A large capacity battery cover plate assembly and a square battery

Abstract

The utility model relates to battery technical field, propose a kind of large capacity battery cover plate assembly and square battery, large capacity battery cover plate assembly includes top cover, insulating part and electric connecting piece. Top cover is equipped with at least one same polarity pole, insulating part is located in top cover bottom surface, electric connecting piece is located below insulating part, including connecting piece and the plurality of interval arrangement welding portion that it protrudes downward from. Pole passes through insulating part and is electrically connected with connecting piece, each welding portion is used for welding with the pole lug of the multiple roll core of laminated arrangement respectively. Square battery includes shell, laminated roll core and above-mentioned cover plate assembly, roll core pole lug and welding portion are one-to-one corresponding welding, top cover is sealingly connected with shell. The utility model converts complex internal welding into standardization interface by integrated electric connecting piece and its prefabricated welding portion, simplifies assembly, saves space, improves connection reliability and battery energy density.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a high-capacity battery cover assembly and a square battery. Background Technology

[0002] Currently, the energy storage industry is in a phase of rapid development, with energy storage projects rapidly advancing towards the GWh era. This places stringent demands on energy storage systems and their core component—battery cells, which account for approximately 60% of the cost—in terms of larger capacity, higher safety, and longer cycle life. To cope with increasingly fierce market competition, battery companies have launched large-capacity energy storage cells with capacities exceeding 310Ah.

[0003] In related technologies, multiple cores are typically stacked along the thickness direction within a square battery casing to increase cell capacity. However, as the number of cores increases, the cover plate and connection structure in existing technologies face significant challenges. Currently, most existing technologies employ a dual-parallel core-pack structure, where two core packs are connected by welding the same polarity tabs on both sides using a connecting piece. However, when the number of cores increases further, such as when multiple cores (three or more) are stacked, the limitations of this connection method become apparent: the core in the middle position, with its tabs obscured by the tabs of the cores on both sides, is difficult to reliably and conveniently weld and assemble with traditional planar connecting pieces. Furthermore, even if connection can be achieved, the increased number of tabs inevitably leads to an increase in the overall length of the tab bundle and a significant increase in the thickness after folding. This not only occupies valuable internal space within the cell and limits the effective utilization of the core volume, but may also affect the battery's safety performance and cycle life due to increased connection complexity and internal resistance, ultimately restricting the improvement of energy density and reliability of high-capacity square batteries. Utility Model Content

[0004] In view of this, the present invention proposes a high-capacity battery cover assembly and a square battery, aiming to solve the technical problem that when multiple cores are stacked in the thickness direction, it is difficult for the tabs of the middle core to achieve a reliable electrical connection with the cover assembly.

[0005] The technical solution of this utility model is implemented as follows: On the one hand, this utility model provides a high-capacity battery cover assembly, including: The top cover has at least one pole of the same polarity. Insulating components are installed on the bottom surface of the top cover; An electrical connector is disposed on the side of the insulating member away from the top cover. The electrical connector includes a connecting piece and a plurality of welded portions protruding downward from the connecting piece. The plurality of welded portions are arranged at intervals along the length direction of the connecting piece. The pole passes through the insulating member and is electrically connected to the connecting piece. The plurality of welded portions are respectively used to weld to the corresponding tabs on a plurality of stacked cores.

[0006] Based on the above technical solution, preferably, the welding part is a strip-shaped protrusion protruding downward from the bottom surface of the connecting piece, and the side surface of the strip-shaped protrusion constitutes a welding surface for welding with the electrode tab.

[0007] Based on the above technical solution, preferably, the extending direction of the strip protrusion is perpendicular to the length direction of the connecting piece.

[0008] Based on the above technical solution, preferably, the insulating component includes a plate-shaped first insulating part and a cylindrical second insulating part; the first insulating part is fixed to the bottom surface of the top cover; the top cover has a mounting hole for the pole post to pass through; the second insulating part is fixedly fitted with the inner wall of the mounting hole and the outer wall of the pole post, and is integrally connected with the first insulating part, thereby forming an insulating isolation between the pole post and the top cover.

[0009] Based on the above technical solution, preferably, the electrical connector, the pole, the insulating component and the top cover are fixedly connected as a whole by an integral injection molding process.

