Case structure and battery device

Abstract

The utility model relates to a battery technical field, concretely relates to a casing structure and battery device, the casing structure includes: the shell is seted up with mounting hole, the inside of shell is suitable for placing the electric core subassembly, the connecting plate is provided with top surface, and the top surface includes first connecting surface and second connecting surface, and the second connecting surface extends to the direction away from the electric core subassembly, the first through -hole is seted up on the second connecting surface, and the outer edge of first connecting surface and the inner wall of mounting hole are welded and form first weld line, the compression ring, the outer edge of compression ring and second connecting surface are welded and form second weld line, and the compression ring sets up the second through -hole and forms the inner edge, the pole is in turn and is connected with the inner edge in the second through -hole and the first through -hole, along the vertical direction, and there is height difference between first connecting surface and second connecting surface. The embodiment sets up the height difference between first connecting surface and second connecting surface, makes stress disperses along multiple directions, does not concentrate in the same plane narrow area any longer, and then avoids the problem of stress concentration.

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. Generally, the tabs are connected to the poles first, and then the poles are connected to the cover plate using laser welding. However, during the actual welding process, because the edge gaps between the poles and the cover plate need to be welded, if the edge 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, in actual use, the connection between the cover plate and the connecting plate needs to be welded, and the connection between the electrode lug and the connecting plate also needs to be welded. Moreover, the two welding positions are close to each other, which can easily lead to stress concentration. Utility Model Content

[0005] In view of this, the present invention provides a housing structure and battery device to solve the problem that stress concentration is likely to occur when the welding positions of the cover plate and the connecting surface and the electrode tab and the connecting surface are too close.

[0006] In a first aspect, this utility model provides a shell structure, which includes: The housing has mounting holes; the interior of the housing is suitable for placing the battery cell assembly. A connecting plate is disposed in a mounting hole; the connecting plate has a top surface, the top surface including a first connecting surface and a second connecting surface, the second connecting surface extending away from the battery cell assembly; a first through hole is provided on the second connecting surface, and the outer edge of the first connecting surface is welded to the inner wall of the mounting hole to form a first weld line; there is a height difference between the first connecting surface and the second connecting surface in the vertical direction; The pressure ring has its outer edge welded to the second connecting surface to form a second weld line, and the pressure ring has a second through hole to form its inner edge; The pole extends sequentially into the second through hole and the first through hole and connects to the inner edge.

[0007] Beneficial Effects: In traditional designs, the connecting plate is typically planar, causing the first and second welding wires to be on the same plane with a small horizontal gap. When the battery vibrates or the cell expands, the stress on the connecting plate concentrates between the two welding wires, leading to deformation of the connecting plate or cracking of the welding wires. This embodiment sets a height difference between the first and second connecting surfaces, causing the first and second welding wires to be staggered vertically. Combined with the original horizontal gap, this significantly increases the distance between the first and second welding wires, dispersing stress in multiple directions and preventing it from concentrating in a narrow area on the same plane, thus avoiding stress concentration problems.

[0008] Secondly, this utility model also provides a battery device, which includes: The housing structure as described in any of the above embodiments has an internal receiving cavity; The battery cell assembly is housed in the receiving cavity; the battery cell assembly is connected to the terminal post in 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 A cross-sectional view of the battery along its length in this embodiment of the present invention; Figure 3 for Figure 2 An enlarged diagram in Part A; Figure 4 for Figure 3 A parameter annotation diagram of some components; Figure 5 for Figure 3 The parameter annotation diagram for another part of the components.

[0011] Explanation of reference numerals in the attached figures: 1. Outer casing; 2. Battery cell assembly; 3. Connecting plate; 31. Top surface; 311. First connecting surface; 312. Second connecting surface; 313. Transition surface; 3131. First arc surface; 3132. Second arc surface; 3133. Step surface; 4. First welding line; 5. Pressure ring; 6. Second welding line; 7. Terminal post. 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 a terminal post 7 and a cover plate. Generally, the tab is first connected to the terminal post 7, and then the terminal post 7 is connected to the cover plate via laser welding. However, during the actual welding process, because the edge gaps between the terminal post 7 and the cover plate need to be welded, if the edge 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, leading to insulation failure or battery cell failure. Therefore, some batteries have an additional connecting plate 3 between the cover plate and the terminal post 7, creating overlap between the connecting plate 3 and both the cover plate and the terminal post 7. This prevents the laser from directly passing through the gaps during laser welding. However, in actual use, because the connection between the cover plate and the connecting plate 3 needs to be welded, and the connection between the tab and the connecting plate 3 also needs to be welded, and the two welding points are relatively close, there is a risk of stress concentration.

