Top cover assembly and secondary battery cell

Abstract

The top cover assembly comprises a base plate which comprises a base body part provided with a first through hole in a penetrating mode; the isolation pad covers the base body part on the periphery of the first through hole, and a second through hole coaxial with the first through hole is formed in the isolation pad in a penetrating manner; the insulating part covers the lower side of the substrate, and a third through hole corresponding to the first through hole is formed in the insulating part in a penetrating manner; the pole comprises a pole body, a lower limiting part and an upper limiting part, the lower limiting part is formed by protruding from the lower end of the pole body along the radial outer side, the upper limiting part is formed by protruding from the upper end of the pole body along the radial outer side, the lower limiting part abuts against the insulating part, and the upper limiting part abuts against the upper portion of the isolation pad; the base part on the periphery of the first through hole is clamped between the lower limiting part and the upper limiting part; the sealing ring is clamped between the lower limiting part and the base body part; and a steel pad is clamped between the upper limiting part and the isolation pad. The utility model also discloses a secondary battery cell.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of batteries, and in particular to a top cover assembly and a secondary battery cell. BACKGROUND

[0002] Secondary batteries refer to batteries that can be repeatedly charged and discharged. At present, secondary batteries are widely used as automobile power devices and energy storage devices, which has brought about significant changes in the energy structure of society and greatly reduced carbon emissions from automobiles. A plurality of secondary battery cells are combined into a battery pack to store and release electrical energy to electrical devices. Secondary battery cells include various types, such as cylindrical, square, and blade-shaped structures. Existing square batteries generally include a battery shell with two open ends and other closed faces, a cell material mounted in the battery shell, and a battery top cover closing the two open ends of the battery shell. During assembly, the cell material is first mounted in the space of the battery shell, and then two battery top covers are used to close the two open ends of the battery shell. Before closing the two open ends of the battery shell, the cell material needs to be electrically connected to the pole post on the battery top cover. In this process, the cell is mounted in the space of the battery shell and then welded to the battery top cover, which has the problems of limited operation space and complicated process. It is necessary to optimize the product structure and develop a more simplified and easy-to-operate assembly method.

[0003] At the same time, the battery top cover of the traditional secondary battery is usually attached to the outside of the battery shell from the open end and welded and sealed. This structure limits the battery shell with two open ends from being welded and fixed with the cell before assembly, and only a certain welding space is left to weld the adapter piece and then buckle it to the outside of the battery shell for sealing and welding. At the same time, part of the cylindrical pole post will also rotate. Traditionally, part of the cylindrical surface is made into a straight surface shape to prevent rotation, but this will affect the current carrying capacity and strength of the product. SUMMARY

[0004] Therefore, it is necessary to provide a top cover assembly and a secondary battery cell that can prevent the upper limiting portion of the pole post from damaging the isolation pad during riveting.

[0005] To solve the above technical problems, the application provides a top cover assembly, which comprises a base plate, a base body part with a first through hole formed therethrough; an isolation pad covering the base body part around the first through hole, the isolation pad having a second through hole formed therethrough coaxially with the first through hole; an insulating part covering the lower side of the base plate and having a third through hole formed therethrough corresponding to the first through hole; a pole including a column, a lower limiting part protruding radially outward from the lower end of the column, and an upper limiting part protruding radially outward from the upper end of the column, the lower limiting part abutting against the insulating part, and the upper limiting part abutting above the isolation pad; the base body part around the first through hole being clamped between the lower limiting part and the upper limiting part; and a sealing ring being clamped between the lower limiting part and the base body part, wherein a steel pad is clamped between the upper limiting part and the isolation pad.

[0006] Preferably, before the pole is assembled, the upper limiting part of the pole is not outwardly folded, and the outer surface of the upper limiting part does not exceed the outer surface of the column radially outwardly, and after the pole is assembled, the vertical upper limiting part is outwardly folded and pressed above the isolation pad to fix the pole on the base plate.

[0007] Preferably, the steel pad is sleeved around the column periphery before the upper limiting part is folded.

[0008] Preferably, the steel pad includes a steel pad ring clamped between the isolation pad and the upper limiting part, and a steel pad flange upwardly folded from the periphery of the steel pad ring, the steel pad flange being at least partially arranged around the radial outer edge of the upper limiting part.

