A tooling for shaping the slots of a battery steel casing

Abstract

This utility model relates to a tooling for shaping the groove of a battery steel shell, comprising: an upper mold fixed to the movable end of a stamping equipment; and a lower mold consisting of two semi-circular mold bodies that are fitted together, each semi-circular mold body having a stepped shaping part at its center, the stepped shaping part including a continuously connected upper flat section and a lower arc-shaped section; the lower mold is fixed to the fixed end of the stamping equipment and is fitted outside the groove position of the steel shell. The stepped shaping parts of the two semi-circular mold bodies fit together to form a mold cavity, through which the groove of the steel shell is formed into a composite structure of an upper flat groove and a lower arc-shaped groove. This utility model, through the design of the stepped shaping part of the lower mold, enables the groove of the steel shell to form a composite structure of an upper flat groove and a lower arc-shaped groove. This structure achieves surface contact with the cap during sealing, significantly increasing the support area, effectively dispersing the sealing pressure, effectively reducing leakage at the sealing ring, and ensuring reliable sealing.

Description

Technical Field

[0001] This utility model belongs to the field of new energy battery assembly technology, specifically relating to a tooling for shaping the groove of a battery steel shell. Background Technology

[0002] Cylindrical lithium-ion batteries are widely used in energy storage systems and electric vehicles due to their compact structure and flexible assembly capabilities. The reliability of the battery's sealing is crucial for ensuring overall safety and performance, with the design of the slot structure in the steel casing directly affecting the sealing effect of the cap and battery life. As battery energy density and safety requirements increase, optimizing the slot processing technology has become an urgent issue for the industry.

[0003] In existing technologies, the slots in the steel casing of cylindrical batteries generally adopt an arc-shaped structure, such as... Figure 1 As shown, it is formed in one step using a stamping die. This design typically includes grooving, closing, and sealing steps in the process flow, aiming to simplify processing and utilize the material's ductility. However, the groove shape results in line contact with the cap (at point a), causing pressure to concentrate in a narrow area. This design is prone to causing localized concave deformation of the cap, leading to defects such as uneven compression of the sealing ring and displacement of the explosion-proof sheet under pressure. In severe cases, it can lead to electrolyte leakage and battery safety failure. Utility Model Content

[0004] To address the aforementioned problems in the existing technology, this utility model provides a battery steel casing slot shaping fixture. The technical problem to be solved by this utility model is achieved through the following technical solution:

[0005] This utility model provides a tooling for shaping the slot of a battery steel shell, including: an upper mold fixed to the movable end of a stamping equipment; and a lower mold consisting of two semi-circular mold bodies that are fitted together, each semi-circular mold body having a stepped shaping part at its center, the stepped shaping part including a continuously connected upper flat section and a lower arc-shaped section; the lower mold is fixed to the fixed end of the stamping equipment, and the lower mold is sleeved on the outside of the slot of the steel shell, the stepped shaping parts of the two semi-circular mold bodies fit together to form a mold cavity, through which the slot of the steel shell is formed into a composite structure of an upper flat slot and a lower arc-shaped slot.

[0006] In one embodiment of the present invention, the upper mold is provided with an annular locking groove, and the upper mold is fixed to the movable end of the stamping equipment by the annular locking groove and the locking screw.

[0007] In one embodiment of this utility model, a through hole is provided in the middle of the upper mold.

[0008] In one embodiment of this utility model, the bottom edge of the upper mold is provided with rounded corners, and the upper mold is driven by the movable end of the stamping equipment to apply vertical pressure to the inside of the slot of the steel shell.

[0009] In one embodiment of this utility model, each semi-circular mold body has an arc-shaped groove on its inner side, the diameter of the arc-shaped groove is matched with the outer diameter of the steel shell, and the step shaping part is disposed on the upper part of the arc-shaped groove.

[0010] In one embodiment of this utility model, each of the semi-circular mold bodies is provided with a plurality of bolt through holes evenly spaced, and the semi-circular mold body is fixed to the fixed end of the stamping equipment by a plurality of bolts passing through the plurality of bolt through holes.

