CN111781520A - Power battery or super capacitor internal resistance test system and test method - Google Patents
Power battery or super capacitor internal resistance test system and test method Download PDFInfo
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- CN111781520A CN111781520A CN202010599516.8A CN202010599516A CN111781520A CN 111781520 A CN111781520 A CN 111781520A CN 202010599516 A CN202010599516 A CN 202010599516A CN 111781520 A CN111781520 A CN 111781520A
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- power battery
- super capacitor
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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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- 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
- G01R27/08—Measuring resistance by measuring both voltage and current
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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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
Abstract
The invention discloses a power battery or super capacitor internal resistance test system and a test method, wherein the system comprises a voltage variation sampling unit, a current sampling unit and a main control unit, wherein the main control unit respectively controls the voltage variation sampling unit and the current sampling unit, and is respectively communicated with an upper computer and power battery or super capacitor test equipment; the voltage variation sampling unit comprises a voltage variation capturing module, a first filtering and amplifying module, a peak holding module and a first analog-to-digital conversion module which are sequentially connected, and the first analog-to-digital conversion module is communicated with the main control unit; the current sampling unit comprises an I-V conversion module, a second filtering amplification module and a second analog-to-digital conversion module which are sequentially connected, and the second analog-to-digital conversion module is communicated with the main control unit. The system and the method disclosed by the invention have the advantages of high test resolution, good consistency, low cost and good accuracy.
Description
Technical Field
The invention relates to the technical field of power battery and super capacitor testing, in particular to a power battery or super capacitor internal resistance testing system and a testing method.
Background
The power battery or the super capacitor is a core component of the electric automobile, and the power battery and super capacitor industry is the foundation of the electric automobile industry. The power battery pack or the super capacitor assembly is formed by connecting batteries or capacitor monomers in series and in parallel, the characteristics of the batteries or the capacitor monomers such as internal resistance and the like are required to be consistent as much as possible, otherwise, the performance and the service life of the whole battery pack or the capacitor assembly are reduced due to the short plate effect of the wooden barrel, and therefore, the power batteries or the super capacitor monomers need to be sorted by adopting related detection equipment.
The conventional power battery or super capacitor testing instrument cannot achieve the purpose of effective sorting due to the problem of low resolution of a testing result, or the sorting accuracy is low and the effect is poor, so that the performance and the service life of a formed battery pack or capacitor assembly are not ideal, and the development of the power battery and super capacitor industry is severely restricted. Therefore, a high-resolution internal resistance test system is urgently needed to be provided, and a power battery and a super capacitor test device based on the high-resolution internal resistance test system are needed to effectively solve the problems.
Disclosure of Invention
In order to solve the technical problems, the invention provides a power battery or super capacitor internal resistance testing system and a testing method, so as to achieve the purposes of high testing resolution, good consistency, low cost and good accuracy.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a power battery or super capacitor internal resistance test system comprises a voltage variation sampling unit, a current sampling unit and a main control unit, wherein the main control unit respectively controls the voltage variation sampling unit and the current sampling unit, and is respectively communicated with an upper computer and power battery or super capacitor test equipment;
the voltage variation sampling unit comprises a voltage variation capturing module, a first filtering and amplifying module, a peak holding module and a first analog-to-digital conversion module which are sequentially connected, and the first analog-to-digital conversion module is communicated with the main control unit;
the current sampling unit comprises an I-V conversion module, a second filtering amplification module and a second analog-to-digital conversion module which are sequentially connected, and the second analog-to-digital conversion module is communicated with the main control unit.
In the scheme, the main control unit comprises a data processing and computing module, a control module and a communication module, and the communication module is communicated with the upper computer and the power battery or super capacitor testing equipment through the level conversion and isolation unit.
In the above scheme, the voltage variation sampling unit and the current sampling unit communicate with the main control unit in a serial or parallel or shared memory manner.
