CN112928344B - Voltage detection circuit and method of power battery circuit - Google Patents

Voltage detection circuit and method of power battery circuit Download PDF

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Publication number
CN112928344B
CN112928344B CN201911233043.3A CN201911233043A CN112928344B CN 112928344 B CN112928344 B CN 112928344B CN 201911233043 A CN201911233043 A CN 201911233043A CN 112928344 B CN112928344 B CN 112928344B
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circuit
switching
relay
voltage
power battery
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CN112928344A (en
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李焕明
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Beijing Electric Vehicle Co Ltd
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Beijing Electric Vehicle Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
    • 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
    • G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
    • G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
    • G01R31/3278—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches of relays, solenoids or reed switches
    • 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]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4278—Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
    • 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

Abstract

The invention provides a voltage detection circuit and a method of a power battery circuit, wherein the detection circuit comprises: the relay comprises a main fuse, a pre-charging resistor, a main positive relay, a main negative relay and a pre-charging relay; the positive electrode of the power battery is connected to the positive electrode of the output port through the pre-charging resistor and the pre-charging relay; the negative electrode of the power battery is connected to the negative electrode of the output port through the main fuse and the main negative relay; a plurality of switching circuits, each comprising a resistor and a switching device connected in series; the detection circuit comprises a sampling resistor and a voltage detection device bridged at two ends of the sampling resistor. The detection method comprises the following steps: controlling the working state of a switching device in the switching circuit according to a target voltage to be tested; and detecting the voltage signal acquired by the detection circuit, and calculating according to the voltage signal to obtain the target voltage. The invention reduces the number of amplifiers and resistors by H-bridge switching.

