Method for manufacturing secondary battery cell and electric device

Abstract

A manufacturing method of a secondary battery monomer comprises the following steps: S10, providing a battery cell unit, a bracket, an adapter plate, an electrode assembly and a top cover assembly, enabling the adapter plate to penetrate through the bracket to electrically connect the electrode assembly with a first electrode of the battery cell unit, and enabling another adapter plate to electrically connect the top cover assembly with a second electrode of the battery cell unit; meanwhile, fixing the battery cell unit, the electrode assembly and the top cover assembly on the two brackets to obtain a combined body; s20, providing a shell, wherein the shell comprises a hollow peripheral wall with a cavity, an end wall at least partially closing the front end of the peripheral wall, and an opening formed by opening the rear end of the peripheral wall; a mounting hole is formed in the end wall, the assembly obtained in the step S10 is pushed into the cavity from the opening in the rear end of the shell, and the electrode assembly is limited to the inner side of the end wall and exposed to the front end of the shell through the mounting hole; and S30, laser welding equipment irradiates from the front end of the shell, so that the electrode assembly and the end wall are welded and fixed together, and the top cover assembly and the opening edge of the shell are welded and fixed together. The invention further discloses the electric equipment.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a method for manufacturing a secondary battery cell and an electrical device. Background Art

[0002] Secondary batteries refer to batteries that can be charged and discharged repeatedly. At present, secondary batteries are widely used in automobile power units and energy storage devices, which have led to major changes in the social energy structure and greatly reduced the carbon emissions of automobiles. Multiple secondary battery cells are combined into a battery pack to store electrical energy and release electrical energy to electrical devices. Secondary battery cells include various types, such as cylindrical, square, blade-shaped and other structures. Existing square batteries generally include a battery shell with openings at both ends and closed on other surfaces, a battery material installed in the battery shell, and a battery top cover that closes the openings at both ends of the battery shell. During assembly, the battery material needs to be first loaded into the space of the battery shell, and then the two battery top covers are used to close the openings at both ends of the battery shell. Before closing the openings at both ends of the battery shell, the battery material needs to be electrically connected to the pole on the battery top cover. In this process, the battery is loaded into the space inside the battery shell and then welded to the battery top cover. There are problems such as limited operating space and cumbersome process. It is necessary to optimize the product structure and introduce a more simplified and easy-to-operate assembly method.

[0003] At the same time, the battery top cover of traditional secondary batteries is usually fixed by fitting the battery shell from the outside of the open end of the battery shell to the outside of the battery shell and welding it to seal it. This structure limits the battery shell with two open ends to be unable to be welded and fixed to the battery cell before assembly. Only a certain welding space can be left to weld the adapter and then buckle it to the outside of the battery shell for sealing and welding. At the same time, part of the cylindrical pole will rotate. Traditionally, part of the circumferential surface is generally made into a straight surface shape to prevent rotation, but it will affect the current carrying capacity and strength of the product. Summary of the invention

[0004] In view of this, it is necessary to provide a method for manufacturing a secondary battery cell and an electrical device that is easy to assemble, stable and reliable.

[0005] In order to solve the above technical problems, the present application provides a method for manufacturing a secondary battery cell, comprising the following steps: S10: providing a battery cell unit, a bracket, an adapter sheet, an electrode assembly and a top cover assembly, using an adapter sheet to pass through the bracket to electrically connect the electrode assembly to the first pole of the battery cell unit, and using another adapter sheet to electrically connect the top cover assembly to the second pole of the battery cell unit; at the same time, fixing the battery cell unit, the electrode assembly and the top cover assembly on the two brackets to obtain a combination; S20: providing a shell, the shell comprising a hollow outer wall forming a cavity, an end wall at least partially closing the front end of the outer wall, and an opening formed by opening at the rear end of the outer wall; a mounting hole is opened on the end wall, and the combination obtained in step S10 is pushed into the cavity from the opening at the rear end of the shell, and the electrode assembly is limited to the inner side of the end wall and exposed to the front end of the shell through the mounting hole; S30: using laser welding equipment to irradiate from the front end of the shell to weld and fix the electrode assembly to the end wall, and weld and fix the top cover assembly to the edge of the opening of the shell.

