A connecting mechanism and a battery

Abstract

The utility model discloses a kind of connecting mechanism and battery.The connecting mechanism is applied to the connection between pole core assembly and the cover plate component of battery, and the connecting mechanism includes connecting component, pole core assembly includes at least one pole core, the length direction of pole core assembly is formed end face in both ends, the lug of pole core is led out from end face, and at least part of connecting component is attached to end face;Cover plate component and connecting component are mutually spaced in the length direction of pole core assembly, and the part of lug that exposes pole core is bent and clamped between cover plate component and connecting component.The effective volume for accommodating battery inside electric core is created for the condition of improving the energy density of battery.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, and in particular relates to a connection mechanism and a battery. Background Technology

[0002] In the research and development and production of lithium batteries, continuously optimizing the structure to improve energy density is a key direction to meet the market's demand for high-performance batteries. In existing technologies, when assembling the cover plate and cell tabs of lithium batteries, the tabs are generally bent after being connected to the cover plate, so that the cover plate and aluminum shell can be easily fastened together. This assembly method requires a large allowance to accommodate the bending radius of the tabs, resulting in an additional longitudinal gap at the end of the cell, which reduces the effective internal volume of the battery and restricts further improvement of the energy density of lithium batteries. Utility Model Content

[0003] The technical problem this invention aims to solve is as follows: In the existing technology, when assembling the cover plate and cell tabs of lithium batteries, the tabs are generally bent after being connected to the cover plate to allow the cover plate to be smoothly fastened to the aluminum shell. This assembly method requires a large allowance for the bending radius of the tabs, resulting in an additional longitudinal gap at the end of the cell, reducing the effective internal volume of the battery, and restricting further improvement of the energy density of lithium batteries. This invention provides a connection mechanism and a battery.

[0004] To address the aforementioned issues, this utility model provides a connecting mechanism for connecting a core assembly and a battery cover assembly. The connecting mechanism includes a connecting component, the core assembly includes at least one core, both ends of the core assembly along its length are formed end faces, the tabs of the core extend from the end faces, and at least a portion of the connecting component is attached to the end faces. The cover plate assembly and the connecting assembly are spaced apart from each other along the length of the electrode core assembly, and the portion of the electrode tab that exposes the electrode core is bent and clamped between the cover plate assembly and the connecting assembly.

[0005] Optionally, the connecting assembly includes a main body and a baffle, the main body being provided with a mounting hole, and the baffle being mounted in the mounting hole; At least a portion of the main body is attached to the end face, and the portion of the electrode tab that exposes the electrode core is clamped between the cover plate assembly and the baffle.

[0006] Optionally, the main body is sleeved on the outside of the electrode core assembly, with one end of the main body in the length direction of the electrode core assembly attached to one end face, and the other end of the main body in the length direction of the electrode core assembly attached to another end face.

[0007] Optionally, the main body includes a first connecting plate, a second connecting plate, a third connecting plate, and a fourth connecting plate. The first connecting plate and the third connecting plate are spaced apart from each other in the length direction of the electrode core assembly, and the second connecting plate and the fourth connecting plate are spaced apart from each other in the width direction of the electrode core assembly. The first connecting plate, the second connecting plate, the third connecting plate, and the fourth connecting plate enclose a receiving space. The electrode core assembly is located in the receiving space, and the receiving space penetrates the main body in the thickness direction of the electrode core assembly. The first connecting plate is attached to one end face, and the third connecting plate is attached to the other end face. Both the first connecting plate and the third connecting plate are provided with mounting holes.

[0008] Optionally, the main body includes a first connecting plate, a second connecting plate, a third connecting plate, and a fourth connecting plate. The first connecting plate and the third connecting plate are spaced apart from each other in the length direction of the electrode core assembly, and the second connecting plate and the fourth connecting plate are spaced apart from each other in the thickness direction of the electrode core assembly. The first connecting plate, the second connecting plate, the third connecting plate, and the fourth connecting plate enclose a receiving space. The electrode core assembly is located in the receiving space, and the receiving space penetrates the main body in the width direction of the electrode core assembly. The first connecting plate is attached to one end face, and the third connecting plate is attached to the other end face. Both the first connecting plate and the third connecting plate are provided with mounting holes.

