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CN-122000215-A - Capacitive double-layer copper bar creepage distance fixing process for new energy automobile

CN122000215ACN 122000215 ACN122000215 ACN 122000215ACN-122000215-A

Abstract

The invention discloses a double-layer copper bar creepage distance fixing process for a capacitor of a new energy automobile, which comprises the following steps of S1, forming a plurality of positioning and mounting holes at a first copper bar, S2, placing an isolation supporting pad piece at the positioning and mounting holes of the first copper bar, then placing a second copper bar on the isolation supporting pad piece, and placing the copper bar, the second copper bar and the isolation supporting pad piece into an injection mold, wherein the copper bar assembly is placed into the injection mold, the injection mold is used for injecting a main body plastic piece, the main body of the copper bar assembly is coated in the main body plastic piece, and a copper pin connected with the copper bar assembly is exposed out of the main body plastic piece. According to the invention, the first copper bar and the second copper bar are separated by the isolation supporting pad, so that the situation that the distance between the first copper bar and the second copper bar is too small due to bending of the copper bar during injection molding can be prevented, the first copper bar and the second copper bar are ensured to have sufficient creepage distance, and potential safety hazards such as short circuit and electric leakage are avoided.

Inventors

  • LI PENGCHENG

Assignees

  • 东莞中兴瑞电子科技有限公司

Dates

Publication Date
20260508
Application Date
20260409

Claims (7)

  1. 1. A technology for fixing creepage distance of a capacitor double-layer copper bar for a new energy automobile is characterized by comprising the following steps: s1, a plurality of positioning and mounting holes (12) are formed in a first copper bar (10); S2, placing an isolation support pad (30) in the positioning mounting hole (12) of the first copper bar (10), and then placing a second copper bar (20) on the isolation support pad (30), wherein the upper side of the isolation support pad (30) is in contact with the second copper bar (20), the lower side of the isolation support pad (30) is in contact with the first copper bar (10), and the first copper bar (10), the second copper bar (20) and the isolation support pad (30) jointly form a copper bar assembly; s3, placing the copper bar assembly into an injection mold, injecting a main body plastic part (40) by the injection mold, coating the main body of the copper bar assembly in the main body plastic part (40), and exposing the copper connecting feet of the copper bar assembly to the main body plastic part (40).
  2. 2. The process for fixing the creepage distance of the double-layer copper bars of the capacitor of the new energy automobile according to claim 1, wherein the isolation supporting pad (30) is provided with a plug-in column part (31), a supporting part (32) is arranged on the upper side of the plug-in column part (31), and the supporting part (32) is in a round table shape.
  3. 3. The process for fixing the creepage distance of the capacitor double-layer copper bar of the new energy automobile according to claim 2, wherein the edge of the vertical section of the isolation supporting pad (30) comprises a first creepage distance (301), a second creepage distance (302) and a third creepage distance (303), and the sum of the first creepage distance (301), the second creepage distance (302) and the third creepage distance (303) is larger than 5mm.
  4. 4. The process for fixing the creepage distance of the double-layer copper bars of the capacitor of the new energy automobile according to claim 1 or 2, wherein the isolating support pad (30) is made of PPS.
  5. 5. The capacitive double-layer copper bar creepage distance fixing process for the new energy automobile, according to claim 1, is characterized in that the distance between the first copper bar (10) and the second copper bar (20) is 1.5mm.
  6. 6. The process for fixing the creepage distance of the capacitor double-layer copper bar of the new energy automobile according to claim 1, wherein the surface, which is in contact with the isolation supporting pad (30), of the first copper bar (10) is a first supporting surface (11), the surface, which is in contact with the isolation supporting pad (30), of the second copper bar (20) is a second supporting surface (21), and the planeness of the first supporting surface (11) and the second supporting surface (21) is smaller than 0.1.
  7. 7. The process for fixing the creepage distance of the double-layer copper bars of the capacitor of the new energy automobile according to claim 1, wherein the leakage current of the first copper bar (10) and the second copper bar (20) is not more than 0.6mA under the condition of bearing a high voltage of 3000Vac for 30 seconds.