[0017] In view of this, the present invention provides a housing structure and battery device to solve the problem that stress concentration is likely to occur when the welding positions of the cover plate and the connecting surface and the electrode tab and the connecting surface are too close.

[0018] The following is combined with Figures 1 to 5 The following describes embodiments of the present invention.

[0019] According to an embodiment of the present invention, a housing structure is provided, which includes an outer shell 1, a connecting plate 3, a pressure ring 5, and an pole post 7.

[0020] Specifically, in this embodiment, the outer casing 1 has mounting holes, and the interior of the outer casing 1 is suitable for placing the battery cell assembly 2. The mounting holes can be located at the bottom, top, or side wall of the outer casing 1. Of course, this embodiment is merely an example of the mounting hole's location and is not intended to limit the possibility of placement. Those skilled in the art can modify the location according to actual circumstances, as long as the same technical effect is achieved.

[0021] Furthermore, in this embodiment, the connecting plate 3 is disposed in the mounting hole. The connecting plate 3 and the inner wall of the mounting hole can be connected by welding. Of course, they can also be connected by riveting or bonding; this embodiment is merely an example. The following implementation method uses welding of the connecting plate 3 to the inner wall of the mounting hole as an example.

[0022] In this embodiment, the connecting plate 3 has a top surface 31, which includes a first connecting surface 311 and a second connecting surface 312. The second connecting surface 312 extends away from the battery cell assembly 2. Since the battery cell assembly 2 is placed inside the connecting plate 3, the first connecting surface 311 and the second connecting surface 312 are not on the same horizontal level of the connecting plate 3. The second connecting surface 312 protrudes outward, meaning that the connecting plate 3 has at least one convex surface, and the second connecting surface 312 is located on the convex surface. In other words, there is a height difference between the first connecting surface 311 and the second connecting surface 312 in the vertical direction.

[0023] Furthermore, a first through hole is provided on the second connecting surface 312, and the outer edge of the first connecting surface 311 is welded to the inner wall of the mounting hole to form a first weld line 4.

[0024] Furthermore, in this embodiment, the outer edge of the pressure ring 5 is welded to the second connecting surface 312 to form a second weld line 6. The pressure ring 5 has a second through hole, forming an inner edge. The pole post 7 extends into the second through hole and the first through hole in sequence and connects to the inner edge. For the specific connection method, for example, the inner edge of the pressure ring 5 can be riveted to the pole post 7. Then, the entire assembly of the pressure ring 5 and the pole post 7 after riveting is placed on the connecting plate 3, and then the bottom of the outer edge of the pressure ring 5 is welded to the connecting plate 3. Of course, the connection method between the pressure ring 5 and the pole post 7 can also be welding or bonding. This embodiment is merely illustrative and does not limit the scope. Those skilled in the art can modify it according to actual conditions, as long as the same technical effect is achieved.

[0025] In traditional designs, the connecting plate 3 is typically planar, causing the first welding line 4 and the second welding line 6 to be on the same plane with a small horizontal gap. When the battery vibrates or the cell expands, the stress on the connecting plate 3 concentrates between the two welding lines, leading to deformation of the connecting plate 3 or cracking of the welding lines. This embodiment establishes a height difference between the first connecting surface 311 and the second connecting surface 312, causing the first welding line 4 and the second welding line 6 to be vertically staggered. Combined with the original horizontal gap, this significantly increases the distance between the first welding line 4 and the second welding line 6, dispersing stress in multiple directions and preventing it from concentrating in a narrow area on the same plane, thus avoiding stress concentration problems.

[0026] Furthermore, in an alternative embodiment, the height difference is L1mm, where L1mm is between 1.5mm and 8mm.

[0027] For example, L1mm 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, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, etc. Of course, this embodiment is merely an example of a specific value for L1mm, and 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.

