Tab misalignment structure and secondary battery

Abstract

The utility model discloses a kind of tab misplacement structures and secondary batteries, it is related to the technical field of battery cell. Among them, the tab misplacement structure includes: a first winding core;Two first tabs are arranged in the flat surface side of the first winding core along the preset direction interval array, and located on the upper surface side close to the first winding core;And two second tabs are arranged on the flat surface of the first winding core on the side away from the first tab along the preset direction interval array, and located on the lower surface side close to the first winding core;Wherein, two the first tab is located between two the second tab;Or, two the second tab is located between two the first tab, so that first tab and second tab misplacement arrangement.The utility model solves the problem that the existing battery cell structure due to tab thickness is too thick, resulting in virtual welding risk when welding, and tab thickness occupies more space, affects battery cell design space.

Description

Technical Field

[0001] This utility model relates to the field of battery cell technology, and in particular to a tab misalignment structure and a secondary battery. Background Technology

[0002] Due to their excellent electrochemical performance, secondary batteries are widely used in various fields, such as digital products, power, and energy storage. As the requirements for battery energy density, discharge rate, and discharge temperature rise increase, the thickness of the battery also increases, as do the number of positive and negative electrode layers and the number of tab layers. When the number of tab layers increases to a certain thickness, ultrasonic welding may result in incomplete welding, leading to a decrease in production yield.

[0003] The existing battery cell structure suffers from problems such as excessively thick tabs, leading to the risk of incomplete soldering during welding, and the tab thickness also occupies a significant amount of space, impacting the cell design space. Currently, no effective solution has been proposed to address these issues. Utility Model Content

[0004] Purpose of the utility model: To provide a tab misalignment structure and a secondary battery, so as to at least solve one of the problems existing in the prior art.

[0005] Technical solution: A tab misalignment structure, comprising:

[0006] First roll core;

[0007] Two first tabs are arranged in a predetermined array at intervals on one side of the flat surface of the first winding core, and are located near the upper surface of the first winding core; and

[0008] Two second tabs are arranged in a predetermined array at intervals on the flat surface of the first core on the side away from the first tab, and are located on the side close to the lower surface of the first core.

[0009] Wherein, the two first electrodes are located between the two second electrodes; or, the two second electrodes are located between the two first electrodes, so that the first electrodes and the second electrodes are misaligned.

[0010] Preferably, a second core is stacked at the bottom of the first core.

[0011] Preferably, two third tabs are arranged in a predetermined array along the flat side of the second core.

[0012] Wherein, the two third electrodes are respectively located adjacent to each other between the two first electrodes; or, the two first electrodes are respectively located adjacent to each other between the two third electrodes, so that the first electrodes and the third electrodes are misaligned.

[0013] Preferably, two fourth pole tabs are arranged in a predetermined array on the flat surface of the second core away from the third pole tab along a predetermined direction;

[0014] Wherein, the two fourth electrodes are respectively located adjacent to each other between the two second electrodes; or, the two second electrodes are respectively located adjacent to each other between the two fourth electrodes, so that the second electrodes and the fourth electrodes are misaligned.

[0015] Preferably, the first electrode and the second electrode have opposite polarities;

[0016] Wherein, the first electrode is a positive electrode and the second electrode is a negative electrode; or, the first electrode is a negative electrode and the second electrode is a positive electrode.

[0017] Preferably, the third electrode and the fourth electrode have opposite polarities;

[0018] Wherein, the third electrode is a positive electrode and the fourth electrode is a negative electrode; or, the third electrode is a negative electrode and the fourth electrode is a positive electrode.

[0019] The polarity of the third electrode is the same as that of the first electrode, and the polarity of the fourth electrode is the same as that of the second electrode.

[0020] Preferably, the first electrode and the third electrode are connected by a first connecting piece.

[0021] Preferably, the second electrode and the fourth electrode are connected by a second connecting piece.

[0022] Preferably, the first electrode tab, the third electrode tab, and the first connecting piece are made of aluminum, and the second electrode tab, the fourth electrode tab, and the second connecting piece are made of copper; or, the first electrode tab, the third electrode tab, and the first connecting piece are made of copper, and the second electrode tab, the fourth electrode tab, and the second connecting piece are made of aluminum.

