Explosion-proof steel shell assembly

Abstract

The utility model discloses an explosion-proof steel shell assembly, which comprises a shell with at least one open end and a cover plate for blocking the open end of the shell, an explosion-proof nick is formed on the surface of the cover plate or the surface of the shell, and the residual thickness of the explosion-proof nick is gradually increased or decreased from one end of the explosion-proof nick to the other opposite end of the explosion-proof nick. The explosion-proof valve and the cover plate are integrally punched and formed, the explosion-proof valve does not need to be assembled and welded, the process steps are reduced, the production process is simplified, the production efficiency and the yield are improved, the thickness of the cover plate is greatly reduced, the cover plate is easier to punch and form, and the stability of burst pressure relief is improved due to the fact that the residual thickness of the explosion-proof nick is gradually changed.

Description

TECHNICAL FIELD

[0001] The utility model relates to power battery technical field, in particular to a kind of explosion-proof steel shell assembly. BACKGROUND

[0002] Stainless steel shell is by stainless steel material welding into the square shell of two ends opening, stainless steel bottom cover plate is welded in one end port part, to form the shell of secondary battery, the battery in the sealed shell may generate high-temperature and high-pressure gas to cause shell explosion in use process, to prevent shell explosion, high-temperature and high-pressure gas generated in the shell needs to be pressure-relieved explosion-proof, the conventional method is to stamp or adopt CNC to process the explosion-proof counterbore of installing explosion-proof valve on the bottom cover plate of shell, then explosion-proof valve sheet is welded on explosion-proof counterbore, more procedures;At the same time, to guarantee the strength of bottom cover plate and facilitate explosion-proof valve sheet to be welded at explosion-proof counterbore smoothly, the thickness of this cover plate needs to be relatively thick, usually about 1.5mm, since the hardness of stainless steel is as high as 150~180HV, stamping upsetting forming process is difficult, the thicker the thickness of cover plate, the more difficult to stamp, also can greatly shorten the stamping life of die, and in actual stamping, each step is connected and forms arc transition, cannot clear angle, subsequent installation explosion-proof valve sheet is prone to interference, explosion-proof valve sheet is difficult to install, and welding yield is low;And the step of explosion-proof counterbore is milled by CNC, cost is higher, production efficiency is slow, not suitable for mass production. SUMMARY

[0003] Therefore, the utility model discloses a kind of explosion-proof steel shell assembly, to solve the problems of multiple procedures, thick material, assembly and welding difficulties, welding yield bottom in the manufacture of explosion-proof steel shell in prior art.

[0004] To achieve the above-mentioned purpose, the utility model of a kind of explosion-proof steel shell assembly, including at least one open shell and the cover plate of the open end of the shell, the surface of the cover plate or the surface of the shell is formed with explosion-proof notch, the residual thickness of the explosion-proof notch gradually increases or decreases from one end of explosion-proof notch to the opposite end, the periphery of the cover plate is formed with the flanging structure compatible with the inner wall of the shell.

[0005] In the above scheme, the explosion-proof notch can be directly formed on the surface of the cover plate or the shell by punching or milling, without the need to process an explosion-proof counterbore on the cover plate and then weld an explosion-proof sheet on the explosion-proof counterbore, thus the process is simple, and since the explosion-proof sheet does not need to be welded, the thickness of the cover plate can be greatly reduced, making the cover plate easier to cut and punch into shape. When the pressure inside the shell increases to a set value, the explosion-proof notch on the cover plate or the shell cracks to release pressure, achieving the purpose of effective explosion-proof. The residual thickness of the explosion-proof notch gradually changes, so that each time the explosion relief occurs, it starts to crack at the position with the smallest residual thickness of the explosion-proof notch. In the case where the residual thickness of the explosion-proof notch is equal, the position where the explosion-proof notch starts to crack each time the explosion relief occurs cannot be predicted. In comparison, the explosion stability and controllability of the present scheme are stronger.

[0006] Further, the residual thickness of the thinner end of the explosion-proof notch is 0.07mm-0.09mm, and the residual thickness of the thicker end of the explosion-proof notch is 0.12mm-0.14mm.

