CN107782950B - High voltage detection circuit and method, detector, battery system, vehicle and computer readable storage medium - Google Patents

High voltage detection circuit and method, detector, battery system, vehicle and computer readable storage medium Download PDF

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Publication number
CN107782950B
CN107782950B CN201710992992.4A CN201710992992A CN107782950B CN 107782950 B CN107782950 B CN 107782950B CN 201710992992 A CN201710992992 A CN 201710992992A CN 107782950 B CN107782950 B CN 107782950B
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China
Prior art keywords
assembly
relay
charging
negative terminal
voltage detection
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CN201710992992.4A
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CN107782950A (en
Inventor
但志敏
罗杰超
侯贻真
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Contemporary Amperex Technology Co Ltd
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Contemporary Amperex Technology Co Ltd
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0084—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to control modules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
    • G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
    • 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
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Abstract

The embodiment of the invention provides a high-voltage detection circuit and method, a detector, a battery system, a carrier and a computer readable storage medium. The high-voltage detection circuit provided by the embodiment of the invention is connected between the battery module and the negative terminal relay, and comprises: a relay detection sub-circuit, a first end of which is connected with an outer contact of the negative terminal relay; the processing component is connected with the second end of the relay detection sub-circuit; the first end of the current detection sub-circuit is connected with the negative electrode of the battery module, the second end of the current detection sub-circuit is connected with the inner side contact of the relay, and the third end of the current detection sub-circuit is further connected to the processing assembly. Therefore, the technical scheme provided by the embodiment of the invention can simplify the circuit structure and reduce the safety risk of the battery system to a certain extent.

Description

High voltage detection circuit and method, detector, battery system, vehicle and computer readable storage medium
[ field of technology ]
The present invention relates to the field of circuit technology, and in particular, to a high voltage detection circuit and method, a detector, a battery system, a vehicle, and a computer readable storage medium.
[ background Art ]
At present, the electric automobile has become a trend of development of the automobile industry instead of the fuel automobile, and the safety problem of the vehicle-mounted battery has become one of the problems of obstructing popularization of the electric automobile. At present, in order to reduce the safety risk of the battery module when supplying power, the working state of a main loop relay connected with the relay needs to be detected, so as to avoid the safety problem caused by the failure of the relay. In particular, for a negative side relay connected to a negative electrode of a battery module, it is generally necessary to separately design a high voltage detection circuit to detect whether the negative side relay is failed through the separately designed high voltage detection circuit, unlike other relays connected to a positive electrode of the battery module.
In the prior art, the high voltage detection circuit of the negative terminal relay is integrated in a battery management system (Battery Management System, BMS) in view of cost saving and reliability. Specifically, because negative terminal relay is connected on the high-voltage circuit that contains battery module in, the high-voltage detection circuit of negative terminal relay then is connected in the both ends of main circuit relay to gather the voltage at main circuit relay both ends, afterwards, transmit the voltage of gathering to the control chip of BMS in the low-voltage circuit, realize the diagnostic processing to whether negative terminal relay breaks down by BMS's control chip. In the prior art, since the high-voltage detection circuit of the negative-end relay is connected between the high-voltage loop and the low-voltage loop, an isolation device is further required to be arranged between the high-voltage detection circuit of the negative-end relay and the BMS, so that the BMS and the high-voltage detection circuit of the negative-end relay can work normally.
In the process of implementing the present invention, the inventor finds that at least the following problems exist in the prior art:
in the prior art, an isolation device is required to be arranged when a high-voltage detection circuit for detecting whether a negative terminal relay is in fault is integrated in the BMS, so that the complexity of the overall circuit structure is increased to a certain extent, and a certain safety risk of a battery system can be caused by the complex circuit structure.
[ invention ]
In view of the above, the embodiments of the present invention provide a high voltage detection circuit and method, a detector, a battery system, a vehicle and a computer readable storage medium for simplifying the circuit structure and reducing the safety risk of the battery system to a certain extent.
In a first aspect, an embodiment of the present invention provides a high voltage detection circuit connected between a battery module and a negative terminal relay, including:
a relay detection sub-circuit, a first end of which is connected with an outer contact of the negative terminal relay;
the processing component is connected with the second end of the relay detection sub-circuit;
the first end of the current detection sub-circuit is connected with the negative electrode of the battery module, the second end of the current detection sub-circuit is connected with the inner side contact of the relay, and the third end of the current detection sub-circuit is further connected to the processing assembly.
Aspects and any one of the possible implementations as described above, further provide an implementation, the relay detection sub-circuit includes:
the first end of the capacitor is connected with the outer contact of the negative terminal relay;
the first end of the first resistor is connected with the second end of the capacitor;
the first end of the first switch is connected with the second end of the first resistor, and the second end of the first switch is connected with a power supply;
the first end of the second resistor is connected with the second end of the capacitor;
and the first end of the third resistor is connected with the second end of the second resistor and the processing component, and the second end of the third resistor is grounded.
Aspects and any one of the possible implementations as described above, further provide an implementation, the current detection sub-circuit includes:
a shunt provided with a built-in resistor;
the first end of the shunt is connected with the negative electrode of the battery module;
the second end of the shunt is connected with the inner side contact of the negative terminal relay;
both ends of the built-in resistor of the shunt are connected to the processing assembly.
In a second aspect, an embodiment of the present invention provides a circuit board, including: a high voltage detection circuit of any of the above implementations.
In a third aspect, an embodiment of the present invention provides a detector, including: a high voltage detection circuit of any of the above implementations.
In a fourth aspect, an embodiment of the present invention provides a battery system including:
a battery module;
a negative side relay;
the high-voltage detection circuit of any one of the above implementation modes is connected between the battery module and the negative terminal relay.
In a fifth aspect, embodiments of the present invention provide a vehicle comprising: a high voltage detection circuit of any of the above implementations.
One of the above technical solutions has the following beneficial effects:
in the embodiment of the invention, the battery module and the negative terminal relay on the main circuit are both arranged in the high-voltage circuit, the high-voltage detection circuit provided by the embodiment of the invention is arranged between the battery module and the negative terminal relay, and meanwhile, the relay detection sub-circuit and the current detection sub-circuit in the high-voltage detection circuit are both connected with the processing assembly, and the current detection function of the main circuit and the detection function of whether the negative terminal relay is in fault or not are realized through the processing of the processing assembly. Thus, the relay detection subcircuit is arranged in the high-voltage loop, and the problems of complex circuit structure and higher cost caused by the fact that the relay detection subcircuit is integrated in the BMS and an isolation component is required to be arranged are avoided; in addition, in the embodiment of the invention, the relay detection subcircuit can be realized by utilizing the processing component existing in the detector, and no additional processing chip or processing component is needed, so that the circuit cost is further reduced, and the circuit structure is simplified; based on simplification of the circuit structure, the number and the length of the wire harnesses in the battery system are shortened, and the safety risks caused by complex circuit structure, more wire harnesses, longer wire harness length and the like are reduced to a certain extent. Therefore, the technical scheme provided by the embodiment of the invention can simplify the circuit structure and reduce the safety risk of the battery system to a certain extent.
In a sixth aspect, an embodiment of the present invention provides a high voltage detection circuit, including:
the first end of the charging and discharging assembly is connected with an outer contact of the negative terminal relay;
the charging assembly is connected with the second end of the charging and discharging assembly and is used for charging the charging and discharging assembly through the second end of the charging and discharging assembly;
the sampling assembly is connected with the second end of the charging and discharging assembly and is used for sampling the second end of the charging and discharging assembly to obtain a sampling result;
and the processing assembly is connected with the sampling assembly and is used for detecting the working state of the negative terminal relay according to the sampling result.
In the aspect and any possible implementation manner described above, there is further provided an implementation manner, where the charging and discharging component is a capacitor.
Aspects and any one of the possible implementations as described above, further provide an implementation, the charging assembly includes:
the first end of the first switch is connected with a power supply, and the second end of the first switch is connected with the second end of the charging and discharging assembly.
Aspects and any one of the possible implementations as described above, further provide an implementation, the charging assembly further includes:
And the current limiting assembly is connected between the second end of the first switch and the second end of the charging and discharging assembly.
Aspects and any one of the possible implementations as described above, further provide an implementation, the current limiting assembly includes: at least one of a resistor and a resistor array.
