CN114035092B - Battery internal resistance detection device, direct current-to-direct current converter and vehicle - Google Patents
Battery internal resistance detection device, direct current-to-direct current converter and vehicle Download PDFInfo
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- CN114035092B CN114035092B CN202111136957.5A CN202111136957A CN114035092B CN 114035092 B CN114035092 B CN 114035092B CN 202111136957 A CN202111136957 A CN 202111136957A CN 114035092 B CN114035092 B CN 114035092B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/30—The power source being a fuel cell
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Measurement Of Current Or Voltage (AREA)
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Abstract
The application provides a battery internal resistance detection device, a direct current-to-direct current converter and a vehicle, wherein in the battery internal resistance detection device, an alternating current superposition module is used for superposing an alternating current component in an input electric signal of a voltage conversion module, and the input electric signal is an electric signal output to the voltage conversion module by a first battery module; the current sampling module is used for performing current sampling on the superimposed signal of the input electric signal and the alternating current component, filtering the current direct current component in the acquired current to obtain a target current sampling value and sending the target current sampling value to the control module; the voltage sampling module is used for performing voltage sampling on the superimposed signal, filtering out a voltage direct current component in the acquired voltage to obtain a target voltage sampling value and sending the target voltage sampling value to the control module; the control module is used for determining the internal resistance of the first battery module according to the target current sampling value and the target voltage sampling value. The battery internal resistance detection device, the direct current-to-direct current converter and the vehicle are beneficial to reducing the current sampling cost of battery internal resistance detection.
Description
Technical Field
The application relates to the technical field of electronics, in particular to a battery internal resistance detection device, a direct current-to-direct current converter and a vehicle.
Background
With the rapid development of hydrogen fuel cells, hydrogen fuel cell automobiles are increasingly used. The hydrogen fuel cell is used for catalyzing hydrogen and oxygen to react under the condition of no combustion through the vehicle-mounted proton exchange membrane electric pile to generate electric power, so that the cruising ability of the electric automobile is effectively improved, and the cruising mileage of hundreds of kilometers can be achieved under the comprehensive working condition through short-time hydrogen filling. The product of the oxyhydrogen reaction is only water, so that the utilization efficiency of energy sources is effectively improved while the atmospheric pollution is reduced. However, the service life of the hydrogen fuel cell reactor has been a problem in the industry, and in order to improve the service life of the reactor, it is necessary to measure the internal resistance of the fuel cell reactor to reflect the performance index thereof and adjust the internal resistance in real time to improve the service life of the reactor.
Since the fuel cell is practically equivalent to an active resistor, it is common to apply a current with a fixed frequency to the fuel cell, sample the voltage and current, and finally calculate the internal resistance value of the fuel cell when the internal resistance of the fuel cell is detected. Since the current internal resistance detection method of the fuel cell is to sample the total output current of the fuel cell, a hall sensor is required to be specially added to sample the output current of the fuel cell, so that the current sampling cost is high.
Disclosure of Invention
The application provides a battery internal resistance detection device, a direct current-to-direct current converter and a vehicle, so as to reduce the current sampling cost of battery internal resistance detection.
In a first aspect, an embodiment of the present application provides a battery internal resistance detection apparatus, including: the system comprises an alternating current superposition module, a current sampling module, a voltage sampling module and a control module, wherein a first output end of the first battery module is connected with a first end of the alternating current superposition module, a second end of the alternating current superposition module is connected with a first input end of the voltage conversion module, a second input end of the voltage conversion module is connected with a second output end of the first battery module, a first voltage sampling port of the voltage sampling module is arranged between the first output end of the first battery module and the first end of the alternating current superposition module, a second voltage sampling port of the voltage sampling module is arranged between a second output end of the first battery module and a second input end of the voltage conversion circuit, a current sampling port of the current sampling module is arranged between the second end of the alternating current superposition module and the first input end of the voltage conversion module, and the control module is respectively connected with the current sampling module and the voltage sampling module;
The alternating current superposition module is used for superposing alternating current components in an input electric signal of the voltage conversion module, wherein the input electric signal is an electric signal output to the voltage conversion module by the first battery module;
the current sampling module is used for performing current sampling on the superposition signal of the input electric signal and the alternating current component, filtering out the current direct current component in the acquired current to obtain a target current sampling value, and sending the target current sampling value to the control module;
the voltage sampling module is used for performing voltage sampling on the superimposed signal, filtering out a voltage direct current component in the acquired voltage to obtain a target voltage sampling value, and sending the target voltage sampling value to the control module;
the control module is used for determining the internal resistance of the first battery module according to the target current sampling value and the target voltage sampling value.
In one embodiment, the voltage conversion module comprises N parallel voltage conversion circuits, and the current sampling module comprises N current acquisition circuits, an isolation circuit, a first filter circuit, a first differential amplification circuit and a first output port; the alternating current superposition modules comprise N, N is a positive integer, wherein the N alternating current superposition modules comprise first alternating current superposition modules, the N current acquisition circuits comprise first current acquisition circuits, and the N voltage conversion circuits comprise first voltage conversion circuits; the first ends of the N alternating current superposition modules are connected with the first output end of the first battery module after being combined, the second ends of the first alternating current superposition modules are connected with the first input end of the first voltage conversion circuit, the current sampling port of the first current acquisition circuit is arranged between the second ends of the first alternating current superposition modules and the first input end of the first voltage conversion circuit, the second input ends of the N voltage conversion circuits are connected with the second output end of the first battery module after being combined, the output ends of the N current acquisition circuits are connected with the first end of the isolation circuit after being combined, the first ends of the first filter circuit are respectively connected with the second ends of the isolation circuit and the first input end of the first differential amplification circuit, the second ends of the first filter circuit are connected with the second input end of the first differential amplification circuit, and the output ends of the first differential amplification circuit are connected with the first output port.
