Top cover assembly and battery

Abstract

The invention relates to the technical field of batteries, and discloses a top cover assembly and a battery, tabs are directly accommodated in accommodating grooves in the lower surface of a top cover piece, and electrical connection is realized by using through holes of an insulating plastic frame, so that a traditional adapter piece is omitted. Connection paths are obviously reduced, the internal resistance of the battery is effectively reduced, the charge and discharge energy loss is reduced, and the energy conversion efficiency and the power output capability are improved. Meanwhile, the internal resistance is reduced, so that the battery temperature rise is effectively controlled, the battery life is prolonged, and the safety and reliability are improved. In addition, the structure is simplified, the number of parts is reduced, the manufacturing cost and the assembling difficulty are reduced, the production efficiency is improved, and the error rate is reduced. According to the invention, the manufacturing and use cost is optimized while the battery performance is improved, and an innovative solution is provided for the development of a battery technology.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a top cover assembly and a battery. Background Technology

[0002] With the development of new energy technologies, batteries, as an energy storage device, are being used more and more frequently in people's daily lives, and have almost become an indispensable item in life.

[0003] In existing batteries, the connection between the terminal post and the tab is typically achieved using an adapter plate. Specifically, one end of the adapter plate is ultrasonically welded to the tab, and the other end is ultrasonically welded to the terminal post. This connection method has the following problems:

[0004] (1) Due to the introduction of the adapter, an additional connection path is added between the terminal and the tab. According to circuit principles, the increase in the connection path will inevitably lead to an increase in the overall internal resistance of the battery. The increase in internal resistance will not only cause more energy loss during the charging and discharging process and reduce the energy conversion efficiency of the battery, but will also affect the output performance of the battery and lead to a decrease in the power output capability of the battery.

[0005] (2) High internal resistance is one of the important reasons for excessive temperature rise during battery charging and discharging. When the battery is charging and discharging, the current passing through the battery generates Joule heat. The higher the internal resistance, the more heat is generated. Excessive temperature rise will have a serious negative impact on battery performance and lifespan.

[0006] (3) Using an adapter plate to connect the terminal post and the tab requires an additional adapter plate component, which not only increases the manufacturing cost of the battery, but also increases the difficulty of battery assembly.

[0007] Therefore, optimizing the connection between the electrode post and the electrode tab, reducing internal resistance and temperature rise, and simplifying the structure are urgent problems to be solved in the current battery manufacturing technology field.

[0008] The above information is provided as background information only to aid in understanding the present invention, and does not constitute an assertion or admission that any of the above content can be used as prior art relative to the present invention. Summary of the Invention

[0009] This invention provides a top cover assembly and a battery to solve the problems existing in the prior art.

[0010] To achieve the above objectives, the present invention provides the following technical solution:

[0011] In a first aspect, the present invention provides a top cover assembly, comprising a top cover sheet and an insulating plastic frame, wherein...

[0012] The top cover plate is recessed from the lower surface to the upper surface to form a receiving groove for accommodating the electrode tab;

[0013] The insulating plastic frame is located on the lower surface of the top cover sheet and is adapted to the shape of the top cover sheet;

[0014] The insulating plastic frame has through holes through which the electrode tabs can pass and be electrically connected to the bottom of the receiving groove.

[0015] Furthermore, in the top cover assembly, the thickness of the bottom of the receiving groove at the position corresponding to the through hole is less than the thickness at other positions.

[0016] Furthermore, in the top cover assembly, at least one of the receiving grooves has an inclined groove wall.

[0017] Furthermore, in the top cover assembly, the through hole is rectangular.

[0018] Furthermore, in the top cover assembly, the top cover sheet is stamped from an aluminum plate.

[0019] Secondly, the present invention provides a battery, comprising a casing, a bare cell, a positive electrode top cover assembly, and a negative electrode top cover assembly; wherein...