Aspects and any one of the possible implementations as described above, further provide an implementation, the sampling assembly includes:
the first end of the first voltage dividing component is connected with the second end of the charging and discharging component;
the first end of the second voltage division component is connected with the second end of the first voltage division component and the first end of the processing component, and the second end of the second voltage division component is grounded.
Aspects and any one of the possible implementations as described above, further provide an implementation, the sampling assembly further includes:
the second switch is connected between the first end of the first voltage dividing component and the second end of the charging and discharging component.
Aspects and any one of the possible implementations as described above, further provides an implementation,
the first voltage dividing assembly includes: at least one resistor; and/or at least one resistor array;
The second voltage dividing assembly includes: at least one resistor; and/or at least one resistor array.
Aspects and any possible implementation manner as described above, further provide an implementation manner, where the high voltage detection circuit further includes:
the first end of the current detection component is connected with the negative electrode of the battery module, the second end of the current detection component is connected with the inner side contact of the negative terminal relay, and the third end and the fourth end of the current detection component are connected to the processing component.
Aspects and any one of the possible implementations as described above, further provide an implementation, the current detection assembly includes:
a shunt provided with a built-in resistor;
the first end of the shunt is connected with the negative electrode of the battery module;
the second end of the shunt is connected with the inner side contact of the negative terminal relay;
both ends of the built-in resistor of the shunt are connected to the processing assembly.
Aspects and any possible implementation manner as described above, further provide an implementation manner, where the high voltage detection circuit further includes:
the temperature sensing assembly is arranged at the outer side of the shunt and is in contact with the built-in resistor of the shunt, and the temperature sensing assembly is connected with the processing assembly.
In aspects and any one of the possible implementations described above, there is further provided an implementation, the temperature sensing component is a thermistor.
Aspects and any possible implementation manner as described above, further provide an implementation manner, where the high voltage detection circuit further includes:
and the isolation belt is arranged in the edge area of the processing assembly connected with the low-voltage loop.
The power supply assembly is arranged on two sides of the isolation belt, a first end of the power supply assembly is connected with the processing assembly, and a second end of the power supply assembly is connected with power supply equipment;
the communication assembly is arranged on two sides of the isolation belt, a first end of the communication assembly is connected with the processing assembly, and a second end of the communication assembly is connected with the main control system.
In the aspects and any possible implementation manner as described above, there is further provided an implementation manner, where the power supply component is a transformer.
Aspects and any one of the possible implementations as described above, further provide an implementation, where the communication component is an isolated chip.
In a seventh aspect, an embodiment of the present invention provides a circuit board, including: a high voltage detection circuit of any of the above implementations.
In an eighth aspect, an embodiment of the present application provides a detector, including: a high voltage detection circuit of any of the above implementations.
In a ninth aspect, an embodiment of the present application provides a battery system including:
a battery module;
a negative side relay;
the high-voltage detection circuit of any one of the above implementation modes is connected between the battery module and the negative terminal relay.
In a tenth aspect, embodiments of the present application provide a vehicle comprising: a high voltage detection circuit of any of the above implementations.
One of the above technical solutions has the following beneficial effects:
compared with the scheme that the high-voltage detection circuit needs to be connected to two sides of a negative terminal relay and diagnosis is achieved on the negative terminal relay through collected voltage signals in the prior art, the high-voltage detection circuit provided by the embodiment of the application only needs to be connected with an outer contact of the negative terminal relay, unnecessary wire harness connection is simplified, the number and length of wire harnesses in a battery system are reduced, the complexity of the total circuit can be reduced to a certain extent, safety risks caused by more wiring harnesses are avoided, and the flexibility and safety of the whole circuit are improved. In addition, the high-voltage detection circuit can be directly arranged in a high-voltage loop connected with the battery module, so that the problem of arranging an isolation device in a low-voltage loop in an integrated manner can be avoided. Therefore, the technical scheme provided by the embodiment of the application can simplify the circuit structure and reduce the safety risk of the battery system to a certain extent.
In an eleventh aspect, an embodiment of the present invention provides a high voltage detection method, applied to the high voltage detection circuit, implemented in a processing component, where the method includes:
closing the first switch in response to receiving a relay detection instruction;
opening the first switch when the capacitor is fully charged;
in the discharging process of the capacitor, at least two voltage signals are obtained through the end points of the processing component, which are connected with the second resistor and the third resistor;
according to the acquired voltage signal, acquiring a discharge capacity value of the capacitor;
and detecting whether the negative terminal relay has faults or not according to the discharge capacity value, the actual capacity value of the capacitor and the working state of the negative terminal relay.
In a twelfth aspect, an embodiment of the present invention provides a computer-readable storage medium, including: computer-executable instructions that, when executed, perform the steps of:
closing the first switch in response to receiving a relay detection instruction;
opening the first switch when the capacitor is fully charged;
in the discharging process of the capacitor, at least two voltage signals are obtained through the end points of the processing component, which are connected with the second resistor and the third resistor;
According to the acquired voltage signal, acquiring a discharge capacity value of the capacitor;
and detecting whether the negative terminal relay has faults or not according to the discharge capacity value, the actual capacity value of the capacitor and the working state of the negative terminal relay.
One of the above technical solutions has the following beneficial effects:
according to the high-voltage detection method provided by the embodiment of the invention, based on the high-voltage detection circuit, after receiving the relay detection instruction, the capacitor is charged, and the voltage signal is acquired in the discharging process after the capacitor is fully charged, so that the discharging value of the capacitor can be acquired according to the discharging formula and the partial pressure processing formula of the capacitor voltage, if the discharging value is the same as the actual capacitance value of the capacitor, the negative-terminal relay is theoretically in a conducting state, if the discharging value is larger than the actual capacitance value of the capacitor, the negative-terminal relay is theoretically in a disconnecting state, and therefore, according to the actual working state and the theoretical state of the negative-terminal relay, whether the negative-terminal relay fails or not can be detected.
In a thirteenth aspect, an embodiment of the present invention provides a high voltage detection method, applied to the high voltage detection circuit, implemented in a processing component, where the method includes:
in response to receiving a relay detection instruction, turning on the charging assembly;
when the charging and discharging assembly is fully charged, the charging assembly is disconnected and the sampling assembly is connected;
during the discharging process of the charging and discharging assembly, at least two voltage signals are obtained by utilizing the sampling assembly;
according to the acquired voltage signals, acquiring discharge capacity values of the charge-discharge assembly;
and detecting whether the negative terminal relay fails according to the discharge capacity value, the actual capacity value of the charge-discharge assembly and the working state of the negative terminal relay.
In accordance with aspects and any possible implementation manner of the foregoing, there is further provided an implementation manner, detecting whether the negative side relay is faulty according to the discharge capacity value, an actual capacity value of the charge-discharge assembly, and an operation state of the negative side relay, including:
obtaining an error value between the discharge capacity value and the actual capacity value;
comparing the error value with a preset threshold value to obtain a comparison result;
And detecting whether the negative terminal relay fails or not according to the comparison result and the working state of the negative terminal relay.
In the aspect and any possible implementation manner described above, there is further provided an implementation manner, detecting whether the negative terminal relay is faulty according to the comparison result and the working state of the negative terminal relay, including:
detecting that the negative side relay is normal when the negative side relay is in a conducting state and the error value is smaller than or equal to the threshold value; or alternatively, the process may be performed,
detecting that the negative terminal relay has an open circuit fault when the negative terminal relay is in a conducting state and the error value is greater than the threshold value; or alternatively, the process may be performed,
detecting that the negative terminal relay has adhesion failure when the negative terminal relay is in an off state and the error value is smaller than or equal to the threshold value; or alternatively, the process may be performed,
and detecting that the negative terminal relay is normal when the negative terminal relay is in an off state and the error value is greater than the threshold value.
In the aspect and any possible implementation manner described above, there is further provided an implementation manner, according to the collected voltage signal, a discharge capacity value of the charge-discharge assembly is obtained, including:
And processing the at least two voltage signals by using a discharge formula and a voltage division formula of the charge-discharge assembly to obtain a calculated capacitance value of the charge-discharge assembly.
