CN-224216782-U - Grounding spring contact resistance measuring device

CN224216782UCN 224216782 UCN224216782 UCN 224216782UCN-224216782-U

Abstract

The utility model discloses a contact resistance measuring device of a grounding spring piece, which comprises a first conductive piece, a second conductive piece, a limiting piece, a first measuring line and a second measuring line, wherein the first conductive piece and the second conductive piece are used for abutting against the grounding spring piece from two sides of the grounding spring piece to compress the grounding spring piece, the limiting piece is arranged between the first conductive piece and the second conductive piece and used for limiting the distance between the first conductive piece and the second conductive piece to control the compression amount of the grounding spring piece, the first measuring line is connected with the first conductive piece, the second measuring line is connected with the second conductive piece, and the first measuring line and the second measuring line are used for measuring the resistance of the grounding spring piece. The utility model can accurately measure the contact resistance value of the grounding spring plate under a specific compression amount, and improves the measurement accuracy of the contact resistance of the grounding spring plate.

Inventors

LI MOZHI
JIN YONGMING
XIE WEIQI
LI HAOTIAN
ZHANG JINHENG
WANG JIUHUI
LI YUNHAI
YUAN TAO
Ruan Wanwei

Assignees

小米汽车科技有限公司

Dates

Publication Date: 20260508
Application Date: 20250519

Claims (19)

1. The utility model provides a ground connection shell fragment contact resistance measuring device which characterized in that includes: the first conductive piece and the second conductive piece are used for abutting against the grounding spring piece from two sides of the grounding spring piece to compress the grounding spring piece; The limiting piece is arranged between the first conductive piece and the second conductive piece and used for limiting the distance between the first conductive piece and the second conductive piece so as to control the compression amount of the grounding spring piece; The first measuring line is connected with the first conductive piece, the second measuring line is connected with the second conductive piece, and the first measuring line and the second measuring line are used for measuring the resistance of the grounding spring piece.
2. The device according to claim 1, wherein at least one of the first conductive member and the second conductive member is provided with a plurality of limiting holes having different depths and adapted to the limiting member, so as to adjust a distance between the first conductive member and the second conductive member by changing the cooperation of the limiting member with the different limiting holes.
3. The device for measuring contact resistance of a grounding spring as set forth in claim 2, wherein the limiting hole is a blind hole.
4. The device for measuring contact resistance of a grounding spring according to claim 2, wherein the limiting hole is a threaded hole, the limiting member is a threaded rod, and the threaded rod cooperates with the threaded hole to adjust the distance between the first conductive member and the second conductive member by rotating the threaded rod.
5. The device for measuring contact resistance of a grounding spring according to claim 1, further comprising a first fixing frame and a second fixing frame, wherein the first conductive member is disposed on the first fixing frame, the second conductive member is disposed on the second fixing frame, and the first fixing frame is connected with the second fixing frame through a first fastener.
6. The device for measuring contact resistance of a grounding spring according to claim 5, wherein the first fixing frame is provided with a first connecting threaded hole, the second fixing frame is provided with a second connecting threaded hole, the first fastening piece is a screw, and the screw is matched with the first connecting threaded hole and the second connecting threaded hole to connect the first fixing frame and the second fixing frame.
7. The device for measuring contact resistance of a grounding spring according to claim 6, wherein the limiting member is a sleeve, the sleeve is sleeved on the screw, a first end of the sleeve is abutted against the first fixing frame, and a second end of the sleeve is abutted against the second fixing frame so as to limit the distance between the first conductive member and the second conductive member.
8. The ground clip contact resistance measurement device of claim 7, wherein the sleeve includes a plurality of sleeve rings stacked one on top of the other to adjust a distance between the first conductive member and the second conductive member by changing the number of sleeve rings.
9. The device of claim 5, wherein a first electrical insulator is disposed between the first holder and the first conductive member, and/or And a second electric insulating piece is arranged between the second fixing frame and the second conductive piece.
10. The device for measuring contact resistance of grounding spring as set forth in claim 9, wherein a first stopper is provided on the first holder, the first electrical insulating member has a first stopper groove opened toward the first holder, a portion of the first stopper is fitted in the first stopper groove, and/or The second fixing frame is provided with a second limiting block, the second electric insulating piece is provided with a second limiting groove with an opening facing the second fixing frame, and part of the second limiting block is matched in the second limiting groove.
11. The device of claim 10, wherein the first electrical insulator has a third limit groove open to the first conductive member, at least a portion of the first conductive member being fitted in the third limit groove, and/or The second electrical insulator has a fourth spacing groove open to the second electrical conductor, and at least a portion of the second electrical conductor fits within the fourth spacing groove.
12. The device for measuring contact resistance of grounding spring as set forth in claim 11, further comprising a first pressing block and a second fastening member, wherein the first pressing block is connected to the first conductive member via the second fastening member, the first pressing block is press-fitted on the first stopper in a direction toward the first conductive member, a first electrically insulating sheet is provided between the first pressing block and the first stopper, and/or The grounding spring contact resistance measuring device further comprises a second pressing block and a third fastening piece, the second pressing block is connected with the second conductive piece through the third fastening piece, the second pressing block is pressed on the second limiting block along the direction facing the second conductive piece, and a second electric insulation sheet is arranged between the second pressing block and the second limiting block.
13. The device according to claim 12, wherein the first pressing block is provided with a first groove (1001) opened toward the first stopper, a portion of the first stopper is fitted into the first groove (1001), and/or The second pressing block is provided with a second groove with an opening facing the second limiting block, and part of the second limiting block is matched in the second groove.
14. The device of claim 13, wherein the first electrical insulator has a first hole for engaging the second fastener, and/or The second electrical insulator is provided with a second aperture that mates with the third fastener.
15. The ground clip contact resistance measurement device of claim 5, wherein the first measurement line comprises a first current line and a first voltage line, the second measurement line comprises a second current line and a second voltage line, the first voltage line and the second voltage line are used to measure a potential difference between the first conductive member and the second conductive member, and the first current line and the second current line are used to measure a current difference between the first conductive member and the second conductive member.
16. The device for measuring contact resistance of grounding spring as defined in claim 15, further comprising a first pressing plate and a fourth fastening member, wherein the first pressing plate is connected to the first conductive member through the fourth fastening member, and wherein the first pressing plate presses one ends of the first current wire and the first voltage wire against the first conductive member, and/or The grounding spring contact resistance measuring device further comprises a second pressing plate and a fifth fastening piece, the second pressing plate is connected with the second conductive piece through the fifth fastening piece, and one ends of the second current wire and the second voltage wire are in pressure connection with the second conductive piece through the second pressing plate.
17. The device for measuring contact resistance of grounding spring as set forth in claim 16, wherein a first sinking groove is provided on a surface of the first conductive member facing the first fixing frame, the first pressing plate is provided in the first sinking groove to press one end of the first current wire and the first voltage wire against a bottom surface of the first sinking groove, and/or The second conducting piece is provided with a second sinking groove towards the surface of the second fixing frame, and the second pressing plate is arranged in the second sinking groove so as to press one end of the second current wire and one end of the second voltage wire to the bottom surface of the second sinking groove.
18. The device of claim 9, wherein the first holder, the first electrical insulator, and the first conductive member are ring frames and have a peripheral contour adapted, and/or The second fixing frame, the second electric insulating piece and the second electric conducting piece are annular frames, and the peripheral outline of the second fixing frame, the second electric insulating piece and the second electric conducting piece are matched.
19. The device for measuring contact resistance of a grounding spring according to claim 9, further comprising a connecting plate and a fixing base, wherein the connecting plate is connected with the first fixing frame, a connecting piece used for being connected with a tensile and compression testing machine is arranged on the connecting plate, and the fixing base is connected with the second fixing frame.

