Battery cell tab structure and battery

Abstract

The invention provides a battery cell tab structure, and relates to the technical field of batteries. The battery cell tab structure comprises an inner tab and an outer tab, and the lower surface of the outer tab abuts against the upper surface of the inner tab; the elastic element is arranged between the inner tab and the outer tab, one end of the elastic element abuts against the inner tab, and the other end of the elastic element abuts against the outer tab; the elastic sliding block comprises an insulating sheet, the insulating sheet can slide between a first position and a second position, the first position is arranged on the outer side of the inner tab and the outer tab, and the second position is arranged between the inner tab and the outer tab; wherein the length of the elastic element is influenced by temperature, when the temperature of the elastic element is greater than a threshold value, the elastic element extends, the lower surface of the outer tab is separated from the upper surface of the inner tab, and the insulating sheet slides from the first position to the second position. By utilizing the deformation characteristic of the SMA spring, when the temperature of the tabs exceeds a threshold value, the elastic element extends, the inner tab and the outer tab are separated, and the insulating sheet slides between the inner tab and the outer tab, so that dual physical isolation is formed.

Description

Technical Field

[0001] This invention belongs to the field of battery technology, specifically relating to a cell tab structure and a battery. Background Technology

[0002] With the widespread application of lithium-ion batteries in electric vehicles, energy storage systems, and consumer electronics, battery safety has become an increasingly important concern. Especially in battery modules or packs composed of multiple cells connected in series and parallel, if a cell experiences thermal runaway due to internal short circuits, overcharging, or mechanical damage, the resulting high temperature can be rapidly conducted to adjacent cells through the tabs, triggering a chain reaction and causing a serious thermal propagation accident.

[0003] Currently, pouch lithium-ion cells generally use exposed metal tabs for electrical connection. While this type of structure has mature technology and good conductivity, it poses significant safety hazards: On the one hand, exposed tabs are susceptible to bending, deformation, or even short circuits due to impacts or vibrations during transportation, assembly, or use; on the other hand, when the cell experiences abnormal temperature rise, traditional tabs cannot actively cut off the current path, causing the faulty cell to continuously transfer heat and current to the surrounding area, exacerbating the risk of thermal runaway.

[0004] To improve safety, the industry has attempted to introduce protection mechanisms such as fuses, PTC elements, or mechanical circuit breakers. However, these solutions often suffer from slow response times, large size, poor reliability, or difficulty in integrating them into the limited space of pouch cells. Especially in pouch batteries, the tab area is compact, and both sealing and electrical connection stability must be considered, making conventional protection structures difficult to apply.

[0005] Furthermore, existing electrode structures are typically rigid and lack dynamic response capabilities to temperature changes. When the internal temperature of the battery cell rises abnormally, they cannot achieve integrated intelligent protection functions of "sensing-response-isolation". Therefore, there is an urgent need for a new electrode structure that can maintain a low-impedance electrical connection under normal operating conditions, while automatically and reliably cutting off the current path when the temperature exceeds a safe threshold, effectively blocking the heat spread path, while also taking into account structural compactness, mechanical stability, and manufacturability. Summary of the Invention

[0006] The purpose of this invention is to address the aforementioned problems in the prior art by proposing a battery cell tab structure.

[0007] The objective of this invention can be achieved through the following technical solution: a battery cell tab structure, comprising: Inner pole ear; The outer electrode tab has its lower surface abutting against the upper surface of the inner electrode tab. An elastic element is disposed between the inner electrode and the outer electrode, with one end of the elastic element abutting against the inner electrode and the other end of the elastic element abutting against the outer electrode; An elastic slider includes an insulating sheet that can slide between a first position and a second position. The first position is located outside the inner electrode and the outer electrode, and the second position is located between the inner electrode and the outer electrode. The length of the elastic element is affected by temperature. When the temperature of the elastic element is greater than a threshold, the elastic element elongates, the lower surface of the outer tab separates from the upper surface of the inner tab, and the insulating sheet slides from the first position to the second position.

[0008] As a further improvement of the present invention, the sliding direction of the insulating sheet is perpendicular to the separation direction of the outer tab and the inner tab.