In a fourteenth aspect, an embodiment of the present invention provides a computer-readable storage medium, including: computer-executable instructions that, when executed, perform the steps of:
in response to receiving a relay detection instruction, turning on the charging assembly and starting timing;
when the charging time length reaches a preset time length, disconnecting the charging assembly and switching on the sampling assembly;
during the discharging process of the charging and discharging assembly, at least two voltage signals are obtained by utilizing the sampling assembly;
according to the acquired voltage signals, acquiring discharge capacity values of the charge-discharge assembly;
based on the discharge capacity, the actual capacity of the charge-discharge assembly, and the negative side relay
And in a working state, detecting whether the negative terminal relay fails.
One of the above technical solutions has the following beneficial effects:
according to the high-voltage detection method provided by the embodiment of the invention, the high-voltage detection circuit is based on the realization that the charging and discharging assembly is charged after receiving the relay detection instruction, and the voltage signal is collected in the discharging process after the charging and discharging assembly is fully charged, so that the discharging value of the charging and discharging assembly can be obtained according to the discharging formula and the partial pressure processing formula of the capacitor voltage, if the discharging value is the same as the actual capacitance value of the capacitor, the negative-terminal relay is theoretically in a conducting state, if the discharging value is larger than the actual capacitance value of the capacitor, the negative-terminal relay is theoretically in a disconnecting state, and therefore, the detection on whether the negative-terminal relay fails or not can be realized according to the actual working state and the theoretical state of the negative-terminal relay.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a first embodiment of a high voltage detection circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a second embodiment of a high voltage detection circuit according to an embodiment of the present invention;
fig. 3 is a flowchart of a high voltage detection method when the high voltage detection circuit shown in fig. 2 performs relay detection;
fig. 4 is a schematic structural diagram of a first embodiment of a circuit board according to an embodiment of the present invention;
FIG. 5 is a schematic view of a first embodiment of a detector according to an embodiment of the present invention;
fig. 6 is a schematic structural view of a first embodiment of a battery system according to an embodiment of the present invention;
FIG. 7 is a schematic view of a first embodiment of a vehicle according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a third embodiment of a high voltage detection circuit according to an embodiment of the present invention;
Fig. 9 is a schematic structural diagram of a fourth embodiment of a high voltage detection circuit according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a fifth embodiment of the high voltage detection circuit according to the present invention;
fig. 11 is a schematic structural diagram of a sixth embodiment of a high voltage detection circuit according to the present invention;
fig. 12 is a flowchart of a high voltage detection method when the high voltage detection circuit shown in fig. 8 to 11 performs relay detection;
fig. 13 is a schematic structural diagram of a second embodiment of a circuit board according to an embodiment of the present invention;
FIG. 14 is a schematic diagram of a second embodiment of a detector according to an embodiment of the present invention;
fig. 15 is a schematic structural view of a second embodiment of a battery system according to an embodiment of the present invention;
fig. 16 is a schematic structural view of a second embodiment of a vehicle according to an embodiment of the present invention.
[ detailed description ] of the invention
For a better understanding of the technical solution of the present invention, the following detailed description of the embodiments of the present invention refers to the accompanying drawings.
It should be understood that the described embodiments are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. 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 be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used in embodiments of the present invention to describe switches, etc., these switches should not be limited to these terms. These terms are only used to distinguish the switches from each other. For example, a first switch may also be referred to as a second switch, and similarly, a second switch may also be referred to as a first switch, without departing from the scope of embodiments of the present invention.
Depending on the context, the word "if" as used herein may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to detection". Similarly, the phrase "if determined" or "if detected (stated condition or event)" may be interpreted as "when determined" or "in response to determination" or "when detected (stated condition or event)" or "in response to detection (stated condition or event), depending on the context.
Aiming at the problems that a high-voltage detection circuit of a relay is integrated in a BMS (battery management system) to cause complex circuit structure and safety risk in the prior art, the embodiment of the invention provides the following solution thinking: the relay detection sub-circuit is arranged in the high-voltage loop, and the detection on whether the relay is in fault or not is realized by utilizing the processing component which is arranged in the high-voltage loop and is applicable to the detector in the high-voltage environment, so that the problems of complex structure and safety risk caused by the arrangement of the isolation device between the BMS and the relay detection sub-circuit can be avoided, the cost is reduced, and the safety performance of the whole battery system is improved.
Guided by this idea, this solution example provides the following possible implementation.
Example 1
The embodiment of the invention provides a high-voltage detection circuit and method, a detector, a battery system, a carrier and a computer readable storage medium.
First, please refer to fig. 1, which is a schematic diagram of a first embodiment of a high voltage detection circuit according to an embodiment of the present invention, as shown in fig. 1, the high voltage detection circuit 100 is connected between a battery module 102 and a negative terminal relay 101, and includes:
a relay detection sub-circuit 11, a first end of the relay detection sub-circuit 11 being connected to an OUTSIDE contact (hvmain_outside) of the negative terminal relay 101;
The processing component 12, the processing component 12 is connected with the second end of the relay detection sub-circuit 11;
the first end of the current detection sub-circuit 13 is connected with the negative electrode (B-) of the battery module 102, the second end of the current detection sub-circuit 13 is connected with the inner side contact (HVMAIN_INSIDE) of the negative terminal relay 101, and the current detection sub-circuit 13 is also connected to the processing component 12.
In the embodiment of the invention, the outer contact of the relay represents the contact of the relay at the side far away from the battery module, and the inner contact of the relay represents the contact of the relay at the side close to the battery module.
As shown in fig. 1, a high voltage detection circuit 100 is connected between the negative electrode (B-) of the battery module 102 and the negative terminal relay 101, and the other ends of the positive and negative terminal relays of the battery module 102 may also be connected through other electrical devices, such as a load, a main positive relay, etc., to form a complete circuit, and the connection relationship of this portion is not particularly limited in the embodiment of the present invention, and therefore is indicated as … in fig. 1.
As shown in fig. 1, a battery module 102 and a negative terminal relay 101 on a main circuit are both disposed in a high-voltage circuit, and a high-voltage detection circuit 100 provided in the embodiment of the invention is disposed between the battery module 102 and the negative terminal relay 101, and meanwhile, a relay detection sub-circuit 11 and a current detection sub-circuit 13 in the high-voltage detection circuit 100 are both connected with a processing component 12, and a current detection function on the main circuit and a detection function on whether the negative terminal relay is faulty are realized through the processing of the processing component 12. In this way, the relay detection sub-circuit 11 is arranged in the high-voltage loop, so that the problems of complex circuit structure and high cost caused by the fact that the relay detection sub-circuit is integrated in the BMS and an isolation component is required to be arranged are avoided; in addition, as shown in fig. 1, the relay detection sub-circuit 11 can be realized by using the processing component 12 existing in the detector, and no additional processing chip or processing component is needed, so that the circuit cost is further reduced, and the circuit structure is simplified; based on simplification of the circuit structure, the number and the length of the wire harnesses in the battery system are shortened, and the safety risks caused by complex circuit structure, more wire harnesses, longer wire harness length and the like are reduced to a certain extent.
In a specific implementation process, please refer to fig. 2, which is a schematic structural diagram of a second embodiment of a high voltage detection circuit according to an embodiment of the present invention, as shown in fig. 2, including:
a capacitor 111, a first end of the capacitor 111 being connected to an OUTSIDE contact (hvmain_outside) of the negative side relay 101;
a first resistor 112, a first end of the first resistor 112 is connected to a second end of the capacitor 111;
the first switch 113, the first end of the first switch 113 is connected with the second end of the first resistor 112, the second end of the first switch 113 is connected with the power supply 103;
a second resistor 114, a first end of the second resistor 114 being connected to a second end of the capacitor 111;
the first end of the third resistor 115 is connected to the second end of the second resistor 114 and the processing assembly 12, and the second end of the third resistor 115 is grounded (GND in fig. 2).
In the high voltage detection circuit shown in fig. 2, the power supply 103 is a power supply source or a power supply device that can supply electric energy, for example, a constant voltage source, a constant current source, a direct current source, a battery, an energy storage system, and the like, which is not particularly limited in the embodiment of the present invention.
In the embodiment of the present invention, the high voltage detection circuit as shown in fig. 1 or fig. 2 may be integrated in a detector in the high voltage loop, where the processing component 12 is a micro control unit (Microcontroller Unit, MCU) in the detector.
Thus, in another specific implementation, as shown in fig. 2, the current detection subcircuit 13 includes:
shunt 131 provided with built-in resistor 1301;
a first end of the shunt 131 is connected with the negative electrode (B-) of the battery module 102;
a second end of the shunt 131 is connected to an INSIDE contact (hvmain_inside) of the negative side relay 101;
both ends of the shunt's built-in resistor 1301 are connected to the processing assembly 12.
