CN112611974A - Storage battery internal resistance detection device - Google Patents
Storage battery internal resistance detection device Download PDFInfo
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- CN112611974A CN112611974A CN202011538987.4A CN202011538987A CN112611974A CN 112611974 A CN112611974 A CN 112611974A CN 202011538987 A CN202011538987 A CN 202011538987A CN 112611974 A CN112611974 A CN 112611974A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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Abstract
The invention provides a storage battery internal resistance detection device, which comprises: the load applying circuit is used for receiving the control signal and applying loads to the at least two storage batteries according to the control signal, wherein the at least two storage batteries are connected in series; each signal acquisition circuit is used for acquiring a response voltage signal of one path of storage battery after a load is applied; and the micro control unit is used for providing a control signal, detecting the load current after the load applying circuit applies the load to the at least two paths of storage batteries, and calculating the internal resistance of one path of storage battery corresponding to the signal acquisition circuit according to the load current and the response voltage signal acquired by each signal acquisition circuit. The invention can simultaneously detect the internal resistance of the storage batteries connected in series in multiple paths, the peak current of the load is constant, the current is small, the influence on the service life of the batteries is small, the acquisition is independent of the power supply line, and the influence of the impedance of the wire rod on the precision can be eliminated.
Description
Technical Field
The invention belongs to the technical field of battery internal resistance detection, and particularly relates to a storage battery internal resistance detection device.
Background
The internal resistance of the battery refers to the resistance of the battery when in work, the current flows through the battery, and is generally divided into alternating current internal resistance and direct current internal resistance, because the internal resistance of the rechargeable battery is very small, the polarization internal resistance is generated due to the polarization of the electrode capacity when the direct current internal resistance is measured, the true value can not be measured, and the influence of the polarization internal resistance can be avoided by measuring the alternating current internal resistance, so that the true internal value can be obtained.
The existing storage battery internal resistance detection device can only detect the internal resistance of one path of battery at one time, has low efficiency, needs to apply larger load current to the battery, has inconstant peak current, has larger influence on the service life of the battery, has more complicated field wiring, and is not beneficial to installation and later maintenance.
Disclosure of Invention
The invention aims to provide a storage battery internal resistance detection device, which solves the problems that the storage battery internal resistance detection device in the prior art is low in detection efficiency, influences the service life of a battery and is complex in wiring.
The embodiment of the invention provides a storage battery internal resistance detection device, which comprises:
the load applying circuit is used for receiving the control signal and applying loads to the at least two storage batteries according to the control signal, wherein the at least two storage batteries are connected in series;
each signal acquisition circuit is used for acquiring a response voltage signal of one path of storage battery after a load is applied;
and the micro control unit is used for providing a control signal, detecting the load current after the load applying circuit applies the load to the at least two paths of storage batteries, and calculating the internal resistance of one path of storage battery corresponding to the signal acquisition circuit according to the load current and the response voltage signal acquired by each signal acquisition circuit.
Optionally, each signal acquisition circuit is provided with a first port for connecting the positive electrode of one path of storage battery to be tested, a second port for connecting the negative electrode of the one path of storage battery to be tested, and an output port for outputting a response voltage signal after a load is applied to the one path of storage battery to be tested.
Optionally, the control signal comprises an SPWM wave.
Optionally, the load applying circuit includes a first operational amplifier, a second operational amplifier, an NMOS transistor, a first capacitor, a second capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, and an eighth resistor;
the non-inverting input end of the first operational amplifier receives a control signal through a first resistor, the non-inverting input end of the first operational amplifier is grounded through a first capacitor, the inverting input end of the first operational amplifier is connected with the output end of the first operational amplifier, the output end of the first operational amplifier is connected with the non-inverting input end of the second operational amplifier through a second resistor, the non-inverting input end of the second operational amplifier is grounded through a third resistor, the inverting input end of the second operational amplifier is grounded through an eighth resistor, the output end of the second operational amplifier is connected with the grid electrode of an NMOS (N-channel metal oxide semiconductor) tube through a fourth resistor, the grid electrode of the NMOS tube is grounded through a fifth resistor, the drain electrode of the NMOS tube receives a load signal through a sixth resistor and a seventh resistor which are connected in series, the drain electrode of the NMOS tube is grounded through a second capacitor, and the source electrode.
