CN113466729A - Insulation resistance detection method and system for lithium ion power storage battery - Google Patents
Insulation resistance detection method and system for lithium ion power storage battery Download PDFInfo
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 140
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 140
- 238000003860 storage Methods 0.000 title claims abstract description 122
- 238000001514 detection method Methods 0.000 title claims abstract description 118
- 238000009413 insulation Methods 0.000 title claims abstract description 118
- 238000000034 method Methods 0.000 claims abstract description 28
- 238000012360 testing method Methods 0.000 claims description 18
- 238000005259 measurement Methods 0.000 claims description 15
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- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 3
- 238000007726 management method Methods 0.000 description 19
- 238000007599 discharging Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000011895 specific detection Methods 0.000 description 6
- 238000004146 energy storage Methods 0.000 description 4
- 230000002457 bidirectional effect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
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- 230000004048 modification Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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Abstract
The application discloses insulation resistance detection method and system for a lithium ion power storage battery, wherein the method comprises the following steps: receiving setting information of detection environment parameters to determine the insulation resistance detection environment of the lithium ion power storage battery; detecting the insulation resistance value of the lithium ion power storage battery in the insulation resistance detection environment; determining whether the insulation resistance value of the lithium ion power storage battery is within a preset range; and under the condition that the insulation resistance value of the lithium ion power storage battery is determined to be in a preset range, determining that the insulation resistance value of the lithium ion power storage battery meets a detection standard. By the adoption of the method and the device, the insulation resistance value of the lithium ion power storage battery can be detected, and then the quality of the lithium ion power storage battery is identified and evaluated, so that the accuracy of judging the quality and the safety condition of the lithium ion power storage battery is improved, and the safety and the usability of the new energy automobile are improved.
Description
Technical Field
The application relates to the technical field of new energy, in particular to a method and a system for detecting insulation resistance of a lithium ion power storage battery.
Background
According to statistics, from 2012 to 2017, the annual production and sales of new energy automobiles are increased from 1 ten thousand to more than 60 ten thousand, the retention amount exceeds the critical point of 1%, the first world is formed by exceeding Japan and America, the industry finishes the lead-in period, and the industry steadily enters the growth period. And various development planning related documents are continuously provided in China, so that new energy automobiles gradually become the future key development field of the automobile industry in China.
And the lithium ion power storage battery products are finally applied to the fields of new energy automobile power and energy storage. However, the development of lithium ion power storage batteries in the field of new energy automobiles faces safety challenges: on one hand, the lithium ion power storage battery is short-circuited and burnt and exploded due to improper use method of a user; on the other hand, lithium ions of the lithium ion power storage battery are active in chemical property, and are easy to explode and combust once high temperature occurs under the coordination of a graphite cathode. The combustion and explosion of the lithium ion power storage battery in use can bring personal and property threats to users of new energy automobiles.
Therefore, the method and the device can detect the parameters/indexes such as the insulation resistance of the lithium ion power storage battery of the new energy automobile, can identify and evaluate the quality of the lithium ion power storage battery, and are beneficial to improving the accuracy of judging the quality and the safety condition of the lithium ion power storage battery.
Disclosure of Invention
The present application is proposed to solve the above-mentioned technical problems. The embodiment of the application provides a method and a system for detecting the insulation resistance of a lithium ion power storage battery.
According to one aspect of the application, an insulation resistance detection method for a lithium ion power storage battery is provided, wherein the lithium ion power storage battery comprises more than one single battery cell, and the method comprises the following steps:
receiving setting information of detection environment parameters to determine the insulation resistance detection environment of the lithium ion power storage battery;
detecting the insulation resistance value of the lithium ion power storage battery in the insulation resistance detection environment;
determining whether the insulation resistance value of the lithium ion power storage battery is within a preset range;
and under the condition that the insulation resistance value of the lithium ion power storage battery is determined to be in a preset range, determining that the insulation resistance value of the lithium ion power storage battery meets a detection standard.
In some embodiments, the receiving detects setting information of an environmental parameter to determine the lithium ion
The insulation resistance detection environment of sub-power storage battery includes:
setting detection precision parameters of a preset battery management system and detection equipment to adjust
And presetting the detection precision of the battery management system and the detection equipment.
In some embodiments, the detection accuracy parameters of the battery management system and the detection device are preset,
the method comprises the following steps:
the detection precision parameters of the preset battery management system comprise a first precision parameter, and the first precision parameter
The degree parameters include: the SOC estimation precision is not more than 10%, the current error is not more than +/-3%, and the total voltage error is not more than +/-2%;
the detection precision parameter of the detection device comprises a second precision parameter, and the second precision parameter comprises: the measurement error of the output current is not more than +/-0.1% FS, the measurement error of the output voltage is not more than +/-0.1% FS, the measurement error of the temperature is not more than +/-0.5 ℃, the measurement error of the time is not more than +/-0.1 s, and the insulation test precision is required to be +/-5%.