Based on the high voltage detection circuit shown in fig. 2, when receiving a current detection instruction, the processing component 12 may acquire the current value of the main loop by acquiring the voltage across the built-in resistor 1301 of the shunt, thereby obtaining the current value of the main loop according to the resistance value of the built-in resistor 1301 of the shunt.
Specifically, the method of the processing component 12 obtaining the current value of the main loop may be expressed as:
wherein I represents main loop current, R 0 The resistance value of the built-in resistor 1301 of the shunt, U SP1 A voltage value of a current input terminal of a built-in resistor 1301 of the shunt, U SP2 The voltage value at the current output of the shunt's built-in resistor 1301 is shown.
Referring to fig. 3, fig. 3 is a flow chart of a high voltage detection method when the high voltage detection circuit shown in fig. 2 performs relay detection. Specifically, as shown in fig. 3, the high voltage detection method includes:
S301, in response to receiving the relay detection instruction, closes the first switch 113.
In the embodiment of the present invention, when the first switch 113 is turned on, the current flows from the power supply 103 to the negative electrode of the battery module 102 through the first switch 113, the first resistor 112, the capacitor 111, and the negative relay 101, thereby forming a complete charging circuit. At this time, the power supply 103 may charge the capacitor 111 through the closed first switch 113.
S302, when the capacitor 111 is fully charged, the first switch 113 is turned off.
In the embodiment of the present invention, the charging process of the capacitor 111 is timed, so that when the charging duration reaches the preset duration, the capacitor 111 is considered to be in a fully charged state.
At this time, the first switch 113 is turned off, and the capacitor 111 starts to discharge.
S303, during the discharging process of the capacitor 111, at least two voltage signals are obtained through the terminals of the processing component 12 connected with the second resistor 114 and the third resistor 115.
The embodiment of the invention has no special limitation on the number of the acquired voltage signals and the acquisition frequency. The more the number of acquired voltage signals, the more accurate the final detection result.
S304, according to the acquired voltage signal, the discharge capacity value of the capacitor 111 is acquired.
Specifically, when this step is performed, the collected voltage signal may be processed using a discharge equation and a voltage division equation of the capacitor, to obtain a discharge capacity value of the capacitor 111 during the discharge process.
S305, detecting whether the negative side relay 101 is malfunctioning based on the discharge capacity value, the actual capacity value of the capacitor 111, and the operation state of the negative side relay 101.
Based on the obtained discharge capacity value, an error value between the discharge capacity value of the capacitor 111 and the actual capacity value can be obtained, and the error value is compared with a preset threshold value to obtain a comparison result, so that whether the negative-side relay 101 fails or not is detected according to the comparison result and the working state of the negative-side relay 101. At this time, there are four cases:
first, when the negative side relay 101 is in the on state and the error value is less than or equal to a preset threshold value, the negative side relay 101 is detected to be normal.
At this time, the error value is smaller than or equal to the preset threshold value, which indicates that the discharge capacity value of the capacitor 111 in the discharging process is close to the actual capacity value, and the capacitor 111 in the charging process is in a normal charging state, so that the discharge capacity value of the capacitor 111 in the discharging process is close to the actual capacity value, and the negative terminal relay 101 is necessarily in a conducting state, so that the capacitor 111 can be normally charged, that is, according to the comparison result between the error value and the preset threshold value, the negative terminal relay 101 can be determined to be in the conducting state at this time; the negative side relay 101 is also actually in a conductive state, indicating that the negative side relay 101 is normal.
Second, when the negative side relay 101 is in a conductive state and the error value is greater than a preset threshold value, an open circuit fault of the negative side relay 101 is detected.
At this time, the error value is greater than the preset threshold, which indicates that the difference between the discharge capacity value of the capacitor 111 in the discharge process and the actual capacity value is greater, and that the discharge capacity value of the capacitor 111 in the discharge process is greater than the actual capacity value only when the capacitor 111 is not normally charged in the charging process, at this time, the negative terminal relay 101 is necessarily in the off state, so that the capacitor 111 cannot be normally charged, that is, according to the comparison result between the error value and the preset threshold, it can be determined that the negative terminal relay 101 is in the off state at this time; while the negative side relay 101 is actually in a conductive state, indicating that the negative side relay 101 has failed open.
Third, when the negative side relay 101 is in an off state and the error value is less than or equal to a preset threshold, it is detected that the negative side relay 101 has a stuck fault.
At this time, the error value is smaller than or equal to the preset threshold value, which indicates that the discharge capacity value of the capacitor 111 in the discharging process is close to the actual capacity value, and the capacitor 111 in the charging process is in a normal charging state, so that the discharge capacity value of the capacitor 111 in the discharging process is close to the actual capacity value, and the negative terminal relay 101 is necessarily in a conducting state, so that the capacitor 111 can be normally charged, that is, according to the comparison result between the error value and the preset threshold value, the negative terminal relay 101 can be determined to be in the conducting state at this time; while the negative side relay 101 is actually in an open state, indicating that the negative side relay 101 has stuck.
Fourth, when the negative side relay 101 is in the off state and the error value is greater than a preset threshold, the negative side relay 101 is detected to be normal.
At this time, the error value is greater than the preset threshold, which indicates that the difference between the discharge capacity value of the capacitor 111 in the discharge process and the actual capacity value is greater, and that the discharge capacity value of the capacitor 111 in the discharge process is greater than the actual capacity value only when the capacitor 111 is not normally charged in the charging process, at this time, the negative terminal relay 101 is necessarily in the off state, so that the capacitor 111 cannot be normally charged, that is, according to the comparison result between the error value and the preset threshold, it can be determined that the negative terminal relay 101 is in the off state at this time; the negative side relay 101 is also actually in an open state, indicating that the negative side relay 101 is normal.
Based on the above high voltage detection method, an embodiment of the present invention further provides a computer readable storage medium, including: computer executable instructions that when executed perform the high voltage detection method of any of the implementations described above.
Based on the high-voltage detection circuit and the high-voltage detection method, the embodiment of the invention also provides a circuit board.
Referring to fig. 4, which is a schematic structural diagram of a first embodiment of a circuit board according to an embodiment of the present invention, as shown in fig. 4, the circuit board 400 includes: the high voltage detection circuit 100 obtained in any of the above implementations.
Based on the high-voltage detection circuit and the high-voltage detection method, the embodiment of the invention also provides a detector.
Referring to fig. 5, which is a schematic structural diagram of a first embodiment of a detector according to an embodiment of the present invention, as shown in fig. 5, the detector 500 includes: the high voltage detection circuit 100 obtained in any of the above implementations.
Based on the high-voltage detection circuit and the high-voltage detection method, the embodiment of the invention also provides a battery system.
Referring to fig. 6, which is a schematic structural diagram of a first embodiment of a battery system according to an embodiment of the invention, as shown in fig. 6, the battery system 600 includes:
a battery module 102;
a negative terminal relay 101;
the high voltage detection circuit 100 obtained in any of the above implementations, the high voltage detection circuit 100 is connected between the battery module 102 and the negative terminal relay 101.
Based on the high-voltage detection circuit and the high-voltage detection method, the embodiment of the invention also provides a carrier.
Referring to fig. 7, which is a schematic structural diagram of a first embodiment of a vehicle according to an embodiment of the invention, as shown in fig. 7, the vehicle 700 includes: the high voltage detection circuit 100 obtained in any of the above implementations.
In a specific implementation, the vehicle 700 shown in fig. 7 is an electric vehicle.
The technical scheme of the embodiment of the invention has the following beneficial effects:
on the one hand, in the embodiment of the invention, the battery module and the negative terminal relay on the main circuit are both arranged in the high-voltage circuit, the high-voltage detection circuit provided by the embodiment of the invention is arranged between the battery module and the negative terminal relay, and meanwhile, the relay detection sub-circuit and the current detection sub-circuit in the high-voltage detection circuit are both connected with the processing assembly, and the current detection function of the main circuit and the detection function of whether the negative terminal relay is in fault or not are realized through the processing of the processing assembly. Thus, the relay detection subcircuit is arranged in the high-voltage loop, and the problems of complex circuit structure and higher cost caused by the fact that the relay detection subcircuit is integrated in the BMS and an isolation component is required to be arranged are avoided; in addition, in the embodiment of the invention, the relay detection subcircuit can be realized by utilizing the processing component existing in the detector, and no additional processing chip or processing component is needed, so that the circuit cost is further reduced, and the circuit structure is simplified; based on simplification of the circuit structure, the number and the length of the wire harnesses in the battery system are shortened, and the safety risks caused by complex circuit structure, more wire harnesses, longer wire harness length and the like are reduced to a certain extent. Therefore, the technical scheme provided by the embodiment of the invention can simplify the circuit structure and reduce the safety risk of the battery system to a certain extent.
