CN105911352B - Tester for measuring insulation resistance of power battery - Google Patents
Tester for measuring insulation resistance of power battery Download PDFInfo
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- CN105911352B CN105911352B CN201610227816.7A CN201610227816A CN105911352B CN 105911352 B CN105911352 B CN 105911352B CN 201610227816 A CN201610227816 A CN 201610227816A CN 105911352 B CN105911352 B CN 105911352B
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- 238000009413 insulation Methods 0.000 title claims abstract description 61
- 238000012360 testing method Methods 0.000 claims abstract description 52
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000009863 impact test Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000011076 safety test Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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Abstract
The invention discloses a tester for measuring the insulation resistance of a power battery, which is characterized by comprising: the testing unit comprises a relay assembly, a voltmeter and a first reference resistor, wherein a first pin of the testing unit is connected with the anode of the power battery to be tested, a second pin of the testing unit is connected with the cathode of the power battery to be tested, and a third pin of the testing unit is grounded; the control unit is used for controlling the on/off of the relay assembly so as to respectively acquire a first voltage, a second voltage and a reference voltage; the logic unit is used for acquiring the insulation resistance of the power battery to be tested according to the first voltage, the second voltage, the first reference voltage and the first reference resistance; and the display unit is used for displaying the insulation resistance of the power battery to be tested. The tester greatly simplifies the testing operation process and improves the working efficiency, thereby realizing the testing automation of the insulation resistance of the power battery.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a tester for measuring insulation resistance of a power battery.
Background
In order to avoid or reduce the potential safety hazard of the electric automobile, the safety and reliability of the electric automobile need to be verified comprehensively and reasonably. And the power battery system is used as a key part of the electric automobile and is indispensable to the test of the power battery system. The safety test standard GB/T31467.3-2015 of the battery system is provided in 5 months in 2015 in China, and 16 safety reliability test contents such as a vibration test, an impact test, a drop test, a turnover test, a simulation collision test, a squeezing test, a temperature impact test, a damp-heat cycle test, a seawater soaking test, an external fire test, a salt spray test, a high altitude test, over-temperature protection, short-circuit protection, overcharge protection, overdischarge protection and the like are related to the safety test standard GB/T31467.3-2015. The standard adopted by the current test battery system insulation resistance value is GB/T18384.1-2015, and specifically, insulation resistance measurement is carried out on a power battery system by connecting resistors with corresponding resistance values in parallel in a circuit.
However, loose parallel resistor connections often result in test errors during each test. Meanwhile, the voltage collected by the voltmeter needs to be recorded manually, and then the resistance value is calculated, so that the operation is complex and the efficiency is low.
Therefore, improvements are needed in the related art.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the invention aims to provide a tester for measuring the insulation resistance of a power battery.
In order to achieve the above object, an embodiment of the present invention provides a tester for measuring insulation resistance of a power battery, including: the testing unit comprises a relay assembly, a voltmeter and a first reference resistor, wherein a first pin of the testing unit is connected with the anode of the power battery to be tested, a second pin of the testing unit is connected with the cathode of the power battery to be tested, and a third pin of the testing unit is grounded; the control unit is used for controlling the on/off of the relay assembly so as to respectively acquire a first voltage, a second voltage and a reference voltage; the logic unit is used for acquiring the insulation resistance of the power battery to be tested according to the first voltage, the second voltage, the first reference voltage and the first reference resistance; and the display unit is used for displaying the insulation resistance of the power battery to be tested.
According to the tester for measuring the insulation resistance of the power battery provided by the embodiment of the invention, the first pin of the tester is connected with the anode of the power battery to be tested, the second pin is connected with the cathode of the power battery to be tested, and the third pin is grounded, so that the insulation resistance of the power battery to be tested can be automatically tested according to the insulation detection standard of GB/T18384.1-2015, on the premise of ensuring high accuracy of a test result, the test operation flow is greatly simplified, the working efficiency is improved, and the automation of testing the insulation resistance of the power battery is realized.