[0009] Preferably, the base body part is recessed to form an inner ring groove and an outer ring groove on the inner and outer sides around the first through hole respectively, the isolation pad is limited in the outer ring groove, and the base body part is protruded to form an inner ring groove protruding part towards the inner ring groove.

[0010] Preferably, the isolation pad includes a horizontal pad ring at least partially accommodated in the outer ring groove, an outer edge upward extending part extending upwardly from the outer edge of the horizontal pad ring, and an inner edge downward extending part extending downwardly from the inner edge of the horizontal pad ring, the inner edge downward extending part being clamped into the first through hole, and the outer edge upward extending part limiting the steel pad flange inwardly.

[0011] Preferably, the lower end of the column of the pole is located on the inner side of the base plate, the upper end of the column is exposed on the outer side of the base plate, and the periphery of the lower limiting part is provided with an anti-rotation notch.

[0012] Preferably, the insulating member comprises a connecting body limited in the inner ring groove, an insulating main body extending radially outward from the lower end of the connecting body, and an isolation part extending radially inward from the connecting body, the connecting body is partially recessed radially inward to form an anti-rotation groove, and a convex anti-rotation part is formed below the isolation part on the other side of the anti-rotation groove, the inner ring groove convex part of the base body part is clamped into the anti-rotation groove of the insulating member, the anti-rotation convex part of the insulating member is clamped into the anti-rotation notch of the pole column, and the lower limiting part is limited within the range set by the connecting body and at least partially abuts the lower side of the isolation part.

[0013] Preferably, the sealing ring comprises a first sealing ring body clamped between the lower limiting part and the surface of the inner ring groove, and a second sealing ring body extending upward from the inner edge of the first sealing ring body and clamped between the outer surface of the column body and the hole wall of the first through hole, the second sealing ring body is also extruded and deformed by the inner edge lower extension part and the lower limiting part.

[0014] To solve the above technical problems, the application also provides a secondary battery monomer, which comprises the aforementioned top cover assembly and a shell, the shell comprises a peripheral wall surrounding a cavity and an opening formed at one longitudinal end of the peripheral wall, the base plate is adapted to the opening, and the inner side of the peripheral edge of the base plate is provided with an edge buckle groove, which is clamped on the peripheral wall and welded together.

[0015] Compared with the prior art, the pole column of the top cover assembly of the application is sleeved into the steel pad before riveting the upper limiting part, so that the steel pad is located on the isolation pad paper to bear the riveting force of the upper limiting part, which can effectively prevent the upper limiting part from crushing the isolation pad. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings described herein are used to provide further understanding of the application, and form a part of the application. The schematic embodiments of the application and their descriptions are used to explain the application, and do not constitute improper limitations on the application. In the drawings:

[0017] Figure 1 It is a perspective assembly view of the secondary battery monomer of the application;

[0018] Figure 2 It is a perspective assembly view of the secondary battery monomer of the application from another angle;

[0019] Figure 3 It is a perspective assembly view of another form of the secondary battery monomer of the application;

[0020] Figure 4 It is a perspective exploded view of the secondary battery monomer of the application;

[0021] Figure 5FIG. 2 is another perspective exploded view of the secondary battery cell of the present application;

[0022] Figure 6 FIG. 3 is a sectional view taken along the line A-A of FIG. 1; Figure 1

[0023] Figure 7 Figure 6

[0024] Figures 8 to 16 FIG. 6 is a front sectional view of an embodiment of the electrode assembly and / or the top cap assembly of the present application;

[0025] Figure 8 FIG. 7 is an assembled perspective view of the electrode assembly of the present application;

[0026] Figure 9 FIG. 8 is an exploded perspective view of the electrode assembly of the present application;

[0027] Figure 10 FIG. 9 is a sectional perspective view of the electrode assembly of the present application;

[0028] Figure 11 FIG. 10 is another sectional perspective view of the electrode assembly of the present application from another angle;

[0029] Figure 12 FIG. 11 is a front sectional view of the electrode assembly of the present application;

[0030] Figure 13 Figure 6

[0031] Figure 14 FIG. 15 is an assembled perspective view of the top cap assembly of the present application;

[0032] Figure 15 FIG. 16 is a sectional perspective view of the top cap assembly of the present application;

[0033] Figure 16 FIG. 17 is a front sectional view of the top cap assembly of the present application;

[0034] Figure 17 FIG. 18 is a front sectional view of an embodiment two of the electrode assembly and / or the top cap assembly of the present application;

[0035] Figure 18 FIG. 19 is a front sectional view of an embodiment three of the electrode assembly and / or the top cap assembly of the present application;

[0036] Figure 19 FIG. 20 is a front sectional view of another actual embodiment of the electrode assembly combined with the housing of the present application.

