Case structure and battery device

Abstract

The utility model relates to battery technology field, concretely relates to a casing structure and battery device, the casing structure includes: the cover plate is seted up with the mounting hole, the connecting plate is set in the mounting hole, the one side of connecting plate and the cover plate weld and form the first weld line, the other side of connecting plate extends to the center of mounting hole, be provided with the installation area on the connecting plate, the pole post subassembly is set up on the installation area, the penetration of first weld line is Hmm, along the horizontal direction, the distance between the center of first weld line and the other side of connecting plate is L1mm, the ratio between the penetration of first weld line and the distance between the center of first weld line and the other side of connecting plate is H / L1, the embodiment will limit the ratio H / L1 in certain range, can make the penetration have enough depth, thereby improve the structural strength of connecting plate and cover plate, can resist a part of external tensile force to connecting plate, thereby avoid the fracture of weld line. Meanwhile, can also reserve enough space to install pole post subassembly.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a housing structure and a battery device. Background Technology

[0002] Currently, traditional casing structures typically include poles and cover plates, and these are generally connected using laser welding. However, during the actual welding process, because the edge gaps between the poles and cover plates need to be welded, if these gaps are not aligned, light leakage can occur. This means the laser can directly penetrate the gap and damage the insulation components or battery cells inside the cover plate, leading to insulation failure or battery cell failure.

[0003] Therefore, some batteries have an additional connecting plate between the cover and the terminal post, so that there is an overlap between the connecting plate and the cover and the terminal post, which can prevent the laser from passing directly through the gap during laser welding.

[0004] However, the connecting plate has weak structural strength and is at risk of breaking during use. Utility Model Content

[0005] In view of this, the present invention provides a housing structure and a battery device to solve the problem that the connecting plate has weak structural strength and is at risk of breakage during use.

[0006] In a first aspect, this utility model provides a shell structure, which includes: The cover plate has mounting holes; A connecting plate is disposed in the mounting hole; one side of the connecting plate is welded to the cover plate to form a first weld line; the other side of the connecting plate extends toward the center of the mounting hole; a mounting area is provided on the connecting plate; The pole assembly is located in the mounting area; The penetration depth of the first weld wire is H mm. The distance between the center of the first weld wire and the other side of the connecting plate in the horizontal direction is L1 mm. The ratio between the penetration depth of the first weld wire and the distance between the center of the first weld wire and the other side of the connecting plate is H / L1, where H / L1 satisfies: 0.04~0.11.

[0007] Beneficial effects: This embodiment limits the ratio H / L1 within a certain range, ensuring sufficient weld penetration and thus improving the structural strength of the connecting plate and cover plate. This allows the connecting plate to withstand some of the external tensile force, preventing weld wire breakage. Simultaneously, sufficient space is reserved for installing the pole assembly, preventing the connecting plate from being too short to properly accommodate it. If the ratio is too large, the weld wire will be too strong while the cantilever will be too short, meaning the connecting plate will be too short to accommodate the pole assembly. If the ratio is too small, the cantilever will be too long, meaning the connecting plate will be too long, making the connecting plate prone to bending and resulting in insufficient weld wire strength, which can easily cause the first weld wire to crack.

[0008] Secondly, this utility model also provides a battery device, which includes: The housing structure of any of the above embodiments has an internal receiving cavity; The battery cell is housed within a cavity; the battery cell is connected to the terminal assembly within the housing structure. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this utility model, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the overall structure of the battery in an embodiment of this utility model; Figure 2 This is a schematic diagram of the battery explosion in an embodiment of this utility model; Figure 3 This is a schematic diagram of the connecting plate in an embodiment of the present utility model; Figure 4 This is a cross-sectional view of the battery along its length in an embodiment of this utility model; Figure 5 for Figure 4 An enlarged diagram in Part A; Figure 6 for Figure 5 Enlarged diagram in Part B; Figure 7 for Figure 6 A parameter annotation diagram of some components; Figure 8 for Figure 6 The parameter annotation diagram for another part of the components.

