Battery cell casing having explosion-proof valve, and manufacturing process therefor

Abstract

The present invention relates to the technical field of batteries, and provides a battery cell casing having an explosion-proof valve, and a manufacturing process therefor. The battery cell casing having an explosion-proof valve comprises: a casing arranged in a frame-like structure, wherein an explosion-proof valve mounting hole is formed in a side surface of the casing, a reinforcing part which is arranged integrally with the side surface where the explosion-proof valve mounting hole is located is provided along the edge of the explosion-proof valve mounting hole, the inner side surface of the reinforcing part is a horizontal surface, and the reinforcing part is in the shape of the Chinese character "几"; and an explosion-proof valve, embedded in the explosion-proof valve mounting hole, wherein connection between the explosion-proof valve and the casing is implemented by welding. According to the present invention, the reinforcing part is provided at the edge of the explosion-proof valve mounting hole, so as to improve the strength of an explosion-proof valve mounting area; moreover, there is no need to increase the overall thickness of the side surface where the explosion-proof valve is located, thereby reducing the processing difficulty and material cost of the entire battery cell casing.

Description

Explosion-proof valve battery core shell and preparation process thereof Technical Field

[0001] The invention belongs to the technical field of batteries and relates to an explosion-proof valve battery core shell and a preparation process thereof. Background Art

[0002] With the rapid development of lithium-ion battery technology, people have also put forward higher requirements for the safety performance of lithium-ion batteries. The pressure relief mechanism on the lithium-ion battery has a vital impact on the safety performance of the lithium-ion battery. For example, when the lithium-ion battery is short-circuited or overcharged, it may cause thermal runaway inside the lithium-ion battery and cause the internal air pressure to rise sharply. At this time, the pressure relief mechanism needs to be actuated to release the internal air pressure to the outside, thereby preventing the lithium-ion battery from exploding. As a key reliability structural unit, the explosion-proof valve plays a vital role in the stability of the shell strength.

[0003] The existing battery explosion-proof valve is installed on the shell of the battery cell, especially the current blade battery. The battery cell is thin. Starting the explosion-proof valve installation hole on the narrow side of the battery cell shell will greatly reduce the rigidity of the narrow side of the battery cell shell. When the internal pressure of the battery cell increases, the battery cell will be slightly deformed. Due to the existence of the installation hole, the deformation resistance of the battery shell at the installation hole is reduced. Therefore, the battery cell shell is prone to tearing at the installation hole, which in turn causes damage to the battery cell shell and the fall-off of the explosion-proof valve, seriously affecting the safety of the battery cell.

[0004] In order to improve the strength of the side where the explosion-proof valve installation hole is located, the thickness of the side where the explosion-proof valve installation hole is located is generally increased. However, such a structural design will increase the processing difficulty and increase the material cost of the battery cell shell. Technical issues

[0005] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide an explosion-proof valve battery core shell, which can improve the strength of the location of the explosion-proof valve mounting hole and avoid the increase in processing difficulty and material cost. Technical Solutions

[0006] The purpose of the present invention is to address the above-mentioned problems in the existing technology and to propose a battery core shell that can improve the strength of the location where the explosion-proof valve mounting hole is located and avoid the increase in processing difficulty and material cost.

[0007] The purpose of the present invention can be achieved through the following technical solutions: an explosion-proof valve battery core shell, comprising:

[0008] The housing is provided with a frame-shaped structure, and an explosion-proof valve mounting hole is provided on the side of the housing. A reinforcement portion is provided along the edge of the explosion-proof valve mounting hole and is integrally provided with the side where the explosion-proof valve mounting hole is located. The inner side surface of the reinforcement portion is a horizontal plane, and the reinforcement portion is provided in an X shape.

[0009] The explosion-proof valve is embedded in the explosion-proof valve installation hole, and the connection between the explosion-proof valve and the shell is completed by welding.

[0010] In the above-mentioned explosion-proof valve battery core shell, the reinforcement part includes a first reinforcement platform connected to the shell, and a second reinforcement platform for supporting the explosion-proof valve, and a reinforcement boss is provided between the first reinforcement platform and the second reinforcement platform, wherein the inner and outer side surfaces of the first reinforcement platform are respectively the first reinforcement outer plane and the first reinforcement inner plane, and the inner and outer side surfaces of the second reinforcement platform are respectively the second reinforcement outer plane and the second reinforcement inner plane, and the first reinforcement inner plane and the second reinforcement inner plane are on the same horizontal plane, wherein the second reinforcement outer plane serves as the installation plane of the explosion-proof valve and as the welding position between the explosion-proof valve and the shell.

[0011] In the above-mentioned explosion-proof valve battery core shell, the first reinforcement platform, the second reinforcement platform and the reinforcement boss are integrally arranged, and the thickness of the first reinforcement platform is greater than the thickness of the second reinforcement platform.

[0012] In the above-mentioned explosion-proof valve battery core shell, the explosion-proof valve includes a valve body and a skirt extending outward along the edge of the valve body, and the skirt is overlapped on the second reinforced outer plane of the second reinforced platform, wherein the valve body is convexly arranged or concavely arranged.