[0009] As a further improvement of the present invention, the upper surface of the inner electrode ear is provided with a first groove, the lower surface of the outer electrode ear is provided with a second groove, the elastic slider further includes a mounting shaft, the mounting shaft is installed in the accommodating space maintained by the first groove and the second groove, and the insulating sheet can slide along the length direction of the mounting shaft.

[0010] As a further improvement of the present invention, the insulating sheet is provided with a plurality of spring sheets, each spring sheet including a spring segment, a spring section and a heat transfer shaft. The spring segment is fixedly connected to the insulating sheet, one end of the spring section is connected to the spring segment, and the other end of the spring section is connected to the heat transfer shaft. The heat transfer shaft passes through the spring section and is inserted into the mounting shaft.

[0011] As a further improvement of the present invention, it also includes a support box, wherein the inner electrode ear is disposed in the inner cavity of the support box, and a plurality of support blocks are disposed in the inner cavity of the support box, wherein the support blocks are provided with shaft holes, and the mounting shaft is installed in the shaft holes.

[0012] As a further improvement of the present invention, the support box is provided with support portions at both ends along the length direction, and the lower surface of the inner electrode ear is provided with a spring piece, which abuts against the support portion.

[0013] As a further improvement of the present invention, the side of the inner electrode ear is provided with a recess, and the side wall of the inner cavity of the support box is provided with a boss, and the recess and the boss are in concave-convex fit.

[0014] As a further improvement of the present invention, the outer electrode includes a first part and a second part connected to each other. The first part is made of a metallic material, and the second part is made of a non-metallic material. The second part is wrapped around the outer periphery of the first part, and a recess is provided on the top of the support box, with the second part disposed in the recess.

[0015] As a further improvement of the present invention, one of the lower surface of the outer electrode ear and the upper surface of the inner electrode ear are provided with a plurality of hemispherical concave points, and the other is provided with a plurality of hemispherical convex points, wherein the hemispherical concave points and the hemispherical convex points are in concave-convex fit.

[0016] The present invention also provides a battery comprising the cell tab structure described in any of the preceding claims.

[0017] Based on the above technical solution, the present invention can produce at least the following technical effects: 1. This invention utilizes the deformation characteristics of shape memory materials at a specific phase transition temperature (e.g., 85°C). When the temperature of the electrode exceeds the threshold due to internal short circuit, overcharging, or other faults in the battery cell, the elastic element (SMA spring) elongates due to heat, pushing the inner electrode and outer electrode to separate. At the same time, another set of SMA springs (spring segments) drives the insulating sheet to slide between the inner and outer electrodes, forming a double physical isolation and completely cutting off the current path. This mechanism does not require external control signals or power, has a rapid response and reliable operation, and can effectively block the transfer of heat and current from the faulty battery cell to adjacent battery cells, significantly reducing the risk of thermal runaway of the battery module. 2. In this invention, the inner electrode tab is embedded in a non-metallic support box, and the outer electrode tab is also sealed to the support box through a non-metallic support block (second part), which greatly reduces the exposed area of ​​the electrode tab and avoids the risk of electrode tab exposure. At the same time, the contact surfaces of the inner and outer electrode tabs adopt a hemispherical concave-convex mating structure, which not only increases the effective contact area and reduces the contact resistance, but also maintains a stable electrical connection under small displacement, which significantly improves mechanical robustness and safety of use. 3. When the abnormal temperature rise is eliminated and the temperature drops below the phase change threshold, the elastic element and spring segment can automatically return to the initial compression state, drive the inner and outer tabs to re-attach, and the insulating sheet to return to its original position, restoring the electrical connection. This self-resetting characteristic allows the structure to work repeatedly in multiple thermal disturbance events without manual intervention or replacement of parts, improving the long-term reliability and maintenance economy of the battery system. 4. The heat on the inner and outer tabs can be efficiently transferred to the spring section through the mounting shaft and heat transfer shaft. This thermal coupling design ensures that the spring section can act in a timely manner, avoiding protection failure due to thermal hysteresis. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is an exploded view of the battery cell tab structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the support box in this invention.