[0011] Explanation of reference numerals in the attached figures: 1. Cover plate; 11. Mounting holes; 2. Connecting plate; 21. Mounting area; 3. First welding line; 4. Terminal assembly; 41. Terminal body; 42. Overlapping part; 43. Pressure ring; 44. Abutting part; 5. Second welding line. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0013] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0014] 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; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0015] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0016] Currently, traditional battery casings typically include terminals and a cover plate 1, usually connected by laser welding. However, during the actual welding process, because the edge gaps between the terminals and the cover plate 1 need to be welded, if the gaps are not aligned, light leakage can occur. This means the laser can directly pass through the gaps and damage the insulation components or battery cells inside the cover plate 1, leading to insulation or cell failure. Therefore, some batteries incorporate a connecting plate 2 between the cover plate 1 and the terminals, creating overlap between the connecting plate 2 and both the cover plate 1 and the terminals. This prevents the laser from directly passing through the gaps during welding. However, this connecting plate 2 has relatively weak structural strength and carries the risk of breakage during use.

[0017] In view of this, the present invention provides a housing structure and a battery device to solve the problem that the connecting plate 2 has weak structural strength and is at risk of breaking during use.

[0018] The following is combined Figures 1 to 8 The following describes embodiments of the present invention.

[0019] According to an embodiment of the present invention, a housing structure is provided, which includes a cover plate 1, a connecting plate 2, and an pole assembly 4.

[0020] Specifically, in this embodiment, the cover plate 1 has a mounting hole 11, and the wall of the mounting hole 11 has a stepped structure. It can be understood that the cover plate 1 can be an end cap that seals the opening of the battery casing, or it can be one end face of the battery casing, wherein the battery casing can have a structure with one or both openings. Of course, this embodiment is merely an example of the placement of the cover plate 1, but it is not intended to limit the scope. Those skilled in the art can modify it according to actual conditions, as long as the same technical effect is achieved.

[0021] Furthermore, in this embodiment, the connecting plate 2 is disposed in the mounting hole 11, one side of the connecting plate 2 is welded to the cover plate 1 to form a first weld line 3, and the other side of the connecting plate 2 extends toward the center of the mounting hole 11. The connecting plate 2 is provided with a mounting area 21. In addition, the pole post assembly 4 is disposed on the mounting area 21.

[0022] In this embodiment, the pole assembly 4 can be composed of a pressure ring 43 and a pole body 41. The following implementation details the specific connection method between the two. For example, the inner edge of the pressure ring 43 can be riveted to the pole body 41. Then, the entire assembly of the pressure ring 43 and pole body 41 after riveting is placed in the mounting area 21, and the bottom of the outer edge of the pressure ring 43 is connected to the connecting plate 2. The connection between the connecting plate 2 and the pressure ring 43 can be achieved by riveting, bonding, or welding.

[0023] Furthermore, in this embodiment, the connecting plate 2 not only serves to install the pole assembly 4, but also cooperates with the cover plate 1 to prevent the laser from directly passing through the overlapping area between the two, thereby protecting the insulation components and battery cells inside the cover plate 1.

[0024] Furthermore, in this embodiment, the penetration depth of the first weld line 3 is H mm, and the distance between the center of the first weld line 3 and the other side of the connecting plate 2 in the horizontal direction is L1 mm. The ratio between the penetration depth of the first weld line 3 and the distance between the center of the first weld line 3 and the other side of the connecting plate 2 is H / L1, wherein H / L1 satisfies: 0.04 to 0.11.

[0025] For example, the ratio H / L1 can be 0.04, 0.045, 0.5, 0.055, 0.06, 0.065, 0.07, 0.075, 0.08, 0.085, 0.09, 0.095, 0.1, 0.105, 0.11, etc. Of course, this embodiment is merely an example illustrating the specific value of the ratio H / L1, and is not intended to limit it. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0026] By setting the ratio H / L1 within a certain range, this embodiment ensures sufficient weld penetration, thereby increasing the structural strength of the connecting plate 2 and the cover plate 1. This allows the connecting plate 2 to withstand some of the external tensile force, preventing wire breakage. Simultaneously, sufficient space is reserved for installing the pole post assembly 4, preventing the connecting plate 2 from being too short to properly accommodate it. If the ratio is too large, the weld line will be too strong and the cantilever too short, meaning the connecting plate 2 will be too short to accommodate the pole post assembly 4. If the ratio is too small, the cantilever will be too long, meaning the connecting plate 2 will be too long, making the connecting plate 2 prone to bending and resulting in insufficient weld line strength, which can easily cause the first weld line 3 to crack.

[0027] Furthermore, in an optional implementation, Hmm satisfies 0.5mm~1.0mm.