[0007] Further, the cover plate is integrally punched from a stainless steel plate with a thickness of 0.15mm-0.35mm, the shell is made by bending and welding a stainless steel plate with a thickness of 0.15mm-0.25mm, and the cover plate is fixedly welded to the shell.

[0008] Further, the flange structure includes a downward flange formed along the four peripheral edges of the cover plate, the outer wall of the flange is matched with the inner wall of the shell, the height of the flange is 0.5mm-0.7mm, preferably 0.6mm (the height of the flange is defined as the distance from the upper surface of the cover plate to the lower end surface of the flange), and the upper surface of the cover plate is higher than the upper end surface of the shell by 0.2mm-0.4mm, preferably 0.3mm, so as to form a welding step between the upper end surface of the shell and the upper surface of the cover plate.

[0009] Further, the flange structure includes an open upward U-shaped flange formed along the four peripheral edges of the cover plate, the outer wall of the U-shaped flange is matched with the inner wall of the shell, the height of the U-shaped flange is 0.6mm-1.0mm, preferably 0.8mm (the height of the U-shaped flange is defined as the distance from the upper surface of the cover plate to the lower end surface of the U-shaped flange), and the upper end surface of the U-shaped flange is higher than the upper end surface of the shell by 0.15mm-0.4mm, preferably 0.2mm, so as to form a welding step between the upper end surface of the shell and the upper surface of the cover plate.

[0010] Further, the flanging structure comprises a U-shaped flange formed along the opening upwardly along the four periphery edges of the cover plate, the outer wall of the U-shaped flange is matched with the inner wall of the shell, the height of the U-shaped flange is 0.6mm-1.0mm, preferably 0.8mm, the upper end surface of the U-shaped flange is flush with the upper end surface of the shell.

[0011] Further, the flanging structure comprises a U-shaped flange formed along the opening upwardly along the four periphery edges of the cover plate, the outer wall of the U-shaped flange is matched with the inner wall of the shell, the height of the U-shaped flange is 0.6mm-1.0mm, U-shaped flange upper end surface is provided with a flange formed along the horizontal direction, the lower surface of the flange is matched with the upper end surface of the shell, and the outer periphery of the flange is flush with the outer wall of the shell.

[0012] Further, the projection of the explosion-proof notch on the surface of the cover plate or the surface of the shell is in the shape of an ellipse, a circle, a square or a polygon.

[0013] Further, the explosion-proof notch is arranged on the upper surface or the lower surface of the cover plate; or

[0014] The explosion-proof notch is arranged on the outer wall or the inner wall of the shell.

[0015] Further, the cross section of the explosion-proof notch is a U-shaped groove, a V-shaped groove or an inverted trapezoidal groove.

[0016] The explosion-proof valve is formed on the surface of the cover plate or the surface of the shell by the integrated stamping mode, the explosion-proof sheet does not need to be assembled and welded, the process steps are reduced, the production process is simplified, the production efficiency and the yield are improved, the thickness of the cover plate is greatly reduced, the cover plate is more easily stamped, the residual thickness of the explosion-proof notch for pressure relief is a gradient structure, the stability and controllability of the explosion are improved, the flanging structure is arranged on the edge of the cover plate, the edge of the cover plate has a certain elasticity, the assembly and welding of the cover plate and the shell are facilitated, and the welding is more firm. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is an exploded view of the explosion-proof steel shell assembly.

[0018] Figure 2 It is a top view of the explosion-proof steel shell assembly.

[0019] Figure 3 It is Figure 2 A-A sectional view.

[0020] Figure 4 It is Figure 3 A enlarged view of A part.

[0021] Figure 5 For Figure 3 Enlarged view of B part in

[0022] Figure 6 For A part in Figure 3 of Example Two is enlarged.

[0023] Figure 7 For A part in Figure 3 of Example Three is enlarged.

[0024] Figure 8 For A part in Figure 3 of Example Four is enlarged.

[0025] Figure 9 For the structure diagram of the stamping head for pressing and engraving the anti-explosion engraving in the utility model.