In one embodiment, when N is an integer greater than 1, the current sampling module further comprises: the input end of the first adder circuit is connected with the second end of the isolation circuit, the output end of the first adder circuit is respectively connected with the first end of the first filter circuit and the first input end of the first differential amplifying circuit, and the first adder circuit is used for carrying out superposition processing on currents acquired by the N current acquisition circuits.
In one embodiment, the first ac-superposition module includes: the first port, the alternating current injection circuit, the first amplifier, the second amplifier, the first resistor, the second resistor, the third resistor, the fourth resistor and the fifth resistor; the first end of the first port is used as the first end of the first alternating current superposition module, the second end of the first port, the output end of the alternating current injection circuit and the first end of the first resistor are connected with the inverting input end of the first amplifier after being combined, the non-inverting input end of the first amplifier is connected with the second resistor in series and then grounded, the output end of the first amplifier, the second end of the first resistor are connected with the first end of the third resistor after being combined, the inverting input end of the second amplifier and the first end of the fourth resistor are connected with the second end of the third resistor after being combined, the non-inverting input end of the second amplifier is connected with the fifth resistor in series and then grounded, and the output end of the second amplifier and the second end of the fourth resistor are connected with the first input end of the first voltage conversion circuit after being combined.
In one embodiment, the first current acquisition circuit includes: a sixth resistor, a seventh resistor and a first capacitor; the current sampling port of the first current acquisition circuit is respectively connected with the second end of the first alternating current superposition module, the first input end of the first voltage conversion circuit and the first end of the sixth resistor, the first end of the seventh resistor, the first end of the first capacitor and the first end of the isolation circuit are connected with the second end of the sixth resistor after being combined, and the second end of the seventh resistor and the second end of the first capacitor are grounded after being combined.
In one embodiment, the first filter circuit includes: an eighth resistor, a second capacitor and a third capacitor; the first end of the second capacitor and the first end of the eighth resistor are combined to serve as the first end of the first filter circuit, the second end of the second capacitor is grounded, the second end of the eighth resistor and the first end of the third capacitor are combined to serve as the second end of the first filter circuit, and the second end of the third capacitor is grounded.
In one embodiment, the first differential amplifying circuit includes: the first power supply module comprises a first voltage follower, a second voltage follower, a third amplifier, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor and a first power supply module; the input end of the first voltage follower is used as a first input end of the first differential amplifying circuit, the input end of the second voltage follower is used as a second input end of the first differential amplifying circuit, the output end of the first voltage follower is connected with the first end of the ninth resistor, the second end of the ninth resistor, the first end of the tenth resistor and the first end of the fourth capacitor are connected with the positive input end of the third amplifier after being combined, the second end of the tenth resistor and the second end of the fourth capacitor are connected with the positive electrode of the first power supply module after being combined, and the negative electrode of the first power supply module is grounded; the output end of the second voltage follower is connected with the first end of the eleventh resistor, the second end of the eleventh resistor, the first end of the twelfth resistor and the first end of the fifth capacitor are connected with the inverting input end of the third amplifier after being combined, the second end of the twelfth resistor, the second end of the fifth capacitor and the output end of the third amplifier are connected with the first end of the thirteenth resistor after being combined, the second end of the thirteenth resistor is connected with the first end of the sixth capacitor, and the second end of the sixth capacitor is grounded.
In one embodiment, the voltage sampling module includes: the first voltage sampling port, the second filter circuit, the second differential amplifying circuit and the second output port; the first ends of the N alternating current superposition modules are connected with the first voltage sampling port after being combined, the first voltage sampling port is also connected with the first output end of the first battery module and the first input end of the second filter circuit, the second voltage sampling port is respectively connected with the second output end of the first battery module, the second input end of the voltage conversion module and the second input end of the second filter circuit, the first output end of the second filter circuit is connected with the first input end of the second differential amplification circuit, the second output end of the second filter circuit is connected with the second input end of the second differential amplification circuit, and the second output port is respectively connected with the output end of the second differential amplification circuit and the control module; the first voltage sampling port and the second voltage sampling port are used for voltage sampling of the superimposed signal, the second filter circuit is used for filtering voltage direct current components in the collected voltage, the second differential amplifying circuit is used for amplifying the voltage sampling value after the voltage direct current components are filtered to obtain the target voltage sampling value, and the target voltage sampling value is sent to the control module through the second output port.
In one embodiment, the second filter circuit includes: a seventh capacitor, a fourteenth resistor; the first end of the seventh capacitor C07 is used as the first input end of the second filter circuit, the second end of the seventh capacitor and the first end of the fourteenth resistor are connected to the first output end of the second filter circuit after being combined, and the second end of the fourteenth resistor is connected to the second input end and the second output end of the second filter circuit respectively.
In one embodiment, the second differential amplifying circuit includes: a fourth amplifier, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighth capacitor, a ninth capacitor, a tenth capacitor and a second power supply module; the positive phase input end of the fourth amplifier, the first end of the fifteenth resistor and the first end of the eighth capacitor are combined to serve as the first input end of the second differential amplifying circuit, the second end of the fifteenth resistor and the second end of the eighth capacitor are combined to be connected with the positive electrode of the second power supply module, and the negative electrode of the second power supply module is grounded; the reverse input end of the fourth amplifier, the first end of the sixteenth resistor and the first end of the ninth capacitor are combined and then used as the second input end of the second differential amplifying circuit, the second end of the sixteenth resistor, the second end of the ninth capacitor and the output end of the fourth amplifier are combined and then connected with the first end of the seventeenth resistor, the second end of the seventeenth resistor is connected with the first end of the tenth capacitor, the second end of the tenth capacitor is grounded, and the second end of the seventeenth resistor is used as the output end of the second differential amplifying circuit.
