Battery case and battery

Abstract

The application belongs to the technical field of batteries, and discloses a battery shell and a battery, wherein the battery shell comprises a closing plate, a shell body and a cover plate body, and a working through hole with a stepped structure is formed on the shell body and / or the cover plate body; when the closing plate composed of a closing part and a plug-in part closes the working through hole, the closing plate has a large contact area, the sealing performance of the working through hole is improved, and the thickness of the limiting step under different welding forms is limited, so that 0.3mm≤T1≤0.8H is met when seam welding is performed, and 0.5mm≤T2≤0.8H is met when penetration welding is performed; in this way, on the one hand, the thickness of the limiting step is prevented from being too large, the welding depth reserved for welding is prevented from being too small, and the welding strength is prevented from being affected; on the other hand, the thickness of the limiting step is prevented from being too small, and deformation is prevented from easily occurring, so that the closing part cannot provide effective structural support.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a battery casing and a battery. Background Technology

[0002] Traditional battery structures typically involve first assembling the electrode assembly into the battery casing. Then, the positive and negative tabs of the electrode assembly are bent multiple times to form an approximate S-shape. Next, a cover assembly with terminals is inserted into the opening of the battery casing, and the corresponding polarity tabs are welded to the terminals. After the tabs and terminals are welded, the battery casing is then welded to the aluminum plate in the cover assembly to seal the battery casing, thus completing the battery assembly. However, this structure requires welding the tabs and terminals before welding the aluminum plate to the casing, which can lead to high temperatures and vibrations during the welding process, affecting the welding quality between the tabs and terminals.

[0003] Therefore, in order to improve the welding quality between the battery tabs and terminals in the traditional structure, the structure is modified by creating a working window for welding the tabs in advance on the aluminum plate. This allows the welding of the tabs to be performed after the aluminum plate is welded to the outer casing, thereby improving the welding quality. After the welding of the tabs is completed, the working window is then closed with a metal plate. However, because the aluminum plate is relatively thin, problems such as poor welding or poor welding strength are prone to occur when the metal plate is welded to the aluminum plate. Summary of the Invention

[0004] The purpose of this invention is to provide a battery casing and battery that improve the welding quality of the enclosed work window and enhance the welding strength.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A battery casing is provided, the battery casing including a sealing plate, a casing body with an opening, and a cover plate body for closing the opening of the casing body. The casing body has a wall opposite to the opening, and / or the cover plate body has a working through hole for welding tabs. The working through hole has a stepped structure including a first hole segment and a second hole segment, and a limiting step is formed between the first hole segment and the second hole segment. The sealing plate includes a sealing part and an insertion part. The insertion part is inserted into the second hole segment, and the sealing part is inserted into the first hole segment and abuts against the limiting step. The sealing part is welded to the casing body, and / or the cover plate body, for closing the working through hole.

[0007] When the closure part and the outer shell body, and / or the cover plate body are butt-welded, the thickness of the limiting step along the first direction is T1, and satisfies 0.3mm≤T1≤0.8H;

[0008] When the closure part and the outer shell body, and / or the cover plate body are through welded, the thickness of the limiting step along the first direction is T2, and satisfies 0.5mm≤T2≤0.8H, where H is the thickness of the wall surface of the outer shell body opposite to the opening or the cover plate body along the first direction.

[0009] Optionally, when the closure part and the outer shell body, and / or the cover plate body are butt-welded, the width dimension of the limiting step along the second direction is L1, and satisfies 0.5mm≤L1≤20mm.

[0010] Optionally, when the closure part and the outer shell body, and / or the cover plate body are through welded, the width dimension of the limiting step along the second direction is L2, and satisfies 1mm≤L2≤20mm.

[0011] Optionally, the outer casing body and the wall opposite the opening, and / or the cover plate body are provided with a mounting boss, the mounting boss protruding in the first direction away from the electrode tab, and the working through hole of the stepped structure is opened on the mounting boss.

[0012] Optionally, the battery casing further includes a terminal post, one end of which is electrically connected to the tab, and the other end of which extends out of the casing body onto the wall opposite to the opening or the cover body away from the tab. The height of the terminal post extending along the first direction is K, and the height of the mounting boss protruding along the first direction is Y, satisfying that 0.1mm≤Y≤K.

[0013] Optionally, the outer casing body and the wall opposite the opening or the side of the cover plate body where the mounting boss is provided are further provided with an insulating member. The distance between the side of the mounting boss facing the insulating member and the insulating member along the second direction is W, and satisfies that W≥1mm.

[0014] Optionally, the distance between the outer edge of the outer wall of the outer shell body and the wall opposite the opening and the mounting boss along the third direction is D1, and satisfies 4mm≤D1≤30mm.

[0015] Optionally, the distance between the outer edge of the cover plate body and the mounting boss along a third direction is D2, and satisfies 2mm≤D2≤30mm.

[0016] Optionally, a first bevel is formed on the inner wall of the first hole segment, and a second bevel corresponding to the first bevel is formed on the sealing plate. The first bevel and the second bevel together form a welding space for butt welding.

[0017] On the other hand, a battery is also provided, the battery including an electrode assembly and a battery housing as described in any of the preceding claims, the electrode assembly being disposed within the battery housing.

[0018] The beneficial effects of this invention are:

[0019] This invention provides a battery casing. The casing includes a sealing plate consisting of a plug-in portion and a sealing portion. A stepped working through-hole is formed on the wall surface opposite the opening of the casing body and / or on the cover plate body. When the sealing plate closes the working through-hole, the plug-in portion is inserted into a second hole segment, and the sealing portion is inserted into a first hole segment, abutting against a limiting step. This increases the contact area and improves the sealing performance of the working through-hole. Furthermore, by limiting the thickness of the limiting step for different welding methods, it satisfies 0.3mm≤T1≤0.8H for butt welding and 0.5mm≤T2≤0.8H for through welding. This avoids both excessively thick limiting steps, which would result in insufficient welding depth and affect welding strength, and excessively thin limiting steps, which would lead to deformation and inability to provide effective structural support for the sealing portion.

[0020] The present invention also provides a battery that, by applying the above-mentioned battery casing, ensures the welding strength and welding quality of the working window for welding the tabs, avoids exposure of the tabs due to insufficient welding strength, improves the protective performance of the tabs, and improves product quality. Attached Figure Description

[0021] Figure 1 This is a partial cross-sectional view of the battery casing sealing plate provided by the present invention after the butt joint welding is completed;

[0022] Figure 2 This is a partial cross-sectional view of the battery casing sealing plate provided by the present invention after penetration welding is completed;

[0023] Figure 3 This is a partial cross-sectional view of the battery casing after the casing body and the sealing plate are assembled, provided by the present invention.

[0024] Figure 4 This is a partial longitudinal cross-sectional view of the battery casing provided by the present invention after the casing body and the sealing plate are assembled.