Description

Grounding spring contact resistance measuring device Technical Field The utility model relates to the technical field of resistance measurement, in particular to a device for measuring contact resistance of a grounding spring plate. Background In a vehicle electric drive product, in order to prevent charge accumulation and electrostatic interference, a spring, which may also be referred to as a grounding spring, is often provided between two different housings of the electric drive product. In the installation process, the two shells can squeeze the grounding elastic sheet, so that the grounding elastic sheet is elastically abutted on the two shells, and the conduction between two different shells of the electric drive product is realized. Because the compression amount of the grounding spring piece can influence the contact state between the grounding spring piece and the shell, the compression amount of the grounding spring piece can influence the contact resistance between the grounding spring piece and the shell. In the related art, the compression amount of the grounding spring cannot be accurately controlled in the process of measuring the contact resistance of the grounding spring, so that the measurement accuracy of the contact resistance of the grounding spring is low. Disclosure of utility model The present utility model aims to solve at least one of the technical problems in the related art to some extent. Therefore, the utility model provides a device for measuring the contact resistance of the grounding spring plate. The device for measuring the contact resistance of the grounding spring plate comprises a first conductive piece, a second conductive piece, a limiting piece, a first measuring line and a second measuring line, wherein the first conductive piece and the second conductive piece are used for abutting against the grounding spring plate from two sides of the grounding spring plate to compress the grounding spring plate, the limiting piece is arranged between the first conductive piece and the second conductive piece and used for limiting the distance between the first conductive piece and the second conductive piece to control the compression amount of the grounding spring plate, the first measuring line is connected with the first conductive piece, the second measuring line is connected with the second conductive piece, and the first measuring line and the second measuring line are used for measuring the resistance of the grounding spring plate. Optionally, at least one of the first conductive member and the second conductive member is provided with a plurality of limiting holes having different depths and being adapted to the limiting member, so as to adjust the distance between the first conductive member and the second conductive member by changing the fit of the limiting member to the different limiting holes. Optionally, the limiting hole is a blind hole. Optionally, the limiting hole is a threaded hole, the limiting piece is a threaded rod, and the threaded rod is matched with the threaded hole to adjust the distance between the first conductive piece and the second conductive piece by rotating the threaded rod. Optionally, the device for measuring contact resistance of a grounding spring piece in the embodiment of the disclosure further includes a first fixing frame and a second fixing frame, the first conductive member is disposed on the first fixing frame, the second conductive member is disposed on the second fixing frame, and the first fixing frame is connected with the second fixing frame through a first fastener. Optionally, the first fixing frame is provided with a first connecting threaded hole, the second fixing frame is provided with a second connecting threaded hole, the first fastener is a screw rod, and the screw rod is matched with the first connecting threaded hole and the second connecting threaded hole to connect the first fixing frame and the second fixing frame. Optionally, the limiting part is a sleeve, the sleeve is sleeved on the screw, a first end of the sleeve is abutted against the first fixing frame, and a second end of the sleeve is abutted against the second fixing frame so as to limit the distance between the first conductive part and the second conductive part. Optionally, the sleeve includes a plurality of sleeve rings stacked in sequence to adjust a distance between the first conductive member and the second conductive member by changing the number of sleeve rings. Optionally, a first electrical insulator is provided between the first mount and the first conductive member, and/or a second electrical insulator is provided between the second mount and the second conductive member. Optionally, a first limiting block is arranged on the first fixing frame, the first electric insulating piece is provided with a first limiting groove with an opening facing the first fixing frame, a part of the first limiting block is matched in the first limiting groove