[0020] The negative electrode top cover assembly is the top cover assembly provided in the first aspect above;

[0021] The bare battery cell has a positive electrode tab and a negative electrode tab;

[0022] The housing has a space for accommodating the bare battery cell;

[0023] The positive electrode top cover assembly covers one of the openings of the housing;

[0024] The negative electrode top cover assembly covers another opening in the housing.

[0025] Furthermore, in the battery, the positive electrode top cover assembly includes a positive electrode cover plate and a positive electrode post;

[0026] The positive electrode cover plate is provided with a positive electrode post hole;

[0027] The positive electrode post includes a positive electrode post body; the positive electrode post body is disposed through the positive electrode post hole;

[0028] The positive electrode post body is recessed from the lower surface to the upper surface to form a groove;

[0029] The bottom of the groove is used to make an electrical connection with the positive electrode tab by ultrasonic welding.

[0030] Furthermore, in the battery, the thickness at the groove location in the positive electrode post body is less than the thickness at other locations.

[0031] Furthermore, in the battery, the bottom of the groove is provided with several protrusions.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The present invention provides a top cover assembly and a battery, which effectively solves many problems existing in the connection method of terminals and tabs in existing batteries through a unique structural design.

[0034] First, by creating a receiving groove on the lower surface of the top cover, the tabs are directly housed within it, and the electrical connection between the tabs and the top cover is achieved through the through holes in the insulating plastic frame. This eliminates the need for traditional adapter plates, significantly reducing the connection path and effectively lowering the battery's internal resistance. This improvement not only reduces energy loss during charging and discharging and improves the battery's energy conversion efficiency, but also enhances the battery's power output capability, making it perform better in high-power applications.

[0035] Secondly, due to the reduced internal resistance, the heat generated by the battery during charging and discharging is significantly reduced, effectively controlling the battery's temperature rise, thereby extending its lifespan and improving its safety and reliability. Furthermore, the simplified connection method reduces the number of components, lowering battery manufacturing costs, while also simplifying the assembly process, improving production efficiency, and reducing the error rate during production.

[0036] In summary, the top cover assembly of the present invention improves battery performance while optimizing battery manufacturing and usage costs, providing an innovative and effective solution for the development of battery technology.

[0037] The present invention has other features and advantages, which will be apparent from or will be set forth in detail in the accompanying drawings and the following detailed description, which together serve to explain the particular principles of the invention. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1This is a top view structural diagram of a top cover assembly provided in Embodiment 1 of the present invention;

[0040] Figure 2 This is a schematic diagram (from below) of the top cover assembly provided in Embodiment 1 of the present invention;

[0041] Figure 3 This is a schematic diagram of the (three-dimensional) structure of a battery provided in Embodiment 2 of the present invention;

[0042] Figure 4 This is a schematic diagram of a battery structure (three-dimensional, with the negative electrode top cover assembly not closed) provided in Embodiment 2 of the present invention;

[0043] Figure 5 This is a schematic diagram of the (cross-sectional) structure of a battery provided in Embodiment 2 of the present invention;

[0044] Figure 6 This is a three-dimensional structural schematic diagram of the positive electrode top cover assembly provided in Embodiment 2 of the present invention;

[0045] Figure 7 This is a three-dimensional structural schematic diagram of the positive electrode post provided in Embodiment 2 of the present invention;

[0046] Figure 8 This is a schematic diagram of the (cross-sectional) structure of the positive electrode post provided in Embodiment 2 of the present invention;

[0047] Figure 9 This is a top view structural diagram of the positive electrode post provided in Embodiment 2 of the present invention.

[0048] Figure label:

[0049] Top cover 1, insulating plastic frame 2, receiving groove 3, through hole 4;

[0050] 100 for the casing, 200 for the bare cell, 300 for the positive electrode top cover assembly, 400 for the negative electrode top cover assembly, 500 for the positive electrode tab, and 600 for the negative electrode tab;

[0051] Positive electrode cover plate 3001, positive electrode post body 3002, groove 3003, protrusion 3004. Detailed Implementation

[0052] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] Example 1

[0054] Please refer to Figure 1-2 This invention provides a top cover assembly, including a top cover sheet 1 and an insulating plastic frame 2, wherein...

