Electrode assembly and battery case assembly

Abstract

An electrode assembly includes a substrate including a base portion having a first through hole formed therethrough; 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 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; wherein the base body part of the substrate is sequentially provided with a first step part and a second step part from inside to outside, and the surface of the second step part is lower than the surface of the first step part. The utility model further discloses a battery shell assembly.

Description

Technical Field

[0001] This application relates to the field of batteries, and more particularly to an electrode assembly and a battery casing assembly. Background Technology

[0002] Rechargeable batteries are batteries that can be recharged and discharged multiple times. Currently, they are widely used in automotive power systems and energy storage devices, significantly changing the social energy structure and greatly reducing carbon emissions from automobiles. Multiple rechargeable battery cells are combined into a battery pack to store electrical energy and release it to electrical devices. Rechargeable battery cells come in various types, such as cylindrical, square, and blade-shaped structures. Existing square batteries generally include a battery casing with open ends and closed sides, battery cells installed inside the casing, and a top cover sealing the two ends of the casing. During assembly, the battery cells must first be installed into the space of the battery casing, and then the two top covers must be used to seal the two ends of the casing. Before sealing the two ends of the casing, the battery cells need to be electrically connected to the terminals on the top covers. This process, involving installing the cells into the battery casing and then welding them to the top covers, presents problems of limited operational space and cumbersome procedures. It is necessary to optimize the product structure and introduce a simpler and easier-to-operate assembly method.

[0003] Meanwhile, in traditional secondary batteries, the battery top cover is typically attached to the outside of the battery casing from the open end and then welded to seal it. This structure limits the ability of the battery casing with open ends to be welded to the battery cell before assembly; only a certain welding space is left to weld the adapter piece before it is snapped onto the outside of the battery casing for sealing. Additionally, some cylindrical terminals may rotate. Traditionally, this is prevented by making part of the circumference a straight surface, but this affects the product's current carrying capacity and strength. Utility Model Content

[0004] Therefore, it is necessary to provide an electrode assembly and a housing assembly that can be assembled and welded to the housing from the inside.

[0005] To address the aforementioned technical problems, this application provides an electrode assembly, including a substrate. The substrate includes a base portion having a first through-hole formed therethrough; an insulating pad covering the base portion around the first through-hole, the insulating pad having a second through-hole coaxial with the first through-hole; an insulating member covering the lower side of the substrate and having a third through-hole corresponding to the first through-hole; an electrode post including a post body, a lower limiting portion protruding radially outward from the lower end of the post body, and an upper limiting portion protruding radially outward from the upper end of the post body, the lower limiting portion abutting against the insulating member, and the upper limiting portion abutting against the insulating pad; the base portion around the first through-hole is sandwiched between the lower limiting portion and the upper limiting portion; a sealing ring sandwiched between the lower limiting portion and the base portion; wherein, the base portion of the substrate has a first stepped portion and a second stepped portion sequentially from the inside out, the surface of the second stepped portion being lower than the surface of the first stepped portion.

[0006] Preferably, the upper surface of the base portion serves as the first stepped portion, or the upper surface of the first stepped portion is lower than the upper surface of the base portion.

[0007] Preferably, the base portion is provided with an inner ring groove and an outer ring groove on the inner and outer sides of the periphery of the first through hole, respectively. The inner diameter of the inner ring groove is larger than the inner diameter of the outer ring groove. The insulating pad is limited to the outer ring groove, and the insulating component is limited to the inner ring groove.

[0008] Preferably, the insulating member includes a vertically extending connector, an isolation portion extending radially inward from the upper end of the connector, a third through hole forming through the isolation portion, and an insulating body extending radially outward from the lower end of the connector. The connector and the isolation portion are confined within the inner annular groove. The isolation portion and the connector isolate the substrate from the pole post. The insulating body covers the lower surface of the substrate, and the lower limiting portion is confined within the connector.

[0009] Preferably, the isolation pad includes a horizontal washer ring supported on the surface of the outer ring groove, a second through hole formed through the horizontal washer ring, an upper outer edge extension extending upward from the outer edge of the horizontal washer ring, and a lower inner edge extension extending downward from the inner edge of the horizontal washer ring. The upper limit portion of the pole post is pressed against the upper part of the horizontal washer ring and is confined within the range of the upper outer edge extension. The lower inner edge extension extends along the hole wall of the first through hole. The sealing ring includes a first sealing ring body pressed between the inner ring groove and the lower limit portion, and a second sealing ring body pressed between the lower limit portion and the lower inner edge extension.