[0006] Preferably, the bracket fixes the battery cell unit, the electrode assembly and the top cover assembly by means of a slot structure or bonding.

[0007] Preferably, the electrode assembly comprises a substrate having a first through hole formed therethrough and a pole installed in the first through hole, and the substrate of the electrode assembly is confined to the inner side of the end wall and is welded and fixed to the end wall.

[0008] Preferably, the inner surface of the end wall located at the edge of the mounting hole is recessed to form an inner groove and a convex edge, and the outer surface of the substrate of the electrode assembly is sequentially provided with a first step portion and a second step portion along the radial direction outward, the second step portion fits in the inner groove of the end wall and fits on the inner side of the convex edge, the first step portion and the outer surface of the end wall are on the same horizontal plane and the outer edge of the first step portion is attached to the inner edge of the convex edge, and the laser welding equipment irradiates the junction of the first step portion and the convex edge from the front of the outer shell to weld and fix them.

[0009] Preferably, the lower surface of the substrate is flush with the inner surface of the end wall, and the second step portion blocks the leaked laser from entering the cavity of the housing.

[0010] Preferably, laser equipment is used to irradiate and melt the joint between the flange and the second step portion, so that they are combined and sealed together; or a groove structure is provided between the flange and the outer edge of the first step portion, and the groove structure is filled with solder, and the flange and the outer edge of the first step portion are connected and sealed by melting the solder.

[0011] Preferably, the substrate includes a base portion, the first through hole penetrates the base portion, and the base portion serves as a first step portion or an outer surface of the base portion is higher than a surface of the first step portion.

[0012] Preferably, the base portion is located on the inner and outer sides of the periphery of the first through hole and is respectively provided with an inner ring groove and an outer ring groove, the inner diameter of the inner ring groove is larger than the inner diameter of the outer ring groove, the electrode assembly also includes an isolation pad limited in the outer ring groove and an insulating member limited in the inner ring groove, the pole includes a column, a lower limit portion formed by radially protruding outward from the lower end of the column and limited below the insulating member and the inner ring groove, an upper limit portion folded outward from the upper end of the column and pressed between the isolation pad and the upper part of the outer ring groove, and a sealing ring pressed between the lower limit portion and the surface of the inner ring groove.

[0013] Preferably, the insulating part includes a vertically extending connector, an isolating portion extending radially inward from the upper end of the connector, a third through hole formed through the isolating portion, and an insulating body extending radially outward from the lower end of the connector, the connector and the isolating portion are confined within the inner annular groove, the isolating portion and the connector isolate the substrate from the pole, the insulating body covers the lower surface of the substrate, and the lower limit portion is confined within the connector.

[0014] Preferably, the isolation gasket includes a horizontal gasket supported on the surface of the outer ring groove, a second through hole formed through the horizontal gasket, an outer edge upper extension portion extending upward from the outer edge of the horizontal gasket, and an inner edge lower extension portion extending downward from the inner edge of the horizontal gasket, the upper limit portion of the pole is crimped onto the top of the horizontal gasket and is limited within the range of the outer edge upper extension portion, the inner edge lower extension portion extends along the hole wall of the first through hole, and the sealing ring includes a first sealing ring body crimped between the inner ring groove and the lower limit portion, and a second sealing ring body crimped between the lower limit portion and the inner edge lower extension portion.

[0015] Preferably, the top cover assembly includes a base plate and a pole assembled on the base plate, an edge buckle groove is formed on the inner outer edge of the base plate, and the edge buckle groove is snapped onto the outer peripheral wall of the shell and welded together by laser welding equipment.

[0016] In order to solve the above technical problems, the present application also provides an electrical device, comprising a plurality of secondary battery cells manufactured by the above method.

[0017] Compared with the prior art, the manufacturing method of the secondary battery cell of the present application, by only setting an opening at one end of the outer shell and a closed end wall at the other end, only needs to open a mounting hole on the end wall, so that the battery cell unit, electrode assembly, and top cover assembly are electrically connected first and then inserted into the opening at one end of the outer shell for assembly, and finally the electrode assembly and top cover assembly are respectively welded to the mounting hole and the opening, which simplifies the difficulty of assembly and improves processing efficiency.