[0026] The description of the drawings is as follows:

[0027] The shell - 10;

[0028] The cover plate - 20; The anti-explosion engraving - 201; The flange - 202; The welding step - 203a, 203b; The molten pool - 204a, 204b, 204c, 204d; The flange - 205a; The U-shaped flange - 205b, 205c, 205d;

[0029] The stamping head - 30; The convex part - 301. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present application more clear, the technical scheme of the present application will be described clearly and completely in combination with the specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein only for the purpose of describing specific embodiments, not intended to limit the present application.

[0032] Example One

[0033] The present embodiment discloses an anti-explosion steel shell assembly, as shown in Figures 1-5As shown, the shell 10 includes at least one open end and a cover plate 20 sealing the open end of the shell 10, and the surface of the cover plate 20 or the surface of the shell 10 is formed with an explosion-proof notch 210, the residual thickness of the explosion-proof notch 201 gradually increases or decreases from one end to the opposite end, and the periphery of the cover plate is formed with a flange structure matching the inner wall of the shell.

[0034] The shell 10 in the embodiment is a cylindrical body with both upper and lower ends open, and the cover plate 20 is arranged on one open end of the shell 10 to seal the open end. In this arrangement, after the shell 10 is installed with the battery cell and the other open end is sealed with the electrode plate, a power battery or battery pack is formed. Understandably, the shell 10 can also be closed at one end and open at the other end, and the cover plate 20 is arranged on the open end to seal the open end. The shell 10 in the embodiment is made of stainless steel sheet with a thickness of 0.15mm-0.25mm by cutting-bending-welding, and preferably made of stainless steel sheet with a thickness of 0.2mm. In combination with Figure 1 、 Figure 2 As shown, the shell 10 in the embodiment is a thin-walled cylindrical body with both upper and lower ends open, which includes two oppositely arranged wide side walls and two oppositely arranged narrow side walls, and the cover plate 20 is a rectangular plate body matching the opening of the rectangular cylindrical shell 10. Understandably, in other feasible embodiments, the shell 10 can also be a square or other shape thin-walled cylindrical body, and correspondingly, the shape of the cover plate 20 matches the shape of the open end of the shell 10. After the shell 10 is made, the cover plate 20 is fixedly connected with the shell 10 by welding. After being fixedly connected with the shell 10, the cover plate 20 seals the open end of the shell 10. In the embodiment, the shell 10 is vertically placed, and the cover plate 20 is arranged on the upper open end of the shell 10.