[0010] To address the aforementioned technical problems, this application also provides a battery casing assembly, including the aforementioned electrode assembly, casing, and top cover assembly. The casing includes an outer peripheral wall surrounding a cavity, an end wall that at least partially closes the front end of the outer peripheral wall, and an opening formed at the rear end of the outer peripheral wall. The end wall has a mounting hole adapted to the electrode assembly. The top cover assembly is welded to the opening. A second step portion of the substrate is located on the side of the end wall near the cavity. The first step portion passes through the mounting hole, is flush with the outer surface of the end wall, and is welded integrally with the end wall.

[0011] 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. The second step portion of the substrate is inserted into the inner groove and confined to the inner side of the convex edge. The second step portion is flush with the outer surface of the convex edge and welded to the convex edge as a whole.

[0012] Preferably, the convex edge and the outer edge of the first stepped portion are provided with a groove structure, and the groove structure is filled with solder, so as to achieve sealing welding by melting the solder.

[0013] Preferably, a sealing weld is achieved by irradiating the first step portion and the convex edge contact area from the front of the housing using a laser welding device, and the second step portion blocks any leaked laser light from entering the cavity of the housing.

[0014] Preferably, the top cover assembly includes a substrate and poles assembled on the substrate. An edge fastening groove is formed on the inner outer edge of the substrate, and the edge fastening groove is snapped onto the outer peripheral wall of the outer shell and welded together.

[0015] Compared to existing technologies, the electrode assembly of this application simplifies the assembly method of secondary battery cells by providing a first stepped portion and a second stepped portion on the outer surface of the substrate. The second stepped portion is confined to a first side of the object, and the second stepped portion is exposed to a second side of the object and flush with the object for welding. This allows the electrode assembly to be installed on the object from the inside out. When the object is used as a housing, only a mounting hole needs to be opened at the front end of the housing to expose the electrode assembly, thus fixing the electrode assembly and top cover assembly into a single structure before installing them into the housing. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0017] Figure 1 This is a three-dimensional assembly diagram of the secondary battery cells of this application;

[0018] Figure 2 This is a three-dimensional view of the secondary battery cells from another angle, as per the present application.

[0019] Figure 3 This is a three-dimensional assembly diagram of another manifestation of the secondary battery cell in this application;

[0020] Figure 4 This is an exploded perspective view of a single secondary battery cell in this application;

[0021] Figure 5 This is an exploded perspective view of the secondary battery cell of this application from another angle;

[0022] Figure 6 For the secondary battery cell of this application along Figure 1 The cross-sectional view shown by the dashed line AA;

[0023] Figure 7 for Figure 6 A magnified view of a portion of the dashed circle A shown;

[0024] Figures 8 to 16 Example 1: Electrode assembly and / or top cover assembly

[0025] Figure 8 This is a three-dimensional assembly diagram of the electrode assembly of this application;

[0026] Figure 9 This is an exploded perspective view of the electrode assembly of this application;

[0027] Figure 10 This is a perspective cross-sectional view of the electrode assembly of this application;

[0028] Figure 11 This is a perspective cross-sectional view of the electrode assembly of this application from another angle;

[0029] Figure 12 This is a front sectional view of the electrode assembly of this application;

[0030] Figure 13 for Figure 6 A magnified view of the dashed circle B shown;

[0031] Figure 14 This is a perspective view of the top cover assembly of this application;

[0032] Figure 15 This is a perspective cross-sectional view of the top cover assembly of this application;

[0033] Figure 16 This is a front sectional view of the top cover assembly of this application;

[0034] Figure 17 This is a front sectional view of Embodiment 2 of the electrode assembly and / or top cover assembly of this application;

[0035] Figure 18 This is a front sectional view of Embodiment 3 of the electrode assembly and / or top cover assembly of this application;

[0036] Figure 19 This is a front cross-sectional view of another embodiment of the electrode assembly and housing of this application.