[0021] Figure 3 This is a top view of the support box in this invention.

[0022] Figure 4 This is a schematic diagram of the inner electrode ear in this invention.

[0023] Figure 5 This is a side view of the inner electrode tab in this invention.

[0024] Figure 6 This is a schematic diagram of the elastic slider in this invention.

[0025] Figure 7 This is a schematic diagram of the spring sheet in this invention.

[0026] Figure 8 yes Figure 7 A diagram from another perspective.

[0027] Figure 9 This is a schematic diagram of the structure of the outer electrode in this invention.

[0028] Figure 10 This is a top view of the outer tab in this invention.

[0029] In the figure, 100 is the inner electrode ear; 110 is the first groove; 120 is the spring piece; 130 is the recess; 140 is the hemispherical concave point; 150 is the first spring hole; 200 is the outer electrode ear; 210 is the first part; 211 is the second groove; 212 is the hemispherical protrusion; 213 is the second spring hole; 220 is the second part; 300 is the elastic element; 400 is the elastic slider; 410 is the insulating sheet; 420 is the mounting shaft; 430 is the spring piece; 431 is the spring segment; 432 is the spring segment; 433 is the heat transfer shaft; 500 is the support box; 510 is the support block; 511 is the shaft hole; 520 is the support part; 530 is the boss; 540 is the concave platform. Detailed Implementation

[0030] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of the components in a specific posture (as shown in the attached figures). If the specific posture changes, the directional indication will also change accordingly. Furthermore, descriptions involving "first," "second," or "a" in the present invention are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. In the description of the present invention, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly defined. In the present invention, unless otherwise explicitly specified and defined, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise explicitly defined. For those skilled in the art, the specific meanings of the above terms in this invention can be understood according to the specific circumstances. Furthermore, the technical solutions of the various embodiments of this invention can be combined with each other, but only on the basis that those skilled in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0031] The following are specific embodiments of the present invention, in conjunction with the appendix. Figures 1-10 The technical solution of the present invention will be further described below, but the present invention is not limited to the following embodiments.

[0032] This invention provides a cell tab structure, primarily used in pouch lithium-ion batteries. It automatically disconnects the electrical connection between the inner tab 100 and the outer tab 200 when an abnormal temperature rise occurs in the cell (such as in the early stages of thermal runaway), effectively preventing further current flow and heat transfer to adjacent cells, thus achieving thermal safety protection. This structure is integrated into the cell packaging area, with key functional components encapsulated internally by a non-metallic support box 500, combining sealing, mechanical strength, and intelligent response capabilities.

[0033] The battery cell tab structure mainly includes: an inner tab 100, an outer tab 200, an elastic element 300, an elastic slider 400, and a support box 500. The elastic element 300 uses an SMA (shape memory alloy) spring. The inner tab 100 is made of metal, typically aluminum or copper, and its lower surface is used for electrical connection with the internal electrode (positive or negative) of the battery cell via ultrasonic welding or laser welding. The upper surface is designed with multiple hemispherical recesses 140, a first groove 110, and a first spring hole 150. In this embodiment, multiple first grooves 110 are provided and penetrate the upper surface, dividing the upper surface of the inner tab 100 into multiple regions. Each region has two rows of hemispherical recesses 140. Two first spring holes 150 are provided, located near the two ends of the inner tab 100 along its length. The outer tab 200 is also a conductive metal structure, but it is composed of a first part 210 and a second part 220 that are connected to each other: the first part 210 is a metal part (i.e., the outer tab metal block) and the second part 220 is a non-metal part (i.e., a non-metallic support block).