On the other hand, the high voltage detection method provided by the embodiment of the invention can acquire the voltage signal in the discharging process after receiving the relay detection instruction by charging the capacitor and fully charging the capacitor based on the high voltage detection circuit, so that the discharging value of the capacitor can be acquired according to the discharging formula and the partial pressure processing formula of the capacitor voltage, if the discharging value is the same as the actual capacitance value of the capacitor, the negative terminal relay is theoretically in a conducting state, if the discharging value is different from the actual capacitance value of the capacitor, the negative terminal relay is theoretically in a disconnecting state, so that the detection on whether the negative terminal relay has faults or not can be realized according to the actual working state and the theoretical state of the negative terminal relay.
Example two
The embodiment of the invention provides a high-voltage detection circuit and method, a detector, a battery system, a carrier and a computer readable storage medium.
First, please refer to fig. 8, which is a schematic diagram of a third embodiment of a high voltage detection circuit according to an embodiment of the present application, as shown in fig. 8, the high voltage detection circuit 800 includes:
a charge-discharge assembly 81, a first end of the charge-discharge assembly 81 being connected to an OUTSIDE contact (hvmain_outside) of the negative side relay 101;
the charging assembly 82 is connected with the second end of the charging and discharging assembly 81, and is used for charging the charging and discharging assembly 81 through the second end of the charging and discharging assembly 81;
the sampling assembly 83, the sampling assembly 83 is connected with the second end of the charging and discharging assembly 81, and is used for sampling the second end of the charging and discharging assembly 81 to obtain a sampling result;
the processing component 84 is connected to the sampling component 83, and is configured to detect an operating state of the negative side relay 101 according to a sampling result.
Compared with the scheme that the high-voltage detection circuit needs to be connected to two sides of a negative terminal relay and diagnosis is achieved on the negative terminal relay through collected voltage signals in the prior art, the high-voltage detection circuit provided by the embodiment of the application only needs to be connected with an outer contact of the negative terminal relay, unnecessary wire harness connection is simplified, the number and length of wire harnesses in a battery system are reduced, the complexity of the total circuit can be reduced to a certain extent, safety risks caused by more wiring harnesses are avoided, and the flexibility and safety of the whole circuit are improved. In addition, the high-voltage detection circuit can be directly arranged in a high-voltage loop connected with the battery module, so that the problem of arranging an isolation device in a low-voltage loop in an integrated manner can be avoided. Therefore, the technical scheme provided by the embodiment of the application can simplify the circuit structure and reduce the safety risk of the battery system to a certain extent.
The following describes each component in the high voltage detection circuit 800 shown in fig. 8.
In the embodiment of the present invention, the charge and discharge assembly 81 shown in fig. 8 is an electric device that can be charged and discharged.
In a specific implementation process of the scheme, the charging assembly 82 is used for charging the charging and discharging assembly 81, and in a charging process, it is required to ensure that the charging voltage of the charging and discharging assembly 81 is less than or equal to the maximum bearable voltage of the charging and discharging assembly 81. In this way, the charging and discharging assembly 81 can work normally, so that the condition that the charging and discharging assembly 81 is burnt out due to overlarge charging voltage is avoided, and the problem that sampling data are inaccurate possibly caused is avoided.
In a specific implementation process, the charging and discharging component according to the embodiment of the present invention may be a capacitor.
In a specific implementation process, please refer to fig. 9, which is a schematic diagram of a fourth embodiment of a high voltage detection circuit according to an embodiment of the present invention. In the high voltage detection circuit 800 shown in fig. 9, the charge-discharge assembly 81 is represented as a capacitor, and the first end of the charge-discharge assembly 81 is connected to the OUTSIDE contact (hvmain_outside) of the negative terminal relay 101, and the second end is connected to the charge assembly 82 and the sampling assembly 83, respectively.
In the high voltage detection circuit 800 shown in fig. 9, the charging assembly 82 includes:
the first switch 821 has a first end connected to the power supply 103, and a second end connected to the second end of the charge/discharge unit 81.
In the high voltage detection circuit shown in fig. 9, the power supply 103 is a power supply source or a power supply device that can supply electric energy, for example, a constant voltage source, a constant current source, a direct current source, a battery, an energy storage system, and the like, and the embodiment of the present invention is not particularly limited.
In this way, the power supply 103 can charge the charge and discharge assembly 81 only by closing the first switch 821 in the process of charging the charge and discharge assembly 81.
In a specific implementation, considering that the power supply 103 may provide a larger current, which is not matched with the sustainable current of the charging and discharging assembly 81, in order to further ensure the safety performance of the charging and discharging assembly 81, as shown in fig. 9, in the high voltage detection circuit 800, the charging assembly 82 may further include:
the current limiting component 822 is connected between the second end of the first switch 821 and the second end of the charge-discharge component 81.
The current limiting assembly is used for limiting the power supply current of the charging assembly. In a practical application scenario, the flow restricting assembly may include, but is not limited to: at least one of a resistor and a resistor array.
When a single resistor is used as the current limiting component, the circuit structure can be simplified, thereby avoiding the safety problem caused by the complex circuit structure. Specifically, the embodiment of the present invention is not particularly limited to the expression form of the resistor, and for example, the resistor may include, but is not limited to: at least one of the column resistor and the chip resistor. The chip resistor is small in size, so that the circuit structure can be further simplified.
The number of resistors included in the resistor array is at least two, and when the resistor array is used as a current limiting component, the connection mode of each resistor unit in the resistor array is not particularly limited in the embodiment of the invention. For example, the resistor units can be connected in parallel, so that even if part of the resistor units fail, the charging function of the whole charging assembly is not greatly affected, and the safety performance and the service life of the whole circuit are improved to a certain extent. Likewise, the resistor array may include, but is not limited to: at least one of a column resistor array and a chip resistor array.
In the high voltage detection circuit 800 shown in fig. 9, the sampling component 83 includes:
the first end of the first voltage dividing component 831 is connected with the second end of the charge and discharge component 81;
The second voltage dividing component 832, the first end of the second voltage dividing component 832 is connected to the second end of the first voltage dividing component 831 and the first end of the processing component 84, and the second end of the second voltage dividing component 832 is grounded (GND in fig. 9).
In one specific application scenario, the first voltage dividing component may include: at least one resistor; and/or at least one resistor array.
In another specific application scenario, the second voltage dividing component may include: at least one resistor; and/or at least one resistor array.
Thus, as shown in fig. 9, the first end of the processing component 84 may collect the voltage signal at the node connected between the first voltage dividing component 831 and the second voltage dividing component 832 in the sampling component 83, and since the second voltage dividing component 832 is grounded, that is, the voltage value of the second voltage dividing component 832 is collected by the first end of the processing component 84 connected to the sampling component 83.
In a specific implementation, as shown in fig. 9, when the first switch 821 is closed, the charge-discharge assembly 81 is charged, and in this process, the sampling assembly 83 may transmit, through a connection relationship with the processing assembly 84, sampling data to the processing assembly 84, where the sampling data is useless data in a process of performing relay detection, so as to avoid resource waste caused by collecting the useless data on the processing assembly 84, and therefore, a second switch may be further disposed in the sampling assembly.
At this time, referring to fig. 9, in the high voltage detection circuit 800 shown in fig. 9, the sampling component 83 further includes:
the second switch 833 is connected between the first end of the first voltage dividing component 831 and the second end of the charge and discharge component 81.
Thus, as shown in fig. 9, when the first switch 821 is closed, the second switch 833 is only opened, so that the processing component 84 can be prevented from collecting useless data in the charging process of the charging and discharging component 81; and when the charging process is finished and the charging and discharging assembly 81 is fully charged, the second switch 833 is closed, so that the processing assembly 84 can collect the effective data of the charging and discharging assembly 81 in the discharging process.