In one embodiment, the voltage sampling module further comprises: an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a first zener diode, a second zener diode, and a third voltage follower; the first end of the eighteenth resistor is connected with the first output end of the second filter circuit, the negative electrode of the first zener diode and the second end of the eighteenth resistor are connected with the input end of the third voltage follower after being combined, the output end of the third voltage follower is connected with the first end of the nineteenth resistor, the second end of the nineteenth resistor is connected with the first input end of the second differential amplifying circuit, the positive electrode of the first zener diode is connected with the positive electrode of the second zener diode, the negative electrode of the second zener diode and the second output end of the second filter circuit are connected with the first end of the twentieth resistor after being combined, and the second end of the twentieth resistor is connected with the second input end of the second differential amplifying circuit.
In a second aspect, the present application provides a dc-dc converter, including the battery internal resistance detection device and the voltage conversion module according to the first aspect.
In a third aspect, the present application provides a vehicle comprising the battery internal resistance detection device as described in the first aspect or the dc-dc converter as described in the second aspect.
It can be seen that, the battery internal resistance detection device, the direct current-to-direct current converter and the vehicle provided by the application, through overlapping alternating current components in the input electric signal output to the voltage conversion module to the first battery module, and carrying out current-voltage sampling on the input electric signal of the voltage conversion module and the overlapping signal of the alternating current components, so as to finally calculate the internal resistance of the first battery module.
Drawings
Fig. 1 is a schematic circuit diagram of a battery internal resistance detection device provided in the present application;
fig. 2A is a schematic circuit diagram of another internal resistance detection device of a battery provided in the present application;
fig. 2B is a schematic circuit diagram of another internal resistance detection device of a battery provided in the present application;
FIG. 3A is a schematic diagram of a circuit configuration of an isolation circuit provided herein;
FIG. 3B is a schematic diagram of another isolation circuit provided herein;
FIG. 3C is a schematic circuit diagram of another isolation circuit provided herein;
FIG. 4A is a schematic diagram of a portion of a circuit configuration of a current sampling module provided herein;
FIG. 4B is a schematic circuit diagram of a first adder provided herein;
fig. 5A is a schematic circuit diagram of a first ac stacking module provided in the present application;
fig. 5B is a schematic circuit diagram of another first ac superposition module provided in the present application;
FIG. 6 is a schematic circuit diagram of a first current collection circuit provided herein;
fig. 7 is a schematic circuit diagram of a first filter circuit provided in the present application;
fig. 8 is a schematic circuit diagram of a first differential amplifying circuit provided in the present application;
fig. 9A is a schematic diagram of a part of a circuit structure of a battery internal resistance detection device provided in the present application;
fig. 9B is a schematic diagram of a part of a circuit structure of another internal resistance detection device for a battery provided in the present application;
fig. 10 is a schematic circuit diagram of a second filter circuit provided in the present application;
fig. 11 is a schematic circuit diagram of a second differential amplifying circuit provided in the present application;
fig. 12 is a schematic circuit diagram of a first filter circuit provided in the present application;
FIG. 13A is a schematic diagram of a simulation circuit of a current sampling module provided herein;
fig. 13B is a schematic diagram of a simulation circuit of a voltage sampling module provided in the present application.
The present application is further described below with reference to the accompanying drawings and examples.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description of the present application and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
Example 1:
referring to fig. 1, the present embodiment provides a battery internal resistance detection apparatus including: the system comprises an alternating current superposition module, a current sampling module, a voltage sampling module and a control module, wherein a first output end of the first battery module is connected with a first end of the alternating current superposition module, a second end of the alternating current superposition module is connected with a first input end of the voltage conversion module, a second input end of the voltage conversion module is connected with a second output end of the first battery module, a first voltage sampling port of the voltage sampling module is arranged between the first output end of the first battery module and the first end of the alternating current superposition module, a second voltage sampling port of the voltage sampling module is arranged between a second output end of the first battery module and a second input end of the voltage conversion circuit, a current sampling port of the current sampling module is arranged between the second end of the alternating current superposition module and the first input end of the voltage conversion module, and the control module is respectively connected with the current sampling module and the voltage sampling module;
the alternating current superposition module is used for superposing alternating current components in an input electric signal of the voltage conversion module, wherein the input electric signal is an electric signal output to the voltage conversion module by the first battery module;
The current sampling module is used for performing current sampling on the superposition signal of the input electric signal and the alternating current component, filtering out the current direct current component in the acquired current to obtain a target current sampling value, and sending the target current sampling value to the control module;
the voltage sampling module is used for performing voltage sampling on the superimposed signal, filtering out a voltage direct current component in the acquired voltage to obtain a target voltage sampling value, and sending the target voltage sampling value to the control module;
the control module is used for determining the internal resistance of the first battery module according to the target current sampling value and the target voltage sampling value.
The voltage conversion module may include, for example, a BOOST circuit in the dc-dc converter DCDC. The first cell module may be a stack of hydrogen fuel cells.
The current sampling module can comprise a Hall sensor which is originally arranged in the DCDC and used for sampling input current, and the current sampling module samples the current of the superimposed signal through the Hall sensor, namely, the current sampling port can be the Hall sensor.
Referring to fig. 2A, in one possible example, the voltage conversion module includes N parallel voltage conversion circuits, and the current sampling module includes N current acquisition circuits, an isolation circuit, a first filter circuit, a first differential amplification circuit, and a first output port; the alternating current superposition modules comprise N, N is a positive integer, wherein the N alternating current superposition modules comprise first alternating current superposition modules, the N current acquisition circuits comprise first current acquisition circuits, and the N voltage conversion circuits comprise first voltage conversion circuits;
The first ends of the N alternating current superposition modules are connected with the first output end of the first battery module after being combined, the second ends of the first alternating current superposition modules are connected with the first input end of the first voltage conversion circuit, a current sampling port of the first current acquisition circuit is arranged between the second ends of the first alternating current superposition modules and the first input end of the first voltage conversion circuit, the second input ends of the N voltage conversion circuits are connected with the second output end of the first battery module after being combined, the output ends of the N current acquisition circuits are connected with the first end of the isolation circuit after being combined, the first ends of the first filter circuit are respectively connected with the second ends of the isolation circuit and the first input end of the first differential amplification circuit, and the second ends of the first filter circuit are connected with the second input end of the first differential amplification circuit.