[0055] The lower surface of the top cover 1 is recessed towards the upper surface, thus forming a receiving groove 3 for accommodating the electrode tab. This receiving groove 3 is designed to provide a space for the electrode tab, ensuring that the electrode tab remains stable during subsequent connection and use, and avoiding problems such as poor contact caused by shaking or displacement.

[0056] The insulating plastic frame 2 is cleverly positioned on the lower surface of the top cover plate 1, and its overall shape is adapted to the top cover plate 1. This adaptability design not only ensures a tight fit between the insulating plastic frame 2 and the top cover plate 1, enhancing structural stability, but also effectively prevents gaps caused by shape mismatch, avoiding the entry of external impurities or moisture into the battery, thus preventing potential threats to battery performance and safety. Furthermore, the insulating plastic frame 2 also has a through hole 4 for the tab to pass through. Through this through hole 4, the tab can be directly electrically connected to the top cover plate 1 (specifically, to the bottom of the receiving groove 3), providing the necessary electrical path for the normal charging and discharging function of the battery.

[0057] The top cover assembly proposed in this invention, with its unique and ingenious structural design, successfully and effectively solves many thorny problems existing in the connection method of the terminal post and the tab in the current battery, bringing new breakthroughs and possibilities for the further development of battery technology.

[0058] First, from the perspective of connection path and internal resistance, by specially setting a receiving groove 3 on the lower surface of the top cover plate 1, the electrode tab is directly and precisely housed within it, and the through hole 4 on the insulating plastic frame 2 is cleverly used to achieve the electrical connection between the electrode tab and the top cover plate 1. This innovative connection method completely eliminates the adapter piece required in traditional connection methods, thereby greatly reducing the length of the connection path. According to basic circuit principles, shortening the connection path means a significant reduction in the battery's internal resistance. The reduction in internal resistance has many important implications. On the one hand, during the charging and discharging process of the battery, it can effectively reduce the energy loss caused by internal resistance. The reduction in energy loss directly improves the battery's energy conversion efficiency, allowing more electrical energy to be effectively utilized instead of being wasted as heat. On the other hand, the reduction in internal resistance also significantly improves the battery's power output capability. In high-power application scenarios, such as the rapid acceleration of electric vehicles and the instantaneous high-power discharge of large energy storage devices, the battery needs to have a strong power output capability. The top cover assembly of this invention, by reducing internal resistance, enables the battery to perform better in these high-power application scenarios, meeting the needs of practical applications.

[0059] Secondly, considering factors such as battery temperature rise, lifespan, safety, reliability, manufacturing cost, and production efficiency, the reduced internal resistance significantly decreases the heat generated during charging and discharging. This substantial reduction in heat effectively controls battery temperature rise, preventing damage to the internal structure due to excessive heat. High temperatures accelerate the rate of internal chemical reactions, leading to faster capacity decay and shortened lifespan. The top cover assembly of this invention effectively extends battery life and improves durability by controlling temperature rise. Simultaneously, temperature rise control significantly enhances battery safety and reliability. Excessive temperatures can trigger internal safety hazards such as battery swelling, leakage, or even explosion, seriously threatening the life and property of users. The top cover assembly of this invention effectively reduces the probability of these safety hazards by lowering internal resistance and controlling temperature rise, providing strong protection for safe battery use. Furthermore, the simplified connection method reduces the number of components. This reduction directly lowers battery manufacturing costs, including raw material procurement costs, processing and manufacturing costs, and assembly costs. Simultaneously, the assembly process is also simplified, significantly improving production efficiency. In the production process, the simplified assembly process reduces the number of operation steps and complexity, lowers the error rate in the production process, improves the product qualification rate, and further enhances the company's economic benefits and market competitiveness.

[0060] In summary, the top cover assembly proposed in this invention significantly improves battery performance while comprehensively optimizing battery manufacturing and usage costs. It provides an innovative and effective solution for battery technology development and is expected to be widely applied and promoted in the future battery market, driving the entire battery industry towards higher performance, lower cost, and higher safety.

