A new energy automobile battery assembly sealing strip resistance welding equipment and process
Patent Information
- Application Number
- CN202611321228.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-08-28
- Publication Date
- 2026-09-29
AI Technical Summary
[0005]本发明提供了一种新能源汽车电池组件密封带电阻焊接设备及工艺，解决了由于焊缝存在微裂纹且与密封带同步焊接需独立作业的问题
（1）该新能源汽车电池组件密封带电阻焊接设备及工艺，通过在密封带内部复合导电芯，使密封带同时承担弹性密封和导电焊接功能，将金属法兰焊接与密封件装配的两道独立工序合并为一道工序，焊接时电流优先通过内部导电芯形成内部熔核，外部橡胶密封层不被高温烧损，焊接完成后直接形成弹性密封，无需焊后额外打胶，同时导电芯可自适应补偿法兰平面度误差，避免传统直接滚焊时间隙过大导致的虚焊、未熔合、局部烧穿等焊接缺陷，有效稳定焊接电流密度，大幅提升大尺寸电池包法兰焊接的合格率与焊缝质量一致性。
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Figure CN122829375A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of resistance welding technology for battery component sealing strips, specifically to a resistance welding equipment and process for sealing strips of new energy vehicle battery components. Background Technology
[0002] The sealing of battery pack housings in new energy vehicles often employs a process of using sealant in conjunction with fastening bolts. This involves arranging dozens of bolts along the circumference of the flange to compress the sealant, achieving a seal. However, this process suffers from a large number of parts, cumbersome assembly procedures, and low production efficiency. Furthermore, the sealant is prone to aging and cracking under long-term high and low temperature cycles and vibration conditions, resulting in insufficient seal life and making it difficult to meet the growing usage requirements of current new energy vehicles. Therefore, the existing process uses a direct contact welding method between the upper and lower flanges. Pressure is applied through roller electrodes to fuse the contact surfaces of the two flanges directly, forming a metal weld.
[0003] However, relying solely on a single layer of metal weld to achieve a seal can lead to leakage due to micron-level pores and microcracks in the weld. Additional sealant must be applied after welding, and metal spatter generated during welding can easily enter the enclosure, posing a risk of short circuits in the battery cells. Furthermore, the weld quality at corners and curves is unstable, the contact area between the roller and the flange at corners is reduced, the pressure distribution is uneven, the weld nugget size is insufficient, the welding current is unstable, and the welding quality is poor.
[0004] To address the aforementioned technical deficiencies, a solution is proposed. Summary of the Invention
[0005] This invention provides a resistance welding equipment and process for sealing strips of new energy vehicle battery components, which solves the problem that the weld seam has micro-cracks and needs to be welded independently with the sealing strip.
[0006] To achieve the goal of preferential current flow through the internal conductive core to form an internal melt nugget during welding, preventing the external rubber sealing layer from being burned by high temperature, and directly forming an elastic seal after welding, the present invention achieves this through the following technical solution: a resistance welding equipment for sealing strips of new energy vehicle battery components, including a roll welding machine and a clamping component for clamping the battery pack. The battery pack is provided with a battery cover, an upper flange is fixedly connected to the bottom of the outer wall of the battery cover, a lower flange is fixedly connected to the top of the outer wall of the battery pack, and a three-core sealing strip is sandwiched between the upper flange and the lower flange. The three-layer sealing strip has a three-layer composite structure, including an upper sealing layer on the top layer, a lower sealing layer on the bottom layer, and a conductive core sandwiched between the two. Both the upper and lower sealing layers are provided with long grooves, and both ends of the conductive core are fixedly connected with protruding ribs. The protruding ribs pass through and penetrate to the end of the long groove away from the conductive core. During welding, the exposed protruding ridges directly contact the upper flange and the lower flange respectively, and the conductive core constitutes the main path of welding current, so that the contact surfaces of the conductive core with the upper flange and the lower flange are fused to form a continuous internal weld nugget. The upper and lower sealing layers maintain structural integrity during the welding process and, after welding, fit tightly against the flange surface to form an elastic seal.
[0007] Furthermore, the conductive core is a multi-layer composite metal structure, with protruding ridges on its upper and lower surfaces extending along the length of the sealing strip. The protruding ridges are exposed through the long groove, serving as the contact welding position between the conductive core and the flange.