[0018] The main point is to fit the electrode assembly onto the end wall from the inside out and weld it from the outside by laser irradiation, which simplifies the assembly process and takes into account the feasibility of laser welding. Compared with the prior art where both top cover assemblies need to be installed and welded from the outside, the welding of the adapter is simpler and more feasible. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1 A three-dimensional assembly diagram of a secondary battery cell of the present application;

[0021] Figure 2 A three-dimensional combination diagram of a secondary battery cell of the present application from another angle;

[0022] Figure 3 A three-dimensional combination diagram of another form of a secondary battery cell of the present application;

[0023] Figure 4 This is a three-dimensional exploded view of a secondary battery cell of the present application;

[0024] Figure 5 This is a three-dimensional exploded view of the secondary battery cell of the present application from another angle;

[0025] Figure 6 For this application, the secondary battery monomer Figure 1 A cross-sectional view taken along the dashed line AA shown;

[0026] Figure 7 for Figure 6 A partial enlarged view of the dotted circle A shown;

[0027] Figures 8 to 16 Embodiment 1 of the electrode assembly and / or the top cover assembly

[0028] Figure 8 A three-dimensional assembly diagram of the electrode assembly of the present application;

[0029] Fig. 9 This is a three-dimensional exploded view of the electrode assembly of the present application;

[0030] Fig.10 A three-dimensional cross-sectional view of the electrode assembly of the present application;

[0031] Fig.11 A three-dimensional cross-sectional view of the electrode assembly of the present application from another angle;

[0032] Fig.12 This is a front cross-sectional view of the electrode assembly of the present application;

[0033] Fig.13 for Figure 6 A partial enlarged view of the dotted circle B shown;

[0034] Fig.14 A three-dimensional assembly diagram of the top cover assembly of this application;

[0035] Fig.15 A three-dimensional cross-sectional view of the top cover assembly of the present application;

[0036] Fig.16 A front cross-sectional view of the top cover assembly of the present application;

[0037] Fig.17 A front cross-sectional view of the second embodiment of the electrode assembly and / or top cover assembly of the present application;

[0038] Fig.18 A front cross-sectional view of Embodiment 3 of the electrode assembly and / or top cover assembly of the present application;

[0039] Fig.19 This is a front cross-sectional view of another embodiment of combining the electrode assembly and the casing of the present application.

[0040] Description of Reference Numerals

[0041] Shell-10; cavity-11; mounting hole-12; opening-13; end wall-14; convex edge-141; inner groove-142; outer peripheral wall-15; battery cell assembly-40; battery cell unit-41; adapter sheet-42; bracket-43; explosion-proof sheet-50; electrode assembly-20; top cover assembly-30; substrate-21; base part-211; inner ring groove-212; outer ring groove-213; first step part-214; second step part-215; first through hole-216; inner ring groove convex part-217; pole-22; column-221; lower limit part- 222; upper limit portion-223; anti-rotation notch-224; isolation pad-23; horizontal gasket 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 member-25; connecting body-251; isolation portion-252; insulating body-253; anti-rotation groove-254; anti-rotation protrusion-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

[0042] In order to make the purpose, technical solution and advantages of this application clearer, the technical solution of this application will be clearly and completely described below in combination with the specific embodiments of this application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of this application, not all of them.

[0043] This application is Figure 1 The X direction is the front of the front-back direction, the Y direction is the lateral direction, and the Z direction is the up-down direction.

[0044] See also Figure 1 , Figure 2 , Figures 4 to 6 As shown, the secondary battery cell of the present application includes a housing 10 which is hollow in the front-to-back direction to form a cavity 11 and is open at one end to form an opening 13, an electrode assembly 20 inserted into the cavity 11 through the opening 13, a battery cell assembly 40 and a top cover assembly 30 that closes the opening 13.