[0061] In one embodiment of this invention, the bottom of the receiving groove 3 is significantly thinner at the location corresponding to the through hole 4 compared to its thickness at other locations. This special design is not arbitrary but rather based on important technical considerations. The thinner bottom facilitates the ultrasonic welding of the tab and the top cover plate 1. Compared to traditional laser welding, ultrasonic welding has significant advantages in the scenario described in this invention, offering superior welding quality and ensuring a stable and reliable connection between the tab and the top cover plate 1. This effectively avoids various problems that may arise due to poor welding, providing a solid guarantee for the stable operation of the battery.

[0062] In one embodiment of this invention, the receiving groove 3 provided on the top cover plate 1 has undergone more refined structural optimization, specifically, at least one of the receiving grooves 3 has its groove wall set at an angle.

[0063] From the perspective of ease of tab insertion, when the wall of the receiving groove 3 is inclined, the inclined wall provides excellent guidance during the insertion of the tab. Compared to a vertically oriented wall, the inclined wall guides the tab gradually into the receiving groove 3, reducing insertion difficulties caused by collisions or jamming with the wall. Especially during large-scale battery assembly on production lines, this design, which improves insertion convenience, significantly enhances assembly efficiency, reduces production stoppages or rework due to tab insertion problems, thereby lowering production costs and increasing production efficiency.

[0064] From the perspective of the fit between the tab and the receiving groove 3, the inclined groove wall allows for a tighter fit between the tab and the receiving groove 3. When the tab is inserted into the receiving groove 3 with its inclined wall, due to the inclination angle of the groove wall, the tab will fit more tightly against the groove wall under its own weight and the pressure during assembly. This tight fit effectively increases the contact area between the tab and the top cover plate 1. According to electrical principles, an increased contact area helps reduce contact resistance. The reduction in contact resistance further reduces energy loss during charging and discharging, improves the energy conversion efficiency of the battery, and thus enhances the overall performance of the battery. At the same time, the tight fit also enhances the connection stability between the tab and the top cover plate 1, reducing the loosening or detachment of the tab due to external factors such as vibration and impact, and improving the reliability and safety of the battery.

[0065] From a heat dissipation perspective, the sloping tank wall design is beneficial for battery heat dissipation to a certain extent. During battery charging and discharging, the tabs, acting as current conduction channels, generate heat. When the tank wall of the receiving tank 3 is sloping, air can flow more smoothly within the space created by the sloping tank wall. Good airflow accelerates heat dissipation, carrying away the heat generated by the tabs in a timely manner and preventing heat accumulation inside the battery. Effective heat dissipation can prevent problems such as performance degradation, shortened lifespan, and safety hazards caused by excessively high battery temperatures, further ensuring the normal operation and safe use of the battery.

[0066] In summary, in this embodiment, at least one of the receiving slots 3 has an inclined wall, which provides strong support for improving battery performance, ensuring reliability, and increasing production efficiency by optimizing the ease of inserting the tab, improving the fit between the tab and the receiving slot, and enhancing heat dissipation performance.

[0067] In one embodiment of this invention, the through hole 4 on the insulating plastic frame 2 is designed to be rectangular.

[0068] It should be noted that, firstly, the rectangular through-hole 4 better matches the shape of the tab. In actual battery manufacturing, tabs typically have a certain width and thickness, and their cross-sectional shape is often close to a rectangle or a similar elongated strip. Designing the through-hole 4 as rectangular allows for smoother tab insertion, reducing friction and resistance caused by shape mismatch. This precise fit effectively prevents the tab from getting stuck, deformed, or even damaged when inserting into the through-hole 4, ensuring that the tab can pass through the through-hole 4 completely and stably, thereby achieving a reliable electrical connection with the top cover plate 1. For example, during battery assembly on an automated production line, the precisely fitted through-hole 4 can improve assembly efficiency, reduce production failures and defect rates caused by tab insertion problems, and ensure the continuity and stability of production.