In some embodiments, said detecting said lithium ion movement is in said insulation resistance detection environment
An insulation resistance value of a force accumulator comprising:
disconnecting the low voltage power supply of the carrier vehicle of the lithium ion power storage battery; and the number of the first and second groups,
disassembling a high-voltage loop maintenance switch of the lithium ion power storage battery;
applying 1000Vd.c. to the lithium ion power storage battery through an insulation test meter and maintaining the second voltage
A preset time;
and when the time reaches a first preset time, detecting a high-voltage loop maintenance switch of the lithium ion power storage battery and the insulation resistance value of the output end of the lithium ion power storage battery and the carrier vehicle shell through the insulation test instrument.
In some embodiments, the first predetermined time is 30 seconds, 1 minute, 1.5 minutes, or 2 minutes.
In some embodiments, said detecting said lithium ion movement is in said insulation resistance detection environment
An insulation resistance value of a force accumulator comprising:
establishing a communication connection between a detection device and a carrier vehicle of the lithium-ion power storage battery; and the number of the first and second groups,
monitoring the insulation resistance of a battery management system of a carrier vehicle for suspending said lithium-ion power accumulator
Measuring the function;
and detecting the insulation resistance of the lithium ion power storage battery through the detection equipment to obtain the insulation resistance value of the lithium ion power storage battery.
In some embodiments, the method further comprises:
after the insulation resistance value of the lithium ion power storage battery is detected by the detection equipment,
restarting an insulation resistance monitoring function of a battery management system of a carrier vehicle of the lithium ion power storage battery.
In some embodiments, the determining whether the insulation resistance value of the lithium ion power battery is at
Within the preset range, the method comprises the following steps:
detecting the insulation resistance value of the lithium ion power storage battery and the end of the preset range
Comparing the values;
determining the insulation resistance value is greater than the end value of the preset range when determining that the insulation resistance value is greater than the end value of the preset range
The insulation resistance value of the lithium ion power storage battery is within a preset range.
In some embodiments, the predetermined range is at the end of 500 Ω/V.
According to another aspect of the present application, an insulation resistance detection system for a lithium ion power storage battery, the lithium ion power storage battery including one or more unit cells, the system comprising: presetting a battery management system, detection equipment and an insulation test instrument;
the preset battery management system and the detection equipment receive the setting information of the detection environment parameters to determine the insulation resistance detection environment of the lithium ion power storage battery;
the detection equipment and/or the insulation test instrument detects the insulation resistance value of the lithium ion power storage battery in the insulation resistance detection environment;
the detection device determines whether the insulation resistance value of the lithium ion power storage battery is within a preset range;
and the detection equipment determines that the insulation resistance value of the lithium ion power storage battery meets the detection standard under the condition that the insulation resistance value of the lithium ion power storage battery is determined to be within a preset range.
The embodiment that the application provided provides a detection method and system to new energy automobile lithium ion power battery's insulation resistance, adopts this application can detect lithium ion power battery's insulation resistance, and then appraises the aassessment to lithium ion power battery's quality, is favorable to promoting the accuracy of judging lithium ion power battery's quality and security situation, promotes new energy automobile's security and usability.
Drawings
The above and other objects, features and advantages of the present application will become more apparent by describing in more detail embodiments of the present application with reference to the attached drawings. The accompanying drawings are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings, like reference numbers generally represent like parts or steps.
Fig. 1 is a schematic diagram of detection connection of a lithium-ion power storage battery provided in an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a detection system of a lithium-ion power storage battery according to an embodiment of the present application.
Fig. 3 is a schematic flow chart of a method for detecting insulation resistance of a lithium ion power storage battery according to an embodiment of the present application.
Detailed Description
Hereinafter, example embodiments according to the present application will be described in detail with reference to the accompanying drawings. It should be understood that the described embodiments are only some embodiments of the present application and not all embodiments of the present application, and that the present application is not limited by the example embodiments described herein.
Fig. 1 is a schematic diagram of detection connection of a lithium-ion power storage battery provided in an embodiment of the present application.
