Square aluminum shell battery and power-related equipment

Abstract

The utility model provides a square aluminum shell battery and electric equipment, and relates to the technical field of square batteries. The square aluminum shell battery comprises a cover plate, a square battery cell and a shell, the shell is provided with an upper opening; the square battery cell is arranged in the shell; the cover plate corresponds to the upper opening of the shell and can cover the upper opening of the shell; the square battery core comprises a roll core body; the roll core body is provided with a negative electrode end at the upper end and a positive electrode end at the lower end; the negative pole end is provided with a negative pole lug, and the positive pole end is provided with a positive pole full pole lug part. And by adopting the positive electrode full-tab design, the overcurrent area is enlarged, the charge-discharge efficiency and thermal management of the square battery are improved, the safety is enhanced, the cycle life is prolonged, and the square battery is particularly suitable for high-performance applications such as electric automobiles.

Description

Technical Field

[0001] This utility model relates to the field of square battery technology, and in particular to a square aluminum-cased battery and related electrical equipment. Background Technology

[0002] With the rapid development of the new energy industry, the demand for high-performance batteries in electric vehicles and energy storage systems is increasing. Prism cells, due to their structural stability and energy density advantages, are widely used in these fields. The design and manufacturing technologies of prism cells are constantly advancing to meet the increasingly stringent performance requirements.

[0003] Currently, the manufacturing process of square battery cells includes steps such as coating, rolling, die-cutting, slitting, and winding of positive and negative electrode sheets. After these processes are completed, the positive and negative electrodes are wound together on the same side to form tabs, creating a multi-layer tab battery cell.

[0004] Then, the multi-layered copper-aluminum tabs are fixed by ultrasonic welding and finally welded to the cover plate, completing the formation of the square aluminum-cased battery. However, existing technologies have some defects in the cell design and manufacturing process. First, the foil materials commonly used in the industry are 1013 micrometers thick for the positive electrode aluminum foil and 68 micrometers thick for the negative electrode copper foil, with tab dimensions typically around 3040 mm in length and 20 mm in height. In high-rate power batteries, this design often results in insufficient overcurrent capacity of the tabs, leading to a significant temperature rise in the positive electrode when the current is high, which in turn increases the number of internal side reactions and affects the battery's cycle life.

[0005] Secondly, existing electrode manufacturing technologies require a die-cutting process to ensure the alignment of the electrode sheets during winding. This process generates a large amount of scrap material, increasing material costs. Furthermore, if the metal dust generated during die-cutting is not strictly controlled, it may fall into the electrode material area, posing a short-circuit risk after subsequent assembly into battery cells and increasing the possibility of thermal runaway and fire during battery charging and discharging. In addition, the laser die-cutting machines used in the die-cutting process are expensive and require a large footprint, which also increases production costs.

[0006] In summary, existing square battery cells have problems in terms of tab design, material selection, and manufacturing process, which limit further improvement in battery performance and effective cost control. These problems urgently need to be solved through technological innovation. Utility Model Content

[0007] The purpose of this utility model is to provide a square aluminum-cased battery and electrical equipment. The square aluminum-cased battery adopts a positive electrode full tab design to expand the current flow area, improve the charging and discharging efficiency and thermal management of the square battery, enhance safety and cycle life, and is particularly suitable for high-performance applications such as electric vehicles.

[0008] This utility model provides a square aluminum-cased battery, comprising: a cover plate, a square battery cell, and a casing;

[0009] The housing has an upper opening; the square battery cell is disposed in the housing; the cover plate corresponds to the upper opening of the housing and can cover the upper opening of the housing;

[0010] The square battery cell includes a core body, which has a negative terminal at the upper end and a positive terminal at the lower end; the negative terminal has a negative tab, and the positive terminal has a positive tab.

[0011] In a preferred embodiment, the positive electrode lug is a boss structure based on the bottom end of the core body;

[0012] The boss structure is based on the fact that the extension direction of the core body is opposite to the extension direction of the negative electrode tab.