[0034] The lower surface of the metal part (first part 210) is provided with a hemispherical protrusion 212, a second groove 211, and a second spring hole 213 that match the inner tab 100. The hemispherical protrusion 212 mates with the recess of the hemispherical concave point 140. The second groove 211 and the first groove 110 form a receiving space for mounting the elastic slider 400. The second spring hole 213 and the first spring hole 150 are respectively used to mount the two ends of the elastic element 300. The inner tab 100 and the outer tab 200 form a large-area, low-resistance electrical contact interface through the concave-convex fit. In other embodiments, the positions of the hemispherical concave point 140 and the hemispherical protrusion 212 can be interchanged. The fit between the hemispherical concave point 140 and the hemispherical protrusion 212 not only increases the actual contact area but also has a certain self-aligning capability, which can compensate for minor assembly errors. The second part 220 uses high-temperature and corrosion-resistant engineering plastics, which are firmly bonded to the metal parts through injection molding or hot extrusion processes, and embedded in the recess 540 on the top of the support box 500. It is then sealed and fixed to the support box 500 through ultrasonic welding and other methods to ensure that the internal environment of the battery cell is completely isolated from the outside.

[0035] The support box 500 is the load-bearing structure of this invention. It is made entirely of non-metallic insulating material, exhibiting excellent chemical and thermal stability. Its outer wall is tightly bonded to the aluminum-plastic film encapsulation layer of the soft-pack battery cell via a heat-sealing process. Part of it is located inside the battery cell, while another part extends to the outside, serving as a transition interface between the internal and external circuits. Support portions 520 are provided at both ends of the inner cavity of the support box 500 along its length to receive the spring pieces 120 disposed on the lower surface of the inner tab 100. In this embodiment, the spring pieces 120 are disposed at both ends of the lower surface of the inner tab 100 along its length. One end of the spring piece 120 is fixedly connected to the lower surface of the inner tab 100, and the other end abuts against the support portion 520. After installation, the spring piece 120 is in a slightly compressed state, giving the inner tab 100 displacement freedom along the height direction (i.e., perpendicular to the tab plane), allowing it to move smoothly up and down under the drive of the elastic element 300 without jamming or deflection. In addition, the inner wall of the support box 500 is provided with symmetrically distributed bosses 530, which form a concave-convex fit with the recesses 130 machined on the side of the inner electrode 100, effectively limiting the horizontal displacement of the inner electrode 100. The injection-molded overmolded structure of the non-metallic outer electrode support block (second part 220) and the metal part (first part 210) ensures both mechanical strength and a reliable seal between the metal and non-metal parts.

[0036] At least one elastic element 300 is provided between the inner tab 100 and the outer tab 200. The elastic element 300 is made of a material whose length changes with temperature, preferably an SMA (shape memory alloy) spring. In this embodiment, it can be made of TiNi-based alloy material, and its phase transition temperature threshold is set to 85°C (which can be adjusted according to different application scenarios). In other embodiments, the elastic element 300 can also be made of other materials. One end of the elastic element 300 is inserted into the first spring hole 150 on the upper surface of the inner tab 100, and the other end is inserted into the second spring hole 213 on the lower surface of the outer tab 200. When the temperature is below 85°C, it is in a compressed state, so that the hemispherical protrusion 212 of the outer tab 200 and the hemispherical concave point 140 of the inner tab 100 are tightly fitted to form a stable and reliable electrical connection. When the local temperature of the battery cell rises to over 85°C due to internal short circuit, overcharging or other faults, the elastic element 300 undergoes an austenitic phase transformation upon heating, resulting in significant elongation deformation. This pushes the inner tab 100 downward, causing the two tabs to separate and cutting off the current path.

[0037] To further enhance the reliability of power outages, this invention also includes an elastic slider 400, the core component of which is an insulating sheet 410, preferably made of a ceramic material with high insulation and high heat resistance (such as alumina ceramic). The insulating sheet 410 can slide between a first position and a second position: when the temperature is below 85°C, the insulating sheet 410 is located outside the inner tab 100 and the outer tab 200 (i.e., the first position), without interfering with normal electrical connection. It should be noted that "outside" refers to not being on the connection path between the inner and outer tabs; when the temperature exceeds 85°C, the insulating sheet 410 is driven to slide between the two tabs (i.e., the second position), forming a physical isolation barrier. By inserting the insulating sheet 410 between the inner tab 100 and the outer tab 200, the creepage distance between them is significantly increased. Even if the tabs are not completely separated due to manufacturing tolerances or other reasons, residual conductive paths can be effectively blocked, eliminating the risk of micro-arc discharge.

