Integrated explosion-proof battery top cover, battery shell and battery monomer
By designing a thinning section and explosion-proof grooves on the battery top cover, and combining this with a closed-loop design for the stamping components, the problem of material wrinkling during the stamping thinning process was solved, achieving high precision and stable explosion-proof performance, and improving the safety and reliability of the battery.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN KEDALI INDUSTRY CO LTD
- Filing Date
- 2025-05-26
- Publication Date
- 2026-06-16
AI Technical Summary
During the stamping and thinning process, the material of the existing integrated explosion-proof battery top cover is prone to wrinkling, which leads to appearance defects and reduced accuracy of explosion-proof markings, affecting explosion stability.
The thinned portion and explosion-proof grooves are formed by integral stamping on the top cover sheet. Combined with the stamping components, they are arranged in a closed loop along the outer periphery of the thinned portion, including protrusions and depressions. Material flow is controlled through multiple stamping processes to avoid wrinkling and cracking.
It improves the appearance yield of the explosion-proof battery top cover and the precision of the explosion-proof structure, ensures the stability of the burst value, and enhances the safety of the battery casing and individual cells.
Smart Images
Figure CN224367061U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to an integrated explosion-proof battery top cover, battery casing and battery cell. Background Technology
[0002] Explosion-proof scoring is the core structure of the safety design of the integrated explosion-proof battery top cover. It forms a local weakened area on the metal top cover through a stamping and thinning process. That is, the required film thickness is reduced through multiple thinning processes to precisely control the burst pressure of the integrated explosion-proof battery top cover.
[0003] However, when the top cover of an existing integrated explosion-proof battery is thinned during stamping, the material around the thinned part is subjected to stress in two directions: tensile stress along the stretching direction of the sheet metal and compressive stress perpendicular to the sheet metal plane (i.e., the thickness direction). When the compressive stress in the thickness direction exceeds the limit that the sheet metal can withstand without plastic deformation, the sheet metal will wrinkle, resulting in appearance defects in the integrated explosion-proof battery top cover. Furthermore, it affects the accuracy of the explosion-proof markings on the integrated explosion-proof battery top cover and reduces its burst stability.
[0004] Therefore, there is an urgent need to propose an integrated explosion-proof battery top cover, battery casing, and battery cell to solve the above problems. Utility Model Content
[0005] The first objective of this utility model is to provide an integrated explosion-proof battery top cover, which has high explosion-proof accuracy and stable burst value; and has a high yield rate when formed by stamping.
[0006] To achieve this objective, the present invention adopts the following technical solution:
[0007] An integrated explosion-proof battery top cover includes:
[0008] A top cover sheet, wherein a thinning portion is provided on the top cover sheet, the thinning portion is integrally stamped by the top cover sheet, and an explosion-proof groove is provided on the surface of the thinning portion away from the battery cell, the thinning portion and the explosion-proof groove form an explosion-proof structure;
[0009] A stamping component, which extends along the outer circumference of the thinned portion and is arranged in a closed loop, is integrally stamped from the top cover sheet, and includes a protrusion on the side of the top cover sheet opposite to the battery cell and a recess on the side of the top cover sheet facing the battery cell.
[0010] Optionally, along the thickness direction of the top cover sheet, the depth dimension of the recess is h1, the distance from the side surface of the thinned portion facing the battery cell to the side surface of the top cover sheet facing the battery cell is h2, and h1>h2.
[0011] Optionally, h1-h2 = 0.32 mm.
[0012] Optionally, the explosion-proof groove extends along the inner circumference of the thinned portion.
[0013] Optionally, the thinned portion has a first groove on the side opposite to the battery cell, and the explosion-proof groove is located at the bottom of the first groove.
[0014] Optionally, the thinned portion has a second groove on the side facing the battery cell, and the second groove is directly opposite the first groove.
[0015] Optionally, both the first groove and the second groove have trapezoidal cross-sectional shapes.
[0016] Optionally, the integrated explosion-proof battery top cover also includes an explosion-proof cover, which is located on the side of the top cover sheet opposite to the battery cell and is mounted on the top cover sheet at the outer peripheral edge of the thinned portion.
[0017] The second objective of this invention is to provide a battery casing with high explosion-proof precision and stable burst value.
[0018] To achieve this objective, the present invention adopts the following technical solution:
[0019] The battery housing includes an outer shell and the aforementioned integrated explosion-proof battery top cover, wherein the top cover is disposed over the opening of the outer shell.
[0020] The third objective of this invention is to provide a battery cell with high safety.
