CN109901078B - Internal resistance and temperature measuring circuit for single storage battery - Google Patents
Internal resistance and temperature measuring circuit for single storage battery Download PDFInfo
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Abstract
The invention provides a circuit for measuring internal resistance and temperature of a single storage battery, wherein in the circuit, a control unit sends a PWM (pulse-width modulation) signal to a current control unit so that the single storage battery to be measured provides a discharge current corresponding to the PWM signal to a discharge loop; meanwhile, the control unit acquires the current value of the discharge current through the current control unit and acquires the voltage value of the discharge voltage provided by the single storage battery to be tested to the discharge loop through the sampling unit; and acquiring the temperature value of the cathode of the measured single storage battery through a temperature measuring circuit. The circuit provided by the invention calculates the internal resistance of the tested storage battery by measuring the current value and the voltage value of the discharge loop, and simultaneously obtains the temperature value of the cathode of the tested storage battery in real time through the temperature measuring circuit; whether the battery capacity of the single storage battery to be detected is qualified or not is analyzed and judged according to the measured internal resistance data of the single storage battery and the temperature data of the negative electrode, and the accuracy of judging the battery capacity of the storage battery is improved.
Description
Technical Field
The invention relates to the technical field of storage batteries, in particular to a circuit for measuring internal resistance and temperature of a single storage battery.
Background
The storage battery is used as a backup power supply of the power system, the actual battery capacity which can be provided for a load in the discharging process of the storage battery has very important significance for ensuring the safe operation of the power system, and therefore in order to ensure the safe reliability of the power system, the storage battery needs to be detected to judge whether the battery capacity of the current storage battery is qualified or not.
The inventor finds that, in the prior art, the battery capacity of the storage battery is generally judged by detecting the discharge voltage of the storage battery. In fact, the factors influencing the capacity of the storage battery are not only the discharge voltage of the storage battery, so that the method of measuring the discharge voltage of the storage battery cannot accurately judge whether the capacity of the storage battery is qualified.
Disclosure of Invention
In view of this, the embodiment of the present invention provides an internal resistance and temperature measurement circuit for a single storage battery, which obtains an internal resistance of the storage battery by detecting a current value and a voltage value of a discharge loop of the storage battery in real time, obtains a temperature value of a negative electrode of the storage battery by the temperature measurement circuit, and detects whether a current battery capacity of the storage battery is qualified from multiple aspects by using the internal resistance of the storage battery and the temperature of the negative electrode of the storage battery.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
a cell internal resistance and temperature measuring circuit comprises: the device comprises a first photoelectric coupler, a second photoelectric coupler, a current control unit, a sampling unit, a temperature measuring circuit, a control unit and an isolation driving circuit;
the first end of the first photoelectric coupler is connected with the anode of the single storage battery to be detected, and the second end of the first photoelectric coupler is connected with the cathode of the single storage battery to be detected sequentially through the current control unit and the second photoelectric coupler to form a discharge loop;
the first end of the control unit is connected with the first end of the current control unit through the isolation driving circuit and sends a PWM (pulse width modulation) signal to the current control unit, so that the current control unit controls the single storage battery to be tested to provide a discharge current corresponding to the PWM signal to the discharge loop;
the second end of the control unit is connected with the second end of the current control unit, and the current value of the discharge current is obtained through the current control unit;
the first end of the sampling unit is connected with the common end of the first photoelectric coupler and the current control unit; the second end of the second photoelectric coupler is connected with the common end of the second photoelectric coupler and the current control unit; the third end is connected with the third end of the control unit;
the control unit acquires a voltage value of a discharge voltage provided by the single storage battery to be tested to the discharge loop through the sampling unit;
the first end of the temperature measuring circuit is connected with the negative electrode of the measured single storage battery, and the second end of the temperature measuring circuit is connected with the fourth end of the control unit;
and the control unit acquires the temperature value of the cathode of the measured single storage battery through the temperature measuring circuit.