[0013] The present invention also provides an explosion-proof valve battery core shell, comprising:

[0014] A housing is provided in a frame-shaped structure, and an explosion-proof valve mounting hole is provided on the side of the housing. A reinforcement portion is provided along the edge of the explosion-proof valve mounting hole and is integrally provided with the side where the explosion-proof valve mounting hole is located. The inner side surface of the reinforcement portion is a horizontal plane, and the reinforcement portion is provided in a stepped shape.

[0015] The explosion-proof valve is embedded in the explosion-proof valve installation hole, and the connection between the explosion-proof valve and the shell is completed by welding.

[0016] In the above-mentioned explosion-proof valve battery core shell, the reinforcement part includes a first reinforcement platform connected to the shell, and a second reinforcement platform for supporting the explosion-proof valve, and a reinforcement boss is provided between the first reinforcement platform and the second reinforcement platform, wherein the inner and outer side surfaces of the first reinforcement platform are respectively a first reinforcement outer plane and a first reinforcement inner plane, the first reinforcement platform, the second reinforcement platform and the reinforcement boss are integrally arranged, the inner and outer side surfaces of the second reinforcement platform are respectively a second reinforcement outer plane and a second reinforcement inner plane, and the first reinforcement inner plane coincides with the second reinforcement inner plane, wherein the second reinforcement outer plane serves as the installation plane of the explosion-proof valve and as the welding position between the explosion-proof valve and the shell.

[0017] The present invention also provides an explosion-proof valve battery core shell, comprising:

[0018] The housing is provided with a frame-shaped structure, and an explosion-proof valve mounting hole is provided on the side of the housing. A reinforcement portion is provided along the edge of the explosion-proof valve mounting hole and is integrally provided with the side where the explosion-proof valve mounting hole is located. The inner surface of the reinforcement portion is provided in a stepped shape, and the reinforcement portion has an X-shaped structure.

[0019] The explosion-proof valve is embedded in the explosion-proof valve installation hole, and the connection between the explosion-proof valve and the shell is completed by welding.

[0020] In the above-mentioned explosion-proof valve battery core shell, the reinforcement part includes a first reinforcement platform connected to the shell, and a second reinforcement platform for supporting the explosion-proof valve, and a reinforcement boss is arranged between the first reinforcement platform and the second reinforcement platform, wherein the inner and outer side surfaces of the first reinforcement platform are respectively the first reinforcement outer plane and the first reinforcement inner plane, and the inner and outer side surfaces of the second reinforcement platform are respectively the second reinforcement outer plane and the second reinforcement inner plane, and the first reinforcement outer plane and the second reinforcement outer plane are on the same horizontal plane, and there is a height difference between the first reinforcement inner plane and the second reinforcement inner plane, wherein the second reinforcement outer plane serves as the installation plane of the explosion-proof valve and as the welding position between the explosion-proof valve and the shell.

[0021] In the above-mentioned explosion-proof valve battery core shell, a first beaded ring is provided at the intersection of the reinforcement boss and the first reinforcement platform, and the first beaded ring is located on the first reinforcement outer plane.

[0022] In the above-mentioned explosion-proof valve battery core shell, the inner and outer side surfaces of the reinforced boss are respectively the boss inner plane and the boss outer plane, and the two sides of the boss outer plane are respectively connected to the first reinforced outer plane and the second reinforced outer plane through the first boss connecting plane and the second boss connecting plane, wherein the intersection of the boss outer plane and the first boss connecting plane, and the intersection of the boss outer plane and the second boss connecting plane are both provided with chamfered corners R.

[0023] In the above-mentioned explosion-proof valve battery core shell, the intersection of the first reinforcement platform and the second reinforcement platform is concave to form a second rib ring.

[0024] In the above-mentioned explosion-proof valve battery core shell, the thickness H1 of the first reinforcement platform is between 0.2 mm and 0.8 mm, and the thickness H2 of the reinforcement boss is between 0.3 mm and 0.7 mm.

[0025] In the above-mentioned explosion-proof valve battery core shell, the depth of the first beaded ring is H3, and the reinforcing boss is arranged in a U-shaped structure, wherein the minimum width W1 between the side of the second beaded ring close to the second reinforcing platform and the connecting plane of the second boss is not less than the difference between H1 and H3.

[0026] The present invention also provides a battery, comprising the explosion-proof valve battery core shell.

[0027] The present invention also provides a process for preparing an explosion-proof valve battery core shell, comprising the following steps:

[0028] S1. Put the aluminum material onto the production line and pass it through a leveling machine for leveling treatment; S2. Put the leveled aluminum material through multiple rolling processes, and the aluminum material is gradually rolled up to form an initial shell with an elliptical cross-section and an open gap; S3. Connect the open gaps of the initial shell together through high-frequency welding; S4. Remove the raised weld beads at the welding point to make the welding point flat; S5. Use a shaping machine to shape the initial shell with an elliptical cross-section into a rectangular cross-section; S6. Cut to form a single shell; S7. Fine-cut and shape the incision of the single shell to obtain a shell; S8. Punch to form an explosion-proof valve mounting hole on the side of the shell; S9. Punch to form a bulge at the reinforcement part of the shell, and then reverse-punch the part of the bulge to form a second reinforcement platform, and the part of the bulge that is not reverse-punched forms a reinforcement boss; S10. Then embed the explosion-proof valve into the explosion-proof valve mounting hole of the shell, and complete the connection between the explosion-proof valve and the shell by welding.