[0009] Optionally, both the first connecting plate and the third connecting plate are provided with through holes, and the electrode tab passes through the through holes.

[0010] Optionally, the electrode core assembly includes two electrode cores stacked along their thickness direction. The main body includes a first connecting plate, a second connecting plate, and a third connecting plate. The first connecting plate and the third connecting plate are spaced apart from each other along the length direction of the electrode core assembly. The second connecting plate connects the first connecting plate and the third connecting plate. The second connecting plate is sandwiched between the two electrode core assemblies. The first connecting plate is attached to one end face, and the third connecting plate is attached to the other end face. Both the first connecting plate and the third connecting plate are provided with mounting holes. Optionally, the main body includes a first connecting plate, a second connecting plate, a third connecting plate, and a fourth connecting plate. The first connecting plate and the third connecting plate are spaced apart from each other in the width direction of the core assembly, and the second connecting plate and the fourth connecting plate are spaced apart from each other in the thickness direction of the core assembly. The first connecting plate, the second connecting plate, the third connecting plate, and the fourth connecting plate together form the mounting hole.

[0011] Optionally, a first clearance groove is formed between the first connecting plate, the second connecting plate and the third connecting plate, and a second clearance groove is formed between the first connecting plate, the third connecting plate and the fourth connecting plate. Both the first clearance groove and the second clearance groove are used to allow the tab to pass through.

[0012] According to the connecting mechanism provided in this embodiment, the connecting component is fitted and installed on the end face of the electrode core assembly to form a rigid support structure. The portion of the electrode tab extending from the end face of the electrode core is bent so that it naturally adheres to the surface of the connecting component. Through the spacing design between the connecting component and the cover plate assembly in the length direction of the electrode core, the bent electrode tab is clamped between the two, realizing the electrical connection and mechanical fixation between the electrode tab and the cover plate assembly. The traditional method involves first connecting the electrode tab to the cover plate assembly, and then bending the electrode tab to connect the cover plate assembly to the battery casing. This connection method requires a large longitudinal clearance to be reserved for the bending radius of the electrode tab. This application directly attaches the electrode core end face to the connecting component, and bends and clamps the exposed part of the electrode core of the tab between the cover plate assembly and the connecting component. This allows the tab of this application to be bent and attached to the connecting component first, and then connected to the cover plate. This eliminates the longitudinal gap reserved for the bending radius of the tab in the traditional process, greatly reduces the extra longitudinal gap at the end of the electrode core, and increases the effective volume inside the battery that can accommodate the cell, creating conditions for improving energy density (accommodating more active materials in the same volume).

[0013] This utility model provides a battery including a housing, a cover assembly, and the aforementioned connecting mechanism. The housing has a storage space, the electrode core assembly is disposed in the storage space, the cover assembly covers the housing, the cover assembly and the connecting assembly are spaced apart from each other in the length direction of the electrode core assembly, and the portion of the electrode tab that exposes the electrode core is bent and clamped between the cover assembly and the connecting assembly. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is an exploded view of a battery provided in one embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a battery provided in one embodiment of the present invention; Figure 3 yes Figure 2 A schematic diagram of the internal structure cut along line AA; Figure 4 yes Figure 3 A magnified view of A; Figure 5 This is a schematic diagram of the main body of the connecting mechanism provided in one embodiment of the present utility model; Figure 6 This is a schematic diagram showing the connection relationship between the main body of the connecting mechanism and the pole core assembly in one embodiment of this utility model; Figure 7 This is a schematic diagram of the main body of the connecting mechanism provided in another embodiment of the present utility model; Figure 8 This is a schematic diagram showing the connection relationship between the main body of the connecting mechanism and the pole core assembly provided in another embodiment of the present invention; Figure 9 This is a schematic diagram of the main body of the connecting mechanism provided in another embodiment of the present utility model; Figure 10 This is a schematic diagram showing the connection relationship between the main body of the connecting mechanism and the pole core assembly provided in another embodiment of the present invention; Figure 11 This is a schematic diagram of the main body of the connecting mechanism provided in another embodiment of the present utility model; Figure 12 This is a schematic diagram showing the connection relationship between the main body of the connecting mechanism and the pole core assembly provided in another embodiment of the present invention.