As shown in fig. 2A, the N ac superposition modules, the N current collecting circuits, and the N voltage converting circuits may be connected in a one-to-one correspondence. That is, the ac superposition modules connected to the different current collecting circuits are different, the voltage conversion circuits connected to the different current collecting circuits are also different, and the different current collecting circuits are not connected to the same ac superposition module or the same voltage conversion circuit. In fig. 2A, the corresponding connection relationship among the ac superposition module, the current collection circuit, and the voltage conversion circuit is described with N being greater than 1, and specifically, the first ac superposition module, the first current collection circuit, and the first voltage conversion circuit are correspondingly connected, and the nth ac superposition module, the nth current collection circuit, and the nth voltage conversion circuit are correspondingly connected.
When N is greater than 1, the ac component may include N sub-ac components, the input electrical signal may include N sub-input electrical signals, the superimposed signal may correspondingly include N sub-superimposed signals, each ac superimposing module is configured to superimpose the sub-ac components on the sub-input electrical signal of the corresponding voltage converting circuit to obtain a sub-superimposed signal, and each current collecting circuit corresponding to the voltage converting circuit is configured to sample the current of the sub-superimposed signal corresponding to the voltage converting circuit. The isolation circuit is used for isolating the current acquisition circuit and the filter circuit, and the first filter circuit and the first differential amplification circuit are used for filtering and amplifying direct current components in the current acquired by the current acquisition circuit.
Further, when N is greater than 1, the peak values of the sub ac components superimposed in the voltage conversion circuits to which each ac superimposition module corresponds are the same, and the frequency of each sub ac component is fixed.
The voltage conversion circuit may be a BOOST circuit.
The first voltage conversion circuit may be any one of the N voltage conversion circuits. That is, the first end of each of the N voltage conversion circuits is connected to the current sampling port of the current sampling module corresponding to the voltage conversion circuit, and the current sampling port is also connected to the second end of the ac superposition module corresponding to the voltage conversion circuit.
It should be noted that, in fig. 2A, only two current collecting circuits, two ac superposition modules and two voltage conversion circuits are shown by way of example, in practical application, the number of the current collecting circuits, the ac superposition modules and the voltage conversion circuits may be more or less, for example, N may be a value of 8 or 1, etc., which is not limited herein specifically. Specifically, when N is 8, the circuit topology of the voltage conversion module may be an 8-phase staggered BOOST, and when N is 1, the schematic circuit structure diagram of the internal resistance detection device of the battery may specifically refer to fig. 2B, where in fig. 2B, the first ac superposition module, the first current acquisition circuit, and the first voltage conversion circuit are taken as examples, and the connection relationship between each circuit in the internal resistance detection device of the battery and the voltage conversion module is shown when N is 1 (i.e., the inside of the voltage conversion module is a single-phase circuit).
In a specific implementation, the battery internal resistance detection device and the voltage conversion module may be devices arranged inside the direct current-direct current converter DCDC, where the current acquisition ports A1 and An may be hall sensors.
Further, referring to fig. 3A and 3B, the isolation circuit includes N parallel isolation sub-circuits, where a first end of each isolation sub-circuit is combined to form a first end of the isolation circuit, and a second end of each isolation sub-circuit is combined to form a second end of the isolation circuit; the isolation circuit is used for isolating the current acquisition circuit and the first filter circuit and avoiding the influence of the circuits.
Specifically, referring to fig. 3C, each isolation subcircuit may include a voltage follower and a resistor in series. In fig. 3C, the voltage follower a04 and the resistor R21 are connected in series to form an isolation sub-circuit, the voltage follower a05 and the resistor R22 are connected in series to form another isolation sub-circuit, and the first end of the resistor (the second end of the resistor is connected to the output end of the voltage follower) and the first end of a capacitor (C11 in fig. 3C) in each sub-isolation circuit are combined to form the second end of the isolation circuit, and the second end of the capacitor is grounded.
Referring to fig. 4A, in one possible example, when N is an integer greater than 1, the current sampling module further includes: the input end of the first adder circuit is connected with the second end of the isolation circuit, the output end of the first adder circuit is respectively connected with the first end of the first filter circuit and the first input end of the first differential amplifying circuit, and the first adder circuit is used for carrying out superposition processing on currents acquired by the N current acquisition circuits.
Specifically, referring to fig. 4B, the first adder circuit may include: a fifth amplifier U05, a sixth amplifier U06, a twenty-first resistor R23, a twenty-second resistor R24, a twenty-third resistor R25, a twenty-fourth resistor R26, and a twenty-fifth resistor R27; the second end of the isolation circuit is connected with the first end of the twenty-first resistor R23 after being combined, the inverting input end of the fifth amplifier U05 is connected with the twenty-second resistor R24 in series and then grounded, the output end of the fifth amplifier U05, the second end of the twenty-first resistor R23 is connected with the first end of the twenty-third resistor R25 after being combined, the inverting input end of the sixth amplifier U06 and the first end of the twenty-fourth resistor R26 are connected with the second end of the twenty-third resistor R25 after being combined, the non-inverting input end of the sixth amplifier U06 is connected with the twenty-fifth resistor R27 in series and then grounded, and the output end of the second amplifier U02 and the second end of the twenty-fourth resistor R26 are respectively connected with the first end of the first filter circuit and the second input end of the first differential amplifying circuit after being combined.