[0029] Preferably, the thickness of the aluminum material is less than 0.8 mm.

[0030] Preferably, the number of multi-pass rolling is any integer between 6 and 15. The cross-section of the aluminum material formed by each rolling pass is an axisymmetric structure. In each rolling pass, the aluminum material is rolled up toward the axis of symmetry, and the angle of each rolling is 5 to 35 degrees. After 6 to 15 rolling passes, a shell structure with an elliptical cross-section and an open gap is finally formed.

[0031] As shown in Figure 14, the edge of the aluminum profile is warped. The warping point is A, the intersection of the symmetry axis of the aluminum profile's cross section with the aluminum profile's cross section is O, and the angle β between the line between A and O and the symmetry axis of the aluminum profile's cross section is β. The angle of each roll is the difference between the angle β of the aluminum profile obtained from the previous roll and the angle β of the current roll.

[0032] The roller assembly structure used in each rolling pass is different and is generally divided into two types: Type I and Type II. Type I roller assemblies consist of upper and lower rollers. The upper roller has a circumferential flange, while the lower roller has an annular groove. The flange of the upper roller and the annular groove of the lower roller cooperate to roll the aluminum into a specific shape. The structure of the Type I roller assembly used in each rolling pass is different, specifically the structure of the flange and the annular groove.

[0033] The second type of roller assembly consists of an upper roller and a lower roller. The upper roller has an upper groove along its circumference, while the lower roller has a lower groove along its circumference. The upper and lower grooves form a cavity that forms a mold that rolls the aluminum material into a specific shape, particularly an elliptical cross-section. The second type of roller assembly used in each rolling pass is also different, specifically the structure of the upper and lower grooves.

[0034] Preferably, when the angle β is 35-90° (including 35°), the first type of roller group is used for rolling; when the angle β is 10-35° (excluding 35°), the second type of roller group is used for rolling.

[0035] Preferably, the width of the opening gap of the initial shell is 0.5-3 mm.

[0036] Preferably, the high-frequency welding is induction high-frequency welding. The specific process of induction high-frequency welding is as follows: the initial shell first passes through a high-frequency induction coil to generate a high-frequency current, causing the opening gap of the initial shell to rapidly heat up and melt. After the initial shell enters the pass of the extrusion roller, the extrusion roller applies pressure to the initial shell, and the melted opening gap is welded to form a weld bead, thereby completing the welding of the opening gap.

[0037] The shape of the initial shell obtained in step S2 must correspond to the shape of the squeeze roller pass, so that the initial shell can enter the squeeze roller pass and be squeezed by the squeeze roller to achieve high-frequency welding.

[0038] Preferably, the housing obtained in step S7 is a double-pass structure, which means that the top and bottom surfaces of the housing are open. Beneficial effects

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] (1) The present invention provides an explosion-proof valve battery cell shell, which improves the strength of the explosion-proof valve installation area by providing a reinforcement portion at the edge of the explosion-proof valve installation hole without increasing the thickness of the side where the explosion-proof valve is located as a whole, thereby reducing the processing difficulty and material cost of the entire battery cell shell.

[0041] (2) The first reinforced inner plane and the second reinforced inner plane are arranged to have a height difference in order to prevent scratches during the assembly of the internal battery cells, thereby improving the safety of the battery cell assembly.

[0042] (3) By arranging a first rib ring on the outer side plane of the first reinforcement, the reinforcement boss is prevented from affecting the flatness of the outer side plane of the first reinforcement during extrusion molding, thereby improving the processing accuracy of the entire reinforcement part.

[0043] (4) By setting a second rib ring, the flatness of the outer surface of the boss is ensured during the extrusion molding of the boss, and the angle of the fillet is reduced as much as possible, thereby improving the welding quality between the explosion-proof valve and the shell.

[0044] (5) The traditional shell formed by stamping has an aluminum material utilization rate of only 50-60%, while the shell of the present invention adopts multi-pass roll forming, and the aluminum material utilization rate reaches 95%. Moreover, the shell is prepared by multi-pass roll forming, which greatly improves the production efficiency and the space utilization rate of the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] FIG1 is a schematic structural diagram of an explosion-proof valve battery core shell of the present invention.

[0046] FIG2 is a schematic structural diagram of an explosion-proof valve battery core shell according to the present invention from another perspective.

[0047] FIG3 is a cross-sectional view taken along line AA in FIG2 .

[0048] FIG4 is an enlarged structural diagram of point A in FIG3 .

[0049] FIG5 is a cross-sectional view of another embodiment of a battery cell housing provided with an explosion-proof valve according to the present invention.