[0021] To achieve this objective, the present invention adopts the following technical solution:
[0022] A battery cell includes a battery cell and a battery casing, wherein the battery cell is located inside the casing, and the top cover and the casing encapsulate the battery cell.
[0023] The beneficial effects of this utility model are:
[0024] This utility model provides an integrated explosion-proof battery top cover comprising a top cover sheet and a stamping component. The thinned portion on the top cover sheet is integrally stamped, and the thinned portion and explosion-proof grooves form an explosion-proof structure. The stamping component extends along the outer circumference of the thinned portion and is arranged in a closed loop. The stamping component is integrally stamped from the top cover sheet, and includes protrusions and recesses. In actual production, when the material plate (the sheet forming the top cover sheet) is thinned through multiple stamping and thinning processes to form the thinned portion, the stamping component can enhance the normal contact force at the wrinkle-prone areas caused by stamping and stretching the material plate. This effectively adjusts and controls the flow resistance of the material around the thinned portion, ensuring that the material flows into the cavity in an appropriate amount, avoiding excessive accumulation and wrinkling of the material around the thinned portion, and insufficient cracking. This improves both the appearance yield of the integrated explosion-proof battery top cover and the accuracy of the explosion-proof structure, as well as the stability of the burst value. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of the integrated explosion-proof battery top cover provided in this embodiment of the utility model;
[0026] Figure 2 This is a first structural schematic diagram of the assembly of the top cover plate and the stamping component provided in this embodiment of the utility model;
[0027] Figure 3 This is a second structural schematic diagram of the assembly of the top cover plate and the stamping component provided in this embodiment of the utility model;
[0028] Figure 4 This is a cross-sectional view of the integrated explosion-proof battery top cover provided in this embodiment of the utility model;
[0029] Figure 5 yes Figure 4 A magnified view of a portion at point A;
[0030] Figure 6 yes Figure 5 A magnified view of the area at point B;
[0031] Figure 7 This is an assembly diagram of the top cover plate and the die before the die closes during the stamping process of the stamping component provided in this utility model embodiment;
[0032] Figure 8 This is an assembly diagram of the material plate and the mold after the mold is closed during the stamping process of the top cover plate and stamping parts provided in this utility model embodiment.
[0033] In the picture:
[0034] 10. Stamping machine base; 20. Upper die holder; 21. Annular rib groove; 30. Lower die holder; 31. Annular rib; 32. Boss;
[0035] 100. Top cover sheet; 110. Thinned portion; 111. First groove; 112. Second groove; 120. Explosion-proof groove; 200. Stamped part; 210. Protrusion; 220. Recess; 300. Explosion-proof cover; 510. Positive electrode assembly; 520. Negative electrode assembly; 600. Lower plastic. Detailed Implementation
[0036] 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 present 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, not the entire structure.
[0037] In the description of this utility model, 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 utility model based on the specific circumstances.
[0038] 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.
[0039] 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 this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.
[0040] This embodiment provides an integrated explosion-proof battery top cover, which has high explosion-proof accuracy and stable burst value; and the stamping yield is high.
[0041] Specifically, such as Figures 1 to 6As shown, the integrated explosion-proof battery top cover includes a top cover sheet 100 and a stamping component 200. The top cover sheet 100 has a thinning portion 110, which is integrally stamped from the top cover sheet 100. Specifically, the thinning portion 110 is formed by multiple stamping, stretching, and thinning processes on a stamping machine 10. Explosion-proof markings 120 are provided on the surface of the thinning portion 110 facing away from the battery cell. The explosion-proof markings 120 can be mechanical stamping markings, laser markings, or chemical etching, etc. The thinning portion 110 and the explosion-proof markings 120 form an explosion-proof structure. The stamping component 200 extends along the outer circumference of the thinning portion 110 and is arranged in a closed loop. The stamping component 200 is integrally stamped from the top cover sheet 100, and includes a protrusion 210 on the side of the top cover sheet 100 facing away from the battery cell and a recess 220 on the side of the top cover sheet 100 facing the battery cell.
[0042] It should be noted that both the stamping thinning process and the scoring process are relatively mature existing technologies in this field, and will not be described in detail here.