[0016] The reference numerals in the accompanying drawings are as follows: 10. Housing; 101. Storage space; 20. Insulating film; 30. Electrode cap; 1. Core assembly; 11. Core; 111. Tab; 2. Cover plate assembly; 21. Busbar; 3. Connecting components; 31. Main body; 311. First connecting plate; 312. Second connecting plate; 313. Third connecting plate; 314. Fourth connecting plate; 32. Baffle; 33. Mounting hole; 34. Accommodation space; 35. Through hole; 36. First clearance groove; 37. Second clearance groove. Detailed Implementation

[0017] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0018] In the description of this utility model, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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.

[0020] like Figures 1 to 12 As shown, an embodiment of the present invention provides a connection mechanism for connecting the electrode core assembly 1 and the cover plate assembly 2 of the battery. The connection mechanism includes a connection component 3. The electrode core assembly 1 includes at least one electrode core 11. Both ends of the electrode core assembly 1 in the length direction form end faces. The electrode tabs 111 of the electrode core 11 are led out from the end faces. At least a portion of the connection component 3 is attached to the end faces.

[0021] The cover plate assembly 2 and the connecting assembly 3 are spaced apart from each other along the length of the electrode core assembly 1. The exposed portion of the electrode core 11 of the tab 111 is bent and clamped between the cover plate assembly 2 and the connecting assembly 3. In the conventional process, during battery manufacturing, the connection process between the tab 111 and the cover plate assembly 2 is "first directly connecting the tab 111 to the cover plate assembly 2 (such as welding), and then bending the tab 111 as a whole to make the cover plate and the housing 10 fasten together." In this process, the tab 111 will form a fixed bending radius when bent (determined by material properties and bending process, and cannot be reduced indefinitely), and the bent tab 111 needs to be offset as a whole towards the end face of the electrode core assembly 1 to avoid interference with the housing 10. To ensure that the tab 111 is not excessively stretched or torn during bending, or that it does not collide with other structures of the core assembly 1 or the inner wall of the housing 10 after bending, a sufficiently large longitudinal gap (along the length of the core assembly 1) must be reserved between the end of the core assembly 1 and the cover plate. This gap must cover the arc length space and offset distance corresponding to the bending radius of the tab 111. If the gap is insufficient, the tab 111 may be damaged due to excessive bending force, or the cover plate may not be able to be fastened smoothly. Therefore, "reserving a large clearance" is a forced design choice in traditional processes. In this application, during the battery manufacturing process, the part of the tab 111 exposed to the core 11 is first bent and attached to the surface of the connecting component 3, and then connected to the cover plate assembly 2. In this application, by adding the connecting component 3, the bent tab 111 naturally attaches to the surface of the connecting component 3. At this time, the tab 111 is supported by the connecting component 3 and will not contact other parts of the core assembly 1. The busbar 21 on the cover plate assembly 2 is placed on the side of the cover plate assembly 2 facing the connecting assembly 3. The tab 111 is connected to the busbar 21 on the cover plate assembly 2 via external laser welding. During welding, the connecting assembly 3 provides support below the tab 111, ensuring that the tab 111 does not deform or shift during the welding process. After welding the tab 111 to the busbar 21, the cover plate assembly 2 and the connecting assembly 3 form a stable structure that clamps the tab 111. The connecting assembly 3 fits against the end face of the electrode core 11 and acts as a support frame to hold the tab 111 below, creating a physical isolation between the tab 111 and the electrode core 11 body. This prevents the tab 111 from contacting the electrode core 11 due to deformation or displacement after bending, structurally eliminating the safety hazard of a short circuit between the tab 111 and the electrode core 11, and improving battery safety. Compared to the large-angle (far greater than 90°, some approaching 180°) and large-radius bending required in traditional processes to avoid the casing 10 or to achieve side-by-side assembly of the electrode cores 11, the height space occupied after bending (perpendicular to the length of the electrode core 11) is significantly reduced. This reduces the encroachment of the tabs 111 on the internal space of the battery, significantly improving the energy density and production reliability of the battery. In this application, the tabs 111 are first bent and attached to the surface of the connecting component 3. At this time, the bending angle is only 90° (instead of the traditional large angle), and the bent tabs 111 are supported by the connecting component 3, with a fixed shape (no additional offset requirement).This application allows the tab 111 to be bent before being connected to the cover assembly 2, and the bending shape is fixed by the connecting assembly 3, avoiding the redundant clearance space required by the traditional "bending after connection". The gap between the cover assembly 2 and the connecting assembly 3 only needs to match the "thickness of the tab 111 after bending", and there is no need to reserve space for the "arc length corresponding to the bending radius of the tab 111" - because the tab 111 has been bent and supported in advance, there is no need to reserve redundant gap between the cover and the end of the core 11 for the "subsequent bending action". The connecting assembly 3 fits against the end face of the core 11 and supports the tab 111, so that the tab 111 does not need to be offset towards the end of the core 11 after bending, completely eliminating the two longitudinal gaps that must be reserved in the traditional process: "arc length space corresponding to the bending radius" and "offset distance". The focus of this application is on the structural connection relationship between the core assembly 1, the connecting assembly 3 and the cover assembly 2 of the battery. The size of the connecting assembly 3 can be adaptively adjusted according to the longitudinal gap size of different batteries. By compressing the longitudinal gap and reducing ineffective space, this application increases the effective internal volume of the battery, structurally breaking through the limitations of traditional processes on energy density and directly solving the problem of "difficulty in improving energy density due to clearance space (longitudinal gap)". At the same time, the connecting component 3 is supported below the tab 111, and there is no need to penetrate the connecting component 3 when using external laser welding, avoiding the damage to the electrode core component 1 caused by traditional penetration welding.