[0011] In one embodiment of this utility model, the upper flat groove of the groove of the steel shell after shaping is in contact with the plane of the cap.

[0012] In one embodiment of this utility model, the depth of the upper flat groove The depth range is: ,in, The depth of the groove in the steel shell.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] This utility model discloses a battery steel shell slot shaping fixture. Through the stepped shaping section design of the lower mold, the slot of the steel shell forms a composite structure with a flat upper slot and an arc lower slot. This structure achieves surface contact with the cap during sealing, significantly increasing the support area, effectively dispersing sealing pressure, avoiding inward deformation of the cap caused by localized stress concentration, and facilitating uniform compression of the cap's sealing ring. This effectively reduces leakage at the sealing ring, ensuring reliable sealing and improving battery safety and sealing reliability. Simultaneously, this fixture optimizes the slot shape, helping to maintain battery consistency and improving assembly precision and product appearance quality.

[0015] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a steel casing slot for an existing battery.

[0017] Figure 2 This is a schematic diagram of the upper mold provided in an embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram of the structure of the lower mold provided in an embodiment of this utility model;

[0019] Figure 4 This is a front view of the lower mold provided in this embodiment of the utility model;

[0020] Figure 5 This is a schematic diagram of the assembly structure of the battery steel shell slot shaping fixture provided in this embodiment of the utility model;

[0021] Figure 6 This is a schematic diagram of the groove structure obtained by using the battery steel shell groove shaping tool of this utility model.

[0022] Reference numerals: 100-Upper mold; 110-Annular locking groove; 120-Through hole; 200-Lower mold; 210-Step shaping part; 220-Arc-shaped groove; 230-Bolt through hole; 10-Steel shell; 20-Cap. Detailed Implementation

[0023] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the following describes in detail a battery steel shell slot shaping fixture proposed according to this utility model, in conjunction with the accompanying drawings and specific embodiments.

[0024] The foregoing and other technical contents, features, and effects of this utility model will be clearly presented in the following detailed description of the specific embodiments with reference to the accompanying drawings. Through the description of the specific embodiments, a more in-depth and specific understanding can be gained of the technical means and effects adopted by this utility model to achieve the intended purpose. However, the accompanying drawings are only provided for reference and illustration and are not intended to limit the technical solution of this utility model.

[0025] Example 1

[0026] like Figure 1 As shown, Figure 1 This is a schematic diagram of an existing battery steel shell slot structure. The arc-shaped slot has the defect of insufficient support area, causing the sealing pressure to concentrate in a narrow area, which can easily lead to electrolyte leakage and battery safety failure. Therefore, this utility model provides a battery steel shell slot shaping fixture. After the existing punching process, the slot is shaped using matching upper mold 100 and lower mold 200, processing the slot into a composite structure of an upper flat slot and a lower arc slot, thereby increasing the contact bearing area between the steel shell 10 and the cap 20.

[0027] like Figures 2 to 6 As shown, Figure 2 This is a schematic diagram of the upper mold provided in an embodiment of the present invention; Figure 3This is a schematic diagram of the structure of the lower mold provided in an embodiment of this utility model; Figure 4 This is a front view of the lower mold provided in this embodiment of the utility model; Figure 5 This is a schematic diagram of the assembly structure of the battery steel shell slot shaping fixture provided in this embodiment of the utility model; Figure 6 This is a schematic diagram of the groove structure obtained by using the battery steel shell groove shaping tool of this utility model.

[0028] In this embodiment, the battery steel shell slot shaping fixture includes: an upper mold 100, fixed to the movable end of the stamping equipment; and a lower mold 200, which consists of two semi-circular mold bodies that are fitted together. Each semi-circular mold body has a stepped shaping part 210 at its center. The stepped shaping part 210 includes a continuously connected upper flat section and a lower arc section. The lower mold 200 is fixed to the fixed end of the stamping equipment and is fitted outside the slot of the steel shell 10. The stepped shaping parts 210 of the two semi-circular mold bodies fit together to form a mold cavity. Through the mold cavity, the slot of the steel shell 10 forms a composite structure of an upper flat slot and a lower arc slot.