[0037] BRIEF DESCRIPTION OF THE DRAWINGS

[0038] ​​​​​Housing-10; cavity-11; mounting hole-12; opening-13; end wall-14; convex edge-141; inner groove-142; peripheral wall-15; battery cell assembly-40; battery cell unit-41; adapter plate-42; bracket-43; rupture disc-50; electrode assembly-20; top cover assembly-30; base plate-21; base body-211; inner ring groove-212; outer ring groove-213; first step-214; second step-215; first through hole-216; inner ring groove convex-217; pole-22; cylinder-221; lower limit-222; upper limit-223; anti-rotation notch-224; isolation pad-23; horizontal pad ring-231; inner edge lower extension-232; outer edge upper extension-233; second through hole-236; sealing ring-24; first sealing ring body-241; second sealing ring body-242; insulating piece-25; connecting body-251; isolation-252; insulating body-253; anti-rotation groove-254; anti-rotation convex-255; third through hole-256; edge buckle groove-218; steel pad-26; steel pad ring body-261; steel pad flange-262; welding area-S. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described clearly and completely below in combination with the specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, not all.

[0040] The present application is based on Figure 1 The X direction shown is the front direction in the front-back direction, the Y direction is the lateral direction, and the Z direction is the up-down direction.

[0041] Please refer to Figure 1 , Figure 2 , Figures 4 to 6 The secondary battery cell includes a housing 10 having a cavity 11 formed hollow in the front-back direction and an opening 13 formed open at one end, an electrode assembly 20 loaded into the cavity 11 from the opening 13, a battery cell assembly 40, and a top cover assembly 30 closing the opening 13.

[0042] The shell 10 includes an outer peripheral wall 15 formed by rotating a center axis along the X direction, the cavity 11 formed in the outer peripheral wall 15, the end wall 14 formed at the front end of the outer peripheral wall 15, the mounting hole 12 penetrating through the end wall 14, and the opening 13 formed at the rear end. The shell 10 is in one of a square structure, a circular structure, or a blade structure, and is made of any one of aluminum alloy, stainless steel, titanium alloy, and the like. In the square structure or the blade structure, an anti-explosion piece 50 is arranged on the side with a smaller area in the outer peripheral wall 15. The anti-explosion piece 50 can be formed on the side of the outer peripheral wall 15 by etching, such as laser ablation. The anti-explosion piece 50 can also be formed by stamping an anti-explosion notch, drilling an anti-explosion hole in the side of the outer peripheral wall 15, and then welding the stamped anti-explosion piece 50 to the anti-explosion hole.

[0043] The shell of the secondary battery cell has various forming methods, and different manufacturing processes can be used for different metal materials. If the shell is made of aluminum alloy, the aluminum alloy plate is preferably formed by stamping and stretching. If the shell is made of stainless steel, the thickness of the shell will be greatly reduced, and it is difficult to use the stretching process. At this time, the thin steel plate can be bent and spliced into a predetermined shape and then welded and sealed. The titanium alloy material can also be formed by splicing and welding.

[0044] The cell assembly 40 includes the cell unit 41 in the middle, the adapter piece 42 connected to the front and rear ends of the cell unit 41, and the bracket 43 supporting the front and rear ends of the cell unit 41. The electrode assembly 20 is electrically connected to the front end of the cell unit 41 through at least one adapter piece 42, and the top cover assembly 30 is electrically connected to the rear end of the cell unit 41 through at least one adapter piece 42. The bracket 43 is used to fix the cell unit 41 in the cavity 11 of the shell 10 to prevent the cell unit 41 from shaking.

[0045] Please continue to refer to Figure 7 As shown, the mounting hole 12 formed in the end wall 14 of the shell 10 is matched with the electrode assembly 20, the end wall 14 is recessed inward around the circumference of the mounting hole 12 to form an inner recess 142 around the mounting hole 12, and a raised edge 141 is formed outside the inner recess 142.