[0022] like Figure 1 , Figure 3 and Figure 4 As shown, in one embodiment, the connecting component 3 includes a main body 31 and a baffle 32. The main body 31 is provided with a mounting hole 33, and the baffle 32 is installed in the mounting hole 33.

[0023] At least a portion of the main body 31 is attached to the end face, and the exposed portion of the electrode core 11 of the tab 111 is clamped between the cover plate assembly 2 and the baffle 32. In this embodiment, the connecting assembly 3 is composed of the main body 31 and the baffle 32, and can achieve functional complementarity through material differentiation design. The main body 31 is made of plastic, which can utilize the insulating properties of plastic to prevent the electrode core assembly 1 from forming a conductive path with external metal parts. At the same time, the plastic material is lightweight and easy to process, and can fit tightly to the end face of the electrode core 11, providing stable support for the overall structure. The baffle 32 is installed in the mounting hole 33 of the main body 31 and is made of metal. With the rigidity and high temperature resistance of metal, it forms a reliable physical barrier when the tab 111 and the busbar 21 of the cover plate assembly 2 are laser welded, effectively blocking laser penetration and preventing the laser from directly irradiating the electrode core assembly 1, fundamentally preventing the electrode core 11 from being affected by laser damage, thus preventing performance impact or safety hazards. At the same time, the baffle 32 is installed in the mounting hole 33 of the main body 31, and the overall structure is compact, without occupying additional longitudinal space at the end of the electrode core assembly 1. The plastic material of the main body 31 reduces the volume of the connecting component 3 itself, freeing up more effective space for the core component 1, which helps to increase the amount of active material and improve the battery energy density.

[0024] like Figure 5-6 , Figure 9-10 As shown, in one embodiment, the main body 31 is sleeved on the outside of the electrode core assembly 1. One end of the main body 31 along the length of the electrode core assembly 1 is attached to one end face, and the other end of the main body 31 along the length of the electrode core assembly 1 is attached to the other end face. In this embodiment, simply sleeved on the outside of the electrode core assembly 1 completes the relative fixation of the electrode core assembly 1 and the connecting assembly 3, eliminating the need for separate fitting and adjustment of the two end faces. This reduces assembly steps, lowers positioning errors, and facilitates standardized operations for subsequent steps such as bending the electrode tab 111 and connecting the cover plate assembly 2, thereby improving production efficiency and product yield.