Description

Voltage detection circuit and method of power battery circuit
Technical Field
The invention relates to a battery management system, in particular to a voltage detection circuit and device of a power battery circuit and an electric automobile.
Background
Important functions of the battery management system BMS include the following voltage monitoring functions: monitoring the internal voltage of the battery and the output end of a battery circuit, namely the voltage of the whole vehicle end; monitoring the voltage of the pre-charging relay at the rear part of the pre-charging resistor to judge the working state of the pre-charging resistor; the state of two relay switches of the battery system is monitored, such as whether the relays are stuck or an open circuit fault.
The circuit principle of the main scheme of the prior art is shown in fig. 1:
the three voltage division circuits obtain three voltages, the three integrated operational amplifiers perform small voltage sampling and send the sampled voltages to a Battery Management System (BMS) processor, the three integrated operational amplifiers perform operation to obtain three voltage values, and whether the element to be detected works normally is judged according to the voltage values;
the three high-speed switches mainly prevent the battery management system BMS from being powered off, the divider resistor continuously consumes power, and the power consumption circuit needs to be switched off when the battery management system BMS does not work.
In the prior art, a detection circuit has large quantity of devices, high cost and lower use flexibility and compatibility.
Disclosure of Invention
The embodiment of the invention provides a voltage detection circuit and a voltage detection method for a power battery circuit, which are used for solving the problems of errors, low precision and high cost caused by the need of a plurality of detection circuits in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
a voltage detection circuit for a power cell circuit, comprising:
the relay comprises a main fuse, a pre-charging resistor, a main positive relay, a main negative relay and a pre-charging relay; the positive pole of the power battery is connected to the positive pole of the output port through the pre-charging resistor and the pre-charging relay; the negative electrode of the power battery is connected to the negative electrode of the output port through the main fuse and the main negative relay;
a plurality of switching circuits, each comprising a resistor and a switching device connected in series;
the detection circuit comprises a sampling resistor and a voltage detection device bridged at two ends of the sampling resistor;
and the output end of the voltage detection circuit of the power battery circuit is connected with the whole vehicle circuit.
Further, the voltage detection circuit of the power battery circuit further comprises:
the first end of the first switch circuit is connected with the first end of the sampling resistor and the first end of the fourth switch circuit, the second end of the first switch circuit is connected with the anode of the power battery, and the second end of the sampling resistor is connected with the cathode of the power battery through the main fuse;
the first end of the second switch circuit is connected between the pre-charging resistor and the pre-charging relay, and the second end of the second switch circuit is connected between the resistor of the fourth switch circuit and the switch device;
a first end of the third switch circuit is connected to the positive electrode of the output port, and a second end of the third switch circuit is connected to a second end of the second switch circuit;
a second terminal of the fourth switching circuit is connected between the main negative relay and the negative terminal of the output port.
Further, the switching device of the switching circuit is a MOSFET switch or an optocoupler switch.
Further, the voltage detection device is an integrated operational amplifier.
A voltage detection method of a power battery circuit is applied to the voltage detection circuit and comprises the following steps:
controlling the working state of a switching device in the switching circuit according to a target voltage to be tested;
and detecting the voltage signal acquired by the detection circuit, and calculating according to the voltage signal to obtain the target voltage.
Further, the step of controlling the operating state of the switching device in the switching circuit according to the target voltage to be tested includes:
and when the target voltage is the internal voltage of the power battery, closing the switching devices of the first switching circuit, and opening the switching devices of the second switching circuit, the third switching circuit and the fourth switching circuit, wherein the main positive relay, the main negative relay and the pre-charging relay are all opened.
Further, the step of controlling the operating state of the switching device in the switching circuit according to the target voltage to be tested includes:
and when the target voltage is the output voltage of the power battery after passing through the pre-charging resistor, the switching devices of the second switching circuit and the fourth switching circuit are closed, the switching devices of the first switching circuit and the third switching circuit are opened, and the main positive relay, the main negative relay and the pre-charging relay are all opened.
Further, the step of controlling the operating state of the switching device in the switching circuit according to the target voltage to be tested includes:
when the target voltage is the output voltage of the output port, the switching devices of the third switching circuit, the fourth switching circuit and the main positive relay are closed, the switching devices of the first switching circuit and the second switching circuit are opened, and the main negative relay and the pre-charging relay are opened.
Further, the step of controlling the operating state of the switching device in the switching circuit according to the target voltage to be tested includes:
and when the target voltage is the voltage of the main positive relay, the switching device of the first switching circuit, the switching device of the third switching circuit, the switching device of the fourth switching circuit, the main negative relay and the main positive relay are closed, and the switching device of the second switching circuit and the pre-charging relay are disconnected.