Optionally, the signal acquisition circuit includes a third operational amplifier, a fourth operational amplifier, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, and a sixteenth resistor;
the negative phase input end of a third operational amplifier is connected with the negative electrode of the tested storage battery through a third capacitor and a ninth resistor which are connected in series, the negative phase input end of the third operational amplifier is connected with the anode of a first diode, the cathode of the first diode is used for connecting a power supply, the negative phase input end of the third operational amplifier is connected with the cathode of a third diode, the anode of the third diode is grounded, the non-inverting input end of the third operational amplifier is connected with the anode of the tested storage battery through a fourth capacitor and a tenth resistor which are connected in series, the non-inverting input end of the third operational amplifier is connected with the anode of a second diode, the cathode of the second diode is used for connecting the power supply, the non-inverting input end of the third operational amplifier is connected with the cathode of a fourth diode, the anode of the fourth diode is grounded, and the non-inverting input end of the third operational amplifier, the non-inverting input end of the third operational amplifier is grounded through a seventh capacitor, the non-inverting input end of the third operational amplifier is also used for being connected with a bias power supply through a twelfth resistor, the output end of the third operational amplifier is connected with the inverting input end of the third operational amplifier through an eleventh resistor and a sixth capacitor which are connected in parallel, and the output end of the third operational amplifier is connected with the inverting input end of the fourth operational amplifier through a thirteenth resistor;
the non-inverting input end of the fourth operational amplifier is grounded through an eighth capacitor, the non-inverting input end of the fourth operational amplifier is also used for being connected with a bias power supply through a fourteenth resistor, the output end of the fourth operational amplifier is connected with the inverting input end of the fourth operational amplifier through a ninth capacitor and a fifteenth resistor which are connected in parallel, the output end of the fourth operational amplifier is connected with one end of a sixteenth resistor, the other end of the sixteenth resistor is connected with one end of a tenth capacitor, one end of an eleventh capacitor, the cathode of a fifth diode and the anode of the sixth diode, the other end of the tenth capacitor, the other end of the eleventh capacitor and the anode of the fifth diode are grounded, and the cathode of the sixth diode is used for being connected with the power supply.
Optionally, the device for detecting internal resistance of the storage battery further includes a reverse connection prevention diode, a cathode of the reverse connection prevention diode is connected to a load application end of the load application circuit, and an anode of the reverse connection prevention diode is used for connecting anodes of the first path of storage batteries of the at least two paths of storage batteries connected in series.
Optionally, the device for detecting internal resistance of a storage battery further includes a fuse, one end of the fuse is connected to a load applying end of the load applying circuit, and the other end of the fuse is used for connecting the positive electrodes of the first path of storage batteries of the at least two paths of storage batteries connected in series.
Optionally, the device for detecting internal resistance of a storage battery further includes a fuse, one end of which is connected to the load applying end of the load applying circuit, and the other end of which is used for connecting the positive electrode of the first storage battery of the at least two storage batteries connected in series.
Optionally, the method for detecting the load current after the load applying circuit applies the load to the at least two paths of storage batteries by the micro control unit includes:
and detecting the voltage between the source electrode of the NMOS tube and the eighth resistor, and calculating the load current according to the voltage and the resistance value of the eighth resistor.
Optionally, the manner that the micro control unit calculates the internal resistance of the storage battery corresponding to each signal acquisition circuit according to the load current and the response voltage signal acquired by each signal acquisition circuit includes:
and dividing the response voltage signal acquired by each signal acquisition circuit by the load current and then dividing the response voltage signal by the gain of the signal acquisition circuit to obtain the internal resistance of one path of storage battery corresponding to the signal acquisition circuit.