[0037] Explanation of reference numerals in the attached figures

[0038] Outer shell - 10; Cavity - 11; Mounting hole - 12; Opening - 13; End wall - 14; Protruding edge - 141; Inner groove - 142; Outer peripheral wall - 15; Cell assembly - 40; Cell unit - 41; Adapter piece - 42; Bracket - 43; Explosion-proof piece - 50; Electrode assembly - 20; Top cover assembly - 30; Substrate - 21; Base part - 211; Inner annular groove - 212; Outer annular groove - 213; First step part - 214; Second step part - 215; First through hole - 216; Inner annular groove protrusion - 217; Electrode post - 22; Post - 221; Lower limit part - 222; Upper limit part - 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 component - 25; Connector body - 251; Isolation part - 252; Insulating body - 253; Anti-rotation groove - 254; Anti-rotation protrusion - 255; Third through hole 256; Edge retaining groove - 218; Steel pad - 26; Steel pad ring body - 261; Steel pad flange - 262; Welding area - S. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them.

[0040] This application is based on Figure 1 The X direction is the front direction (forward), the Y direction is the lateral direction, and the Z direction is the up-down direction.

[0041] Please see Figure 1 , Figure 2 , Figures 4 to 6 As shown, the secondary battery cell of this application includes a shell 10 with a hollow cavity 11 formed in the front-to-back direction and an opening 13 formed at one end, an electrode assembly 20 inserted into the cavity 11 through the opening 13, a cell assembly 40, and a top cover assembly 30 that closes the opening 13.

[0042] The outer casing 10 includes an outer peripheral wall 15 formed by rotating one revolution around the center of the axis in the X direction, a cavity 11 formed within 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 an opening 13 formed at the rear end. The outer casing 10 can be a square structure, a circular structure, or a blade structure, and the material includes any of the following: aluminum alloy, stainless steel, titanium alloy, etc. In the square structure or blade structure, an explosion-proof piece 50 is provided on the side of the outer peripheral wall 15 with a smaller area. The explosion-proof piece 50 can be formed on the side of the outer peripheral wall 15 by etching, such as laser ablation; or the explosion-proof piece 50 can be stamped separately to form explosion-proof markings, and explosion-proof holes can be opened on the side of the outer peripheral wall 15, and then the stamped explosion-proof piece 50 can be welded to the explosion-proof holes.

[0043] The casing of the secondary battery cell of this application has multiple forming methods. Different manufacturing processes can be adopted for different metal materials. If the casing is made of aluminum alloy, it is preferred to form it by stamping and stretching aluminum alloy sheet. If the casing is made of stainless steel, the casing thickness will be greatly reduced, and it will be more difficult to use the stretching process. In this case, thin steel sheets can be bent and spliced ​​into a predetermined shape and then welded and sealed. Titanium alloy can also be formed by splicing and welding.

[0044] The battery cell assembly 40 includes a battery cell unit 41 located in the middle, adapter plates 42 connected to the battery cell unit 41 at the front and rear ends respectively, and a bracket 43 supporting the battery cell unit 41 at the front and rear ends. The electrode assembly 20 is electrically connected to the front end of the battery cell unit 41 through at least one adapter plate 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 plate 42. The bracket 43 is used to fix the battery cell unit 41 within the cavity 11 of the housing 10 to prevent the battery cell unit 41 from shaking.

[0045] Please continue reading. Figure 7 As shown, the mounting hole 12 on the end wall 14 of the housing 10 is adapted to the electrode assembly 20. 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 protruding edge 141 is formed on the outer side of the inner groove 142.

[0046] The electrode assembly 20 can be circular or racetrack-shaped, such as... Figure 1 , Figure 2 The diagram shows a runway-shaped structure. Figure 3The diagram shows a circular structure; the electrode assembly 20 can also be square or other structures, but the electrode assembly 20 of this application can take many different shapes, although their internal structural principles are basically the same. The electrode assembly 20 of this application serves as the positive electrode of the secondary battery cell, and the top cover assembly 30 serves as the negative electrode of the secondary battery cell. However, the electrode assembly 20 and the top cover assembly 30 can also be used in reverse, serving as the negative and positive electrodes, respectively.