[0028] By setting it up in this way, the height difference in this embodiment is limited to a certain range, which ensures that there is enough space in the vertical direction to disperse stress, so that it is no longer concentrated in a narrow area on the same plane, thus avoiding the problem of stress concentration. If L1mm is too small, the vertical spacing will be insufficient, causing stress to still be concentrated between the double bonding wires, and stress concentration will still exist; if L1mm is too large, the second connecting surface 312 will be too high, which will increase the top space of the battery, increase the battery volume, and reduce the energy density of the battery.

[0029] Furthermore, in an optional embodiment, the penetration depth of the first bonding wire 4 is L2mm, where L2mm is between 0.2mm and 1mm.

[0030] For example, L2mm can be 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, etc. Of course, this embodiment is merely an example of a specific value for L2mm, 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.

[0031] By setting it in this way, the penetration depth of the first weld line 4 is limited within a certain range in this embodiment, which can ensure the strength of the first weld line 4 and ensure a firm connection between the connecting plate 3 and the outer shell 1. At the same time, it can also protect the integrity of the overall structure of the outer shell 1 and the connecting plate 3, avoiding the problem of weld penetration caused by excessive penetration depth, thereby ensuring the structural performance of the outer shell 1 and the connecting plate 3. If L2mm is too small, the bonding force of the first weld line 4 will be insufficient. When the connecting plate 3 is subjected to tension, the first weld line 4 will easily peel off from the outer shell 1, causing the connecting plate 3 to fall off and the battery seal to fail. If L2mm is too large, it means that the laser welding energy is too high, which can easily penetrate the outer shell 1 or the connecting plate 3, and easily cause structural damage to the outer shell 1 or the connecting plate 3.

[0032] Furthermore, in an optional embodiment, the weld width of the first weld line 4 is L3mm, where L3mm is between 0.15mm and 0.5mm.

[0033] For example, L3mm can be 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, etc. Of course, this embodiment is merely an example of a specific value for L3mm, but it is not intended to limit the value. Those skilled in the art can modify it according to the actual situation, as long as the same technical effect is achieved.

[0034] By configuring it in this way, the weld width of the first weld wire 4 is limited to a certain range, providing sufficient stress-bearing area to disperse the tensile force on the first weld wire 4, thereby preventing stress concentration that could lead to breakage. Simultaneously, it avoids the first weld wire 4 and the second weld wire 6 being too close, thus requiring a certain amount of stress dispersion space. If L3mm is too small, the stress-bearing area of ​​the first weld wire 4 will be small, easily leading to stress concentration and potentially causing breakage. If L3mm is too large, the first weld wire 4 will exceed the predetermined range, compressing the stress dispersion area and affecting stress dispersion.

[0035] Furthermore, in an optional embodiment, the penetration depth of the second bonding wire 6 is L4mm, where L4mm is between 0.3mm and 1mm.

[0036] For example, L4mm can be 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, etc. Of course, this embodiment is merely an example of a specific value for L4mm, 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.

[0037] Similarly, this embodiment limits the penetration depth of the second weld wire 6 within a certain range, ensuring its strength, firmly connecting the connecting plate 3 and the pressure ring 5, fixing the position of the pole post 7, and preventing its displacement. Simultaneously, it protects the integrity of the overall structure of the connecting plate 3 and the pressure ring 5, preventing burn-through due to excessive penetration, thus ensuring the structural performance of the connecting plate 3 and the pressure ring 5. If L4mm is too small, the bonding force of the second weld wire 6 will be insufficient, and when the pole post 7 is subjected to external force, the second weld wire 6 will easily peel off from the connecting plate 3, causing the pressure ring 5 to detach. If L4mm is too large, it indicates that the laser welding energy is too high, easily burning through the pressure ring 5 or the connecting plate 3, causing a short circuit between the pole post 7 and the connecting plate 3, and the pressure ring 5 will fail to provide insulation.

[0038] Furthermore, in an optional embodiment, the weld width of the second weld line 6 is L5mm, where L5mm is between 0.2mm and 0.6mm.

[0039] For example, L5mm can be 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, etc. Of course, this embodiment is merely an example of a specific value for L5mm, 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.

