CN212845609U - Insulation resistance testing device - Google Patents
Insulation resistance testing device Download PDFInfo
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- CN212845609U CN212845609U CN202022223939.8U CN202022223939U CN212845609U CN 212845609 U CN212845609 U CN 212845609U CN 202022223939 U CN202022223939 U CN 202022223939U CN 212845609 U CN212845609 U CN 212845609U
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Abstract
The utility model relates to the field of power batteries, and provides an insulation resistance testing device which is used for testing the insulation detection function of a battery management system of a power battery pack and comprises an insulation resistance value detection circuit; the insulation resistance detection circuit comprises a first switch, an annular sliding rheostat and a second switch which are sequentially connected, wherein the first switch is connected with a high-voltage positive electrode or a high-voltage negative electrode of the battery pack, and the second switch is connected with a low-voltage ground; the annular sliding rheostat comprises an annular insulating sleeve, a resistance wire and a metal sliding sheet, wherein the resistance wire is uniformly wound on the outer wall of the annular insulating sleeve, and the metal sliding sheet is in contact with the resistance wire and can slide along the annular insulating sleeve. The utility model discloses utilize mechanical structure to replace manual mode to adjust the resistance of annular slide rheostat, realize testing BMS's insulation detection function under different insulation resistance, improved efficiency of software testing.
Description
Technical Field
The utility model relates to a power battery field specifically relates to an insulation resistance testing arrangement.
Background
The safety of the power battery of the electric automobile is an important index of the safety of the whole automobile, wherein the insulation performance detection of the power battery is an essential process in the safety test of the power battery. When measuring the insulation precision detection function of a Battery Management System (BMS), it is necessary to connect insulation resistors having different resistances between a main positive/main negative high-voltage terminal of a Battery pack and the ground, and to simulate the insulation state between the high-voltage terminal of the Battery pack and a Battery pack case, so as to verify whether the insulation detection function of the BMS is normal under different insulation resistors.
At present, in the battery pack level insulation precision test, the selected external resistor is formed by manually splicing resistors with different sizes, the spliced resistance value needs to be measured and recorded by a universal meter, a large amount of time is consumed, and the test efficiency is low; moreover, errors may be introduced into the manual splicing resistance value, and the power battery pack is in the state of an external resistor for a long time in the test process, so that the insulation performance of the battery system can be reduced.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides an aim at provides an insulation resistance testing arrangement to improve efficiency of software testing.
In order to achieve the above object, an embodiment of the present invention provides an insulation resistance testing apparatus for testing an insulation detection function of a battery management system of a power battery pack, where the insulation resistance testing apparatus includes an insulation resistance value detection circuit; the insulation resistance detection circuit comprises a first switch, an annular sliding rheostat and a second switch which are sequentially connected, wherein the first switch is connected with a high-voltage positive electrode or a high-voltage negative electrode of the battery pack, and the second switch is connected with a low-voltage ground; the annular sliding rheostat comprises an annular insulating sleeve, a resistance wire and a metal sliding sheet, wherein the resistance wire is uniformly wound on the outer wall of the annular insulating sleeve, and the metal sliding sheet is in contact with the resistance wire and can slide along the annular insulating sleeve.
Optionally, the insulation resistance testing device further comprises a power assembly; the power assembly is connected with the metal slip sheet and used for driving the metal slip sheet to slide along the annular insulating sleeve.
Optionally, the power assembly comprises a steering engine; one end of the metal slip sheet is fixedly connected with an output shaft of the steering engine, and the other end of the metal slip sheet slides along the annular insulating sleeve along with the rotation of the output shaft of the steering engine.
Optionally, the output shaft of the steering engine is coated with an insulating material.
Optionally, the insulation resistance testing device further includes a self-checking circuit, the self-checking circuit includes a third switch, a power supply and a constant resistor, a first end of the third switch is connected to the positive electrode of the power supply, a second end of the third switch is connected to the first end of the annular sliding rheostat, a first end of the constant resistor is connected to the negative electrode of the power supply, and a second end of the constant resistor is connected to the second end of the annular sliding rheostat.
Optionally, the resistance value of the annular sliding rheostat ranges from 0M omega to 1M omega.
The embodiment of the utility model provides an insulation resistance testing arrangement utilizes mechanical structure to replace manual mode to adjust the resistance of annular slide rheostat, realizes testing BMS's insulation detection function under different insulation resistance, has improved efficiency of software testing. In addition, the insulation resistance testing device is also provided with a self-checking circuit, and the resistance value of the annular slide rheostat is recovered through the self-checking circuit, so that the error between the current resistance value of the annular slide rheostat and the resistance value required by actual testing can be conveniently found, the error can be conveniently adjusted in time, and the testing accuracy can be ensured.