The device for detecting the internal resistance of the storage battery has the advantages that:
the embodiment of the invention provides a storage battery internal resistance detection device, which comprises: the load applying circuit is used for receiving the control signal and applying loads to the at least two storage batteries according to the control signal, wherein the at least two storage batteries are connected in series; each signal acquisition circuit is used for acquiring a response voltage signal of one path of storage battery after a load is applied; and the micro control unit is used for providing a control signal, detecting the load current after the load applying circuit applies the load to the at least two paths of storage batteries, and calculating the internal resistance of one path of storage battery corresponding to the signal acquisition circuit according to the load current and the response voltage signal acquired by each signal acquisition circuit. The invention can simultaneously detect the internal resistance of the storage batteries connected in series in a plurality of paths through a plurality of signal acquisition circuits, the peak current of the load applied through the load applying circuit is constant, the current is small, the influence on the service life of the battery is small, the acquisition is independent from the power supply line, and the influence of the wire impedance on the precision can be eliminated.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a storage battery internal resistance detection device according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a load applying circuit according to an embodiment of the present invention;
fig. 3 is a circuit schematic diagram of a signal acquisition circuit according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
The terms "comprises" and "comprising," as well as any other variations, in the description and claims of this invention and the drawings described above, are intended to mean "including but not limited to," and are intended to cover non-exclusive inclusions. For example, a process, method, or system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus. Furthermore, the terms "first," "second," and "third," etc. are used to distinguish between different objects and are not used to describe a particular order.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Fig. 1 is a schematic structural diagram of a storage battery internal resistance detection device according to an embodiment of the present invention, where the storage battery internal resistance detection device includes:
the load applying circuit 11 is used for receiving the control signal and applying load to at least two paths of storage batteries according to the control signal, wherein the at least two paths of storage batteries are connected in series;
at least two signal acquisition circuits 12, each signal acquisition circuit is used for acquiring a response voltage signal of one path of storage battery after a load is applied;
and the micro control unit 13 is used for providing a control signal, detecting the load current after the load applying circuit applies the load to the at least two paths of storage batteries, and calculating the internal resistance of one path of storage battery corresponding to the signal acquisition circuit according to the load current and the response voltage signal acquired by each signal acquisition circuit.
In the present embodiment, a load current varying in a sine wave of 5Hz is applied to the battery pack by a load application circuit. And in at least two storage batteries connected in series, the highest battery and the lowest battery are used as power supply ends.
Optionally, the number of the signal acquisition circuits is 4, and each signal acquisition circuit is provided with a first port for connecting the positive electrode of one path of storage battery to be tested, a second port for connecting the negative electrode of the other path of storage battery to be tested, and an output port for outputting a response voltage signal after a load is applied to the other path of storage battery to be tested.
Optionally, the control signal comprises an SPWM wave.
Wherein, SPWM wave is produced by MCU, and sampling frequency is 9KHz, and the duty cycle is according to 5Hz sinusoidal variation.
Fig. 2 is a circuit schematic diagram of a load applying circuit according to an embodiment of the present invention, where the load applying circuit includes a first operational amplifier F1, a second operational amplifier F2, an NMOS transistor Q1, a first capacitor C1, a second capacitor C2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8;
the non-inverting input end of the first operational amplifier F1 receives a control signal through a first resistor R1, the non-inverting input end of the first operational amplifier F1 is grounded through a first capacitor, the inverting input end of the first operational amplifier is connected with the output end of the first operational amplifier, the output end of the first operational amplifier is connected with the non-inverting input end of the second operational amplifier through a second resistor, the non-inverting input end of the second operational amplifier is grounded through a third resistor, the inverting input end of the second operational amplifier is grounded through an eighth resistor, the output end of the second operational amplifier is connected with the grid electrode of an NMOS tube through a fourth resistor, the grid electrode of the NMOS tube is grounded through a fifth resistor, the drain electrode of the NMOS tube receives a load signal through a sixth resistor and a seventh resistor which are connected in series, the drain electrode of the NMOS tube is grounded through a second capacitor, and the source electrode of the NMOS tube is connected with the.