[0069] Secondly, the rectangular through-hole 4 helps optimize the electrical connection between the tabs and the top cover plate 1. During battery charging and discharging, current needs to be conducted to the top cover plate 1 through the tabs and through-hole 4. The rectangular through-hole 4 provides a larger contact area, allowing for more thorough contact between the tabs and the top cover plate 1. According to electrical principles, increasing the contact area can effectively reduce contact resistance and decrease energy loss during current conduction. Lower contact resistance improves the battery's energy conversion efficiency, allowing more electrical energy to be effectively utilized instead of being wasted as heat. Simultaneously, a good electrical connection ensures stable battery operation during high-power charging and discharging, avoiding problems such as localized overheating and voltage fluctuations caused by poor contact, thus improving the battery's power output capability and stability.

[0070] Furthermore, the rectangular through-hole 4 also facilitates battery heat dissipation. During battery charging and discharging, heat is generated around the tabs and through-hole 4. The rectangular through-hole 4 has a larger opening area, providing ample space for airflow. Air can flow more smoothly around the through-hole 4, accelerating heat dissipation and carrying away the heat generated by the tabs in a timely manner, preventing heat accumulation inside the battery. Effective heat dissipation can prevent battery performance degradation, shortened lifespan, and safety hazards caused by excessive temperature, further ensuring the normal operation and safe use of the battery.

[0071] Finally, from a manufacturing process perspective, the rectangular through-hole 4 is relatively simple to process and easy to achieve. During the manufacturing of the insulating plastic frame 2, common stamping and cutting processes can easily produce the rectangular through-hole 4. This simple processing method not only improves production efficiency and reduces production costs but also ensures the processing accuracy and quality of the through-hole 4. At the same time, the design of the rectangular through-hole 4 also facilitates mold design and manufacturing, further reducing mold costs and production cycle, which is beneficial for large-scale industrial production.

[0072] In one embodiment of this invention, the top cover 1 is made of aluminum plate as the base material and manufactured using a stamping process. Aluminum plate, a widely used and high-performance metal material in the industrial field, possesses many characteristics suitable for manufacturing the battery top cover 1. Its relatively low density allows the top cover 1 to effectively reduce the overall weight of the battery while maintaining a certain structural strength. This is significant for improving the battery's energy density and for applications with strict weight requirements, such as portable electronic devices and new energy vehicles, where a lighter battery helps improve portability and battery life. Simultaneously, aluminum plate has good electrical conductivity, meeting the current conduction requirements during charging and discharging, ensuring the stability and efficiency of the battery's internal electrical connections, and reducing energy loss and heat generation caused by poor material conductivity. Furthermore, aluminum plate has a certain degree of corrosion resistance, enabling it to resist a certain degree of chemical and electrochemical corrosion in the complex operating environment of the battery, extending the service life of the top cover 1 and ensuring the long-term stable operation of the battery.

[0073] Stamping, as a mature and efficient metal forming method, plays a crucial role in the manufacturing of the top cover plate 1. Through stamping, aluminum sheets can be precisely processed into the required shapes and sizes. During stamping, pressure is applied to the aluminum sheet using a stamping die, causing it to undergo plastic deformation under the action of the die, thereby forming the specific structure of the top cover plate 1, such as the receiving groove 3 for accommodating the electrode tabs mentioned earlier. Stamping offers significant advantages such as high production efficiency, high processing precision, high material utilization, and the ability to achieve mass production. High production efficiency can meet the needs of large-scale battery production, shorten the production cycle, and improve the company's production capacity and market responsiveness; high processing precision ensures that the dimensions of each part of the top cover plate 1 are accurate and the shape is consistent, ensuring precise assembly with other battery components and improving the overall quality and performance stability of the battery; high material utilization helps reduce production costs and minimize raw material waste; and mass production capability further reduces the manufacturing cost per unit product and enhances the product's market competitiveness.

