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CN-122017633-A - Resistance testing method, device and system

CN122017633ACN 122017633 ACN122017633 ACN 122017633ACN-122017633-A

Abstract

The invention discloses a method, a device and a system for testing resistance. The method comprises the steps of obtaining an initial calculation model, wherein the initial calculation model can simulate the electrical performance of a mechanical part, the initial calculation model comprises a portion with the electrical conductivity to be determined, obtaining measured resistance parameters of the portion with the electrical conductivity to be determined, which are obtained by actually measuring probes of a resistance meter when the probes are placed at preset positions on two sides of the portion with the electrical conductivity to be determined, simulating in the initial calculation model by adopting a measurement method which is the same as that of the actual measurement to obtain simulated resistance parameters of the portion with the electrical conductivity to be determined, adjusting the material properties of the portion with the electrical conductivity to be determined of the mechanical part until the difference between the simulated resistance parameters and the measured resistance parameters is smaller than a set threshold value to determine an optimized calculation model, and conducting electrical performance simulation on the mechanical part in the optimized calculation model to obtain the resistance value of the portion with the electrical conductivity to be determined of the mechanical part, so that the accuracy of resistance test is improved.

Inventors

  • JIANG GUANGSEN
  • LIU ZHIMIN

Assignees

  • 北京车和家汽车科技有限公司

Dates

Publication Date
20260512
Application Date
20241112

Claims (12)