[0047] Please continue reading. Figures 8 to 12 As shown, for ease of description, the electrode assembly 20 of this application is referred to as... Figure 8 The L1 direction is defined as the radial direction, and the L2 direction is defined as vertically upward. The electrode assembly 20 of this application is assembled within the mounting hole 12 on the end wall 14 of the housing 10. The electrode assembly 20 includes a substrate 21 through which a first through hole 216 is formed, an electrode post 22 assembled within the first through hole 216, a sealing ring 24 pressed between the electrode post 22 and the substrate 21, an insulating pad 23 isolating the electrode post 22 and the substrate 21, and an insulating member 25.

[0048] Specifically, the substrate 21 includes a base portion 211, a first step portion 214 and a second step portion 215 arranged radially outward from the outer end face 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 around the first through hole 216, and an inner annular groove 212 formed on the inner side of the base portion 211 around the first through hole 216. The inner diameter of the inner annular groove 212 is larger than the inner diameter of the outer annular groove 213. The inner surfaces of the first step portion 214 and the second step portion 215 are flush with the inner 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 range of the outer diameter of the base portion 211.

[0049] The insulating member 25 includes a connector 251 that adheres to the radially inner wall surface of the inner annular groove 212, an isolation portion 252 extending radially inward from the top of the connector 251, an insulating body 253 extending radially outward from the bottom of the connector 251 and covering the bottom surface of the substrate 21, and a third through hole 256 formed through the isolation portion 252. The inner diameter of the third through hole 256 of the insulating member 25 is larger than the inner diameter of the first through hole 216 of the mounting hole substrate 21, and the isolation portion 252 adheres to the top surface of the inner annular groove 212.

[0050] The pole post 22 includes a post body 221, a lower limiting portion 222 extending radially outward from the bottom of the post body 221, and an upper limiting portion 223 folded radially outward from the top of the post body 221. The middle portion of the post body 221 protrudes outward from the surface of the upper limiting 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. The radial thickness of the second sealing ring body 242 is less than the vertical thickness of the first sealing ring body 241.

[0051] The isolation pad 23 is mounted on the outer annular groove 213 around 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 washer ring 231 that adheres to the surface of the outer annular groove 213, an inner edge lower extension portion 232 that extends downward from the inner side of the horizontal washer ring 231 to the inner wall surface of the first through hole 216, and an outer edge upper extension portion 233 that extends upward from the outer side of the horizontal washer ring 231 along the edge of the outer annular groove 213.

[0052] Please refer to this carefully. Figure 12As shown, when assembling the electrode assembly 20, the sealing ring 24 is first fitted onto the column 221 of the electrode post 22 from top to bottom, and the first sealing ring 241 of the sealing ring 24 is attached to the surface of the lower limiting part 222. The inner wall surfaces of the first sealing ring 241 and the second sealing ring 242 are attached to the outer surface of the column 221. The insulating member 25 is then installed into the inner ring groove 212 on the inner side of the substrate 21. At this time, the top surface of the connector 251 and the isolation part 252 are attached to the inner surface of the inner ring groove 212, but the isolation part 252 only covers the inner surface of the inner ring groove 212 on the radially outer side, while the insulating body 253 covers a certain area of ​​the lower surface of the substrate 21. It should be noted that before the electrode post 22 is assembled, the upper limiting part 223 is not folded outward, but rather... The outer surface of the column 221 is kept flush or does not extend radially outward beyond the outer surface of the column 221. In this step, the unfolded pole post 22 is passed upward through the third through hole 256 and the first through hole 216. The lower limiting part 222 is received in the groove below the isolation part 252, that is, the lower limiting part 222 overlaps with the projection of the insulating body 253 at least in the radial direction. The isolation pad 23 is fitted onto the column 221 from top to bottom. Specifically, the horizontal pad ring 231 of the isolation pad 23 is supported on the outer ring groove 213, and the inner edge extension 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 limiting part 223 in the vertical state is folded outward with a tool to press it onto the horizontal pad ring 231. After riveting, the vertical thickness of the first sealing ring 241 of the sealing ring 24 is compressed and thinned, and it expands radially outward. Finally, the outer edge of the first sealing ring 241 will exert a certain compressive force on the inner edge of the isolation portion 252 of the insulating member 25 to achieve complete sealing. The second sealing ring 242 is pressed downward by the lower inner edge extension 232 of the isolation pad 23 to achieve sealing. The upper limit portion 223 is at least partially wrapped by the upper outer edge extension 233.