[0040] Similarly, this configuration limits the weld width of the second weld wire 6 within a certain range, providing sufficient stress-bearing area to disperse the tensile force and prevent stress concentration that could lead to breakage. It also avoids the first weld wire 4 and the second weld wire 6 being too close, thus requiring sufficient stress dispersion space. If L5mm is too small, the stress-bearing area of ​​the second weld wire 6 will be small, making it prone to stress concentration and potentially causing breakage. If L5mm is too large, the second weld wire 6 will exceed the predetermined range, compressing the stress dispersion area and affecting stress dispersion.

[0041] Furthermore, in an optional embodiment, the distance between the first weld line 4 and the second weld line 6 along the penetration direction is L6mm, where L6mm is between 2mm and 6mm.

[0042] For example, L6mm can be 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, etc. Of course, this embodiment is merely an example of a specific value for L6mm, 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.

[0043] By limiting L6mm to a certain range, this embodiment ensures that the two bonding wires are completely staggered in the vertical direction, preventing stress concentration when stress is transmitted along the height direction. Simultaneously, the certain vertical spacing allows the two bonding wires to bear forces in different directions. For example, the first bonding wire 4 bears the tensile force from the direction of the outer casing 1 and the pressure ring 5, while the second bonding wire 6 bears the tensile force from the direction of the electrode post 7 and the connecting plate 3, thus achieving stress dispersion. If L6mm is too small, even with a height difference, the vertical spacing is insufficient, and stress will still concentrate in the area between the two bonding wires; if L6mm is too large, the second connecting surface 312 will be too high, resulting in a larger battery volume and reducing the overall space utilization of the battery device.

[0044] Furthermore, in an optional embodiment, the distance between the first weld line 4 and the second weld line 6 along the weld width direction is L7mm, where L7mm is between 5mm and 15mm.

[0045] For example, L7mm can be 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.1mm, 9.2mm, 9.3mm, 9.4mm, 9.5mm, 9.6mm, 9.7mm, 9.8mm, 9.9mm, 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 L7mm, and it is not intended to limit the measurement. Those skilled in the art can modify it according to actual circumstances, as long as the same technical effect is achieved.

[0046] By limiting L7mm within a certain range, this embodiment ensures sufficient spacing between the double weld lines in both the horizontal and vertical directions, thereby guaranteeing adequate stress dispersion. Simultaneously, it ensures that the middle area of ​​the connecting plate 3, i.e., the stress dispersion area between the double weld lines, has sufficient width, thus preventing breakage due to stress concentration caused by an excessively narrow area. If L7mm is too small, the spacing between the double weld lines will be insufficient, failing to disperse stress effectively, thus still posing a risk of stress concentration. If L7mm is too large, the connecting plate 3 will be too large, weakening its structural strength and making it prone to deformation.

[0047] Furthermore, in an optional embodiment, the top surface 31 further includes a transition surface 313, which is disposed between the first connecting surface 311 and the second connecting surface 312. Since the first connecting surface 311 and the second connecting surface 312 are not at the same height, the transition surface 313 is required to smoothly connect the first connecting surface 311 and the second connecting surface 312, preventing right-angle or obtuse-angle structures from appearing at the joint of the first connecting surface 311 and the second connecting surface 312, thereby avoiding stress concentration caused by right-angle or obtuse-angle structures.

[0048] Specifically, the transition surface 313 is provided with a first arc surface 3131 and a second arc surface 3132. The first arc surface 3131 is bent in a direction away from the pole post 7, and the other side of the first arc surface 3131 is connected to the first connecting surface 311. The second arc surface 3132 is bent in a direction toward the pole post 7, and the other side of the second arc surface 3132 is connected to the second connecting surface 312. That is to say, the first arc surface 3131 has a concave structure, and the second arc surface 3132 has a convex structure.

[0049] With this configuration, since the transition surface 313 in the vertical direction is usually a right angle, stress concentration is prone to occur at the right angle, making the connecting plate 3 susceptible to cracking at the right angle under stress. This embodiment, by providing a first arc surface 3131 and a second arc surface 3132, can effectively disperse the transition stress between the first connecting surface 311 and the second connecting surface 312. Compared to a right-angle structure, the arc surface structure has greater resistance to bending, thus further avoiding stress concentration and improving the overall load-bearing capacity of the connecting plate 3.