[0013] In a preferred embodiment, the size of the cross-section of the positive electrode ear corresponds to the size of the cross-section of the core body.

[0014] In a preferred embodiment, the positive polarity ear covers the bottom end of the core body.

[0015] In a preferred embodiment, the positive electrode omnipolar tab is an omnipolar tab platform structure covering the positive electrode end, formed by a flattening process from the omnipolar tab extension area extending from the bottom of the core body.

[0016] The positive electrode lug includes a lug body and a welding plane located at the bottom end of the lug body.

[0017] In a preferred embodiment, the housing includes an enclosing sidewall and a housing bottom disposed at the bottom end of the enclosing sidewall;

[0018] The surrounding sidewalls and the bottom of the shell together form an accommodating space with an upper opening for accommodating the square battery cell;

[0019] The bottom of the shell includes a bottom wall and welded protrusions at both ends of the bottom wall.

[0020] In a preferred embodiment, the bottom surface of the positive electrode ear is a rectangle with rounded corner areas at both ends;

[0021] The area of ​​the welding protrusion is not less than the area of ​​the rounded corner region, and it can contact and cover the rounded corner region at the corresponding position.

[0022] In a preferred embodiment, the height of the welding protrusion is no more than 1 mm.

[0023] In a preferred embodiment, the cover plate includes a cover plate body and a positive electrode post and a negative electrode post disposed on the cover plate body;

[0024] The bottom end of the negative electrode post is welded to the negative electrode lug of the core body to form an electrical connection;

[0025] The positive electrode post is electrically connected through the positive electrode lug of the cover plate body, the housing, and the core body.

[0026] In addition, this utility model also provides an electrical device, including a square aluminum-cased battery as described in any of the foregoing embodiments.

[0027] The square aluminum-cased battery provided by this invention adopts a positive electrode tab design, which significantly increases the current-carrying area of ​​the cell, effectively improving the charge and discharge performance of the square aluminum-cased battery, especially in applications requiring high-rate discharge, such as the rapid start-up and acceleration of electric vehicles. This design not only reduces the battery's internal resistance, minimizes energy loss during transmission, and improves energy conversion efficiency, but also helps to distribute the current more evenly, reducing local overheating and thus improving the battery's thermal management performance and cycle life. Furthermore, the optimized current distribution reduces the risk of local overheating and overcurrent, improving battery safety and reducing the possibility of thermal runaway and short circuits. Therefore, the positive electrode tab design is crucial for meeting high energy density requirements and improving the overall performance and reliability of the battery, helping it to better adapt to the needs of modern electric vehicles and other high-performance applications. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 A schematic diagram of the overall structure of the square aluminum-cased battery provided in this embodiment of the utility model;

[0030] Figure 2 A front view of the square aluminum-cased battery provided in an embodiment of this utility model;

[0031] Figure 3 An exploded schematic diagram of a square aluminum-cased battery provided for an embodiment of this utility model;

[0032] Figure 4 A schematic diagram of the overall structure of the square cell in the square aluminum-cased battery provided in this embodiment of the utility model;

[0033] Figure 5 A front view structural diagram of the square cell in a square aluminum-cased battery provided in an embodiment of this utility model;

[0034] Figure 6 A schematic diagram of the square battery cell in the square aluminum-cased battery provided in this embodiment of the present invention before the flattening process;

[0035] Figure 7 A cross-sectional structural diagram of the casing in a square aluminum-cased battery provided for an embodiment of this utility model;

[0036] Figure 8 This is a schematic diagram of the structure of the positive electrode lug in a square aluminum-cased battery provided in an embodiment of the present invention;

[0037] Figure 9 A schematic diagram showing the positional relationship and size comparison of the positive electrode tab and the welded protrusion in a square aluminum-cased battery provided for an embodiment of this utility model.