A power battery or super capacitor internal resistance test method adopts the power battery or super capacitor internal resistance test system, and comprises the following processes:
(1) setting a power battery or super capacitor test process or parameter through an upper computer;
(2) the upper computer transmits the testing process or parameters of the power battery or the super capacitor to the main control unit in an Ethernet communication mode, and the main control unit analyzes data according to a communication protocol after receiving the information and controls the voltage variation sampling unit and the current sampling unit to acquire the data;
(3) based on the data of the voltage variation sampling unit and the current sampling unit, the main control unit processes the data, calculates a result and returns the result to an upper computer or transmits the result to power battery or super capacitor testing equipment.
In the above scheme, the working process of the voltage variation sampling unit is as follows:
(1) the voltage variation capturing module shields the direct current or low-frequency part of the voltage of the power battery or the super capacitor, and takes out the small variation delta u;
(2) the filtering and amplifying module filters noise and interference in the signals according to the extracted small variable quantity delta u and amplifies the signals;
(3) the peak value holding module converts the peak value of the small variation delta u in the voltage u of the power battery or the super capacitor into direct current voltage;
(4) the analog-to-digital conversion module converts the analog quantity into digital quantity and transmits the digital quantity to the main control unit for data processing.
In the above scheme, the working process of the current sampling unit is as follows:
(1) the I-V conversion module converts a test heavy current signal of a power battery or a super capacitor into a voltage signal which is easy to sample and process;
(2) the second filtering and amplifying module filters noise and interference in the signals and amplifies the signals;
(3) the analog-to-digital conversion module II converts the analog quantity into digital quantity and transmits the digital quantity to the main control unit for data processing.
Through the technical scheme, the power battery or super capacitor internal resistance testing system and the testing method provided by the invention have the following beneficial effects:
(1) the method directly captures the tiny variation delta u in the voltage u of the power battery or the super capacitor for sampling and processing, and has the characteristics of high resolution and high consistency due to the fact that the independent capturing and sampling method of the tiny variation delta u has the characteristics of high resolution and small consistency, and the precision of the current variation delta i has small influence on the test result, so that the method compares the voltage u of the power battery or the super capacitor directly sampled and carries out analog-to-digital conversion under the condition that the number of bits of an analog-to-digital converter chip is fixed, and then calculates the variation delta u according to the difference of the digital values of u, and the calculated internal resistance r also has the characteristics of high resolution and high consistency.
(2) The peak value of the small variation delta u is converted into the direct-current voltage by adopting the peak value holding module, and repeated acquisition can be carried out by adapting to the rear-stage low-speed analog-to-digital conversion module. The requirement on the acquisition rate of the analog-digital conversion module is reduced, and the circuit is low in cost and high in cost performance.
(3) The data processing and calculating module of the main control unit performs digital filtering processing on repeated sampling data of the voltage variation sampling unit, so that the accuracy, the consistency and the repeatability of a calculation result are good.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
Fig. 1 is a schematic diagram of a power battery or super capacitor internal resistance testing system according to an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The invention provides a power battery or super capacitor internal resistance testing system which comprises a voltage variation sampling unit, a current sampling unit and a main control unit, wherein the main control unit respectively controls the voltage variation sampling unit and the current sampling unit and is respectively communicated with an upper computer and power battery or super capacitor testing equipment, as shown in figure 1.
One, main control unit
And after receiving the information from the upper computer and the power battery or super capacitor testing equipment, the main control unit processes and controls the voltage variation sampling unit and the current sampling unit to sample according to a communication protocol. The voltage variation sampling unit and the current sampling unit respectively sample the voltage variation delta u and the current i of the power battery or the super capacitor, the sampled digital quantity is transmitted to the main control unit, and then the digital quantity is transmitted to the upper computer and the power battery or the super capacitor testing equipment by the main control unit.
The upper computer is provided with a power battery or super capacitor testing process or power battery parameters and sends the power battery or super capacitor testing process or power battery parameters to the main control unit in an Ethernet communication mode, and the main control unit analyzes data and executes internal resistance testing according to a communication protocol after receiving the data.