[0025] Figure 5This is a partial cross-sectional view of the battery casing after the cover plate body and the sealing plate are assembled, as provided by the present invention.

[0026] Figure 6 This is a partial longitudinal cross-sectional view of the battery casing after the cover plate body and the sealing plate are assembled, as provided by the present invention.

[0027] In the picture:

[0028] 100. Limiting step; 200. Mounting boss;

[0029] 1. Enclosure plate; 11. Enclosure section; 12. Connecting section;

[0030] 2. Outer shell;

[0031] 3. Cover plate body;

[0032] 4. Pole post;

[0033] 5. Insulating components. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0035] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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 refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0038] To improve welding quality and strength when the work window is closed, the present invention provides a battery casing.

[0039] like Figures 1 to 6 As shown, the battery casing includes a sealing plate 1, a casing body 2 with an opening, and a cover plate body 3 for closing the opening of the casing body 2. The casing body 2 has a wall opposite to the opening, and / or the cover plate body 3 has a working through hole for welding tabs. The working through hole has a stepped structure including a first hole segment and a second hole segment, and a limiting step 100 is formed between the first hole segment and the second hole segment. The sealing plate 1 includes a sealing part 11 and an insertion part 12. The insertion part 12 is inserted into the second hole segment, and the sealing part 11 is inserted into the first hole segment and abuts against the limiting step 100. The sealing part 11 is welded to the casing body 2 and / or the cover plate body 3 to close the working through hole.

[0040] When the closure 11 and the outer shell body 2, and / or the cover plate body 3 are butt welded, the thickness dimension of the limiting step 100 along the first direction is T1, and satisfies 0.3mm≤T1≤0.8H;

[0041] When the closed part 11 and the outer shell body 2, and / or the cover plate body 3 are through welded, the thickness dimension of the limiting step 100 along the first direction is T2, and satisfies 0.5mm≤T2≤0.8H, where H is the thickness dimension of the wall surface of the outer shell body 2 opposite to the opening or the cover plate body 3 along the first direction.

[0042] The battery casing is provided with a sealing plate 1 consisting of a plug-in part 12 and a sealing part 11. A stepped working through-hole is formed on the wall surface of the casing body 2 opposite to the opening, and / or on the cover plate body 3. When the sealing plate 1 closes the working through-hole, the plug-in part 12 is inserted into the second hole segment, and the sealing part 11 is inserted into the first hole segment, abutting against the limiting step 100. This increases the contact area and improves the sealing performance of the working through-hole. Furthermore, by limiting the thickness of the limiting step 100 under different welding methods, it satisfies 0.3mm≤T1≤0.8H during butt welding and 0.5mm≤T2≤0.8H during penetration welding. This avoids both excessive thickness of the limiting step 100, which would result in insufficient welding depth and affect welding strength, and insufficient thickness of the limiting step 100, which would lead to easy deformation and inability to provide effective structural support for the sealing part 11.

[0043] In this embodiment, the reason why the lower limit of the thickness of the limiting step 100 for the seam welding is less than the lower limit of the thickness of the limiting step 100 for the through welding is that the through welding method requires more thickness to avoid the limiting step 100 being welded through. Therefore, it is necessary to ensure that the limiting step 100 has a greater thickness during through welding.

[0044] The battery casing can be adapted to different types of batteries, such as blade batteries or prismatic batteries. In addition, the battery casing can be configured into various structures of blade batteries or prismatic batteries by the number of openings in the casing body 2 and the number of cover bodies 3. For example, a blade battery with openings on both sides of the casing body 2 and double cover bodies 3, or a blade battery with openings on one side of the casing body 2 and single cover bodies 3, or a prismatic battery with openings on one side of the casing body 2 and single cover bodies 3, etc. The working through hole can be set separately on the casing body 2, or separately on the cover body 3, or both the cover body 3 and the casing body 2 can be provided with working through holes.

[0045] Optionally, such as Figure 1 As shown, when the closure 11 and the outer shell 2, and / or the cover plate 3 are butt-welded, the width dimension of the limiting step 100 along the second direction is L1, and satisfies 0.5mm≤L1≤20mm. By limiting the width dimension L1 of the limiting step 100 along the second direction when butt-welding is used, so that it satisfies 0.5mm≤L1≤20mm, on the one hand, the width of the limiting step 100 is not too small, which would not provide enough transverse welding area during welding, resulting in defects such as cratering and weld breaks, thus reducing welding quality. On the other hand, the width of the limiting step 100 along the second direction is not too large, which would cause dimensional redundancy and waste materials.

[0046] In this embodiment, the width L1 of the limiting step 100 along the second direction can be any value between 0.5mm and 20mm or a range between any two values, such as 0.5mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, etc.

[0047] Optionally, such as Figure 2 As shown, when the closure 11 and the outer shell body 2, and / or the cover plate body 3 are welded together, the width dimension of the limiting step 100 along the second direction is L2, and satisfies 1mm≤L2≤20mm. By limiting the width dimension L2 of the limiting step 100 along the second direction when using through welding, so that it satisfies 1mm≤L2≤20mm, on the one hand, the width of the limiting step 100 is not too small, which would not provide enough transverse welding area during welding, resulting in defects such as cratering and weld breakage, thus reducing welding quality. On the other hand, the width of the limiting step 100 along the second direction is not too large, which would cause dimensional redundancy and waste materials.

[0048] In this embodiment, the width L2 of the limiting step 100 along the second direction can be any value between 1mm and 20mm or a range between any two values, such as 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, etc.

[0049] It is understandable that the lower limit of the width of the limiting step 100 for butt welding is less than that for through welding because through welding requires welding through the sealing part 11 of the sealing plate 1 to weld to the limiting step 100, while butt welding only completes the welding between the sealing part 11 and the outer shell body 2 or the cover plate body 3, without needing to weld through the limiting step 100. Therefore, when using through welding, more width needs to be reserved to prevent the limiting step 100 from being welded through.

[0050] Optionally, such as Figures 2 to 6 As shown, the outer casing 2 and the wall opposite the opening, and / or the cover plate 3, are provided with mounting bosses 200. The mounting bosses 200 protrude in a first direction away from the electrode tabs, and stepped working through holes are opened on the mounting bosses 200. By providing mounting bosses 200 on the outer casing 2 and the wall opposite the opening, and / or the cover plate 3, the installation height of the sealing plate 1 is increased, thereby avoiding affecting the electrode tabs that have already been welded when welding the sealing plate 1, and ensuring the welding quality of the electrode tabs.

[0051] The mounting boss 200 can be set separately on the wall surface opposite to the opening of the outer shell body 2, or it can be set separately on the cover body 3, or the mounting boss 200 can be set on both the wall surface opposite to the opening of the outer shell body 2 and the cover body 3. The specific setting method can be freely adjusted according to the specific structure of the battery.