[0023] To achieve the above objectives, according to another aspect of this application, a secondary battery is also provided.

[0024] The secondary battery according to this application includes the aforementioned tab misalignment structure.

[0025] Beneficial effects: In the embodiments of this application, the electrode tabs are staggered, with the two first electrode tabs located between the two second electrode tabs; or, the two second electrode tabs located between the two first electrode tabs, so that the first electrode tabs and the second electrode tabs are staggered, thus achieving the purpose of staggered electrode tabs on a single core. This achieves the technical effect of facilitating subsequent electrode tab welding and reducing electrode tab thickness, thereby solving the technical problem that the existing cell structure has the risk of poor welding during welding due to excessive electrode tab thickness, and that the electrode tab thickness occupies a lot of space, affecting the cell design space. Attached Figure Description

[0026] Figure 1 This is a three-dimensional schematic diagram of the first core of the electrode misalignment structure of this utility model;

[0027] Figure 2 This is a schematic diagram of the first core planar structure of the electrode misalignment structure of this utility model;

[0028] Figure 3 This is a right view of the first core of the electrode misalignment structure of this utility model;

[0029] Figure 4 This is a three-dimensional schematic diagram of the first and second cores stacked together in the electrode tab misalignment structure of this utility model;

[0030] Figure 5 This is a front view of the first and second cores stacked together in the electrode tab misalignment structure of this utility model;

[0031] Figure 6 This is a right view of the first and second cores stacked together in the electrode tab misalignment structure of this utility model; and

[0032] Figure 7 This is a three-dimensional schematic diagram of the connection between the first core and the second core of the electrode tab misalignment structure of this utility model.

[0033] The attached figures are labeled as follows:

[0034] 10. First core;

[0035] 20. First pole ear;

[0036] 30. Second pole ear;

[0037] 40. Second core;

[0038] 50. Third pole ear;

[0039] 60. The fourth pole ear;

[0040] 70. First connecting piece;

[0041] 80. Second connecting piece. Detailed Implementation

[0042] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0043] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0044] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0045] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0046] like Figure 1-7 As shown, this application relates to a tab misalignment structure and a secondary battery. Figure 1-3 As shown, the electrode misalignment structure includes: a first core 10; the first core 10 refers to the main structural unit inside the battery, which is usually formed by winding multiple layers of positive and negative electrode materials, separators, etc., and has a flat surface and upper / lower surfaces.

[0047] Two first tabs 20 are arranged in a spaced array along a preset direction on one side of the flat surface of the first core 10, and are located near the upper surface of the first core 10; this enables the two tabs to be positioned on one side of the first core 10 according to a preset location. The preset direction can be a horizontal direction or the X-axis direction in a two-coordinate system.

[0048] Two second tabs 30 are arranged in a predetermined array at intervals on the flat surface of the first core 10 on the side away from the first tab 20, and are located on the side close to the lower surface of the first core 10; this enables a good assembly effect of the two second tabs 30, thereby achieving a stable structure. The predetermined direction can be a horizontal direction or the X-axis direction in a two-coordinate system.

[0049] In this configuration, the two first tabs 20 are located between the two second tabs 30; or, the two second tabs 30 are located between the two first tabs 20, so that the first tabs 20 and the second tabs 30 are staggered. By staggering the first tabs 20 and the second tabs 30 on both sides of the first core 10, the number of ultrasonically welded tab layers can be reduced without changing the number of winding layers, thus avoiding incomplete welding. At the same time, the space occupied by the tab thickness can be reduced, thereby increasing the battery energy density.

[0050] As can be seen from the above description, this application achieves the following technical effects:

[0051] In this embodiment, a staggered tab arrangement is adopted, with the two first tabs 20 located between the two second tabs 30; or, the two second tabs 30 located between the two first tabs 20, so that the first tabs 20 and the second tabs 30 are staggered, achieving the purpose of staggered tab arrangement on a single core. This facilitates subsequent tab welding and reduces tab thickness, thereby solving the technical problem that existing cell structures have the risk of incomplete welding due to excessive tab thickness, and that the large space occupied by the tab thickness affects the cell design space.