[0010] Based on the above technical solution, preferably, the number of poles of the same polarity provided on the top cover is multiple, and the insulating component also includes a plate-shaped third insulating part, which is located on the top surface of the top cover and is integrally connected to the first insulating part and the second insulating part through the portion extending upward from the second insulating part. It also includes a guide plate, which is located on the top surface of the third insulating part and is fixedly connected to the top of all poles of the same polarity.

[0011] Based on the above technical solution, preferably, the top surface of the top cover is recessed to form a receiving groove, and the third insulating part is embedded and fixed in the receiving groove.

[0012] Based on the above technical solution, preferably, the electrical connector, the pole, the insulating component, the top cover, and the guide plate are fixedly connected as a whole through an integrated injection molding process.

[0013] Based on the above technical solution, preferably, the top cover is provided with an explosion-proof valve, which is a one-way valve structure.

[0014] Secondly, this utility model discloses a square battery, including a housing, a plurality of stacked cores disposed within the housing, and a high-capacity battery cover assembly as described in the first aspect. The number of cores is equal to the number of welded portions on the electrical connectors. Each core's tab is welded to a corresponding welded portion. The top cover and the housing opening are fixedly connected.

[0015] The present invention has the following advantages over the prior art: (1) By adopting an integrated electrical connector with multiple downwardly protruding and spaced welding parts, the complex tab folding and welding operations that need to be performed inside the battery in the traditional solution are transformed into a standardized welding interface pre-integrated with the cover plate assembly. This structure greatly simplifies the battery assembly process, significantly reduces the internal space wasted due to excessively long tabs and excessive folding thickness, and ensures that each core tab can obtain reliable and consistent electrical connection quality, effectively improving the energy density and manufacturing reliability of square batteries.

[0016] (2) The strip-shaped raised side surface forms the welding surface for welding with the electrode lug. This design changes the welding surface from the bottom surface that traditionally contacts the end face of the connecting piece and the electrode lug to the side surface of the strip-shaped raised surface, thus changing the geometric direction of the welding operation. The design of the welding surface being located on the side surface allows the electrode lug of the core to be lapped and welded to the welding part from the side. This lateral welding method provides more operating space for welding tools (such as welding guns) and reduces the difficulty of welding.

[0017] (3) By employing a multi-terminal plate and a current guide plate, the current guide plate establishes an electrical connection through the multi-terminal plate and electrical connectors. The current guide plate physically and electrically connects all terminals of the same polarity in parallel to form a unified current output terminal. Its large surface area and conductive cross-section allow the current to be efficiently collected from the top of each terminal and evenly distributed within the current guide plate, avoiding current concentration on a certain part of the terminals. This achieves balanced current conduction, further optimizes the electrical connection performance, and ensures the overall stability of the battery operation.

[0018] (4) The square battery provided in this embodiment, by adopting an integrated cover plate assembly with pre-made welded parts and making the number of welded parts correspond precisely to the number of cores, successfully solves the technical problem of complex internal connection and low space utilization of multi-core large-capacity batteries, and obtains a large-capacity square battery with compact structure, reliable connection, high safety and easy production. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a first-view perspective three-dimensional structural diagram of the large-capacity battery cover assembly disclosed in an embodiment of the present utility model. Figure 2 This is a second-view perspective three-dimensional structural diagram of the large-capacity battery cover assembly disclosed in an embodiment of the present utility model. Figure 3 This is an exploded view of the high-capacity battery cover assembly disclosed in an embodiment of the present utility model; Figure 4 This is a top view of the high-capacity battery cover assembly disclosed in an embodiment of the present utility model; Figure 5 for Figure 4 Planar sectional view at point AA; Figure 6 This is a three-dimensional structural diagram of the square battery disclosed in an embodiment of the present utility model; Figure label: 1. Top cover; 2. Pole post; 3. Insulating component; 4. Electrical connector; 41. Connecting piece; 42. Welding part; 31. First insulating part; 32. Second insulating part; 33. Third insulating part; 11. Mounting hole; 5. Guide plate; 12. Receiving groove; 6. Explosion-proof valve; 7. Housing; 8. Core; 81. Pole lug. Detailed Implementation

[0021] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0024] In the description of the embodiments of this utility model, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0027] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0028] like Figure 1 As shown, combined with Figure 2-5The first embodiment of this utility model discloses a high-capacity battery cover assembly, including a top cover 1, an insulating component 3, and an electrical connector 4.