[0025] like Figure 5-6As shown, in one embodiment, the main body 31 includes a first connecting plate 311, a second connecting plate 312, a third connecting plate 313, and a fourth connecting plate 314. The first connecting plate 311 and the third connecting plate 313 are spaced apart from each other in the length direction of the core assembly 1, and the second connecting plate 312 and the fourth connecting plate 314 are spaced apart from each other in the width direction of the core assembly 1. The first connecting plate 311, the second connecting plate 312, the third connecting plate 313, and the fourth connecting plate 314 enclose a receiving space 34, and the core assembly 1 is located in the receiving space 34. The receiving space 34 penetrates the main body 31 in the thickness direction of the core assembly 1. The first connecting plate 311 is attached to one end face, and the third connecting plate 313 is attached to the other end face. Both the first connecting plate 311 and the third connecting plate 313 are provided with mounting holes 33. In this embodiment, the accommodating space 34 extends through the main body 31 in the thickness direction of the electrode core assembly 1, avoiding the addition of redundant structures in the thickness direction and not occupying additional space in the thickness direction of the electrode core assembly 1, thus making more efficient use of the internal space of the battery. Moreover, compared with the overall closed main body 31, the structure of each connecting plate enclosing the electrode core assembly 1 can reduce the use of its own materials and reduce the volume ratio of structural components while ensuring the limiting effect on the electrode core assembly 1, freeing up more space to increase the filling amount of active material, which is conducive to improving the energy density of the battery.

[0026] like Figure 9-10 As shown, in one embodiment, the main body 31 includes a first connecting plate 311, a second connecting plate 312, a third connecting plate 313, and a fourth connecting plate 314. The first connecting plate 311 and the third connecting plate 313 are spaced apart from each other in the length direction of the core assembly 1, and the second connecting plate 312 and the fourth connecting plate 314 are spaced apart from each other in the thickness direction of the core assembly 1. The first connecting plate 311, the second connecting plate 312, the third connecting plate 313, and the fourth connecting plate 314 enclose a receiving space 34, and the core assembly 1 is located in the receiving space 34. The receiving space 34 penetrates the main body 31 in the width direction of the core assembly 1. The first connecting plate 311 is attached to one end face, and the third connecting plate 313 is attached to the other end face. Both the first connecting plate 311 and the third connecting plate 313 are provided with mounting holes 33. In this embodiment, the accommodating space 34 extends through the main body 31 in the width direction of the electrode core assembly 1, avoiding the addition of redundant structures in the thickness direction and not occupying additional space in the thickness direction of the electrode core assembly 1, thus making more efficient use of the internal space of the battery. Moreover, compared with the overall closed main body 31, the structure of each connecting plate enclosing the electrode core assembly 1 can reduce the use of its own materials and reduce the volume ratio of structural components while ensuring the limiting effect on the electrode core assembly 1, freeing up more space to increase the filling amount of active material, which is conducive to improving the energy density of the battery.

[0027] like Figure 9-10As shown, in one embodiment, both the first connecting plate 311 and the third connecting plate 313 are provided with through holes 35, through which the tab 111 passes. In this embodiment, after the tab 111 passes through the through hole 35, the through hole 35 can constrain the tab 111 radially, preventing the tab 111 from shifting laterally during bending, welding, and battery use. This ensures that the tab 111 is always in the preset welding position, reducing welding defects caused by tab 111 misalignment, thereby improving the stability of the connection between the tab 111 and the busbar 21 of the cover plate assembly 2, and ensuring the electrical performance of the battery.