[0043] Based on the above design, the thinned portion 110 on the top cover 100 is integrally stamped from the top cover 100, and the thinned portion 110 and the explosion-proof groove 120 form an explosion-proof structure. The stamping component 200 extends along the outer periphery of the thinned portion 110 and is arranged in a closed loop. The stamping component 200 is integrally stamped from the top cover 100, and the stamping component 200 includes a protrusion 210 and a recess 220, which are respectively arranged around the thinned portion 110 on both sides of the top cover 100 in the thickness direction. In actual production, when the material plate (the plate forming the top cover 100) is thinned into the thinned portion 110 through multiple stamping and thinning processes, the stamping component 200 can enhance the normal contact force at the wrinkle-prone area caused by stamping and stretching the material plate. This effectively adjusts and controls the flow resistance of the material around the thinned portion 110, ensuring that the material flows into the cavity in an appropriate amount. This avoids excessive accumulation and wrinkling of the material around the thinned portion 110, as well as insufficient cracking. This not only improves the appearance yield of the integrated explosion-proof battery top cover, but also improves the precision of the explosion-proof structure and stabilizes the burst value.
[0044] Optionally, the integrated explosion-proof battery top cover can be first stamped to form the stamped part 200, and then stamped multiple times to form the thinned part 110; or the stamping thinning process can be carried out at the same time as stamping to form the stamped part 200.
[0045] When the stamping process is performed simultaneously with the forming of the stamped part 200, the depth dimension of the recess 220 along the thickness direction of the top cover plate 100 is h1, and the distance from the surface of the thinned portion 110 facing the battery cell to the surface of the top cover plate 100 facing the battery cell is h2, where h1 > h2. Specifically, in actual stamping, as... Figure 7 and Figure 8As shown, the mold is installed on the stamping machine base 10. The mold includes an upper mold base 20 and a lower mold base 30. The upper mold base 20 is provided with an annular groove 21, and the lower mold base 30 is provided with an annular rib 31. The annular rib 31 and the annular groove 21 form a drawbead structure. A boss 32 is provided inside the annulus of the annular rib 31. The height of the annular rib 31 is h1, and the height of the boss 32 is h2, where h1>h2. The material plate is placed between the upper mold base 20 and the lower mold base 30. The upper mold base 20 and the lower mold base 30 function on the stamping machine base 10. The lower die presses the blank plate. The pressing part corresponding to the annular rib 31 on the blank plate forms the initial pressure, which is the material flow resistance, before the pressing part corresponding to the boss 32. As the material continues to press downward, it overcomes the pressing force and flows into the die cavity until the die is pressed to the bottom. The surfaces of the lower die holder 30 (punch) and the upper die holder 20 (die) simultaneously come into full contact with the upper and lower surfaces of the blank plate. The blank plate is drawn and formed simultaneously to form the stamped part 200 and the thinned part 110. The thinned part 110 then forms an explosion-proof structure through other processes.
[0046] In this embodiment, h1-h2=0.32mm.
[0047] Optionally, the explosion-proof notch 120 extends along the inner circumference of the thinned portion 110, increasing the circumference of the explosion-proof notch 120 to facilitate the explosion-proof structure from being blown up.
[0048] It should be noted that the explosion-proof groove 120 extends continuously along the inner circumference of the thinned portion 110, but the beginning and end of the explosion-proof groove 120 are not connected, and there is a gap between the beginning and end, to ensure the strength of the thinned portion 110 and to prevent the thinned portion 110 from falling into the battery cell after an explosion.
[0049] In this embodiment, the explosion-proof notch 120 is similar to a racetrack shape; the cross-section of the explosion-proof notch 120 is trapezoidal.
[0050] Furthermore, the thinned portion 110 has a first groove 111 on the side away from the battery cell, and the explosion-proof groove 120 is located at the bottom of the first groove 111, further reducing the thickness of the part where the explosion-proof groove 120 is located, which facilitates the explosion-proof structure from being destroyed.
[0051] Furthermore, a second groove 112 is provided on the side of the thinned portion 110 facing the battery cell. The second groove 112 is directly opposite to the first groove 111, further reducing the thickness of the area where the explosion-proof marking 120 is located, thus facilitating the explosion-proof structure from being destroyed.
[0052] The cross-sectional shape of the first groove 111 and the second groove 112 is trapezoidal, but it can also be triangular or square, etc.
[0053] Optionally, the integrated explosion-proof battery top cover also includes an explosion-proof cover 300, which is located on the side of the top cover plate 100 away from the battery cell and is placed on the top cover plate 100 at the outer periphery of the thinned portion 110 to prevent debris from falling into the explosion-proof grooves 120 and improve the safety of the battery cell.
[0054] It should be noted that the integrated explosion-proof battery top cover also includes a positive terminal assembly 510, a negative terminal assembly 520, and a lower plastic 600. The positive terminal assembly 510 and the negative terminal assembly 520 are located on opposite sides of the explosion-proof structure along the length of the top cover 100, respectively, while the lower plastic 600 abuts against the side of the top cover 100 facing the battery cell. The installation methods of the positive terminal assembly 510, the negative terminal assembly 520, and the lower plastic 600 are all mature existing technologies in the field and will not be described in detail here.