[0029] As the basic structural component of the entire assembly, the top cover 1's primary function is to seal the opening of the battery casing 7, providing a mounting base for other functional components. In this embodiment, the top cover 1 is made of metal, preferably aluminum, and has at least one same-polarity terminal 2. The terminal 2 is a key channel for electrical connection between the battery's internal and external circuits.

[0030] An implementation scheme that provides one or more poles 2 of the same polarity on a cover plate assembly can reduce current conduction resistance and optimize current distribution.

[0031] An insulating component 3 is disposed on the bottom surface of the top cover 1. This insulating component 3 is made of insulating materials such as engineering plastics. Its function is to achieve electrical isolation between the top cover 1 and the live components inside the battery, preventing short circuits between the terminal post 2 and the metal top cover 1, and ensuring the safe and reliable use of the battery. The insulating component 3 is firmly fixed to the side of the top cover 1 facing the inside of the battery, forming an insulating barrier that is in direct contact with the internal environment of the battery.

[0032] Electrical connector 4 is located on the side of insulating member 3 away from top cover 1. This electrical connector 4 is the core conductor realizing the internal electrical functions of the battery. Electrical connector 4 includes a sheet-like connecting piece 41 and multiple welded portions 42. The connecting piece 41, as the main body for current collection and distribution, is located below insulating member 3. The multiple welded portions 42 are structures that protrude downwards from the bottom surface of the connecting piece 41. This downward protrusion design allows the welded portions 42 to actively extend towards the core 8 inside the battery. The multiple welded portions 42 are arranged at intervals along the length direction of the connecting piece 41, an arrangement that allows their spatial position to precisely correspond to the positions of the tabs 81 of the multiple cores 8 stacked along the thickness direction inside the battery casing 7.

[0033] The pole post 2 passes through a pre-set hole or structure on the insulating component 3 and is electrically connected to the connecting piece 41. This connection can be achieved by welding, riveting, or other methods, ensuring that current can be efficiently conducted from the connecting piece 41 to the pole post 2. Multiple welding parts 42 are used to weld corresponding tabs 81 on multiple stacked cores 8. The downward protruding shape of the welding parts 42 allows each welding part 42 to directly and conveniently abut or approach the tab 81 of the corresponding core 8, thus solving the process problem that when multiple cores 8 are stacked, the tab 81 of the middle core 8 is blocked and difficult to weld to the planar connecting piece 41.

[0034] This embodiment utilizes an integrated electrical connector 4 with multiple downwardly protruding and spaced welding portions 42 to transform the complex folding and welding operations of the tabs 81, which are traditionally performed inside the battery, into a standardized welding interface pre-integrated with the cover plate assembly. This structure greatly simplifies the battery assembly process, significantly reduces the internal space wasted due to excessively long tabs 81 and excessive folding thickness, and ensures that each core 8 tab 81 achieves reliable and consistent electrical connection quality, ultimately effectively improving the energy density and manufacturing reliability of the square battery.

[0035] In some embodiments, the weld portion 42 is a strip-shaped protrusion protruding downward from the bottom surface of the connecting piece 41. The shape of the strip-shaped protrusion provides an extended linear structure, creating a larger contact area for electrical connection.

[0036] The side face of the strip-shaped protrusion forms a welding surface for welding with the tab 81. This design changes the welding surface from the bottom surface where the traditional connecting piece 41 contacts the end face of the tab 81 to the side face of the strip-shaped protrusion, altering the geometry of the welding operation. The design of the welding surface on the side face allows the tab 81 of the core 8 to be lap-welded to the welding part 42 from the side. This lateral welding method provides more operating space for welding tools (such as welding torches) and reduces the difficulty of welding.