In the above circuit, optionally, the current control unit includes:
the power circuit comprises a power resistor, a power tube, a current detection circuit and a discharge switch;
the first end of the power resistor is connected with the second end of the first photoelectric coupler, and the second end of the power resistor is connected with the first end of the discharge switch through the power tube and the current detection circuit in sequence; the second end of the discharge switch is connected with the second photoelectric coupler, and the second end of the discharge switch is grounded;
the base electrode of the power tube is used as the first end of the current control unit and is connected with the first end of the control unit;
and the first end of the current detection circuit is used as the second end of the current control unit and is connected with the second end of the control unit.
In the above circuit, optionally, the sampling unit includes: a sampling circuit and a follower;
the first end of the sampling circuit is the first end of the sampling unit; the second end is the second end of the sampling unit, and the third end is connected with the first end of the follower;
and the second end of the follower is the third end of the sampling unit.
The above circuit, optionally, further includes: a communication unit;
the communication unit includes: a photoelectric coupling isolation circuit and a transceiver;
and the first end of the photoelectric coupling isolation circuit is connected with the fifth end of the control unit, and the second end of the photoelectric coupling isolation circuit is connected with the transceiver.
The storage battery internal resistance and temperature measuring device comprises a plurality of single storage battery internal resistance and temperature measuring circuits, wherein each single storage battery internal resistance and temperature measuring circuit is used for measuring the internal resistance and temperature of each single storage battery.
The embodiment of the invention provides a circuit for measuring internal resistance and temperature of a single storage battery, which comprises: the device comprises a first photoelectric coupler, a second photoelectric coupler, a current control unit, a sampling unit, a temperature measuring circuit, a control unit and an isolation driving circuit; the first end of the first photoelectric coupler is connected with the anode of the single storage battery to be detected, and the second end of the first photoelectric coupler is connected with the cathode of the single storage battery to be detected through the current control unit and the second photoelectric coupler in sequence to form a discharge loop; the control unit sends a PWM signal to a current control unit, so that the current control unit controls the single storage battery to be tested to provide discharge current corresponding to the PWM signal to the discharge loop; meanwhile, the control unit acquires the current value of the discharge current through the current control unit and acquires the voltage value of the discharge voltage provided by the single storage battery to be tested to the discharge loop through the sampling unit; and acquiring the temperature value of the cathode of the measured single storage battery through the temperature measuring circuit. The circuit provided by the embodiment of the invention calculates the internal resistance of the tested storage battery by measuring the current value and the voltage value of the discharge loop, and simultaneously obtains the temperature value of the cathode of the tested storage battery in real time through the temperature measuring circuit; the circuit provided by the invention judges whether the battery capacity of the single detected storage battery is qualified or not through the internal resistance data of the storage battery and the temperature data of the negative electrode obtained through measurement, thereby avoiding the inaccuracy of judging the battery capacity of the storage battery only through measuring the discharge voltage of the storage battery in the prior art.
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, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of a circuit for measuring internal resistance and temperature of a single storage battery according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a circuit for measuring internal resistance and temperature of a single battery according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a circuit for measuring internal resistance and temperature of a single battery according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a circuit for measuring internal resistance and temperature of a single battery according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a device for measuring internal resistance and temperature of a battery according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The storage battery is used as a backup power source of the power system, the safety and the reliability of the power system are directly influenced by the capacitance of the storage battery, and the inventor finds that the capacitance of the single storage battery has a great relationship with the internal resistance and the temperature of the storage battery. The larger the internal resistance of the storage battery is, the lower the capacitance is; the lower the temperature is, the more crystals on the negative plate of the storage battery are, and the internal resistance of the storage battery is also higher; meanwhile, the lower the temperature, the less active the active material of the secondary battery, resulting in a reduction in the capacity of the secondary battery. However, when the temperature is too high, for example, the temperature exceeds 60 ℃, the capacitance of the storage battery is also reduced, so that the internal resistance and the temperature of the storage battery are important factors influencing the capacitance of the storage battery. Therefore, the invention provides a circuit for measuring the internal resistance and the temperature of the single storage battery, which can analyze and judge whether the battery capacity of the single storage battery is qualified or not by measuring the internal resistance of the single storage battery and the negative electrode temperature of the storage battery.