[0045] The housing 10 includes an outer peripheral wall 15 formed by rotating one circle along the axis center of the X direction, the cavity 11 formed in the outer peripheral wall 15, an end wall 14 formed at the front end of the outer peripheral wall 15, a mounting hole 12 penetrating the end wall 14, and the opening 13 formed by opening at the rear end. The housing 10 is a square structure, a circular structure or a blade structure, and the material includes any one of aluminum alloy, stainless steel, titanium alloy and the like. On the square structure or the blade structure, an explosion-proof plate 50 is provided on a side surface of the outer peripheral wall 15 with a smaller area. The explosion-proof plate 50 can be formed on the side surface of the outer peripheral wall 15 by etching, and the etching method includes laser ablation, etc.; the explosion-proof plate 50 can also be separately punched to form an explosion-proof notch, and an explosion-proof hole is opened on the side surface of the outer peripheral wall 15, and then the punched explosion-proof plate 50 is welded to the explosion-proof hole.

[0046] The shell of the secondary battery cell of the present application can be formed in a variety of ways, and different manufacturing processes can be used for different metal materials. If the shell is made of aluminum alloy, it is preferably formed by stamping and stretching an aluminum alloy sheet; if the shell is made of stainless steel, the thickness of the shell will be greatly reduced, and it will be difficult to use a stretching process. At this time, the thin steel plates can be bent and spliced ​​into a predetermined shape and then welded and sealed; and titanium alloy materials can also be formed by welding.

[0047] The battery cell assembly 40 includes a battery cell unit 41 located in the middle, adapters 42 connected to the battery cell unit 41 at the front and rear ends respectively, and brackets 43 supported at the front and rear ends of the battery cell unit 41. The electrode assembly 20 is electrically connected to the front end of the battery cell unit 41 through at least one adapter 42, and the top cover assembly 30 is electrically connected to the rear end of the battery cell unit 41 through at least one adapter 42. The bracket 43 is used to fix the battery cell unit 41 in the cavity 11 of the housing 10 to prevent the battery cell unit 41 from shaking.

[0048] Please continue reading Figure 7 As shown, the mounting hole 12 opened on the end wall 14 of the shell 10 is adapted to the electrode assembly 20 , and the end wall 14 is recessed on the inner side of the periphery of the mounting hole 12 to form an inner groove 142 surrounding the mounting hole 12 , and a convex edge 141 is formed on the outer side of the inner groove 142 .

[0049] The electrode assembly 20 may be circular or racetrack shaped, such as Figure 1 , Figure 2 The runway-shaped structure is shown. Figure 3The structure shown is a circular structure; the electrode assembly 20 can also be a square structure, but the electrode assembly 20 of the present application can be in a variety of shapes and structures, but the internal structure principle is basically the same. The electrode assembly 20 of the present application is used as the positive electrode of the secondary battery cell, and the top cover assembly 30 is used as the negative electrode of the secondary battery cell of the present application, but the electrode assembly 20 and the top cover assembly 30 can also be used as the negative electrode and the positive electrode in reverse.

[0050] Please continue reading Figures 8 to 12 As shown, for ease of description, the electrode assembly 20 of the present application is Figure 8 The L1 direction shown is defined as the radial direction, and the L2 direction is defined as vertically upward. The electrode assembly 20 of the present application is assembled in the mounting hole 12 on the end wall 14 of the housing 10. The electrode assembly 20 includes a substrate 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 substrate 21, an isolation pad 23 isolating the pole 22 from the substrate 21, and an insulating member 25.

[0051] Specifically, the base plate 21 includes a base portion 211, a first step portion 214 and a second step portion 215 which are arranged in sequence along the radial outer side from the outer end surface of the base portion 211, the first through hole 216 penetrating the base portion 211, an outer annular groove 213 formed on the outer side of the base portion 211 at the periphery of the first through hole 216, and an inner annular groove 212 formed on the inner side of the base portion 211 at the periphery of the first through hole 216. The inner diameter of the inner annular groove 212 is greater than the inner diameter of the outer annular groove 213, the inner side surface where the first step portion 214 and the second step portion 215 are located 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 annular groove 212 is limited to the outer diameter range of the base portion 211.

[0052] The insulating member 25 includes a connector 251 attached to the radial inner wall surface of the inner annular groove 212, an isolating portion 252 extending from the top of the connector 251 along the radial inner side, an insulating body 253 extending from the bottom of the connector 251 along the radial outer side to cover the bottom surface of the substrate 21, and a third through hole 256 formed through the isolating 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 substrate 21, and the isolating portion 252 is attached to the top surface of the inner annular groove 212.