According to an embodiment of the present invention, the relay assembly includes a first relay, a second relay, a third relay, a fourth relay, a fifth relay, a sixth relay and a seventh relay, wherein the first pin is connected to one end of the first relay, the second pin is connected to one end of the second relay, the other end of the first relay is connected to one end of the third relay and one end of the sixth relay, the other end of the second relay is connected to the other end of the third relay and one end of the fourth relay, one end of the first reference resistor is connected, the other end of the first reference resistor is connected to one end of the fifth relay, the other end of the fifth relay and the other end of the fourth relay are connected to one end of the voltmeter, and the other end of the voltmeter is connected to the other end of the sixth relay, One end of the seventh relay is connected, and the other end of the seventh relay is connected with the third pin; when the test is started, the control unit controls the first relay, the third relay, the fourth relay and the seventh relay to be closed, controls other relays to be opened, and obtains the first voltage through the voltmeter; the control unit controls the second relay, the fourth relay and the seventh relay to be closed and controls other relays to be opened, and the second voltage is obtained through the voltmeter; and the control unit controls the first relay, the third relay, the fifth relay and the seventh relay to be closed, other relays to be opened, and the reference voltage is obtained through the voltmeter.
According to an embodiment of the invention, the test unit further comprises an eighth relay and a second reference resistor, wherein the eighth relay and the second reference resistor are connected in series and then are connected in parallel with the fifth relay and the first reference resistor branch; the control unit controls the first relay, the second relay, the fourth relay and the sixth relay to be closed, other relays are opened, the total voltage of the power battery to be tested is obtained through the voltmeter, and the insulation resistance is determined by selecting one of the first reference resistance and the second reference resistance according to the total voltage.
According to one embodiment of the present invention, the logic unit compares the first voltage and the second voltage, and determines the larger value as U1The smaller value is determined as U1' the logic unit determines the insulation resistance according to the following formula:
wherein R is0Representing the first or second reference resistance, RiRepresents the insulation resistance, U2Representing the reference voltage.
According to one embodiment of the present invention, the logic unit comprises a storage module and a calculation module, wherein the storage module is configured to store the first voltage, the second voltage, the reference voltage, and the first reference resistance or the second reference resistance; the calculation module is configured to calculate the insulation resistance from the first voltage, the second voltage, the reference voltage, and the first reference resistance or the second reference resistance.
According to an embodiment of the present invention, the display unit is further configured to display the first voltage, the second voltage, the total voltage, the reference voltage, and the first reference resistance or the second reference resistance.
According to one embodiment of the invention, the tester for measuring the insulation resistance of the power battery further comprises a first overcurrent protection device and a second overcurrent protection device, wherein one end of the first overcurrent protection device is connected with the other end of the first relay, and the other end of the first overcurrent protection device is connected with one end of the sixth relay and one end of the third relay; one end of the second overcurrent protection device is connected with the other end of the second relay, and the other end of the second overcurrent protection device is connected with the other end of the third relay, one end of the fourth relay and one end of the fifth relay.
Drawings
FIG. 1 is a block schematic diagram of a tester for measuring insulation resistance of a power cell according to one embodiment of the present invention;
fig. 2 is a schematic diagram of a tester for measuring insulation resistance of a power cell according to an embodiment of the invention.
Reference numerals:
a test unit 101; a control unit 102; a logic unit 103; a display unit 104;
a first relay 1; a second relay 2; a third relay 3; a fourth relay 4;
a fifth relay 5; a sixth relay 6; a seventh relay 7; an eighth relay 8;
a first reference resistor 9; a second reference resistor 10; a first overcurrent protection device 11;
a second overcurrent protection device 12; a first pin 13; a second pin 14; a third pin 15;
a voltmeter 16; a tester 100.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The following describes in detail a tester for measuring insulation resistance of a power battery according to an embodiment of the present invention with reference to the accompanying drawings.
Fig. 1 is a block schematic diagram of a tester for measuring insulation resistance of a power cell according to an embodiment of the invention. As shown in fig. 1, the tester includes a test unit, a control unit, a logic unit, and a display unit.