Description

Capacitive double-layer copper bar creepage distance fixing process for new energy automobile Technical Field The invention relates to the technical field related to new energy automobile electric technology, in particular to a capacitor double-layer copper bar creepage distance fixing process for a new energy automobile. Background In the design and manufacture of the high-voltage capacitor assembly of the new energy automobile, the double-layer copper bar is used as a core conductive carrier, and the double requirements of high-voltage insulation safety and structural stability are simultaneously met. The capacitor component of the new energy automobile has high working voltage, has a strict standard on creepage distance and insulating property, and has the advantages that the high voltage of 3000Vac needs to be born between T+ and T-electrode for 30 seconds, and the leakage current is not more than 0.6mA. Although basic insulation can be realized by the traditional double-layer high-temperature-resistant insulating paper isolation scheme, the problem of structural deformation in injection molding cannot be solved, once the copper bar is displaced or deformed, the creepage distance is directly insufficient, potential safety hazards such as short circuit and electric leakage are caused, and the stability of a whole vehicle high-voltage electrical system is threatened. In addition, the traditional process adopts an integral molding technology that an upper copper bar and a lower copper bar are embedded into a die at an interval of 1.5 mm. In the injection molding process, the impact force of the high-pressure melt is very easy to lead the thin copper bars to be bent, position offset, damage the surface integrity of the copper bars and the like, thereby reducing the conductive efficiency, even changing the preset distance between the copper bars and directly breaking through the insulation safety threshold between the double-layer copper bars. Therefore, we propose a capacitor double-layer copper bar creepage distance fixing process for new energy automobiles. Disclosure of Invention The invention aims to overcome the defects of the prior art and provides a capacitor double-layer copper bar creepage distance fixing process for a new energy automobile. In order to achieve the purpose, the invention adopts the following technical scheme that the double-layer copper bar creepage distance fixing process for the capacitor of the new energy automobile comprises the following steps: S1, a plurality of positioning and mounting holes are formed in a first copper bar; S2, placing an isolation supporting pad piece in the positioning mounting hole of the first copper bar, placing a second copper bar on the isolation supporting pad piece, wherein the upper side of the isolation supporting pad piece is abutted against the second copper bar, the lower side of the isolation supporting pad piece is abutted against the first copper bar, and the first copper bar, the second copper bar and the isolation supporting pad piece jointly form a copper bar assembly; S3, placing the copper bar assembly into an injection mold, injecting a main body plastic part by the injection mold, coating the main body of the copper bar assembly in the main body plastic part, and exposing the copper connecting pins of the copper bar assembly to the main body plastic part. Further stated, the isolation support pad is provided with an insertion column portion, a support portion is arranged on the upper side of the insertion column portion, and the support portion is in a circular truncated cone shape. Further stated, the edge of the vertical section of the isolation support pad piece comprises a first creepage distance, a second creepage distance and a third creepage distance, and the sum of the first creepage distance, the second creepage distance and the third creepage distance is larger than 5mm. Further described, the isolation support pad is made of PPS. Further stated, the spacing between the first copper bar and the second copper bar is 1.5mm. Further stated, the surface of the first copper bar, which is in contact with the isolation supporting pad, is a first supporting surface, the surface of the second copper bar, which is in contact with the isolation supporting pad, is a second supporting surface, and the flatness of the first supporting surface and the second supporting surface is less than 0.1. Further stated, the first copper bar and the second copper bar have leakage currents of not more than 0.6mA when subjected to a high voltage of 3000Vac for 30 seconds. The invention has the beneficial effects that the first copper bar and the second copper bar are separated by adopting the isolation supporting pad piece, so that the too small distance between the first copper bar and the second copper bar caused by bending of the copper bar during injection molding can be prevented, the first copper bar and the second copper bar are ensured to have