Referring to fig. 5A, in one possible example, the first ac stacking module includes: the first port, the alternating current injection circuit, the first amplifier U01, the second amplifier U02, the first resistor R01, the second resistor R02, the third resistor R03, the fourth resistor R04 and the fifth resistor R05;
the first end of the first port is used as the first end of the first ac superposition module, the second end of the first port, the output end of the ac injection circuit and the first end of the first resistor R01 are connected to the inverting input end of the first amplifier U01 after being combined, the non-inverting input end of the first amplifier U01 is connected in series with the second resistor R02 and then grounded, the output end of the first amplifier U01, the second end of the first resistor R01 and then connected to the first end of the third resistor R03 after being combined, the inverting input end of the second amplifier U02 and the first end of the fourth resistor R04 are connected to the second end of the third resistor R03 after being combined, the non-inverting input end of the second amplifier U02 and the fifth resistor R05 are connected in series and then grounded, and the output end of the second amplifier U02 and the second end of the fourth resistor R04 are connected to the first input end of the first voltage conversion circuit after being combined.
The output end of the alternating current injection circuit is used for injecting alternating current components, the first amplifier U01, the second amplifier U02, the first resistor R01, the second resistor R02, the third resistor R03, the fourth resistor R04 and the fifth resistor R05 form two reverse adders, and the alternating current components injected by the alternating current injection circuit and the input electric signals received from the first battery module through the first port are processed by the two reverse adders, so that superposition signals of the input electric signals and the alternating current components can be obtained.
Specifically, referring to fig. 5B, the first ac superposition module may further include a sixth voltage follower a06, a seventh voltage follower a07, a twenty-sixth resistor R28, and a twenty-seventh resistor R29, where an input end of the sixth voltage follower a06 is connected to an output end of the ac injection circuit in the first ac superposition module, an output end of the sixth voltage follower a06 is connected to a first end of the twenty-sixth resistor R28, an input end of the seventh voltage follower a07 is connected to a first port of the first ac superposition module, an output end of the seventh voltage follower a07 is connected to a first end of the twenty-seventh resistor R29, a second end of the twenty-sixth resistor R28, a second end of the twenty-seventh resistor R29, and a first end of the first resistor R01 are connected to an inverting input end of the first amplifier U01 after being combined. The sixth voltage follower a06 and the twenty-sixth resistor R28 are used for amplifying the alternating current component of the output of the alternating current injection circuit, and the seventh voltage follower a07 and the twenty-seventh resistor R29 are used for amplifying the input electric signal from the first port.
Referring to fig. 6, in one possible example, the first current acquisition circuit includes: a sixth resistor R06, a seventh resistor R07 and a first capacitor C01; the current sampling port of the first current acquisition circuit is respectively connected with the second end of the first alternating current superposition module, the first input end of the first voltage conversion circuit and the first end of the sixth resistor R06, the first end of the seventh resistor R07, the first end of the first capacitor C01 and the first end of the isolation circuit are connected with the second end of the sixth resistor R06 after being combined, and the second end of the seventh resistor R07 and the second end of the first capacitor C01 are grounded after being combined.
In a specific implementation, the sixth resistor R06, the seventh resistor R07 and the first capacitor C01 form a resistor voltage-dividing circuit, which is used for sampling the current collected by the current sampling port, and meanwhile, the collected current can be filtered due to the fact that the resistor voltage-dividing circuit comprises the first capacitor C01.
Referring to fig. 7, in one possible example, the first filter circuit includes: an eighth resistor R08, a second capacitor C02, and a third capacitor C03; the first end of the second capacitor C02 and the first end of the eighth resistor R08 are combined and then serve as the first end of the first filter circuit, the second end of the second capacitor C02 is grounded, the second end of the eighth resistor R08 and the first end of the third capacitor C03 are combined and then serve as the second end of the first filter circuit, and the second end of the third capacitor C03 is grounded.
In a specific implementation, because the ac superposition module superimposes an ac component on an input electrical signal output to the voltage conversion module by the first battery module, that is, when the superimposed signal is subjected to current sampling, the sampled current has both a current dc component and a current ac component, so that the current dc component in the collected current can be filtered through the eighth resistor R08, the second capacitor C02 and the third capacitor C03 provided in the first filter circuit, and a final target current sampling value is obtained through subsequent processing by the first differential amplification circuit, and the target current sampling value is a harmonic current.
Referring to fig. 8, in one possible example, the first differential amplifying circuit includes: the first voltage follower A01, the second voltage follower A02, the third amplifier U03, the ninth resistor R09, the tenth resistor R10, the eleventh resistor R11, the twelfth resistor R12, the thirteenth resistor R13, the fourth capacitor C04, the fifth capacitor C05, the sixth capacitor C06 and the first power supply module;
the input end of the first voltage follower a01 is used as a first input end of the first differential amplifying circuit, the input end of the second voltage follower a02 is used as a second input end of the first differential amplifying circuit, the output end of the first voltage follower a01 is connected with the first end of the ninth resistor R09, the second end of the ninth resistor R09, the first end of the tenth resistor R10 and the first end of the fourth capacitor C04 are connected with the positive input end of the third amplifier U03 after being combined, the second end of the tenth resistor R10 and the second end of the fourth capacitor C04 are connected with the positive electrode of the first power supply module after being combined, and the negative electrode of the first power supply module is grounded; the output end of the second voltage follower a02 is connected to the first end of the eleventh resistor R11, the second end of the eleventh resistor R11, the first end of the twelfth resistor R12, and the first end of the fifth capacitor C05 are connected to the inverting input end of the third amplifier U03 after being combined, the second end of the twelfth resistor R12, the second end of the fifth capacitor C05, and the output end of the third amplifier U03 are connected to the first end of the thirteenth resistor R13 after being combined, the second end of the thirteenth resistor R13 is connected to the first end of the sixth capacitor C06, and the second end of the sixth capacitor C06 is grounded.
The first power supply module is used for providing bias voltage. The first differential amplifying circuit can further filter and amplify the direct current component of the electric signal processed by the first filtering circuit, finally obtain a target current sampling value, and send the target current sampling value to the control module through the first output port.