Other features and advantages of embodiments of the present invention will be described in detail in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention, but do not constitute a limitation of the embodiments of the invention. In the drawings:
fig. 1 is a schematic circuit diagram of an insulation resistance testing apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram (top view) of an annular slide rheostat and a power assembly of an insulation resistance testing device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram (side view) of a ring-shaped sliding rheostat and a power assembly of an insulation resistance testing device according to an embodiment of the present invention.
Description of the reference numerals
1-annular insulating sleeve, 2-resistance wire, 3-metal sliding sheet,
4-steering engine, 5-output shaft.
Detailed Description
The following describes in detail embodiments of the present invention with reference to the accompanying drawings. It is to be understood that the description herein is only intended to illustrate and explain embodiments of the present invention, and is not intended to limit embodiments of the present invention.
The terms "first" and "second" herein are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance. "connected" as used herein is intended to mean an electrical power connection or a signal connection between two components; "coupled" may be a direct connection between two elements, an indirect connection between two elements through an intermediary (e.g., a wire), or an indirect connection between three elements.
Fig. 1 is a schematic circuit diagram of an insulation resistance testing apparatus according to an embodiment of the present invention. As shown in fig. 1, the present embodiment provides an insulation resistance testing apparatus for testing an insulation detection function of a battery management system of a power battery pack, where the insulation resistance testing apparatus includes an insulation resistance value detecting circuit and a self-checking circuit. The insulation resistance detection circuit comprises a first switch K1, a ring-shaped sliding rheostat R1 and a second switch K2 which are sequentially connected, wherein the first switch K1 is connected with the high-voltage positive pole or the high-voltage negative pole of the battery pack, and the second switch K2 is connected with a low-voltage ground (such as-12V voltage). The self-checking circuit comprises a third switch K3, a power supply E and a constant resistor R2, wherein a first end of the third switch K3 is connected with the positive pole of the power supply E, a second end of the third switch K3 is connected with a first end of the ring-shaped sliding rheostat R1, a first end of the constant resistor R2 is connected with the negative pole of the power supply E, and a second end of the constant resistor R2 is connected with a second end of the ring-shaped sliding rheostat R1.
In this embodiment, the resistance range of the annular slide rheostat R1 is 0-1M Ω, which can satisfy the resistance range related to insulation detection of the power battery pack BMS.
Fig. 2 is a schematic structural diagram (top view) of an annular slide rheostat and a power assembly of an insulation resistance testing device according to an embodiment of the present invention; fig. 3 is a schematic structural diagram (side view) of a ring-shaped sliding rheostat and a power assembly of an insulation resistance testing device according to an embodiment of the present invention. As shown in fig. 2, the annular slide rheostat comprises an annular insulating sleeve 1, a resistance wire 2 and a metal sliding sheet 3. The resistance wire 2 is uniformly wound on the outer wall of the annular insulating sleeve 1, so that the insulation resistance values of the resistance wire per unit length are the same. The metal sliding sheet 3 is in contact with the resistance wire 2 and can slide along the annular insulating sleeve 1. The insulation resistance testing device further comprises a power assembly, wherein the power assembly is connected with the metal sliding sheet 3 and used for driving the metal sliding sheet 3 to slide along the annular insulating sleeve 1. As shown in fig. 3, the power assembly includes a small steering gear 4; one end of the metal sliding sheet 3 is fixedly connected with the output shaft 5 of the steering engine 4, and the other end of the metal sliding sheet 3 slides along the annular insulating sleeve 1 along with the rotation of the output shaft 5 of the steering engine 4. And an output shaft 5 of the steering engine 4 is coated with an insulating material so as to ensure the insulation property.
Because the resistance wire 2 is uniformly wound on the annular insulating sleeve 1, the distance from the metal sliding sheet 3 to the starting end of the resistance wire 2 and the insulation resistance value of the annular sliding rheostat R1 have a linear relation, and then the resistance value of the annular sliding rheostat R1 connected to the insulation resistance value detection circuit and the distance of the steering engine 4 pulling the metal sliding sheet 3 to move have a corresponding relation. Since the rotation speed of the steering engine 4 is constant, the resistance value of the annular slide rheostat R1 connected to the insulation resistance value detection circuit is related to the working (rotation) time of the steering engine 4.
The corresponding relation between the resistance value of the annular slide rheostat R1 connected to the insulation resistance value detection circuit and the working time of the steering engine 4 is as follows: and T is l/V, wherein T is the working time when the resistance value of the test point is adjusted by the steering engine, l is the movement distance when the resistance value of the test point is adjusted by the steering engine, and V is the constant rotating speed when the steering engine works.
Since l ═ R1/(R0L) wherein R1The resistance value of the test point (namely the resistance value of the annular slide rheostat connected to the insulation resistance value detection circuit); r0The total resistance value of the resistance wire of the annular slide rheostat; l is the total length of the resistance wire of the annular slide rheostat.