[0046] The electrode assembly 20 can be circular or racetrack-shaped, as shown in Figure 1 、 Figure 2 As shown, the electrode assembly 20 is in a racetrack-shaped structure, Figure 3The electrode assembly 20 is shown as a circular structure; the electrode assembly 20 can also be a square structure, etc., but the electrode assembly 20 of the present application can have various shapes, but the internal structure principle is basically the same. The electrode assembly 20 of the present application is the positive electrode of the secondary battery monomer, and the top cover assembly 30 is the negative electrode of the secondary battery monomer of the present application, but the electrode assembly 20 and the top cover assembly 30 can also be reversed as the negative electrode and the positive electrode.

[0047] Please continue to refer to Figures 8 to 12 The electrode assembly 20 is shown for ease of description, and the electrode assembly 20 of the present application is shown as a circular structure; the electrode assembly 20 can also be a square structure, etc., but the electrode assembly 20 of the present application can have various shapes, but the internal structure principle is basically the same. The electrode assembly 20 of the present application is the positive electrode of the secondary battery monomer, and the top cover assembly 30 is the negative electrode of the secondary battery monomer of the present application, but the electrode assembly 20 and the top cover assembly 30 can also be reversed as the negative electrode and the positive electrode. Figure 8 The L1 direction shown is defined as the radial direction, and the L2 direction is defined as the vertical direction. The electrode assembly 20 of the present application is assembled in the mounting hole 12 on the end wall 14 of the shell 10. The electrode assembly 20 includes a base plate 21 having a first through hole 216 formed therethrough, a pole 22 assembled in the first through hole 216, a sealing ring 24 crimped between the pole 22 and the base plate 21, a separation pad 23 separating the pole 22 and the base plate 21, and an insulating member 25.

[0048] Specifically, the base plate 21 includes a base portion 211, a first step portion 214, a second step portion 215, a first through hole 216 formed through the base portion 211, an outer ring groove 213 formed on the outer side of the base portion 211 around the first through hole 216, and an inner ring groove 212 formed on the inner side of the base portion 211 around the first through hole 216, which are sequentially arranged on the radial outer side of the outer end surface of the base portion 211 with the horizontal surface gradually decreasing. The inner diameter of the inner ring groove 212 is greater than the inner diameter of the outer ring groove 213, and the inner side surface of the first step portion 214 and the second step portion 215 is flush with the inner side surface of the base portion 211, that is, the thickness of the first step portion 214 is greater than the thickness of the second step portion 215, and the inner diameter of the inner ring groove 212 is limited within the outer diameter range of the base portion 211.

[0049] The insulating member 25 includes a connecting body 251 fitted on the radial inner wall surface of the inner ring groove 212, a separation portion 252 extending radially inwardly from the top of the connecting body 251, an insulating body 253 extending radially outwardly from the bottom of the connecting body 251 to cover the bottom surface of the base plate 21, and a third through hole 256 formed through the separation portion 252. The inner diameter of the third through hole 256 of the insulating member 25 is greater than the inner diameter of the first through hole 216 of the mounting hole base plate 21, and the separation portion 252 is fitted on the top surface of the inner ring groove 212.

[0050] The pole 22 comprises a pole body 221, a lower limiting portion 222 extending radially outward from the bottom of the pole body 221, and an upper limiting portion 223 folded radially outward from the top of the pole body 221. The middle portion of the pole body 221 protrudes outward beyond the surface of the upper limiting portion 223. The sealing ring 24 comprises a first sealing ring body 241 and a second sealing ring body 242 protruding upward from the inner side of the first sealing ring body 241, and the radial thickness of the second sealing ring body 242 is smaller than the vertical thickness of the first sealing ring body 241.

[0051] The isolation pad 23 is arranged on the outer ring groove 213 around the first through hole 216 of the substrate 21 to support and isolate the upper limiting portion 223. Specifically, the isolation pad 23 comprises a horizontal pad ring 231 adhering to the surface of the outer ring groove 213, an inner edge downward portion 232 extending downward from the inner side of the horizontal pad ring 231 to the inner wall surface of the first through hole 216, and an outer edge upward portion 233 extending upward from the outer side of the horizontal pad ring 231 along the edge of the outer ring groove 213.