Referring to fig. 9A, in one possible example, the voltage sampling module includes: the first voltage sampling port B, the second voltage sampling port C, the second filter circuit, the second differential amplifying circuit and the second output port;
the first ends of the N alternating current superposition modules are connected with the first voltage sampling port B after being combined, the first voltage sampling port B is also connected with the first output end of the first battery module and the first input end of the second filter circuit, the second voltage sampling port C is respectively connected with the second output end of the first battery module, the second input end of the voltage conversion module and the second input end of the second filter circuit, the first output end of the second filter circuit is connected with the first input end of the second differential amplification circuit, the second output end of the second filter circuit is connected with the second input end of the second differential amplification circuit, and the second output port is respectively connected with the output end of the second differential amplification circuit and the control module;
The first voltage sampling port B and the second voltage sampling port C are used for voltage sampling of the superimposed signal, the second filter circuit is used for filtering voltage direct current components in the collected voltage, the second differential amplifying circuit is used for amplifying the voltage sampling value after the voltage direct current components are filtered to obtain the target voltage sampling value, and the target voltage sampling value is sent to the control module through the second output port.
It should be noted that, fig. 9A illustrates a case where N is greater than 1, and when N is 1, the connection relationship between the voltage sampling port and the ac superposition module may be as shown in fig. 9B.
In this example, the voltage sampling module may sample the voltage of the superimposed signal, filter the voltage dc component in the collected voltage, and finally obtain the harmonic voltage as the target voltage sampling value, which is used to calculate the internal resistance of the first battery module.
Referring to fig. 10, in one possible example, the second filter circuit includes: a seventh capacitor C07, a fourteenth resistor R14; the first end of the seventh capacitor C07 is used as the first input end of the second filter circuit, the second end of the seventh capacitor C07 and the first end of the fourteenth resistor R14 are combined to be used as the first output end of the second filter circuit, and the second end of the fourteenth resistor R14 and the second input end of the second filter circuit are combined to be used as the second output end of the second filter circuit.
In a specific implementation, because the ac superposition module superimposes an ac component on an input electrical signal output to the voltage conversion module by the first battery module, that is, when the superimposed signal is subjected to voltage sampling, the sampled voltage has both a voltage dc component and a voltage ac component, so that the second filter circuit is provided with a seventh capacitor and a fourteenth resistor, and the voltage dc component in the collected voltage is filtered, so that a final target voltage sampling value is obtained through subsequent processing by the second differential amplification circuit, and the target voltage sampling value is a harmonic voltage.
Referring to fig. 11, in one possible example, the second differential amplifying circuit includes: a fourth amplifier U04, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighth capacitor C08, a ninth capacitor C09, a tenth capacitor C10, and a second power supply module;
the positive phase input end of the fourth amplifier U04, the first end of the fifteenth resistor R15 and the first end of the eighth capacitor C08 are combined and then used as the first input end of the second differential amplifying circuit, the second end of the fifteenth resistor R15 and the second end of the eighth capacitor C08 are combined and then connected with the positive electrode of the second power supply module, and the negative electrode of the second power supply module is grounded; the reverse input end of the fourth amplifier U04, the first end of the sixteenth resistor R16 and the first end of the ninth capacitor C09 are combined and then used as the second input end of the second differential amplifying circuit, the second end of the sixteenth resistor R16 and the second end of the ninth capacitor C09 are combined and then connected with the first end of the seventeenth resistor R17, the second end of the seventeenth resistor R17 is connected with the first end of the tenth capacitor C10, the second end of the tenth capacitor C10 is grounded, and the second end of the seventeenth resistor R17 is used as the output end of the second differential amplifying circuit.
The second power supply module is used for providing bias voltage.
In a specific implementation, the second differential amplifying circuit may further perform filtering and amplifying treatment on the direct current component of the electrical signal processed by the second filtering circuit, and finally obtain a target voltage sampling value, and send the target voltage sampling value to the control module through the second output port.
Referring to fig. 12, in one possible example, the voltage sampling module further includes: an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a first zener diode D01, a second zener diode D02, and a third voltage follower a03;
the first end of the eighteenth resistor R18 is connected to the first output end of the second filter circuit, the negative electrode of the first zener diode D01 and the second end of the eighteenth resistor R18 are connected to the input end of the third voltage follower a03 after being combined, the output end of the third voltage follower a03 is connected to the first end of the nineteenth resistor R19, the second end of the nineteenth resistor R19 is connected to the first input end of the second differential amplifier circuit, the positive electrode of the first zener diode D01 is connected to the positive electrode of the second zener diode D02, the negative electrode of the second zener diode D02 and the second output end of the second filter circuit are connected to the first end of the twentieth resistor R20 after being combined, and the second end of the twentieth resistor R20 is connected to the second input end of the second differential amplifier circuit.
The first zener diode D01 and the second zener diode D02 are arranged in the voltage sampling module in an anti-series mode, so that overvoltage protection can be achieved on an internal circuit of the voltage sampling module, and circuit safety is guaranteed.
Referring to fig. 13A and 13B, the internal resistance calculation process of the first battery module will be described below with reference to specific simulation circuit schematic diagrams. Fig. 13A is a schematic diagram of a simulation circuit of the current sampling module, and fig. 13B is a schematic diagram of a simulation circuit of the voltage sampling module. Taking N as 8 as an example, the power supplies I1, I2 and I3 are respectively used for simulating the superimposed alternating current component, the input electric signal and the superimposed signal, iout corresponds to the first output port, vout corresponds to the second output port, DC1 and DC2 are respectively a first power supply module and a second power supply module, and the isolation circuit is formed by a08-a15, a R30-R37 and a capacitor C11. Fig. 13A only schematically shows an ac superposition module and a first current collecting circuit (i.e. a circuit structure connected after the input ends of a08-a15 are combined), and in practical application, when N is 8, the number of ac superposition modules and current collecting circuits is also 8.