[0053] The pole 22 includes a column 221, a lower limit portion 222 extending radially outward from the bottom of the column 221, and an upper limit portion 223 folded radially outward from the top of the column 221. The middle part of the column 221 protrudes outward from the surface of the upper limit portion 223. The sealing ring 24 includes 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 less than the vertical thickness of the first sealing ring body 241.

[0054] The isolation pad 23 is installed on the outer ring groove 213 at the periphery of the first through hole 216 of the substrate 21 to support and isolate the upper limit portion 223. Specifically, the isolation pad 23 includes a horizontal pad ring 231 attached to the surface of the outer ring groove 213, an inner edge lower extension 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 upper extension portion 233 extending upward from the outer side of the horizontal pad ring 231 along the edge of the outer ring groove 213.

[0055] Please refer to Fig.12As shown, when assembling the electrode assembly 20, the sealing ring 24 is first inserted from top to bottom into the outside of the column 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 limit portion 222, and the inner wall surfaces of the first sealing ring body 241 and the second sealing ring body 242 are attached to the outer surface of the column 221; the insulating member 25 is installed on the inner ring groove 212 on the inner side of the substrate 21, at this time, the top surfaces of the connecting body 251 and the isolating portion 252 are attached to the inner surface of the inner ring groove 212, but the isolating portion 252 only covers the inner surface of the inner ring groove 212 close to the radial outer side, and the insulating body 253 covers a certain area of ​​the lower surface of the substrate 21; it should be noted that before the pole 22 is assembled, the upper limit portion 223 is not folded outward, but is in contact with the The outer surface of the column 221 is kept flush or does not extend radially outward from the outer surface of the column 221. In this step, the unfolded pole 22 is passed upward through the third through hole 256 and the first through hole 216, and the lower limit portion 222 is accommodated in the groove on the lower side of the isolation portion 252, that is, the lower limit portion 222 overlaps with the insulating body 253 at least in the radial direction. The projection portion; the isolation pad 23 is inserted into the outside of the column 221 from top to bottom. Specifically, the horizontal gasket 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 221 and extends downward into the first through hole 216 to isolate the column 221 from the substrate 21; finally, the upper limit portion 223 in a vertical state is folded outward by a tool to be pressed on the horizontal gasket ring 231. After the riveting is completed, the vertical thickness of the first sealing ring body 241 of the sealing ring 24 is squeezed and thinned and expanded radially outward, and finally, the outer edge of the first sealing ring body 241 will generate a certain squeezing force on the inner edge of the isolation portion 252 of the insulating member 25 to achieve complete sealing, and the second sealing ring body 242 is squeezed downward by the inner edge lower extension portion 232 of the isolation pad 23 to achieve sealing. The upper limit portion 223 is at least partially wrapped by the outer edge upper extension portion 233.

[0056] It should be noted that the electrode assembly of this application Figure 8 , Fig. 9 The runway-shaped structure is shown. Fig.10 , Fig.11 is a cross-sectional stereogram of a circular structure, and Fig.12 The cross-sectional view of the racetrack-shaped structure is the same as the cross-sectional view of the circular structure. Because the racetrack-shaped structure has straight edges on its periphery, there is no need to worry about the rotation of its internal components, while the circular electrode assembly needs to ensure that its internal components do not rotate.

[0057] Please refer to the following Fig.10 , Fig.11As shown, when it is a circular electrode assembly 20, an anti-rotation structure needs to be provided, specifically, the base portion 211 of the substrate 21 protrudes radially inward to form an inner ring groove convex portion 217 located in the inner ring groove 212, the connecting portion 251 of the insulating member 25 corresponding to the position of the inner ring groove convex portion 217 is recessed inward to form an anti-rotation groove 254 and an anti-rotation convex portion 255 protruding to the lower side of the isolation portion 252, and an anti-rotation notch 224 is formed on the outer periphery of the lower limit portion 222 of the pole 22 corresponding to the anti-rotation convex portion 255. After assembly, the substrate 21 is buckled into the anti-rotation groove 254 of the insulating component 25 through the inner ring groove protrusion 217 to prevent the two from rotating, and the anti-rotation protrusion 255 of the insulating component 25 is inserted into the anti-rotation notch 224 outside the lower limit portion 222 of the pole 22 to prevent the two from rotating. In this way, the electrode assembly 20 can effectively prevent the insulating component 25 and the pole 22 therein from rotating relative to the substrate 21.