[0052] Optionally, such as Figure 1 , Figure 2 As shown, the battery casing also includes a terminal post 4. One end of the terminal post 4 is electrically connected to the tab, and the other end of the terminal post 4 extends out of the casing body 2 and the wall or cover body 3 opposite to the tab. The height of the terminal post 4 extending in the first direction is K, and the height of the mounting boss 200 protruding in the first direction is Y, satisfying 0.1mm≤Y≤K. By limiting the height Y of the mounting boss 200 protruding in the first direction, on the one hand, it avoids the mounting boss 200 protruding too small, resulting in it being too close to the tab, thus affecting the tab that has already been welded when welding the sealing plate 1. On the other hand, it avoids the mounting boss 200 protruding more than the height of the terminal post 4 extending out, thus interfering with the connection and assembly between the terminal post 4 and the busbar.

[0053] Optionally, such as Figure 1 , Figure 2 As shown, the side of the outer shell 2 opposite to the opening, where the wall or cover plate 3 has a mounting boss 200, also has an insulating member 5. The distance between the mounting boss 200 and the insulating member 5 along the second direction is W, and satisfies W≥1mm. By limiting the distance W between the mounting boss 200 and the insulating member 5 along the second direction, it is avoided that the mounting boss 200 and the insulating member 5 are too close, which would cause the high temperature generated during the welding operation between the mounting boss 200 and the sealing plate 1 to melt the insulating member 5, causing the insulating member 5 to deform and resulting in a reduction in insulation.

[0054] Optionally, such as Figure 4 As shown, the distance between the outer edge of the wall opposite the opening of the outer shell body 2 and the mounting boss 200 along the third direction is D1, and satisfies 4mm≤D1≤30mm. Since the mounting boss 200 is stamped from the outer shell body 2, limiting the distance D1 between the outer edge of the wall opposite the opening of the outer shell body 2 and the mounting boss 200 along the third direction serves two purposes: firstly, it prevents the mounting boss 200 from being too close to the outer edge of the wall opposite the opening of the outer shell body 2, which would cause deformation of the wall opposite the opening of the outer shell body 2 after stamping; secondly, it prevents the mounting boss 200 from being too far from the outer edge of the wall opposite the opening of the outer shell body 2, which would increase the overall size of the outer shell body 2 without changing the external dimensions of the mounting boss 200, resulting in dimensional redundancy and increased costs.

[0055] In this embodiment, the distance D1 between the outer edge of the outer wall of the outer shell body 2 opposite to the opening and the mounting boss 200 along a third direction can be any value between 4mm and 30mm or any two values, such as 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, etc.

[0056] Optionally, such as Figure 6 As shown, the distance between the outer edge of the cover plate body 3 and the mounting boss 200 along the third direction is D2, and satisfies 2mm≤D2≤30mm. Since the mounting boss 200 is stamped from the cover plate body 3, limiting the distance D2 between the outer edge of the cover plate body 3 and the mounting boss 200 along the third direction serves two purposes: firstly, it prevents the mounting boss 200 from being too close to the outer edge of the cover plate body 3, which would cause deformation of the cover plate body 3 after stamping; secondly, it prevents the mounting boss 200 from being too far from the outer edge of the cover plate body 3, which would increase the overall size of the cover plate body 3 without changing the external dimensions of the mounting boss 200, resulting in dimensional redundancy and increased costs.

[0057] In this embodiment, the distance D2 between the outer edge of the cover plate body 3 and the mounting boss 200 along a third direction can be any value between 2mm and 30mm or any range between two values, such as 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, etc.

[0058] It is understandable that the distance between the outer edge of the cover plate body 3 and the mounting boss 200 along the third direction is smaller than the distance between the outer edge of the outer shell body 2 and the wall opposite the opening and the mounting boss 200. This is because the outer shell body 2 is made of sheet metal that has been bent. In addition to the wall opposite the opening, there are other walls. Therefore, space needs to be reserved for bending other walls. The cover plate body 3 is just a separate component, so there is no need to consider reserving space for other structures.

[0059] To verify the effect of butt welding of the sealing plate 1 on the outer shell 2 when the sealing part 11 and the outer shell body 2, and / or the cover plate body 3 are butt welded, the following parameters are provided: the thickness T1 of the limiting step 100 along the first direction; the width L1 of the limiting step 100 along the second direction when the sealing part 11 and the outer shell body 2, and / or the cover plate body 3 are butt welded; the height Y of the mounting boss 200 protruding along the first direction; the distance W between the side of the mounting boss 200 facing the insulating member 5 and the insulating member 5 along the second direction; and the distance D1 between the outer edge of the outer shell body 2 and the wall opposite the opening and the mounting boss 200 along the third direction. As shown in Table 1, ten sets of embodiments and eight sets of comparative examples are provided for testing, and the thickness H of the outer shell body 2 and the wall opposite the opening or the cover plate body 3 along the first direction is limited to 2 mm, and the height K of the pole post 4 protruding along the first direction is 3.2 mm.

[0060] Table 1

[0061]

[0062] In Example 1, the dimension W is set to 1 mm, satisfying the range W ≥ 1 mm; the dimension T1 is set to 0.3 mm, satisfying the range 0.3 mm ≤ T1 ≤ 0.8 H; the dimension L1 is set to 0.5 mm, satisfying the range 0.5 mm ≤ L1 ≤ 20 mm; the dimension D1 is set to 4 mm, satisfying the range 4 mm ≤ D1 ≤ 30 mm; and the dimension Y is set to 0.1 mm, satisfying the range 0.1 mm ≤ Y ≤ K. When the sealing plate 1 and the outer shell body 2 are welded together using butt welding, no melting deformation is observed in the insulating component 5; the welding strength meets the pressure test requirement of 1.2 MPa; no explosion points or weld breaks are found; and the outer shell body 2 does not deform after stamping.

[0063] In Example 2, the dimension W is set to 4mm, satisfying the range W≥1mm; the dimension T1 is set to 0.5mm, satisfying the range 0.3mm≤T1≤0.8H; the dimension L1 is set to 3mm, satisfying the range 0.5mm≤L1≤20mm; the dimension D1 is set to 6mm, satisfying the range 4mm≤D1≤30mm; and the dimension Y is set to 0.5mm, satisfying the range 0.1mm≤Y≤K. When the sealing plate 1 and the outer shell body 2 are welded using butt welding, no melting deformation is observed in the insulating component 5; the welding strength meets the pressure test requirement of 1.2MPA; no explosion points or weld breaks are found; and the outer shell body 2 does not deform after stamping.