Referring to fig. 1, a schematic diagram of a circuit for measuring internal resistance and temperature of a single storage battery according to an embodiment of the present invention is shown, including: a first photocoupler 101, a second photocoupler 102, a current control unit 103, a sampling unit 104, a temperature measurement circuit 105, a control unit 106 and an isolation drive circuit 107;
the first end of the first photoelectric coupler 101 is connected with the anode of the single storage battery to be tested, and the second end of the first photoelectric coupler is connected with the cathode of the single storage battery to be tested through the current control unit 103 and the second photoelectric coupler 102 in sequence to form a discharge loop;
a first end of the control unit 106 is connected to a first end of the current control unit 103 through the isolation driving circuit 107, and the first end of the control unit 106 sends a Pulse Width Modulation (PWM) signal to the current control unit 103, so that the current control unit controls the single battery to be tested to provide a discharge current corresponding to the PWM signal to the discharge circuit;
a second end of the control unit 106 is connected to a second end of the current control unit 103, and the second end of the control unit 106 obtains a current value of the discharge current through the current control unit 103;
a first end of the sampling unit 104 is connected with a common end of the first photocoupler 101 and the current control unit 103; the second end is connected with the common end of the second photoelectric coupler 102 and the current control unit 103; the third terminal is connected with the third terminal of the control unit 106;
the control unit 106 obtains a voltage value of a discharge voltage provided by the tested single storage battery to the discharge loop through the sampling unit 104;
a first end of the temperature measuring circuit 105 is connected with a negative electrode of the measured single storage battery, and a second end is connected with a fourth end of the control unit 106;
the control unit 106 obtains the temperature value of the negative electrode of the measured single storage battery through the temperature measuring circuit 105.
In the present embodiment, the functions of the circuit components are expressed as follows:
the control unit 106: during the work process of measuring the internal resistance and the temperature of the storage battery, a PWM signal is sent to an isolation driver 107, and during the sending of the PWM signal, a control unit 106 synchronously obtains a current value I of a discharge loop through a current control unit 103, obtains a voltage value U of the discharge loop through a sampling unit 104, obtains a temperature value of the cathode of the storage battery to be measured through a temperature measuring circuit 105, and calculates the internal resistance of the storage battery to be measured by using R ═ U/I-R according to the obtained current value I and the voltage value U. Wherein R is the resistance value of the current control unit;
the isolation driver 107: the PWM signal is transmitted to the current control unit 103 after passing through the isolation driver 107;
the current control unit 103: the device is used for receiving the PWM signal transmitted by the isolation driver 107 and working in the state of the PWM signal according to the duty ratio of the PWM signal, so that the single storage battery to be tested can send a discharge pulse signal corresponding to the PWM signal, and the discharge pulse signal provides a signal of current and voltage for a discharge loop; the current control unit 103 detects the current value of the discharge current at the same time, so that the control unit can obtain the current value of the discharge current in real time;
the first and second photocouplers 101 and 102: in the working process of measuring the internal resistance and the temperature of the storage battery, the positive and negative ends of the single storage battery to be measured generate discharge pulse signals synchronous with the PWM signals, the first photoelectric coupler and the second photoelectric coupler respectively collect the positive discharge pulse signals and the negative discharge pulse signals of the storage battery to be measured, and couple the received signals to an output port for output by taking light as a medium, so that 'electricity-light-electricity' conversion is realized, and the insulation between the storage battery to be measured and a discharge loop plays a role in protecting the discharge loop;
the sampling circuit 104: the sampling unit 104 is used for acquiring a discharge pulse signal output by the first photoelectric coupler and a discharge pulse signal output by the second photoelectric coupler in real time, so that the control unit 106 can acquire a voltage value U of a discharge voltage provided by the tested storage battery to the discharge loop in real time;
the temperature measurement circuit 105: the temperature measuring device is used for measuring the temperature of the cathode of the measured storage battery and sending the measured data to the control unit 106, so that the control unit can obtain the temperature value of the cathode of the measured single storage battery in real time.