Further, the step of controlling the operating state of the switching device in the switching circuit according to the target voltage to be tested includes:
and when the target voltage is the voltage of the main negative relay, the switching device of the first switching circuit, the switching device of the fourth switching circuit and the main negative relay are closed, the switching devices of the second switching circuit and the third switching circuit are opened, and the main positive relay and the pre-charging relay are both opened.
Further, the step of controlling the operating state of the switching device in the switching circuit according to the target voltage to be tested includes:
and when the target voltage is the voltage of the pre-charging relay, the switching device of the second switching circuit, the switching device of the third switching circuit, the switching device of the fourth switching circuit, the main negative relay and the pre-charging relay are closed, and other switching devices and the main positive relay are disconnected.
The invention has the beneficial effects that:
according to the voltage detection circuit and method of the power battery circuit in the scheme, an H-bridge switching mode is adopted, and the number of integrated operational amplifiers and resistors is reduced on the basis of ensuring the functions through switching of the switch and the relay, so that the cost is low; the compatibility is good, and the resistor can be designed with various resistance values according to different system voltages; the method combines a calculation formula to detect and confirm different states of the multiple systems, and has the advantages of strong function, simple principle and high precision and accuracy.
Drawings
FIG. 1 is a circuit schematic of a voltage detection circuit of a prior art power cell circuit;
FIG. 2 is a schematic circuit diagram of a voltage detection circuit of a power battery circuit according to an embodiment of the invention;
fig. 3 is a schematic diagram illustrating steps of a voltage detection method of a power battery circuit according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The invention provides a voltage detection circuit and method of a power battery circuit, aiming at the problems of error, low precision and high cost of a plurality of detection circuits in the prior art.
As shown in fig. 2, an embodiment of the present invention provides a voltage detection circuit for a power battery circuit, including:
the main fuse S, the pre-charging resistor Rp, the main positive relay K1, the main negative relay K2 and the pre-charging relay K3; the positive electrode of the power battery E is connected to the positive electrode of an output port through the pre-charging resistor Rp and a pre-charging relay K3; and the negative electrode of the power battery E is connected to the negative electrode of the output port through the main fuse S and the main negative relay K2.
A plurality of switching circuits, each comprising a resistor and a switching device connected in series;
for example, the first switch circuit 1 includes a first resistor R1 and a first switch device Q1 connected in series; the second switch circuit 2 comprises a second resistor R2 and a second switch device Q2 which are connected in series; the third switch circuit 3 comprises a third resistor R3 and a third switch device Q3 which are connected in series; the fourth switching circuit 4 includes a fourth resistor R4 and a fourth switching device Q4 connected in series.
And the detection circuit 5 comprises a sampling resistor R5 and a voltage detection device connected across the sampling resistor R5.
And the output end of the voltage detection circuit of the power battery circuit is connected with the whole vehicle circuit.
Optionally, a first terminal of the first switch circuit 1 is connected to the first terminal of the sampling resistor R5 and the first terminal of the fourth switch circuit 4, a second terminal of the first switch circuit 1 is connected to the positive electrode of the power battery E, and a second terminal of the sampling resistor R5 is connected to the negative electrode of the power battery E through the main fuse S.
A first terminal of the second switch circuit 2 is connected between the pre-charge resistor Rp and the pre-charge relay K3, and a second terminal of the second switch circuit 2 is connected between the fourth resistor R4 and the fourth switch device Q4.
A first terminal of the third switch circuit 3 is connected to the positive electrode of the output port, and a second terminal of the third switch circuit 3 is connected to a second terminal of the second switch circuit 2.
The second end of the fourth switching circuit 4 is connected between the main negative relay K2 and the negative pole of the output port.
Optionally, the switching device of the switching circuit is a MOSFET switch or an optocoupler switch.
Optionally, the voltage detection device is an integrated operational amplifier, and is responsible for voltage sampling and digital-to-analog conversion, and the sampling resistor R5 is a high-precision sampling resistor.
The voltage detection circuit of the power battery circuit of the embodiment of the invention uses an H-bridge switching mode, reduces the number of integrated operational amplifiers and resistors by switching the switch and the relay on the basis of ensuring the functions, and has low cost; the compatibility is good, and the resistor can be designed with various resistance values according to different system voltages; the method combines a calculation formula to detect and confirm different states of the multiple systems, and has the advantages of strong function, simple principle and high precision and accuracy.
As shown in fig. 3, an embodiment of the present invention further provides a voltage detection method for a power battery circuit, which is applied to the voltage detection circuit described above, and includes:
step 100, controlling the working state of a switching device in the switching circuit according to a target voltage to be tested;
and 200, detecting a voltage signal acquired by the detection circuit, and calculating to obtain the target voltage according to the voltage signal.
Specifically, when the target voltage is the internal voltage of the power battery E, the voltage detection method of the power battery circuit includes:
closing the first switching device Q1, opening the second switching device Q2, the third switching device Q3 and the fourth switching device Q4, and opening the main positive relay K1, the main negative relay K2 and the precharge relay K3;