[0050] Furthermore, in an alternative embodiment, the bending radius R1mm of the first arc surface 3131 is between 1mm and 2mm.

[0051] For example, R1mm can be 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, etc. Of course, this embodiment is merely an example of a specific value for R1mm, 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.

[0052] Furthermore, in an alternative embodiment, the bending radius R2mm of the second arc surface 3132 is between 1mm and 3mm.

[0053] For example, R2mm 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, etc. Of course, this embodiment is merely an example of a specific value for R2mm, 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.

[0054] By setting it in this way, the bending radii of the first arc surface 3131 and the second arc surface 3132 are limited to a certain range. This allows the first arc surface 3131 and the second arc surface 3132 to effectively disperse the transition stress of the first connecting surface 311 and the second connecting surface 312. At the same time, it can control the space occupied in the horizontal direction, thereby avoiding the increase in width caused by an excessively large bending radius. This allows for installation with the pressure ring 5 and the outer shell 1. If the bending radius is too small, the arc surface will be close to a right angle, and there will still be a significant problem of stress concentration. If the bending radius is too large, the electrode post 7 will be too far away from the connecting plate 3, thereby encroaching on the space occupied by the shell in the direction, increasing the overall volume of the shell structure, and reducing the energy density of the battery device.

[0055] Furthermore, in an optional embodiment, the length of the first connecting surface 311 in the horizontal direction is L8mm, where L8mm is between 2mm and 6mm.

[0056] For example, L8mm can be 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, 4.5mm, 5mm, 5.5mm, 6mm, etc. Of course, this embodiment is merely an example of a specific value for L8mm, 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.

[0057] By configuring the first connecting surface 311 within a certain range, this embodiment ensures that its length matches the welding strength of the first welding line 4, guaranteeing stable welding quality. It also keeps the dimensions of the housing structure within a reasonable range, preventing the housing structure from becoming too large due to an excessively long first connecting surface 311, which would reduce the energy density of the battery device. If L8mm is too small, the distance between the two welding lines may be too close, causing stress concentration. If L8mm is too large, the horizontal dimension of the connecting plate 3 will increase, weakening the structural strength of the connecting plate 3 itself and making it unable to match the welding strength of the first welding line 4, potentially leading to deformation of the connecting plate 3 or tearing of the first welding line 4.

[0058] Furthermore, in an optional embodiment, a stepped surface 3133 is provided on the second connecting surface 312 along the horizontal direction, and the stepped surface 3133 is welded to the pressure ring 5 to form the second weld line 6. The length of the stepped surface 3133 is L9mm, and L9mm is between 2mm and 6mm.

[0059] For example, L9mm can be 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, 4.5mm, 5mm, 5.5mm, 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.

[0060] Similarly, this embodiment controls the length of the second connecting surface 312 within a certain range, ensuring that the length of the second connecting surface 312 matches the welding strength of the second welding line 6, thus ensuring stable welding quality. It also keeps the dimensions of the housing structure within a reasonable range, preventing the housing structure from becoming too large due to the excessive length of the second connecting surface 312, which would reduce the energy density of the battery device. If L9mm is too small, the distance between the two welding lines may be too close, causing stress concentration. If L9mm is too large, the size of the connecting plate 3 will increase, resulting in weaker structural strength of the connecting plate 3 itself, and it will not be able to match the welding strength of the second welding line 6. Under stress on the electrode post 7, the connecting plate 3 may deform or the second welding line 6 may tear.

[0061] Furthermore, in an optional embodiment, the thickness of the connecting plate 3 is L10mm in the vertical direction, where L10mm is between 0.8mm and 4mm.

[0062] For example, L10mm can be 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, etc. Of course, this embodiment is merely an example of a specific value for L10mm, 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.

[0063] By limiting the thickness of the connecting plate 3 within a certain range, this embodiment enhances its rigidity, enabling it to stably withstand more stress and preventing bending deformation under external forces. If L10mm is too small, the connecting plate 3 will lack overall rigidity, making it prone to bending under the tension of the double welding wires and the pressure of the pressure ring 5, potentially leading to wire cracking and displacement of the terminal post 7. If L10mm is too large, the connecting plate 3 will be too thick, compressing the space occupied by the battery cell and reducing the overall energy density of the battery.