In this embodiment, it should be noted that the duty ratio of the PWM signal is changed in real time; when the duty ratio of the PWM signal changes, the discharge pulse signal sent by the single storage battery to be tested also changes synchronously, so that the voltage and the current of the discharge loop also change correspondingly. The current and the current of the discharge loop can be changed by changing the duty ratio of the PWM signal, so that the change rule of the internal resistance can be obtained, and meanwhile, the average value of the internal resistance can be taken as the final internal resistance value of the tested storage battery, so that the measured internal resistance of the storage battery is more accurate.
In this embodiment, optionally, the control unit may be a single chip microcomputer;
in this embodiment, optionally, the temperature measuring circuit measures the temperature of the negative electrode of the measured single battery by using a digital temperature sensor DS18B 20.
The embodiment of the invention provides a circuit for measuring internal resistance and temperature of a single storage battery, which comprises: the device comprises a first photoelectric coupler, a second photoelectric coupler, a current control unit, a sampling unit, a temperature measuring circuit, a control unit and an isolation driving circuit; the first end of the first photoelectric coupler is connected with the anode of the single storage battery to be detected, and the second end of the first photoelectric coupler is connected with the cathode of the single storage battery to be detected through the current control unit and the second photoelectric coupler in sequence to form a discharge loop; the control unit sends a PWM signal to a current control unit, so that the current control unit controls the single storage battery to be tested to provide discharge current corresponding to the PWM signal to the discharge loop; meanwhile, the control unit acquires the current value of the discharge current through the current control unit and acquires the voltage value of the discharge voltage provided by the single storage battery to be tested to the discharge loop through the sampling unit; and acquiring the temperature value of the cathode of the measured single storage battery through the temperature measuring circuit. The circuit provided by the embodiment of the invention calculates the internal resistance of the tested storage battery by measuring the current value and the voltage value of the discharge loop, and simultaneously obtains the temperature value of the cathode of the tested storage battery in real time through the temperature measuring circuit; the circuit provided by the invention judges whether the battery capacity of the single detected storage battery is qualified or not through the internal resistance data of the storage battery and the temperature data of the negative electrode obtained through measurement, thereby avoiding the inaccuracy of judging the battery capacity of the storage battery only through measuring the discharge voltage of the storage battery in the prior art.
Referring to fig. 2 and fig. 1 in combination, another schematic circuit diagram of a circuit for measuring internal resistance and temperature of a single battery according to an embodiment of the present invention is shown, where the current control unit 103 may specifically include:
a power resistor 201, a power tube 202, a current detection circuit 203, and a discharge switch 204;
a first end of the power resistor 201 is connected with a second end of the first photoelectric coupler 101, and the second end is connected with a first end of the discharge switch 204 through the power tube 202 and the current detection circuit 203 in sequence; a second end of the discharge switch 204 is connected to the second photocoupler 102, and a second end of the discharge switch 204 is grounded;
the base electrode of the power tube 202 is used as the first end of the current control unit 103 and is connected with the first end of the control unit 106;
a first terminal of the current detection circuit 203 serves as a second terminal of the current control unit 103, and is connected to a second terminal of the control unit 106.
In this embodiment, the resistance value of the power resistor 201 is R, which is used to provide a suitable load for the single battery to be tested, so that the battery to be tested can discharge with a stable discharge pulse signal.
In this embodiment, the power tube 202 is configured to receive the PWM signal transmitted by the isolation driver 107, and operate in the state of the PWM signal according to the duty ratio of the PWM signal, so as to control the single battery under test to send a discharge pulse signal corresponding to the PWM signal.
In this embodiment, the current detection circuit 203 is configured to measure the current value of the discharge current in real time, so that the control unit 106 can obtain the current value of the discharge current in real time.