[0038] Icons: 100-Square aluminum-cased battery; 1-Cover plate; 11-Positive terminal; 12-Negative terminal; 2-Square cell; 21-Coil body; 22-Negative terminal; 23-Negative tab; 24-Positive terminal; 25-Positive tab portion; 251-Taper body; 252-Welding plane; 253-Rounded corner area; 26-Taper extension area; 3-Casing; 31-Top opening; 311-Surrounding side wall; 312-Casing bottom; 3121-Bottom wall; 3122-Welding protrusion. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0041] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0042] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0043] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0044] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0045] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0046] refer to Figure 1 This application provides a square aluminum-cased battery 100, including: a cover plate 1, a square battery cell 2 and a casing 3; the casing 3 has an upper opening 31; the square battery cell 2 is disposed in the casing 3; the cover plate 1 corresponds to the upper opening 31 of the casing 3 and can cover the upper opening 31 of the casing 3.

[0047] The square battery cell 2 includes a core body 21, which has an upper negative terminal 22 and a lower positive terminal 24; the negative terminal 22 has a negative electrode tab 23, and the upper positive terminal 24 has a positive electrode tab 25.

[0048] The square aluminum-cased battery 100 is a type of lithium-ion battery packaging. The battery casing is square or rectangular, such as... Figure 2 As shown. The size and shape of square batteries can be customized to suit different application scenarios.

[0049] In this embodiment of the application, reference is made to Figure 3 The square aluminum-cased battery 100 consists of three main parts, including a cover plate 1, a square cell 2, and a casing 3.

[0050] The casing 3 is the outer protective structure of the battery, designed with an upper opening 31 to accommodate the square battery cell 2 and allow the cover plate 1 to close it. The square battery cell 2 is placed inside the casing 3, aligned with the upper opening 31 of the casing 3, ensuring that the cell is stably positioned within the casing 3. The function of the cover plate 1 is to close the upper opening 31 of the casing 3, and together with the casing 3, form a complete battery package, protecting the battery cell and providing the necessary electrical connection.

[0051] The square battery cell 2 contains a wound core body 21, which has a negative terminal 22 at the upper end and a positive terminal 24 at the lower end. The negative terminal 22 is equipped with a negative tab 23, while the positive terminal 24 is equipped with a positive tab 25. This distinguishes the structure of the positive tab 25 and the negative tab 23 from that of conventional square battery cells, meaning they are not located at the same end of the cell. This design helps improve the battery's electrical performance and safety.

[0052] It's important to note that in the traditional manufacturing process of square aluminum-cased batteries, the die-cutting process for the tabs is a critical step. This process requires precisely cutting the positive and negative electrode sheets into incrementally spaced cuts to ensure proper alignment during winding. However, aside from the tabs, other foil areas are typically treated as scrap and discarded, increasing material costs and potentially wasting resources. Furthermore, if the metal dust generated during die-cutting is not effectively controlled, it can fall into the electrode material area and cause short circuits after battery assembly, increasing the risk of thermal runaway and fire during charging and discharging. In addition, the equipment used in the die-cutting process, such as laser die-cutting machines, is not only expensive but also occupies a significant amount of production space.

[0053] To address these issues, this technology employs an innovative design approach, combining the positive electrode tab 25 with the negative electrode tab 23. While maintaining the traditional design of the negative electrode tab 23, the positive electrode is designed as a full-tab structure. This design allows for the negative electrode tab 23 to be formed by cutting only one end, while the positive electrode is formed by winding it around the other side, significantly increasing the cell's current-carrying area by an estimated fourfold or more. This improvement not only reduces processing costs and material waste but also simplifies the production process, reducing equipment investment and space requirements. Furthermore, the reduction in die-cutting processes lowers the risk of metal dust generation, improving battery safety and reliability. This design is particularly suitable for applications with high requirements for battery charge-discharge performance, such as electric vehicles.

[0054] This design makes the battery structure compact and stable, while facilitating mass production and application. The cooperation between the cover plate 1 and the casing 3 enhances the battery's sealing and protection, while the tab design inside the cell optimizes the battery's electrical connection and performance.