[0052] like Figure 4-6 As shown, a second core 40 is stacked at the bottom of the first core 10. It can be understood that stacking a second core 40 at the bottom of the first core 10 forms a double-layer core structure. This enables higher capacity; simultaneously, it facilitates modular stacking, improving cell scalability; and it helps in manufacturing stacked batteries or high-rate pouch batteries.

[0053] Furthermore, two third tabs 50 are arranged in a predetermined array at intervals on one side of the flat surface of the second core 40.

[0054] The two third tabs 50 are respectively located adjacent to each other between the two first tabs 20; or, the two first tabs 20 are respectively located adjacent to each other between the two third tabs 50, so that the first tabs 20 and the third tabs 50 are staggered. It can be understood that setting the third tab 50 on one side of the second core 40 and forming a staggered arrangement with the first tabs 20 can avoid multiple tabs stacked in the same position, reduce local thickness, and improve structural uniformity; it can also reduce the risk of welding heat accumulation; and it is conducive to uniform current distribution, enhancing the consistency and thermal stability of the battery.

[0055] Furthermore, two fourth pole tabs 60 are arranged in a predetermined array on the flat surface of the second core 40 away from the third pole tab 50.

[0056] Specifically, the two fourth pole tabs 60 are respectively located adjacent to each other between the two second pole tabs 30; or, the two second pole tabs 30 are respectively located adjacent to each other between the two fourth pole tabs 60, so that the second pole tabs 30 and the fourth pole tabs 60 are staggered. It can be understood that the fourth pole tab 60 is provided on the other side of the second core 40, and its position is also staggered from the second pole tabs 30. This can further optimize the pole tab lead-out path; at the same time, it can also improve space utilization efficiency.

[0057] Furthermore, the first electrode 20 and the second electrode 30 have opposite polarities;

[0058] In this configuration, the first electrode tab 20 is the positive electrode tab, and the second electrode tab 30 is the negative electrode tab; or, the first electrode tab 20 is the negative electrode tab, and the second electrode tab 30 is the positive electrode tab. This clearly defines the polarity correspondence, facilitating grouping and regional welding of the electrode tabs; it also reduces the risk of incorrect polarity connection and enhances production consistency.

[0059] Furthermore, the third electrode 50 and the fourth electrode 60 have opposite polarities;

[0060] Wherein, the third electrode 50 is a positive electrode and the fourth electrode 60 is a negative electrode; or, the third electrode 50 is a negative electrode and the fourth electrode 60 is a positive electrode.

[0061] The polarity of the third tab 50 is the same as that of the first tab 20, and the polarity of the fourth tab 60 is the same as that of the second tab 30. This ensures electrical connection consistency between the two core layers; supports parallel or series connection of multiple cores; and reduces the risk of short circuits and thermal runaway caused by polarity confusion.

[0062] like Figure 7As shown, the first tab 20 and the third tab 50 are connected by a first connecting piece 70. It can be understood that the connecting piece provides physical conductivity between tabs of the same polarity; this creates an equipotential region, enhances current output capability, reduces connection resistance, minimizes power loss, and strengthens structural rigidity and integration.

[0063] The connection method can be welding, ultrasonic, laser connection, etc., and is not limited in this application.

[0064] like Figure 7 As shown, the second tab 30 and the fourth tab 60 are connected by a second connecting piece 80. It can be understood that the second tab 30 and the fourth tab 60 are connected by the second connecting piece 80 to form a complete circuit loop. This achieves a complete correspondence between the positive and negative terminals, resulting in a more stable current path; at the same time, it provides good consistency for the overall module or PACK structure.

[0065] Furthermore, the first tab 20, the third tab 50, and the first connecting piece 70 are made of aluminum, while the second tab 30, the fourth tab 60, and the second connecting piece 80 are made of copper; or, the first tab 20, the third tab 50, and the first connecting piece 70 are made of copper, while the second tab 30, the fourth tab 60, and the second connecting piece 80 are made of aluminum. This ensures good conductivity.