[0050] FIG6 is an enlarged structural diagram of point B in FIG5 .

[0051] FIG7 is a schematic structural diagram of an explosion-proof valve battery core housing in the third embodiment of the present invention with the explosion-proof valve in an upright position.

[0052] FIG8 is a cross-sectional view taken along line BB in FIG7 .

[0053] FIG9 is an enlarged structural diagram of point C in FIG8 .

[0054] FIG10 is a schematic structural diagram of an explosion-proof valve battery core housing according to the present invention in which the explosion-proof valve is inverted in the third embodiment.

[0055] FIG11 is a cross-sectional view of CC shown in FIG10 .

[0056] FIG12 is an enlarged structural diagram of point D in FIG11 .

[0057] FIG13 is a cross-sectional view of a reinforcement portion in a third embodiment of the present invention.

[0058] FIG14 is a cross-sectional view of the aluminum material obtained by each rolling process in Example 4 of the present invention.

[0059] FIG15 is a cross-sectional view of the roller assembly structure used in the second rolling pass in Example 4 of the present invention.

[0060] FIG16 is a cross-sectional view of the roller assembly structure used in the 9th rolling pass in Example 4 of the present invention.

[0061] FIG17 is a process diagram of punching, bump forming, and reverse punching in Example 4 of the present invention.

[0062] In the figure, 10, housing; 11, explosion-proof valve mounting hole; 20, reinforcement portion; 21, first reinforcement platform; 211, first reinforcement outer plane; 212, first reinforcement inner plane; 213, first rib ring; 22, second reinforcement platform; 221, second reinforcement outer plane; 222, second reinforcement inner plane; 23, reinforcement boss; 231, boss outer plane; 232, boss inner plane; 233, first boss connecting plane; 23 4. Second boss connecting plane; 235. Second rib ring; 30. Explosion-proof valve; 31. Valve body; 32. Skirt; 4. Axis of symmetry of the aluminum cross section; 52. Upper roller for the second rolling pass; 62. Lower roller for the second rolling pass; 521. Flange; 621. Annular groove; 59. Upper roller for the ninth rolling pass; 69. Lower roller for the ninth rolling pass; 591. Upper groove; 691. Lower groove; 7. Bump; 100. Opening gap. Modes for Carrying Out the Invention

[0063] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0064] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. Example 1

[0065] As shown in Figures 1 to 4, the present invention provides an explosion-proof valve battery core shell, comprising:

[0066] A housing 10 is provided in a frame-shaped structure, and an explosion-proof valve mounting hole 11 is provided on the side of the housing 10. A reinforcement portion 20 is provided along the edge of the explosion-proof valve mounting hole 11 and is integrally provided with the side where the explosion-proof valve mounting hole 11 is located. The inner side surface of the reinforcement portion 20 is a horizontal plane, and the reinforcement portion 20 is provided in an X shape.

[0067] The explosion-proof valve 30 is embedded in the explosion-proof valve installation hole 11 , and the connection between the explosion-proof valve 30 and the housing 10 is completed by welding.

[0068] The present invention provides an explosion-proof valve battery core shell, which improves the strength of the explosion-proof valve 30 installation area by providing a reinforcement portion 20 at the edge of the explosion-proof valve installation hole 11 without increasing the thickness of the side where the explosion-proof valve 30 is located as a whole, thereby reducing the processing difficulty and material cost of the entire battery core shell.

[0069] Further preferably, the reinforcement portion 20 includes a first reinforcement platform 21 connected to the shell 10, and a second reinforcement platform 22 for supporting the explosion-proof valve 30, and a reinforcement boss 23 is arranged between the first reinforcement platform 21 and the second reinforcement platform 22, wherein the first reinforcement platform 21, the second reinforcement platform 22 and the reinforcement boss 23 are arranged as a whole, and the thickness of the first reinforcement platform 21 is greater than the thickness of the second reinforcement platform 22.

[0070] Further preferably, the inner and outer side surfaces of the first reinforcement platform 21 are respectively the first reinforcement outer plane 211 and the first reinforcement inner plane 212, and the inner and outer side surfaces of the second reinforcement platform 22 are respectively the second reinforcement outer plane 221 and the second reinforcement inner plane 222, and the first reinforcement inner plane 212 and the second reinforcement inner plane 222 are on the same horizontal plane, wherein the second reinforcement outer plane 221 serves as the installation plane of the explosion-proof valve 30 and as the welding position between the explosion-proof valve 30 and the shell 10.

[0071] Preferably, the explosion-proof valve 30 includes a valve body 31 and a skirt 32 extending outward along the edge of the valve body 31, and the skirt 32 is overlapped on the second reinforced outer plane 221 of the second reinforced platform 22, wherein the valve body 31 is convex or concave.