In this embodiment, the discharging switch 204 is in a closed state during the discharging process of the tested battery.
In the circuit provided by the embodiment of the present invention, the current control unit specifically includes: the power circuit comprises a power resistor, a power tube, a current detection circuit and a discharge switch; the power resistor can enable the tested storage battery to discharge in a stable discharge pulse; the power tube works in the state of the PWM signal according to the duty ratio of the PWM signal, so that the single storage battery to be tested sends a discharge pulse signal corresponding to the PWM signal, when the duty ratio of the PWM signal changes, the discharge pulse signal sent by the single storage battery to be tested also changes, and the current of a discharge loop also changes; the current detection circuit can detect the current value of the discharge loop in real time, so that the control unit can obtain a plurality of groups of current value data, and the accuracy of calculating the internal resistance is improved.
Referring to fig. 3 in conjunction with fig. 2, a further circuit schematic diagram of the circuit for measuring internal resistance and temperature of the single storage battery according to the embodiment of the present invention is shown, where the sampling unit specifically includes: a sampling circuit 301 and a follower 302;
the first end of the sampling circuit 301 is the first end of the sampling unit 104; the second end is the second end of the sampling unit 104, and the third end is connected with the first end of the follower 302;
the second terminal of the follower 302 is the third terminal of the sampling unit 104.
In this embodiment, the sampling circuit 301 is configured to receive the discharge pulse signals output by the first photocoupler 101 and the second photocoupler 102, and send voltage signals corresponding to the discharge pulse electrical signals to the follower 302;
the follower 302 is configured to receive the voltage signal transmitted by the sampling circuit 301, and send the voltage signal to the control unit 106, so that the control unit 106 can obtain the voltage value U of the discharge voltage provided by the measured storage battery to the discharge circuit in real time through the voltage signal.
In this embodiment, the follower 302 has high input impedance and low output impedance, so that the discharge loop and the control unit can be insulated from each other, and the output voltage signal can be ensured not to be distorted.
In the circuit provided by the embodiment of the present invention, the sampling unit specifically includes: the sampling circuit and the follower are used for acquiring voltage signals of the tested storage battery in real time by adopting the circuit and sending the voltage signals to the control unit through the follower, so that the control unit follower can obtain data of a plurality of groups of battery voltages, and the accuracy of calculating the internal resistance is improved.
Referring to fig. 4 in combination with fig. 3, there is shown another schematic circuit diagram of the circuit for measuring internal resistance and temperature of the single battery according to the embodiment of the present invention, where the circuit according to the embodiment of the present invention further includes: a communication unit;
the communication unit includes: a photocoupling isolation circuit 401 and a transceiver 402;
the first end of the photocoupling isolation circuit 401 is connected to the fifth end of the control unit 106, and the second end is connected to the transceiver 402.
In this embodiment, the photocoupling isolation circuit 401 is used to insulate the control unit 106 from the external circuit, so as to prevent the control unit from being damaged by the external circuit, and the data signal transmitted by the controller is transmitted to the transceiver 402 through the photocoupling isolation circuit 401;
in this embodiment, the transceiver 402 is configured to upload the data signal transmitted by the control unit to a computer server, so that a worker can obtain the internal resistance data and the negative temperature data of the single storage battery.
In the circuit provided by the embodiment of the present invention, the communication unit specifically includes: the photoelectric coupling isolation circuit can realize the insulation of the control unit and the external circuit, ensures that the control unit is not damaged by the high voltage of the external circuit, and simultaneously uploads the internal resistance data and the negative temperature data of the single storage battery to be tested to the computer server through the interconnection of the transceiver and the computer server, so that a worker can analyze and judge whether the tested storage battery is qualified or not according to the internal resistance data and the negative temperature data of the single storage battery.
Referring to fig. 5, the present invention further provides a device for measuring internal resistance and temperature of a battery, the device includes a plurality of circuits for measuring internal resistance and temperature of single batteries, each of the circuits for measuring internal resistance and temperature of single batteries is used for measuring internal resistance and temperature of each single battery.