The test unit comprises a relay component, a voltmeter and a first reference resistor; the control unit controls the relay assembly to be closed or opened, so that a first voltage, a second voltage and a reference voltage are obtained respectively; the logic unit is used for acquiring the insulation resistance of the power battery to be tested according to the first voltage, the second voltage, the first reference voltage and the first reference resistance; and the display unit is used for displaying the insulation resistance of the power battery to be tested.
When the tester tests the insulation resistance of the power battery to be tested, the first pin of the test unit is connected with the anode of the power battery to be tested, the second pin of the test unit is connected with the cathode of the power battery to be tested, and the third pin of the test unit is grounded. The control unit controls the on or off of the relay assembly, and the logic unit respectively stores and records the numerical values displayed by the voltmeter so as to calculate the insulation resistance of the power battery to be tested. And finally, displaying the numerical value of the insulation resistance through the display unit.
According to the tester for measuring the insulation resistance of the power battery, provided by the embodiment of the invention, the first pin is connected with the anode of the power battery to be tested, the second pin is connected with the cathode of the power battery to be tested, and the third pin is grounded, so that the insulation resistance of the power battery to be tested can be automatically tested according to the insulation detection standard GB/T18384.1-2015, on the premise of ensuring the high accuracy of the test result, the test operation flow is greatly simplified, the working efficiency is improved, and the automation of testing the insulation resistance of the power battery is realized.
Fig. 2 is a schematic diagram of a tester for measuring insulation resistance of a power battery according to an embodiment of the invention.
As shown in fig. 2, the tester 100 includes: a test unit 101, a control unit 102, a logic unit 103 and a display unit 104. The test unit 101 includes a first relay 1, a second relay 2, a third relay 3, a fourth relay 4, a fifth relay 5, a sixth relay 6, a seventh relay 7, an eighth relay 8, a first reference resistor 9, a second reference resistor 10, a voltmeter 16, a first overcurrent protection device 11, and a second overcurrent protection device 12.
Wherein the first pin 13 is connected with one end of the first relay 1, the second pin 14 is connected with one end of the second relay 2, the other end of the first relay 1 is connected with one end of the first overcurrent protection device 11, the other end of the second relay 2 is connected with one end of the second overcurrent protection device 12, the other end of the first overcurrent protection device 11 is connected with one end of the third relay 3 and one end of the sixth relay 6, the other end of the second overcurrent protection device 12 is connected with the other end of the third relay 3 and one end of the fourth relay 4, one end of the first reference resistor 9 and one end of the second reference resistor 10, the other end of the first reference resistor 9 is connected with one end of the fifth relay 5, and the other end of the second reference resistor 10 is connected with one end of the eighth relay 8, the other end of the fifth relay 5, the other end of the eighth relay 8, and the other end of the fourth relay 4 are connected to one end of a voltmeter 16, the other end of the voltmeter 16 is connected to the other end of the sixth relay 6 and one end of the seventh relay 7, and the other end of the seventh relay 7 is connected to the third pin 15.
And all relays are disconnected before the insulation resistance of the power battery to be tested is tested.
When the test of the insulation resistance is started, the control unit controls the first relay 1, the third relay 3, the fourth relay 4 and the seventh relay 7 to be closed, and simultaneously controls other relays to be opened, at this time, the voltmeter 16 displays a first voltage, and the first voltage is stored by the logic unit.
Then, the control unit controls the first relay 1 and the third relay 3 to be opened, keeps the fourth relay 4 and the seventh relay 7 closed, and controls the second relay 2 to be closed, at this time, the voltmeter 16 displays a second voltage, and the second voltage is stored by the logic unit.
Then, the control unit controls the seventh relay 7 to be opened, keeps the second relay 2 and the fourth relay 4 closed, and controls the first relay 1 and the sixth relay 6 to be closed, at this time, the voltmeter 16 displays the total voltage of the power battery to be tested, and the total voltage is stored by the logic unit.