[0074] In summary, in this embodiment, the selection of aluminum plate and the use of stamping process to manufacture the top cover 1 is a scientific decision that takes into account the advantages of material properties and processing technology, providing a solid foundation for battery performance improvement, quality assurance and production cost control.

[0075] Although this invention frequently uses terms such as top cover sheet and insulating plastic frame, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.

[0076] Example 2

[0077] Please refer to Figure 3-4 This invention provides a battery comprising a casing 100, a bare cell 200, a positive electrode top cover assembly 300, and a negative electrode top cover assembly 400; wherein,

[0078] The negative electrode top cover assembly 400 is the top cover assembly provided in Embodiment 1 above;

[0079] The bare battery cell 200 has a positive electrode tab 500 and a negative electrode tab 600;

[0080] The housing 100 has a space for accommodating the bare battery cell 200;

[0081] The positive electrode top cover assembly 300 is disposed over one of the openings of the housing 100;

[0082] The negative electrode top cover assembly 400 covers another opening in the housing 100.

[0083] It should be noted that the casing 100, as the basic supporting structure of the battery, is made of high-strength, corrosion-resistant materials, possessing excellent mechanical properties and chemical stability. It cleverly forms a closed space to accommodate the bare battery cell 200. This space not only provides a safe storage environment for the bare battery cell 200 but also effectively isolates it from external interference factors such as moisture and dust, preventing damage and ensuring the stability of the battery's internal environment. Simultaneously, the design of the casing 100 fully considers heat dissipation requirements; its surface may have a reasonable heat dissipation structure or use materials with good thermal conductivity to dissipate the heat generated during battery operation in a timely manner, preventing excessive temperature from affecting battery performance and lifespan.

[0084] The bare cell 200 is the core energy storage component of the battery, assembled from key materials such as positive and negative electrode materials, a separator, and electrolyte through a complex process. The bare cell 200 has a positive electrode tab 500 and a negative electrode tab 600, which are crucial channels for energy transfer between the battery and external circuits. The positive electrode tab 500 and negative electrode tab 600 are typically made of highly conductive metals such as aluminum or copper, and undergo special processing to improve their conductivity, corrosion resistance, and mechanical strength. During battery charging and discharging, the positive electrode tab 500 and negative electrode tab 600 respectively draw in or draw out electrical energy from the positive and negative electrodes, enabling energy exchange between the battery and external devices.

[0085] The positive electrode top cover assembly 300 is located at one of the openings of the housing 100, and it fits tightly with the housing 100 to form a sealed internal space for the battery. The structural design of the positive electrode top cover assembly 300 fully considers the requirements of electrical connection, sealing performance, and safety protection. Through a reliable connection with the positive electrode tab 500, the electrical energy of the positive electrode is led out of the battery.

[0086] The negative electrode top cover assembly 400 is disposed at another opening in the housing 100, opposite to the positive electrode top cover assembly 300, together forming the top structure of the battery. Due to the use of the top cover assembly provided in Embodiment 1 above, this top cover assembly has a unique design structure that offers significant advantages in improving the ease of tab insertion, reducing contact resistance, enhancing heat dissipation, and increasing structural strength. By adopting this advanced top cover assembly, the negative electrode top cover assembly 400 can provide strong support for improving battery performance and ensuring safety.

[0087] In summary, the battery provided in this embodiment of the invention achieves efficient energy storage and stable power output through the coordinated operation of the casing 100, bare cell 200, positive electrode top cover assembly 300, and negative electrode top cover assembly 400. The meticulous design and optimized combination of each component enables the battery to achieve a high level of performance, safety, and reliability, and it has broad market application prospects.

[0088] Please refer to Figure 6-9 In one embodiment of this invention, the positive electrode top cover assembly 300 includes a positive electrode cover plate 3001 and a positive electrode post;

[0089] The positive electrode cover plate 3001, as the basic load-bearing structure of the positive electrode top cover assembly 300, has a specific shape and size to adapt to the overall design requirements of the battery. Positive electrode post holes are precisely provided on the positive electrode cover plate 3001, providing a reliable guarantee for the stable installation of the positive electrode post.