The main control unit program operates in a manner that the information processing program is divided into a plurality of states by corresponding state words. The voltage variation sampling unit and the current sampling unit are communicated with the main control unit in a serial or parallel or shared memory mode.
The main control unit comprises a data processing and computing module, a control module and a communication module, and the communication module is communicated with the upper computer and the power battery or super capacitor testing equipment through the level conversion and isolation unit.
(1) Data processing and computing module
The method is used for processing the acquired data and calculating the internal resistance value.
(2) Control module
The device is used for judging the state according to the calculation result and the received information of the upper computer and the power battery or the super capacitor test equipment, and controlling the sampling and communication processes according to different states.
(3) Communication module
And the power battery or super capacitor test equipment is communicated with an upper computer and the power battery or super capacitor test equipment through a level conversion and isolation unit.
Two, voltage variation sampling unit
The voltage variation sampling unit comprises a voltage variation capturing module, a first filtering and amplifying module, a first peak holding module and a first analog-to-digital conversion module which are sequentially connected, and the first analog-to-digital conversion module is communicated with the main control unit.
(1) Voltage variation capturing module
The voltage capture device is used for capturing the small change voltage in the direct current or low-frequency voltage of the power battery or super capacitor voltage. The function of the device is to shield the direct current or low-frequency part of the voltage of the power battery or the super capacitor and take out the tiny rapid change part delta u.
(2) Filter and amplification module I
The method is used for filtering noise and interference in the signals and amplifying the signals, so that the quality of the signals is improved, and the sampling precision is ensured.
(3) Peak holding module
The method is used for changing the change signal into direct current, and is convenient for repeated acquisition of a subsequent circuit, so that the consistency and stability of sampling data are improved.
(4) Analog-to-digital conversion module I
The digital quantity conversion device is used for converting the analog quantity into the digital quantity and transmitting the digital quantity to the main control unit for data processing.
Third, current sampling unit
The current sampling unit comprises an I-V conversion module, a second filtering amplification module and a second analog-to-digital conversion module which are sequentially connected, and the second analog-to-digital conversion module is communicated with the main control unit.
(1) I-V conversion module
The method is used for converting a test large-current signal of the power battery or the super capacitor into a voltage signal which is easy to sample and process.
(2) Second filtering and amplifying module
The method is used for filtering noise and interference in the signals and amplifying the signals, so that the quality of the signals is improved, and the sampling precision is ensured.
(3) Analog-to-digital conversion module II
The digital quantity conversion device is used for converting the analog quantity into the digital quantity and transmitting the digital quantity to the main control unit for data processing.
A power battery or super capacitor internal resistance test method adopts the power battery or super capacitor internal resistance test system, and comprises the following processes:
(1) setting a power battery or super capacitor test process or parameter through an upper computer;
(2) the upper computer transmits the testing process or parameters of the power battery or the super capacitor to the main control unit in an Ethernet communication mode, and the main control unit analyzes data according to a communication protocol after receiving the information and controls the voltage variation sampling unit and the current sampling unit to acquire the data;
(3) based on the data of the voltage variation sampling unit and the current sampling unit, the main control unit processes the data, calculates a result and returns the result to an upper computer or transmits the result to power battery or super capacitor testing equipment.
The working process of the voltage variation sampling unit is as follows:
(1) the voltage variation capturing module shields the direct current or low-frequency part of the voltage of the power battery or the super capacitor, and takes out the small variation delta u;
(2) the filtering and amplifying module filters noise and interference in the signals according to the extracted small variable quantity delta u and amplifies the signals;
(3) the peak value holding module converts the peak value of the small variation delta u in the voltage u of the power battery or the super capacitor into direct current voltage;
(4) the analog-to-digital conversion module converts the analog quantity into digital quantity and transmits the digital quantity to the main control unit for data processing.