In view of the fact that the tester is designed according to the insulation detection standard of GB/T18384.1-2015, which specifies that the operating voltage range is 100 Ω/V-500 Ω/V, the control unit calculates the operating voltages of the first reference resistor and the second reference resistor respectively according to the total voltage, selects a resistor meeting the specification from the first reference resistor and the second reference resistor according to the standard, and calculates the insulation resistance of the power battery to be tested by the logic unit.
For example, assuming that the resistance value of the first reference resistor is 20k Ω, the resistance value of the second reference resistor is 100k Ω, and the total voltage is 500V, it can be known that the operating voltage (200 Ω/V) of the second reference resistor meets the specification of the above standard, that is, the control unit selects the resistance value of the second reference resistor 10 as the reference resistance value for calculating the insulation resistor of the power battery to be tested. At this time, the control unit controls the second relay 2, the fourth relay 4, and the sixth relay 6 to be opened, keeping the first relay 1 closed, and controls the third relay 3, the seventh relay 7, and the eighth relay 8 to be closed, at which time the voltmeter 16 displays a reference voltage, which is stored by the logic unit.
The logic unit compares the first voltage and the second voltage, and determines the larger value as U1The smaller value is determined as U1' the logic unit determines the insulation resistance according to the following formula:
wherein R is0Represents the second reference resistance, RiRepresents the insulation resistance, U2Presentation instrumentThe reference voltage.
The display unit may display the finally measured insulation resistance of the power battery to be measured, and may also display an intermediate value required for measuring the insulation resistance, such as the first voltage, the second voltage, the total voltage, the reference voltage, the first reference resistance, or the second reference resistance. The display unit can display multiple groups of data of the measured insulation resistance for multiple times on the same screen, so that the multiple groups of data can be compared and analyzed conveniently.
Further, according to an embodiment of the present invention, the logic unit may include a storage module and a calculation module. Wherein the storage module is configured to store the first voltage, the second voltage, the reference voltage, and the first reference resistance or the second reference resistance; the calculation module is configured to calculate the insulation resistance from the first voltage, the second voltage, the reference voltage, and the first reference resistance or the second reference resistance.
The tester for measuring the insulation resistance of the power battery provided by the embodiment of the invention greatly simplifies the testing operation process and improves the working efficiency on the premise of ensuring the high accuracy of the testing result, thereby realizing the automation of the testing of the insulation resistance of the power battery.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (6)
1. A tester for measuring insulation resistance of a power battery is characterized by comprising:
the testing unit comprises a relay assembly, a voltmeter and a first reference resistor, wherein a first pin of the testing unit is connected with the anode of the power battery to be tested, a second pin of the testing unit is connected with the cathode of the power battery to be tested, and a third pin of the testing unit is grounded;
the relay assembly comprises a first relay, a second relay, a third relay, a fourth relay, a fifth relay, a sixth relay and a seventh relay, wherein the first pin is connected with one end of the first relay, the second pin is connected with one end of the second relay, the other end of the first relay is connected with one end of the third relay and one end of the sixth relay, the other end of the second relay is connected with the other end of the third relay, one end of the fourth relay and one end of the first reference resistor, the other end of the first reference resistor is connected with one end of the fifth relay, the other end of the fifth relay and the other end of the fourth relay are connected with one end of the voltmeter, and the other end of the voltmeter is connected with the other end of the sixth relay, One end of the seventh relay is connected, and the other end of the seventh relay is connected with the third pin;
a control unit for controlling the closing or opening of the relay assembly to obtain a first voltage, a second voltage and a reference voltage, respectively, comprising: when the test is started, the control unit controls the first relay, the third relay, the fourth relay and the seventh relay to be closed, controls other relays to be opened, and obtains the first voltage through the voltmeter; the control unit controls the second relay, the fourth relay and the seventh relay to be closed and controls other relays to be opened, and the second voltage is obtained through the voltmeter; the control unit controls the first relay, the third relay, the fifth relay and the seventh relay to be closed, other relays to be opened, and the reference voltage is obtained through the voltmeter;
the logic unit is used for acquiring the insulation resistance of the power battery to be tested according to the first voltage, the second voltage, the reference voltage and the first reference resistance; and
and the display unit is used for displaying the insulation resistance of the power battery to be tested.
