CN205229426U - Detect power battery residual capacity's device - Google Patents
Detect power battery residual capacity's device Download PDFInfo
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- CN205229426U CN205229426U CN201521079570.0U CN201521079570U CN205229426U CN 205229426 U CN205229426 U CN 205229426U CN 201521079570 U CN201521079570 U CN 201521079570U CN 205229426 U CN205229426 U CN 205229426U
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- 238000001514 detection method Methods 0.000 claims abstract description 40
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- 238000004364 calculation method Methods 0.000 description 5
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- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
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Abstract
The utility model relates to a detect power battery residual capacity's device, including battery, single -chip module, display module, outer circuit signal detection module and alarm module, the display module adopts the digital display tube of LED, and the display module links to each other with single -chip module with the interface that outer circuit signal detection module passes through the single -chip module both ends, and outer circuit signal detection module includes electric current detection module, voltage detection module and temperature detection module to convey it to single -chip module through the ADC digital analog conversion chip, single -chip module on be equipped with voltage register, electric current register and temperature register. Through gathering at the electric current that the power supply major loop produced the battery, when detecting electric current in the circuit for the zero hour, gather voltage and temperature data and deliver to the singlechip through the analog -to -digital conversion chip with it, deliver to the display with the result of gained at last and show.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to a device for detecting the residual capacity of a power battery, belonging to the technical field of electricity.
[ background of the invention ]
With the wide application of the storage battery, particularly in the electric vehicle industry, the rapid development of the industry brings people to more deeply know about the storage battery. People not only enjoy the convenience of traveling of the electric vehicle, but also are often troubled by the problems of charging speed, endurance, service life and the like of the storage battery of the electric vehicle. Especially, people often need to know the real-time status of the remaining capacity of the battery for more convenient travel. Moreover, the accurate knowledge of the residual capacity of the storage battery is of great importance for preventing the overcharge and overdischarge of the storage battery. Because the relationship between the battery parameters and the residual capacity is complex, some traditional methods for measuring the residual capacity of the battery, such as a density method, an open-circuit voltage method, an internal resistance method, an electric quantity accumulation method and the like, cannot accurately and quickly detect the residual capacity of the battery.
[ summary of the invention ]
The invention aims to: aiming at the defects and shortcomings of the prior art, the device for detecting the residual capacity of the power battery is provided, and the problems of low accuracy and poor real-time performance of the traditional method for detecting the residual capacity of the battery are solved.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention relates to a device for detecting the residual capacity of a power battery, which comprises a battery, a singlechip module, a display module, an external circuit signal detection module and an alarm module, wherein the display module adopts an LED digital display tube, the display module and the external circuit signal detection module are connected with the singlechip module through interfaces at two ends of the singlechip module, the external circuit signal detection module comprises a current detection module, a voltage detection module and a temperature detection module and transmits the current detection module and the temperature detection module to the singlechip module through an ADC (analog-to-digital converter), and the singlechip module is provided with a voltage register, a current register and a temperature register.
In the present invention: the voltage detection module consists of an operational amplifier, a resistor and a chip for providing reference voltage, wherein the operational amplifier adopts an LM324 with four operational amplifiers.
In the present invention: the current detection module consists of an operational amplifier and a resistor, and the operational amplifier part selects four LM324 of the operational amplifier.
In the present invention: the temperature detection module carries out temperature sensing acquisition through a DS18B20 digital temperature sensor and feeds back acquired signals to the single chip microcomputer module after processing.
In the present invention: the alarm module consists of an LED lamp and a PNP triode, and because the current output by the singlechip module is not enough to enable the LED lamp to work in a normal state, the current flowing through the LED lamp needs to be amplified by using one triode, so that the LED lamp can be in a high-brightness state to play a role in reminding.
After the method is adopted, the invention has the beneficial effects that: the method comprises the steps that current generated by a battery in a power supply main loop is collected, when the current in a circuit is detected to be zero, voltage and temperature data are collected and sent to a single chip microcomputer through an analog-to-digital conversion chip, the residual capacity is calculated through a certain algorithm, and finally the obtained result is sent to a display for display; if the measured current is not zero in the time set by the singlechip timer, the main loop is cut off for a short time, the current of the circuit is artificially zero, and the current, the voltage and the temperature data in the circuit are measured. When the voltage and the current in the circuit are collected, the designed operational amplifier circuit is applied.