[0055] refer to Figure 4 In some embodiments, the positive electrode tab 25 is a boss structure based on the bottom end of the core body 21; the extension direction of the boss structure is opposite to the extension direction of the negative electrode tab 23. A partially enlarged view of the boss structure can be found in [reference needed]. Figure 5 .

[0056] In the structure of the aforementioned square aluminum-cased battery 100, the positive electrode tab 25 is formed based on the boss structure at the bottom of the core body 21. This boss structure not only increases the current-carrying area of ​​the cell, but its extension direction is also opposite to the extension direction of the negative electrode tab 23.

[0057] In other embodiments, the size of the cross-section of the positive electrode lug 25 corresponds to the size of the cross-section of the core body 21.

[0058] As mentioned above, the cross-section of the positive electrode ear 25 can correspond to the cross-section of the core body 21, resulting in the two having the same size in terms of structure.

[0059] In some embodiments, the positive omnipolar tab 25 covers the bottom end of the core body 21.

[0060] As described above, the positive polarity ear 25 can completely cover the bottom end of the core body 21.

[0061] refer to Figure 6 In some embodiments, the positive electrode omnipolar tab 25 is an omnipolar tab platform structure covering the positive electrode end 24, formed by a flattening process from an omnipolar tab extension area 26 extending from the bottom of the core body 21. The positive electrode omnipolar tab 25 includes an omnipolar tab body 251 and a welding plane 252 disposed at the bottom end of the omnipolar tab body 251.

[0062] As mentioned above, the flattening process is an important step in battery manufacturing, especially in the production of lithium-ion batteries. This process mainly involves specific processing of the battery tabs to ensure that the tabs can make flat contact with the current collector or other structural components inside the battery, thereby improving the battery's electrical connection performance and overall reliability.

[0063] In the manufacturing process of lithium-ion batteries, the tabs are key components connecting the positive and negative electrodes to the external circuitry. The flattening process uses physical methods, such as rollers or pressure equipment, to flatten and shape the tabs. The purpose of this is to create a flat surface on the tabs, ensuring good electrical contact with structural components such as current collectors during subsequent welding or other connection processes.

[0064] The aforementioned "full tab extension area 26" refers to a portion of material extending from the bottom of the core body 21 of the square aluminum-cased battery 100, specifically used to form the positive electrode full tab portion 25. This extension area is processed into a full tab platform structure covering the positive electrode end 24 through a flattening process.

[0065] In this application, the flattening process is a manufacturing process that uses physical means, such as rolling or hammering, to flatten the metal material in the extended area, forming a flat full-tab platform. The full-tab platform structure consists of two parts: the full-tab body 251 and a welding plane 252 located at the bottom of the full-tab body 251. The full-tab body 251 is the main body of the flattened metal material, while the welding plane 252 is a relatively flat surface designed to facilitate welding with other battery structural components, such as the current collector. This design provides a larger contact area for the full-tab portion inside the battery, which is beneficial for improving the battery's electrical performance and thermal management efficiency.

[0066] Through this structural design, the positive electrode tab 25 can not only improve the battery's overcurrent capacity, but also reduce the overheating problem that may occur during high-current charging and discharging, thereby improving the battery's safety and reliability.

[0067] Furthermore, since the full tab extension area 26 is directly extended and processed from the bottom of the core body 21, this integrated design simplifies the battery manufacturing process, reduces material waste, and may lower production costs.

[0068] Furthermore, the extension length of the full-teg extension region 26 is no more than 10 mm.

[0069] In this technology, the design of the square aluminum-cased battery 100 introduces an innovative positive electrode tab 25 structure. This structure is formed through a specific flattening process, designed to optimize the battery's electrical performance and thermal management efficiency. The tab extension area 26 refers to a portion of material extending from the bottom of the core body 21, with its extension length controlled to no more than 10mm. Compared to the 30-40mm long tabs commonly used in the industry, this design significantly reduces material usage, thereby effectively lowering costs.