[0028] For example, Hmm can be 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1.0mm, etc. Of course, this embodiment is merely an example of a specific value for Hmm, and is not intended to limit it. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0029] By setting it in this way, the penetration depth of the first welding wire 3 is limited to a certain range in this embodiment, which can ensure that the first welding wire 3 has sufficient bonding force, thereby resisting the tensile force of the connecting plate 2, improving the structural strength of the connecting plate 2 and the cover plate 1, and preventing the welding wire from falling off. If H is too small, the welding strength of the first welding wire 3 will be insufficient, and when the connecting plate 2 is subjected to the tensile force of the pole assembly 4, the welding wire will easily peel off from the cover plate 1, thereby causing the connecting plate 2 to fall off. If H is too large, the laser welding energy will be too high, which will easily weld through the connecting plate 2 or the cover plate 1, thereby easily causing the battery seal to fail.

[0030] Furthermore, in an optional implementation, L1mm satisfies 8mm~15mm.

[0031] For example, L1mm can be 8mm, 8.5mm, 9mm, 9.5mm, 10mm, 10.5mm, 11mm, 11.5mm, 12mm, 12.5mm, 13mm, 13.5mm, 14mm, 14.5mm, 15mm, etc. Of course, this embodiment is merely an example of a specific value for L1mm, and does not impose any limitations. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0032] With this configuration, L1 is limited to a certain range in this embodiment, providing sufficient installation space for the pole post assembly 4, avoiding interference between the pole post assembly 4 and the cover plate 1 and the welding wire, and ensuring that the connecting plate 2 has sufficient structural strength. If L1 is too small, the cantilever portion will not be able to accommodate the pole post assembly 4, and the pole post assembly 4 may extend beyond the edge of the connecting plate 2, thus interfering with the cover plate 1; if L1 is too large, the cantilever of the connecting plate 2 will be too long, and it will be prone to bending deformation under the pressure of the pole post assembly 4, causing the pole post assembly 4 to shift.

[0033] Furthermore, in an optional embodiment, the pole assembly 4 includes a pole body 41, the pole body 41 having an overlapping portion 42 in the outer circumferential direction, the overlapping portion 42 extending in the horizontal direction, such that the overlapping portion 42 is connected to the mounting area 21.

[0034] In this embodiment, the overlapping portion 42 can be a protruding ring, which is sleeved on the outer circumference of the pole body 41. Of course, the overlapping portion 42 and the pole body 41 can be integrally formed or separate. This embodiment is merely illustrative and is not intended to limit the scope. Those skilled in the art can make changes according to actual circumstances, as long as the same technical effect is achieved.

[0035] With this configuration, the overlapping portion 42 in this embodiment can expand the contact area between the electrode body 41 and the connecting plate 2, thereby dispersing the pressure on the electrode body 41 and preventing local indentation or deformation of the connecting plate 2. At the same time, the horizontally extending overlapping portion 42 can limit the radial displacement of the electrode body 41, ensuring the connection stability between the electrode assembly 4 and the internal battery cell.

[0036] Furthermore, in an optional embodiment, the overlap length of the joint 42 and the mounting area 21 in the horizontal direction is L2mm, and L2mm satisfies: 1.5mm~3.8mm.

[0037] For example, L2mm can be 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, etc. Of course, this embodiment is merely an example of a specific value for L2mm, and does not limit it. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0038] By limiting L2 within a certain range, this embodiment enhances the connection stability between the overlapping portion 42 and the mounting area 21, ensuring sufficient contact area between the pole body 41 and the mounting area 21 and preventing the overlapping portion 42 from slipping off the mounting area 21. Furthermore, it controls the extension length of the overlapping portion 42 to prevent interference between the overlapping portion 42 and the first welding line 3, ensuring welding quality. If L2 is too small, the overlapping area will be insufficient, and the pressure of the pole body 41 will remain concentrated in a small area, making it easy for the overlapping portion 42 to slip off the mounting area 21. If L2 is too large, the overlapping portion 42 will extend too far, easily causing interference between the welding line and the overlapping portion 42, affecting welding quality.

[0039] Furthermore, in an optional embodiment, the pole assembly 4 further includes a pressure ring 43, the outer circumferential side of which is disposed in and connected to the mounting area 21. Additionally, the inner side of the pressure ring 43 overlaps the upper surface of the overlapping portion 42.