Based on fig. 13A and 13B, the calculation process of the internal resistance obtained by simulation is as follows:
Assuming that the internal resistance of the stack (i.e., the first cell module) of the hydrogen fuel cell is Rs, the amplitude of the alternating voltage component generated thereon is Uac, the amplitude of the alternating current component is Iac (typically 1-10A), and the generated frequency is 2-1000Hz.
Uac＝Iac·Rs
According to the schematic diagram of the simulation circuit, the arithmetic expression of the target voltage sampling value U (t) at the moment t is as follows:
wherein F is the frequency, DC2 is the output voltage of the second battery module, and Uac is replaced by Us (t) (i.e., the ac voltage component generated on the first battery module at time t), and the ratio relationship between U (t) (i.e., vout in fig. 13B) and Us (t) (i.e., vin in fig. 13B) can be obtained from the above equation;
according to the schematic diagram of the simulation circuit, the arithmetic expression of the target voltage sampling value I (t) of the current sampling port at the moment t is as follows:
where F Is the frequency, DC1 Is the output voltage of the first battery module, and Iac Is replaced with Is (t) (i.e., the alternating current component generated on the first battery module at time t), and the ratio relationship between I (t) (i.e., iout in fig. 13A) and Is (t) (i.e., V1 in fig. 13A) can be derived from the above equation.
Finally, according to the determined ratio relation between the U (t) and the U (t), the determined ratio relation between the I (t) and the IS (t), and the following formula, the relation between the internal resistance Rs of the electric pile of the hydrogen fuel cell and the U (t) and the I (t) can be obtained:
The above is the calculation process of the internal resistance of the pile, and the function of monitoring the internal resistance of the pile in real time can be realized by generating a harmonic current and sampling the voltage and the current.
It can be seen that, according to the battery internal resistance detection device provided by the application, the alternating current component is superimposed in the input electric signal output to the voltage conversion module to the first battery module, and the current and voltage sampling is carried out on the superimposed signal of the input electric signal and the alternating current component of the voltage conversion module, so that the internal resistance of the first battery module is finally calculated.
Example 2:
the present embodiment provides a dc-dc converter, including the battery internal resistance detection device and the voltage conversion module described in embodiment 1.
Example 3:
the present embodiment provides a vehicle including the battery internal resistance detection device described in embodiment 1 or the dc-dc converter described in embodiment 2.
It can be seen that the application provides a battery internal resistance detection device, direct current-to-direct current converter and vehicle, battery internal resistance detection device is through superpose alternating current component in the input electric signal that gives voltage conversion module to first battery module output, and carry out the electric current voltage sampling to the superimposed signal of the input electric signal and alternating current component of voltage conversion module, with the internal resistance that calculates first battery module at last, because voltage conversion module's operation control originally needs to set up the current sampling module, therefore, when calculating first battery module internal resistance, carry out the electric current voltage sampling to voltage conversion module, need not the total output current of extra newly-increased current sampling module come sampling first battery module, be favorable to reducing the electric current sampling cost that the battery internal resistance detected.
Finally, it should be emphasized that the present application is not limited to the embodiments described above, which are merely preferred examples of the present application and are not intended to limit the present application, but any modifications, equivalents, improvements, etc. within the spirit and principles of the present application are intended to be included in the scope of the present application.
Claims (11)
1. A battery internal resistance detection device, characterized by comprising: the system comprises an alternating current superposition module, a current sampling module, a voltage sampling module and a control module, wherein a first output end of a first battery module is connected with a first end of the alternating current superposition module, a second end of the alternating current superposition module is connected with a first input end of a voltage conversion module, a second input end of the voltage conversion module is connected with a second output end of the first battery module, a first voltage sampling port of the voltage sampling module is arranged between the first output end of the first battery module and the first end of the alternating current superposition module, a second voltage sampling port of the voltage sampling module is arranged between the second output end of the first battery module and the second input end of the voltage conversion module, and a current sampling port of the current sampling module is arranged between the second end of the alternating current superposition module and the first input end of the voltage conversion module, and the control module is respectively connected with the current sampling module and the voltage sampling module;
The alternating current superposition module is used for superposing alternating current components in an input electric signal of the voltage conversion module, wherein the input electric signal is an electric signal output to the voltage conversion module by the first battery module;
the current sampling module is used for performing current sampling on the superposition signal of the input electric signal and the alternating current component, filtering out the current direct current component in the acquired current to obtain a target current sampling value, and sending the target current sampling value to the control module;
the voltage sampling module is used for performing voltage sampling on the superimposed signal, filtering out a voltage direct current component in the acquired voltage to obtain a target voltage sampling value, and sending the target voltage sampling value to the control module;
the control module is used for determining the internal resistance of the first battery module according to the target current sampling value and the target voltage sampling value.
2. The battery internal resistance detection device according to claim 1, wherein the voltage conversion module comprises N parallel voltage conversion circuits, and the current sampling module comprises N current acquisition circuits, an isolation circuit, a first filter circuit, a first differential amplification circuit, and a first output port; the alternating current superposition modules comprise N, N is a positive integer, wherein the N alternating current superposition modules comprise first alternating current superposition modules, the N current acquisition circuits comprise first current acquisition circuits, and the N voltage conversion circuits comprise first voltage conversion circuits;
The first ends of the N alternating current superposition modules are connected with the first output end of the first battery module after being combined, the second ends of the first alternating current superposition modules are connected with the first input end of the first voltage conversion circuit, the current sampling port of the first current acquisition circuit is arranged between the second ends of the first alternating current superposition modules and the first input end of the first voltage conversion circuit, the second input ends of the N voltage conversion circuits are connected with the second output end of the first battery module after being combined, the output ends of the N current acquisition circuits are connected with the first end of the isolation circuit after being combined, the first ends of the first filter circuit are respectively connected with the second ends of the isolation circuit and the first input end of the first differential amplification circuit, and the second ends of the first filter circuit are connected with the second input end of the first differential amplification circuit.