[0053] It should be noted that the electrode assembly in this application Figure 8 , Figure 9 The diagram shows a runway-shaped structure. Figure 10 , Figure 11 This is a three-dimensional cross-sectional view of a circular structure, and Figure 12 The cross-sectional views of both the racetrack-shaped structure and the circular structure are identical. Because the racetrack-shaped structure has straight edges on its outer periphery, there is no need to worry about the internal components rotating, whereas the circular electrode assembly requires ensuring that its internal components do not rotate.

[0054] Please refer to the key points. Figure 10 , Figure 11As shown, when the electrode assembly 20 is circular, an anti-rotation structure is required. Specifically, the base portion 211 of the substrate 21 protrudes radially inward to form an inner ring groove protrusion 217 located within the inner ring groove 212. The connecting portion 251 of the insulating member 25, corresponding to the position of the inner ring groove protrusion 217, is recessed inward to form an anti-rotation groove 254 and an anti-rotation protrusion 255 protruding to the lower side of the isolation portion 252. The lower limiting portion 222 of the electrode post 22 has an anti-rotation notch 224 formed on the outer periphery of the anti-rotation protrusion 255. After assembly, the substrate 21 is engaged with the anti-rotation groove 254 of the insulating member 25 by the inner ring groove protrusion 217 to prevent them from rotating, while the anti-rotation protrusion 255 of the insulating member 25 is engaged with the anti-rotation notch 224 outside the lower limit part 222 of the electrode post 22 to prevent them from rotating. In this way, the electrode assembly 20 can effectively prevent the insulating member 25 and the electrode post 22 from rotating relative to the substrate 21.

[0055] The electrode assembly 20 of this application has an anti-rotation notch 224 on the outer periphery of the lower limit portion 222 of the electrode post 22 to cooperate with the insulating member 25 and the substrate 21, thereby achieving stability among the three. Compared with the traditional method of setting the anti-rotation structure of the electrode post 22 on the outer surface of the post 221, the integrity of the post 221 can be maintained, avoiding damage to its transmission and load-bearing capacity. At the same time, it can effectively reduce the processing difficulty and complexity of the electrode post 22 and reduce manufacturing costs.

[0056] Please continue reading. Figures 13 to 16 As shown, the top cover assembly 30 and the electrode assembly 20 have basically similar structures. The difference is that the substrate 21 of the top cover assembly 30 has a wider area to cover the opening 13 at one end of the outer shell 10, and the inner side of the outer edge of the substrate 21 is provided with an edge fastening groove 218 to fit against the outer peripheral wall 15 of the outer shell 10 for welding and fixing. The substrate 21 has some structural differences, specifically: the design of the second step portion 215 is omitted, while the rest of the structure is basically the same.

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

[0058] Please continue reading. Figure 17 , Figure 18 As shown, the electrode assembly 20 and top cover assembly 30 of this application also include other embodiments. To ensure the gripping force of the upper limit portion 223 of the electrode post 22, a steel pad 26 is sandwiched between the horizontal pad ring 231 of the isolation pad 23 and the upper limit portion 223. The steel pad 26 has a thin sheet structure (e.g., Figure 17As shown), the steel pad 26 disperses the compressive force of the upper limit portion 223 on the horizontal pad ring 231, preventing damage to the isolation pad 23. The steel pad 26 also includes a horizontal steel pad ring 261 and a steel pad flange 262 formed by folding upwards from the outer edge of the steel pad ring 261 (as shown). Figure 18 As shown, the presence of the steel pad flange 262 can limit the radially outward rolling range of the upper limit portion 223 when it is squeezed and folded, thus avoiding damage to the outer edge extension portion 233 caused by excessive compression.

[0059] The outer casing 10, electrode assembly 20 and top cover assembly 30 are battery casing assemblies of this application. The electrode assembly 20 and the top cover assembly 30 are only used to distinguish the difference between the two as positive and negative electrodes. In actual implementation, the two can be unified under one name, namely top cover assembly or electrode assembly.