In this embodiment, the load current and the SPWM wave are subjected to low-pass filtering, voltage following and voltage division by R3 and C4 in fig. 2, and then a sine wave of 5Hz is output, and then the sine wave is used as an adjusting tube by the operational amplifier LM258 to drive the NMOS transistor Q1, which is used for on-off control of the load. Q1 works in the amplification region, R1 and R2 are used for voltage division, the voltage drop of the drain source of Q1 is reduced, and the applied load current can be calculated by collecting the voltage of VNMOS _ OUT and the known sampling resistor R8.
Fig. 3 is a schematic circuit diagram of a signal acquisition circuit according to an embodiment of the present invention, where the signal acquisition circuit includes a third operational amplifier, a fourth operational amplifier, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, and a sixteenth resistor;
the negative phase input end of a third operational amplifier is connected with the negative electrode of the tested storage battery through a third capacitor and a ninth resistor which are connected in series, the negative phase input end of the third operational amplifier is connected with the anode of a first diode, the cathode of the first diode is used for connecting a power supply, the negative phase input end of the third operational amplifier is connected with the cathode of a third diode, the anode of the third diode is grounded, the non-inverting input end of the third operational amplifier is connected with the anode of the tested storage battery through a fourth capacitor and a tenth resistor which are connected in series, the non-inverting input end of the third operational amplifier is connected with the anode of a second diode, the cathode of the second diode is used for connecting the power supply, the non-inverting input end of the third operational amplifier is connected with the cathode of a fourth diode, the anode of the fourth diode is grounded, and the non-inverting input end of the third operational amplifier, the non-inverting input end of the third operational amplifier is grounded through a seventh capacitor, the non-inverting input end of the third operational amplifier is also used for being connected with a bias power supply through a twelfth resistor, the output end of the third operational amplifier is connected with the inverting input end of the third operational amplifier through an eleventh resistor and a sixth capacitor which are connected in parallel, and the output end of the third operational amplifier is connected with the inverting input end of the fourth operational amplifier through a thirteenth resistor;
the non-inverting input end of the fourth operational amplifier is grounded through an eighth capacitor, the non-inverting input end of the fourth operational amplifier is also used for being connected with a bias power supply through a fourteenth resistor, the output end of the fourth operational amplifier is connected with the inverting input end of the fourth operational amplifier through a ninth capacitor and a fifteenth resistor which are connected in parallel, the output end of the fourth operational amplifier is connected with one end of a sixteenth resistor, the other end of the sixteenth resistor is connected with one end of a tenth capacitor, one end of an eleventh capacitor, the cathode of a fifth diode and the anode of the sixth diode, the other end of the tenth capacitor, the other end of the eleventh capacitor and the anode of the fifth diode are grounded, and the cathode of the sixth diode is used for being connected with the power supply.
Optionally, the device for detecting internal resistance of the storage battery further includes a reverse connection prevention diode, a cathode of the reverse connection prevention diode is connected to a load application end of the load application circuit, and an anode of the reverse connection prevention diode is used for connecting anodes of the first path of storage batteries of the at least two paths of storage batteries connected in series.
Optionally, the device for detecting internal resistance of a storage battery further includes a fuse, one end of the fuse is connected to a load applying end of the load applying circuit, and the other end of the fuse is used for connecting the positive electrodes of the first path of storage batteries of the at least two paths of storage batteries connected in series.
Optionally, the device for detecting internal resistance of a storage battery further includes a fuse, one end of which is connected to the load applying end of the load applying circuit, and the other end of which is used for connecting the positive electrode of the first storage battery of the at least two storage batteries connected in series.