[0072] Further preferably, the surface of the explosion-proof valve 30 is provided with notches. Example 2

[0073] As shown in FIG5 and FIG6, the present invention also provides an explosion-proof valve battery core shell, comprising:

[0074] A housing 10 is provided in a frame-shaped structure, and an explosion-proof valve mounting hole 11 is provided on the side of the housing 10. A reinforcement portion 20 is provided along the edge of the explosion-proof valve mounting hole 11 and is integrally provided with the side where the explosion-proof valve mounting hole 11 is located. The inner side surface of the reinforcement portion 20 is a horizontal plane, and the reinforcement portion 20 is provided in a stepped manner.

[0075] The explosion-proof valve 30 is embedded in the explosion-proof valve mounting hole 11 and connected to the housing 10 by welding. Further preferably, the reinforcement portion 20 includes a first reinforcement platform 21 connected to the housing 10 and a second reinforcement platform 22 for supporting the explosion-proof valve 30, with a reinforcement boss 23 provided between the first reinforcement platform 21 and the second reinforcement platform 22. The first reinforcement platform 21, the second reinforcement platform 22, and the reinforcement boss 23 are integrally formed, and the thickness of the first reinforcement platform 21 is greater than the thickness of the second reinforcement platform 22.

[0076] Further preferably, the inner and outer side surfaces of the first reinforcement platform 21 are respectively the first reinforcement outer plane 211 and the first reinforcement inner plane 212, and the inner and outer side surfaces of the second reinforcement platform 22 are respectively the second reinforcement outer plane 221 and the second reinforcement inner plane 222, and the first reinforcement inner plane 212 coincides with the second reinforcement inner plane 222, wherein the second reinforcement outer plane 221 serves as the installation plane of the explosion-proof valve 30 and as the welding position between the explosion-proof valve 30 and the shell 10.

[0077] It is worth mentioning that in embodiment one, since the reinforcement portion 20 is arranged in a cross-shaped structure, although the first reinforcement inner plane 212 and the second reinforcement inner plane 222 are on the same horizontal plane, the first reinforcement inner plane 212 and the second reinforcement inner plane 222 do not overlap. In this embodiment, since the reinforcement portion 20 is arranged in a stepped structure, and the first reinforcement platform 21, the second reinforcement platform 22 and the reinforcement boss 23 are all solid structures, the first reinforcement inner plane 212 and the second reinforcement inner plane 222 overlap.

[0078] Preferably, the explosion-proof valve 30 includes a valve body 31 and a skirt 32 extending outward along the edge of the valve body 31, and the skirt 32 is overlapped on the second reinforced outer plane 221 of the second reinforced platform 22, wherein the valve body 31 is convex or concave.

[0079] Further preferably, the surface of the explosion-proof valve 30 is provided with notches. Example 3

[0080] As shown in Figures 7 to 13, the present invention also provides an explosion-proof valve battery core shell, comprising:

[0081] A housing 10 is provided in a frame-shaped structure, and an explosion-proof valve mounting hole 11 is provided on the side of the housing 10. A reinforcement portion 20 is provided along the edge of the explosion-proof valve mounting hole 11 and is integrally provided with the side where the explosion-proof valve mounting hole 11 is located. The inner surface of the reinforcement portion 20 is provided in a stepped shape, and the reinforcement portion 20 is in an X-shaped structure.

[0082] The explosion-proof valve 30 is embedded in the explosion-proof valve installation hole 11 , and the connection between the explosion-proof valve 30 and the housing 10 is completed by welding.

[0083] It is worth mentioning that, compared with Example 1, although the reinforcing portion 20 in Example 1 and the reinforcing portion 20 in this embodiment are both of an X-shaped structure, the inner side surface of the reinforcing portion 20 in Example 1 is a horizontal plane, while the inner side surface of the reinforcing portion 20 in this embodiment is a stepped surface.

[0084] Further preferably, the reinforcement portion 20 includes a first reinforcement platform 21 connected to the shell 10, and a second reinforcement platform 22 for supporting the explosion-proof valve 30, and a reinforcement boss 23 is arranged between the first reinforcement platform 21 and the second reinforcement platform 22, wherein the first reinforcement platform 21, the second reinforcement platform 22 and the reinforcement boss 23 are arranged as a whole, and the thickness of the first reinforcement platform 21 is greater than the thickness of the second reinforcement platform 22.

[0085] Preferably, the inner and outer side surfaces of the first reinforcement platform 21 are respectively the first reinforcement outer plane 211 and the first reinforcement inner plane 212, and the inner and outer side surfaces of the second reinforcement platform 22 are respectively the second reinforcement outer plane 221 and the second reinforcement inner plane 222, and the first reinforcement outer plane 211 and the second reinforcement outer plane 221 are on the same horizontal plane, and there is a height difference between the first reinforcement inner plane 212 and the second reinforcement inner plane 222, wherein the second reinforcement outer plane 221 serves as the installation plane of the explosion-proof valve 30 and as the welding position between the explosion-proof valve 30 and the shell 10.

[0086] In this embodiment, the first reinforced inner plane 212 and the second reinforced inner plane 222 are provided with a height difference in order to prevent scratches during assembly of the internal battery cells, thereby improving the safety of the battery cell assembly.