[0035] As shown in Figure 2 , the cover plate 20 is a rectangular plate body, and the position of the explosion-proof notch 201 on the surface of the cover plate 20 can be determined according to the assembly inside the shell 10 and can be arranged at any desired position on the cover plate 20. In the embodiment, the explosion-proof notch 201 is arranged at the middle position of the cover plate 20, and as shown in Figures 2-5 , the explosion-proof notch 201 is formed by stamping, and the projection of the track of the explosion-proof notch 201 on the surface of the cover plate 20 can be arranged as an elliptical, circular, square or other shape closed curve, as shown in Figure 1 、 Figure 2 , the track of the explosion-proof notch 201 in the embodiment is arranged as an elliptical curve along the length direction of the cover plate 20, and as shown in Figures 3-5 , the residual thickness of the explosion-proof notch 201 is 0.07mm-0.14mm, and as shown in Figure 5As shown, the residual thickness of the explosion-proof notch 201 is defined as the remaining thickness H of the cover plate 20 after the cover plate 20 is punched to be concave at the explosion-proof notch 201, the explosion-proof notch 201 is only formed by the surface of the cover plate 20 being concave to the inside of the body of the cover plate 20, and the opposite surface of the cover plate 20 remains flat and does not produce a protruding feature corresponding to the explosion-proof notch 201, and the cross section of the explosion-proof notch 201 can be a U-shaped groove, a V-shaped groove, or an inverted trapezoidal groove, etc., as shown in Figure 4 , Figure 5 As shown, in this embodiment, the explosion-proof notch 201 is preferably an inverted trapezoidal groove, thereby forming an explosion-proof valve at the explosion-proof notch 201 for relieving the pressure in the inner cavity of the shell 10. Since the explosion-proof valve is formed by punching in an integrated manner with the cover plate 20, it is not necessary to separately assemble and weld the explosion-proof sheet, and therefore the cover plate 20 does not need to have a relatively thick thickness to consider the feasibility of assembling and welding with the explosion-proof sheet. In general design, this kind of welding of the explosion-proof sheet usually requires the thickness of the cover plate 20 to be greater than 1.5 mm to enable good welding of the separate explosion-proof sheet to the cover plate 20. Furthermore, since it is not necessary to weld the explosion-proof sheet on the cover plate 20, the cover plate 20 formed by punching in an integrated manner in this solution can be punched from a relatively thin sheet or plate material, and can be integrally punched from a stainless steel plate material or sheet material with a thickness of 0.15 mm to 0.35 mm, such as 0.15 mm, 0.2 mm, 0.25 mm, or 0.35 mm. The cover plate 20 in this solution is preferably made of a 0.2 mm thick stainless steel sheet or plate material. Therefore, due to the relatively thin thickness, the cover plate 20 formed in an integrated manner with the explosion-proof valve is easier to punch, the process is simpler, the production efficiency is higher, and the yield is higher. In this way, since the residual thickness at the explosion-proof notch 201 is smaller than the thickness of the cover plate 20 at other positions of the cover plate 20, when the pressure of the high-pressure gas generated in the shell 10 which is closed at both ends reaches a preset value, the explosion-proof notch 201 on the surface of the cover plate 20 will first crack to relieve the pressure, preventing the gas pressure in the shell 10 from continuously rising to cause a more intense explosion of the entire shell 10, thereby achieving the purpose of pressure relief and explosion prevention. In this embodiment, the explosion-proof notch 201 is provided on the upper surface of the cover plate 20, and a protective film needs to be pasted on the upper surface of the cover plate 20 to protect the explosion-proof notch 201 from being corroded by other corrosive liquids entering the explosion-proof notch 201. In other feasible embodiments, the explosion-proof notch 201 can be provided on the lower surface of the cover plate 20, and the explosion-proof notch 201 provided on the lower surface of the cover plate 20 can keep the upper surface of the cover plate 20 flat and beautiful, and does not need to be protected by a protective film. In combination with Figures 3 to 5 As shown, the residual thickness of the explosion-proof notch 201 gradually increases or decreases from one end of the cover plate 20 to the opposite end, please refer to Figure 9 ,Figure 9is a schematic view of a die for the stamping head 30 used to stamp the explosion-proof score 201 on the surface of the cover plate 20, in which the protruding height of the protruding part 301 used to stamp the explosion-proof score 201 gradually decreases or increases from one end of the stamping head 30 to the opposite end of the stamping head 30, so that the residual thickness of the explosion-proof score 201 stamped on the surface of the cover plate 20 by the stamping head 30 gradually increases or decreases from one end of the cover plate 20 to the opposite end of the cover plate 20, in the embodiment, the residual thickness of the explosion-proof score 201 gradually increases or decreases along the length direction of the cover plate 20, it can be understood that in other feasible embodiments, the residual thickness of the explosion-proof score 201 can also gradually increase or decrease along the width direction of the cover plate 20. In the embodiment, the residual thickness of the thinner end of the explosion-proof score 201 can be set to 0.07mm-0.09mm, and the residual thickness of the thicker end of the explosion-proof score 201 can be set to 0.12mm-0.14mm, preferably, when the thickness of the cover plate 20 is 0.2mm, the residual thickness of the thinner end of the explosion-proof score 201 is set to 0.08mm, and the residual thickness of the thicker end of the explosion-proof score 201 is set to 0.13mm, it can be understood that when the thickness of the cover plate 20 decreases, the residual thickness of the thinner end and the residual thickness of the thicker end of the explosion-proof score 201 can be appropriately reduced, and when the thickness of the cover plate 20 increases, the residual thickness of the thinner end and the residual thickness of the thicker end of the explosion-proof score 201 can be appropriately increased, or the residual thickness of the thinner end and the residual thickness of the thicker end can be determined according to the parameters of the battery cell in the shell 10 and the use environment. In this way, since the residual thickness of the explosion-proof score 201 gradually changes, when high pressure is generated inside the shell 10, the explosion-proof score 201 starts to crack at the position with the smallest residual thickness each time the explosion pressure relief occurs, and then gradually extends to the thicker end of the explosion-proof score 201, and the explosion pressure relief is more stable, while in the case where the residual thickness of the explosion-proof score 201 is set to be equal without change, when the explosion pressure relief occurs in the shell 10, the place where the explosion-proof score 201 starts to crack is unpredictable, or the phenomenon that the entire explosion-proof score 201 synchronously explodes and makes the cover plate 20 body splash and separate from the shell 10 may occur, in comparison, the setting of the variable residual thickness of the explosion-proof score 201 in the present scheme makes the explosion stability and controllability stronger.It can be understood that, in the case that the residual thickness of the explosion-proof notch 201 is gradually changed, the projection of the track of the explosion-proof notch 201 on the surface of the cover plate can also be an open curve. In this case, the residual thickness of the thicker end of the explosion-proof notch 201 is equal to the thickness of the cover plate 20. In this arrangement, when high pressure is generated inside the shell 10, the explosion relief occurs at the position with the minimum residual thickness of the explosion-proof notch 201 each time, and then gradually extends to the thicker end of the explosion-proof notch 201. Since the thickness of the thicker end of the explosion-proof notch 201 is the same as the thickness of the cover plate 20, the thickness of the thicker end of the residual thickness of the explosion-proof notch 201 is thicker than that of the explosion-proof notch 201 with a closed track. Therefore, the phenomenon that the entire explosion-proof notch 201 is completely cracked when the shell 10 is subjected to explosion relief does not occur, which effectively avoids the situation that the cover plate 20 body is splashed away from the cover plate 20 and damages other components when the shell 10 is subjected to explosion relief.

