Lithium ion battery
By designing a folded cell structure and welding connecting tabs, the problem of difficult installation of lithium-ion battery tabs was solved, improving the battery's electrical connection performance and reliability, and extending the battery's lifespan and safety.
Patent Information
- Application Number
- CN202422973243.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-12-02
AI Technical Summary
When using negative electrode materials such as silicon-carbon and silicon-oxygen, which expand significantly, existing lithium-ion batteries face difficulties in installing the tabs. Furthermore, the tab plane of the longitudinally folded structure does not match the maximum area of the cell, leading to welding difficulties.
Design a lithium-ion battery with a folded cell structure. The first and second connecting parts of the folded cell are located on both sides of the length direction, respectively, to increase the electrode connection area. The positive and negative electrodes are connected by welding. The battery is protected and electrically connected by a shell, insulating gasket and cover plate.
It solves the problem of difficult tab installation, improves the convenience and stability of tab connection, enhances the battery's electrical connection performance and overall reliability, and extends the battery's lifespan and safety.
Smart Images
Figure CN223598760U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of new energy battery technology, and more specifically, relates to a lithium-ion battery. Background Technology
[0002] Conventional battery cell manufacturing methods include winding and stacking. However, regardless of the winding or stacking structure, the expansion direction of the core after assembly corresponds to the thickness direction of the battery. If negative electrode materials such as silicon-carbon or silicon-oxygen, which expand significantly during charge-discharge cycles, are used, the cell will expand and deform noticeably in the thickness direction, potentially damaging the final product. Therefore, a vertically folded lithium-ion battery assembly technology has emerged. However, this structure suffers from a problem where the plane containing the tabs does not align with the plane of the cell's largest area, making it impossible to weld the tabs. Utility Model Content
[0003] The purpose of this application is to provide a lithium-ion battery to solve the technical problem of difficult tab installation in the prior art.
[0004] To achieve the above objectives, the technical solution adopted in this application is as follows: a lithium-ion battery is provided, comprising a folded cell, a positive electrode tab, and a negative electrode tab; the folded cell has a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion being located on a first side and a second side respectively along the length direction of the folded cell, the first side and the second side being two parallel and opposite side surfaces; the positive electrode tab is connected to the first connecting portion; the negative electrode tab is disposed on the second connecting portion.
[0005] Optionally, the folded battery cell further includes a folded portion, which is stacked in a fan shape along the length of the folded battery cell.
[0006] Optionally, one end of the folded portion is bent toward the first side to form a first connecting portion, and the other end of the folded portion is bent toward the second side to form a second connecting portion.
[0007] Optionally, the area of the first connecting portion is larger than the cross-sectional area of the folded battery cell in the width direction, and / or the area of the second connecting portion is larger than the cross-sectional area of the folded battery cell in the width direction.
[0008] Optionally, the positive electrode tab is welded to the first connecting portion; and / or, the negative electrode tab is welded to the second connecting portion.
[0009] Optionally, the lithium-ion battery further includes a housing, and the folded cell is disposed within the housing.
[0010] Optionally, the lithium-ion battery further includes an insulating pad that covers the folded cell and is positioned near the opening of the housing.
[0011] Optionally, the insulating pad is provided with a first clearance opening and a second clearance opening, the positive electrode tab passing through the first clearance opening; and the negative electrode tab passing through the second clearance opening.
[0012] Optionally, the lithium-ion battery further includes a cover that closes on the opening of the housing.
[0013] Optionally, the positive electrode tab is an aluminum foil sheet, and the negative electrode tab is a copper foil sheet.
[0014] The beneficial effects of the lithium-ion battery provided in this application are as follows: Compared with the prior art, the first connecting part and the second connecting part of the folded cell of the lithium-ion battery of this application are located on the first side and the second side of the length direction of the folded cell, respectively, which increases the connection area of the positive electrode tab and the negative electrode tab, and provides convenience for the installation of the positive electrode tab and the negative electrode tab, thereby effectively solving the technical problem of difficult tab installation. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of this application, 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 This is a schematic diagram of the exploded structure of a lithium-ion battery provided in an embodiment of this application;
[0017] Figure 2 This is a schematic diagram of the assembly of a folded cell with positive and negative electrode tabs in a lithium-ion battery, provided for an embodiment of this application.