[0052] Please refer to Figure 12As shown, when assembling the electrode assembly 20, the sealing ring 24 is first sleeved from top to bottom outside the column body 221 of the pole 22, and the first sealing ring body 241 of the sealing ring 24 is attached to the surface of the lower limiting portion 222, and the inner wall surface of the first sealing ring body 241 and the second sealing ring body 242 is attached to the outer surface of the column body 221; the insulating part 25 is installed in the inner ring groove 212 on the inner side of the base plate 21, at this time, the connecting body 251 and the top surface of the isolation portion 252 are attached to the inner surface of the inner ring groove 212, but the isolation portion 252 only covers the inner surface of the inner ring groove 212 on the radial outer side, and the insulating main body 253 covers a certain area of the lower surface of the base plate 21; it should be noted that before assembly, the upper limiting portion 223 is not outwardly folded, but is flush with the outer surface of the column body 221 or does not exceed the outer surface of the column body 221 on the radial outer side, in this step, the pole 22 which is not folded is inserted upward through the third through hole 256 and the first through hole 216, and the lower limiting portion 222 is received in the groove on the lower side of the isolation portion 252, that is, the lower limiting portion 222 and the insulating main body 253 at least partially overlap in the radial direction; the isolation pad 23 is sleeved from top to bottom outside the column body 221, specifically, the horizontal pad ring 231 of the isolation pad 23 is supported on the outer ring groove 213, and the inner edge lower extension portion 232 is attached to the outer surface of the column body 221 and extends downward into the first through hole 216 to isolate the column body 221 from the base plate 21; finally, the upper limiting portion 223 in the vertical state is outwardly folded by a tool to be pressed on the horizontal pad ring 231. After riveting is completed, the vertical thickness of the first sealing ring body 241 of the sealing ring 24 is thinned by extrusion and expanded on the radial outer side, finally, the outer edge of the first sealing ring body 241 will generate a certain extrusion force on the inner edge of the isolation portion 252 of the insulating part 25 to achieve complete sealing, and the second sealing ring body 242 is extruded downward by the inner edge lower extension portion 232 of the isolation pad 23 to achieve sealing. The upper limiting portion 223 is at least partially wrapped by the outer edge upper extension portion 233.

[0053] It should be noted that the electrode assembly of the present application Figure 8 、 Figure 9 is a racetrack-shaped structure, Figure 10 、 Figure 11 is a cross-sectional perspective view of a circular structure, and Figure 12 the cross-sectional view of the racetrack-shaped structure and the circular structure is the same. Because the racetrack-shaped structure has a straight edge on the outer periphery, there is no need to worry about the rotation of the internal components, while the circular electrode assembly needs to ensure that the internal components do not rotate.

[0054] Please refer to Figure 10 、 Figure 11As shown, when the electrode assembly 20 is circular, an anti-rotation structure is required. Specifically, the base body part 211 of the base plate 21 is protruded towards the inner side of the radial direction to form an inner ring groove protrusion 217 in the inner ring groove 212. The connecting part 251 of the insulating part 25 is recessed inward to form an anti-rotation recess 254 and an anti-rotation protrusion 255 protruding to the lower side of the isolation part 252 at the position corresponding to the inner ring groove protrusion 217. The outer periphery of the lower limiting part 222 of the pole column 22 is formed with an anti-rotation notch 224 on the anti-rotation protrusion 255. After assembly, the base plate 21 is buckled into the anti-rotation recess 254 of the insulating part 25 to prevent rotation of the two, and the anti-rotation protrusion 255 of the insulating part 25 is clamped into the anti-rotation notch 224 outside the lower limiting part 222 of the pole column 22 to prevent rotation of the two. In this way, the electrode assembly 20 can effectively prevent the insulating part 25 and the pole column 22 from rotating relative to the base plate 21.

[0055] The electrode assembly 20 of the present application is provided with an anti-rotation notch 224 on the outer periphery of the lower limiting part 222 of the pole column 22 to cooperate with the insulating part 25 and the base plate 21, thereby achieving stability among the three. Compared with the conventional anti-rotation structure of the pole column 22 provided on the outer surface of the column body 221, the integrity of the column body 221 can be achieved, the transmission and carrying capacity of the column body 221 can be avoided from being damaged, and the processing difficulty and complexity of the pole column 22 can be effectively reduced, thereby reducing the manufacturing cost.