  1. 1. A method for testing a resistance value, the method comprising: acquiring an initial calculation model, wherein the initial calculation model can simulate the electrical properties of a mechanical part and comprises a part with conductivity to be defined; When probes of a resistance meter are placed at preset positions on two sides of the portion to be determined of the conductivity, actually measured resistance parameters of the portion to be determined of the conductivity of the mechanical part are obtained; Adopting a measurement method which is the same as actual measurement, carrying out simulation in the initial calculation model to obtain a simulation resistance parameter containing a to-be-determined part of the conductivity of the mechanical part, and adjusting the material property of the to-be-determined part of the conductivity of the mechanical part until the difference between the simulation resistance parameter and the actually measured resistance parameter is smaller than a set threshold value so as to determine an optimized calculation model; and performing electrical performance simulation on the mechanical part in the optimization calculation model to obtain the resistance value of the part to be determined of the conductivity of the mechanical part.
  2. 2. The method according to claim 1, wherein the portion to be defined of the conductivity of the mechanical part includes a welding area; when the probes of the resistance meter are placed at preset positions on two sides of the portion to be determined of the conductivity, actually measured resistance parameters of the portion to be determined of the conductivity of the mechanical part are obtained, and the method comprises the following steps: The first group of probes and the second group of probes of the resistance meter are respectively placed at two sides of a welding area of the mechanical part, and actually measured resistance parameters comprising the welding area are obtained; and in the step of determining an optimal computational model, adjusting material properties of the weld region.
  3. 3. The method for testing the resistance value according to claim 2, wherein the mechanical part is a mechanical part of an electric core, and the mechanical part comprises a pole at the top, a riveting block riveted on the outer edge of the top of the pole, a switching sheet at the bottom, a first welding area between the pole and the switching sheet and a second welding area at the bottom of the switching sheet, wherein the first welding area and the second welding area are to-be-determined parts of the conductivity of the mechanical part; the first group of probes and the second group of probes of the resistance meter are respectively placed at two sides of a welding area of the mechanical piece, actually measured resistance parameters including the welding area are obtained, and the method comprises the following steps: placing a first group of probes of the resistance meter on the top of the polar post or the top of the riveting block, placing a second group of probes of the resistance meter on the bottom of the switching sheet, and obtaining actually measured resistance parameters comprising the first welding area through actual measurement; And/or placing a first group of probes of the resistance meter on the top of the polar post or the top of the riveting block, and placing a second group of probes of the resistance meter on the bottom of the second welding area, wherein the measured resistance parameters comprising the first welding area and the second welding area are obtained through actual measurement.
  4. 4. A method of testing a resistance value according to claim 3, wherein the first welding region is a laser welding region or an ultrasonic welding region; and/or the second welding area is a laser welding area or an ultrasonic welding area.
  5. 5. The method for testing a resistance value according to any one of claims 2 to 4, wherein the mechanical member is a positive mechanical member, the first set of probes is positive probes, and the second set of probes is negative probes; Or the mechanical part is a negative mechanical part, the first group of probes are negative probes, and the second group of probes are positive probes.
  6. 6. The method for testing a resistance value according to claim 1, wherein the step of obtaining the measured resistance parameter of the portion to be determined of the conductivity of the mechanical part obtained by performing actual measurement when the probes of the resistance meter are placed at preset positions on both sides of the portion to be determined of the conductivity comprises: and aiming at the measurement of the same part in the mechanical part, placing probes of the resistance meter on at least two groups of preset positions, and respectively carrying out actual measurement to obtain at least two actually measured resistance parameters of the same part of the mechanical part.
  7. 7. The method according to claim 6, wherein the simulating in the initial calculation model by using the same measurement method as the actual measurement to obtain a simulated resistance parameter including the to-be-determined portion of the electrical conductivity of the mechanical part, and adjusting the material property of the to-be-determined portion of the electrical conductivity of the mechanical part until the difference between the simulated resistance parameter and the measured resistance parameter is less than a set threshold value, to determine an optimized calculation model, comprises: For the measurement of the same part in the mechanical part, adopting the same measurement method as the actual measurement, respectively carrying out simulation in the initial calculation model to obtain simulation resistance parameters comprising the same part of the mechanical part, and adjusting the material properties of the same part of the mechanical part until the difference between each simulation resistance parameter and the corresponding actual measurement resistance parameter is smaller than the set threshold; and carrying out statistical calculation on the material properties optimized for each time to obtain the optimal material properties so as to determine an optimal calculation model.
  8. 8. The method for testing the resistance according to claim 1, wherein the step of performing the electrical performance simulation on the mechanical part in the optimization calculation model to obtain the resistance of the portion to be defined of the electrical conductivity of the mechanical part includes: in the optimization calculation model, giving current and ground planes to the mechanical part; and obtaining the resistance value of the part of the mechanical part with the electric conductivity to be determined by extracting the electric parameters of the part of the mechanical part with the electric conductivity to be determined, wherein the electric parameters comprise voltage, current density and/or heating value.
  9. 9. The method for testing the resistance value according to claim 1, wherein when the electrical performance of the mechanical part is simulated in the optimization calculation model to obtain the resistance value of the portion to be defined of the electrical conductivity of the mechanical part, further comprising: and obtaining the independent resistance value of each part of the mechanical part and/or the total resistance value of the mechanical part.
  10. 10. The method for testing a resistance value according to claim 1, wherein the obtaining an initial calculation model includes: a three-dimensional scanner is adopted, and the initial calculation model is obtained by scanning the entity of the mechanical part; or modeling the mechanical part by adopting three-dimensional drawing software to obtain the initial calculation model.
  11. 11. The device for testing the resistance is characterized by being applied to a mechanical part of an electric core, and comprises: the model acquisition module is used for acquiring an initial calculation model, wherein the initial calculation model can simulate the electrical performance of the mechanical part and comprises a part with conductivity to be defined; The measured value acquisition module is used for acquiring measured resistance parameters of the to-be-determined conductivity part of the mechanical part obtained by actual measurement when probes of the resistance meter are placed at preset positions on two sides of the to-be-determined conductivity part; The model optimization module is used for simulating in the initial calculation model by adopting a measurement method which is the same as that of actual measurement to obtain a simulation resistance parameter containing a to-be-determined part of the conductivity of the mechanical part, and adjusting the material property of the to-be-determined part of the conductivity of the mechanical part until the difference between the simulation resistance parameter and the actually measured resistance parameter is smaller than a set threshold value so as to determine an optimized calculation model; And the resistance value determining module is used for carrying out electrical performance simulation on the mechanical part in the optimization calculation model to obtain the resistance value of the part to be determined of the conductivity of the mechanical part.
  12. 12. The resistance testing system is characterized by comprising a resistance meter and a computer, wherein the resistance meter is used for measuring measured resistance parameters of all parts of the mechanical part, and the computer comprises: at least one processor, and A memory communicatively coupled to the at least one processor, wherein, The memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the method of testing resistance values of any one of claims 1-10.