[0018] Figure 3 A top view of a folded cell in a lithium-ion battery, provided as an embodiment of this application;
[0019] Figure 4 This is a three-dimensional structural diagram of an insulating pad in a lithium-ion battery, provided as an embodiment of this application.
[0020] The following are the labeling elements in the figure:
[0021] 100-folded battery cell;
[0022] 110 - First connecting part;
[0023] 120 - Second connecting part;
[0024] 130-Fold section;
[0025] 200-Positive electrode tab;
[0026] 300-Negative electrode tab;
[0027] 400 - Housing;
[0028] 500 - Insulating gasket;
[0029] 510 - First Escape Route;
[0030] 520 - Second Escape Route;
[0031] 600 - Cover plate. Detailed Implementation
[0032] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.
[0033] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.
[0034] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0035] 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 application, "multiple" means two or more, unless otherwise explicitly specified.
[0036] Please refer to the following: Figure 1 and Figure 2The lithium-ion battery provided in the embodiments of this application will now be described. This lithium-ion battery includes a folded cell 100, a positive electrode tab 200, and a negative electrode tab 300. The folded cell 100 has a first connecting portion 110 and a second connecting portion 120, which are respectively located on a first side and a second side along the length of the folded cell 100, and the first side and the second side are two parallel and opposite sides. The positive electrode tab 200 is connected to the first connecting portion 110; the negative electrode tab 300 is disposed on the second connecting portion 120.
[0037] Compared with the prior art, the lithium-ion battery provided in this application has a first connecting portion 110 and a second connecting portion 120 of the folded cell 100 located on the first side and the second side of the length direction of the folded cell 100, respectively. This increases the connection area of the positive electrode tab 200 and the negative electrode tab 300, providing convenience for the installation of the positive electrode tab 200 and the negative electrode tab 300, thereby effectively solving the technical problem of difficult tab installation.
[0038] In one embodiment of this application, please refer to the following: Figure 2 and Figure 3 The folded battery cell 100 also includes a folding portion 130, which is stacked in a fan shape along the length of the folded battery cell 100.
[0039] In this embodiment, by providing the folded portion 130, the energy storage space of the battery cell can be effectively increased while maintaining the compactness of the overall battery size. The fan-shaped stacking method allows the battery cell to better adapt to the volume changes of the material during charging and discharging, thereby reducing internal stress caused by material expansion and extending the battery's lifespan.
[0040] In one embodiment of this application, please refer to the following: Figure 2 and Figure 3 One end of the folded portion 130 is bent toward the first side to form a first connecting portion 110, and the other end of the folded portion 130 is bent toward the second side to form a second connecting portion 120.
[0041] In this embodiment, the two ends of the folded portion 130 are bent toward the first side and the second side respectively to form the first connecting portion 110 and the second connecting portion 120, which makes the connection between the positive electrode tab 200 and the negative electrode tab 300 more stable and reduces the problem of connection loosening caused by vibration or impact; at the same time, the connection area is increased, providing more space for welding the tabs, thereby improving the assembly efficiency and reliability of the battery.
[0042] In one embodiment of this application, the area of the first connecting portion 110 is greater than the cross-sectional area of the folded battery cell 100 in the width direction, and / or the area of the second connecting portion 120 is greater than the cross-sectional area of the folded battery cell 100 in the width direction.
[0043] In this embodiment, the area of the first connecting portion 110 is larger than the cross-sectional area of the folded cell 100 in the width direction. This design makes the connection of the positive electrode tab 200 more robust because the larger connection area can better disperse the heat generated during welding, reducing the impact of thermal stress on battery performance. Furthermore, the larger connection area also means that the contact between the positive electrode tab 200 and the first connecting portion 110 is more stable during battery assembly, thereby improving the battery's electrical connection performance and overall reliability. The area of the second connecting portion 120 is larger than the cross-sectional area of the folded cell 100 in the width direction, also possessing the above advantages, namely, a more robust connection and more stable contact of the negative electrode tab 300, thereby improving the battery's electrical connection performance and overall reliability. Specifically, the area of the first connecting portion 110 can be equal to the area of the second connecting portion 120.
[0044] In one embodiment of this application, the positive electrode tab 200 is welded to the first connecting portion 110; and / or, the negative electrode tab 300 is welded to the second connecting portion 120.