[0029] In an optional embodiment, the upper die 100 is provided with an annular locking groove 110. The upper die 100 is fixed to the movable end of the stamping equipment by the annular locking groove 110 and locking screws to ensure that the upper die 100 remains stable during the stamping process, preventing loosening due to equipment vibration or pressure impact, thereby improving operational safety and ensuring accurate force transmission. A through hole 120 is provided in the middle of the upper die 100 to reduce the inertia of the upper die 100 and improve the stamping response speed; at the same time, it serves as a heat dissipation channel to prevent thermal expansion from affecting the forming accuracy during continuous operation. Specifically, the bottom edge of the upper die 100 is provided with rounded corners, such as a radius of 0.3~0.5mm. The upper die 100 is driven by the movable end of the stamping equipment to apply vertical pressure to the inner side of the groove of the steel shell 10. The rounded corner design reduces stress concentration on the inner side of the groove of the steel shell 10 when applying vertical pressure, avoids local tearing or uneven deformation of the material, ensures a smooth groove forming process, and guarantees surface quality.

[0030] In an optional embodiment, each semi-circular mold body has an arc-shaped groove 220 on its inner side, the diameter of which matches the outer diameter of the steel shell 10. A stepped shaping part 210 is disposed on the upper part of the arc-shaped groove 220. For example, each semi-circular mold body has a plurality of bolt through holes 230 evenly spaced on it, and the semi-circular mold body is fixed to the fixed end of the stamping equipment by multiple bolts passing through the multiple bolt through holes 230. Further, the upper flat groove of the groove opening of the shaped steel shell 10 contacts the plane of the cap 20.

[0031] It is worth noting that the mating structure of the two semi-circular mold pieces facilitates the installation, disassembly, and maintenance of the mold, while ensuring precise alignment of the mold body, forming a uniform mold cavity, and improving forming efficiency. The tight fit between the arc-shaped groove 220 and the outer wall of the steel shell 10 stabilizes and fixes the position of the steel shell 10, preventing it from shaking or shifting during forming, and ensuring the accuracy and consistency of the groove forming. The stepped forming part 210 directly acts on the groove position of the steel shell 10, shaping the groove into a composite structure of a flat upper groove and an arc lower groove through the mold cavity, increasing the contact area with the cap 20, thereby dispersing the sealing pressure and reducing the risk of uneven compression of the sealing ring.

[0032] In an optional embodiment, the thickness of the steel shell 10 can be 0.43 mm. Since the upper flat groove is transformed from an arc-shaped groove, considering the stretching of the steel shell 10, the depth of the upper flat groove is... The depth range is: ,in, The depth of the slot in the steel casing 10. This depth range optimizes the slot structure, ensuring that the upper flat slot provides sufficient planar area for surface contact with the cap 20, while retaining the lower arc-shaped section to distribute pressure, effectively reducing electrolyte leakage and enhancing sealing reliability and battery safety. For example, when... At that time, due to the insufficient area of ​​the upper planar segment, the stress dispersion effect is weakened; when If the radius of curvature of the lower arc segment is too small, it can easily lead to necking fracture of the steel shell.

[0033] The working principle of this utility model's battery steel shell slot shaping fixture is as follows: During use, the upper mold 100 is fixed to the movable end of the stamping equipment via an annular locking groove 110 and locking screws. The lower mold 200 consists of two semi-circular mold bodies that are fitted together. These two semi-circular mold bodies are fixed to the fixed end of the stamping equipment via multiple bolts passing through multiple bolt holes 230. The even distribution of the bolt holes 230 and bolts ensures that the lower mold 200 is firmly fixed to the stamping equipment, preventing mold displacement or deformation during stamping and improving shaping accuracy and process reliability. The upper mold 100 fits against the inner side of the steel shell 10, and the lower mold 200 is fixed to the outer side of the steel shell 10 to secure the steel shell 10 and prevent it from shaking. When the moving end of the stamping equipment presses down, the upper die 100 applies vertical pressure to the inner side of the groove of the steel shell 10. The stepped shaping parts 210 of the two semi-circular dies come together to form a die cavity. The die cavity modifies the groove on the outside. Under the pressure of the upper die 100 and the shaping of the lower die 200, the groove of the steel shell 10 deforms, forming a composite structure of an upper flat groove and a lower arc groove, such as... Figure 6 As shown at point b in the middle.