As shown in fig. 1, a is a lithium ion power storage BATTERY, which includes a plurality of or at least one cell, B is a BATTERY management system (BATTERY MANAGEMENT SYSTEM, BMS), and C is a detection device. The BMS can also be called a battery caregiver or a battery manager, and is mainly used for intelligently managing and maintaining each battery unit, preventing the battery from being overcharged and overdischarged, prolonging the service life of the battery and monitoring the state of the battery, in addition, after the BMS opens the function of discharging the electric vehicle by using a direct current charging port, after a detection process is started, information of charging/discharging state guidance, maximum allowable discharging current, minimum cell voltage, cell minimum allowable voltage and the like which are continuously output contents are added in a charging network, through the information, the detection equipment can safely charge/discharge the vehicle, and the information interaction quantity of the BMS and a detection module in a direct current charging network is increased, after the detection process is confirmed, the BMS sends statistical information including the use of the lithium ion power storage battery, the use information of the lithium ion power storage battery, the charge power supply and the detection module in the direct current charging network, And all the monomer voltage information and the like are utilized by the detection equipment to calculate and output the state parameters of the lithium ion power storage battery by utilizing the information and the information which is interacted with the direct current charging.
In the embodiment of the application, in order to improve the convenience and the precision of the lithium ion power storage battery,
the detection device can meet the following requirements: the lithium ion power storage battery charging system is provided with a bidirectional isolation DC-DC module, and an energy storage system with 90kWh electric quantity is configured at a direct current end so as to safely fully charge and discharge the lithium ion power storage battery; secondly, the flow and parameter control of the detection equipment are controlled in a programmable mode, full charge and fixed SOC discharge are carried out on the vehicle lithium ion power storage battery according to the BMS control current and voltage requirements, meanwhile, in the charging and discharging processes, a fixed SOC value is obtained, pulse current with a fixed time length is output, and preparation for obtaining direct current internal resistance information is carried out; and thirdly, the detection equipment has the detection precision of the current and the voltage (plus or minus 0.1% rdg. + orminus 0.1% f.s.) of the direct-current end of the lithium ion power storage battery, and the data such as output capacity, internal resistance, voltage difference and the like are calculated through the acquired data.
In general, the detection device in the embodiment of the present application may have the following conditions: the device at least has a direct current charging function and a direct current discharging function; the detection precision meets the following requirements: the measurement error of the output current is not more than +/-0.1% FS; the measurement error of the output voltage does not exceed +/-0.1% FS; the temperature measurement error is not more than +/-0.5 ℃; the time measurement error is not more than +/-0.1 s; the precision requirement of insulation resistance test equipment is as follows: 5 percent.
The lithium-ion power accumulator is usually mounted in its carrier vehicle, which is not shown in this figure, mainly to show the connection situation and the devices or equipment involved in the test.
On the basis of the connection, the following describes the detection system of the lithium-ion power storage battery provided by the present application in detail.
Fig. 2 is a schematic diagram of a detection system of a lithium-ion power storage battery according to an embodiment of the present application.
As shown in fig. 2, the detection system for a lithium-ion power storage battery provided in the embodiment of the present application, the lithium-ion power storage battery includes more than one unit cell, the system is configured to detect a state parameter of the lithium-ion power storage battery, and may include a specific detection device 21 and a battery management system BMS 22, and the specific detection device 21 is communicatively connected to the battery management system BMS 22.
The specific detection device 21 comprises a first detection module 211, a communication module 212, a bidirectional isolation DC-DC module 213 and an energy storage module 214, wherein the bidirectional isolation DC-DC module 213 and the energy storage module 214 are used for charging the lithium ion power storage battery, and the first detection module 211 is used for determining a detection state parameter of the lithium ion power storage battery.
The battery management system BMS 22 includes a discharging module 221, an instruction module 222, a data transmission module 223, and a second detection module 224, wherein the discharging module 221 is configured to discharge the lithium ion power storage battery through a dc charging port, the instruction module 222 is configured to send instruction information to the specific detection device, the second detection module 224 is configured to detect an initial state parameter of the lithium ion power storage battery, and the data transmission module 223 is configured to send the detected initial state parameter to the specific detection module.
Based on the detection system and the structure of the detection system, the application provides a method for detecting the insulation resistance of the lithium-ion power storage battery. Fig. 3 is a schematic flow chart of a method for detecting insulation resistance of a lithium ion power storage battery according to an embodiment of the present application.