The high-voltage detection circuit provided by the embodiment of the invention is suitable for a high-voltage system and a low-voltage system. Considering the problems of complicated circuit structure and potential safety hazard existing in the prior art that the high voltage detection circuit is integrated in the BMS, the high voltage detection circuit can be disposed in the high voltage loop.
In view of further cost saving, the high voltage detection circuit can be arranged in the detector, so that a micro control unit which is self-adaptive to a high voltage environment in the detector can be used as a processing component in the embodiment of the invention to detect whether the relay is in fault.
At this time, reference may be made to fig. 10, which is a schematic structural diagram of a fifth embodiment of the high voltage detection circuit provided in the embodiment of the present invention, where the high voltage detection circuit 800 shown in fig. 10 includes, in addition to a full circuit portion of the high voltage detection circuit shown in fig. 9:
the first end of the current detection component 85 is connected with the negative electrode of the battery module 102, the second end of the current detection component 85 is connected with the inner side contact (hvmain_inside) of the negative terminal relay, and the third end and the fourth end of the current detection component 85 are both connected to the processing component 84.
As shown in fig. 10, in the high voltage detection circuit 800, a circuit for performing a relay detection function (including a charging/discharging unit 81, a charging unit 82, and a sampling unit 83) and a current detection unit 85 for performing a current detection function are connected to a processing unit 84, and the relay detection function and the current detection function are realized by performing data processing by the processing unit 84.
The specific structure of the current detection component 85 is not particularly limited in the embodiment of the present invention, and in the actual implementation process, a current divider, a hall sensor, and the like may be used as the current detection component to implement the current detection function.
To more specifically describe the scheme, an implementation mode of using a current divider as a current detection component is provided in the embodiment of the invention.
As shown in fig. 10, the current detecting element 85 in the high voltage detecting circuit 800 is a shunt 851 provided with a built-in resistor; wherein the first end of the shunt 851 is connected with the negative electrode (B-) of the battery module 102; a second end of the shunt 851 is connected to an INSIDE contact (hvmain_inside) of the negative side relay 101; both ends of the built-in resistor 8511 of the shunt are connected to the processing assembly 84.
Based on the high voltage detection circuit shown in fig. 10, when receiving a current detection instruction, the processing unit 84 can acquire the current value of the main loop by acquiring the voltage across the built-in resistor 8511 of the shunt, thereby obtaining the current value of the main loop according to the resistance value of the built-in resistor 8511 of the shunt.
Specifically, the method of the processing component 84 obtaining the current value of the main loop may be expressed as:
wherein I represents the main loop current, R represents the resistance value of the built-in resistor 8511 of the current divider, U SP3 The voltage value of the current input terminal of the built-in resistor 8511 of the shunt, U SP4 The voltage value at the current output terminal of the shunt built-in resistor 8511 is shown.
In the embodiment of the present invention, considering that when the current detecting component 85 is the current divider 851, the current divider 851 may have a problem of temperature rise, and when the temperature of the current divider 851 is high enough, the safety performance of the whole circuit may be adversely affected, so that a temperature sensing component may be further disposed in the current detecting component.
At this time, as shown in fig. 10, the current detection component in the high voltage detection circuit 800 further includes:
the temperature sensing component 852 is disposed outside the shunt 851 and is connected to the processing component 84 at a position contacting the built-in resistor 8511 of the shunt.
As such, through the connection between the temperature sensing component 852 and the processing component 84, the temperature sensing component 852 can transmit the collected temperature signals to the processing component 84, and the processing component 84 can further perform the safety protection processing according to the temperature signals.
In an embodiment of the invention, the temperature sensing component may be a thermistor (Negative Temperature Coefficient, NTC).
The processing component involved in the embodiment of the invention can be a micro control unit, namely a singlechip.
In a specific application process, the micro control unit in the high voltage detection circuit generally needs to be connected with a power supply so that the power supply can supply power to the micro control unit, and the micro control unit can work normally. However, the micro control unit is disposed in the high voltage circuit, and the high voltage detection circuit as shown in fig. 8 to 10 is disposed in the high voltage circuit as a whole, and a power supply for supplying power to the micro control unit is generally disposed in the low voltage circuit.
Therefore, an isolation strip may also be provided in the high voltage detection circuit provided in the embodiment of the present invention.
At this time, reference may be made to fig. 11, which is a schematic structural diagram of a sixth embodiment of a high voltage detection circuit according to an embodiment of the present invention, as shown in fig. 11, where the high voltage detection circuit 800 includes, in addition to the overall circuit shown in fig. 10:
the isolation belt 86 is provided at an edge region of the processing module 84 connected to the low-pressure circuit.
As shown in fig. 11, the high voltage detection circuit 800 further includes:
the power supply assembly 87, the first end of the power supply assembly 87 is connected with the processing assembly 84, and the second end of the power supply assembly 87 is connected with the power supply device 104.
When the high voltage detection circuit 800 shown in fig. 10 is provided with the isolation belt 86, the power supply unit 87 is provided on both sides of the isolation belt 86, and the isolation belt 86 is provided in an edge region where the high voltage detection circuit 800 is connected to the low voltage circuit.
In the embodiment of the present invention, considering that the power supply voltage of the power supply device in the low voltage loop may be different from the working voltage of the processing component, when the present scheme is implemented, the power supply component 87 in the high voltage detection circuit as shown in fig. 10 may be a transformer.
While when the high voltage detection circuit 800 shown in fig. 11 is applied to the field of electric vehicles, the power supply device 104 for supplying power to the processing component 84 may be a body power supply device of an electric vehicle.
In another specific implementation, the processing component is typically also required to communicate with other controllers or devices, and thus, a communication component is also required to be provided in the high voltage detection circuit.
At this time, as shown in fig. 11, the high voltage detection circuit 800 further includes:
the communication assembly 88, a first end of the communication assembly 88 is coupled to the processing assembly 84, and a second end of the communication assembly 88 is coupled to the overall control system 105.
When the high voltage detection circuit 800 shown in fig. 11 is provided with the isolation belt 86, the communication units 88 are provided on both sides of the isolation belt 86, and the isolation belt 86 is provided in an edge region where the high voltage detection circuit 800 is connected to the low voltage circuit.
In an embodiment of the present invention, as shown in fig. 11, the communication component 88 may be an isolated chip. The overall control system 105 may be an overall control system of an electric vehicle.
The high voltage detection method will be specifically described below based on the high voltage detection circuit 800 shown in fig. 8 to 11.
Please refer to fig. 12, which is a flowchart illustrating a high voltage detection method when the high voltage detection circuit shown in fig. 8-11 performs relay detection. As shown in fig. 12, the method may be applied to the high voltage detection circuit shown in fig. 8 to 11 and executed in the processing unit, and the method includes:
S1201, in response to receiving the relay detection instruction, the charging assembly 82 is turned on.
At this time, the charging assembly 82 charges the charging and discharging assembly 81.
As shown in fig. 9 to 11, when the charging assembly 82 is turned on in this step, only the first switch 821 is turned on.
S1202, when the charge and discharge assembly 81 is fully charged, the charge assembly 82 is disconnected and the sampling assembly 83 is turned on.
When this step is specifically implemented, the charging process of the charging and discharging assembly 81 may be timed, so that when the charging duration reaches the preset duration, the charging and discharging assembly 81 may be considered to be in a fully charged state.
Specifically, as shown in fig. 9 to 11, when the second switch 833 is not provided in the sampling module 83 of the high voltage detection circuit 800, the charging module 82 is turned off only by turning off the first switch 821.
Alternatively, when the second switch 833 is provided in the sampling assembly 83 in the high voltage detection circuit 800, the first switch 821 needs to be opened, and at the same time, the second switch 833 is closed.
S1203, during the discharging process of the charging and discharging assembly 81, at least two voltage signals are acquired by the sampling assembly 83.
In the embodiment of the present invention, during the discharging process of the charging and discharging component 81, the processing component 84 may collect the voltage signal at any at least two moments by connecting the terminal with the sampling component 83.
For example, the timing is started at the time when the charge/discharge unit 81 starts discharging, and at any three times t 1 、t 2 And t 3 Respectively carrying out signal acquisition to obtain three voltage signals: u (U) SP31 、U SP32 And U SP33 。
S1204, obtaining the discharge capacity value of the charge-discharge assembly 81 according to the collected voltage signal.