[0034] It is worth noting that, after reshaping, the original line contact between the steel shell 10 and the cap 20 is changed to surface contact. Surface contact transforms the line load into a surface load, and according to Pascal's principle, the pressure distribution tends to be uniform, preventing the cap 20 from concave. The planar support also ensures that the sealing ring (not shown in the figure) is uniformly compressed, eliminating areas of insufficient or excessive compression. Furthermore, the explosion-proof plate (not shown in the figure) of the cap 20 avoids non-uniform compression, and its peripheral support stiffness distribution tends to be consistent, thereby effectively improving the concave cap and reducing the probability of leakage at the sealing ring.

[0035] This utility model discloses a battery steel shell slot shaping fixture. Through the stepped shaping section design of the lower mold, the slot of the steel shell forms a composite structure with a flat upper slot and an arc lower slot. This structure achieves surface contact with the cap during sealing, significantly increasing the support area, effectively dispersing sealing pressure, avoiding inward deformation of the cap caused by localized stress concentration, and facilitating uniform compression of the cap's sealing ring. This effectively reduces leakage at the sealing ring, ensuring reliable sealing and improving battery safety and sealing reliability. Simultaneously, this fixture optimizes the slot shape, helping to maintain battery consistency and improving assembly precision and product appearance quality.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations are intended to cover non-exclusive inclusion, such that an article or device comprising a list of elements includes not only those elements but also other elements not expressly listed. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device comprising said element. Terms such as "connected" or "linked" are not limited to physical or mechanical connections but can include electrical connections, whether direct or indirect. The orientations or positional relationships indicated by terms such as "upper," "lower," "left," and "right" are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0037] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A tooling for shaping the groove of a battery steel casing, characterized in that, include: The upper mold is fixed on the movable end of the stamping equipment; The lower mold consists of two semi-circular mold bodies that are joined together. Each semi-circular mold body has a stepped shaping part at its center. The stepped shaping part includes a continuously connected upper planar section and a lower arc-shaped section. The lower die is fixed on the fixed end of the stamping equipment. The lower die is sleeved on the outside of the groove position of the steel shell. The stepped shaping parts of the two semi-circular dies are joined together to form a die cavity. Through the die cavity, the groove of the steel shell forms a composite structure of upper flat groove and lower arc groove.

2. The battery steel casing slot shaping fixture according to claim 1, characterized in that, The upper mold is provided with an annular locking groove, and the upper mold is fixed to the movable end of the stamping equipment by the annular locking groove and locking screws.

3. The battery steel casing slot shaping fixture according to claim 1, characterized in that, The upper mold has a through hole in the middle.

4. The battery steel casing slot shaping fixture according to claim 1, characterized in that, The bottom edge of the upper mold is rounded, and the upper mold is driven by the movable end of the stamping equipment to apply vertical pressure to the inside of the slot of the steel shell.

5. The battery steel casing slot shaping fixture according to claim 1, characterized in that, Each semi-circular mold has an arc-shaped groove on its inner side, the diameter of which matches the outer diameter of the steel shell, and the step shaping part is located on the upper part of the arc-shaped groove.

6. The battery steel casing slot shaping fixture according to claim 1, characterized in that, Each of the semi-circular mold bodies has multiple bolt holes evenly spaced on it, and the semi-circular mold body is fixed to the fixed end of the stamping equipment by multiple bolts passing through the multiple bolt holes.

7. The battery steel casing slot shaping fixture according to claim 1, characterized in that, After shaping, the upper flat groove of the slot of the steel shell contacts the plane of the cap.

8. The battery steel casing slot shaping fixture according to claim 1, characterized in that, The depth of the upper flat groove The depth range is: ,in, The depth of the groove in the steel shell.

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