[0090] The positive terminal is the core component of the positive terminal top cover assembly 300, enabling electrical connection. It includes the positive terminal body 3002. The positive terminal body 3002 is made of a metallic material with good conductivity and mechanical properties, such as copper alloy, to meet the requirements of current conduction and structural strength during battery charging and discharging. The positive terminal body 3002 is installed in the positive terminal hole by through-hole insertion. During installation, specific processes and tooling fixtures are used to ensure a uniform and tight fit between the positive terminal body 3002 and the positive terminal hole, preventing loosening or leakage, and ensuring the battery's sealing performance and electrical connection reliability.

[0091] Furthermore, the positive electrode post body 3002 has undergone innovative optimization in structural design, with a groove 3003 formed by the indentation from the lower surface to the upper surface.

[0092] It is worth noting that the innovative design of the groove 3003 on the positive electrode post body 3002 has significant technical implications. In traditional battery designs, the connection between the positive electrode post and the positive electrode tab usually requires an adapter plate. In this embodiment of the invention, by providing the groove 3003 on the positive electrode post body 3002, the thickness of the positive electrode post body 3002 in the welding area is significantly reduced, thus cleverly meeting the stringent material thickness requirements of ultrasonic welding. In this way, the positive electrode post body 3002 no longer needs an adapter plate and can be directly welded to the positive electrode tab 500, achieving a direct connection.

[0093] This innovative design offers several significant advantages. First, it avoids the increased internal resistance caused by traditional adapter connections, effectively reducing the battery's internal resistance, minimizing energy loss during charging and discharging, and improving energy conversion efficiency. Second, it reduces battery temperature rise during operation, minimizing damage to battery materials and performance caused by high temperatures, thus significantly improving battery performance and lifespan. Third, it simplifies the battery assembly process, eliminating the adapter installation step, reducing the number of parts and steps involved in assembly, lowering manufacturing costs, and greatly improving production efficiency, providing strong support for large-scale industrial production.

[0094] In one embodiment of this invention, the structural design of the positive electrode post body 3002 has been carefully optimized to ensure that it can effectively achieve ultrasonic welding with the positive electrode tab 500 while meeting the overall performance requirements of the battery.

[0095] Specifically, the thickness of the groove 3003 on the second surface 3 of the positive electrode post body 3002 is precisely calculated and designed to meet the stringent material thickness requirements of the ultrasonic welding process. For example, the thickness at the groove 3003 can be set to 2mm. This thickness is not fixed but can be flexibly adjusted according to the actual size, capacity, and specific application of the battery. Meanwhile, the thickness at other locations of the positive electrode post body 3002 is relatively larger, typically between 5mm and 8mm. This thickness range can also be adjusted according to the actual needs of the battery to ensure that the post, while possessing sufficient mechanical strength and conductivity, meets the overall structural and performance requirements of the battery.

[0096] Through this unique structural design, the thickness of the positive electrode post 3002 at the groove 3003 position is significantly less than the thickness at other positions, thus creating a thickness difference in the welding area. This thickness difference design is crucial, as it not only ensures that the positive electrode post 3002 at the groove 3003 position meets the material thickness limitations for ultrasonic welding, guaranteeing the reliability and stability of the welding process, but also ensures the overall structural strength and conductivity of the post, avoiding problems such as decreased mechanical properties or insufficient conductivity caused by excessive thinning.

[0097] In summary, this embodiment cleverly balances the relationship between the requirements of ultrasonic welding process and the overall performance of the electrode by setting a groove 3003 of a specific thickness on the positive electrode body 3002, providing an innovative and practical solution for battery manufacturing technology.

[0098] In one embodiment of this invention, to further enhance the welding strength and reliability between the positive electrode tab 500 and the positive electrode post body 3002, the bottom of the groove 3003 is designed to have a plurality of protrusions 3004. The arrangement of these protrusions 3004 can significantly increase the welding contact area between the positive electrode tab 500 and the positive electrode post body 3002, thereby effectively improving welding strength and stability.