here, the voltage signal collected by the detection circuit is converted into a first voltage value V1, the rated voltage of the power battery is V, and in the closed loop at this time, the first resistor R1 and the sampling resistor R5 divide the voltage, so that when the electric quantity of the power battery E is sufficient, the first voltage value V1 is V × (R1+ R5)/R5; when the first voltage value V1 is less than Vx (R1+ R5)/R5, the power battery E is insufficient in charge; if the first voltage value V1 is zero, it is determined that the electric quantity of the power battery E is zero or the main fuse S is blown.
Specifically, when the target voltage is the output voltage of the power battery E after passing through the pre-charging resistor Rp, the method for detecting the voltage of the power battery circuit includes:
closing the second and fourth switching devices Q2 and Q4, the first and third switching devices Q1 and Q3, the main positive relay K1, the main negative relay K2, and the precharge relay K3;
here, the voltage signal collected by the detection circuit is converted into a second voltage value V2, the rated voltage of the power battery is V, and in the closed loop at this time, the second resistor R2 and the sampling resistor R5 divide the voltage, so that when the pre-charge resistor is in a normal operating state, the second voltage value V2 is V × (R2+ R5)/R5, and when the pre-charge resistor is broken, the second voltage value V2 is 0.
Specifically, when the target voltage is the output voltage of the output port, the voltage detection method of the power battery circuit includes:
closing the third switching device Q3, the fourth switching device Q4 and the main positive relay K1, the first switching device Q1 and the second switching device Q2, and the main negative relay K2 and the precharge relay K3;
here, the voltage signal collected by the detection circuit is converted into a third voltage value V3, the rated voltage of the power battery is V, and in the closed loop at this time, the third resistor R3 and the sampling resistor R5 divide voltage, so that when the operating state of the whole vehicle circuit is normal, the third voltage value V3 is V × (R3+ R5)/R5; when the third voltage value V3 is not equal to V × (R3+ R5)/R5, a short circuit or an abnormal condition of the circuit occurs in the electric circuit of the entire vehicle.
Specifically, when the target voltage is the voltage of the main positive relay K1, the voltage detection method of the power battery circuit comprises the following steps:
closing the first switching device Q1, the third switching device Q3, the fourth switching device Q4, the main positive relay K1 and the main negative relay K2, the second switching device Q2 and the precharge relay K3 being open;
here, the voltage signal acquired by the detection circuit is converted into a fourth voltage value V4, the rated voltage of the power battery is V, and if the main positive relay can be normally closed, in a closed loop at this time, the fourth resistor R4 and the sampling resistor R5 are connected in parallel, then connected in parallel with the first resistor R1 and the third resistor R3, and then connected in series, so that the voltage value V4 ═ V × (R4// R5)/[ (R1// R3) + (R4// R5) ]; if the main positive relay cannot be normally closed, in a closed loop at the time, the fourth resistor R4 and the sampling resistor R5 are connected in parallel and then connected in series with the first resistor R1, so that the voltage value V4 is V x (R4// R5)/[ R1+ (R4// R5) ].
Specifically, when the target voltage is the voltage of the main negative relay K2, the voltage detection method of the power battery circuit comprises the following steps:
the first switching device Q1, the fourth switching device Q4 and the main negative relay K2 are closed, the second switching device Q2 and the third switching device Q3 are opened, and the main positive relay K2 and the pre-charging relay K3 are opened;
here, the voltage signal collected by the detection circuit is converted into a fifth voltage value V5, the rated voltage of the power battery is V, and if the main and negative relays can be normally closed, in a closed loop at this time, the fourth resistor R4 is connected in parallel with the sampling resistor R5 and then connected in series with the first resistor R1, so that the voltage value V5 is V × (R4+ R5)/[ R1+ (R4// R5) ]; if the main negative relay cannot be normally closed, in the closed loop at this time, the sampling resistor R5 is connected in series with the first resistor R1, so that the voltage value V5 is V × R5/(R1+ R5).
Specifically, when the target voltage is the voltage of a pre-charging relay, the voltage detection method of the power battery circuit comprises the following steps:
closing the second switching device Q2, the third switching device Q3, the fourth switching device Q4, the main negative relay K2 and the pre-charge relay K3, and the other switching devices and the main positive relay K1 being open;
here, the voltage signal acquired by the detection circuit is converted into a sixth voltage value V6, the rated voltage of the power battery is V, and if the pre-charging relay can be normally closed, in the closed loop at this time, the fourth resistor R4 and the sampling resistor R5 are connected in parallel and then connected in parallel with the second resistor R2 and the third resistor R3 and then connected in series, so that the voltage value V6 is × (R4// R5)/[ (R2// R3) + (R4// R5) ]; if the pre-charging relay cannot be normally closed, in the closed loop at the moment, the sampling resistor R5 is connected with the second resistor R2 in series, so that the voltage value V6 is V x (R4// R5)/[ R2+ (R4// R5) ].
According to the voltage detection circuit and method of the power battery circuit, an H-bridge switching mode is adopted, and through switching of the switch and the relay, on the basis of guaranteeing functions, the number of integrated operational amplifiers and resistors is reduced, and the cost is low; the compatibility is good, and the resistor can be designed with various resistance values according to different system voltages; the method combines a calculation formula to detect and confirm different states of the multiple systems, and has the advantages of strong function, simple principle and high precision and accuracy.
While the preferred embodiments of the present invention have been described, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.