[0040] With this configuration, the pressure ring 43 in this embodiment can press the overlapping portion 42 from above, preventing the electrode body 41 from being pushed upwards due to vibration, thereby limiting the vertical displacement of the electrode body 41 and ensuring a stable connection between the electrode body 41 and the battery cell. Simultaneously, the pressure ring 43 can distribute the vertical pressure of the electrode body 41 to other positions on the connecting plate 2, further reducing local stress on the connecting plate 2.

[0041] Furthermore, in an optional embodiment, the area where the overlapping portion 42 and the pressure ring 43 overlap in the horizontal direction is called the overlapping area, and the length of the overlapping portion 42 in the overlapping area is L3mm, and L3mm satisfies: 1.8mm~4.2mm.

[0042] For example, L3mm can be 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, etc. Of course, this embodiment is merely an example of a specific value for L3mm, and does not limit it. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0043] By setting L3 within a certain range, this embodiment ensures sufficient contact between the overlapping portion 42 and the pressure ring 43, thereby allowing the pressure ring 43 to stably press against the overlapping portion 42 and preventing vertical displacement of the electrode assembly 4. Simultaneously, it controls the extension length of the pressure ring 43, preventing a reduction in the size of the electrode body 41 and ensuring sufficient current-carrying area to meet high-current transmission requirements. If L3 is too small, the contact area between the pressure ring 43 and the overlapping portion 42 will be insufficient, resulting in insufficient clamping force. If L3 is too large, the pressure ring 43 will extend too far, encroaching on the space of the electrode body 41, causing a reduction in the diameter of the electrode body 41 and insufficient current-carrying area.

[0044] Furthermore, in an optional embodiment, the height of the pressure ring 43 in the overlapping area is L4mm in the vertical direction, and L4mm satisfies: 1.4mm~2.5mm.

[0045] For example, L4mm can be 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, etc. Of course, this embodiment is merely an example of a specific value for L4mm, and does not impose any limitations on it. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0046] By limiting L4 within a certain range, this embodiment can improve the structural strength of the retaining ring 43 itself and prevent deformation. Simultaneously, it avoids additionally increasing the overall height of the battery, thus ensuring the battery's energy density. If L4 is too small, the retaining ring 43 will be too thin, lacking sufficient vertical bending resistance, making it prone to deformation and failure. If L4 is too large, the retaining ring 43 will be too tall and bulky, increasing the overall height of the battery, encroaching on the top space, leading to a larger battery volume and reduced energy density.

[0047] Furthermore, in an alternative embodiment, the mounting area 21 is an L-shaped groove, and the outer edge of the pressure ring 43 abuts against the inner wall of the groove.

[0048] With this configuration, the outer edge of the pressure ring 43 abuts against the inner wall of the groove in this embodiment, which can further improve the stability of the pressure ring 43 after it is installed on the connecting plate 2, prevent misalignment of the pole body 41, and ensure stable circuit connection. At the same time, the groove can serve as a reference for the installation of the pressure ring 43, assisting in the positioning and installation of the pressure ring 43 and reducing circumferential errors during assembly. Furthermore, the inner wall of the groove can provide radial support for the pressure ring 43, dispersing the radial stress of the pressure ring 43.

[0049] Furthermore, in an optional embodiment, the outer edge of the pressure ring 43 extends horizontally to form an abutment portion 44, the outer edge of which abuts against the inner wall of the groove. The upper surface of the abutment portion 44 is flush with the upper surface of the connecting plate 2.

[0050] With this configuration, the upper surface of the abutment portion 44 is flush with the upper surface of the connecting plate 2, optimizing the top space of the battery. This ensures that neither the upper surface of the abutment portion 44 nor the upper surface of the connecting plate 2 occupies additional space on the top of the battery, facilitating the installation of other components in the battery pack. Furthermore, the flat mating surfaces allow the abutment portion 44 and the connecting plate 2 to be subjected to uniform force during actual operation, avoiding stress concentration caused by height differences.

[0051] Furthermore, in an optional embodiment, the outer edge of the pressure ring 43 extends horizontally to form an abutment portion 44, and the outer edge of the abutment portion 44 abuts against the inner wall of the groove. In the vertical direction, there is a height difference between the upper surface of the abutment portion 44 and the upper surface of the connecting plate 2. That is, the upper surface of the abutment portion 44 is not flush with the upper surface of the connecting plate 2.

