, significantly enhances the bending resistance of the cover plate around the through-hole of the terminal post 110. When subjected to bending forces, the wavy undulations act like a spring, dispersing stress and preventing deformation or breakage of the cover plate in the bending direction. Under repeated stress, the wavy structure better resists fatigue failure. For example, during battery charging and discharging, the terminal post 110 may experience slight displacement due to temperature changes; the wavy structure effectively absorbs the stress generated by these slight displacements, extending the lifespan of the cover plate.
[0081] Please continue to refer to this. Figure 3The cross-section of the first pushing part 201 is a discontinuous protrusion structure. The discontinuous protrusion structure can be a pair of protrusion structures stacked together, or it can be a discontinuous protrusion structure evenly distributed along the through hole of the pole post 110.
[0082] Intermittent raised structures can provide localized reinforcement at critical locations. This design allows for targeted placement of raised sections in areas of high stress, based on the stress distribution around the through-hole of the pole post 110, thereby increasing the strength of the cover plate at these critical locations. Intermittent raised structures are easier to implement during injection molding because they do not place excessive demands on the injection mold as they do on continuous annular or wavy structures. This helps reduce production costs while maintaining production efficiency.
[0083] In some embodiments, a mechanical interlocking structure is formed between the upper plastic 120 and the reinforcing rib 200.
[0084] The mechanical interlocking structure tightly binds the upper plastic 120 and the reinforcing rib 200 together through physical interlocking, significantly improving the connection strength between the two. This structure effectively prevents separation or loosening caused by external forces during use, thereby improving the overall stability of the cover. The mechanical interlocking structure also disperses stress, preventing stress concentration. When the cover is subjected to external impact or internal pressure, the stress is evenly distributed through the interlocking structure, reducing the risk of excessive local stress and thus improving the cover's compressive strength and impact resistance. This tight connection provides a better sealing effect, ensuring the battery's airtightness in various environments.
[0085] In some embodiments, the sidewalls of the first pushing part 201 and / or the second pushing part 202 are provided with grooves or protrusions, and the upper plastic 120 fills the grooves or covers the protrusions to form a mechanical interlocking structure.
[0086] By providing grooves or protrusions on the sidewalls of the first pushing part 201 and / or the second pushing part 202, and allowing the upper plastic 120 to fill or cover these structures, a mechanical interlock can be formed. This interlocking structure significantly enhances the connection strength between the upper plastic 120 and the reinforcing rib 200, preventing separation or loosening due to external forces during use.
[0087] Figure 9 This is a schematic diagram of the battery assembly provided in this embodiment. Please refer to... Figure 9Based on the above embodiments, this embodiment also provides a battery assembly including: a battery housing 2, a battery cover plate 1, and a cell assembly 3. The battery housing 2 has an open end; the cover plate has a structure as described in any of the above embodiments for the secondary battery cover plate 1, and the battery cover plate 1 is sealed and assembled at the open end; the cell assembly 3 is disposed inside the battery housing 2, and the positive electrode tab and negative electrode tab of the cell assembly 3 are electrically connected to the positive electrode post and negative electrode post of the secondary battery cover plate 1, respectively; a sealing structure is disposed at the joint between the secondary battery cover plate 1 and the battery housing 2, which can achieve internal sealing of the battery housing 2.
[0088] Since the structure and beneficial effects of the secondary battery cover 1 have been described in detail in the previous embodiments, they will not be repeated here.
[0089] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.
Claims
1. A secondary battery cover, characterized in that, include: The cover plate body is provided with a pole post through hole; The electrode post is inserted into the electrode post through hole; Plastic is injection molded onto the upper surface of the cover plate body and covers the circumferential portion of the pole post; A reinforcing rib is provided on the outer periphery of the through hole of the pole post. The reinforcing rib includes a first pushing part, which protrudes from the plane of the cover plate body and is embedded between the inner and outer contours of the upper plastic.
2. The secondary battery cover plate according to claim 1, characterized in that, The cross-section of the first pushing part is annular, wavy, or discontinuous.
3. The secondary battery cover plate according to claim 2, characterized in that, The reinforcing rib also includes a second pushing part, which is fixedly connected to the first pushing part and forms an angle with the first pushing part.
4. The secondary battery cover plate according to claim 3, characterized in that, The second pushing part extends toward the pole post through hole, and the second pushing part is perpendicular to the first pushing part.
5. The secondary battery cover plate according to claim 3 or 4, characterized in that, The connection between the first pushing part and the second pushing part and / or the connection between the cover plate body are provided with a transition rounded corner.
6. The secondary battery cover plate according to claim 1, characterized in that, A recessed structure is provided on the upper surface of the cover plate body and around the periphery of the pole post through hole, and the reinforcing rib is located above the recessed structure.
7. The secondary battery cover plate according to claim 6, characterized in that, The reinforcing rib is integrally stamped with the cover plate body.
8. The secondary battery cover plate according to claim 3, characterized in that, The upper plastic and the reinforcing rib form a mechanical interlocking structure.
9. The secondary battery cover plate according to claim 8, characterized in that, The sidewalls of the first and / or second pushing parts are provided with grooves or protrusions, and the upper plastic fills the grooves or covers the protrusions to form the mechanical interlocking structure.
10. A battery assembly, characterized in that, include: Battery casing with an open end; The secondary battery cover plate as described in any one of claims 1-9 is sealed and assembled to the opening end; A battery cell assembly is disposed inside the battery casing, and the positive and negative tabs of the battery cell assembly are electrically connected to the positive and negative terminals of the secondary battery cover plate, respectively. A sealing structure is provided at the junction of the secondary battery cover and the battery casing to achieve internal sealing of the battery casing.