The working process of the current sampling unit is as follows:
(1) the I-V conversion module converts a test heavy current signal of a power battery or a super capacitor into a voltage signal which is easy to sample and process;
(2) the second filtering and amplifying module filters noise and interference in the signals and amplifies the signals;
(3) the analog-to-digital conversion module II converts the analog quantity into digital quantity and transmits the digital quantity to the main control unit for data processing.
As shown in fig. 1, the internal resistance testing system according to the embodiment of the present invention is based on a TI C2000 digital processor platform, and further includes an EEPROM, a watchdog reset, a working state indication, a level shift and isolation, a display screen, and the like.
The overall working principle and the flow of the system are as follows:
a user writes a test process in the upper computer software, the test process is issued to the internal resistance test system through modes such as Ethernet, the main control unit analyzes data according to a specified communication protocol after receiving the data and transmits the data to the power battery or the super capacitor test equipment, the power battery or the super capacitor test equipment CAN output test current by adopting communication modes such as CAN and the like between the main control unit and the power battery or the super capacitor test equipment. And meanwhile, the main control unit controls the voltage variation sampling unit and the current sampling unit to sample data and calculate, and the calculated internal resistance result is respectively returned to the upper computer and the power battery or the super capacitor testing equipment through the communication module for use.
For example: in the process of testing the internal resistance of the super capacitor, three states of charging, standing and discharging exist. A user compiles' 10A charging 10s on an upper computer, stands for 10s, then discharges for 10s at 96A, simultaneously tests the testing process of the internal resistance value and sends the testing process to a main control unit of the internal resistance testing system through the Ethernet, the main control unit analyzes the testing process according to the received information and transmits data to power battery or super capacitor testing equipment, and the power battery or the super capacitor testing equipment outputs charging and discharging currents according to requirements. Meanwhile, the main control unit controls the voltage variation sampling unit and the current sampling unit to collect data in real time, processes and calculates the data when the main control unit judges that the discharge current is collected, calculates the internal resistance value, and transmits the internal resistance test data to an upper computer and power battery or super capacitor test equipment for use through the communication module.
The working principle and the function of each part in the figure 1 are as follows:
voltage variation sampling unit: the device is responsible for shielding direct current or low-frequency voltage in the voltage of the power battery or the super capacitor, capturing tiny rapidly-changed voltage in the voltage, sampling and processing the voltage, and converting the voltage into usable digital quantity for the main control unit to use.
A current sampling unit: and the system is responsible for sampling the charging and discharging current value of the power battery or the super capacitor and converting the charging and discharging current value into digital quantity for the main control unit to use.
An EEPROM: the method has the characteristic of no loss of power failure data, is used for storing important data, recording program breakpoints and the like, and provides guarantee for state recovery after the system is restarted.
Resetting the watchdog: and the running state of the system is monitored, and the system is prevented from being halted.
And (3) indicating the working state: the status is indicated by light emitting diode lights of various colors.
Level conversion and isolation, which is responsible for converting the level and matching the level between circuits with various levels; the isolation circuit can inhibit interference and noise, improve the reliability of the system and prevent the circuit from being damaged.
A display screen: and displaying the data and the state information in the running process.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The power battery or super capacitor internal resistance testing system is characterized by comprising a voltage variation sampling unit, a current sampling unit and a main control unit, wherein the main control unit respectively controls the voltage variation sampling unit and the current sampling unit and is respectively communicated with an upper computer and power battery or super capacitor testing equipment;
the voltage variation sampling unit comprises a voltage variation capturing module, a first filtering and amplifying module, a peak holding module and a first analog-to-digital conversion module which are sequentially connected, and the first analog-to-digital conversion module is communicated with the main control unit;
the current sampling unit comprises an I-V conversion module, a second filtering amplification module and a second analog-to-digital conversion module which are sequentially connected, and the second analog-to-digital conversion module is communicated with the main control unit.