[0064] In Example 3, the dimension W is set to 8mm, satisfying the range W≥1mm; the dimension T1 is set to 0.6mm, satisfying the range 0.3mm≤T1≤0.8H; the dimension L1 is set to 5mm, satisfying the range 0.5mm≤L1≤20mm; the dimension D1 is set to 8mm, satisfying the range 4mm≤D1≤30mm; and the dimension Y is set to 1mm, satisfying the range 0.1mm≤Y≤K. When the sealing plate 1 and the outer shell body 2 are welded using butt welding, no melting deformation is observed in the insulating component 5; the welding strength meets the pressure test requirement of 1.2MPA; no explosion points or weld breaks are found; and the outer shell body 2 does not deform after stamping.

[0065] In Example 4, the dimension W is set to 12mm, satisfying the range W≥1mm; the dimension T1 is set to 0.8mm, satisfying the range 0.3mm≤T1≤0.8H; the dimension L1 is set to 7mm, satisfying the range 0.5mm≤L1≤20mm; the dimension D1 is set to 12mm, satisfying the range 4mm≤D1≤30mm; and the dimension Y is set to 1.3mm, satisfying the range 0.1mm≤Y≤K. After welding the sealing plate 1 and the outer shell body 2 using butt welding, no melting deformation was observed in the insulating component 5; the welding strength met the pressure test requirement of 1.2MPA; no explosion points or weld breaks were found; and the outer shell body 2 did not deform after stamping.

[0066] In Example 5, the dimension W is set to 16mm, satisfying the range W≥1mm; the dimension T1 is set to 1mm, satisfying the range 0.3mm≤T1≤0.8H; the dimension L1 is set to 9mm, satisfying the range 0.5mm≤L1≤20mm; the dimension D1 is set to 16mm, satisfying the range 4mm≤D1≤30mm; and the dimension Y is set to 1.7mm, satisfying the range 0.1mm≤Y≤K. When the sealing plate 1 and the outer shell body 2 are welded using butt welding, no melting deformation is observed in the insulating component 5; the welding strength meets the pressure test requirement of 1.2MPA; no explosion points or weld breaks are found; and the outer shell body 2 does not deform after stamping.

[0067] In Example 6, the dimension W is set to 20mm, satisfying the range W≥1mm; the dimension T1 is set to 1.2mm, satisfying the range 0.3mm≤T1≤0.8H; the dimension L1 is set to 13mm, satisfying the range 0.5mm≤L1≤20mm; the dimension D1 is set to 21mm, satisfying the range 4mm≤D1≤30mm; and the dimension Y is set to 2mm, satisfying the range 0.1mm≤Y≤K. When the sealing plate 1 and the outer shell body 2 are welded using butt welding, no melting deformation is observed in the insulating component 5; the welding strength meets the pressure test requirement of 1.2MPA; no explosion points or weld breaks are found; and the outer shell body 2 does not deform after stamping.

[0068] In Example 7, the dimension W is set to 30mm, satisfying the range W≥1mm; the dimension T1 is set to 1.4mm, satisfying the range 0.3mm≤T1≤0.8H; the dimension L1 is set to 16mm, satisfying the range 0.5mm≤L1≤20mm; the dimension D1 is set to 25mm, satisfying the range 4mm≤D1≤30mm; and the dimension Y is set to 2.6mm, satisfying the range 0.1mm≤Y≤K. When the sealing plate 1 and the outer shell body 2 are welded using butt welding, no melting deformation is observed in the insulating component 5; the welding strength meets the pressure test requirement of 1.2MPA; no explosion points or weld breaks are found; and the outer shell body 2 does not deform after stamping.

[0069] In Example 8, the dimension W is set to 60mm, satisfying the range W≥1mm; the dimension T1 is set to 1.6mm, satisfying the range 0.3mm≤T1≤0.8H; the dimension L1 is set to 20mm, satisfying the range 0.5mm≤L1≤20mm; the dimension D1 is set to 30mm, satisfying the range 4mm≤D1≤30mm; and the dimension Y is set to 3.2mm, satisfying the range 0.1mm≤Y≤K. When the sealing plate 1 and the outer shell body 2 are welded using butt welding, no melting deformation is observed in the insulating component 5; the welding strength meets the pressure test requirement of 1.2MPA; no explosion points or weld breaks are found; and the outer shell body 2 does not deform after stamping.

[0070] In Example 9, the dimension W is set to 6mm, satisfying the range W≥1mm; the dimension T1 is set to 0.5mm, satisfying the range 0.3mm≤T1≤0.8H; the dimension L1 is set to 3mm, satisfying the range 0.5mm≤L1≤20mm; the dimension D1 is set to 6mm, satisfying the range 4mm≤D1≤30mm; and the dimension Y is set to 1mm, satisfying the range 0.1mm≤Y≤K. When the sealing plate 1 and the outer shell body 2 are welded using butt welding, no melting deformation is observed in the insulating component 5; the welding strength meets the pressure test requirement of 1.2MPA; no explosion points or weld breaks are found; and the outer shell body 2 does not deform after stamping.

[0071] In Example 10, the dimension W is set to 6mm, satisfying the range W≥1mm; the dimension T1 is set to 0.5mm, satisfying the range 0.3mm≤T1≤0.8H; the dimension L1 is set to 3mm, satisfying the range 0.5mm≤L1≤20mm; the dimension D1 is set to 6mm, satisfying the range 4mm≤D1≤30mm; and the dimension Y is set to 2mm, satisfying the range 0.1mm≤Y≤K. When the sealing plate 1 and the outer shell body 2 are welded using butt welding, no melting deformation is observed in the insulating component 5; the welding strength meets the pressure test requirement of 1.2MPA; no explosion points or weld breaks are found; and the outer shell body 2 does not deform after stamping.

[0072] As can be seen from Examples 1 to 10, when the sealing part 11 and the outer shell body 2, and / or the cover plate body 3 are butt-welded, when the thickness T1 of the limiting step 100 along the first direction, the width L1 of the limiting step 100 along the second direction, the height Y of the mounting boss 200 protruding along the first direction, the distance W between the side of the mounting boss 200 facing the insulating member 5 and the insulating member 5 along the second direction, and the distance D1 between the outer edge of the outer shell body 2 and the wall opposite the opening and the mounting boss 200 along the third direction all meet their respective set ranges, then after the sealing plate 1 and the outer shell body 2 are butt-welded, no melting deformation is found in the insulating member 5; the welding strength meets the pressure test under 1.2 MPa; no explosion point or weld break is found; the outer shell body 2 does not deform after stamping, meeting the product's usage requirements.

[0073] In Comparative Example 1, the dimension W is set to 0.5 mm, which does not meet the range of W≥1 mm; the dimension T1 is set to 1 mm, which meets the range of 0.3 mm≤T1≤0.8 H; the dimension L1 is set to 2 mm, which meets the range of 0.5 mm≤L1≤20 mm; the dimension D1 is set to 5 mm, which meets the range of 4 mm≤D1≤30 mm; and the dimension Y is set to 2 mm, which meets the range of 0.1 mm≤Y≤K. At this time, after welding the sealing plate 1 and the outer shell body 2 by butt welding, it is found that the insulating part 5 melts and deforms.