[0008] Furthermore, there are four protruding ridges, which are evenly distributed on the upper and lower surfaces of the conductive core. The protruding ridges on one side of the conductive core are distributed inward and outward. A uniformly distributed groove extending along the length of the sealing strip is opened on the conductive core between two protruding ridges to make the welding current evenly distributed to the two protruding ridges, forming a double independent weld nugget.
[0009] Furthermore, the surface of the convex ridge is provided with a coarse tooth surface layer for breaking the oxide film on the flange surface; The top of the protruding ridge has a micro-arc to prevent the pressure from the edge of the ridge from concentrating and damaging the upper and lower flanges; The conductive core has micro-flanges on both sides in the width direction to prevent the sealing layer material from entering the contact surface between the ridge and the upper and lower flanges.
[0010] Furthermore, the conductive core surface is provided with cross-grid-shaped primary stress grooves and secondary stress grooves to release thermal expansion and vibration stress.
[0011] Furthermore, the conductive core has positioning points distributed on its surface. When the three-sandwich sealing strip is vulcanized, the rubber filling of the upper and lower sealing layers enters the positioning points. After cooling, a mechanical interlock is formed, realizing the positioning of the conductive core with the upper and lower sealing layers.
[0012] Furthermore, the three-sandwich sealing strip is a pre-formed integral frame structure that matches the contours of the upper and lower flanges. At the corner of the sealing strip, the convex ridge is provided with a compensation protrusion to compensate for the difference in welding pressure and current density at the corner.
[0013] A resistance welding process for sealing strips of new energy vehicle battery components, applied to the resistance welding equipment for sealing strips of new energy vehicle battery components as described in any one of claims 1-7, includes the following steps: Step 1: Position the lower battery pack housing on the clamping component. Lay the pre-formed frame-shaped three-pronged sealing strip on the lower flange, aligning the convex edge of the conductive core with the center of the flange. The long grooves on the upper and lower sealing layers correspond to the positions of the convex edges, allowing the convex edges to protrude and expose the metal surface. The micro-flanges on both sides of the conductive core in the width direction are protrusions that extend above the surface of the metal core. During rubber vulcanization, they are embedded in the side of the sealing layer, holding the sealing layer in place from the width direction and restricting the sealing layer from moving laterally along the metal core. The positioning points on the surface of the conductive core are concave micro-pits. During vulcanization, the rubber flows into the pits and cools to form a mechanical rivet, preventing the sealing layer and the metal core from shifting relative to each other during vibration and thermal expansion. Step 2: Fasten the battery cover so that the upper flange is aligned and pressed onto the three-core sealing strip. The clamping device completes the initial positioning. The micro-arc at the top of the convex ridge is a rounded transition to avoid the sharp ridge pressing into the flange surface and causing indentation. At the same time, it ensures that the contact area between the convex ridge and the flange is stable and the pressure is evenly distributed. Step 3: Start the roll welding machine. The rollers move along the flange track and apply pressure. Welding current is applied simultaneously. The current preferentially passes through the middle conductive core to form a circuit. The uniformly distributed groove between the two protruding ridges is a shallow groove that does not penetrate through. This increases the resistance at this position and forces the current to be evenly distributed to the two protruding ridges, avoiding the situation where the current on one protruding ridge is too large and burns through, or the current on the other ridge is insufficient and fails to fuse. Step 4: The coarse tooth surface layer of the convex ridge is a micro-pointed tooth structure. When pressure is applied, the points first pierce the dense oxide film on the flange surface, so that the convex ridge is in direct contact with the flange base metal, reducing the contact resistance and avoiding poor welding caused by the oxide film. Step 5: The convex ridge and the upper and lower flanges are fused to form a double continuous internal fusion nugget. The compensation convex point at the corner of the sealing strip is a micro-convex point that is higher than the straight section convex ridge. This compensates for the small contact area of the roller at the corner and the decrease in current density caused by insufficient pressure, ensuring that the size of the corner fusion nugget is consistent with that of the straight section. During the welding process, the heat is concentrated in the conductive core area. The main stress groove and the secondary stress groove are shallow grooves with cross-grids, which provide deformation space for the thermal expansion of the metal core, avoiding thermal expansion and contraction that could crack the sealing layer. At the same time, it increases the bonding area between the rubber and the metal core to prevent delamination. The micro-convex flange also prevents the squeezed rubber from flowing to the contact surface of the convex ridge, preventing the rubber from being separated between the convex ridge and the flange and causing insulation. The upper and lower sealing layers are only softened by heat but not burned or carbonized. At the same time, a barrier is formed around the welding area to prevent welding spatter from entering the interior of the housing. Step 6: After the entire ring welding is completed, maintain pressure and cool. After the internal molten core has completely solidified, release the clamping parts. The upper and lower sealing layers rely on their own elastic rebound to tightly adhere to the flange surface, forming a double elastic seal. Together with the internal double metal molten core, they constitute a multi-layer composite sealing structure.