[0099] Specifically, these protrusions 3004 can form more contact points and welding areas with the surface of the positive electrode tab 500 during the welding process. By increasing these additional contact points, the ultrasonic energy can be more evenly distributed between the positive electrode tab 500 and the positive electrode post body 3002 during welding, thereby achieving a stronger welding effect.

[0100] Furthermore, the 3004 protrusion design improves energy transfer efficiency during the welding process. Effective energy transfer is crucial for forming high-quality weld joints in ultrasonic welding. The presence of the 3004 protrusion guides ultrasonic energy to act more concentratedly on the welding area, preventing excessive energy dispersion and thus improving welding efficiency and quality.

[0101] From a structural perspective, the design of the protrusion 3004 does not negatively impact the overall structural strength of the positive electrode post body 3002. On the contrary, by rationally designing the shape and distribution density of the protrusion 3004, welding performance can be significantly improved without weakening the strength of the positive electrode post body 3002. This design is not only suitable for manual welding operations but also adapts well to automated welding production lines, improving production efficiency and the consistency of welding quality.

[0102] In summary, in this embodiment, the bottom of the groove 3003 is provided with several protrusions 3004. This innovative design significantly improves the strength and reliability of the weld by increasing the welding area between the positive electrode tab 500 and the positive electrode post body 3002. At the same time, the design of the protrusions 3004 also optimizes the energy transfer efficiency during the welding process and improves the welding quality.

[0103] Finally, it should be noted that although the above embodiments have been described in the description and drawings of this invention, this should not limit the scope of patent protection of this invention. Any technical solutions that are based on the essential concept of this invention, utilize the content described in the description and drawings of this invention to make equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this invention.

Claims

1. A top cover assembly, characterized in that, Includes a top cover (1) and an insulating plastic frame (2), wherein, The top cover plate (1) is recessed from the lower surface to the upper surface to form a receiving groove (3) for accommodating the electrode tab; The insulating plastic frame (2) is located on the lower surface of the top cover plate (1) and is adapted to the shape of the top cover plate (1); The insulating plastic frame (2) has a through hole (4) through which the electrode tab can pass and be electrically connected to the bottom of the receiving groove (3).

2. The top cover assembly according to claim 1, characterized in that, The thickness of the bottom of the receiving groove (3) at the position corresponding to the through hole (4) is less than the thickness at other positions.

3. The top cover assembly according to claim 1, characterized in that, At least one of the receiving grooves (3) has its groove wall set at an angle.

4. The top cover assembly according to claim 1, characterized in that, The through hole (4) is rectangular.

5. The top cover assembly according to claim 1, characterized in that, The top cover (1) is made of aluminum sheet by stamping.

6. A battery, characterized in that, It includes a housing (100), a bare cell (200), a positive electrode top cover assembly (300), and a negative electrode top cover assembly (400); among which, The negative electrode top cover assembly (400) is the top cover assembly as described in any one of claims 1-4; The bare battery cell (200) has a positive electrode tab (500) and a negative electrode tab (600). The housing (100) has a space for accommodating the bare battery cell (200); The positive electrode top cover assembly (300) covers one of the openings of the housing (100); The negative electrode top cover assembly (400) covers another opening in the housing (100).

7. The battery according to claim 6, characterized in that, The positive electrode top cover assembly (300) includes a positive electrode cover plate (3001) and a positive electrode post; The positive electrode cover plate (3001) is provided with a positive electrode post hole; The positive electrode post includes a positive electrode post body (3002); the positive electrode post body (3002) is inserted through the positive electrode post hole; The positive electrode post body (3002) has a groove (3003) formed by recessing from the lower surface to the upper surface. The bottom of the groove (3003) is used to make an electrical connection with the positive electrode tab (500) by ultrasonic welding.

8. The battery according to claim 7, characterized in that, In the positive electrode post body, the thickness at the groove (3003) position is less than the thickness at other positions.

9. The battery according to claim 7, characterized in that, The bottom of the groove (3003) is provided with several protrusions (3004).

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