As shown in fig. 3, a method for detecting insulation resistance of a lithium ion power storage battery, where the lithium ion power storage battery includes more than one single battery cell, may include the following steps:
Illustratively, the detection precision parameters of the preset battery management system and the detection device are set,
so as to adjust the detection precision of the preset battery management system and the detection equipment. The detection precision parameters of the preset battery management system comprise a first precision parameter, and the first precision parameter comprises: the SOC estimation precision is not more than 10%, the current error is not more than +/-3%, and the total voltage error is not more than +/-2%; the detection precision parameter of the detection device comprises a second precision parameter, and the second precision parameter comprises: the measurement error of the output current is not more than +/-0.1% FS, the measurement error of the output voltage is not more than +/-0.1% FS, the measurement error of the temperature is not more than +/-0.5 ℃, the measurement error of the time is not more than +/-0.1 s, and the insulation test precision is required to be +/-5%.
And 302, detecting the insulation resistance value of the lithium ion power storage battery in the insulation resistance detection environment.
Disconnecting low-voltage power supply of a carrier vehicle of the lithium-ion power storage battery in the insulation resistance detection environment; and, disassembling a high voltage circuit maintenance switch of the lithium ion power storage battery; applying 1000Vd.c. to the lithium ion power storage battery through an insulation test instrument and maintaining for a first preset time; and when the time reaches a first preset time, detecting a high-voltage loop maintenance switch of the lithium ion power storage battery and the insulation resistance value of the output end of the lithium ion power storage battery and the carrier vehicle shell through the insulation test instrument. Wherein the first preset time is 30 seconds, 1 minute, 1.5 minutes or 2 minutes.
In other embodiments, the lithium ion dynamic storage is detected by the detection device
And after the insulation resistance value of the battery, restarting the insulation resistance monitoring function of a battery management system of the carrier vehicle of the lithium-ion power storage battery.
Detecting the insulation resistance value of the lithium ion power storage battery and the end of the preset range
Comparing the values; and under the condition that the insulation resistance value is larger than the end value of the preset range, determining that the insulation resistance value of the lithium ion power storage battery is in the preset range. Wherein, the end value of the preset range is 500 omega/V.
And 304, determining that the insulation resistance value of the lithium ion power storage battery meets the detection standard under the condition that the insulation resistance value of the lithium ion power storage battery is determined to be in a preset range.
The embodiment that the application provided provides a detection method to new energy automobile lithium ion power battery's insulation resistance, adopts this application can detect lithium ion power battery's insulation resistance, and then appraises the aassessment to lithium ion power battery's quality, is favorable to promoting the accuracy of judging lithium ion power battery's quality and security situation, promotes new energy automobile's security and usability.
The application also provides an insulation resistance detection system of the lithium ion power storage battery, wherein the lithium ion power storage battery comprises more than one single battery cell, and the system comprises a preset battery management system, detection equipment (namely the specific detection equipment) and an insulation test instrument; illustratively, an insulation test instrument can be externally connected to the lithium ion power storage battery on the basis of the system shown in fig. 2.
The preset battery management system and the detection equipment receive the setting information of the detection environment parameters to determine the insulation resistance detection environment of the lithium ion power storage battery;
the detection equipment and/or the insulation test instrument detects the insulation resistance value of the lithium ion power storage battery in the insulation resistance detection environment;
the detection device determines whether the insulation resistance value of the lithium ion power storage battery is within a preset range;
and the detection equipment determines that the insulation resistance value of the lithium ion power storage battery meets the detection standard under the condition that the insulation resistance value of the lithium ion power storage battery is determined to be within a preset range.
The foregoing describes the general principles of the present application in conjunction with specific embodiments, however, it is noted that the advantages, effects, etc. mentioned in the present application are merely examples and are not limiting, and they should not be considered essential to the various embodiments of the present application. Furthermore, the foregoing disclosure of specific details is for the purpose of illustration and description and is not intended to be limiting, since the foregoing disclosure is not intended to be exhaustive or to limit the disclosure to the precise details disclosed.
The block diagrams of devices, apparatuses, systems referred to in this application are only given as illustrative examples and are not intended to require or imply that the connections, arrangements, configurations, etc. must be made in the manner shown in the block diagrams. These devices, apparatuses, devices, systems may be connected, arranged, configured in any manner, as will be appreciated by those skilled in the art. Words such as "including," "comprising," "having," and the like are open-ended words that mean "including, but not limited to," and are used interchangeably therewith. The words "or" and "as used herein mean, and are used interchangeably with, the word" and/or, "unless the context clearly dictates otherwise. The word "such as" is used herein to mean, and is used interchangeably with, the phrase "such as but not limited to".
It should also be noted that in the devices, apparatuses, and methods of the present application, the components or steps may be decomposed and/or recombined. These decompositions and/or recombinations are to be considered as equivalents of the present application.