[0064] Secondly, this utility model also provides a battery device, which includes: The housing structure as described in any of the above embodiments has an internal receiving cavity; The battery cell assembly 2 is disposed in the receiving cavity; the battery cell assembly 2 is connected to the terminal post 7 in the housing structure.

[0065] 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 outer casing (1) has mounting holes; the interior of the outer casing (1) is suitable for placing the battery cell assembly (2); A connecting plate (3) is disposed in the mounting hole; the connecting plate (3) has a top surface (31), the top surface (31) includes a first connecting surface (311) and a second connecting surface (312), the second connecting surface (312) extends away from the battery cell assembly (2); a first through hole is provided on the second connecting surface (312), and the outer edge of the first connecting surface (311) is welded to the inner wall of the mounting hole to form a first welding line (4); there is a height difference between the first connecting surface (311) and the second connecting surface (312) in the vertical direction; A pressure ring (5) is provided, the outer edge of which is welded to the second connecting surface (312) to form a second weld line (6), and the pressure ring (5) is provided with a second through hole to form an inner edge; The pole post (7) extends into the second through hole and the first through hole in sequence and is connected to the inner edge.

2. The shell structure according to claim 1, characterized in that, The height difference is L1mm, and L1mm is between 1.5mm and 8mm.

3. The shell structure according to claim 2, characterized in that, The penetration depth of the first weld line (4) is L2mm, which is between 0.2mm and 1mm.

4. The shell structure according to claim 3, characterized in that, The weld width of the first weld line (4) is L3mm, which is between 0.15mm and 0.5mm.

5. The shell structure according to claim 1, characterized in that, The penetration depth of the second weld line (6) is L4mm, which is between 0.3mm and 1mm.

6. The shell structure according to claim 5, characterized in that, The weld width of the second weld line (6) is L5mm, which is between 0.2mm and 0.6mm.

7. The shell structure according to any one of claims 1 to 6, characterized in that, Along the direction of penetration, the distance between the first weld line (4) and the second weld line (6) is L6mm, where L6mm is between 2mm and 6mm.

8. The shell structure according to any one of claims 1 to 6, characterized in that, Along the weld width direction, the distance between the first weld line (4) and the second weld line (6) is L7mm, where L7mm is between 5mm and 15mm.

9. The shell structure according to any one of claims 1 to 6, characterized in that, The top surface (31) also includes: A transition surface (313) is disposed between the first connecting surface (311) and the second connecting surface (312); The transition surface (313) is provided with a first arc surface (3131) and a second arc surface (3132); the first arc surface (3131) is bent in a direction away from the pole post (7), and the other side of the first arc surface (3131) is connected to the first connecting surface (311); the second arc surface (3132) is bent in a direction toward the pole post (7); the other side of the second arc surface (3132) is connected to the second connecting surface (312).

10. The shell structure according to claim 9, characterized in that, The bending radius of the first arc surface (3131) is R1mm, which is between 1mm and 2mm.

11. The shell structure according to claim 10, characterized in that, The bending radius of the second arc surface (3132) is R2mm, which is between 1mm and 3mm.

12. The shell structure according to any one of claims 1 to 6, characterized in that, Along the horizontal direction, the length of the first connecting surface (311) is L8mm, which is between 2mm and 6mm.

13. The shell structure according to any one of claims 1 to 6, characterized in that, Along the horizontal direction, a stepped surface (3133) is provided on the second connecting surface (312), and the stepped surface (3133) is welded to the pressure ring (5) to form the second weld line (6); the length of the stepped surface (3133) is L9mm, and L9mm is between 2mm and 6mm.

14. The shell structure according to any one of claims 1 to 6, characterized in that, The thickness of the connecting plate (3) in the vertical direction is L10mm, which is between 0.8mm and 4mm.

15. A battery device, characterized in that, include: The shell structure as described in any one of claims 1 to 14 has an internal receiving cavity; A cell assembly (2) is disposed in the receiving cavity; the cell assembly (2) is connected to the terminal post (7) in the housing structure.

Images