[0056] Please continue to refer to Figures 13 to 16 As shown, the top cover assembly 30 is basically similar in structure to the electrode assembly 20, except that the base plate 21 of the top cover assembly 30 is wider in area to cover the opening 13 at one end of the shell 10, and the inner side of the outer edge of the base plate 21 is provided with an edge buckle groove 218 to be fitted on the outer peripheral wall 15 of the shell 10 to achieve welding fixation. The base plate 21 has some differences in structure, specifically, the design of the second step part 215 is cancelled, and the rest of the structure is basically the same.

[0057] The adapter plate 42 is welded to the bottom surface of the pole column 22 of the electrode assembly 20 and the top cover assembly 30.

[0058] Please continue to refer to Figure 17 、 Figure 18 As shown, the electrode assembly 20 and the top cover assembly 30 of the present application also include other embodiments. In order to ensure the gripping force of the upper limiting part 223 of the pole column 22, a steel pad 26 is clamped between the horizontal pad ring 231 of the isolation pad 23 and the upper limiting part 223. The steel pad 26 is a sheet structure (such as Figure 17As shown in the figure, the upper limiting portion 223 is pressed against the horizontal gasket ring 231 through the steel gasket 26, so as to avoid damaging the isolation gasket 23. The steel gasket 26 further comprises a horizontal steel gasket ring body 261 and a steel gasket flange 262 which is folded upward from the outer edge of the steel gasket ring body 261 (as shown in the figure). Figure 18 As shown in the figure, the presence of the steel gasket flange 262 can limit the pressing and folding range of the upper limiting portion 223 to the radial outside, so as to avoid damaging the outer edge upper extending portion 233 due to excessive pressing.

[0059] The shell 10, the electrode assembly 20 and the top cover assembly 30 are the battery shell assemblies of the present application, and the electrode assembly 20 and the top cover assembly 30 are only distinguished from each other in terms of the difference between the positive and negative electrodes. In actual implementation, the two can be unified as one, i.e., the top cover assembly or the electrode assembly.

[0060] Please continue to refer to Figures 1 to 18 As shown in the figure, the assembly method of the secondary battery cell of the present application will be described in detail below:

[0061] S10: The different adapter plates 42 are respectively welded and fixed to the pole columns 22 of the electrode assembly 20 and the top cover assembly 30; at the same time, the battery cell unit 41 is fixed to the bracket 43.

[0062] In this step, the adapter plates 42 are attached to the lower surface of the column body 221 of the pole column 22 and are welded together on one side of the adapter plates 42.

[0063] S20: The adapter plates 42 connected to the electrode assembly 20 and the top cover assembly 30 are electrically connected to the two poles of the battery cell unit 41 through the bracket 43; the electrode assembly 20 is fixed to the front end surface of one bracket 43, and the top cover assembly 30 is temporarily fixed to the rear end surface of another bracket 43, so that the electrode assembly 20, the top cover assembly 30 and the battery cell unit 41 become a combined body through the bracket 43.

[0064] S30: The combined body obtained in step S20 is pushed into the cavity 11 from the opening 13 at the rear end of the shell 10.

[0065] In this step, two of the supports 43 are respectively provided with fixing structures for fixing the electrode assembly 20 and the top cover assembly 30, and the fixing structures include buckle structures or glue bonding structures, etc. The longitudinal two ends of the battery cell unit 41 are respectively fixed by a pair of the supports 43. The electrode assembly 20, the top cover assembly 30 and the battery cell unit 41 become a relatively stable whole structure. After the above combination is pushed into the cavity 11, the electrode assembly 20 is correspondingly pushed to the mounting hole 12 of the end wall 14 at the front side of the shell 10. The shape structure of the support 43 corresponds to the shape of the cavity 11, so that the combination is kept in the predetermined position after being pushed in.