2. The tester for measuring the insulation resistance of the power battery according to claim 1, wherein the test unit further comprises an eighth relay and a second reference resistor;
the eighth relay is connected with the second reference resistor in series and then is connected with the fifth relay and the first reference resistor branch in parallel;
the control unit controls the first relay, the second relay, the fourth relay and the sixth relay to be closed, other relays are disconnected, the total voltage of the power battery to be tested is obtained through the voltmeter, a first working voltage corresponding to the first reference resistor and a second working voltage corresponding to the second reference resistor are calculated according to the total voltage, whether the first working voltage and the second working voltage are within a standard working voltage range or not is judged respectively, and a reference resistance value corresponding to a voltage value within the standard working voltage range is selected to determine the insulation resistor.
3. The tester for measuring the insulation resistance of the power battery according to claim 2,
the logic unit compares the first voltage and the second voltage, and determines the larger value as U1The smaller value is determined as U1' ；
The logic unit determines the insulation resistance according to the following formula:
wherein R is0Representing the first or second reference resistance, RiRepresents the insulation resistance, U2Representing the reference voltage.
4. The tester for measuring the insulation resistance of a power battery according to claim 2, wherein the logic unit comprises a storage module and a calculation module, wherein,
the storage module is used for storing the first voltage, the second voltage, the reference voltage and the first reference resistance or the second reference resistance;
the calculation module is configured to calculate the insulation resistance from the first voltage, the second voltage, the reference voltage, and the first reference resistance or the second reference resistance.
5. The tester for measuring insulation resistance of a power battery according to claim 2, wherein the display unit is further configured to display the first voltage, the second voltage, the total voltage, the reference voltage, and the first reference resistance or the second reference resistance.
6. The tester for measuring the insulation resistance of the power battery according to any one of claims 2 to 5, further comprising a first overcurrent protection device and a second overcurrent protection device, wherein,
one end of the first overcurrent protection device is connected with the other end of the first relay, and the other end of the first overcurrent protection device is connected with one end of the sixth relay and one end of the third relay;
one end of the second overcurrent protection device is connected with the other end of the second relay, and the other end of the second overcurrent protection device is connected with the other end of the third relay, one end of the fourth relay, one end of the first reference resistor and one end of the second reference resistor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610227816.7A CN105911352B (en) | 2016-04-13 | 2016-04-13 | Tester for measuring insulation resistance of power battery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610227816.7A CN105911352B (en) | 2016-04-13 | 2016-04-13 | Tester for measuring insulation resistance of power battery |
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| CN105911352B true CN105911352B (en) | 2020-02-18 |
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| CN108226721A (en) * | 2017-12-19 | 2018-06-29 | 上海汽车集团股份有限公司 | Electric automobile high-voltage safety test multi-measuring point automatic test approach |
| CN111965428B (en) * | 2020-08-05 | 2023-03-24 | 东软睿驰汽车技术（沈阳）有限公司 | Insulation resistance detection method, device, equipment and storage medium |
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| JP3480019B2 (en) * | 1993-12-29 | 2003-12-15 | 松下電工株式会社 | Leakage determination method and device |
| JP2006220520A (en) * | 2005-02-10 | 2006-08-24 | Honda Motor Co Ltd | Dielectric resistance measuring device of floating d.c. power supply and its method |
| US8421467B2 (en) * | 2009-11-19 | 2013-04-16 | Valence Technology, Inc. | Battery insulation resistance measurement methods, insulation resistance measurement methods, insulation resistance determination apparatuses, and articles of manufacture |
| KR101908637B1 (en) * | 2012-01-05 | 2018-10-17 | 에스케이이노베이션 주식회사 | Circuit for measuring insulatioin resistance |
| CN104142475B (en) * | 2013-05-06 | 2017-08-22 | 广州汽车集团股份有限公司 | A kind of insulation monitoring module evaluating apparatus and method |
| CN203705549U (en) * | 2013-12-02 | 2014-07-09 | 北汽福田汽车股份有限公司 | Insulation resistor detection system of power system |
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