[0074] In Comparative Example 2, the dimension W is set to 2mm, which satisfies the range W≥1mm; the dimension T1 is set to 0.2mm, which does not satisfy the range 0.3mm≤T1≤0.8H; the dimension L1 is set to 2mm, which satisfies the range 0.5mm≤L1≤20mm; the dimension D1 is set to 5mm, which satisfies the range 4mm≤D1≤30mm; and the dimension Y is set to 2mm, which satisfies the range 0.1mm≤Y≤K. When the sealing plate 1 and the outer shell body 2 are welded together by butt welding, it is found that the limiting step 100 is deformed.

[0075] As can be seen from Comparative Example 2, when the thickness T1 of the limiting step 100 along the first direction is less than the minimum value of the set range 0.3mm≤T1≤0.8H, the thickness of the limiting step 100 is too small, which results in insufficient structural strength during welding operations, leading to deformation.

[0076] In Comparative Example 3, the dimension W is set to 2mm, satisfying the range W≥1mm; the dimension T1 is set to 1mm, satisfying the range 0.3mm≤T1≤0.8H; the dimension L1 is set to 0.2mm, not satisfying the range 0.5mm≤L1≤20mm; the dimension D1 is set to 5mm, satisfying the range 4mm≤D1≤30mm; and the dimension Y is set to 2mm, satisfying the range 0.1mm≤Y≤K. When the sealing plate 1 and the outer shell body 2 are welded together using butt welding, bursting points and broken welds are found, with a defect rate >10%.

[0077] As can be seen from Comparative Example 3, when the width L1 of the limiting step 100 along the second direction is less than the minimum value of the set range 0.5mm≤L1≤20mm, the limiting step 100 cannot provide a sufficient transverse welding area for welding, which leads to defects such as blasting and weld breakage during welding.

[0078] In Comparative Example 4, the dimension W is set to 2mm, satisfying the range W≥1mm; the dimension T1 is set to 1mm, satisfying the range 0.3mm≤T1≤0.8H; the dimension L1 is set to 2mm, satisfying the range 0.5mm≤L1≤20mm; the dimension D1 is set to 1mm, not satisfying the range 4mm≤D1≤30mm; and the dimension Y is set to 2mm, satisfying the range 0.1mm≤Y≤K. At this time, deformation occurs after the outer shell body 2 is stamped.

[0079] As can be seen from Comparative Example 4, when the distance D1 between the outer edge of the wall opposite the opening of the outer shell body 2 and the mounting boss 200 along the third direction is less than the minimum value of the set range 4mm≤D1≤30mm, the mounting boss 200 is too close to the outer edge of the outer shell body 2, causing the wall opposite the opening of the outer shell body 2 to deform after stamping.

[0080] In Comparative Example 5, the dimension W is set to 6mm, which satisfies the range W≥1mm; the dimension T1 is set to 1.8mm, which does not satisfy the range 0.3mm≤T1≤0.8H; the dimension L1 is set to 3mm, which satisfies the range 0.5mm≤L1≤20mm; the dimension D1 is set to 6mm, which satisfies the range 4mm≤D1≤30mm; and the dimension Y is set to 2mm, which satisfies the range 0.1mm≤Y≤K. At this time, after welding the sealing plate 1 and the outer shell body 2 with butt weld, the weld strength does not meet the pressure test of 1.2MPA.

[0081] As can be seen from Comparative Example 5, since the thickness H of the outer shell body 2 and the wall or cover body 3 opposite to the opening along the first direction is 2mm, the upper limit of T1 is 1.6mm. When the thickness T1 of the limiting step 100 along the first direction is 1.8mm, it is greater than the maximum value of the set range 0.3mm≤T1≤0.8H. At this time, the thickness of the limiting step 100 is too large, resulting in the welding depth reserved for welding being too small, and the welding strength does not meet the pressure test under 1.2MPA.

[0082] In Comparative Example 6, the dimension W is set to 6mm, satisfying the range W≥1mm; the dimension T1 is set to 1mm, satisfying the range 0.3mm≤T1≤0.8H; the dimension L1 is set to 25mm, which does not satisfy the range 0.5mm≤L1≤20mm; the dimension D1 is set to 6mm, satisfying the range 4mm≤D1≤30mm; and the dimension Y is set to 2mm, satisfying the range 0.1mm≤Y≤K. At this time, the dimension of the limiting step 100 is too large, resulting in dimensional redundancy and high cost.

[0083] As can be seen from Comparative Example 6, when the width L1 of the limiting step 100 along the second direction is greater than the maximum value of the set range 0.5mm≤L1≤20mm, the size of the limiting step 100 is too large, resulting in size redundancy and high cost.

[0084] In Comparative Example 7, the dimension W is set to 6mm, satisfying the range W≥1mm; the dimension T1 is set to 1mm, satisfying the range 0.3mm≤T1≤0.8H; the dimension L1 is set to 3mm, satisfying the range 0.5mm≤L1≤20mm; the dimension D1 is set to 50mm, which does not satisfy the range 4mm≤D1≤30mm; and the dimension Y is set to 2mm, satisfying the range 0.1mm≤Y≤K. At this time, the size of the outer shell body 2 is too large, resulting in size redundancy and high cost.

[0085] As can be seen from Comparative Example 7, when the distance D1 between the outer edge of the outer wall of the outer shell body 2 and the wall opposite the opening and the mounting boss 200 along the third direction is greater than the maximum value of the set range 4mm≤D1≤30mm, the mounting boss 200 is too far from the outer edge of the outer shell body 2, resulting in the outer shell body 2 being too large, having dimensional redundancy, and high cost.

[0086] In Comparative Example 8, the dimension W is set to 6 mm, satisfying the range W ≥ 1 mm; the dimension T1 is set to 1 mm, satisfying the range 0.3 mm ≤ T1 ≤ 0.8 H; the dimension L1 is set to 3 mm, satisfying the range 0.5 mm ≤ L1 ≤ 20 mm; the dimension D1 is set to 6 mm, satisfying the range 4 mm ≤ D1 ≤ 30 mm; and the dimension Y is set to 4 mm, satisfying the range 0.1 mm ≤ Y ≤ K. At this time, the interference pole 4 is connected to the busbar.

[0087] As can be seen from Comparative Example 8, since the height dimension K of the pole post 4 extending along the first direction is 3.2mm, the upper limit of Y is 3.2mm. When the height Y of the mounting boss 200 protruding along the first direction is greater than the maximum value of the set range 0.1mm≤Y≤K, the height of the mounting boss 200 protruding is greater than the height of the pole post 4. As a result, when the pole post 4 is welded to the busbar, the pole post 4 cannot be connected to the busbar due to the obstruction of the mounting boss 200.