Claims (9)

1. A voltage detection circuit for a power cell circuit, comprising:
the relay comprises a main fuse, a pre-charging resistor, a main positive relay, a main negative relay and a pre-charging relay; the positive pole of the power battery is connected to the positive pole of the output port through the pre-charging resistor and the pre-charging relay; the negative electrode of the power battery is connected to the negative electrode of the output port through the main fuse and the main negative relay;
a plurality of switching circuits, each comprising a resistor and a switching device connected in series;
the detection circuit comprises a sampling resistor and a voltage detection device bridged at two ends of the sampling resistor;
the output end of the voltage detection circuit of the power battery circuit is connected with the whole vehicle circuit;
the first end of the first switch circuit is connected with the first end of the sampling resistor and the first end of the fourth switch circuit, the second end of the first switch circuit is connected with the anode of the power battery, and the second end of the sampling resistor is connected with the cathode of the power battery through the main fuse;
the first end of the second switch circuit is connected between the pre-charging resistor and the pre-charging relay, and the second end of the second switch circuit is connected between the resistor of the fourth switch circuit and the switch device;
a first end of the third switch circuit is connected to the positive electrode of the output port, and a second end of the third switch circuit is connected to a second end of the second switch circuit;
a second terminal of the fourth switching circuit is connected between the main negative relay and the negative terminal of the output port.
2. The voltage detection circuit of the power battery circuit according to claim 1, wherein the switching device of the switching circuit is a MOSFET switch or an optocoupler switch; the voltage detection device is an integrated operational amplifier.
3. A voltage detection method of a power battery circuit, applied to the voltage detection circuit of any one of claims 1 to 2, comprising:
controlling the working state of a switching device in the switching circuit according to a target voltage to be tested;
and detecting the voltage signal acquired by the detection circuit, and calculating according to the voltage signal to obtain the target voltage.
4. The voltage detection method of the power battery circuit according to claim 3, wherein the step of controlling the operating state of the switching device in the switching circuit according to the target voltage to be tested comprises:
and when the target voltage is the internal voltage of the power battery, closing the switching devices of the first switching circuit, opening the switching devices of the second switching circuit, the third switching circuit and the fourth switching circuit, and opening the main positive relay, the main negative relay and the pre-charging relay.
5. The voltage detection method of the power battery circuit according to claim 3, wherein the step of controlling the operating state of the switching device in the switching circuit according to the target voltage to be tested comprises:
and when the target voltage is the output voltage of the power battery after passing through the pre-charging resistor, closing the switching devices of the second switching circuit and the fourth switching circuit, opening the switching devices of the first switching circuit and the third switching circuit, and opening the main positive relay, the main negative relay and the pre-charging relay.
6. The voltage detection method of the power battery circuit according to claim 3, wherein the step of controlling the operating state of the switching device in the switching circuit according to the target voltage to be tested comprises:
when the target voltage is the output voltage of the output port, the switching devices of the third switching circuit, the fourth switching circuit and the main positive relay are closed, the switching devices of the first switching circuit and the second switching circuit are opened, and the main negative relay and the pre-charging relay are opened.
7. The voltage detection method according to claim 3, wherein the step of controlling the operating state of the switching device in the switching circuit according to the target voltage to be tested comprises:
when the target voltage is the voltage of the main positive relay, the switching device of the first switching circuit, the switching device of the third switching circuit, the switching device of the fourth switching circuit, the main negative relay and the main positive relay are closed, and the switching device of the second switching circuit and the pre-charging relay are disconnected.
8. The voltage detection method according to claim 3, wherein the step of controlling the operating state of the switching device in the switching circuit according to the target voltage to be tested comprises:
and when the target voltage is the voltage of the main negative relay, the switching device of the first switching circuit, the switching device of the fourth switching circuit and the main negative relay are closed, the switching devices of the second switching circuit and the third switching circuit are opened, and the main positive relay and the pre-charging relay are both opened.
9. The voltage detection method according to claim 3, wherein the step of controlling the operating state of the switching device in the switching circuit according to the target voltage to be tested comprises:
and when the target voltage is the voltage of the pre-charging relay, the switching device of the second switching circuit, the switching device of the third switching circuit, the switching device of the fourth switching circuit, the main negative relay and the pre-charging relay are closed, and other switching devices and the main positive relay are disconnected.
CN201911233043.3A 2019-12-05 2019-12-05 Voltage detection circuit and method of power battery circuit Active CN112928344B (en)

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CN207924092U (en) * 2018-02-01 2018-09-28 宁波吉利汽车研究开发有限公司 A kind of relay bonding fault detection circuit of battery management system
CN109521359A (en) * 2018-12-28 2019-03-26 华人运通控股有限公司 A kind of negative relay status detection circuit of power battery master and method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008131675A (en) * 2006-11-16 2008-06-05 Toyota Industries Corp Power supply apparatus and leakage detecting method
CN108028536A (en) * 2015-09-11 2018-05-11 日立汽车系统株式会社 Battery monitoring apparatus
CN207924092U (en) * 2018-02-01 2018-09-28 宁波吉利汽车研究开发有限公司 A kind of relay bonding fault detection circuit of battery management system
CN109521359A (en) * 2018-12-28 2019-03-26 华人运通控股有限公司 A kind of negative relay status detection circuit of power battery master and method

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