[0058] The electrode assembly 20 of the present application is provided with an anti-rotation notch 224 on the outer periphery of the lower limit portion 222 of the pole 22 to cooperate with the insulating member 25 and the substrate 21 to achieve stability among the three. Compared with the traditional method of providing the anti-rotation structure of the pole 22 on the outer surface of the column 221, the integrity of the column 221 can be achieved to avoid damaging its transmission carrying capacity. At the same time, the processing difficulty and complexity of the pole 22 can be effectively reduced, thereby reducing the manufacturing cost.

[0059] Please continue reading Figures 13 to 16 As shown, the structure of the top cover assembly 30 is basically similar to that of the electrode assembly 20, except that the substrate 21 of the top cover assembly 30 is wider and needs to cover the opening 13 at one end of the housing 10, and an edge buckle groove 218 is provided on the inner side of the outer edge of the substrate 21 to fit on the outer peripheral wall 15 of the housing 10 for welding and fixing. There are some differences in the structure of the substrate 21, specifically: the design of the second step portion 215 is cancelled, and the rest of the structure is basically the same.

[0060] The adapter sheet 42 is welded to the bottom surfaces of the electrode assembly 20 and the pole 22 of the top cover assembly 30 .

[0061] Please continue reading Fig.17 , Fig.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 limit portion 223 of the pole 22, a steel pad 26 is clamped between the horizontal gasket ring 231 of the isolation pad 23 and the upper limit portion 223. The steel pad 26 is a thin sheet structure (such as Fig.17The steel pad 26 is used to disperse the squeezing force of the upper limit portion 223 on the horizontal pad ring 231 to avoid damaging the isolation pad 23. The steel pad 26 also includes a horizontal steel pad ring body 261 and a steel pad flange 262 (as shown in FIG. 1 ) formed by folding upward from the outer edge of the steel pad ring body 261. Fig.18 As shown in the figure, the existence of the steel pad flange 262 can limit the radially outward rolling range of the upper limit portion 223 when it is extruded and folded, thereby avoiding damage to the outer edge extension portion 233 caused by excessive extrusion.

[0062] Please continue reading Figures 1 to 18 As shown, the assembly method of the secondary battery cell of the present application will be described in detail below:

[0063] S10: Weld different adapters 42 to the poles 22 of the electrode assembly 20 and the top cover assembly 30 respectively; at the same time, fix the battery cell unit 41 to the bracket 43; pass the adapter 42 connected to the electrode assembly 20 and the top cover assembly 30 through the bracket 43 to electrically connect the two poles of the battery cell unit 41; the electrode assembly 20 is fixed to the front end face of one bracket 43, and the top cover assembly 30 is temporarily fixed to the rear end face of the other bracket 43, so that the electrode assembly 20, the top cover assembly 30 and the battery cell unit 41 become a combination through the bracket 43.

[0064] In this step, the adapter plate 42 is attached to the lower surface of the column 221 of the pole 22 and fixed together by welding on one side of the adapter plate 42 .

[0065] S20: Pushing the assembly obtained in step S10 into the cavity 11 through the opening 13 at the rear end of the housing 10;

[0066] In this step, the two brackets 43 are respectively provided with fixing structures for fixing the electrode assembly 20 and the top cover assembly 30, and the fixing structures include snap-fit ​​structures or glue bonding structures, etc., and the longitudinal ends of the battery cell unit 41 are respectively fixed by a pair of brackets 43. The electrode assembly 20, the top cover assembly 30 and the battery cell unit 41 form a relatively stable integral structure. After the above-mentioned combination is pushed into the cavity 11, the electrode assembly 20 is correspondingly pushed to the mounting hole 12 of the end wall 14 on the front side of the shell 10, and the outer shape structure of the bracket 43 corresponds to the shape of the cavity 11, so that the combination is kept in a predetermined position after being pushed in.