Wherein, monomer battery internal resistance and temperature measurement circuit includes: the device comprises a first photoelectric coupler, a second photoelectric coupler, a current control unit, a sampling unit, a temperature measuring circuit, a control unit and an isolation driving circuit;
the first end of the first photoelectric coupler is connected with the anode of the single storage battery to be detected, and the second end of the first photoelectric coupler is connected with the cathode of the single storage battery to be detected sequentially through the current control unit and the second photoelectric coupler to form a discharge loop;
the first end of the control unit is connected with the first end of the current control unit through the isolation driving circuit and sends a PWM (pulse width modulation) signal to the current control unit, so that the current control unit controls the single storage battery to be tested to provide a discharge current corresponding to the PWM signal to the discharge loop;
the second end of the control unit is connected with the second end of the current control unit, and the current value of the discharge current is obtained through the current control unit;
the first end of the sampling unit is connected with the common end of the first photoelectric coupler and the current control unit; the second end of the second photoelectric coupler is connected with the common end of the second photoelectric coupler and the current control unit; the third end is connected with the third end of the control unit;
the control unit acquires a voltage value of a discharge voltage provided by the single storage battery to be tested to the discharge loop through the sampling unit;
the first end of the temperature measuring circuit is connected with the negative electrode of the measured single storage battery, and the second end of the temperature measuring circuit is connected with the fourth end of the control unit;
and the control unit acquires the temperature value of the cathode of the measured single storage battery through the temperature measuring circuit.
The storage battery internal resistance and temperature measuring device provided by the embodiment of the invention comprises a plurality of single storage battery internal resistance and temperature measuring circuits, wherein the single storage battery internal resistance and temperature measuring circuits are mutually connected in parallel in the storage battery internal resistance and temperature measuring device, and the arrangement positions and the connection relations of the single storage battery internal resistance and temperature measuring circuits in the storage battery internal resistance and temperature measuring device can be set according to specific actual requirements and are not limited to parallel connection.
In this embodiment, the device for measuring internal resistance and temperature of a battery includes 12 single battery internal resistance and temperature measuring circuits, each of which includes a pair of photocouplers (e.g., optical couple 1-1 and optical couple 1-2 in fig. 5), a power resistor, a power tube, a current detecting circuit, a discharging switch, a temperature measuring circuit, an isolation driving circuit, and a controller.
In this embodiment, the internal resistance and temperature measuring device for the storage battery can simultaneously acquire internal resistance and negative temperature data of 12 single storage batteries, can also select any one or more of the 12 single storage batteries, acquires the internal resistance and negative temperature data, transmits the internal resistance and negative temperature data to the transceiver through the photoelectric coupling isolation circuit, and transmits the internal resistance and negative temperature data to the computer server through the transceiver.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
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 (5)
1. The utility model provides a monomer battery internal resistance and temperature measurement circuit which characterized in that includes: the device comprises a first photoelectric coupler, a second photoelectric coupler, a current control unit, a sampling unit, a temperature measuring circuit, a control unit and an isolation driving circuit;
the first end of the first photoelectric coupler is connected with the anode of the single storage battery to be detected, and the second end of the first photoelectric coupler is connected with the cathode of the single storage battery to be detected sequentially through the current control unit and the second photoelectric coupler to form a discharge loop; the first photoelectric coupler and the second photoelectric coupler respectively collect a positive electrode discharge pulse signal and a negative electrode discharge pulse signal of the tested storage battery, and couple the received positive electrode discharge pulse signal and the received negative electrode discharge pulse signal to an output port for output by taking light as a medium;
the first end of the control unit is connected with the first end of the current control unit through the isolation driving circuit and sends a PWM (pulse width modulation) signal to the current control unit, so that the current control unit controls the single storage battery to be tested to provide a discharge current corresponding to the PWM signal to the discharge loop;
the second end of the control unit is connected with the second end of the current control unit, and the current value of the discharge current is obtained through the current control unit;
the first end of the sampling unit is connected with the common end of the first photoelectric coupler and the current control unit; the second end of the second photoelectric coupler is connected with the common end of the second photoelectric coupler and the current control unit; the third end is connected with the third end of the control unit; the sampling unit receives the discharge pulse signals output by the first photoelectric coupler and the second photoelectric coupler;
the control unit acquires a voltage value of a discharge voltage provided by the single storage battery to be tested to the discharge loop through the sampling unit;
the first end of the temperature measuring circuit is connected with the negative electrode of the measured single storage battery, and the second end of the temperature measuring circuit is connected with the fourth end of the control unit;
and the control unit acquires the temperature value of the cathode of the measured single storage battery through the temperature measuring circuit.