[0070] The flattened full-tab platform structure includes a full-tab body 251 and a welding plane 252 located at the bottom of the full-tab body 251. This structure is formed by flattening the full-tab extension area 26 extending from the bottom of the core body 21. This design not only simplifies the manufacturing process and reduces material waste, but also reduces the generation of metal dust during the cutting process due to the shorter extension length, thereby reducing the risk of internal short circuits and thermal runaway in the battery. Furthermore, the shorter full-tab extension area 26 helps improve the battery's electrical performance because it reduces the current conduction distance in the tab, thus lowering the battery's internal resistance. This is particularly important for high-rate power batteries, as they require high overcurrent capacity from the tabs during high-current charging and discharging. Through this design, even under high current conditions, the positive electrode temperature rise can be effectively controlled, reducing internal side reactions in the battery and thus extending the battery's lifespan. In summary, this technology, by optimizing the structure and flattening process of the positive electrode tab 25, not only improves the performance and safety of the battery but also reduces production costs, providing an effective improvement solution for the design of the square aluminum-cased battery 100.

[0071] refer to Figure 7 In some embodiments, the housing 3 includes an enclosing sidewall 311 and a housing bottom 312 disposed at the bottom end of the enclosing sidewall 311.

[0072] The surrounding sidewall 311 and the bottom of the shell 312 together form an accommodating space with an upper opening 31 for accommodating the square battery cell 2;

[0073] The bottom of the shell 312 includes a bottom wall 3121 and welding protrusions 3122 at both ends of the bottom wall 3121.

[0074] As described above, the housing 3 consists of a sidewall 311 surrounding the sidewalls and a bottom portion 312, which together form an accommodating space with an upper opening 31 for accommodating the square battery cell 2. The sidewalls surround the battery, providing structural support and protection to ensure the battery cell is securely positioned within the housing 3. The bottom portion 312 is located at the bottom of the sidewalls surrounding the sidewalls 311, forming a closed accommodating space together with the sidewalls. The design of the bottom portion 312 is crucial for the bottom protection and welding connection of the battery.

[0075] The bottom of the casing 312 includes a bottom wall 3121 and welding protrusions 3122 at both ends of the bottom wall 3121. The bottom wall 3121 is the main part of the bottom of the casing 312, providing support and protection for the bottom. The welding protrusions 3122 are special structures at both ends of the bottom wall 3121, with their protrusion direction facing the bottom of the square battery cell 2, for welding connection with the positive electrode lug 25 at the bottom of the battery cell.

[0076] The design of the welding protrusions 3122 makes the connection between the battery casing 3 and the cell more stable and reliable. These protrusions can form an electrical connection with the positive electrode tab 25 at the bottom of the cell by welding, ensuring effective current conduction.

[0077] Through the design of the bottom wall 3121 and the welding protrusion 3122, the casing 3 not only provides physical protection for the battery cell, but also enhances the overall structural stability of the battery through the welding protrusion 3122. This design simplifies the battery manufacturing and assembly process because the welding protrusion 3122 provides clearly defined welding positions, which helps to automate welding operations and improve production efficiency.

[0078] In summary, the special design of the casing 3 structure, through the bottom wall 3121 and the welding protrusion 3122, improves the structural stability and welding reliability of the square aluminum casing battery 100, and also provides better protection for the battery cells, which is crucial for the performance and safety of the battery.

[0079] refer to Figure 8 In some embodiments, the bottom surface of the positive electrode tab 25 is a rectangle with rounded corner regions 253 at both ends; the area of ​​the welding protrusion 3122 is not less than the area of ​​the rounded corner region 253, and it can contact and cover the rounded corner region 253 at the corresponding position. A comparison of the positional relationship and size of the welding protrusion 3122 and the rounded corner region 253 is provided for reference. Figure 9 .

[0080] The bottom surface of the positive electrode tab 25 is designed as a rectangle, with rounded corner areas 253 at both ends. This design helps improve the electrical connection performance of the battery, while also enhancing its mechanical stability.

[0081] The area of ​​the welding protrusion 3122 is designed to be no less than the area of ​​the rounded corner area 253 at both ends of the bottom surface of the positive electrode ear 25. This design ensures that the welding protrusion 3122 can fully contact and cover the rounded corner area 253 of the positive electrode ear 25.