[0067] Key References Fig.17As shown, the second step portion 215 of the substrate 21 of the electrode assembly 20 is received in the inner groove 142 of the end wall 14 and overlapped with the lower side of the convex edge 141, the bottom surface of the second step portion 215 of the substrate 21 is flush with the inner wall surface of the end wall 14, and the top surface of the first step portion 214 is flush with the outer surface of the end wall 14, that is, the thickness of the first step portion 214 is consistent with the thickness of the end wall 14, and the edge of the first step portion 214 is closely attached to the edge of the mounting hole 12. There is a certain gap between the edge of the second step portion 215 and the edge of the inner groove 142.

[0068] Key References Figure 6 , Fig.13 As shown, the base plate 21 of the top cover assembly 30 closes the opening 13 of the housing 10 , and the edge buckle groove 218 fits the edge of the opening 13 of the housing 10 for positioning.

[0069] S30: welding and fixing the substrate 21 of the electrode assembly 20 to the end wall 14, and welding and fixing the substrate 21 of the top cover assembly 30 to the edge of the opening 13 of the housing 10;

[0070] In this step, the electrode assembly 20 is irradiated with a laser from the front side of the end wall 14 at the joint between the first step portion 214 and the mounting hole 12, and a welding circle is formed to form a welding area S so that the substrate 21 of the electrode assembly 20 and the end wall 14 are sealed and fixed as a whole.

[0071] During laser irradiation, the second step portion 215 can block leaked laser light, so that the laser light will not leak into the cavity 11 and damage the battery cell 41. Meanwhile, the second step portion 215 abuts against the convex edge 141 and also plays a role in initial positioning.

[0072] In one embodiment, a groove structure is formed between the convex edge 141 and the upper end of the first step portion 214 , and solder is added into the groove structure to increase the stability and operability of welding.

[0073] The welding of the top cover assembly 30 and the edge of the opening 13 is prior art. For details, please refer to the applicant's disclosed patent technology 202323075601.2, which will not be repeated here.

[0074] Compared with the prior art, the electrode assembly, secondary battery cell and manufacturing method thereof of the present application, by only setting an opening 13 at one end of the outer shell 10 and a closed end wall 14 at the other end, only a mounting hole 12 needs to be opened on the end wall 14, so that the battery cell unit 41, electrode assembly 20 and top cover assembly 30 are first electrically connected through the adapter 42 and then inserted into and assembled from one end of the outer shell 10, and finally the electrode assembly 20 and top cover assembly 30 are respectively welded to the mounting hole 12 and the opening 13, which simplifies the difficulty of assembly and improves processing efficiency.

[0075] The main point is to fit the electrode assembly 20 onto the end wall 14 from the inside out and weld it from the outside by laser irradiation, which simplifies the assembly process and takes into account the feasibility of laser welding. Compared with the prior art where both top cover assemblies 30 need to be installed and welded from the outside, the welding of the adapter 42 is simpler and more feasible.

[0076] In another embodiment, if Fig.19 As shown, the end wall 14 is formed by folding a little edge inward from the outer peripheral wall 15 of the shell to support the electrode assembly 20 loaded from the inside out, that is, the mounting hole 12 is a square hole or other large 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, no matter what form is used, 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.

[0077] The present application also provides an electrical device, which is an electric car, an energy storage device, etc.

[0078] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for manufacturing a secondary battery cell, characterized in that: The steps include: S10: providing a battery cell unit, a bracket, an adapter sheet, an electrode assembly and a top cover assembly, using an adapter sheet to pass through the bracket to electrically connect the electrode assembly to a first pole of the battery cell unit, and using another adapter sheet to electrically connect the top cover assembly to a second pole of the battery cell unit; and fixing the battery cell unit, the electrode assembly and the top cover assembly on the two brackets to obtain a combined body; S20: providing a shell, the shell comprising a hollow outer wall forming a cavity, an end wall at least partially closing the front end of the outer wall, and an opening formed at the rear end of the outer wall; a mounting hole is provided on the end wall, the assembly obtained in step S10 is pushed into the cavity from the opening at the rear end of the shell, and the electrode assembly is confined inside the end wall and exposed to the front end of the shell through the mounting hole; S30: Using laser welding equipment to irradiate from the front end of the shell, the electrode assembly is welded and fixed to the end wall, and the top cover assembly is welded and fixed to the opening edge of the shell.