In the embodiment of the invention, the collected voltage signal can be processed by using the discharge formula and the voltage division formula of the charge-discharge assembly to obtain the calculated capacitance value of the charge-discharge assembly 81.
The following will specifically describe the step of obtaining the three voltage signals obtained at any time as an example:
at this time, according to the voltage equation and the resistance voltage division equation at the time of capacitor discharge, it is possible to obtain:
R＝R 831 +R 832
wherein U is SP31 T is the discharge process of the charge-discharge assembly 81 1 A voltage signal acquired at the moment; u (U) SP32 T is the discharge process of the charge-discharge assembly 81 2 A voltage signal acquired at the moment; u (U) SP33 T is the discharge process of the charge-discharge assembly 81 3 A voltage signal acquired at the moment; r is R 831 R is the resistance of the first voltage dividing component 831 832 Is the resistance of the second voltage dividing component 832, U 0 The charge voltage of the charge/discharge element 81, C is the capacitance of the charge/discharge element 81.
Based on the formula, the simultaneous equation set can be obtained by dividing the formula by each other:
Based on this, by solving the capacitance C, three solutions of the discharge capacity value C of the charge-discharge assembly 81 during the discharge process can be solved, as follows:
thus, the average value of the three solutions is obtained, and the discharge capacity value of the charge-discharge assembly 81 can be obtained:
wherein C is the discharge capacity of the charge-discharge assembly 81, C 1 、C 2 、C 3 The solution of the discharge capacity value of the charge-discharge assembly 81 during the discharge process.
S1205, detecting whether the negative side relay 101 is malfunctioning based on the discharge capacity value, the actual capacity value of the charge-discharge assembly 81, and the operating state of the negative side relay 101.
When this step is specifically performed, an error value between the discharge capacity value of the charge-discharge assembly 81 and the actual capacity value may be acquired; then, comparing the error value with a preset threshold value to obtain a comparison result; thus, based on the comparison result and the operation state of the negative side relay 101, it is detected whether or not the negative side relay 101 has failed.
At this time, there are four cases:
first, when the negative side relay 101 is in the on state and the error value is less than or equal to a preset threshold value, the negative side relay 101 is detected to be normal.
At this time, the error value is smaller than or equal to the preset threshold value, which indicates that the discharge capacity value of the capacitor 111 in the discharging process is close to the actual capacity value, and the capacitor 111 in the charging process is in a normal charging state, so that the discharge capacity value of the capacitor 111 in the discharging process is close to the actual capacity value, and the negative terminal relay 101 is necessarily in a conducting state, so that the capacitor 111 can be normally charged, that is, according to the comparison result between the error value and the preset threshold value, the negative terminal relay 101 can be determined to be in the conducting state at this time; the negative side relay 101 is also actually in a conductive state, indicating that the negative side relay 101 is normal.
Second, when the negative side relay 101 is in a conductive state and the error value is greater than a preset threshold value, an open circuit fault of the negative side relay 101 is detected.
At this time, the error value is greater than the preset threshold, which indicates that the difference between the discharge capacity value of the capacitor 111 in the discharge process and the actual capacity value is greater, and that the discharge capacity value of the capacitor 111 in the discharge process is greater than the actual capacity value only when the capacitor 111 is not normally charged in the charging process, at this time, the negative terminal relay 101 is necessarily in the off state, so that the capacitor 111 cannot be normally charged, that is, according to the comparison result between the error value and the preset threshold, it can be determined that the negative terminal relay 101 is in the off state at this time; while the negative side relay 101 is actually in a conductive state, indicating that the negative side relay 101 has failed open.
Third, when the negative side relay 101 is in an off state and the error value is less than or equal to a preset threshold, it is detected that the negative side relay 101 has a stuck fault.
At this time, the error value is smaller than or equal to the preset threshold value, which indicates that the discharge capacity value of the capacitor 111 in the discharging process is close to the actual capacity value, and the capacitor 111 in the charging process is in a normal charging state, so that the discharge capacity value of the capacitor 111 in the discharging process is close to the actual capacity value, and the negative terminal relay 101 is necessarily in a conducting state, so that the capacitor 111 can be normally charged, that is, according to the comparison result between the error value and the preset threshold value, the negative terminal relay 101 can be determined to be in the conducting state at this time; while the negative side relay 101 is actually in an open state, indicating that the negative side relay 101 has stuck.
Fourth, when the negative side relay 101 is in the off state and the error value is greater than a preset threshold, the negative side relay 101 is detected to be normal.
At this time, the error value is greater than the preset threshold, which indicates that the difference between the discharge capacity value of the capacitor 111 in the discharge process and the actual capacity value is greater, and that the discharge capacity value of the capacitor 111 in the discharge process is greater than the actual capacity value only when the capacitor 111 is not normally charged in the charging process, at this time, the negative terminal relay 101 is necessarily in the off state, so that the capacitor 111 cannot be normally charged, that is, according to the comparison result between the error value and the preset threshold, it can be determined that the negative terminal relay 101 is in the off state at this time; the negative side relay 101 is also actually in an open state, indicating that the negative side relay 101 is normal.
Based on the above high voltage detection method, an embodiment of the present invention further provides a computer readable storage medium, including: computer executable instructions that when executed perform the high voltage detection method of any of the implementations described above.
Based on the high-voltage detection circuit and the high-voltage detection method, the embodiment of the invention also provides a circuit board.
Referring to fig. 13, which is a schematic structural diagram of a second embodiment of a circuit board according to an embodiment of the present invention, as shown in fig. 13, the circuit board 1300 includes: the high voltage detection circuit 800 obtained in any of the above implementations.
Based on the high-voltage detection circuit and the high-voltage detection method, the embodiment of the invention also provides a detector.
Referring to fig. 14, which is a schematic structural diagram of a second embodiment of a detector according to an embodiment of the present invention, as shown in fig. 14, the detector 1400 includes: the high voltage detection circuit 800 obtained in any of the above implementations.
Based on the high-voltage detection circuit and the high-voltage detection method, the embodiment of the invention also provides a battery system.
Referring to fig. 15, which is a schematic structural diagram of a second embodiment of a battery system according to an embodiment of the present invention, as shown in fig. 15, the battery system 1500 includes:
a battery module 102;
a negative terminal relay 101;
the high voltage detection circuit 800 obtained in any of the above implementations, the high voltage detection circuit 800 being connected between the battery module 102 and the negative terminal relay 101.
Based on the high-voltage detection circuit and the high-voltage detection method, the embodiment of the invention also provides a carrier.
Referring to fig. 16, which is a schematic structural diagram of a second embodiment of a vehicle according to an embodiment of the application, as shown in fig. 16, the vehicle 1600 includes: the high voltage detection circuit 800 obtained in any of the above implementations.
In a specific implementation, the vehicle 1600 shown in fig. 16 is an electric vehicle.
The technical scheme of the embodiment of the application has the following beneficial effects:
on one hand, compared with the scheme that the high-voltage detection circuit is required to be connected to two sides of the negative terminal relay to diagnose the negative terminal relay through collected voltage signals in the prior art, the high-voltage detection circuit provided by the embodiment of the application only needs to be connected with the outer side contact of the negative terminal relay, so that unnecessary wire harness connection is simplified, the number and length of wire harnesses in a battery system are reduced, the complexity of the total circuit can be reduced to a certain extent, the safety risk caused by more wiring harnesses is avoided, and the flexibility and safety of the whole circuit are improved. In addition, the high-voltage detection circuit can be directly arranged in a high-voltage loop connected with the battery module, so that the problem of arranging an isolation device in a low-voltage loop in an integrated manner can be avoided. Therefore, the technical scheme provided by the embodiment of the application can simplify the circuit structure and reduce the safety risk of the battery system to a certain extent.
On the other hand, the high voltage detection method provided by the embodiment of the invention is realized based on the high voltage detection circuit, after receiving the relay detection instruction, the charging and discharging assembly is charged, and the voltage signal is collected in the discharging process after the charging and discharging assembly is fully charged, so that the discharge value of the charging and discharging assembly can be obtained according to the discharging formula and the partial pressure processing formula of the capacitor voltage, if the discharge value is the same as the actual capacitance value of the capacitor, the negative terminal relay is theoretically on, if the discharge value is larger than the actual capacitance value of the capacitor, the negative terminal relay is theoretically off, and if the discharge value is larger than the actual capacitance value, the negative terminal relay is theoretically off, so that the detection on whether the negative terminal relay fails can be realized according to the actual working state and the theoretical state of the negative terminal relay.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the invention.