[0052] With this configuration, a height difference exists between the upper surface of the abutment portion 44 and the upper surface of the connecting plate 2 in this embodiment. This allows for the avoidance of top components of the battery or enhances the strength of the abutment portion 44, meeting the customized needs of different batteries. If a thick component is installed on the top of the battery, the abutment portion 44 can be lower than the connecting plate 2, thus providing clearance for other components and preventing interference between the sensor and the abutment portion 44. If it is necessary to enhance the strength of the abutment portion 44, it can be made higher than the connecting plate 2, thereby increasing the thickness of the abutment portion 44 and improving the bending resistance of the pressure ring 43.

[0053] Furthermore, in an optional embodiment, the length of the abutment portion 44 in the horizontal direction is L5mm, and L5mm satisfies: 1mm~3.2mm.

[0054] For example, L5mm can be 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, etc. Of course, this embodiment is merely an example of a specific value for L5mm, and does not limit it. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0055] By setting the length of the abutment portion 44 within a certain range, this embodiment ensures that the abutment portion 44 makes full contact with the inner wall of the groove, thus dispersing the radial stress of the pressure ring 43. If L5 is too small, the contact area between the abutment portion 44 and the inner wall of the groove will be insufficient, resulting in weak radial support and making the pressure ring 43 prone to deformation. If L5 is too large, the abutment portion 44 will extend too far, compressing the installation space of the pole body 41.

[0056] Furthermore, in an optional embodiment, the outer edge of the abutment portion 44 is welded to the inner wall edge of the groove to form a second weld line 5, the penetration depth of the second weld line 5 being L6mm, wherein L6mm satisfies: 0.5mm~1.0mm.

[0057] For example, L6mm can be 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1.0mm, etc. Of course, this embodiment is merely an example of a specific value for L6mm, and does not impose any limitations. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0058] With this configuration, the abutment portion 44 is welded to the groove in this embodiment, and the penetration depth of the second weld line 5 is limited to a certain range. This ensures a firm connection between the pressure ring 43 and the inner wall of the groove, preventing the pressure ring 43 from detaching. Simultaneously, it avoids the problem of weld penetration caused by excessive penetration of the second weld line 5, ensuring the structural integrity of the connecting plate 2 and the pressure ring 43. It also ensures balanced overall welding strength, improving the overall structural strength. If L6 is too small, the strength of the second weld line 5 will be insufficient, and the pressure ring 43 will easily detach from the inner wall of the groove under radial force; if L6 is too large, it will easily weld through the abutment portion 44 or the inner wall of the groove, causing damage to the connecting plate 2 and affecting the integrity of the battery.

[0059] Furthermore, in an optional implementation, the ratio L6 / L1 satisfies: 0.04~0.12.

[0060] For example, the ratio L6 / L1 can be 0.04, 0.045, 0.5, 0.055, 0.06, 0.065, 0.07, 0.075, 0.08, 0.085, 0.09, 0.095, 0.1, 0.105, 0.11, 0.115, 0.12, etc. Of course, this embodiment is merely an example illustrating the specific value of the ratio L6 / L1, and it is not intended to limit the scope. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0061] By setting the ratio L6 / L1 within a certain range, this embodiment allows the first welding wire 3 and the second welding wire 5 to share the tensile and radial stresses of the connecting plate 2, avoiding stress concentration on a single welding wire that could lead to breakage of the overall structure. If L6 / L1 is too small, it means L6 is too weak or L1 is too long, in which case the second welding wire 5 cannot support the radial force transmitted by the connecting plate 2, and the connection plate 2 and the pressure ring 43 are prone to breakage. If L6 / L1 is too large, it means L6 is too strong or L1 is too short, in which case the second welding wire 5 is prone to being welded through, or the connecting plate 2 is too short to accommodate the pole post assembly 4.

[0062] Furthermore, in an optional embodiment, the groove depth is L7mm in the vertical direction, wherein L7mm satisfies: 0.6mm~1.0mm.

[0063] For example, L7mm can be 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1.0mm, etc. Of course, this embodiment is merely an example of a specific value for L7mm, but it is not intended to limit the value. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0064] By limiting the groove depth within a certain range, this embodiment ensures that the pressure ring 43 is fully embedded in the groove, preventing the abutment portion 44 from protruding and occupying top space. Furthermore, the groove is not too deep, ensuring sufficient thickness at the bottom of the connecting plate 2, thus guaranteeing its structural strength and maintaining its resistance to bending and breakage. Simultaneously, fully embedding the pressure ring 43 reduces the gap between the groove and the pressure ring 43, providing a certain degree of sealing. If L7 is too small, the abutment portion 44 will not be fully embedded in the groove, resulting in a protrusion on the upper surface of the connecting plate 2 that occupies top space. If L7 is too large, the groove will be too deep, leaving insufficient remaining thickness for the connecting plate 2, leading to an excessively thin bottom and increased susceptibility to breakage.