3. The battery internal resistance detection apparatus according to claim 2, wherein when N is an integer greater than 1, the current sampling module further includes: the input end of the first adder circuit is connected with the second end of the isolation circuit, the output end of the first adder circuit is respectively connected with the first end of the first filter circuit and the first input end of the first differential amplifying circuit, and the first adder circuit is used for carrying out superposition processing on currents acquired by the N current acquisition circuits.
4. The battery internal resistance detection apparatus according to claim 2, wherein the first ac superimposition module includes: the first port, the alternating current injection circuit, the first amplifier, the second amplifier, the first resistor, the second resistor, the third resistor, the fourth resistor and the fifth resistor;
the first end of the first port is used as the first end of the first alternating current superposition module, the second end of the first port, the output end of the alternating current injection circuit and the first end of the first resistor are connected with the inverting input end of the first amplifier after being combined, the non-inverting input end of the first amplifier is connected with the second resistor in series and then grounded, the output end of the first amplifier, the second end of the first resistor are connected with the first end of the third resistor after being combined, the inverting input end of the second amplifier and the first end of the fourth resistor are connected with the second end of the third resistor after being combined, the non-inverting input end of the second amplifier is connected with the fifth resistor in series and then grounded, and the output end of the second amplifier and the second end of the fourth resistor are connected with the first input end of the first voltage conversion circuit after being combined.
5. The battery internal resistance detection device according to claim 2, wherein the first current collection circuit includes: a sixth resistor, a seventh resistor and a first capacitor;
The current sampling port of the first current acquisition circuit is respectively connected with the second end of the first alternating current superposition module, the first input end of the first voltage conversion circuit and the first end of the sixth resistor, the first end of the seventh resistor, the first end of the first capacitor and the first end of the isolation circuit are connected with the second end of the sixth resistor after being combined, and the second end of the seventh resistor and the second end of the first capacitor are grounded after being combined.
6. The battery internal resistance detection apparatus according to claim 2, wherein the first filter circuit includes: an eighth resistor, a second capacitor and a third capacitor;
the first end of the second capacitor and the first end of the eighth resistor are combined to serve as the first end of the first filter circuit, the second end of the second capacitor is grounded, the second end of the eighth resistor and the first end of the third capacitor are combined to serve as the second end of the first filter circuit, and the second end of the third capacitor is grounded.
7. The battery internal resistance detection apparatus according to claim 2, wherein the first differential amplification circuit includes: the first power supply module comprises a first voltage follower, a second voltage follower, a third amplifier, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor and a first power supply module;
The input end of the first voltage follower is used as a first input end of the first differential amplifying circuit, the input end of the second voltage follower is used as a second input end of the first differential amplifying circuit, the output end of the first voltage follower is connected with the first end of the ninth resistor, the second end of the ninth resistor, the first end of the tenth resistor and the first end of the fourth capacitor are connected with the positive input end of the third amplifier after being combined, the second end of the tenth resistor and the second end of the fourth capacitor are connected with the positive electrode of the first power supply module after being combined, and the negative electrode of the first power supply module is grounded; the output end of the second voltage follower is connected with the first end of the eleventh resistor, the second end of the eleventh resistor, the first end of the twelfth resistor and the first end of the fifth capacitor are connected with the inverting input end of the third amplifier after being combined, the second end of the twelfth resistor, the second end of the fifth capacitor and the output end of the third amplifier are connected with the first end of the thirteenth resistor after being combined, the second end of the thirteenth resistor is connected with the first end of the sixth capacitor, and the second end of the sixth capacitor is grounded.
8. The battery internal resistance detection apparatus according to any one of claims 2 to 7, wherein the voltage sampling module includes: the first voltage sampling port, the second filter circuit, the second differential amplifying circuit and the second output port;
the first ends of the N alternating current superposition modules are connected with the first voltage sampling port after being combined, the first voltage sampling port is also connected with the first output end of the first battery module and the first input end of the second filter circuit, the second voltage sampling port is respectively connected with the second output end of the first battery module, the second input end of the voltage conversion module and the second input end of the second filter circuit, the first output end of the second filter circuit is connected with the first input end of the second differential amplification circuit, the second output end of the second filter circuit is connected with the second input end of the second differential amplification circuit, and the second output port is respectively connected with the output end of the second differential amplification circuit and the control module;
the first voltage sampling port and the second voltage sampling port are used for voltage sampling of the superimposed signal, the second filter circuit is used for filtering voltage direct current components in the collected voltage, the second differential amplifying circuit is used for amplifying the voltage sampling value after the voltage direct current components are filtered to obtain the target voltage sampling value, and the target voltage sampling value is sent to the control module through the second output port.
9. The battery internal resistance detection device according to claim 8, wherein the voltage sampling module further comprises: an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a first zener diode, a second zener diode, and a third voltage follower;
the first end of the eighteenth resistor is connected with the first output end of the second filter circuit, the negative electrode of the first zener diode and the second end of the eighteenth resistor are connected with the input end of the third voltage follower after being combined, the output end of the third voltage follower is connected with the first end of the nineteenth resistor, the second end of the nineteenth resistor is connected with the first input end of the second differential amplifying circuit, the positive electrode of the first zener diode is connected with the positive electrode of the second zener diode, the negative electrode of the second zener diode and the second output end of the second filter circuit are connected with the first end of the twentieth resistor after being combined, and the second end of the twentieth resistor is connected with the second input end of the second differential amplifying circuit.
10. A dc-dc converter comprising a battery internal resistance detection device according to any one of claims 1 to 9 and a voltage conversion module.
11. A vehicle comprising the battery internal resistance detection apparatus according to any one of claims 1 to 9 or the dc-dc converter according to claim 10.
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