[ description of the drawings ]
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, and are not to be considered limiting of the invention, in which:
FIG. 1 is a schematic diagram of the system architecture of the present invention;
FIG. 2 is a schematic diagram of the circuit of the present invention;
FIG. 3 is a schematic circuit diagram of a voltage detection module of the present invention;
FIG. 4 is a circuit schematic of the current sensing module of the present invention;
FIG. 5 is a schematic circuit diagram of a temperature sensing module of the present invention;
FIG. 6 is a schematic circuit diagram of an alarm module of the present invention;
FIG. 7 is a system workflow diagram of the present invention;
FIG. 8 is a data processing flow diagram of the present invention.
[ detailed description ] embodiments
The present invention will now be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and descriptions are provided only for the purpose of illustrating the present invention and are not to be construed as limiting the present invention.
As shown in fig. 1-8, a device for detecting the remaining capacity of a power battery comprises a battery, a single chip module, a display module, an external circuit signal detection module and an alarm module, wherein the display module adopts an LED digital display tube, the display module and the external circuit signal detection module are connected with the single chip module through interfaces at two ends of the single chip module, the external circuit signal detection module comprises a current detection module, a voltage detection module and a temperature detection module, and transmits the current detection module and the temperature detection module to the single chip module through an ADC digital-to-analog conversion chip, and the single chip module is provided with a voltage register, a current register and a temperature register.
The voltage detection module consists of an operational amplifier, a resistor and a chip for providing reference voltage, the operational amplifier adopts LM324 with four operational amplifiers, the rebound voltage range of the storage battery is between 10.5V and 13V, the input range of the A/D chip is 0 to 5V, the operational amplifier realizes the comparison of the rebound voltage and the reference voltage and outputs a voltage level suitable for A/D, the reference voltage Vref can generate 10V reference voltage by using AD584, and the voltage range of the output end is 0.5V to 3V and provides the voltage level for an A/D channel; in terms of selecting the resistor, since the differential amplifier circuit is selected, the following calculation is performed:
in order to facilitate the calculation of the amplified output voltage, the parameters can be symmetrical and taken，According to the principles of 'virtual short' and 'virtual break' of operational amplifier, the method comprises the following steps:
(1-1)
(1-2)
the formula (1-2) is obtained by simplifying the formula (1-1). In the formula,in order to be able to collect the voltage,the 10V reference voltage provided for AD584,is the voltage output to the analog-to-digital converter; from the above derivation, the output voltage should be equal to: (A)) Within the range of the measuring range of the analog-digital converter, the resistance value is 10K which is commonly used, namely10K. Wherein,=Vref，=Vi。
the current detection module consists of an operational amplifier and resistors, the operational amplifier part adopts four LM324 operational amplifiers, and the input current passes through the resistors 、Get itVoltage is applied, current collection is converted into voltage collection, voltage is taken out through a voltage follower, in order to reach the range which can be input by the A/D converter, the obtained voltage is input into a feedback amplifying circuit, and a signal suitable for the range of the analog-to-digital converter is obtained through amplification; the operational amplifier part still adopts the LM324 of four operational amplifiers; when the value of the resistor is taken, firstly, as the resistor for acquiring signals is connected in series to a main circuit of a battery power supply, the working current of a battery flowing through the resistor is generally larger, so that in order to avoid larger energy consumption, the resistance value is selected to be smaller, and the power is appropriately larger, wherein I select a customized 1m omega resistor and connect the two resistors in series for use; the obtained voltage is several millivolts, and obviously cannot reach the range of the analog-to-digital converter, so the voltage is taken out by the designed voltage follower and then amplified and output by the operational amplifier; when selecting the resistance of the amplifying part, the amplification factor should be considered, several millivolts is amplified to several volts, the factor is about 300-:
according to the principles of 'virtual short' and 'virtual break', there are
(1-3)
(1-4)
The formula (1-4) is obtained by simplifying the formula (1-3). In the formula, Is the preceding stage voltage of the voltage follower output,to amplify the voltage input to the input of the analog-to-digital converter, it is possible to select300, the output voltage is a value which is in accordance with the measuring range of the analog-to-digital converter, and the practical condition of the resistor is considered to be selected=300K,=1K。
The temperature detection module carries out temperature sensing acquisition through a DS18B20 digital temperature sensor and feeds back acquired signals to the single chip microcomputer module after processing. The alarm module consists of an LED lamp and a PNP triode, and because the current output by the singlechip module is not enough to enable the LED lamp to work in a normal state, the current flowing through the LED lamp needs to be amplified by using one triode, so that the LED lamp can be in a high-brightness state to play a role in reminding.