[0014] The present invention has the following beneficial effects: (1) The resistance welding equipment and process for sealing strips of new energy vehicle battery components, by composite conductive core inside the sealing strip, enables the sealing strip to simultaneously undertake the functions of elastic sealing and conductive welding, and combines the two independent processes of metal flange welding and sealing component assembly into one process. During welding, the current preferentially passes through the internal conductive core to form an internal molten core, and the external rubber sealing layer is not burned by high temperature. After welding, an elastic seal is directly formed without the need for additional glue after welding. At the same time, the conductive core can adaptively compensate for the flange flatness error, avoiding welding defects such as false welding, lack of fusion, and local burn-through caused by excessive gap during traditional direct roll welding. It effectively stabilizes the welding current density and significantly improves the pass rate and weld quality consistency of large-size battery pack flange welding.
[0015] (2) The resistance welding equipment and process for sealing strips of new energy vehicle battery components, by combining inner and outer rubber sealing layers to form a multi-composite sealing structure, significantly reduces the leakage rate. The coarse tooth structure on the convex surface can directly break the dense oxide film on the flange surface, avoiding the false welding caused by the oxide film. The uniformly distributed groove forces the current to be evenly distributed to the two convex edges. The corner compensation convex point solves the problem of insufficient pressure and high leakage rate at the corner position of traditional roll welding. During the welding process, the rubber layer naturally forms a barrier to block welding spatter, avoiding the spatter from entering the battery and causing the cell short circuit hazard. The main and secondary stress grooves and positioning point structure ensure the structural stability of the sealing strip under high and low temperature cycles and long-term road vibration generated by resistance welding.
[0016] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention from another angle; Figure 3 This is a schematic diagram of the battery box structure of the present invention; Figure 4 for Figure 3 Enlarged structural diagram at point A; Figure 5 This is a schematic diagram of the structure of the battery cover with an upper flange fixedly connected to the bottom of the outer wall; Figure 6 for Figure 5 Enlarged structural diagram at point B; Figure 7 This is a schematic diagram of the upper flange portion of the present invention; Figure 8 for Figure 7 Enlarged schematic diagram of the structure at point C; Figure 9 This is an exploded view of the three-core sealing strip structure of the present invention; Figure 10 This is a schematic diagram of the upper sealing plate of the present invention having an elongated groove; Figure 11 This is a schematic diagram of the conductive core structure of the present invention; Figure 12 for Figure 11 Enlarged structural diagram at point D; Figure 13 This is a schematic diagram of the longitudinal section of the protruding ridge portion of the present invention.
[0018] In the diagram: 1. Roll welding machine; 2. Clamping component; 3. Battery pack; 301. Battery cover; 302. Upper flange; 303. Lower flange; 304. Upper sealing layer; 3041. Long groove; 305. Conductive core; 3051. Raised ridge; 3052. Micro-flange; 3053. Main stress groove; 3054. Secondary stress groove; 3055. Positioning point; 3056. Micro-arc; 3057. Compensation protrusion; 3058. Uniformly distributed groove; 306. Lower sealing layer; 3059. Coarse tooth surface layer. Detailed Implementation
[0019] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.
[0020] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.
[0021] Please see Figures 1-13 The present invention provides a technical solution: a resistance welding equipment for sealing tape of new energy vehicle battery components, including a roll welding machine 1 and a clamping member 2 for clamping battery pack 3. A battery cover 301 is provided on the battery pack 3. An upper flange 302 is connected to the bottom of the outer wall of the battery cover 301, and a lower flange 303 is connected to the bottom of the outer wall of the battery pack 3. A three-core sealing tape is sandwiched between the upper flange 302 and the lower flange 303.