[0036] It can be understood that the explosion-proof notch 201 can also be arranged on the surface of the shell 10, such as on the outer wall of the shell 10 or on the inner wall of the shell 10. When the explosion-proof notch 201 is arranged on the surface of the shell 10, the projection of the track of the explosion-proof notch 201 on the surface of the shell 10 can also be arranged as an ellipse, a circle, a square, or other shapes of closed or open curves. The residual thickness of the explosion-proof notch 201 is defined as the thickness of the side wall of the shell 10 after the side wall is punched and recessed at the explosion-proof notch 201.

[0037] In this embodiment, a steel pressing plate can also be arranged below the cover plate 20 to strengthen the strength of the cover plate 20 and improve the deformation resistance of the cover plate 20. The steel pressing plate can be attached to the lower surface of the cover plate 20. The length and width dimensions of the steel pressing plate are correspondingly smaller than the length and width dimensions of the cover plate 20. A through hole 2042 is arranged in the middle of the steel pressing plate to cooperate with the explosion-proof notch 201, so that the pressure generated in the shell 10 can directly act on the explosion-proof notch 201 of the cover plate 20. With the strengthening effect of the steel pressing plate, the thickness of the cover plate 20 can be as thin as possible under the condition of meeting the required use strength of the cover plate 20, which can be 0.15 mm. This makes the punching forming of the cover plate 20 easier and the yield rate higher.