[0037] Specifically, in the actual welding process, the entire battery cover assembly can be vertically fixed, i.e., vertically set along the length of the top cover 1. The welding operation starts from the bottom of the battery cover assembly and proceeds sequentially from bottom to top. First, the bottommost core 8 is placed horizontally, so that its tab 81 is horizontally overlapped with the side surface of the welding part 42 at the corresponding height and welded. Then, a second core 8 is stacked on top of this core 8, and its tab 81 is similarly horizontally overlapped with the side surface of the welding part 42 at a higher position and welded. In this order, the welding assembly of all stacked cores 8 can be completed one by one in the vertical direction. This operation sequence and lateral welding method ensure that each welding action is carried out in an open horizontal radial space, allowing the welding tool to approach the welding surface without obstruction, effectively avoiding interference from the narrow space between the tabs 81 stacked in the vertical direction.

[0038] In some embodiments, the extension direction of the strip protrusion is perpendicular to the length direction of the connecting piece 41.

[0039] Specifically, the length direction of the entire connecting piece 41 is consistent with the arrangement direction of the stacked cores 8. The tabs 81 on the core 8 extend horizontally from the end of the core 8. Due to the transverse arrangement of the strip protrusions, their side faces exactly towards the end of the core 8. This directional arrangement allows the horizontally extending tabs 81 to naturally and linearly adhere directly to the entire side face of the strip protrusions, achieving a large-area stable contact between the tabs 81 and the welding surface.

[0040] This vertical orientation not only optimizes the connection between the electrode tab 81 and the welding part 42, but also facilitates the welding process. The welding torch can apply welding force in a vertical direction, that is, parallel to the extension direction of the strip protrusion and perpendicular to the plane of the electrode tab 81. Since the welding surface is a continuous vertical plane, the welding torch can move along this plane, thereby applying uniform welding pressure or energy to the entire contact area between the electrode tab 81 and the strip protrusion, effectively ensuring the uniformity and consistency of the weld and avoiding localized incomplete welding or over-welding.

[0041] In some embodiments, the insulating member 3 is specifically designed to include a plate-shaped first insulating portion 31 and a cylindrical second insulating portion 32. The first insulating portion 31 serves as the main support structure of the insulating member 3, and its plate-shaped form allows it to cover a large area of ​​the bottom surface of the top cover 1. The first insulating portion 31 is firmly fixed to the bottom surface of the top cover 1, thereby establishing a primary insulating barrier between the top cover 1 and other components inside the battery.

[0042] The top cover 1 has a mounting hole 11 through which the electrode post 2 passes. This mounting hole 11 is the channel through which the electrode post 2 passes through the top cover 1 to achieve internal and external electrical connection. The cylindrical second insulating part 32 is a key component of the insulating member 3. The second insulating part 32 forms a fixed fit with the inner wall of the mounting hole 11 and the outer wall of the electrode post 2 passing through the hole. This fixed fit allows the second insulating part 32 to tightly fill the annular gap between the electrode post 2 and the wall of the mounting hole 11 of the top cover 1, which is achieved by interference fit, bonding or heat fusion.

[0043] The second insulating part 32 is integrally connected to the plate-shaped first insulating part 31. This integral connection means that the first insulating part 31 and the second insulating part 32 are a continuous, seamless integral structure, which is manufactured in one step by the same insulating material through processes such as injection molding.

[0044] Through the aforementioned structure, the cylindrical second insulator effectively encloses the portion of the terminal post 2 that passes through the top cover 1, blocking any possible direct contact path between the terminal post 2 and the metal top cover 1. The plate-shaped first insulating portion 31 isolates the electrical connection between the top cover 1 and the lower electrical connector 4. The integrated design of the first insulating portion 31 and the second insulating portion 32 allows the insulating component 3 to be installed as a single unit, simplifying the assembly process. More importantly, this structure greatly enhances the sealing performance and insulation reliability at the terminal post 2, effectively preventing electrolyte vapor from seeping or accumulating along the gap between the terminal post 2 and the mounting hole 11, thereby forming a durable and reliable insulating barrier between the terminal post 2 and the top cover 1, improving the safety of the battery during long-term use.

