CN212321807U - Power battery or super capacitor internal resistance test system - Google Patents
Power battery or super capacitor internal resistance test system Download PDFInfo
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- CN212321807U CN212321807U CN202021223295.6U CN202021223295U CN212321807U CN 212321807 U CN212321807 U CN 212321807U CN 202021223295 U CN202021223295 U CN 202021223295U CN 212321807 U CN212321807 U CN 212321807U
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Abstract
The utility model discloses a power battery or super capacitor internal resistance test system, this system includes voltage variation sampling unit, current sampling unit and main control unit, voltage variation sampling unit and current sampling unit are controlled respectively to the main control unit, and the main control unit communicates with host computer and power battery or super capacitor test equipment respectively; 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 utility model discloses a system test resolution ratio is high, the uniformity is good, with low costs, the accuracy is good.
Description
Technical Field
The utility model relates to a power battery and super capacitor test technical field, in particular to power battery or super capacitor internal resistance test system.
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.
SUMMERY OF THE UTILITY MODEL
For solving the technical problem, the utility model provides a power battery or super capacitor internal resistance test system to reach the purpose that test resolution ratio is high, the uniformity is good, with low costs, the accuracy is good.
In order to achieve the above purpose, the technical scheme of the utility model 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 utility model provides a power battery or super capacitor internal resistance test system has following beneficial effect:
(1) the utility model discloses directly catch small change amount delta u in power battery or super capacitor voltage u and sample and handle, because small change amount delta u's independent capture has high resolution and high uniformity characteristics with the sampling method, and the precision of current change amount delta i influences the test result lessly, so under the fixed condition of analog-to-digital converter chip digit, the contrast directly samples power battery or super capacitor's voltage u and carries out analog-to-digital conversion, then calculate change amount delta u's method through the difference of u's digital value, the internal resistance r who calculates also has the characteristics of high resolution and high uniformity.
(2) The utility model discloses a peak value of small change Δ u is turned into DC voltage to the peak value of peak value holding module, can adapt to the low-speed analog-to-digital conversion module of back level and carry out the repeated collection many times. 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 utility model provides a power battery or super capacitor internal resistance test system, as shown in figure 1, including voltage variation sampling unit, electric current sampling unit and main control unit, main control unit controls voltage variation sampling unit and electric current sampling unit respectively, and main control unit communicates with host computer and power battery or super capacitor test equipment respectively.
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 utility model discloses internal resistance test system is based on TI C2000 digital processor platform, has still included parts such as EEPROM, watchdog resets, operating condition instruction, level transition and isolation, display screen.
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 (3)
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.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021223295.6U CN212321807U (en) | 2020-06-28 | 2020-06-28 | Power battery or super capacitor internal resistance test system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021223295.6U CN212321807U (en) | 2020-06-28 | 2020-06-28 | Power battery or super capacitor internal resistance test system |
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| CN212321807U true CN212321807U (en) | 2021-01-08 |
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| CN202021223295.6U Active CN212321807U (en) | 2020-06-28 | 2020-06-28 | Power battery or super capacitor internal resistance test system |
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