[0087] Preferably, a first beaded ring 213 is provided at the intersection of the reinforcing boss 23 and the first reinforcing platform 21 , and the first beaded ring 213 is located on the first reinforcing outer plane 211 .

[0088] In this embodiment, by providing the first embossing ring 213 on the first reinforcement outer plane 211 , the reinforcement boss 23 is prevented from affecting the flatness of the first reinforcement outer plane 211 during extrusion molding, thereby improving the processing accuracy of the entire reinforcement portion 20 .

[0089] It is worth mentioning that the first pressing bead ring 213 is arranged in the form of an annular groove.

[0090] Preferably, the inner and outer side surfaces of the reinforcing boss 23 are respectively the boss outer plane 231 and the boss inner plane 232, and the two sides of the boss outer plane 231 are respectively connected to the first reinforcing outer plane 211 and the second reinforcing outer plane 221 through the first boss connecting plane 233 and the second boss connecting plane 234, wherein the intersection of the boss outer plane 231 and the first boss connecting plane 233, and the intersection of the boss outer plane 231 and the second boss connecting plane 234 are both provided with chamfers R.

[0091] Preferably, a second ribbed ring 235 is formed inwardly at the intersection of the first reinforcement platform 21 and the second reinforcement platform 22 .

[0092] In this embodiment, the second bead ring 235 is provided to ensure the flatness of the outer surface 231 of the boss 23 during extrusion molding, while minimizing the angle of the fillet as much as possible, thereby improving the welding quality between the explosion-proof valve 30 and the housing 10.

[0093] Preferably, the explosion-proof valve 30 includes a valve body 31 and a skirt 32 extending outward along the edge of the valve body 31, and the skirt 32 is connected to the second reinforcement platform 22, wherein the valve body 31 is convex or concave.

[0094] Further preferably, the surface of the explosion-proof valve 30 is provided with notches.

[0095] Preferably, the thickness H1 of the first reinforcing platform 21 is 0.2 mm-0.8 mm, preferably 0.4 mm-0.6 mm, so as to save material.

[0096] Preferably, the thickness H2 of the reinforcing boss 23 is between 0.3 mm and 0.7 mm, preferably between 0.5 mm and 0.6 mm, and the thickness H2 is not less than the thickness H1, so as to avoid breakdown during welding.

[0097] Preferably, the first bead ring 213 has a depth of H3, and the reinforcing boss 23 is arranged in a U-shaped structure. The minimum width W1 between the side of the second bead ring 235 near the second reinforcing platform 22 and the second boss connecting plane 234 is not less than the difference between H1 and H3. This helps prevent product damage due to welding stress during welding and improves product reliability. Example 4

[0098] The present invention also provides a process for preparing the housing 10, comprising the following steps:

[0099] S1. Put the aluminum material with a thickness of 0.7mm into the production line and pass it through the flattening machine for flattening treatment; S2. Put the flattened aluminum material through 9 rolling processes, and the aluminum material is gradually rolled up to form an initial shell with an elliptical cross-section and an opening gap 100. The width of the opening gap 100 is 1.5mm; S3. Connect the opening gap 100 of the initial shell together through induction high-frequency welding. The specific steps are: the initial shell first passes through a high-frequency induction coil to generate a high-frequency current, so that the opening gap 100 of the initial shell is rapidly heated to melt. After the initial shell enters the extrusion roller pass, the extrusion roller applies pressure to the initial shell, and the melted opening gap 100 is welded and bonded to form a weld bead, thereby completing the welding of the opening gap 100; the shape of the initial shell obtained in step S2 must be consistent with the shape of the extrusion roller. The shapes of the roller holes correspond to each other, so that the initial shell can enter the hole of the extrusion roller, so that it can be squeezed by the extrusion roller to achieve high-frequency welding; S4, remove the raised weld at the welding point to make the welding point smooth; S5, use a shaping machine to shape the initial shell with an elliptical cross-section into a rectangular cross-section; S6, cut to form a single shell; S7, perform precision cutting and shaping on the incision of the single shell to obtain the shell; S8, punch to form an explosion-proof valve mounting hole on the side of the shell; S9, punch to form a bulge at the reinforcement part of the shell, and then reverse punch the part of the bulge to form a second reinforcement platform, and the part of the bulge that is not reverse punched is formed into a reinforcement boss; S10, then embed the explosion-proof valve in the explosion-proof valve mounting hole of the shell, and complete the connection between the explosion-proof valve and the shell by welding.

[0100] Figure 14 shows the cross-section of the aluminum material obtained during each rolling process. The cross-section of the aluminum material formed during each rolling process is axially symmetrical. With each rolling process, the aluminum material curls up toward the axis of symmetry 4 of the aluminum cross-section, with each curling angle ranging from 5° to 35°. After nine rolling processes, the aluminum material gradually curls up, ultimately forming a shell structure with an elliptical cross-section and an open gap 100°. As shown in Figure 14, the edges of the aluminum material are warped. In the cross-section, the warping point A is the point of intersection, the axis of symmetry 4 of the aluminum cross-section and the intersection of the aluminum cross-section are at O, and the angle β between the line between the warping point A and the intersection O and the axis of symmetry 4 of the aluminum cross-section is the angle β. The angle of each curling process refers to the difference between the angle β of the aluminum material obtained during the previous rolling process and the angle β of the aluminum material obtained during the current rolling process.