[0082] By ensuring complete contact between the weld protrusion 3122 and all the rounded corner areas 253 of the positive electrode tab 25, welding reliability can be improved, ensuring stable electrical connections within the battery. Sufficient contact of the weld protrusion 3122 contributes to improved overall battery structural stability, reducing connection failures due to mechanical vibration or impact during battery use. The tab design increases the battery's current-carrying area, thereby improving thermal management efficiency and helping to control battery temperature during high-current charging and discharging. 4. Reduced material waste: Compared to the industry-standard longer tab design, this design reduces material usage, thus lowering costs. Because the area of ​​the weld protrusion 3122 matches the rounded corner areas 253 of the tab, this helps simplify the welding process and improve production efficiency.

[0083] Furthermore, the rounded corner region 253 is formed by processing the full tab extension region 26 through a flattening process. This process gives the rounded corner region 253 advantages in material density and hardness. Since the rounded corner region 253 is composed of tab material formed by winding, the rounded corner regions 253 at both ends have higher material density, greater quantity, and stronger hardness. This structural feature shows significant advantages during welding: the high density and high hardness of the rounded corner region 253 provide better welding stability, making it easier to form a complete bond during welding.

[0084] Furthermore, the larger contact area ensures a good welding effect, thereby improving the battery's electrical performance and overall reliability. The flattening process uses physical means such as rolling or hammering to flatten the originally upright tabs into a flat plane. During this process, the rounded corner area 253 exhibits higher structural integrity because it contains more tab material.

[0085] This design not only optimizes the current conduction path inside the battery but also helps improve the battery's thermal management efficiency. During high-rate charging and discharging, a good weld connection can reduce heat generated by resistance, thereby controlling the battery temperature and extending its lifespan. Therefore, the rounded corner area 253 formed by the flattening process plays a crucial role in enhancing welding stability and improving battery performance in the square aluminum-cased battery 100.

[0086] In some embodiments, the height of the welding protrusion 3122 is no more than 1 mm.

[0087] In some embodiments, the cover plate 1 includes a cover plate 1 body, a positive electrode post 11 and a negative electrode post 12 disposed on the cover plate 1 body;

[0088] The bottom end of the negative electrode post 12 is welded to the negative electrode lug 23 of the core body 21 to form an electrical connection;

[0089] The positive electrode post 11 is electrically connected through the positive electrode lug 25 of the cover plate 1 body, the housing 3 and the core body 21.

[0090] In the above structure, by integrating the positive electrode post 11 and the negative electrode post 12 onto the cover plate 1 and achieving a stable welding connection between them and the battery cell, the electrical performance and safety of the battery are significantly improved. The negative electrode post 12 is directly welded to the negative electrode tab 23 of the battery cell, ensuring a reliable connection of the negative electrode. The positive electrode post 11 is electrically connected through the cover plate 1 body, the housing 3, and the positive electrode tab 25 of the battery cell. This integrated connection method enhances the stability of the battery's internal structure and simplifies the internal connection design. This clear polarity connection helps ensure correct electrical connections during battery assembly and use, improves production efficiency, and increases the battery's energy conversion efficiency by reducing resistance. Overall, this cover plate 1 design not only enhances battery performance but also, due to its versatility and adaptability, can accommodate different models and sizes of square battery cells 2, facilitating the implementation of automated production lines and simplifying the battery assembly process.

[0091] Furthermore, conventional cover plates 1 typically have insulating sheets installed on both the positive and negative terminals 12 to ensure electrical safety, but this design is relatively complex and may increase cost and manufacturing difficulty. According to the provided information, the cover plate 1 of the square aluminum-cased battery 100 in this application includes a cover plate 1 body, and a positive terminal 11 and a negative terminal 12 disposed on the cover plate 1 body. The bottom end of the negative terminal 12 is welded to the negative electrode tab 23 of the core body 21 to form an electrical connection; while the positive terminal 11 is electrically connected through the cover plate 1 body, the casing 3, and the positive electrode tab 25 of the core body 21.