[0066] For emphasis Figure 17 As shown, the second step part 215 of the substrate 21 of the electrode assembly 20 is accommodated into the inner groove 142 of the end wall 14 and is attached and overlapped at the lower side of the convex edge 141. The bottom surface of the second step part 215 of the substrate 21 is flush with the inner wall surface of the end wall 14. The top surface of the first step part 214 is flush with the outer surface of the end wall 14, that is, the thickness of the first step part 214 is consistent with the thickness of the end wall 14, and the edge of the first step part 214 is close to the edge of the mounting hole 12. There is a certain gap between the edge of the second step part 215 and the edge of the inner groove 142.

[0067] For emphasis Figure 6 、 Figure 13 As shown, the substrate 21 of the top cover assembly 30 closes the opening 13 of the shell 10, and the edge buckle groove 218 is attached at the edge of the opening 13 of the shell 10 to limit the position.

[0068] S40: The substrate 21 of the electrode assembly 20 and the end wall 14 are welded and fixed together, and the substrate 21 of the top cover assembly 30 and the edge of the opening 13 of the shell 10 are welded and fixed together.

[0069] In this step, the electrode assembly 20 is irradiated by laser from the front side of the end wall 14 at the attachment position of the first step part 214 and the mounting hole 12, and a welding area S is formed by welding around to seal and fix the substrate 21 of the electrode assembly 20 and the end wall 14 as a whole.

[0070] During the laser irradiation, the second step part 215 can block the leaked laser, so that the laser cannot leak into the cavity 11 to damage the battery cell unit 41. At the same time, the attachment of the second step part 215 to the convex edge 141 also plays an initial positioning role.

[0071] In an embodiment, the convex edge 141 is provided with a groove structure on the upper end of the first step portion 214, and solder is added in the groove structure to increase the stability and operability of welding.

[0072] The welding of the top cover assembly 30 and the edge of the opening 13 is a prior art, please refer to the patent technology 202323075601.2 disclosed by the applicant, which will not be described here.

[0073] Compared with the prior art, the electrode assembly, the secondary battery cell and the manufacturing method thereof of the present application only need to open the mounting hole 12 on the end wall 14 by setting the opening 13 on one end of the shell 10 and the closed end wall 14 on the other end, so that the cell unit 41, the electrode assembly 20 and the top cover assembly 30 are first electrically connected through the adapter piece 42 and then inserted and assembled from one end of the shell 10, and finally the electrode assembly 20 and the top cover assembly 30 are welded to the mounting hole 12 and the opening 13, which simplifies the assembly difficulty and improves the processing efficiency.

[0074] The main point is that the electrode assembly 20 is attached from the inside to the outside of the end wall 14, and is welded by external laser irradiation, which simplifies the assembly process and takes into account the feasibility of laser welding. Compared with the prior art, both top cover assemblies 30 need to be externally mounted and welded, making the welding of the adapter piece 42 more simple and feasible.

[0075] In another embodiment, as shown in Figure 19 The end wall 14 is shown as being folded inward from the outer peripheral wall 15 of the shell by a little edge to support the electrode assembly 20 inserted from the inside to the outside, that is, the mounting hole 12 is a square hole or other larger shape hole and is adapted to the shape of the shell 10, that is, the shape of the electrode assembly 20 is closer to the shape of the top cover assembly 30. However, regardless of the manifestation, the focus of the present application is that the electrode assembly 20 is inserted from one side of the opening 13 end of the shell 10 to the mounting hole 12 at the other end opposite to the opening 13.

[0076] The present application also provides a power utilization equipment, which is an electric vehicle, an energy storage device, etc.

[0077] The technical features of the above embodiments can be combined in any way. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the present application.

[0078] The above examples only express the preferred embodiments of the present application, which are described in a more specific and detailed manner, but should not be understood as a limitation to the scope of the patent. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, which are all within the scope of protection of the present application. Therefore, the scope of protection of the present application patent should be subject to the appended claims.

Claims

1. A cap assembly, characterized by, Comprising a substrate including a base portion with a first through-hole formed therethrough; an isolation pad covering the base portion around the first through-hole, the isolation pad having a second through-hole formed therethrough coaxially with the first through-hole; an insulating member covering the lower side of the substrate and having a third through-hole formed therethrough corresponding to the first through-hole; a pole including a pole body, a lower limiting portion protruding radially outward from the lower end of the pole body, and an upper limiting portion protruding radially outward from the upper end of the pole body, the lower limiting portion abutting against the insulating member, and the upper limiting portion abutting against the isolation pad, the base portion around the first through-hole being clamped between the lower limiting portion and the upper limiting portion; a sealing ring clamped between the lower limiting portion and the base portion; wherein a steel pad is clamped between the upper limiting portion and the isolation pad.