[0038] To achieve the aforementioned sliding function, the elastic slider 400 also includes a mounting shaft 420 and multiple spring plates 430. The mounting shaft 420 and a portion of the spring plates 430 are inserted into each other. The mounting shaft 420 is a metal heat-conducting shaft, located in the receiving space formed by the first groove 110 on the upper surface of the inner tab 100 and the corresponding second groove 211 on the lower surface of the outer tab 200. One end of the mounting shaft 420 and one end of the spring plates 430 are respectively embedded in the shaft holes 511 on the support blocks 510 on both sides of the inner cavity of the support box 500. Multiple spring plates 430 are evenly distributed on one side of the insulating sheet 410. Each spring plate 430 is formed by sequentially connecting a spring segment 431, a spring segment 432, and a heat transfer shaft 433. The spring segment 431 is fixedly connected to the insulating sheet 410, one end of the spring segment 432 is connected to the spring segment 431, and the other end of the spring segment 432 is connected to the heat transfer shaft 433. The spring segment 431 and the insulating sheet 410 are rigidly fixed by welding or high-strength adhesive, ensuring that the insulating sheet 410 moves when the spring segment 431 moves. The spring segment 432 is made of the same TiNi alloy SMA material as described above, and its phase transition temperature is also 85℃. The heat transfer shaft 433 is a metal rod, one end of which is connected to the spring segment 432, and the other end passes through the spring segment 432 and is inserted into the channel inside the mounting shaft 420 to form a tight fit. The insulating sheet 410 is connected to the mounting shaft 420 through the spring segment 431 and can slide freely along the length of the mounting shaft 420 (i.e., perpendicular to the tab separation direction).

[0039] To ensure the response speed of the elastic slider 400, its structural design cleverly constructs an efficient heat conduction path: when the inner tab 100 or outer tab 200 heats up due to the heat generated by the battery cell, the heat is first conducted to the mounting shaft 420, and then quickly transferred to the spring segment 432 via the heat transfer shaft 433. When the temperature of the spring segment 432 reaches 85°C, it undergoes tensile deformation, pushing the spring segment 431 to move. Since the spring segment 431 is fixedly connected to the insulating sheet 410, it pushes the insulating sheet 410 to slide into the gap between the inner tab 100 and the outer tab 200, completing the electrical isolation action.

[0040] In this embodiment, the support portion 520, boss 530, support block 510, and recess 540 are arranged from bottom to top along the height direction of the support box 500. In the actual assembly process, the inner electrode 100 is first placed into the inner cavity of the support box 500, so that the recess 130 on its side is aligned and fitted with the boss 530 on the side wall of the support box 500, and the spring piece 120 on the lower surface abuts against the support portion 520. Then, one end of the mounting shaft 420 and one end of the spring piece 430 in the elastic slider 400 are respectively inserted through... The mounting shaft 420 is inserted into the shaft holes 511 of the support blocks 510 on both sides of the support box 500, and then placed into the first groove 110 of the inner electrode 100, at which point the insulating sheet 410 is positioned on the side of the first groove 110. Next, the elastic element 300 is inserted into the corresponding spring hole, completing the pre-compression assembly of the inner electrode 100 and the outer electrode 200. Finally, the non-metallic support block (second part 220) of the outer electrode 200 is embedded into the top recess 540 of the support box 500, and sealed and fixed by ultrasonic welding. The entire structure is in a "conductive" state at room temperature, exhibiting low contact resistance and high mechanical stability.

[0041] When an abnormal temperature rise occurs during cell operation (e.g., a local temperature exceeding 85°C), heat is rapidly conducted through the tabs to the elastic element 300 and spring segment 432, which respond almost simultaneously: the elastic element 300 elongates, pushing the inner tab 100 downwards, causing the hemispherical protrusion 212 and hemispherical concave point 140 to disengage; simultaneously, the spring segment 432 elongates, pulling the insulating sheet 410 into the gap between the inner and outer tabs 200. This dual action ensures the electrical connection is completely severed. Once the fault is cleared and the temperature drops below 85°C, the SMA material reverts to the martensitic phase, and the elastic restoring force causes the elastic element 300 and spring segment 432 to contract, resetting the inner tab 100 and returning the insulating sheet 410 to its first position. The system automatically resumes conduction without manual intervention.