2. The power battery or super capacitor internal resistance testing system of claim 1, wherein the main control unit comprises a data processing and computing module, a control module and a communication module, and the communication module communicates with an upper computer and the power battery or super capacitor testing device through a level conversion and isolation unit.
3. The power battery or super capacitor internal resistance testing system of claim 1, wherein the voltage variation sampling unit and the current sampling unit communicate with the main control unit in a serial or parallel or shared memory manner.
4. A power battery or super capacitor internal resistance test method, which adopts the power battery or super capacitor internal resistance test system of claim 1, characterized by comprising the following processes:
(1) setting a power battery or super capacitor test process or parameter through an upper computer;
(2) the upper computer transmits the testing process or parameters of the power battery or the super capacitor to the main control unit in an Ethernet communication mode, and the main control unit analyzes data according to a communication protocol after receiving the information and controls the voltage variation sampling unit and the current sampling unit to acquire the data;
(3) based on the data of the voltage variation sampling unit and the current sampling unit, the main control unit processes the data, calculates a result and returns the result to an upper computer or transmits the result to power battery or super capacitor testing equipment.
5. The power battery or super capacitor internal resistance testing system as claimed in claim 4, wherein the voltage variation sampling unit is operated as follows:
(1) the voltage variation capturing module shields the direct current or low-frequency part of the voltage of the power battery or the super capacitor, and takes out the small variation delta u;
(2) the filtering and amplifying module filters noise and interference in the signals according to the extracted small variable quantity delta u and amplifies the signals;
(3) the peak value holding module converts the peak value of the small variation delta u in the voltage u of the power battery or the super capacitor into direct current voltage;
(4) the analog-to-digital conversion module converts the analog quantity into digital quantity and transmits the digital quantity to the main control unit for data processing.
6. The power battery or super capacitor internal resistance testing system as claimed in claim 4, wherein the current sampling unit works as follows:
(1) the I-V conversion module converts a test heavy current signal of a power battery or a super capacitor into a voltage signal which is easy to sample and process;
(2) the second filtering and amplifying module filters noise and interference in the signals and amplifies the signals;
(3) the analog-to-digital conversion module II converts the analog quantity into digital quantity and transmits the digital quantity to the main control unit for data processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010599516.8A CN111781520A (en) | 2020-06-28 | 2020-06-28 | Power battery or super capacitor internal resistance test system and test method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010599516.8A CN111781520A (en) | 2020-06-28 | 2020-06-28 | Power battery or super capacitor internal resistance test system and test method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113281607A (en) * | 2021-04-30 | 2021-08-20 | 南通江海电容器股份有限公司 | Detection system and display device based on super capacitor module monomer voltage |
| CN113866657A (en) * | 2021-09-30 | 2021-12-31 | 济南耀锐电子科技有限公司 | Lithium battery internal resistance test system |
| CN114325199A (en) * | 2022-01-04 | 2022-04-12 | 中国船舶重工集团公司第七一一研究所 | Supercapacitor internal resistance detection method and device and storage medium |
-
2020
- 2020-06-28 CN CN202010599516.8A patent/CN111781520A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113281607A (en) * | 2021-04-30 | 2021-08-20 | 南通江海电容器股份有限公司 | Detection system and display device based on super capacitor module monomer voltage |
| CN113866657A (en) * | 2021-09-30 | 2021-12-31 | 济南耀锐电子科技有限公司 | Lithium battery internal resistance test system |
| CN113866657B (en) * | 2021-09-30 | 2023-07-14 | 济南耀锐电子科技有限公司 | Lithium battery internal resistance test system |
| CN114325199A (en) * | 2022-01-04 | 2022-04-12 | 中国船舶重工集团公司第七一一研究所 | Supercapacitor internal resistance detection method and device and storage medium |
| CN114325199B (en) * | 2022-01-04 | 2023-11-14 | 中国船舶集团有限公司第七一一研究所 | Method and device for detecting internal resistance of super capacitor and storage medium |
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