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

[0061] S10: Weld and fix the different adapter pieces 42 to the electrode posts 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;

[0062] In this step, the adapter piece 42 is attached to the lower surface of the column 221 of the pole post 22 and fixed together by welding on one side of the adapter piece 42.

[0063] S20: The adapter plate 42 connected to the electrode assembly 20 and the top cover assembly 30 is passed through the bracket 43 and electrically connected to the two poles of the 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 another bracket 43, so that the electrode assembly 20, the top cover assembly 30 and the cell unit 41 become a combination through the bracket 43.

[0064] S30: Push the assembly obtained in step S20 into the cavity 11 through the opening 13 at the rear end of the outer shell 10;

[0065] 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. The fixing structures include snap-fit ​​structures or adhesive bonding structures, etc., and the longitudinal ends of the battery cell 41 are respectively fixed by a pair of brackets 43. This makes the electrode assembly 20, the top cover assembly 30 and the battery cell 41 a relatively stable integral structure. After the above assembly is pushed into the cavity 11, the electrode assembly 20 is pushed to the mounting hole 12 on the end wall 14 on the front side of the outer shell 10. The outer shape of the bracket 43 corresponds to the shape of the cavity 11, so that the assembly is held in a predetermined position after being pushed in.

[0066] Key references Figure 17 As shown, the second stepped portion 215 of the substrate 21 of the electrode assembly 20 is received within the inner groove 142 of the end wall 14 and overlaps with the lower side of the protruding edge 141. The bottom surface of the second stepped 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 stepped portion 214 is flush with the outer surface of the end wall 14. That is, the thickness of the first stepped portion 214 is the same as the thickness of the end wall 14, and the edge of the first stepped portion 214 is in close contact with the edge of the mounting hole 12. There is a certain gap between the edge of the second stepped portion 215 and the edge of the inner groove 142.

[0067] Key references Figure 6 , Figure 13 As shown, the base plate 21 of the top cover assembly 30 closes the opening 13 of the outer shell 10, and the edge fastening groove 218 fits against the edge of the opening 13 of the outer shell 10 for limiting.

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

[0069] In this step, the electrode assembly 20 is irradiated with a laser from the front side of the end wall 14 at the contact point between the first step portion 214 and the mounting hole 12, and a welding zone S is formed by welding around the perimeter, so that the substrate 21 of the electrode assembly 20 and the end wall 14 are sealed and fixed as a whole.

[0070] During laser irradiation, the second stepped portion 215 can block leaked laser light, preventing it from leaking into the cavity 11 and damaging the battery cell 41. Simultaneously, the second stepped portion 215, when in contact with the protruding edge 141, also serves as an initial positioning element.

[0071] In one embodiment, the protruding edge 141 and the upper end of the first stepped portion 214 are provided with a groove structure, and solder is added in the groove structure to increase the stability and operability of the welding.

[0072] The welding of the top cover assembly 30 to the edge of the opening 13 is prior art. For details, please refer to the applicant's published patent technology 202323075601.2, which will not be repeated here.

[0073] Compared to existing technologies, the electrode assembly, secondary battery cell, and manufacturing method of this application simplify assembly and improve processing efficiency by providing an opening 13 at one end of the outer casing 10 and a closed end wall 14 at the other end. This allows the battery cell 41, electrode assembly 20, and top cover assembly 30 to be electrically connected via an adapter piece 42 before being inserted into the outer casing 10 for assembly. Finally, the electrode assembly 20 and top cover assembly 30 are welded to the mounting hole 12 and opening 13, respectively.

[0074] The main difference lies in attaching the electrode assembly 20 to the end wall 14 from the inside out and welding it with external laser irradiation. This simplifies the assembly process and ensures the feasibility of laser welding. Compared to existing technologies where both top cover assemblies 30 require external welding, this makes welding the adapter piece 42 much simpler and more feasible.

[0075] In another embodiment, such as Figure 19 As shown, the end wall 14 is designed to fold inward slightly from the outer peripheral wall 15 of the housing to support the electrode assembly 20 inserted from the inside out. That is, the mounting hole 12 is a square hole or other large-shaped hole adapted to the shape of the housing 10, meaning the shape of the electrode assembly 20 is closer to the shape of the top cover assembly 30. Regardless of the specific design, the key point of this application is that the electrode assembly 20 is inserted from one side of the opening 13 of the housing 10 into the mounting hole 12 at the opposite end of the opening 13.