[0045] In some embodiments, the electrical connector 4, the pole 2, the insulator 3, and the top cover 1 are fixedly connected as a whole by an integral injection molding process. This process first places the pre-fabricated metal components, namely the top cover 1, the pole 2, and the connecting piece 41 (which has a downwardly protruding welding portion 42) serving as the electrical connector 4, into a precision mold in a predetermined relative position. Before placing them into the mold, the pole 2 and the connecting piece 41 can be welded together to form a whole. Subsequently, molten insulating material, typically high-performance engineering plastics such as PPS (polyphenylene sulfide) or PP (polypropylene), is injected into the mold cavity. The molten plastic fills the space between the top cover 1, the pole 2, and the electrical connector 4 that requires insulation and fixation, particularly precisely wrapping between the inner wall of the mounting hole 11 of the top cover 1 and the outer wall of the pole 2, forming a cylindrical second insulating portion 32. Simultaneously, a plate-shaped first insulating portion 31 is formed on the bottom surface of the top cover 1.

[0046] After the molten plastic cools and solidifies, the insulating material generates a strong enveloping and bonding force with the metal components, thus firmly binding the top cover 1, the pole 2, and the electrical connector 4 together into an integral module that cannot be easily separated through the insulating component 3. This manufacturing method allows the first insulating part 31 and the second insulating part 32 to be naturally integrated, and the insulating component 3 can be fixed and insulated from the top cover 1, the pole 2, and the electrical connector 4 without additional fasteners or assembly steps.

[0047] The one-piece injection molding process fundamentally changes the traditional production model of assembling multiple independent parts one by one for cover plate components. It integrates multiple scattered assembly steps into a single molding operation, greatly simplifying the production process and improving production efficiency and product consistency. Because the insulating material is filled and solidified in a molten state, it can perfectly conform to the complex contours of all metal parts, forming a fully enclosed insulating seal between the pole 2 and the top cover 1, and between the electrical connector 4 and the top cover 1. This effectively eliminates the risk of electrolyte leakage from interface gaps and significantly improves the sealing reliability and insulation safety of the product.

[0048] In some embodiments, the number of the same polarity terminals 2 disposed on the top cover 1 is multiple. Distributing multiple same polarity terminals 2 means that current can be drawn out in parallel through different paths from inside the battery, with the direct advantage of significantly increasing the total cross-sectional area for current conduction. This design effectively distributes the current load flowing through a single terminal 2, thereby significantly reducing the resistance of the entire path, reducing heat generation, and meeting the stringent requirements for low internal resistance during high-rate charging and discharging of large-capacity batteries.

[0049] The insulating component 3 further includes a plate-shaped third insulating part 33 in addition to the original structure. The main purpose of setting the third insulating part 33 is to establish a reliable insulating layer on the top surface of the top cover 1, thereby completely isolating the subsequently installed guide plate 5, which is connected to multiple poles 2 of the same polarity, from the metal top cover 1 itself, preventing short circuits. This third insulating part 33 is located on the top surface of the top cover 1, covering the upper surface of the top cover 1. The third insulating part 33 is integrally connected to the first insulating part 31 located on the bottom surface of the top cover 1 and the second insulating part 32 that wraps around the poles 2 through the upward extension of the second insulating part 32. This means that the first insulating part 31, the second insulating part 32 and the third insulating part 33 together form a continuous and complete integrated insulating frame that runs from below the top cover 1, through the mounting hole 11 and above the top cover 1. This frame completely wraps the metal part of the top cover 1, achieving all-round, dead-angle-free insulation isolation between the poles 2 and the top cover 1, greatly enhancing the electrical safety and short-circuit protection capability of the top structure.

[0050] It also includes a current guide plate 5, which is located on the top surface of the third insulating part 33. The current guide plate 5 is made of a highly conductive metal material, and its key function is to achieve a fixed connection (e.g., by welding) with the tops of all the same polarity terminals 2. The current guide plate 5 physically and electrically connects all the same polarity terminals 2 in parallel to form a unified current output terminal. Its large surface area and conductive cross-section allow the current to be efficiently collected from the tops of each terminal 2 and evenly distributed within the current guide plate 5, avoiding current concentration on a certain part of the terminals 2, thereby achieving balanced current conduction, further optimizing electrical connection performance, and ensuring the overall stability of the battery operation.