[0028] like Figure 7-8 As shown, in one embodiment, the electrode assembly 1 includes two electrode cores 11, which are stacked along their thickness direction. The main body 31 includes a first connecting plate 311, a second connecting plate 312, and a third connecting plate 313. The first connecting plate 311 and the third connecting plate 313 are spaced apart from each other along the length direction of the electrode assembly 1. The second connecting plate 312 is connected between the first connecting plate 311 and the third connecting plate 313. The second connecting plate 312 is clamped between the two electrode core assemblies 1. The first connecting plate 311 is attached to one end face, and the third connecting plate 313 is attached to the other end face. Both the first connecting plate 311 and the third connecting plate 313 are provided with mounting holes 33. In this embodiment, the second connecting plate 312 is clamped between the two electrode cores 11, and the first connecting plate 311 and the third connecting plate 313 are respectively attached to the two end faces of the electrode assembly 1, forming a three-dimensional fixing structure of "limiting at both ends + clamping in the middle". The two superimposed electrode cores 11 can be constrained simultaneously from the length direction (through the first and third connecting plates 313) and the thickness direction (through the second connecting plate 312) of the electrode core 11, thus ensuring the stability of the internal structure of the battery.

[0029] like Figure 11-12 As shown, in one embodiment, the main body 31 includes a first connecting plate 311, a second connecting plate 312, a third connecting plate 313, and a fourth connecting plate 314. The first connecting plate 311 and the third connecting plate 313 are spaced apart from each other in the width direction of the core assembly 1, and the second connecting plate 312 and the fourth connecting plate 314 are spaced apart from each other in the thickness direction of the core assembly 1. The first connecting plate 311, the second connecting plate 312, the third connecting plate 313, and the fourth connecting plate 314 enclose each other to form a mounting hole 33. In this embodiment, the four connecting plates enclose the mounting hole 33, resulting in a compact structure. This eliminates the need for redundant structures in the width and thickness directions of the core assembly 1, reducing the space occupied inside the battery. Furthermore, compared to a closed block structure, this enclosed structure reduces the amount of material used and lowers its volume ratio, leaving more space for the active material in the core assembly 1, which is beneficial for improving the energy density of the battery.

[0030] like Figure 11-12As shown, in one embodiment, a first clearance groove 36 is formed between the first connecting plate 311, the second connecting plate 312, and the third connecting plate 313, and a second clearance groove 37 is formed between the first connecting plate 311, the third connecting plate 313, and the fourth connecting plate 314. Both the first clearance groove 36 and the second clearance groove 37 are used for the tab 111 to pass through. In this embodiment, the clearance groove provides a dedicated channel for the tab 111, allowing the tab 111 to be arranged compactly along a preset path, avoiding the occupation of extra space due to the arbitrary extension of the tab 111. Compared with the space waste caused by the non-directional extension of the tab 111 in the traditional process, this structured clearance design makes the space occupied by the tab 111 in the thickness and width directions more controllable. Combined with the compact structure of the main body 31, it further releases the effective volume inside the battery, freeing up more space for filling active materials and helping to improve energy density.

[0031] According to the connection mechanism provided in this embodiment of the utility model, the connection component 3 is fitted and installed on the end face of the electrode core component 1 to form a rigid support structure. The portion of the tab 111 extending from the end face of the electrode core 11 is bent so that it naturally adheres to the surface of the connection component 3. Through the spacing design between the connection component 3 and the cover plate component 2 in the length direction of the electrode core 11, the bent tab 111 is clamped between the two, realizing the electrical connection and mechanical fixation between the tab 111 and the cover plate component 2. The conventional method uses the tab 111 to connect to the cover plate component 2 first, and then the tab 111 is bent to realize the connection between the cover plate component 2 and the battery casing 10. This connection method requires a large longitudinal clearance to be reserved for the bending radius of the tab 111. This application directly attaches the connecting component 3 to the end face of the electrode core 11, and bends and clamps the exposed part of the electrode core 11 between the cover plate component 2 and the connecting component 3. This allows the electrode tab 111 of this application to be bent and attached to the connecting component 3 first, and then connected to the cover plate. This eliminates the longitudinal gap reserved for the bending radius of the electrode tab 111 in the traditional process, greatly reduces the additional longitudinal gap at the end of the electrode core 11, and increases the effective volume inside the battery that can accommodate the cell, creating conditions for improving energy density (accommodating more active materials in the same volume).