2. The cap assembly of claim 1, wherein, Before the pole is assembled, the upper limiting portion of the pole is not folded outward, and the outer surface of the upper limiting portion does not protrude radially outward beyond the outer surface of the pole body, and after the pole is assembled, the vertical upper limiting portion is folded outward to press above the isolation pad to fix the pole on the substrate.

3. The cap assembly of claim 2, wherein, The steel pad is sleeved around the pole body before the upper limiting portion is folded.

4. The cap assembly of claim 3, wherein, The steel pad includes a steel pad ring clamped between the isolation pad and the upper limiting portion, and a steel pad flange folded upward from the outer periphery of the steel pad ring, the steel pad flange at least partially surrounding the radial outer edge of the upper limiting portion.

5. The cap assembly of claim 4, wherein, The base portion is recessed to form an inner ring groove and an outer ring groove on the inner and outer sides around the first through-hole, the isolation pad is limited in the outer ring groove, and the base portion protrudes to form an inner ring groove protrusion in the direction of the inner ring groove.

6. The cap assembly of claim 5, wherein, The isolation pad includes a horizontal pad ring at least partially accommodated in the outer ring groove, an outer edge upward extending portion extending upward from the outer edge of the horizontal pad ring, and an inner edge downward extending portion extending downward from the inner edge of the horizontal pad ring, the inner edge downward extending portion is clamped into the first through-hole, and the outer edge upward extending portion limits the steel pad flange inward.

7. The cap assembly of claim 6, wherein The lower end of the pole body is located on the inner side of the substrate, the upper end of the pole body is exposed on the outer side of the substrate, and the outer periphery of the lower limiting portion is provided with an anti-rotation notch.

8. The cap assembly of claim 7, wherein, The insulating member includes a connecting body limited in the inner ring groove, an insulating main body extending radially outward from the lower end of the connecting body, and an isolation portion extending radially inward from the connecting body, the connecting body is partially recessed to form an anti-rotation groove on the radially inward side and an anti-rotation protrusion protruding below the isolation portion on the other side of the anti-rotation groove, the inner ring groove protrusion of the base portion is clamped into the anti-rotation groove of the insulating member, the anti-rotation protrusion of the insulating member is clamped into the anti-rotation notch of the pole, and the lower limiting portion is limited within the range set by the connecting body and at least partially abuts against the lower side of the isolation portion.

9. The cap assembly of claim 8, wherein, The sealing ring comprises a first sealing ring body clamped between the lower limiting part and the inner ring groove surface, and a second sealing ring body extending upward from the inner edge of the first sealing ring body and clamped between the outer surface of the column and the hole wall of the first through hole, the second sealing ring body is also extruded and deformed by the inner edge lower extension part and the lower limiting part.

10. A secondary battery cell characterized by comprising: The top cover assembly comprises a top cover, a base plate and a sealing ring, the top cover comprises a top cover body and a top cover ring groove, the top cover ring groove is formed in the top cover body, the base plate is arranged on the top cover ring groove, the sealing ring is arranged on the top cover ring groove and the base plate, the top cover ring groove is provided with a first limiting part and a second limiting part, the first limiting part is arranged on the top cover body, the second limiting part is arranged on the base plate, the first limiting part and the second limiting part are arranged in the top cover ring groove, the first limiting part and the second limiting part are arranged in the top cover ring groove, the first limiting part and the second limiting part are arranged in the top cover ring groove, the first limiting part and the second limiting part are arranged in the top cover ring groove, the first limiting part and the second limiting part are arranged in the top cover ring groove, the first limiting part and the second limiting part are arranged in the top cover ring groove, the first limiting part and the second limiting part are arranged in the top cover ring groove, the first limiting part and the second limiting part are arranged in the top cover ring groove, the first limiting part and the second limiting part are arranged in the top cover ring groove, the first limiting part and the second limiting part are arranged in the top cover ring groove, the first limiting part and the second limiting part are arranged in the top cover ring groove, the first limiting part and the second limiting part are arranged in the top cover ring groove, the first limiting part and the second limiting part are arranged in the top

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