Claims (22)

1. A high voltage detection circuit, characterized by, being connected between a battery module and a negative terminal relay, comprising:
a relay detection sub-circuit, a first end of which is connected with an outer contact of the negative terminal relay;
the processing component is connected with the second end of the relay detection sub-circuit;
the first end of the current detection sub-circuit is connected with the negative electrode of the battery module, the second end of the current detection sub-circuit is connected with the inner side contact of the relay, and the third end of the current detection sub-circuit is further connected to the processing assembly.
2. The high voltage detection circuit of claim 1, wherein the relay detection sub-circuit comprises:
the first end of the capacitor is connected with the outer contact of the negative terminal relay;
the first end of the first resistor is connected with the second end of the capacitor;
The first end of the first switch is connected with the second end of the first resistor, and the second end of the first switch is connected with a power supply;
the first end of the second resistor is connected with the second end of the capacitor;
and the first end of the third resistor is connected with the second end of the second resistor and the processing component, and the second end of the third resistor is grounded.
3. The high voltage detection circuit of claim 2, wherein the processing component is configured to:
closing the first switch in response to receiving a relay detection instruction;
opening the first switch when the capacitor is fully charged;
in the discharging process of the capacitor, at least two voltage signals are obtained through the end points of the processing component, which are connected with the second resistor and the third resistor;
according to the acquired voltage signal, acquiring a discharge capacity value of the capacitor;
and detecting whether the negative terminal relay has faults or not according to the discharge capacity value, the actual capacity value of the capacitor and the working state of the negative terminal relay.
4. The high voltage detection circuit of claim 1, wherein the current detection subcircuit comprises:
A shunt provided with a built-in resistor;
the first end of the shunt is connected with the negative electrode of the battery module;
the second end of the shunt is connected with the inner side contact of the negative terminal relay;
both ends of the built-in resistor of the shunt are connected to the processing assembly.
5. A high voltage detection circuit, comprising:
the first end of the charging and discharging assembly is connected with an outer contact of the negative terminal relay;
the charging assembly is connected with the second end of the charging and discharging assembly and is used for charging the charging and discharging assembly through the second end of the charging and discharging assembly;
the sampling assembly is connected with the second end of the charging and discharging assembly and is used for sampling the second end of the charging and discharging assembly to obtain a sampling result;
the processing assembly is connected with the sampling assembly and is used for detecting the working state of the negative terminal relay according to the sampling result;
the charging and discharging component is a capacitor;
the charging assembly includes:
the first end of the first switch is connected with a power supply, and the second end of the first switch is connected with the second end of the charging and discharging assembly.
6. The high voltage detection circuit of claim 5, wherein the charging assembly further comprises:
and the current limiting assembly is connected between the second end of the first switch and the second end of the charging and discharging assembly.
7. The high voltage detection circuit of claim 6, wherein the current limiting assembly comprises: at least one of a resistor and a resistor array.
8. The high voltage detection circuit of claim 5, wherein the sampling assembly comprises:
the first end of the first voltage dividing component is connected with the second end of the charging and discharging component;
the first end of the second voltage division component is connected with the second end of the first voltage division component and the first end of the processing component, and the second end of the second voltage division component is grounded.
9. The high voltage detection circuit of claim 8, wherein the sampling assembly further comprises:
the second switch is connected between the first end of the first voltage dividing component and the second end of the charging and discharging component.
10. The high voltage detection circuit of claim 8, wherein,
the first voltage dividing assembly includes: at least one resistor; and/or at least one resistor array;
The second voltage dividing assembly includes: at least one resistor; and/or at least one resistor array.
11. The high voltage detection circuit of claim 5, further comprising:
the first end of the current detection component is connected with the negative electrode of the battery module, the second end of the current detection component is connected with the inner side contact of the negative terminal relay, and the third end and the fourth end of the current detection component are connected to the processing component.
12. The high voltage detection circuit of claim 11, wherein the current detection assembly comprises:
a shunt provided with a built-in resistor;
the first end of the shunt is connected with the negative electrode of the battery module;
the second end of the shunt is connected with the inner side contact of the negative terminal relay;
both ends of the built-in resistor of the shunt are connected to the processing assembly.
13. The high voltage detection circuit of claim 5, further comprising:
the isolation belt is arranged in the edge area where the processing assembly is connected with the low-voltage loop;
the power supply assembly is arranged on two sides of the isolation belt, a first end of the power supply assembly is connected with the processing assembly, and a second end of the power supply assembly is connected with power supply equipment;
The communication assembly is arranged on two sides of the isolation belt, a first end of the communication assembly is connected with the processing assembly, and a second end of the communication assembly is connected with the main control system.
14. A detector, comprising: a high voltage detection circuit as claimed in any one of claims 1 to 13.
15. A battery system, comprising:
a battery module;
a negative side relay;
the high voltage detection circuit according to any one of claims 1 to 13, connected between the battery module and the negative terminal relay.
16. A vehicle, comprising: a high voltage detection circuit as claimed in any one of claims 1 to 13.
17. A high voltage detection method applied to the high voltage detection circuit of claim 2, implemented in the processing assembly, the method comprising:
closing the first switch in response to receiving a relay detection instruction;
opening the first switch when the capacitor is fully charged;
in the discharging process of the capacitor, at least two voltage signals are obtained through the end points of the processing component, which are connected with the second resistor and the third resistor;
According to the acquired voltage signal, acquiring a discharge capacity value of the capacitor;
and detecting whether the negative terminal relay has faults or not according to the discharge capacity value, the actual capacity value of the capacitor and the working state of the negative terminal relay.
18. A high voltage detection method, characterized in that it is applied to a high voltage detection circuit, the high voltage detection circuit comprising:
the first end of the charging and discharging assembly is connected with an outer contact of the negative terminal relay;
the charging assembly is connected with the second end of the charging and discharging assembly and is used for charging the charging and discharging assembly through the second end of the charging and discharging assembly;
the sampling assembly is connected with the second end of the charging and discharging assembly and is used for sampling the second end of the charging and discharging assembly to obtain a sampling result;
the processing component is connected with the sampling component and used for detecting the working state of the negative terminal relay according to the sampling result and executing the detection in the processing component;
the method comprises the following steps:
in response to receiving a relay detection instruction, turning on the charging assembly;
when the charging and discharging assembly is fully charged, the charging assembly is disconnected and the sampling assembly is connected;
During the discharging process of the charging and discharging assembly, at least two voltage signals are obtained by utilizing the sampling assembly;
according to the acquired voltage signals, acquiring discharge capacity values of the charge-discharge assembly;
and detecting whether the negative terminal relay fails according to the discharge capacity value, the actual capacity value of the charge-discharge assembly and the working state of the negative terminal relay.
19. The method of claim 18, wherein detecting whether the negative side relay is malfunctioning based on the discharge capacity value, an actual capacity value of the charge-discharge assembly, and an operating state of the negative side relay comprises:
obtaining an error value between the discharge capacity value and the actual capacity value;
comparing the error value with a preset threshold value to obtain a comparison result;
and detecting whether the negative terminal relay fails or not according to the comparison result and the working state of the negative terminal relay.
20. The method of claim 19, wherein detecting whether the negative side relay is malfunctioning based on the comparison and the operating state of the negative side relay comprises:
detecting that the negative side relay is normal when the negative side relay is in a conducting state and the error value is smaller than or equal to the threshold value; or alternatively, the process may be performed,
Detecting that the negative terminal relay has an open circuit fault when the negative terminal relay is in a conducting state and the error value is greater than the threshold value; or alternatively, the process may be performed,
detecting that the negative terminal relay has adhesion failure when the negative terminal relay is in an off state and the error value is smaller than or equal to the threshold value; or alternatively, the process may be performed,
and detecting that the negative terminal relay is normal when the negative terminal relay is in an off state and the error value is greater than the threshold value.
21. The method of claim 18, wherein obtaining the discharge capacity value of the charge-discharge assembly from the acquired voltage signal comprises:
and processing the at least two voltage signals by using a discharge formula and a voltage division formula of the charge-discharge assembly to obtain a calculated capacitance value of the charge-discharge assembly.
22. A computer-readable storage medium, comprising: computer-executable instructions which, when executed, perform the high voltage detection method of any one of claims 17 to 21.
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