2. The circuit of claim 1, wherein the current control unit comprises:
the power circuit comprises a power resistor, a power tube, a current detection circuit and a discharge switch;
the first end of the power resistor is connected with the second end of the first photoelectric coupler, and the second end of the power resistor is connected with the first end of the discharge switch through the power tube and the current detection circuit in sequence; the second end of the discharge switch is connected with the second photoelectric coupler, and the second end of the discharge switch is grounded;
the base electrode of the power tube is used as the first end of the current control unit and is connected with the first end of the control unit;
and the first end of the current detection circuit is used as the second end of the current control unit and is connected with the second end of the control unit.
3. The circuit of claim 1, wherein the sampling unit comprises: a sampling circuit and a follower;
the first end of the sampling circuit is the first end of the sampling unit; the second end is the second end of the sampling unit, and the third end is connected with the first end of the follower;
and the second end of the follower is the third end of the sampling unit.
4. The circuit of claim 1, further comprising: a communication unit;
the communication unit includes: a photoelectric coupling isolation circuit and a transceiver;
and the first end of the photoelectric coupling isolation circuit is connected with the fifth end of the control unit, and the second end of the photoelectric coupling isolation circuit is connected with the transceiver.
5. An internal resistance and temperature measuring device for a storage battery, comprising a plurality of internal resistance and temperature measuring circuits for single storage batteries according to claim 1, wherein each of the internal resistance and temperature measuring circuits is used for measuring the internal resistance and temperature of each single storage battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910313214.7A CN109901078B (en) | 2019-04-18 | 2019-04-18 | Internal resistance and temperature measuring circuit for single storage battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910313214.7A CN109901078B (en) | 2019-04-18 | 2019-04-18 | Internal resistance and temperature measuring circuit for single storage battery |
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| CN100348995C (en) * | 2005-08-25 | 2007-11-14 | 上海交通大学 | Passive isolation accumulator voltage monitoring circuit |
| CN101067648B (en) * | 2007-06-15 | 2010-04-14 | 华为技术有限公司 | Method and system for deciding electrolyte type storage battery performance |
| CN201583631U (en) * | 2009-07-17 | 2010-09-15 | 淄博智洋电气有限公司 | Online-detecting device and system of storage battery |
| CN103018671A (en) * | 2011-09-27 | 2013-04-03 | 王晓秋 | Intelligent storage battery monitoring and maintaining device |
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| CN105262156B (en) * | 2015-09-23 | 2018-08-14 | 山东金煜电子科技有限公司 | A kind of embedded self-protecting intelligent type lead-acid accumulator |
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| CN108802622A (en) * | 2018-05-24 | 2018-11-13 | 武汉工程大学 | A kind of accumulator monitoring activation apparatus and system |
| CN108565929A (en) * | 2018-05-25 | 2018-09-21 | 北京国电光宇新技术开发有限公司 | Accumulator charging/discharging system |
| CN109407013B (en) * | 2018-09-29 | 2020-12-18 | 广州小鹏汽车科技有限公司 | Standby battery electric quantity state monitoring circuit and method |
| CN208656478U (en) * | 2018-10-08 | 2019-03-26 | 秋玺能源科技（广州）有限公司 | A kind of slave observation circuit for lead-acid battery equalizaing charge |
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