[0101] Each rolling pass uses a different roller assembly structure. In this embodiment, the first to sixth rolling passes use the first type of roller assembly, and the seventh to ninth rolling passes use the second type of roller assembly. The angle β of the aluminum material obtained by the sixth rolling pass is approximately 18°.

[0102] Figure 15 is a cross-sectional view of the roller assembly used in the second rolling pass. The roller assembly includes an upper roller 52 and a lower roller 62. The upper roller 52 has a circumferential flange 521, while the lower roller 62 has a circumferential annular groove 621. The flange 521 of the upper roller 52 and the annular groove 621 of the lower roller 62 cooperate to roll the aluminum material 72 into a specific shape. The first type of roller assembly used in the first through sixth rolling passes differs in structure, specifically in the configuration of the flanges and annular grooves.

[0103] Figure 16 is a cross-sectional view of the roller assembly used in the ninth rolling pass. The roller assembly includes upper roller 59 and lower roller 69. Upper roller 59 is circumferentially provided with an upper groove 591, while lower roller 69 is circumferentially provided with a lower groove 691. The cavity formed by the upper groove 591 of upper roller 59 and the lower groove 691 of lower roller 69 rolls the aluminum material into an elliptical cross-section. The second type of roller assembly used in the seventh through ninth rolling passes differs in structure, specifically in the configuration of the upper and lower grooves.

[0104] As shown in FIG17 , the shell 10 obtained in step S7 is punched to form an explosion-proof valve mounting hole 11 on the side of the shell 10 ; a protrusion 7 is punched at the reinforcement portion 20 of the shell 10 , and then a portion of the protrusion 7 is reverse punched (reverse punching refers to punching in the opposite direction of the aforementioned punching) to form a second reinforcement platform 22 , and the portion of the protrusion that is not reverse punched is formed as a reinforcement boss 23 .

[0105] It should be noted that, in the present invention, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly defined. The terms "connected", "fixed", etc. should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0106] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0107] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. An explosion-proof valve battery core shell, characterized in that: include: A housing is provided in a frame-shaped structure, and an explosion-proof valve installation hole is provided on the side of the housing, wherein a reinforcement portion is provided along the edge of the explosion-proof valve installation hole and is integrally provided with the side where the explosion-proof valve installation hole is located, the inner side surface of the reinforcement portion is a horizontal plane, and the reinforcement portion is provided in a "X" shape; The explosion-proof valve is embedded in the explosion-proof valve installation hole, and the connection between the explosion-proof valve and the shell is completed by welding.

2. The explosion-proof valve battery core shell according to claim 1, characterized in that: The reinforcement part includes a first reinforcement platform connected to the shell, and a second reinforcement platform for carrying the explosion-proof valve, and a reinforcement boss is arranged between the first reinforcement platform and the second reinforcement platform, wherein the inner and outer side surfaces of the first reinforcement platform are respectively a first reinforcement outer plane and a first reinforcement inner plane, and the inner and outer side surfaces of the second reinforcement platform are respectively a second reinforcement outer plane and a second reinforcement inner plane, and the first reinforcement inner plane and the second reinforcement inner plane are on the same horizontal plane, wherein the second reinforcement outer plane serves as the installation plane of the explosion-proof valve and as the welding position of the explosion-proof valve and the shell.

3. The explosion-proof valve battery core shell according to claim 2, characterized in that: The first reinforcing platform, the second reinforcing platform and the reinforcing boss are integrally arranged, and the thickness of the first reinforcing platform is greater than the thickness of the second reinforcing platform.

4. The explosion-proof valve battery core shell according to claim 2, characterized in that: The explosion-proof valve comprises a valve body and a skirt extending outwardly along the edge of the valve body, and the skirt is overlapped on the second reinforced outer plane of the second reinforced platform, wherein the valve body is convexly arranged or concavely arranged.

5. An explosion-proof valve battery core shell, characterized in that: include: A housing is provided in a frame-shaped structure, and an explosion-proof valve installation hole is provided on the side of the housing, wherein a reinforcement portion is provided along the edge of the explosion-proof valve installation hole and is integrally provided with the side where the explosion-proof valve installation hole is located, the inner side surface of the reinforcement portion is a horizontal plane, and the reinforcement portion is provided in a stepped shape; The explosion-proof valve is embedded in the explosion-proof valve installation hole, and the connection between the explosion-proof valve and the shell is completed by welding.