Description

Resistance testing method, device and system Technical Field The invention relates to the technical field of new energy, in particular to a method, a device and a system for testing resistance. Background Along with the rapid development of new energy industry, the electric automobile is coming to have a high-speed growth period, and the lithium ion battery is used as a core component of the electric automobile and has undergone several technical iterations. But is limited by the energy density of lithium battery materials, the cruising mileage of the electric automobile is difficult to realize great breakthrough, and the problem of mileage anxiety of the electric automobile is always caused. In the prior art, the problem of mileage anxiety can be alleviated by adopting a mode of improving the charging multiplying power and accelerating the energy supplementing speed. With the increase of the charging rate, the temperature of the battery cell and the battery pack rapidly rises in a short period. The heating value of the battery cell in the charging process can be reduced by optimizing the internal resistance of the battery cell, so that the battery cell is in a safe temperature working area. The internal resistance of the battery cell comprises an ohmic internal resistance and an electrochemical reaction internal resistance, the resistance of the mechanical part occupies a relatively large proportion in the ohmic internal resistance, and the heat generation of the battery cell can be reduced by reducing the resistance of the mechanical part. However, there are portions of the mechanical part where the resistivity is ambiguous, making the resistance test of the mechanical part inaccurate. Disclosure of Invention The invention provides a method, a device and a system for testing resistance, which are used for improving the accuracy of resistance test of mechanical parts of an electric core. According to one aspect of the invention, a method for testing resistance is provided, which is applied to a mechanical part of an electric core, and comprises the following steps: acquiring an initial calculation model, wherein the initial calculation model can simulate the electrical properties of the mechanical part and comprises a part with conductivity to be defined; When probes of a resistance meter are placed at preset positions on two sides of the portion to be determined of the conductivity, actually measured resistance parameters of the portion to be determined of the conductivity of the mechanical part are obtained; Adopting a measurement method which is the same as actual measurement, carrying out simulation in the initial calculation model to obtain a simulation resistance parameter containing a to-be-determined part of the conductivity of the mechanical part, and adjusting the material property of the to-be-determined part of the conductivity of the mechanical part until the difference between the simulation resistance parameter and the actually measured resistance parameter is smaller than a set threshold value so as to determine an optimized calculation model; and performing electrical performance simulation on the mechanical part in the optimization calculation model to obtain the resistance value of the part to be determined of the conductivity of the mechanical part. Optionally, the portion of the mechanical part whose conductivity is to be defined comprises a welding region; when the probes of the resistance meter are placed at preset positions on two sides of the portion to be determined of the conductivity, actually measured resistance parameters of the portion to be determined of the conductivity of the mechanical part are obtained, and the method comprises the following steps: The first group of probes and the second group of probes of the resistance meter are respectively placed at two sides of a welding area of the mechanical part, and actually measured resistance parameters comprising the welding area are obtained; and in the step of determining an optimal computational model, adjusting material properties of the weld region. Optionally, the mechanical piece comprises a pole at the top, a riveting block riveted on the outer edge of the top of the pole, a switching piece at the bottom, a first welding area between the pole and the switching piece and a second welding area at the bottom of the switching piece, wherein the first welding area and the second welding area are to-be-determined parts of the conductivity of the mechanical piece; the first group of probes and the second group of probes of the resistance meter are respectively placed at two sides of a welding area of the mechanical piece, actually measured resistance parameters including the welding area are obtained, and the method comprises the following steps: placing a first group of probes of the resistance meter on the top of the polar post or the top of the riveting block, placing a second group of probes of the resistance meter on t