[0042] In summary, this invention constructs a cell tab structure that combines high safety and high reliability. It can not only respond to abnormal temperature rises within milliseconds and achieve automatic power-off and electrical isolation, but also has multiple advantages such as self-recovery, vibration resistance, short circuit prevention, and space saving. It is particularly suitable for application scenarios with extremely high requirements for battery safety performance, such as electric vehicles and energy storage power stations.

[0043] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A battery cell tab structure, characterized in that, include: Inner pole ear (100); Outer tab (200), the lower surface of which abuts against the upper surface of the inner tab (100); An elastic element (300) is disposed between the inner electrode (100) and the outer electrode (200), with one end of the elastic element (300) abutting against the inner electrode (100) and the other end of the elastic element (300) abutting against the outer electrode (200); The elastic slider (400) includes an insulating sheet (410) that can slide between a first position and a second position. The first position is located outside the inner electrode (100) and the outer electrode (200), and the second position is located between the inner electrode (100) and the outer electrode (200). The length of the elastic element (300) is affected by temperature. When the temperature of the elastic element (300) is greater than a threshold, the elastic element (300) elongates, the lower surface of the outer tab (200) separates from the upper surface of the inner tab (100), and the insulating sheet (410) slides from the first position to the second position.

2. The battery cell tab structure according to claim 1, characterized in that, The sliding direction of the insulating sheet (410) is perpendicular to the separation direction of the outer tab (200) and the inner tab (100).

3. The battery cell tab structure according to claim 1, characterized in that, The upper surface of the inner electrode (100) is provided with a first groove (110), the lower surface of the outer electrode (200) is provided with a second groove (211), the elastic slider (400) further includes a mounting shaft (420), the mounting shaft (420) is installed in the receiving space formed by the first groove (110) and the second groove (211), and the insulating sheet (410) can slide along the length direction of the mounting shaft (420).

4. The battery cell tab structure according to claim 3, characterized in that, The insulating sheet (410) is provided with a plurality of spring sheets (430). Each spring sheet (430) includes a spring segment (431), a spring segment (432), and a heat transfer shaft (433). The spring segment (431) is fixedly connected to the insulating sheet (410). One end of the spring segment (432) is connected to the spring segment (431), and the other end of the spring segment (432) is connected to the heat transfer shaft (433). The heat transfer shaft (433) passes through the spring segment (432) and is inserted into the mounting shaft (420).

5. The battery cell tab structure according to claim 3, characterized in that, It also includes a support box (500), the inner electrode (100) is disposed in the inner cavity of the support box (500), a plurality of support blocks (510) are disposed in the inner cavity of the support box (500), the support blocks (510) are provided with shaft holes (511), and the mounting shaft (420) is installed in the shaft holes (511).

6. The battery cell tab structure according to claim 5, characterized in that, The support box (500) has support portions (520) at both ends along its length, and the lower surface of the inner electrode (100) is provided with a spring piece (120), which abuts against the support portion (520).

7. The battery cell tab structure according to claim 5, characterized in that, The inner tab (100) has a recess (130) on its side, and the inner wall of the support box (500) has a boss (530) on its side wall. The recess (130) and the boss (530) are in a concave-convex fit.

8. The battery cell tab structure according to claim 5, characterized in that, The outer tab (200) includes a first part (210) and a second part (220) connected to each other. The first part (210) is made of metal and the second part (220) is made of non-metal. The second part (220) is wrapped around the outer periphery of the first part (210). The top of the support box (500) is provided with a recess (540) and the second part (220) is disposed in the recess (540).

9. The battery cell tab structure according to claim 1, characterized in that, The lower surface of the outer electrode (200) and the upper surface of the inner electrode (100) are provided with a plurality of hemispherical concave points (140) and a plurality of hemispherical convex points (212), and the hemispherical concave points (140) and the hemispherical convex points (212) are provided with a concave-convex fit.

10. A battery, characterized in that, The battery cell tab structure includes any one of claims 1-9.

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