2. The method for manufacturing a secondary battery cell according to claim 1, wherein: The bracket fixes the battery cell unit, the electrode assembly, and the top cover assembly by means of a slot structure or bonding.

3. The method for manufacturing a secondary battery cell according to claim 1, wherein: The electrode assembly includes a substrate having a first through hole formed therethrough and a pole installed in the first through hole. The substrate of the electrode assembly is limited to the inner side of the end wall and is welded and fixed to the end wall.

4. The method for manufacturing a secondary battery cell according to claim 3, wherein: The inner surface of the end wall located at the edge of the mounting hole is recessed to form an inner groove and a convex edge. The outer surface of the substrate of the electrode assembly is sequentially provided with a first step portion and a second step portion along the radial direction outward. The second step portion fits in the inner groove of the end wall and fits on the inner side of the convex edge. The first step portion and the outer surface of the end wall are on the same horizontal plane and the outer edge of the first step portion is attached to the inner edge of the convex edge. The laser welding equipment irradiates the junction of the first step portion and the convex edge from the front of the outer shell to weld and fix them.

5. The method for manufacturing a secondary battery cell according to claim 4, wherein: The lower surface of the substrate is flush with the inner surface of the end wall, and the second step portion blocks the leaked laser from entering the cavity of the housing.

6. The method for manufacturing a secondary battery cell according to claim 5, wherein: Laser equipment is used to melt the joint between the flange and the second step portion, so that they are combined and sealed together; or a groove structure is provided between the flange and the outer edge of the first step portion, and the groove structure is filled with solder, and the flange and the outer edge of the first step portion are connected and sealed by melting the solder.

7. The method for manufacturing a secondary battery cell according to claim 4, wherein: The substrate includes a base portion, the first through hole penetrates the base portion, and the base portion serves as a first step portion or an outer surface of the base portion is higher than a surface of the first step portion.

8. The method for manufacturing a secondary battery cell according to claim 7, wherein: The base portion is located at the inner and outer sides of the periphery of the first through hole and is respectively provided with an inner ring groove and an outer ring groove, the inner diameter of the inner ring groove is larger than the inner diameter of the outer ring groove, the electrode assembly also includes an isolation pad limited in the outer ring groove and an insulating member limited in the inner ring groove, the pole includes a column, a lower limit portion formed by radially protruding outward from the lower end of the column and limited below the insulating member and the inner ring groove, an upper limit portion folded outward from the upper end of the column and pressed against the isolation pad and above the outer ring groove, and a sealing ring pressed between the lower limit portion and the surface of the inner ring groove.

9. The method for manufacturing a secondary battery cell according to claim 8, wherein: The insulating member includes a vertically extending connector, an isolating portion extending radially inward from the upper end of the connector, a third through hole formed through the isolating portion, and an insulating body extending radially outward from the lower end of the connector, the connector and the isolating portion are confined within the inner annular groove, the isolating portion and the connector isolate the substrate from the pole, the insulating body covers the lower surface of the substrate, and the lower limit portion is confined within the connector.

10. The method for manufacturing a secondary battery cell according to claim 9, wherein: The isolation gasket includes a horizontal gasket supported on the surface of the outer ring groove, a second through hole formed by penetrating the horizontal gasket, an outer edge upper extension portion extending upward from the outer edge of the horizontal gasket, and an inner edge lower extension portion extending downward from the inner edge of the horizontal gasket, the upper limit portion of the pole is crimped onto the top of the horizontal gasket and is limited within the range of the outer edge upper extension portion, the inner edge lower extension portion extends along the hole wall of the first through hole, and the sealing ring includes a first sealing ring body crimped between the inner ring groove and the lower limit portion, and a second sealing ring body crimped between the lower limit portion and the inner edge lower extension portion.

11. The method for manufacturing a secondary battery cell according to claim 1, wherein: The top cover assembly includes a base plate and a pole assembled on the base plate. An edge buckle groove is formed on the inner outer edge of the base plate. The edge buckle groove is buckled on the outer peripheral wall of the shell and welded together by laser welding equipment.

12. An electrical equipment, characterized in that: The invention comprises a plurality of secondary battery cells manufactured by the manufacturing method according to any one of claims 1 to 11.

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