[0066] Of course, aluminum is often used for the positive electrode, and copper is often used for the negative electrode.

[0067] Furthermore, a gap is provided between the first tab 20 and the third tab 50. Understandably, this ensures a good assembly connection of the first connecting piece 70.

[0068] Furthermore, a gap is provided between the second tab 30 and the fourth tab 60. This is understandably to ensure a good assembly connection of the second connecting piece 80.

[0069] This application also relates to a secondary battery, including the aforementioned tab misalignment structure.

[0070] This application also has the following beneficial effects:

[0071] The staggered tab structure of the core ensures the current-carrying area of ​​the tabs while reducing the tab thickness, enhancing welding reliability and improving the safety performance of the cell; the reduced space occupied by the tab thickness increases the design space of the cell in the tab direction, improving the overall performance of the cell.

[0072] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A misaligned electrode structure, characterized in that, include: First core (10); Two first tabs (20) are arranged in a predetermined array at intervals on one side of the flat surface of the first winding core (10), and are located near the upper surface of the first winding core (10); and Two second tabs (30) are arranged in a predetermined array at intervals on the flat surface of the first core (10) on the side away from the first tab (20), and are located on the side close to the lower surface of the first core (10). Wherein, the two first electrodes (20) are located between the two second electrodes (30); or, the two second electrodes (30) are located between the two first electrodes (20) so that the first electrodes (20) and the second electrodes (30) are misaligned.

2. The electrode misalignment structure according to claim 1, characterized in that, A second core (40) is stacked at the bottom of the first core (10).

3. The electrode misalignment structure according to claim 2, characterized in that, Two third pole tabs (50) are arranged in a predetermined array on one side of the flat surface of the second core (40); The two third electrodes (50) are respectively located adjacent to each other between the two first electrodes (20); or, the two first electrodes (20) are respectively located adjacent to each other between the two third electrodes (50), so that the first electrodes (20) and the third electrodes (50) are staggered.

4. The electrode misalignment structure according to claim 3, characterized in that, Two fourth pole tabs (60) are arranged in a predetermined array on the flat surface of the second core (40) away from the third pole tab (50); Wherein, the two fourth pole ears (60) are respectively located adjacent to each other between the two second pole ears (30); or, the two second pole ears (30) are respectively located adjacent to each other between the two fourth pole ears (60), so that the second pole ears (30) and the fourth pole ears (60) are staggered.

5. The electrode misalignment structure according to claim 1, characterized in that, The first electrode (20) and the second electrode (30) have opposite polarities; Wherein, the first electrode (20) is a positive electrode and the second electrode (30) is a negative electrode; or, the first electrode (20) is a negative electrode and the second electrode (30) is a positive electrode.

6. The electrode misalignment structure according to claim 4, characterized in that, The third electrode (50) and the fourth electrode (60) have opposite polarities; Wherein, the third electrode (50) is a positive electrode and the fourth electrode (60) is a negative electrode; or, the third electrode (50) is a negative electrode and the fourth electrode (60) is a positive electrode. The polarity of the third electrode (50) is the same as that of the first electrode (20), and the polarity of the fourth electrode (60) is the same as that of the second electrode (30).

7. The electrode misalignment structure according to claim 4, characterized in that, The first electrode (20) and the third electrode (50) are connected by a first connecting piece (70).

8. The electrode misalignment structure according to claim 7, characterized in that, The second electrode (30) and the fourth electrode (60) are connected by a second connecting piece (80).

9. The electrode misalignment structure according to claim 8, characterized in that, The first tab (20), the third tab (50), and the first connecting piece (70) are made of aluminum, and the second tab (30), the fourth tab (60), and the second connecting piece (80) are made of copper; or, the first tab (20), the third tab (50), and the first connecting piece (70) are made of copper, and the second tab (30), the fourth tab (60), and the second connecting piece (80) are made of aluminum.

10. A secondary battery, characterized in that, Includes the electrode misalignment structure as described in any one of claims 1-9.

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