[0038] In combination Figure 3 , Figure 4As shown, in the embodiment, the flanging structure comprises a downward flange 205a formed along the four perimeters of the cover plate 20, the outer wall of the flange 205a is matched with the inner wall of the shell 10, in the case that a steel pressing plate is attached to the lower surface of the cover plate 20, the height of the flange 205a is less than the thickness of the steel pressing plate after being stacked with the cover plate 20 (the height of the flange 205a is defined as the distance from the upper surface of the cover plate 20 to the lower end surface of the flange 205a), in this way, the lower end of the flange 205a does not downwardly exceed the lower surface of the steel pressing plate below the cover plate 20, and does not interfere with the components such as the battery cell installed in the shell 10, in the embodiment, the height of the flange 205a is 0.5mm-0.7mm, preferably 0.6mm, due to the setting of the flange 205a, the edge of the cover plate 20 has a certain elasticity, when the outer wall of the flange 205a is matched with the inner wall of the shell 10 to cover the cover plate 20 on the upper port of the shell 10, the cover plate 20 is more easily assembled on the upper port of the shell 10, in the embodiment, when the cover plate 20 is assembled on the upper port of the shell 10 to close the upper port of the shell 10, the upper surface of the cover plate 20 is higher than the upper end surface of the shell 10 by 0.15mm-0.4mm, such as 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm or 0.4mm, preferably, the upper surface of the cover plate 20 is higher than the upper end surface of the shell 10 by 0.3mm, so that the upper surface of the cover plate 20 and the upper end surface of the shell 10 form a welding step 203a which is beneficial for welding the cover plate 20 and the shell 10 together, in this way, when the cover plate 20 and the shell 10 are fusion welded together at the welding step 203a by using laser welding, the molten pool 204a is formed at the welding step 203a to fill the welding step 203a, in the blowing state of the protective gas during welding, the molten pool 204a is full in shape, naturally forming a round corner state, and the welding effect is better.

[0039] Embodiment Two

[0040] Combined Figure 3 , Figure 6As shown, in the present embodiment, the flanging structure comprises a U-shaped flange 205b formed along the opening along the four perimeters of the cover plate 20, the outer wall of the U-shaped flange 205b is matched with the inner wall of the shell 10, in the case that a steel pressing plate is attached to the lower surface of the cover plate 20, the lower end surface of the U-shaped flange 205b is located in the space above the plane where the lower surface of the steel pressing plate is located, or the lower end surface of the U-shaped flange 205b is flush with the lower surface of the steel pressing plate, in this way, the lower end of the U-shaped flange 205b will not downwardly exceed the lower surface of the steel pressing plate below the cover plate 20, and will not interfere with the components such as the battery cell installed in the shell 10, the upper end surface of the U-shaped flange 205b is flush with the upper end surface of the cover plate 20 or is located in the space below the plane where the upper end surface of the cover plate 20 is located, preferably, the upper end surface of the U-shaped flange 205b is located in the space below the plane where the upper end surface of the cover plate 20 is located, due to the arrangement of the U-shaped flange 205b, the periphery of the cover plate 20 has a certain elasticity, when the outer wall of the U-shaped flange 205b is matched with the inner wall of the shell 10 to cover the cover plate 20 on the upper end port of the shell 10, the cover plate 20 is more easily assembled on the upper end port of the shell 10, in the present embodiment, the height of the U-shaped flange is 0.6mm-1.0mm (the height of the U-shaped flange 205b is defined as the distance from the upper surface of the cover plate 20 to the lower end surface of the U-shaped flange 205b), preferably 0.8mm, when the cover plate 20 is assembled on the upper end port of the shell 10, the shell depth of the U-shaped flange 205b is 0.25mm-0.45mm (the shell depth of the U-shaped flange 205b is defined as the distance between the lower end surface of the U-shaped flange 205b and the upper end surface of the shell 10), preferably, the shell depth of the U-shaped flange 205b is 0.3mm, of course, the shell depth of the U-shaped flange 205b can be reasonably adjusted according to the specifications of the product. In the present embodiment, when the cover plate 20 is assembled on the upper end port of the shell 10 to close the upper end port of the shell 10, the upper end surface of the U-shaped flange 205b is 0.15mm-0.4mm higher than the upper end surface of the shell 10, such as 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm or 0.4mm, preferably, the upper end surface of the U-shaped flange 205b is 0.2mm higher than the upper end surface of the shell 10, so that the upper surface of the cover plate 20 and the upper end surface of the shell 10 form a welding step 203b which is beneficial for welding the cover plate 20 and the shell 10 together, in this way, when the cover plate 20 and the shell 10 are fusion welded together at the welding step 230b by laser welding, the molten pool 204b is formed at the welding step 203b to fill the welding step 203b, in the blowing state of the protective gas during welding, the molten pool 204b is full in shape, naturally forming a round corner state, and the welding effect is better.