[0022] Roll welding machine 1 is a gantry-type seam welding machine, including a frame, roller electrodes that can travel along the flange track, welding power supply and constant pressure mechanism. The roller electrodes are made of high conductivity copper alloy. During welding, they move circumferentially along the flange contour. The pressure mechanism applies stable pressure to the flange and outputs pulse welding current. Unlike traditional roll welding machines that directly weld bare metal flanges, the welding parameters of this equipment are adapted to the conductivity characteristics of the three-core sealing strip. The current preferentially passes through the middle conductive core 305 to form a circuit, and the heat input is more concentrated. A smaller welding current can be used to form a stable weld nugget, reducing flange thermal deformation and warping caused by large current.
[0023] The clamping component 2 includes a contour positioning seat and quick clamps distributed on the outside of the flange. The contour positioning seat matches the shape of the lower casing of the battery pack 3 to achieve quick positioning of the lower casing and limit the horizontal displacement of the casing during the welding process. The quick clamps are distributed at intervals along the circumference of the flange and apply a uniform pre-tightening force to the outside of the flange after the battery cover 301 is fastened.
[0024] The three-layer sandwich sealing strip has a three-layer composite structure, including an upper sealing layer 304 on the top, a lower sealing layer 306 on the bottom, and a conductive core 305 sandwiched between the two. The upper sealing layer 304 and the lower sealing layer 306 are made of high-temperature resistant elastic sealing material, and their width is adapted to the width of the flange. They can completely cover the flange sealing surface. During the welding process, they are only softened by heat but will not be burned or carbonized. After welding, they can rely on their own elasticity to tightly adhere to the flange surface to form an elastic seal.
[0025] Both the upper sealing layer 304 and the lower sealing layer 306 are provided with long grooves 3041. The upper and lower ends of the conductive core 305 are provided with protruding ribs 3051. The protruding ribs 3051 pass through and extend to the outside of the long grooves 3041, exposing the metal surface. During welding, the exposed protruding ribs 3051 directly contact the upper flange 302 and the lower flange 303 respectively. The conductive core 305 constitutes the main path of welding current. The welding current preferentially passes through the conductive core 305 to form a loop, so that the contact surfaces of the conductive core 305 with the upper flange 302 and the lower flange 303 are fused to form a continuous internal weld nugget.
[0026] In this embodiment, the conductive core 305 adopts a multi-layer composite metal structure. It can also adopt a metal mesh or foil structure according to actual needs. The protruding ribs 3051 on the upper and lower surfaces of the conductive core 305 extend along the length of the sealing strip and serve as the contact welding positions between the conductive core 305 and the flange. There are four protruding ribs 3051 in total, with two on the upper and lower surfaces of the conductive core 305 and distributed in an inner and outer manner. A uniformly distributed groove 3058 extending along the length of the sealing strip is opened on the conductive core 305 between the two protruding ribs 3051. The uniformly distributed groove 3058 is a shallow groove that does not penetrate through, which can increase the resistance at this position and force the welding current to be evenly distributed to the two protruding ribs 3051. This avoids the current of one protruding rib 3051 being too large and burning through, and the current of the other protruding rib being insufficient and not fused. After welding, two independent weld nuggets are formed to achieve bimetallic sealing redundancy.
[0027] The surface of the raised rib 3051 is provided with a coarse tooth surface layer 3059, which is a micro-pointed tooth structure. When welding pressure is applied, the pointed teeth can first pierce the dense oxide film on the flange surface, so that the raised rib 3051 can directly contact the flange base metal, reduce the contact resistance, and avoid the poor weld caused by the oxide film. The top of the raised rib 3051 is provided with a micro-arc 3056, which is a rounded corner transition structure. This can avoid pressure concentration at the edge of the raised rib 3051, prevent the pointed rib from damaging the flange surface, and at the same time ensure that the contact area between the raised rib 3051 and the flange is stable and the pressure is evenly distributed.