[0055] This embodiment also provides a battery casing with high explosion-proof accuracy and stable burst value.
[0056] Specifically, the battery casing includes an outer shell and the aforementioned integrated explosion-proof battery top cover, with the top cover 100 covering the opening of the outer shell. The top cover 100 has a thinning portion 110, which is integrally stamped from the top cover 100. Explosion-proof grooves 120 are provided on the surface of the thinning portion 110 facing away from the battery cell, and the thinning portion 110 and the explosion-proof grooves 120 form an explosion-proof structure. The stamping component 200 extends along the outer periphery of the thinning portion 110 and is arranged in a closed loop. The stamping component 200 is integrally stamped from the top cover 100, and includes a protrusion 210 on the side of the top cover 100 facing away from the battery cell and a recess 220 on the side of the top cover 100 facing the battery cell. In actual production, when the material plate (the plate forming the top cover 100) is thinned into the thinned portion 110 through multiple stamping and thinning processes, the stamping component 200 can enhance the normal contact force at the wrinkle-prone area caused by stamping and stretching the material plate. This effectively adjusts and controls the flow resistance of the material around the thinned portion 110, ensuring that the material flows into the cavity in an appropriate amount. This avoids excessive accumulation and wrinkling of the material around the thinned portion 110, as well as insufficient cracking. This improves the accuracy of the explosion-proof structure on the battery casing and stabilizes the burst value.
[0057] This embodiment also provides a battery cell with a high-precision explosion-proof structure and stable burst value.
[0058] Specifically, the battery cell includes a battery cell and the aforementioned battery casing. The battery cell is located inside the casing, and the top cover 100 and the casing encapsulate the battery cell. The explosion-proof structure on the battery casing has high precision and stable burst value, thereby improving the safety of the battery cell.
[0059] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. 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 this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. An integrated explosion-proof battery top cover, characterized in that, include: A top cover sheet (100) is provided with a thinning portion (110), the thinning portion (110) is integrally stamped from the top cover sheet (100), and an explosion-proof groove (120) is provided on the side surface of the thinning portion (110) away from the battery cell, the thinning portion (110) and the explosion-proof groove (120) form an explosion-proof structure; A stamping component (200) extends along the outer periphery of the thinned portion (110) and is arranged in a closed loop. The stamping component (200) is integrally stamped from the top cover plate (100) and includes a protrusion (210) on the side of the top cover plate (100) away from the battery cell and a recess (220) on the side of the top cover plate (100) facing the battery cell.
2. The integrated explosion-proof battery top cover according to claim 1, characterized in that, Along the thickness direction of the top cover (100), the depth dimension of the recess (220) is h1, the distance from the side surface of the thinned portion (110) facing the cell to the side surface of the top cover (100) facing the cell is h2, and h1>h2.
3. The integrated explosion-proof battery top cover according to claim 2, characterized in that, h1-h2=0.32mm.
4. The integrated explosion-proof battery top cover according to claim 1, characterized in that, The explosion-proof groove (120) extends along the inner circumference of the thinned portion (110).
5. The integrated explosion-proof battery top cover according to claim 4, characterized in that, The thinned portion (110) has a first groove (111) on the side opposite to the battery cell, and the explosion-proof groove (120) is located at the bottom of the first groove (111).
6. The integrated explosion-proof battery top cover according to claim 5, characterized in that, The thinned portion (110) has a second groove (112) on the side facing the battery cell, and the second groove (112) is directly opposite to the first groove (111).
7. The integrated explosion-proof battery top cover according to claim 6, characterized in that, The cross-sectional shape of the first groove (111) and the second groove (112) is trapezoidal.
8. The integrated explosion-proof battery top cover according to claim 1, characterized in that, The integrated explosion-proof battery top cover also includes an explosion-proof cover (300), which is located on the side of the top cover piece (100) away from the battery cell and is mounted on the top cover piece (100) on the outer peripheral edge of the thinned portion (110).
9. A battery casing, characterized in that, The battery includes an outer casing and an integrated explosion-proof battery top cover as described in any one of claims 1-8, wherein the top cover sheet (100) covers the opening of the outer casing.
10. A single battery cell, characterized in that, The battery includes a battery cell and a battery housing as described in claim 9, wherein the battery cell is located within the housing, and the top cover (100) and the housing encapsulate the battery cell.