[0065] Furthermore, in an optional embodiment, the thickness of the overlapping portion 42 is L8mm in the vertical direction, and the height of the pole body 41 is L9mm, with the ratio L8 / L9 satisfying 0.08~0.28.

[0066] For example, the ratio L8 / L9 can be 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, etc. Of course, this embodiment is merely an example illustrating the specific values ​​of the ratio L8 / L9, and it is not intended to limit the scope. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0067] By setting it this way, this embodiment limits the ratio L8 / L9 within a certain range, ensuring that the overlapping portion 42 can withstand the clamping force of the pressure ring 43 and avoid deformation. At the same time, it ensures that the height of the electrode body 41 is sufficient to stably connect to the battery cell tab without affecting circuit transmission. It also prevents the overlapping portion 42 from being too thick, which would lead to uneven weight distribution of the electrode body 41, thereby enhancing the overall rigidity of the electrode body 41. If L8 / L9 is too small, the overlapping portion 42 will be too thin, resulting in insufficient support strength. If L8 / L9 is too large, the overlapping portion 42 will be too thick, resulting in a shorter effective height of the electrode body 41, affecting the connection with the battery cell.

[0068] Furthermore, in an optional embodiment, the thickness L8mm of the overlap portion 42 satisfies 0.4mm~0.8mm. For example, L8mm can be 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, etc. Of course, this embodiment is merely an example of a specific value for L8mm, but it is not intended to limit the value. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0069] By designing the overlap portion 42 within a certain range, this embodiment ensures that the overlap portion 42 can withstand the pressure of the pressure ring 43 without deformation. Simultaneously, it avoids material waste caused by excessive thickness of the overlap portion 42, thereby reducing the manufacturing cost of the terminal body 41 and the overall weight of the battery. Furthermore, it makes it easier to control the weld depth when welding the overlap portion 42 to the pressure ring 43. If L8 is too small, the overlap portion 42 will be too thin, making it prone to plastic deformation when clamped by the pressure ring 43. If L8 is too large, the overlap portion 42 will be too thick, increasing the weight and cost of the terminal body 41.

[0070] Furthermore, in an optional embodiment, the height L9mm of the pole body 41 satisfies 2.8mm~6mm.

[0071] For example, L9mm can be 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm, 6mm, etc. Of course, this embodiment is merely an example of a specific value for L9mm, and does not limit it. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0072] By configuring the electrode post 41 within this range, this embodiment ensures that the electrode post 41 can connect to the battery cell without excessively occupying internal battery space. It also prevents the electrode post 41 from becoming too large, which would compress the battery cell space and maintain battery energy density. If L9 is too small, the electrode post 41 will be too short to extend to the battery cell tab, causing a circuit break. If L9 is too large, the electrode post 41 will be too long, increasing the battery height and thus reducing battery energy density.

[0073] Furthermore, in an optional embodiment, a receiving gap exists between the inner side of the pressure ring 43 and the upper surface of the overlapping portion 42, and an insulating element may also be provided between the inner side of the pressure ring 43 and the upper surface of the overlapping portion 42. That is, the insulating element fills the receiving gap.

[0074] With this configuration, since there may be a small gap between the inner side of the pressure ring 43 and the overlapping portion 42, a short circuit or discharge may occur between them under high voltage conditions. Therefore, in this embodiment, filling the receiving gap with an insulating component can directly block the internal electrical connection between the pressure ring 43 and the overlapping portion 42, forming insulation protection. At the same time, after the insulating component is filled into the receiving gap, it can play a buffering role to a certain extent, thereby reducing the relative vibration between the pressure ring 43 and the overlapping portion 42.

[0075] Secondly, this utility model also provides a battery device, which includes: The housing structure of any of the above embodiments has an internal receiving cavity; The battery cell is housed in the receiving cavity; the battery cell is connected to the terminal assembly 4 in the housing structure.