[0028] The conductive core 305 has micro-flanges 3052 on both sides in the width direction. These are raised structures that protrude above the surface of the metal core. During rubber vulcanization, they are embedded in the side of the sealing layer, holding the sealing layer in place in the width direction and restricting the sealing layer from moving laterally along the metal core. During welding, the micro-flanges 3052 can also prevent the squeezed rubber from flowing to the contact surface of the protrusion 3051, thus avoiding the rubber from being stuck between the protrusion 3051 and the flange, which could lead to poor insulation.
[0029] The conductive core 305 has cross-grid-shaped main stress grooves 3053 and secondary stress grooves 3054 on its surface. The main stress grooves 3053 are set perpendicular to the length direction of the sealing strip, and the secondary stress grooves 3054 are set parallel to the length direction of the sealing strip. Both are shallow grooves that do not penetrate each other and have a shallow depth, so they will not affect the structural strength and conductivity of the conductive core 305. During welding, the main stress grooves 3053 and secondary stress grooves 3054 provide deformation space for the thermal expansion of the metal core, avoiding the sealing layer from being cracked by thermal expansion and contraction. At the same time, the grid-shaped grooves can increase the bonding area between the rubber and the metal core, preventing the two from delaminating.
[0030] The conductive core 305 has stamped recessed positioning points 3055 distributed on its surface. During the vulcanization of the three-sandwich sealing strip, the rubber of the upper sealing layer 304 and the lower sealing layer 306, which are in a high-temperature flowing state, will automatically fill into the positioning points 3055. After the rubber cools and solidifies, the rubber filled in the recessed points becomes integrated with the sealing layer body, forming a mechanical interlocking structure similar to a rivet. Without the need for additional processing of the mating structure on the sealing layer, the positioning of the conductive core 305 with the upper sealing layer 304 and the lower sealing layer 306 can be achieved, preventing the sealing layer from shifting relative to the conductive core 305 under welding pressure, thermal expansion and contraction, or long-term vibration.
[0031] The three-core sealing strip is a pre-formed integral frame structure that matches the flange profile, without splicing joints. At the corner of the sealing strip, a compensation protrusion 3057 is provided on the protrusion 3051. The height of the compensation protrusion 3057 is higher than that of the protrusion 3051 at the straight section. This can compensate for the decrease in current density caused by the small contact area of the roller at the corner and insufficient pressure, ensuring that the size of the weld nugget at the corner is consistent with that at the straight section, thus solving the problem of high leakage rate at corners in traditional roll welding.
[0032] The resistance welding process for sealing strips of new energy vehicle battery components disclosed in this embodiment uses the above-mentioned equipment and includes the following steps: Step 1: Position the lower casing of battery pack 3 on clamping component 2. Lay the pre-formed frame-shaped three-core sealing strip on the lower flange 303, aligning the protruding rib 3051 of the conductive core 305 with the center of the flange. At this time, the long grooves 3041 on the upper sealing layer 304 and the lower sealing layer 306 correspond to the positions of the protruding rib 3051, allowing the protruding rib 3051 to pass through and expose the metal surface. The micro-flange 3052 limits the sealing layer from the width direction. The positioning point 3055 fixes the sealing layer through mechanical interlocking formed by vulcanization, preventing the sealing strip from shifting during installation.
[0033] Step 2: Fasten the battery cover 301, so that the upper flange 302 is aligned and pressed onto the three-core sealing strip. The clamping part 2 completes the initial positioning. At this time, the micro-arc 3056 on the top of the protruding edge 3051 prevents the sharp edge from damaging the flange. The sealing layer is initially compressed and adheres to the flange surface.
[0034] Step 3: Start the roller welding machine 1. The roller moves along the flange track and applies pressure. Welding current is simultaneously introduced. The current preferentially passes through the middle conductive core 305 to form a circuit. The evenly distributed groove 3058 forces the current to be evenly distributed to the two protruding ribs 3051. The coarse tooth surface layer 3059 on the surface of the protruding ribs 3051 crushes the oxide film on the flange surface, so that the protruding ribs 3051 can reliably contact the flange.
[0035] Step 4: The protruding ridge 3051, the upper flange 302, and the lower flange 303 are fused together to form a double continuous internal weld nugget. The compensation protrusion 3057 at the corner position compensates for insufficient pressure and current at that position, ensuring the quality of the corner welding.