[0032] like Figure 1-4As shown, this utility model embodiment also provides a battery, including a housing 10, a cover assembly 2, and a connection mechanism as described in the above embodiment. The housing 10 has a storage space 101, and the electrode core assembly 1 is disposed in the storage space 101. The cover assembly 2 covers the housing 10, and the cover assembly 2 and the connection assembly 3 are spaced apart from each other in the length direction of the electrode core assembly 1. The exposed portion of the electrode core 11 of the tab 111 is bent and clamped between the cover assembly 2 and the connection assembly 3. In the battery manufacturing process, the following steps are included: first, multiple electrode cores 11 are combined to form the electrode core assembly 1, so that the end faces of the electrode cores 11 (lead-out ends of the tabs 111) are aligned; the tab 111 support frame (connection assembly 3) is installed, so that it is at least partially attached to the end face of the electrode core assembly 1, and the tab 111 passes through the through hole 35 or the clearance groove of the support frame. At this time, the support frame forms a rigid support for the bottom of the tab 111, isolating the tab 111 from the electrode core 11 body. Next, the entire core assembly 1 with the support frame installed is wrapped with an insulating film 20 to further enhance insulation protection. The core assembly 1 (including the support frame) wrapped with the insulating film 20 is then placed into the storage space 101 of the aluminum shell (shell 10) to ensure that the core assembly 1 is stably placed within the shell 10. Finally, the bent tab 111 is connected to the busbar 21 on the cover plate assembly 2 by external laser welding (the welding is more stable because the tab 111 is supported by the support frame below). The tab cap 30 is welded to complete the sealing and final fixation of the battery. In traditional processes, the tab 111 needs to be bent after being connected to the cover plate to avoid the aluminum shell, which forces a large longitudinal gap to be reserved for the bending radius, resulting in a high proportion of ineffective space at the end of the cell. In this solution, the connecting component 3 fits against the end face of the core 11, and the cover plate assembly 2 and the connecting component 3 are spaced apart. The tab 111 only needs to be bent and clamped between the two – there is no need to reserve redundant space for the "bending radius of the tab 111", only the minimum gap required for clamping is retained. This design directly compresses the extra longitudinal gap at the end of the cell, significantly increasing the effective volume inside the battery that can accommodate active materials. More positive and negative electrode materials can be filled within the same casing size 10, fundamentally breaking through the structural constraints on energy density improvement. Below the tab 111, there is a connecting component 3 (such as a support frame) as rigid support, preventing the tab 111 from directly contacting the electrode core 11 body. This physically blocks the path of short circuit between the tab 111 and the electrode core 11, solving the safety risk of the tab 111 easily loosening and contacting the electrode core 11 after traditional bending, leading to a short circuit. The tab 111 uses "clamping and fixing" instead of "connecting before bending", reducing the tensile and tearing damage of the tab 111 during the bending process, and reducing the hidden dangers of leakage and thermal runaway caused by the breakage of the tab 111. The tab 111 only needs to be bent at a small angle (such as 90°) to connect with the cover busbar 21, with less bending stress, reducing the probability of fatigue fracture of the tab 111, and improving the reliability of the battery in long-term use. Meanwhile, the connecting component 3 of this application not only serves to support the tab 111, but also achieves insulation and isolation through clamping with the cover plate component 2, which can directly eliminate the plastic protrusion under the cover plate.This change reduces the space occupied by the structural components themselves, indirectly increasing the effective internal volume of the battery. This, combined with the "compressed longitudinal gap," creates a synergistic effect, further improving energy density.

[0033] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this 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 of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A connecting mechanism applied to connection between a core assembly and a cover assembly of a battery, characterized by, The connecting mechanism includes a connecting component, the pole core component includes at least one pole core, both ends of the pole core component in the longitudinal direction form end faces, the pole tabs of the pole core extend out from the end faces, and at least a portion of the connecting component is attached to the end faces; The cover plate assembly and the connecting assembly are spaced apart from each other along the length of the electrode core assembly, and the portion of the electrode tab that exposes the electrode core is bent and clamped between the cover plate assembly and the connecting assembly.