[0045] In this embodiment, by welding the positive electrode tab 200 to the first connecting portion 110 and the negative electrode tab 300 to the second connecting portion 120, a more stable and reliable electrical connection between the tabs and the battery cell can be ensured. The welding process can provide higher current carrying capacity and better thermal conductivity than other connection methods, thereby helping to improve the battery's charge / discharge efficiency and thermal management capabilities. Furthermore, the welded connection also has good mechanical strength, capable of withstanding vibrations and shocks that the battery may encounter during use, further ensuring the battery's safety and durability.
[0046] In one embodiment of this application, please refer to Figure 1 The lithium-ion battery also includes a housing 400, and the folded cell 100 is disposed inside the housing 400.
[0047] In this embodiment, the casing 400 not only provides a protective enclosure for the folded battery cell 100, but also helps maintain a stable internal environment for the battery. The design of the casing 400 effectively prevents the influence of the external environment on the battery's interior, such as temperature and humidity, thereby protecting the battery from external interference. Furthermore, the casing 400 also serves a heat dissipation function, helping the battery dissipate excess heat during operation, further improving the battery's safety and performance.
[0048] In one embodiment of this application, please refer to the following: Figure 1 and Figure 4 The lithium-ion battery also includes an insulating pad 500, which covers the folded cell 100 and is positioned near the opening of the housing 400.
[0049] In this embodiment, the use of the insulating gasket 500 effectively prevents short circuits between the battery cell and the casing 400, ensuring battery safety during use. The insulating gasket 500 is typically made of materials with good insulation properties, such as polypropylene and polyester. These materials not only provide sufficient insulation protection but also possess good mechanical strength and heat resistance, adapting to the battery's requirements under different operating conditions. Furthermore, the insulating gasket 500 helps disperse the heat generated during charging and discharging, further improving the battery's heat dissipation efficiency.
[0050] In one embodiment of this application, please refer to Figure 4 The insulating pad 500 is provided with a first clearance opening 510 and a second clearance opening 520. The positive electrode tab 200 passes through the first clearance opening 510, and the negative electrode tab 300 passes through the second clearance opening 520.
[0051] In this embodiment, by providing a first clearance opening 510 and a second clearance opening 520 on the insulating pad 500, the positive electrode tab 200 and the negative electrode tab 300 can pass through smoothly, thereby achieving electrical connection with the outer casing 400. The design of the first clearance opening 510 and the second clearance opening 520 can reduce friction between the positive electrode tab 200 and the negative electrode tab 300 during passage, avoiding damage to the positive electrode tab 200 and the negative electrode tab 300, and ensuring that the electrical performance of the battery is not affected. At the same time, the size and position of the first clearance opening 510 and the second clearance opening 520 can be adjusted according to actual needs to accommodate positive electrode tabs 200 and negative electrode tabs 300 of different sizes and shapes, providing greater design flexibility.
[0052] In one embodiment of this application, please refer to Figure 1 The lithium-ion battery also includes a cover plate 600, which covers the opening of the housing 400.
[0053] In this embodiment, the use of the cover plate 600 further enhances the battery's sealing performance, preventing external factors such as air and moisture from entering the battery, thereby protecting the battery from corrosion and contamination. The cover plate 600 typically fits tightly with the outer casing 400, ensuring the battery's stability under various operating environments. Furthermore, the cover plate 600 can also serve as a platform for battery identification and information display, providing information such as the battery's model, capacity, and production date, facilitating user identification and use.
[0054] In one embodiment of this application, the positive electrode tab 200 is an aluminum foil sheet, and the negative electrode tab 300 is a copper foil sheet.
[0055] In this embodiment, aluminum foil is chosen as the positive electrode tab 200 and copper foil as the negative electrode tab 300 based on their respective excellent electrical conductivity and mechanical properties. Both aluminum and copper are good conductive materials, effectively reducing the internal resistance of the battery and improving its charge / discharge efficiency. Furthermore, the thickness and size of the aluminum and copper foil can be customized according to the specific requirements of the battery to achieve the best performance-to-cost ratio.
[0056] In one embodiment of this application, the lithium-ion battery further includes a fixing device for fixing the positive electrode tab 200 and the negative electrode tab 300, which may be welding, riveting, bonding or other suitable fixing methods.