[0036] Step 5: During the welding process, heat is concentrated in the conductive core 305 area. The main stress groove 3053 and the secondary stress groove 3054 release the thermal expansion stress of the metal. The micro flange 3052 prevents the rubber from flowing into the welding surface. The upper sealing layer 304 and the lower sealing layer 306 are only softened by heat and are not burned. At the same time, they prevent welding spatter from entering the box.
[0037] Step 6: After the entire circle of welding is completed, maintain pressure and cool. After the internal molten core has completely solidified, release the clamping part 2. The upper sealing layer 304 and the lower sealing layer 306 rely on their own elastic rebound to tightly adhere to the flange surface to form a double elastic seal, which together with the internal double metal molten core constitutes a multi-layer composite sealing structure.
[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.
Claims
1. A resistance welding device for sealing strips of new energy vehicle battery components, comprising a roll welding machine (1) and a clamping member (2) for clamping a battery pack (3), characterized in that: The battery pack (3) is provided with a battery cover (301), an upper flange (302) is fixedly connected to the bottom of the outer wall of the battery cover (301), a lower flange (303) is fixedly connected to the top of the outer wall of the battery pack (3), and a three-core sealing strip is sandwiched between the upper flange (302) and the lower flange (303). The three-layer sealing strip has a three-layer composite structure, including an upper sealing layer (304) on the upper layer, a lower sealing layer (306) on the lower layer, and a conductive core (305) sandwiched between the two. Both the upper sealing layer (304) and the lower sealing layer (306) are provided with long grooves (3041), and both ends of the conductive core (305) are fixedly connected with protruding ribs (3051). The protruding ribs (3051) pass through and penetrate to the end of the long groove (3041) away from the conductive core (305). During welding, the exposed protruding ridge (3051) directly contacts the upper flange (302) and the lower flange (303) respectively. The conductive core (305) constitutes the main path of welding current, so that the contact surface of the conductive core (305) and the upper and lower flanges fuses to form a continuous internal weld nugget. The upper sealing layer (304) and the lower sealing layer (306) maintain structural integrity during the welding process and form an elastic seal by tightly fitting with the flange surface after welding.
2. The resistance welding equipment for sealing tape of new energy vehicle battery components according to claim 1, characterized in that: The conductive core (305) is a multi-layer composite metal structure. The protruding ribs (3051) on its upper and lower surfaces extend along the length of the sealing strip. The protruding ribs (3051) are exposed through the long groove (3041) and serve as the contact welding position between the conductive core (305) and the flange.
3. The resistance welding equipment for sealing tape of new energy vehicle battery components according to claim 2, characterized in that: The number of the protruding ridges (3051) is four, and they are evenly distributed on the upper and lower surfaces of the conductive core (305). The protruding ridges (3051) on one side of the conductive core (305) are distributed inward and outward. A uniformly distributed groove (3058) extending along the length of the sealing strip is opened on the conductive core (305) between two protruding ridges (3051) to make the welding current evenly distributed to the two protruding ridges (3051) to form a double independent weld nugget.
4. The resistance welding equipment for sealing tape of new energy vehicle battery components according to claim 2, characterized in that: The surface of the protruding rib (3051) is provided with a coarse tooth surface layer (3059) for breaking the oxide film on the flange surface; The top of the protruding rib (3051) is provided with a micro-arc (3056) to avoid the pressure concentration at the edge of the protruding rib (3051) from damaging the upper flange (302) and the lower flange (303). The conductive core (305) has micro-flanges (3052) on both sides in the width direction to prevent the sealing layer material from entering the contact surface between the ridge (3051) and the upper flange (302) and the lower flange (303).
5. The resistance welding equipment for sealing strips of new energy vehicle battery components according to claim 1, characterized in that: The conductive core (305) has cross-grid-shaped main stress grooves (3053) and secondary stress grooves (3054) on its surface to release thermal expansion and vibration stress.
6. The resistance welding equipment for sealing strips of new energy vehicle battery components according to claim 1, characterized in that: The conductive core (305) has positioning points (3055) distributed on its surface. When the three-sandwich sealing strip is vulcanized, the rubber filling of the upper sealing layer (304) and the lower sealing layer (306) enters the positioning points (3055). After cooling, mechanical interlocking is formed, thereby realizing the positioning of the conductive core (305) with the upper sealing layer (304) and the lower sealing layer (306).