[0051] By employing a multi-pole post 2 design to reduce resistance, and introducing a top third insulation part 33 integrally formed with the bottom insulation frame to achieve insulation between the current guide plate 5 and the top cover 1, coupled with the current guide plate 5 to achieve current balancing, a top cover 1 system with strong current carrying capacity, uniform current distribution, and high insulation safety level is constructed. This solution not only solves the problems of heat generation and short-circuit risk under high current, but also significantly improves the integration, reliability, and overall performance of the cover assembly through the integrated insulation and current guiding structure.

[0052] In some embodiments, a receiving groove 12 is recessed in the top surface of the top cover 1, and the third insulating portion 33 is embedded and fixed within the receiving groove 12. This arrangement ensures that the upper surface of the third insulating portion 33 is at the same height as or only slightly higher than the non-recessed area of ​​the top surface of the top cover 1. This embedded installation method avoids the third insulating portion 33 protruding as a separate additional component from the top surface of the top cover 1, thereby significantly reducing the overall size of the cover assembly in the height direction. This vertical space saving helps to improve the volumetric energy density of the battery.

[0053] In some embodiments, the electrical connector 4, the electrode post 2, the insulating component 3, the top cover 1, and the guide plate 5 are fixedly connected as a whole by an integral injection molding process. This process is an extension based on the aforementioned embodiments, integrating the top conductive component, the guide plate 5, into the overall molding process.

[0054] Specifically, in the actual manufacturing process, the top of the pole 2 and the guide plate 5 can be welded together first. At this time, the guide plate 5, pole 2, and electrical connector 4 form a whole, which is then placed into the mold for injection molding. This allows the insulating part 3 to not only insulate and fix the top cover 1, pole 2, and electrical connector 4, but also to firmly connect the guide plate 5 to the top cover 1 and the top of the pole 2 and achieve electrical connection. The one-time molding process realizes the integrated insulation and mechanical fixation of the entire process from the bottom electrical connector 4 to the top guide plate 5.

[0055] In some embodiments, an explosion-proof valve 6 is provided on the top cover 1, and the explosion-proof valve 6 is a one-way valve structure. The one-way valve structure is opened when the internal pressure exceeds a set threshold, allowing gas to be discharged in one direction. When the internal pressure drops to a safe range, the valve can automatically close or maintain a state that restricts the reverse flow of gas. This one-way flow characteristic has an important advantage: it can prevent external air, moisture, and other impurities from flowing back into the battery while continuously depressurizing. Preventing external substances from entering can avoid contamination of the battery's internal chemical system or causing secondary adverse reactions, providing an extra layer of protection for the battery system after depressurization.

[0056] By incorporating an explosion-proof valve 6 with a particularly distinctive one-way valve structure on the top cover 1, active and controllable pressure management capabilities are added to the high-capacity battery cover assembly. This design not only provides reliable pressure relief to prevent explosions but also enhances the battery's safety and environmental isolation after pressure relief through its one-way characteristic, further ensuring the battery's safety throughout its entire lifecycle.

[0057] The second embodiment of this utility model also discloses a square battery, as shown in the attached drawing. Figure 6As shown, the battery includes a housing 7, a plurality of stacked cores 8 disposed within the housing 7, and a cover assembly. The cover assembly is the high-capacity battery cover assembly disclosed in the first embodiment.

[0058] The casing 7 provides a sealed housing space for the battery, and multiple winding cores 8 are stacked in this space along the thickness direction to achieve a large capacity design.

[0059] The number of cores 8 is equal to the number of welded portions 42 on the electrical connectors 4 in the cover plate assembly. This one-to-one correspondence ensures that each stacked core 8 has a dedicated welded interface pre-set on the electrical connector 4. The tab 81 of each core 8 is welded to a corresponding welded portion 42. This connection method allows the electrical energy of each core 8 to be independently and parallelly exported or imported through its tab 81, welded portion 42, electrical connector 4, and pole 2, achieving efficient parallel connection of multiple cores 8.

[0060] The top cover 1 and the opening of the housing 7 are fixedly connected by laser welding and other processes, thereby sealing multiple coil cores 8 inside the housing 7 to form a complete battery structure. By adopting the above-mentioned high-capacity battery cover assembly, the square battery can be assembled without the need for complex folding of the tabs 81 and alignment welding of multiple connecting pieces 41 within the narrow housing 7. Instead, the tabs 81 of the coil cores 8 can be directly butt-welded to the pre-fabricated welding parts 42 on the cover assembly, greatly simplifying the assembly process. At the same time, the integrated electrical connector 4 and the downwardly protruding welding part 42 structure save internal height space in the battery, allowing the coil cores 8 to occupy a larger volume, thereby increasing the energy density of the battery. In addition, the excellent insulation and explosion-proof safety characteristics of the cover assembly also directly improve the overall safety and reliability of the square battery.