[0088] To verify the effect of through welding of the sealing plate 1 on the outer shell 2, ten sets of embodiments and eight sets of comparative examples are provided for testing, as shown in Table 1. The thickness dimension T2 of the limiting step 100 along the first direction, the width dimension L2 of the limiting step 100 along the second direction, the height Y of the mounting boss 200 protruding along the first direction, the distance dimension W between the side of the mounting boss 200 facing the insulating member 5 and the insulating member 5 along the second direction, and the distance dimension D1 between the outer edge of the outer shell 2 and the wall opposite the opening and the mounting boss 200 along the third direction are all considered when the sealing part 11 and the outer shell 2, and / or the cover plate 3 are through welded. The thickness dimension H of the outer shell 2 and the wall opposite the opening or the cover plate 3 along the first direction is limited to 2 mm, and the height dimension K of the pole post 4 protruding along the first direction is 3.2 mm.

[0089] Table 2

[0090]

[0091] In Example 11, the dimension W is set to 1 mm, satisfying the range W ≥ 1 mm; the dimension T1 is set to 0.5 mm, satisfying the range 0.5 mm ≤ T1 ≤ 0.8 H; the dimension L1 is set to 1 mm, satisfying the range 1 mm ≤ L1 ≤ 20 mm; the dimension D1 is set to 4 mm, satisfying the range 4 mm ≤ D1 ≤ 30 mm; and the dimension Y is set to 0.1 mm, satisfying the range 0.1 mm ≤ Y ≤ K. When the sealing plate 1 and the outer shell body 2 are welded together using butt welding, no melting deformation is observed in the insulating component 5; the welding strength meets the pressure test requirement of 1.2 MPa; no explosion points or weld breaks are found; and the outer shell body 2 does not deform after stamping.

[0092] In Example 12, the dimension W is set to 4mm, satisfying the range W≥1mm; the dimension T1 is set to 0.6mm, satisfying the range 0.5mm≤T1≤0.8H; the dimension L1 is set to 2mm, satisfying the range 1mm≤L1≤20mm; the dimension D1 is set to 6mm, satisfying the range 4mm≤D1≤30mm; and the dimension Y is set to 0.5mm, satisfying the range 0.1mm≤Y≤K. When the sealing plate 1 and the outer shell body 2 are welded using butt welding, no melting deformation is observed in the insulating component 5; the welding strength meets the pressure test requirement of 1.2MPA; no explosion points or weld breaks are found; and the outer shell body 2 does not deform after stamping.

[0093] In Example 13, the dimension W is set to 8mm, satisfying the range W≥1mm; the dimension T1 is set to 0.7mm, satisfying the range 0.5mm≤T1≤0.8H; the dimension L1 is set to 5mm, satisfying the range 1mm≤L1≤20mm; the dimension D1 is set to 8mm, satisfying the range 4mm≤D1≤30mm; and the dimension Y is set to 1mm, satisfying the range 0.1mm≤Y≤K. When the sealing plate 1 and the outer shell body 2 are welded using butt welding, no melting deformation is observed in the insulating component 5; the welding strength meets the pressure test requirement of 1.2MPA; no explosion points or weld breaks are found; and the outer shell body 2 does not deform after stamping.

[0094] In Example 14, the dimension W is set to 12mm, satisfying the range W≥1mm; the dimension T1 is set to 0.8mm, satisfying the range 0.5mm≤T1≤0.8H; the dimension L1 is set to 7mm, satisfying the range 1mm≤L1≤20mm; the dimension D1 is set to 12mm, satisfying the range 4mm≤D1≤30mm; and the dimension Y is set to 1.3mm, satisfying the range 0.1mm≤Y≤K. After welding the sealing plate 1 and the outer shell body 2 using butt welding, no melting deformation was found in the insulating component 5; the welding strength met the pressure test under 1.2MPA; no explosion points or weld breaks were found; and the outer shell body 2 did not deform after stamping.

[0095] In Example 15, the dimension W is set to 16mm, satisfying the range W≥1mm; the dimension T1 is set to 1mm, satisfying the range 0.5mm≤T1≤0.8H; the dimension L1 is set to 9mm, satisfying the range 1mm≤L1≤20mm; the dimension D1 is set to 16mm, satisfying the range 4mm≤D1≤30mm; and the dimension Y is set to 1.7mm, satisfying the range 0.1mm≤Y≤K. When the sealing plate 1 and the outer shell body 2 are welded using butt welding, no melting deformation is observed in the insulating component 5; the welding strength meets the pressure test requirement of 1.2MPA; no explosion points or weld breaks are found; and the outer shell body 2 does not deform after stamping.

[0096] In Example 16, the dimension W is set to 20mm, satisfying the range W≥1mm; the dimension T1 is set to 1.2mm, satisfying the range 0.5mm≤T1≤0.8H; the dimension L1 is set to 13mm, satisfying the range 1mm≤L1≤20mm; the dimension D1 is set to 21mm, satisfying the range 4mm≤D1≤30mm; and the dimension Y is set to 2mm, satisfying the range 0.1mm≤Y≤K. When the sealing plate 1 and the outer shell body 2 are welded using butt welding, no melting deformation is observed in the insulating component 5; the welding strength meets the pressure test requirement of 1.2MPA; no explosion points or weld breaks are found; and the outer shell body 2 does not deform after stamping.

[0097] In Example 17, the dimension W is set to 30mm, satisfying the range W≥1mm; the dimension T1 is set to 1.4mm, satisfying the range 0.5mm≤T1≤0.8H; the dimension L1 is set to 17mm, satisfying the range 1mm≤L1≤20mm; the dimension D1 is set to 26mm, satisfying the range 4mm≤D1≤30mm; and the dimension Y is set to 2.6mm, satisfying the range 0.1mm≤Y≤K. When the sealing plate 1 and the outer shell body 2 are welded together using butt welding, no melting deformation is observed in the insulating component 5; the welding strength meets the pressure test requirement of 1.2MPA; no explosion points or weld breaks are found; and the outer shell body 2 does not deform after stamping.

[0098] In Example 18, the dimension W is set to 60mm, satisfying the range W≥1mm; the dimension T1 is set to 1.6mm, satisfying the range 0.5mm≤T1≤0.8H; the dimension L1 is set to 20mm, satisfying the range 1mm≤L1≤20mm; the dimension D1 is set to 30mm, satisfying the range 4mm≤D1≤30mm; and the dimension Y is set to 3.2mm, satisfying the range 0.1mm≤Y≤K. When the sealing plate 1 and the outer shell body 2 are welded using butt welding, no melting deformation is observed in the insulating component 5; the welding strength meets the pressure test requirement of 1.2MPA; no explosion points or weld breaks are found; and the outer shell body 2 does not deform after stamping.