[0057] In this embodiment, by using a fixing device, the positive electrode tab 200 and the negative electrode tab 300 can be ensured to remain stable during battery assembly and use, preventing tab displacement or detachment due to vibration or impact. Furthermore, the fixing device provides additional mechanical strength, helping the battery maintain performance in harsh environments and extending its lifespan. In some cases, the fixing device can also serve as a current conduction path, contributing to improved battery electrical performance.
[0058] In one embodiment of this application, the lithium-ion battery further includes sensors for detecting battery status, such as temperature sensors and voltage sensors.
[0059] In this embodiment, the integration of sensors enables the battery to monitor its operating status in real time, including key parameters such as temperature and voltage. This data allows for precise control of the battery's charging and discharging process, preventing overcharging, over-discharging, and other abnormal conditions, thereby improving battery safety and reliability. Furthermore, this data can be used in a battery management system (BMS) to optimize battery efficiency and extend its lifespan.
[0060] In one embodiment of this application, the lithium-ion battery further includes a heat dissipation structure for heat dissipation, such as a heat sink or heat dissipation channel.
[0061] In this embodiment, the heat dissipation structure design helps the battery effectively dissipate heat during operation, preventing performance degradation or damage due to overheating. The heat dissipation structure can be an internal heat dissipation channel within the battery, or a heat sink or other heat dissipation device on the battery casing 400. By optimizing the heat dissipation structure design, the battery's thermal management capabilities can be improved, ensuring stable battery performance under various operating conditions.
[0062] In one embodiment of this application, the lithium-ion battery further includes a protection circuit for protecting the battery, which can prevent abnormal conditions such as overcharging, over-discharging, and short circuits.
[0063] In this embodiment, the protection circuit is a crucial component for the safe operation of the battery. It monitors parameters such as battery voltage, current, and temperature, automatically cutting off the circuit or adjusting the battery's operating state to prevent damage from abnormal conditions. The protection circuit can be designed based on various technologies, such as analog circuits, digital circuits, or microprocessor control, to achieve comprehensive battery protection.
[0064] The lithium-ion battery of this application, through its innovative structural design, effectively solves the problems existing in the prior art, possessing high practical value and broad market prospects. In practical applications, the lithium-ion battery of this application can be widely used in various portable electronic devices, such as mobile phones, tablets, and laptops, as well as electric vehicles and energy storage systems. Its unique structural design not only improves battery performance but also adapts to the special requirements of different devices for battery shape and size, providing new possibilities for the development of new energy battery technology.
[0065] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A lithium-ion battery, characterized by, The lithium ion battery comprises: a folded battery cell having a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion being located at a first side and a second side of the folded battery cell in a length direction of the folded battery cell, the first side and the second side being two parallel opposite sides; a positive electrode tab connected to the first connecting portion; a negative electrode tab provided on the second connecting portion.
2. The lithium-ion battery of claim 1, wherein, The folded battery cell further comprises a folding portion, the folding portion being stacked along the length direction of the folded battery cell in a fan shape.
3. The lithium-ion battery of claim 2, wherein, One end of the folding portion is bent towards the first side to form the first connecting portion, and the other end of the folding portion is bent towards the second side to form the second connecting portion.
4. The lithium-ion battery of claim 1, wherein, The area of the first connecting portion is greater than the cross-sectional area of the folded battery cell in a width direction, and / or the area of the second connecting portion is greater than the cross-sectional area of the folded battery cell in the width direction.
5. The lithium-ion battery of claim 1, wherein, The positive electrode tab is welded to the first connecting portion, and / or the negative electrode tab is welded to the second connecting portion.
6. The lithium-ion battery of any one of claims 1-5, wherein, The lithium ion battery further comprises a shell, and the folded battery cell is arranged in the shell.
7. The lithium-ion battery of claim 6, wherein, The lithium ion battery further comprises an insulating gasket, the insulating gasket being arranged on the folded battery cell and close to an open end of the shell.
8. The lithium-ion battery of claim 7, wherein, The insulating gasket is provided with a first avoiding opening and a second avoiding opening, the positive electrode tab passes through the first avoiding opening, and the negative electrode tab passes through the second avoiding opening.
9. The lithium-ion battery of claim 6, wherein, The lithium ion battery further comprises a cover plate, the cover plate being arranged on the open end of the shell.
10. The lithium-ion battery of any one of claims 7-9, wherein the lithium-ion battery is a lithium-ion battery cell. The positive electrode tab is an aluminum foil, and the negative electrode tab is a copper foil.