7. The resistance welding equipment for sealing strips of new energy vehicle battery components according to claim 1, characterized in that: The three-sandwich sealing strip is a pre-formed integral frame structure that matches the contours of the upper flange (302) and the lower flange (303). At the corner of the sealing strip, the convex ridge (3051) is provided with a compensation convex point (3057) to compensate for the difference between welding pressure and current density at the corner.
8. A resistance welding process for sealing strips of new energy vehicle battery components, applied to the resistance welding equipment for sealing strips of new energy vehicle battery components as described in any one of claims 1-7, characterized in that, Includes the following steps: Step 1: Position the lower housing of the battery pack (3) on the clamping member (2), and lay the pre-formed frame-shaped three-core sealing strip on the lower flange (303) so that the protrusion (3051) of the conductive core (305) is aligned with the center of the flange. The long groove (3041) on the upper sealing layer (304) and the lower sealing layer (306) correspond to the position of the protrusion (3051) so that the protrusion (3051) can pass through and expose the metal surface. The micro-flanges (3052) on both sides of the conductive core (305) in the width direction are protrusions that are higher than the surface of the metal core. When the rubber is vulcanized, they are embedded in the side of the sealing layer and hold the sealing layer from the width direction, restricting the sealing layer from moving laterally along the metal core. The positioning point (3055) on the surface of the conductive core (305) is an inwardly concave micro-pit. When the rubber flows into the pit during vulcanization and cools, it forms a mechanical riveting to prevent the sealing layer and the metal core from shifting relative to each other during vibration and thermal expansion. Step 2: Fasten the battery cover (301) so that the upper flange (302) is aligned and pressed onto the three-core sealing strip. The initial positioning is completed by the clamping part (2). The micro-arc (3056) at the top of the protruding edge (3051) is a rounded transition to avoid the sharp edge pressing into the flange surface and causing indentation. At the same time, it ensures that the contact area between the protruding edge (3051) and the flange is stable and the pressure is evenly distributed. Step 3: Start the roller welding machine (1). The roller moves along the flange track and applies pressure. Welding current is applied synchronously. The current preferentially passes through the middle conductive core (305) to form a circuit. The uniformly distributed groove (3058) between the two protruding ridges (3051) is a shallow groove that does not penetrate through. This increases the resistance at this position and forces the current to be evenly distributed to the two protruding ridges (3051) to avoid the current of a single protruding ridge (3051) being too large and burning through, or the current of the other ridge being insufficient and not fused. Step 4: The coarse tooth surface layer (3059) on the surface of the protruding ridge (3051) has a micro-pointed tooth structure. When pressure is applied, the points first pierce the dense oxide film on the flange surface, so that the protruding ridge (3051) can directly contact the flange base metal, reduce the contact resistance, and avoid the poor welding caused by the oxide film. Step 5: The protruding ridge (3051) fuses with the upper flange (302) and the lower flange (303) to form a double-channel continuous internal weld nugget. The compensation protrusion (3057) at the corner of the sealing strip is a micro-protrusion that is higher than the straight section protruding ridge (3051). This compensates for the decrease in current density caused by the small contact area of the roller at the corner and insufficient pressure, ensuring that the size of the weld nugget at the corner is consistent with that of the straight section. During the welding process, the heat is concentrated in the conductive core (305) area. The main stress groove (3053) and the secondary stress groove (3054) are... The cross-grid shallow grooves provide deformation space for the thermal expansion of the metal core, preventing the sealing layer from cracking due to thermal expansion and contraction. At the same time, they increase the bonding area between the rubber and the metal core to prevent delamination. The micro-flange (3052) also prevents the squeezed rubber from flowing to the contact surface of the ridge (3051), preventing the rubber from being separated between the ridge (3051) and the flange, thus preventing insulation. The upper sealing layer (304) and the lower sealing layer (306) are only softened by heat but not burned or carbonized. At the same time, they form a barrier around the welding area to prevent welding spatter from entering the interior of the housing. Step 6: After the entire circle welding is completed, maintain pressure and cool. After the internal molten core is completely solidified, release the clamp (2). The upper sealing layer (304) and the lower sealing layer (306) rely on their own elastic rebound to tightly adhere to the flange surface to form a double elastic seal, which together with the internal double metal molten core constitutes a multi-composite sealing structure.