The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the application. Thus, the present application is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing description has been presented for purposes of illustration and description. Furthermore, the description is not intended to limit embodiments of the application to the form disclosed herein. While a number of example aspects and embodiments have been discussed above, those of skill in the art will recognize certain variations, modifications, alterations, additions and sub-combinations thereof.
Claims (10)
1. A method for detecting the insulation resistance of a lithium ion power storage battery, wherein the lithium ion power storage battery comprises more than one single battery cell, and the method comprises the following steps:
receiving setting information of detection environment parameters to determine the insulation resistance detection environment of the lithium ion power storage battery;
detecting the insulation resistance value of the lithium ion power storage battery in the insulation resistance detection environment;
determining whether the insulation resistance value of the lithium ion power storage battery is within a preset range;
and under the condition that the insulation resistance value of the lithium ion power storage battery is determined to be in a preset range, determining that the insulation resistance value of the lithium ion power storage battery meets a detection standard.
2. The method of claim 1, wherein receiving the setting information of the detection environment parameters to determine the insulation resistance detection environment of the lithium ion power storage battery comprises:
setting detection precision parameters of a preset battery management system and detection equipment to adjust
And presetting the detection precision of the battery management system and the detection equipment.
3. The method of claim 2, wherein presetting the detection accuracy parameters of the battery management system and the detection device comprises:
the detection precision parameters of the preset battery management system comprise a first precision parameter, and the first precision parameter
The degree parameters include: the SOC estimation precision is not more than 10%, the current error is not more than +/-3%, and the total voltage error is not more than +/-2%;
the detection precision parameter of the detection device comprises a second precision parameter, and the second precision parameter comprises: the measurement error of the output current is not more than +/-0.1% FS, the measurement error of the output voltage is not more than +/-0.1% FS, the measurement error of the temperature is not more than +/-0.5 ℃, the measurement error of the time is not more than +/-0.1 s, and the insulation test precision is required to be +/-5%.
4. The method of claim 1, wherein said detecting an insulation resistance value of said lithium ion power battery in said insulation resistance detection environment comprises:
disconnecting the low voltage power supply of the carrier vehicle of the lithium ion power storage battery; and the number of the first and second groups,
disassembling a high-voltage loop maintenance switch of the lithium ion power storage battery;
applying 1000Vd.c. to the lithium ion power storage battery through an insulation test meter and maintaining the second voltage
A preset time;
and when the time reaches a first preset time, detecting a high-voltage loop maintenance switch of the lithium ion power storage battery and the insulation resistance value of the output end of the lithium ion power storage battery and the carrier vehicle shell through the insulation test instrument.
5. The method according to claim 4, wherein the first preset time is 30 seconds, 1 minute, 1.5 minutes or 2 minutes.
6. The method of claim 1, wherein said detecting an insulation resistance value of said lithium ion power battery in said insulation resistance detection environment comprises:
establishing a communication connection between a detection device and a carrier vehicle of the lithium-ion power storage battery; and the number of the first and second groups,
monitoring the insulation resistance of a battery management system of a carrier vehicle for suspending said lithium-ion power accumulator
Measuring the function;
and detecting the insulation resistance of the lithium ion power storage battery through the detection equipment to obtain the insulation resistance value of the lithium ion power storage battery.
7. The method of claim 6, further comprising:
after the insulation resistance value of the lithium ion power storage battery is detected by the detection equipment,
restarting an insulation resistance monitoring function of a battery management system of a carrier vehicle of the lithium ion power storage battery.
8. The method of claim 1, wherein the determining whether the insulation resistance value of the lithium ion power battery is within a preset range comprises:
detecting the insulation resistance value of the lithium ion power storage battery and the end of the preset range
Comparing the values;
determining the insulation resistance value is greater than the end value of the preset range when determining that the insulation resistance value is greater than the end value of the preset range
The insulation resistance value of the lithium ion power storage battery is within a preset range.
9. Method according to claim 1 or 8, characterized in that the end of said preset range
The value was 500. omega./V.
10. The insulation resistance detection system of the lithium ion power storage battery comprises more than one single battery cell and is characterized by comprising a preset battery management system, detection equipment and an insulation test instrument;
the preset battery management system and the detection equipment receive the setting information of the detection environment parameters to determine the insulation resistance detection environment of the lithium ion power storage battery;
the detection equipment and/or the insulation test instrument detects the insulation resistance value of the lithium ion power storage battery in the insulation resistance detection environment;
the detection device determines whether the insulation resistance value of the lithium ion power storage battery is within a preset range;
and the detection equipment determines that the insulation resistance value of the lithium ion power storage battery meets the detection standard under the condition that the insulation resistance value of the lithium ion power storage battery is determined to be within a preset range.
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