[0076] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A shell structure, characterized in that, include: The cover plate (1) has mounting holes (11); A connecting plate (2) is disposed in the mounting hole (11); one side of the connecting plate (2) is welded to the cover plate (1) to form a first weld line (3); the other side of the connecting plate (2) extends toward the center of the mounting hole (11); a mounting area (21) is provided on the connecting plate (2); The pole assembly (4) is disposed on the mounting area (21); The penetration depth of the first weld line (3) is H mm. In the horizontal direction, the distance between the center of the first weld line (3) and the other side of the connecting plate (2) is L1 mm. The ratio between the penetration depth of the first weld line (3) and the distance between the center of the first weld line (3) and the other side of the connecting plate (2) is H / L1, where H / L1 satisfies: 0.04~0.

11.

2. The shell structure according to claim 1, characterized in that, The Hmm is between 0.5mm and 1.0mm.

3. The shell structure according to claim 1, characterized in that, The L1mm is 8mm~15mm.

4. The shell structure according to any one of claims 1 to 3, characterized in that, The pole assembly (4) includes: The pole body (41) has an overlapping part (42) on its outer circumference. The overlapping part (42) extends in the horizontal direction so that the overlapping part (42) is connected to the mounting area (21).

5. The shell structure according to claim 4, characterized in that, Along the horizontal direction, the length of the overlap between the overlapping part (42) and the installation area (21) is L2mm, and L2mm satisfies: 1.5mm~3.8mm.

6. The shell structure according to claim 5, characterized in that, The pole assembly (4) also includes: A pressure ring (43) is arranged circumferentially on the outer side in the mounting area (21) and connected to the mounting area (21); the inner side of the pressure ring (43) overlaps the upper surface of the overlapping part (42).

7. The shell structure according to claim 6, characterized in that, Along the horizontal direction, the area where the overlapping part (42) and the pressure ring (43) overlap is called the overlapping area. The length of the overlapping part (42) in the overlapping area is L3mm, and L3mm satisfies: 1.8mm~4.2mm.

8. The shell structure according to claim 7, characterized in that, In the vertical direction, the height of the pressure ring (43) in the overlapping area is L4mm, and L4mm satisfies: 1.4mm~2.5mm.

9. The shell structure according to claim 8, characterized in that, The mounting area (21) is an L-shaped groove, and the outer edge of the pressure ring (43) abuts against the inner wall of the groove.

10. The shell structure according to claim 9, characterized in that, The outer edge of the pressure ring (43) extends horizontally to form an abutment portion (44), the outer edge of the abutment portion (44) abuts against the inner wall of the groove; and the upper surface of the abutment portion (44) is flush with the upper surface of the connecting plate (2).

11. The shell structure according to claim 9, characterized in that, The outer edge of the pressure ring (43) extends horizontally to form an abutment portion (44), the outer edge of the abutment portion (44) abuts against the inner wall of the groove; and in the vertical direction, there is a height difference between the upper surface of the abutment portion (44) and the upper surface of the connecting plate (2).

12. The shell structure according to claim 10 or 11, characterized in that, Along the horizontal direction, the length of the abutment part (44) is L5mm, and L5mm satisfies: 1mm~3.2mm.

13. The shell structure according to claim 12, characterized in that, The outer edge of the abutting part (44) is welded to the inner wall edge of the groove to form a second weld line (5), and the penetration depth of the second weld line (5) is L6mm, wherein L6mm satisfies: 0.5mm~1.0mm.

14. The shell structure according to claim 13, characterized in that, The ratio L6 / L1 satisfies the condition: 0.04~0.

12.

15. The shell structure according to claim 10, characterized in that, In the vertical direction, the groove depth is L7mm, where L7mm satisfies: 0.6mm~1.0mm.

16. The shell structure according to any one of claims 13 to 15, characterized in that, In the vertical direction, the thickness of the overlapping part (42) is L8mm, the height of the pole body (41) is L9mm, and the ratio L8 / L9 satisfies 0.08~0.

28.

17. The shell structure according to any one of claims 13 to 15, characterized in that, The thickness L8mm of the overlapping part (42) satisfies 0.4mm~0.8mm.

18. The shell structure according to any one of claims 5 to 10, characterized in that, The height L9mm of the pole body (41) satisfies 2.8mm~6mm.

19. The shell structure according to any one of claims 6 to 10, characterized in that, An insulating element is provided between the inner side of the pressure ring (43) and the upper surface of the overlapping part (42).

20. A battery device, characterized in that, include: The shell structure as described in any one of claims 1 to 19 has an internal receiving cavity; The battery cell is disposed in the receiving cavity; The battery cell is connected to the terminal assembly (4) in the housing structure.

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