[0099] In Example 19, the dimension W is set to 6mm, satisfying the range W≥1mm; the dimension T1 is set to 0.5mm, satisfying the range 0.5mm≤T1≤0.8H; the dimension L1 is set to 3mm, satisfying the range 1mm≤L1≤20mm; the dimension D1 is set to 6mm, satisfying the range 4mm≤D1≤30mm; and the dimension Y is set to 1mm, satisfying the range 0.1mm≤Y≤K. When the sealing plate 1 and the outer shell body 2 are welded using butt welding, no melting deformation is observed in the insulating component 5; the welding strength meets the pressure test requirement of 1.2MPA; no explosion points or weld breaks are found; and the outer shell body 2 does not deform after stamping.

[0100] In Example 20, the dimension W is set to 6mm, satisfying the range W≥1mm; the dimension T1 is set to 0.5mm, satisfying the range 0.5mm≤T1≤0.8H; the dimension L1 is set to 3mm, satisfying the range 1mm≤L1≤20mm; the dimension D1 is set to 6mm, satisfying the range 4mm≤D1≤30mm; and the dimension Y is set to 2mm, satisfying the range 0.1mm≤Y≤K. When the sealing plate 1 and the outer shell body 2 are welded using butt welding, no melting deformation is observed in the insulating component 5; the welding strength meets the pressure test requirement of 1.2MPA; no explosion points or weld breaks are found; and the outer shell body 2 does not deform after stamping.

[0101] As can be seen from Examples 11 to 20, when the sealing part 11 and the outer shell body 2, and / or the cover plate body 3 are butt-welded, when the thickness T1 of the limiting step 100 along the first direction, the width L1 of the limiting step 100 along the second direction, the height Y of the mounting boss 200 protruding along the first direction, the distance W between the side of the mounting boss 200 facing the insulating member 5 and the insulating member 5 along the second direction, and the distance D1 between the outer edge of the outer shell body 2 and the wall opposite the opening and the mounting boss 200 along the third direction all meet their respective set ranges, then after the sealing plate 1 and the outer shell body 2 are butt-welded, no melting deformation is found in the insulating member 5; the welding strength meets the pressure test under 1.2 MPa; no explosion point or weld break is found; the outer shell body 2 does not deform after stamping, meeting the product's usage requirements.

[0102] In Comparative Example 9, the dimension W is set to 0.5 mm, which does not satisfy the range W≥1 mm; the dimension T1 is set to 1 mm, which satisfies the range 0.5 mm≤T1≤0.8 H; the dimension L1 is set to 2 mm, which satisfies the range 1 mm≤L1≤20 mm; the dimension D1 is set to 5 mm, which satisfies the range 4 mm≤D1≤30 mm; and the dimension Y is set to 2 mm, which satisfies the range 0.1 mm≤Y≤K. At this time, after welding the sealing plate 1 and the outer shell body 2 by butt welding, it is found that the insulating part 5 melts and deforms.

[0103] In Comparative Example 10, the dimension W is set to 2mm, which satisfies the range W≥1mm; the dimension T1 is set to 0.2mm, which does not satisfy the range 0.5mm≤T1≤0.8H; the dimension L1 is set to 2mm, which satisfies the range 1mm≤L1≤20mm; the dimension D1 is set to 5mm, which satisfies the range 4mm≤D1≤30mm; and the dimension Y is set to 2mm, which satisfies the range 0.1mm≤Y≤K. When the sealing plate 1 and the outer shell body 2 are welded together by butt welding, it is found that the limiting step 100 is deformed.

[0104] As can be seen from Comparative Example 10, when the thickness T1 of the limiting step 100 along the first direction is less than the minimum value of the set range 0.3mm≤T1≤0.8H, the thickness of the limiting step 100 is too small, which results in insufficient structural strength during welding operations, leading to deformation.

[0105] In Comparative Example 11, the dimension W is set to 2mm, satisfying the range W≥1mm; the dimension T1 is set to 1mm, satisfying the range 0.5mm≤T1≤0.8H; the dimension L1 is set to 0.2mm, not satisfying the range 1mm≤L1≤20mm; the dimension D1 is set to 5mm, satisfying the range 4mm≤D1≤30mm; and the dimension Y is set to 2mm, satisfying the range 0.1mm≤Y≤K. When the sealing plate 1 and the outer shell body 2 are welded by butt welding, bursting points and broken welds are found, and the defect rate is >10%.

[0106] As can be seen from Comparative Example 11, when the width L1 of the limiting step 100 along the second direction is less than the minimum value of the set range 0.5mm≤L1≤20mm, the limiting step 100 cannot provide a sufficient transverse welding area for welding, which leads to defects such as blasting and weld breakage during welding.

[0107] In Comparative Example 12, the dimension W is set to 2mm, satisfying the range W≥1mm; the dimension T1 is set to 1mm, satisfying the range 0.5mm≤T1≤0.8H; the dimension L1 is set to 2mm, satisfying the range 1mm≤L1≤20mm; the dimension D1 is set to 1mm, not satisfying the range 4mm≤D1≤30mm; and the dimension Y is set to 2mm, satisfying the range 0.1mm≤Y≤K. At this time, deformation occurs after the outer shell body 2 is stamped.

[0108] As can be seen from Comparative Example 12, when the distance D1 between the outer edge of the wall opposite the opening of the outer shell body 2 and the mounting boss 200 along the third direction is less than the minimum value of the set range 4mm≤D1≤30mm, the mounting boss 200 is too close to the outer edge of the outer shell body 2, causing the wall opposite the opening of the outer shell body 2 to deform after stamping.

[0109] In Comparative Example 13, the dimension W is set to 6mm, which satisfies the range W≥1mm; the dimension T1 is set to 1.8mm, which does not satisfy the range 0.5mm≤T1≤0.8H; the dimension L1 is set to 3mm, which satisfies the range 1mm≤L1≤20mm; the dimension D1 is set to 6mm, which satisfies the range 4mm≤D1≤30mm; and the dimension Y is set to 2mm, which satisfies the range 0.1mm≤Y≤K. At this time, after welding the sealing plate 1 and the outer shell body 2 with butt weld, the weld strength does not meet the pressure test of 1.2MPA.

[0110] As can be seen from Comparative Example 13, since the thickness H of the outer shell body 2 and the wall or cover body 3 opposite to the opening along the first direction is 2mm, the upper limit of T1 is 1.6mm. When the thickness T1 of the limiting step 100 along the first direction is 1.8mm, it is greater than the maximum value of the set range 0.3mm≤T1≤0.8H. At this time, the thickness of the limiting step 100 is too large, resulting in the welding depth reserved for welding being too small, and the welding strength does not meet the pressure test under 1.2MPA.