Optionally, the method for detecting the load current after the load applying circuit applies the load to the at least two paths of storage batteries by the micro control unit includes:
and detecting the voltage between the source electrode of the NMOS tube and the eighth resistor, and calculating the load current according to the voltage and the resistance value of the eighth resistor.
Optionally, the manner that the micro control unit calculates the internal resistance of the storage battery corresponding to each signal acquisition circuit according to the load current and the response voltage signal acquired by each signal acquisition circuit includes:
and dividing the response voltage signal acquired by each signal acquisition circuit by the load current and then dividing the response voltage signal by the gain of the signal acquisition circuit to obtain the internal resistance of one path of storage battery corresponding to the signal acquisition circuit.
As can be seen from the above embodiments, the embodiments of the present invention include: the load applying circuit is used for receiving the control signal and applying loads to the at least two storage batteries according to the control signal, wherein the at least two storage batteries are connected in series; each signal acquisition circuit is used for acquiring a response voltage signal of one path of storage battery after a load is applied; and the micro control unit is used for providing a control signal, detecting the load current after the load applying circuit applies the load to the at least two paths of storage batteries, and calculating the internal resistance of one path of storage battery corresponding to the signal acquisition circuit according to the load current and the response voltage signal acquired by each signal acquisition circuit. The invention can simultaneously detect the internal resistance of the storage batteries connected in series in a plurality of paths through a plurality of signal acquisition circuits, the peak current of the load applied through the load applying circuit is constant, the current is small, the influence on the service life of the battery is small, the acquisition is independent from the power supply line, and the influence of the wire impedance on the precision can be eliminated.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. The storage battery internal resistance detection device is characterized by comprising:
the load applying circuit is used for receiving a control signal and applying loads to at least two paths of storage batteries according to the control signal, wherein the at least two paths of storage batteries are connected in series;
each signal acquisition circuit is used for acquiring a response voltage signal of one path of storage battery after a load is applied;
and the micro control unit is used for providing the control signal, detecting the load current after the load applying circuit applies the load to at least two paths of storage batteries, and calculating the internal resistance of one path of storage battery corresponding to the signal acquisition circuit according to the load current and the response voltage signal acquired by each signal acquisition circuit.
2. The storage battery internal resistance detection device according to claim 1, wherein each signal acquisition circuit is provided with a first port for connecting the positive electrode of one path of storage battery to be detected, a second port for connecting the negative electrode of the one path of storage battery to be detected, and an output port for outputting a response voltage signal after a load is applied to the one path of storage battery to be detected.
3. The battery internal resistance detection device according to claim 2, characterized in that the control signal includes an SPWM wave.
4. The battery internal resistance detection device according to any one of claims 1 to 3, wherein the load application circuit includes a first operational amplifier, a second operational amplifier, an NMOS transistor, a first capacitor, a second capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, and an eighth resistor;
the non-inverting input terminal of the first operational amplifier receives the control signal through the first resistor, the non-inverting input terminal of the first operational amplifier is grounded through a first capacitor, the inverting input terminal of the first operational amplifier is connected with the output terminal of the first operational amplifier, the output terminal of the first operational amplifier is connected with the non-inverting input terminal of the second operational amplifier through the second resistor, the non-inverting input terminal of the second operational amplifier is grounded through the third resistor, the inverting input terminal of the second operational amplifier is grounded through the eighth resistor, the output terminal of the second operational amplifier is connected with the gate of the NMOS transistor through the fourth resistor, the gate of the NMOS transistor is grounded through the fifth resistor, and the drain of the NMOS transistor receives a load signal through the sixth resistor and the seventh resistor which are connected in series, the drain electrode of the NMOS tube is grounded through the second capacitor, and the source electrode of the NMOS tube is connected with the inverting input end of the second operational amplifier.