[0041] Embodiment Three

[0042] In combination Figure 3 ,Figure 7 As shown in the embodiment, the flange structure includes a U-shaped flange 205c formed along the opening of the four edges of the cover plate 20, the outer wall of the U-shaped flange 205c is matched with the inner wall of the shell 10, and in the case where a steel pressing plate is attached to the lower surface of the cover plate 20, the lower end surface of the U-shaped flange 205c is located in the space above the plane where the lower surface of the steel pressing plate is located, or the lower end surface of the U-shaped flange 205c is flush with the lower surface of the steel pressing plate, so that the lower end of the U-shaped flange 205c does not protrude downward beyond the lower surface of the steel pressing plate below the cover plate 20, and does not interfere with the components such as the battery cell installed in the shell 10, and the upper end surface of the U-shaped flange 205c is flush with the upper end surface of the cover plate 20 or is located in the space below the plane where the upper end surface of the cover plate 20 is located, preferably, the upper end surface of the U-shaped flange 205c is located in the space below the plane where the upper end surface of the cover plate 20 is located, and the height of the U-shaped flange is 0.6mm-1.0mm (the height of the U-shaped flange 205c is defined as the distance from the upper surface of the cover plate 20 to the lower end surface of the U-shaped flange 205c), preferably 0.8mm. Due to the provision of the U-shaped flange 205c, the edge of the cover plate 20 has a certain elasticity, and when the outer wall of the U-shaped flange 205c is matched with the inner wall of the shell 10 to cover the cover plate 20 on the upper port of the shell 10, the cover plate 20 is more easily assembled on the upper port of the shell 10. In the present embodiment, when the cover plate 20 is assembled on the upper port of the shell 10 to close the upper port of the shell 10, the upper end surface of the U-shaped flange 205c is flush with the upper end surface of the shell 10, and when laser welding is used, the molten pool 204c is formed at the gap between the upper end surface of the shell 10 and the upper end surface of the U-shaped flange 205c.

[0043] Example Four

[0044] In combination Figure 3 , Figure 8As shown, in the present embodiment, the turn-up structure comprises a U-shaped turn-up 205d formed along the opening along the four perimeters of the cover plate 20, the outer wall of the U-shaped turn-up 205d is matched with the inner wall of the shell 10, in the case that a steel pressing plate is attached to the lower surface of the cover plate 20, the lower end surface of the U-shaped turn-up 205d is located in the space above the plane where the lower surface of the steel pressing plate is located, or the lower end surface of the U-shaped turn-up 205d is flush with the lower surface of the steel pressing plate, in this way, the lower end of the U-shaped turn-up 205d does not downwardly exceed the lower surface of the steel pressing plate below the cover plate 20, and does not interfere with the components such as the battery cell installed in the shell 10, the upper end surface of the U-shaped turn-up 205d is flush with the upper end surface of the cover plate 20 or is located in the space below the plane where the upper end surface of the cover plate 20 is located, preferably, the upper end surface of the U-shaped turn-up 205d is located in the space below the plane where the upper end surface of the cover plate 20 is located, the height of the U-shaped turn-up 205d is 0.6mm-1.0mm (the height of the U-shaped turn-up 205d is defined as the distance from the upper surface of the cover plate 20 to the lower end surface of the U-shaped turn-up 205d), preferably 0.8mm, the upper end surface of the U-shaped turn-up 205d extends in the horizontal direction to form a flange 202, in the present embodiment, when the cover plate 20 is assembled to the upper end port of the shell 10 to close the upper end port of the shell 10, the lower surface of the flange 202 is attached to the upper end surface of the shell 10, and the outer periphery of the flange 202 is flush with the outer wall of the shell 10. When laser welding is adopted, the gap between the shell 10 and the flange 202 is welded, and the molten pool 204d is formed at the gap between the upper end outer wall of the shell 10 and the outer periphery of the flange 202.