The invention discloses a method for detecting the residual capacity of a power battery, which comprises the following steps:
(1) the current generated by the battery in the power supply main loop is collected, and when the current in the circuit is detected to be zero, voltage and temperature data are collected and sent to the single chip microcomputer through the ADC chip;
(2) calculating the remaining capacity of the battery: the relation between the remaining capacity of the battery and the battery rebound voltage and temperature is the key for determining the output display quantity, and therefore, the functional relation among the three is as follows:
A. When the rebound voltage value of the battery is () When the voltage is more than or equal to 11.8V, the functional relation between the residual capacity (SOC) and the rebound voltage is as follows:
at this time, the influence of the ambient temperature on the residual capacity is based on the temperature of 25 ℃, when the ambient temperature rises by 1 ℃, the residual capacity is reduced by about 1%, and the influence is considered in the calculation result and named as a first temperature correction mode;
B. when the rebound voltage value is () Between 0-11.8V, the functional relationship between remaining capacity (SOC) and rebound voltage is:
at this time, since the influence of the ambient temperature on the result is not so great, the temperature is increased by about 2 ℃, and the remaining capacity is decreased by about 1%, the influence is considered in the calculation result, and the calculation result is named as a second temperature correction mode;
(3) the singlechip acquires the rebound voltage signal and the temperature signal, obtains the residual capacity according to the function algorithm and then sends the residual capacity to the display;
(4) and when the residual capacity of the battery is less than 10% of the total capacity, the alarm module is started.
The above description is only a preferred embodiment of the present invention, and all equivalent changes or modifications of the structure, characteristics and principles described in the present invention are included in the scope of the present invention.
Claims (5)
1. A device for detecting the residual capacity of a power battery is characterized in that: the display module adopts an LED digital display tube, the display module and the external circuit signal detection module are connected with the single chip microcomputer module through interfaces at two ends of the single chip microcomputer module, the external circuit signal detection module comprises a current detection module, a voltage detection module and a temperature detection module and transmits the current detection module, the voltage detection module and the temperature detection module to the single chip microcomputer module through an ADC (analog-to-digital converter) chip, and the single chip microcomputer module is provided with a voltage register, a current register and a temperature register.
2. The device for detecting the residual capacity of the power battery according to claim 1, wherein: the voltage detection module consists of an operational amplifier, a resistor and a chip for providing reference voltage, wherein the operational amplifier adopts an LM324 with four operational amplifiers.
3. The device for detecting the residual capacity of the power battery according to claim 1, wherein: the current detection module consists of an operational amplifier and a resistor, and the operational amplifier part selects four LM324 of the operational amplifier.
4. The device for detecting the residual capacity of the power battery according to claim 1, wherein: the temperature detection module carries out temperature sensing acquisition through a DS18B20 digital temperature sensor and feeds back acquired signals to the single chip microcomputer module after processing.
5. The device for detecting the residual capacity of the power battery according to claim 1, wherein: the alarm module consists of an LED lamp and a PNP triode, and because the current output by the singlechip module is not enough to enable the LED lamp to work in a normal state, the current flowing through the LED lamp needs to be amplified by using one triode, so that the LED lamp can be in a high-brightness state to play a role in reminding.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201521079570.0U CN205229426U (en) | 2015-12-23 | 2015-12-23 | Detect power battery residual capacity's device |
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| CN201521079570.0U CN205229426U (en) | 2015-12-23 | 2015-12-23 | Detect power battery residual capacity's device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105467326A (en) * | 2015-12-23 | 2016-04-06 | 南京工程学院 | Device and method for detecting surplus capacity of power battery |
| CN109193670A (en) * | 2018-08-16 | 2019-01-11 | 广东阿尔派智能电网有限公司 | A kind of protective device and method of self-powered circuit |
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2015
- 2015-12-23 CN CN201521079570.0U patent/CN205229426U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105467326A (en) * | 2015-12-23 | 2016-04-06 | 南京工程学院 | Device and method for detecting surplus capacity of power battery |
| CN109193670A (en) * | 2018-08-16 | 2019-01-11 | 广东阿尔派智能电网有限公司 | A kind of protective device and method of self-powered circuit |
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Granted publication date: 20160511 Termination date: 20161223 |