6. The explosion-proof valve battery core shell according to claim 5, characterized in that: The reinforcement part includes a first reinforcement platform connected to the shell, and a second reinforcement platform for carrying the explosion-proof valve, and a reinforcement boss is arranged between the first reinforcement platform and the second reinforcement platform, wherein the inner and outer side surfaces of the first reinforcement platform are respectively a first reinforcement outer plane and a first reinforcement inner plane, the first reinforcement platform, the second reinforcement platform and the reinforcement boss are integrally arranged, the inner and outer side surfaces of the second reinforcement platform are respectively a second reinforcement outer plane and a second reinforcement inner plane, and the first reinforcement inner plane coincides with the second reinforcement inner plane, wherein the second reinforcement outer plane serves as the installation plane of the explosion-proof valve and as the welding position of the explosion-proof valve and the shell.

7. An explosion-proof valve battery core shell, characterized in that: include: A housing is provided in a frame-shaped structure, and an explosion-proof valve installation hole is provided on the side of the housing, wherein a reinforcement portion is provided along the edge of the explosion-proof valve installation hole and is integrally provided with the side where the explosion-proof valve installation hole is located, and the inner side surface of the reinforcement portion is provided in a stepped shape, and the reinforcement portion is in a "X"-shaped structure; The explosion-proof valve is embedded in the explosion-proof valve installation hole, and the connection between the explosion-proof valve and the shell is completed by welding.

8. The explosion-proof valve battery core shell according to claim 7, characterized in that: The reinforcement part includes a first reinforcement platform connected to the shell, and a second reinforcement platform for carrying the explosion-proof valve, and a reinforcement boss is arranged between the first reinforcement platform and the second reinforcement platform, wherein the inner and outer side surfaces of the first reinforcement platform are respectively the first reinforcement outer plane and the first reinforcement inner plane, and the inner and outer side surfaces of the second reinforcement platform are respectively the second reinforcement outer plane and the second reinforcement inner plane, and the first reinforcement outer plane and the second reinforcement outer plane are on the same horizontal plane, and there is a height difference between the first reinforcement inner plane and the second reinforcement inner plane, wherein the second reinforcement outer plane serves as the installation plane of the explosion-proof valve and as the welding position of the explosion-proof valve and the shell.

9. The explosion-proof valve battery core shell according to claim 8, characterized in that: A first beading ring is arranged at the intersection of the reinforcing boss and the first reinforcing platform, and the first beading ring is located on the first reinforcing outer side plane.

10. The explosion-proof valve battery core shell according to claim 8, characterized in that: The inner and outer side surfaces of the reinforcing boss are respectively the boss inner plane and the boss outer plane, and the two sides of the boss outer plane are respectively connected to the first reinforcing outer plane and the second reinforcing outer plane through the first boss connecting plane and the second boss connecting plane, wherein the intersection line of the boss outer plane and the first boss connecting plane, and the intersection line of the boss outer plane and the second boss connecting plane are both provided with chamfered corners R.

11. The explosion-proof valve battery core shell according to claim 9, characterized in that: The intersection of the first reinforcement platform and the second reinforcement platform is concave to form a second ribbed ring.

12. The explosion-proof valve battery core shell according to claim 8, characterized in that: The thickness H1 of the first reinforcing platform is between 0.2 mm and 0.8 mm, and the thickness H2 of the reinforcing boss is between 0.3 mm and 0.7 mm.

13. The explosion-proof valve battery core shell according to claim 11, characterized in that: The depth of the first embossing ring is H3, and the reinforcing boss is arranged in a U-shaped structure, wherein the minimum width W1 between the side of the second embossing ring close to the second reinforcing platform and the connecting plane of the second boss is not less than the difference between H1 and H3.

14. A battery, characterized in that: An explosion-proof valve battery core shell comprising any one of claims 1 to 13.

15. The process for preparing the explosion-proof valve battery core shell according to any one of claims 1, 5 and 7, characterized in that: The following steps are involved: S1. Put the aluminum material into the production line and pass it through the leveling machine for leveling treatment; S2, subjecting the flattened aluminum material to a multi-pass rolling process, so that the aluminum material is gradually rolled up to form an initial shell having an elliptical cross section and an open gap; S3, connecting the opening gaps of the initial shell together by high frequency welding; S4. Remove the raised weld beads at the welding point to make the welding point smooth; S5, shaping the initial shell with an elliptical cross section into a rectangular cross section by a shaping machine; S6, cutting to form a single shell; S7, performing precision cutting and shaping processing on the cutout of the single shell to obtain the shell; S8, punching to form an explosion-proof valve installation hole on the side of the shell; S9, punching a convex block at the reinforcement portion of the shell, and then reverse punching a portion of the convex block to form a second reinforcement platform, and a portion of the convex block that is not reverse punched is formed as a reinforcement boss; S10, then embed the explosion-proof valve into the explosion-proof valve installation hole of the shell, and complete the connection between the explosion-proof valve and the shell by welding.

16. The preparation process according to claim 15, characterized in that: The thickness of aluminum material is less than 0.8mm.

17. The preparation process according to claim 15, characterized in that: The number of multi-pass rolling is any integer between 6 and 15.

18. The preparation process according to claim 15, characterized in that: The width of the opening gap of the initial shell is 0.5~3mm.

19. The preparation process according to claim 15, characterized in that: The high frequency welding is induction high frequency welding.

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