[0045] The present utility model discloses a cover plate and a shell are integrally formed by stamping, and the cover plate is provided with a turn-up structure, so that the cover plate is easy to be assembled and welded with the shell, and the welding is more firm.

[0046] The above embodiment only expresses the preferred embodiment of the present utility model, and the description is more specific and detailed, but it cannot be understood as the limitation of the scope of the utility model patent. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the present utility model, a number of modifications and improvements can be made, which all belong to the protection scope of the present utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. An explosion-proof steel shell assembly comprising at least a shell having an open end and a cover plate closing the open end of the shell, characterized in that: The surface of the cover plate or the surface of the shell is formed with an explosion-proof notch, a residual thickness of the explosion-proof notch gradually increases or decreases from one end of the explosion-proof notch to the opposite end, and a flange structure is formed on the four peripheral edges of the cover plate and is matched with the inner wall of the shell.

2. The explosion-proof steel shell assembly of claim 1, wherein: The residual thickness of the thinner end of the explosion-proof notch is 0.07mm-0.09mm, and the residual thickness of the thicker end of the explosion-proof notch is 0.12mm-0.14mm.

3. The explosion-proof steel shell assembly of claim 2, wherein: The cover plate is integrally punched from a stainless steel plate with a thickness of 0.15mm-0.35mm, the shell is formed by bending and welding a stainless steel plate with a thickness of 0.15mm-0.25mm, and the cover plate is fixedly welded to the shell.

4. The explosion-proof steel shell assembly of claim 1, wherein: The flange structure includes a downward flange formed along the four peripheral edges of the cover plate, the outer wall of the flange is matched with the inner wall of the shell, the height of the flange is 0.5mm-0.7mm, and the upper surface of the cover plate is higher than the upper end surface of the shell by 0.2mm-0.4mm to form a welding step between the upper end surface of the shell and the upper surface of the cover plate.

5. The explosion-proof steel shell assembly of claim 1, wherein: The flange structure includes an open upward U-shaped flange formed along the four peripheral edges of the cover plate, the outer wall of the U-shaped flange is matched with the inner wall of the shell, the height of the U-shaped flange is 0.6mm-1.0mm, and the upper end surface of the U-shaped flange is higher than the upper end surface of the shell by 0.15mm-0.4mm to form a welding step between the upper end surface of the shell and the upper surface of the cover plate.

6. The explosion-proof steel shell assembly of claim 1, wherein: The flange structure includes an open upward U-shaped flange formed along the four peripheral edges of the cover plate, the outer wall of the U-shaped flange is matched with the inner wall of the shell, the height of the U-shaped flange is 0.6mm-1.0mm, and the upper end surface of the U-shaped flange is flush with the upper end surface of the shell.

7. The explosion-proof steel shell assembly of claim 1, wherein: The flange structure includes an open upward U-shaped flange formed along the four peripheral edges of the cover plate, the outer wall of the U-shaped flange is matched with the inner wall of the shell, the height of the U-shaped flange is 0.6mm-1.0mm, and the upper end surface of the U-shaped flange is flush with the upper end surface of the shell.

8. The explosion-proof steel shell assembly of claim 1, wherein: The flange structure includes an open upward U-shaped flange formed along the four peripheral edges of the cover plate, the outer wall of the U-shaped flange is matched with the inner wall of the shell, the height of the U-shaped flange is 0.6mm-1.0mm, and the upper end surface of the U-shaped flange is flush with the upper end surface of the shell.

9. The explosion-proof steel shell assembly of any one of claims 1 to 8, wherein: The projection of the track of the explosion-proof notch on the surface of the cover plate or the surface of the shell is an ellipse, a circle, a square, or a polygon. The explosion-proof notch is arranged on the upper surface or the lower surface of the cover plate; or 10. The explosion-proof steel shell assembly of claim 9, wherein: The explosion-proof notch is arranged on the outer wall or the inner wall of the shell. The cross section of the explosion-proof notch is a U-shaped groove, a V-shaped groove, or an inverted trapezoidal groove.

Images