From the above formula, it can be found that T ═ R1*L)/(R0V). Therefore, the resistance value R of the annular sliding rheostat connected to the insulation resistance value detection circuit can be determined by determining the working time T of the steering engine1。
In this embodiment, the ring-shaped slide rheostat R1 realizes different resistance values through the movement of the metal sliding sheet 3, and the movement of the metal sliding sheet 3 is driven by the forward and reverse rotation of the steering engine 4, that is, the ring-shaped slide rheostat R1 realizes external resistance values of different sizes required by the battery pack level insulation precision test by using the mechanical movement of the steering engine 4 instead of manual operation.
When the insulation resistance testing device of the embodiment is used for testing, the whole high-voltage wire harness is connected with the battery pack, one interface (corresponding to the first switch K1) of the insulation resistance testing device is connected to the high-voltage positive electrode or the high-voltage negative electrode of the battery pack, and the other interface (corresponding to the second switch K2) of the insulation resistance testing device is connected to a low-voltage ground (for example, -12V voltage), so that the condition that the insulation resistance is connected between the high-voltage end of the battery pack and the shell is simulated. When the insulation resistance testing device carries out insulation self-checking, the first switch K1 and the second switch K2 are disconnected, the third switch K3 is closed, and the resistor connected into the self-checking circuit loop comprises a constant resistor R2 (the resistance value is R2)2) And a ring-shaped slide rheostat R1 (resistance R)1) Collecting voltage V of annular slide rheostat1Whereas the power supply E is known, according to ohm's law: E/(R)2+R1)＝V1/R1So as to obtain the resistance value of the annular slide rheostat: r1＝R2*V1/(E-V1). The resistance value of the annular slide rheostat is recovered through the self-checking circuit, so that the error between the current resistance value of the annular slide rheostat and the resistance value required by actual test can be conveniently found, the error can be conveniently adjusted in time, and the test accuracy is ensured.
The embodiment of the utility model provides an insulation resistance testing arrangement utilizes mechanical structure to replace manual mode to adjust the resistance of annular slide rheostat, realizes testing BMS's insulation detection function under different insulation resistance, has improved efficiency of software testing. In addition, the insulation resistance testing device is also provided with a self-checking circuit, and the resistance value of the annular sliding rheostat is recovered through the self-checking circuit, so that errors can be adjusted in time, and the testing accuracy is guaranteed.
The above describes in detail optional implementation manners of embodiments of the present invention with reference to the accompanying drawings, however, the embodiments of the present invention are not limited to the details in the above implementation manners, and in the technical concept scope of the embodiments of the present invention, it is possible to perform various simple modifications on the technical solutions of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.
Claims (6)
1. An insulation resistance testing device is used for testing the insulation detection function of a battery management system of a power battery pack and is characterized by comprising an insulation resistance value detection circuit;
the insulation resistance detection circuit comprises a first switch, an annular sliding rheostat and a second switch which are sequentially connected, wherein the first switch is connected with a high-voltage positive electrode or a high-voltage negative electrode of the battery pack, and the second switch is connected with a low-voltage ground;
the annular sliding rheostat comprises an annular insulating sleeve, a resistance wire and a metal sliding sheet, wherein the resistance wire is uniformly wound on the outer wall of the annular insulating sleeve, and the metal sliding sheet is in contact with the resistance wire and can slide along the annular insulating sleeve.
2. The insulation resistance testing apparatus according to claim 1, further comprising a power assembly;
the power assembly is connected with the metal slip sheet and used for driving the metal slip sheet to slide along the annular insulating sleeve.
3. The insulation resistance testing device of claim 2, wherein the power assembly comprises a steering engine;
one end of the metal slip sheet is fixedly connected with an output shaft of the steering engine, and the other end of the metal slip sheet slides along the annular insulating sleeve along with the rotation of the output shaft of the steering engine.
4. The insulation resistance testing device of claim 3, wherein the output shaft of the steering engine is coated with an insulating material.
5. The insulation resistance test device according to claim 1, further comprising a self-test circuit including a third switch, a power source, and a constant resistor, a first end of the third switch being connected to a positive terminal of the power source, a second end of the third switch being connected to a first end of the ring-shaped sliding rheostat, a first end of the constant resistor being connected to a negative terminal of the power source, and a second end of the constant resistor being connected to a second end of the ring-shaped sliding rheostat.
6. The insulation resistance testing device according to claim 1, wherein the resistance value of the annular slide rheostat is in a range of 0-1M Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022223939.8U CN212845609U (en) | 2020-09-30 | 2020-09-30 | Insulation resistance testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022223939.8U CN212845609U (en) | 2020-09-30 | 2020-09-30 | Insulation resistance testing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212845609U true CN212845609U (en) | 2021-03-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022223939.8U Active CN212845609U (en) | 2020-09-30 | 2020-09-30 | Insulation resistance testing device |
Country Status (1)
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|---|---|
| CN (1) | CN212845609U (en) |
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- 2020-09-30 CN CN202022223939.8U patent/CN212845609U/en active Active
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