[0092] This design simplifies the structure of the cover plate 1, eliminating the need for insulating sheets on both the positive and negative terminals 12. Since the positive terminal lug 25 forms an integrated electrical connection with the cover plate 1, the housing 3, and the core body 21, this structure provides sufficient insulation and safety performance while reducing the use of insulating materials, lowering costs, and potentially improving production efficiency.

[0093] Furthermore, the simplified cover plate 1 design helps reduce the overall weight and complexity of the battery, which is beneficial for improving battery performance and reliability. In summary, the square aluminum-cased battery 100 of this application, through its innovative cover plate 1 design, avoids the complexity of traditional double-insulation designs while maintaining battery safety and reliability, providing a new solution for battery design.

[0094] In addition, this utility model also provides an electrical device, including a square aluminum-cased battery 100 as described in any of the foregoing embodiments.

[0095] The aforementioned square aluminum-cased battery 100, with its high energy density, safety, and reliability, is suitable for a variety of electrical devices, including electric vehicles, energy storage systems, portable electronic devices, power tools, electric bicycles, home energy management systems, industrial automation equipment, and aerospace equipment. These devices rely on high-performance batteries to provide stable and long-lasting power, and the square aluminum-cased battery 100 perfectly meets these needs, performing excellently in terms of power supply, energy storage, and portability, making it an ideal energy component for these fields.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model 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 or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A square aluminum-cased battery, characterized in that, include: Cover plate, square battery cell and casing; The housing has an upper opening; the square battery cell is disposed in the housing; the cover plate corresponds to the upper opening of the housing and can cover the upper opening of the housing; The square battery cell includes a core body, which has a negative terminal at the upper end and a positive terminal at the lower end; the negative terminal has a negative tab, and the positive terminal has a positive tab.

2. The square aluminum-cased battery as described in claim 1, characterized in that, The positive electrode ear is a boss structure based on the bottom end of the core body; The boss structure is based on the fact that the extension direction of the core body is opposite to the extension direction of the negative electrode tab.

3. The square aluminum-cased battery as described in claim 1, characterized in that, The size of the cross-section of the positive electrode ear corresponds to the size of the cross-section of the core body.

4. The square aluminum-cased battery as described in claim 1, characterized in that, The positive electrode ear covers the bottom end of the core body.

5. The square aluminum-cased battery as described in claim 1, characterized in that, The positive electrode omnipolar lug is an omnipolar lug platform structure covering the positive electrode end, formed by a flattening process from the omnipolar lug extension area extending from the bottom of the core body. The positive electrode lug includes a lug body and a welding plane located at the bottom end of the lug body.

6. The square aluminum-cased battery as described in claim 1, characterized in that, The housing includes an enclosing sidewall and a housing bottom located at the bottom end of the enclosing sidewall; The surrounding sidewalls and the bottom of the shell together form an accommodating space with an upper opening for accommodating the square battery cell; The bottom of the shell includes a bottom wall and welded protrusions at both ends of the bottom wall.

7. The square aluminum-cased battery as described in claim 6, characterized in that, The bottom surface of the positive electrode ear is a rectangle with rounded corner areas at both ends; The area of ​​the welding protrusion is not less than the area of ​​the rounded corner region, and it can contact and cover the rounded corner region at the corresponding position.

8. The square aluminum-cased battery as described in claim 7, characterized in that, The height of the weld protrusion is no more than 1 mm.

9. The square aluminum-cased battery as described in claim 1, characterized in that, The cover plate includes a cover plate body, and a positive terminal and a negative terminal are disposed on the cover plate body; The bottom end of the negative electrode post is welded to the negative electrode lug of the core body to form an electrical connection; The positive electrode post is electrically connected through the positive electrode lug of the cover plate body, the housing, and the core body.

10. An electrical-related device, characterized in that, Including the square aluminum-cased battery as described in any one of claims 1-9.

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