[0111] In Comparative Example 14, the dimension W is set to 6mm, which satisfies the range W≥1mm; the dimension T1 is set to 1mm, which satisfies the range 0.5mm≤T1≤0.8H; the dimension L1 is set to 25mm, which does not satisfy the range 1mm≤L1≤20mm; the dimension D1 is set to 6mm, which satisfies the range 4mm≤D1≤30mm; and the dimension Y is set to 2mm, which satisfies the range 0.1mm≤Y≤K. At this time, the dimension of the limiting step 100 is too large, resulting in dimensional redundancy and high cost.

[0112] As can be seen from Comparative Example 14, when the width L1 of the limiting step 100 along the second direction is greater than the maximum value of the set range 0.5mm≤L1≤20mm, the size of the limiting step 100 is too large, resulting in size redundancy and high cost.

[0113] In Comparative Example 15, the dimension W is set to 6mm, satisfying the range W≥1mm; the dimension T1 is set to 1mm, satisfying the range 0.5mm≤T1≤0.8H; the dimension L1 is set to 3mm, satisfying the range 1mm≤L1≤20mm; the dimension D1 is set to 50mm, which does not satisfy the range 4mm≤D1≤30mm; and the dimension Y is set to 2mm, satisfying the range 0.1mm≤Y≤K. At this time, the size of the outer shell body 2 is too large, resulting in size redundancy and high cost.

[0114] As can be seen from Comparative Example 15, when the distance D1 between the outer edge of the wall opposite the opening of the outer shell body 2 and the mounting boss 200 along the third direction is greater than the maximum value of the set range 4mm≤D1≤30mm, the mounting boss 200 is too far from the outer edge of the outer shell body 2, resulting in the outer shell body 2 being too large, having dimensional redundancy, and high cost.

[0115] In Comparative Example 16, the dimension W is set to 6 mm, satisfying the range W ≥ 1 mm; the dimension T1 is set to 1 mm, satisfying the range 0.5 mm ≤ T1 ≤ 0.8 H; the dimension L1 is set to 3 mm, satisfying the range 1 mm ≤ L1 ≤ 20 mm; the dimension D1 is set to 6 mm, satisfying the range 4 mm ≤ D1 ≤ 30 mm; and the dimension Y is set to 4 mm, satisfying the range 0.1 mm ≤ Y ≤ K. At this time, the interference pole 4 is connected to the busbar.

[0116] As can be seen from Comparative Example 16, since the height dimension K of the pole post 4 extending along the first direction is 3.2mm, the upper limit of Y is 3.2mm. When the height Y of the mounting boss 200 protruding along the first direction is greater than the maximum value of the set range 0.1mm≤Y≤K, the height of the mounting boss 200 protruding is greater than the height of the pole post 4. As a result, when the pole post 4 is welded to the busbar, the pole post 4 cannot be connected to the busbar due to the obstruction of the mounting boss 200.

[0117] Optionally, such as Figure 1 As shown, a first bevel is formed on the inner wall of the first hole section, and a second bevel corresponding to the first bevel is formed on the sealing plate 1. The first bevel and the second bevel together form a welding space for butt welding. By forming a first bevel on the inner wall of the first hole section and a second bevel corresponding to the first bevel on the sealing plate 1, sufficient welding area is provided for butt welding, ensuring the structural strength after butt welding.

[0118] In this embodiment, a battery is also provided, which includes an electrode assembly and the aforementioned battery casing, with the electrode assembly disposed within the battery casing. By using the aforementioned battery casing, this battery ensures the welding strength and quality of the working window for welding the electrode tabs, avoids exposure of the electrode tabs due to insufficient welding strength, improves the protective performance of the electrode tabs, and enhances product quality.

[0119] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A battery casing, characterized in that, The battery casing includes a sealing plate, a casing body with an opening, and a cover plate body for closing the opening of the casing body. The casing body has a wall opposite to the opening, and / or the cover plate body has a working through hole for welding tabs. The working through hole has a stepped structure including a first hole segment and a second hole segment, and a limiting step is formed between the first hole segment and the second hole segment. The sealing plate includes a sealing part and an insertion part. The insertion part is inserted into the second hole segment, and the sealing part is inserted into the first hole segment and abuts against the limiting step. The sealing part is welded to the casing body, and / or the cover plate body, for closing the working through hole. When the closure part and the outer shell body, and / or the cover plate body are butt-welded, the thickness of the limiting step along the first direction is T1, and satisfies 0.3mm≤T1≤0.8H; When the closure part and the outer shell body, and / or the cover plate body are through welded, the thickness of the limiting step along the first direction is T2, and satisfies 0.5mm≤T2≤0.8H, where H is the thickness of the wall surface of the outer shell body opposite to the opening or the cover plate body along the first direction. When the closure part and the outer shell body, and / or the cover plate body are butt welded, the width dimension of the limiting step along the second direction is L1, and satisfies 2mm≤L1≤20mm; When the closure part and the outer shell body, and / or the cover plate body are through welded, the width dimension of the limiting step along the second direction is L2, and satisfies 3mm≤L2≤20mm; The outer casing body and the wall opposite the opening, and / or the cover plate body are provided with a mounting boss, the mounting boss protrudes in the first direction away from the electrode ear, and the working through hole of the stepped structure is opened on the mounting boss; The battery casing also includes a terminal post, one end of which is electrically connected to the tab, and the other end of which extends out of the wall surface opposite the opening of the casing body or the surface of the cover plate body away from the tab. The height of the terminal post extending along the first direction is K, and the height of the mounting boss protruding along the first direction is Y, and satisfies 0.1mm≤Y≤K.

2. The battery casing according to claim 1, characterized in that, An insulating component is also provided on the wall surface opposite the opening of the outer shell body or on the side of the cover plate body where the mounting boss is provided. The distance between the side of the mounting boss facing the insulating component and the insulating component along the second direction is W, and satisfies that W≥1mm.

3. The battery casing according to claim 1, characterized in that, The distance between the outer edge of the outer shell body and the wall opposite the opening and the mounting boss along the third direction is D1, and satisfies 4mm≤D1≤30mm.

4. The battery casing according to claim 1, characterized in that, The distance between the outer edge of the cover plate body and the mounting boss along the third direction is D2, and satisfies 2mm≤D2≤30mm.

5. The battery casing according to claim 1, characterized in that, A first bevel is formed on the inner wall of the first hole section, and a second bevel corresponding to the first bevel is formed on the sealing plate. The first bevel and the second bevel together form a welding space for butt welding.

6. A battery, characterized in that, The battery includes an electrode assembly and a battery casing as described in any one of claims 1-5, wherein the electrode assembly is disposed within the battery casing.

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