2. The connection mechanism of claim 1, wherein The connecting component includes a main body and a baffle. The main body is provided with a mounting hole, and the baffle is installed in the mounting hole. At least a portion of the main body is attached to the end face, and the portion of the electrode tab that exposes the electrode core is clamped between the cover plate assembly and the baffle.

3. The connection mechanism of claim 2, wherein, The main body is sleeved on the outside of the electrode core assembly, with one end of the main body in the length direction of the electrode core assembly attached to one end face, and the other end of the main body in the length direction of the electrode core assembly attached to another end face.

4. The connection mechanism of claim 3, wherein The main body includes a first connecting plate, a second connecting plate, a third connecting plate, and a fourth connecting plate. The first connecting plate and the third connecting plate are spaced apart from each other in the length direction of the electrode core assembly, and the second connecting plate and the fourth connecting plate are spaced apart from each other in the width direction of the electrode core assembly. The first connecting plate, the second connecting plate, the third connecting plate, and the fourth connecting plate enclose a receiving space. The electrode core assembly is located in the receiving space, and the receiving space penetrates the main body in the thickness direction of the electrode core assembly. The first connecting plate is attached to one end face, and the third connecting plate is attached to the other end face. Both the first connecting plate and the third connecting plate are provided with mounting holes.

5. The connection mechanism of claim 3, wherein The main body includes a first connecting plate, a second connecting plate, a third connecting plate, and a fourth connecting plate. The first connecting plate and the third connecting plate are spaced apart from each other in the length direction of the electrode core assembly, and the second connecting plate and the fourth connecting plate are spaced apart from each other in the thickness direction of the electrode core assembly. The first connecting plate, the second connecting plate, the third connecting plate, and the fourth connecting plate enclose a receiving space. The electrode core assembly is located in the receiving space, and the receiving space penetrates the main body in the width direction of the electrode core assembly. The first connecting plate is attached to one end face, and the third connecting plate is attached to the other end face. Both the first connecting plate and the third connecting plate are provided with mounting holes.

6. The connection mechanism of claim 5, wherein, Both the first connecting plate and the third connecting plate are provided with through holes, and the electrode tab passes through the through holes.

7. The attachment mechanism of claim 2, wherein, The electrode core assembly includes two electrode cores stacked along their thickness direction. The main body includes a first connecting plate, a second connecting plate, and a third connecting plate. The first connecting plate and the third connecting plate are spaced apart from each other along the length direction of the electrode core assembly. The second connecting plate is connected between the first connecting plate and the third connecting plate. The second connecting plate is clamped between the two electrode core assemblies. The first connecting plate is attached to one end face, and the third connecting plate is attached to the other end face. Both the first connecting plate and the third connecting plate are provided with mounting holes.

8. The attachment mechanism of claim 2, wherein, The main body includes a first connecting plate, a second connecting plate, a third connecting plate, and a fourth connecting plate. The first connecting plate and the third connecting plate are spaced apart from each other in the width direction of the core assembly, and the second connecting plate and the fourth connecting plate are spaced apart from each other in the thickness direction of the core assembly. The first connecting plate, the second connecting plate, the third connecting plate, and the fourth connecting plate together form the mounting hole.

9. The connection mechanism of claim 8, wherein, A first clearance groove is formed between the first connecting plate, the second connecting plate and the third connecting plate, and a second clearance groove is formed between the first connecting plate, the third connecting plate and the fourth connecting plate. Both the first clearance groove and the second clearance groove are used for the electrode tab to pass through.

10. A battery, characterized by The device includes a housing, a cover assembly, and a connecting mechanism as described in any one of claims 1 to 9. The housing has a storage space, the electrode core assembly is disposed in the storage space, the cover assembly covers the housing, the cover assembly and the connecting assembly are spaced apart from each other in the length direction of the electrode core assembly, and the portion of the electrode tab that exposes the electrode core is bent and clamped between the cover assembly and the connecting assembly.

Images