[0076] This application also provides an electrical device, which is an electric vehicle, an energy storage device, etc.

[0077] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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.

[0078] The above embodiments only illustrate preferred implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An electrode assembly, characterized by, The application relates to an electrode assembly, a shell and a top cover assembly. The substrate comprises a base part with a first through hole; An isolation pad covers the base part around the first through hole and is provided with a second through hole coaxial with the first through hole; An insulation part covers the lower side of the substrate and is provided with a third through hole corresponding to the first through hole; A pole comprises a pole body, a lower limiting part protruding radially outward from the lower end of the pole body and an upper limiting part protruding radially outward from the upper end of the pole body, the lower limiting part abuts against the insulation part and the upper limiting part abuts against the isolation pad, the base part around the first through hole is clamped between the lower limiting part and the upper limiting part; A sealing ring is clamped between the lower limiting part and the base part; The base part of the substrate is sequentially provided with a first step part and a second step part from inside to outside, and the surface of the second step part is lower than the surface of the first step part.

2. The electrode assembly of claim 1, wherein, The upper surface of the base part is the first step part or the upper surface of the first step part is lower than the upper surface of the base part.

3. The electrode assembly of claim 1, wherein, The base part is provided with an inner ring groove and an outer ring groove on the inner and outer sides around the first through hole, the inner diameter of the inner ring groove is larger than the inner diameter of the outer ring groove, the isolation pad is limited in the outer ring groove and the insulation part is limited in the inner ring groove.

4. The electrode assembly of claim 3, wherein, The insulation part comprises a vertical connecting body, an isolation part extending radially inward from the upper end of the connecting body, a third through hole formed through the isolation part and an insulation main body extending radially outward from the lower end of the connecting body, the connecting body and the isolation part are limited in the inner ring groove, the isolation part and the connecting body isolate the substrate and the pole, the insulation main body covers the lower surface of the substrate and the lower limiting part is limited in the connecting body.

5. The electrode assembly of claim 4, wherein, The isolation pad comprises a horizontal pad ring supported on the surface of the outer ring groove, a second through hole formed through the horizontal pad ring, an outer edge upper extending part extending upward from the outer edge of the horizontal pad ring and an inner edge lower extending part extending downward from the inner edge of the horizontal pad ring, the upper limiting part of the pole is pressed above the horizontal pad ring and is limited in the range of the outer edge upper extending part, the inner edge lower extending part extends along the hole wall of the first through hole, the sealing ring comprises a first sealing ring body pressed between the inner ring groove and the lower limiting part and a second sealing ring body pressed between the lower limiting part and the inner edge lower extending part.

6. A battery housing assembly characterized by, The electrode assembly, the shell and the top cover assembly are provided in the application, the shell comprises an outer peripheral wall surrounding a cavity, an end wall closing at least the front end of the outer peripheral wall and an opening formed at the rear end of the outer peripheral wall, a mounting hole adapted to the electrode assembly is formed in the end wall, the top cover assembly is closed and welded to the opening, the second step part of the substrate is limited on the side of the end wall close to the cavity, the first step part is flush with the outer surface of the end wall through the mounting hole and is integrated with the end wall by welding.

7. The battery case assembly of claim 6, wherein The inner surface of the end wall at the edge of the mounting hole is concave to form an inner groove and a convex edge, the second step portion of the base plate is clamped into the inner groove and limited inside the convex edge, the second step portion is flush with the outer surface of the convex edge and is welded as a whole.

8. The battery case assembly of claim 7, wherein, The convex edge and the outer edge of the first step portion are provided with a groove structure, the groove structure is filled with solder, and sealing welding is achieved by melting the solder.

9. The battery case assembly of claim 7, wherein, Sealing welding is achieved by irradiating the abutting part of the first step portion and the convex edge from the front of the shell through a laser welding device, and the second step portion blocks the leaked laser from entering the cavity of the shell.

10. The battery case assembly of claim 7, wherein, The top cover assembly includes a base plate and a pole column assembled on the base plate, the inner side of the base plate is formed with an edge buckle groove, and the edge buckle groove is buckled on the outer peripheral wall of the shell and welded together.

Images