[0061] The square battery provided in this embodiment, by adopting an integrated cover plate assembly with prefabricated welded parts 42 and ensuring that the number of welded parts 42 precisely corresponds to the number of cores 8, successfully solves the technical problem of complex internal connection and low space utilization in multi-core 8 large-capacity batteries, and obtains a large-capacity square battery with compact structure, reliable connection, high safety and easy production.

[0062] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A high-capacity battery cover assembly, characterized in that, include: Top cover (1), at least one pole post (2) of the same polarity is provided on the top cover (1); An insulating component (3) is disposed on the bottom surface of the top cover (1); An electrical connector (4) is disposed on the side of the insulating member (3) away from the top cover (1). The electrical connector (4) includes a connecting piece (41) and a plurality of welding parts (42) protruding downward from the connecting piece (41). The plurality of welding parts (42) are arranged at intervals along the length direction of the connecting piece (41). The pole post (2) passes through the insulating member (3) and is electrically connected to the connecting piece (41). The plurality of welding parts (42) are respectively used to weld to the corresponding tabs (81) on the plurality of stacked cores (8).

2. The high-capacity battery cover assembly as described in claim 1, characterized in that: The welding part (42) is a strip-shaped protrusion protruding downward from the bottom surface of the connecting piece (41), and the side surface of the strip-shaped protrusion forms a welding surface for welding with the electrode tab (81).

3. The high-capacity battery cover assembly as described in claim 2, characterized in that: The extension direction of the strip protrusion is perpendicular to the length direction of the connecting piece (41).

4. The high-capacity battery cover assembly as described in claim 1, characterized in that: The insulating component (3) includes a plate-shaped first insulating part (31) and a cylindrical second insulating part (32); the first insulating part (31) is fixed to the bottom surface of the top cover (1); the top cover (1) has an installation hole (11) for the pole post (2) to pass through; the second insulating part (32) is fixedly fitted with the inner wall of the installation hole (11) and the outer wall of the pole post (2), and is integrally connected with the first insulating part (31), thereby forming an insulating isolation between the pole post (2) and the top cover (1).

5. The high-capacity battery cover assembly as described in claim 4, characterized in that: The electrical connector (4), the pole (2), the insulating component (3), and the top cover (1) are fixedly connected as a whole by an integral injection molding process.

6. The high-capacity battery cover assembly as described in claim 4, characterized in that: The top cover (1) has multiple poles (2) of the same polarity. The insulating component (3) also includes a plate-shaped third insulating part (33), which is located on the top surface of the top cover (1) and is integrally connected to the first insulating part (31) and the second insulating part (32) through the portion extending upward from the second insulating part (32). It also includes a guide plate (5), which is located on the top surface of the third insulating part (33) and is fixedly connected to the top of all poles (2) of the same polarity.

7. The high-capacity battery cover assembly as described in claim 6, characterized in that: The top surface of the top cover (1) is recessed to form a receiving groove (12), and the third insulating part (33) is embedded and fixed in the receiving groove (12).

8. The high-capacity battery cover assembly as described in claim 6 or 7, characterized in that: The electrical connector (4), the pole (2), the insulating component (3), the top cover (1), and the guide plate (5) are fixedly connected as a whole by an integrated injection molding process.

9. The high-capacity battery cover assembly as described in claim 1, characterized in that: An explosion-proof valve (6) is provided on the top cover (1), and the explosion-proof valve (6) is a one-way valve structure.

10. A square battery, comprising a housing (7), a plurality of stacked cores (8) disposed within the housing (7), and a high-capacity battery cover assembly as claimed in any one of claims 1 to 9, wherein the number of cores (8) is equal to the number of welded portions (42) on the electrical connector (4), and the tabs (81) of each core (8) are welded to a corresponding welded portion (42), and the top cover (1) and the open end of the housing (7) are fixedly connected.

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