5. The storage battery internal resistance detection device according to any one of claims 1 to 3, wherein the signal acquisition circuit comprises a third operational amplifier, a fourth operational amplifier, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor and a sixteenth resistor;
the negative pole of the tested battery is connected with the inverting input end of the third operational amplifier through the third capacitor and the ninth resistor which are connected in series, the anode of the first diode is connected with the inverting input end of the third operational amplifier, the cathode of the first diode is used for connecting a power supply, the cathode of the third diode is connected with the inverting input end of the third operational amplifier, the anode of the third diode is grounded, the positive pole of the tested battery is connected with the non-inverting input end of the third operational amplifier through the fourth capacitor and the tenth resistor which are connected in series, the anode of the second diode is connected with the non-inverting input end of the third operational amplifier, the cathode of the second diode is used for connecting the power supply, the cathode of the fourth diode is connected with the non-inverting input end of the third operational amplifier, and the anode of the fourth diode is grounded, the non-inverting input end of the third operational amplifier is connected with the inverting input end of the third operational amplifier through the fifth capacitor, the non-inverting input end of the third operational amplifier is grounded through the seventh capacitor, the non-inverting input end of the third operational amplifier is also used for being connected with a bias power supply through the twelfth resistor, the output end of the third operational amplifier is connected with the inverting input end of the third operational amplifier through the eleventh resistor and the sixth capacitor which are connected in parallel, and the output end of the third operational amplifier is connected with the inverting input end of the fourth operational amplifier through the thirteenth resistor;
the non-inverting input end of the fourth operational amplifier is grounded through the eighth capacitor, the non-inverting input end of the fourth operational amplifier is further used for being connected with a bias power supply through the fourteenth resistor, the output end of the fourth operational amplifier is connected with the inverting input end of the fourth operational amplifier through the ninth capacitor and the fifteenth resistor which are connected in parallel, the output end of the fourth operational amplifier is connected with one end of the sixteenth resistor, the other end of the sixteenth resistor is connected with one end of the tenth capacitor, one end of the eleventh capacitor, the cathode of the fifth diode and the anode of the sixth diode, the other end of the tenth capacitor, the other end of the eleventh capacitor and the anode of the fifth diode are grounded, and the cathode of the sixth diode is used for being connected with the power supply.
6. The storage battery internal resistance detection device according to any one of claims 1 to 3, further comprising a reverse connection prevention diode, wherein a cathode of the reverse connection prevention diode is connected with a load application end of the load application circuit, and an anode of the reverse connection prevention diode is used for connecting an anode of a first storage battery of the at least two storage batteries connected in series.
7. The battery internal resistance detection device according to any one of claims 1 to 3, further comprising a fuse, one end of which is connected to a load application end of the load application circuit, and the other end of which is used to connect the positive electrode of a first battery of the at least two batteries connected in series.
8. The battery internal resistance detection device according to any one of claims 1 to 3, further comprising a fuse, one end of which is connected to the load application end of the load application circuit, and the other end of which is used for connecting the positive electrode of the first battery of the at least two batteries connected in series.
9. The storage battery internal resistance detection device according to any one of claims 1 to 3, wherein the manner of detecting the load current after the load application circuit applies the load to the at least two storage batteries by the micro control unit comprises:
and detecting the voltage between the source electrode of the NMOS tube and the eighth resistor, and calculating the load current according to the voltage and the resistance value of the eighth resistor.
10. The storage battery internal resistance detection device according to any one of claims 1 to 3, wherein the manner of calculating the internal resistance of one path of storage battery corresponding to each signal acquisition circuit by the micro control unit according to the load current and the response voltage signal acquired by each signal acquisition circuit comprises:
and dividing the response voltage signal acquired by each signal acquisition circuit by the load current and then dividing the response voltage signal by the gain of the signal acquisition circuit to obtain the internal resistance of one path of storage battery corresponding to the signal acquisition circuit.
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Application publication date: 20210406 |