CN107797054B - 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

Info

Publication number
CN107797054B
CN107797054B CN201710992287.4A CN201710992287A CN107797054B CN 107797054 B CN107797054 B CN 107797054B CN 201710992287 A CN201710992287 A CN 201710992287A CN 107797054 B CN107797054 B CN 107797054B
Authority
CN
China
Prior art keywords
relay
circuit
voltage
detected
detection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201710992287.4A
Other languages
Chinese (zh)
Other versions
CN107797054A (en
Inventor
罗杰超
但志敏
孙占宇
侯贻真
许佳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Contemporary Amperex Technology Co Ltd
Original Assignee
Contemporary Amperex Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Contemporary Amperex Technology Co Ltd filed Critical Contemporary Amperex Technology Co Ltd
Priority to CN202311728794.9A priority Critical patent/CN117723958A/en
Priority to CN201710992287.4A priority patent/CN107797054B/en
Publication of CN107797054A publication Critical patent/CN107797054A/en
Application granted granted Critical
Publication of CN107797054B publication Critical patent/CN107797054B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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

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, which are applied to the technical field of circuits. In an embodiment of the present invention, a high voltage detection circuit includes: the current detection sub-circuit is used for collecting current signals between the battery module and the main negative relay; the processing component is connected with the current detection sub-circuit; the relay detection sub-circuit is used for collecting an electric signal of the outer side of the relay to be detected of the non-main negative relay at the first end of the relay detection sub-circuit, and the second end of the relay detection sub-circuit is connected with the processing component; the battery module detects the sub-circuit, and the first end of battery module detects the sub-circuit and is used for gathering the anodal electrical signal of battery module, and the second end of battery module detects the sub-circuit and is connected with processing assembly. Therefore, the technical scheme provided by the embodiment of the invention can simplify the circuit structure and improve the safety performance 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 relay connected with the battery module needs to be detected to determine whether the relay fails, thereby avoiding the safety problem caused by the failure of the relay.
In the prior art, since the types of relays connected to the battery modules are different in different battery systems, a detection circuit for detecting whether a fault occurs is generally provided for each relay individually. The battery management system (Battery Management System, BMS) based on the low-voltage loop has good processing capability and control capability, so in the prior art, the detection circuit of each relay is generally integrated in the BMS, and the battery management unit (Battery Management Unit, BMU) in the BMS is used as a processor to detect whether the relay fails. In this way, one end of the detection circuit of the relay is connected with the relay located in the high-voltage loop, the other end of the detection circuit of the relay is connected with the BMU located in the low-voltage loop, and an isolation device for isolating high and low voltages is generally arranged between the detection circuit of the relay and the BMU for safety and sampling accuracy, and an electric signal of the detection circuit of the relay is transmitted into the BMU through the isolation device.
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 for isolating high and low voltages needs to be provided when the relay detection sub-circuit is integrated in the BMS, which increases the complexity of the overall circuit structure to some extent, and may also affect the safety performance of the entire battery system due to 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 improving the safety performance of the battery system to a certain extent.
In a first aspect, an embodiment of the present invention provides a high voltage detection circuit, including:
the current detection sub-circuit is used for collecting current signals between the battery module and the main negative relay;
the processing component is connected with the current detection sub-circuit;
the relay detection sub-circuit is used for collecting an electric signal of the outer side of the relay to be detected of the non-main negative relay, and the second end of the relay detection sub-circuit is connected with the processing component;
The battery module detection sub-circuit, the first end of battery module detection sub-circuit is used for gathering the anodal signal of battery module, the second end of battery module detection sub-circuit with processing assembly is connected.
In the aspect and any possible implementation manner as described above, there is further provided an implementation manner, where the relay to be detected includes at least one of a main positive relay, a pre-charging relay, a fast charging relay, a slow charging relay, and a heating relay.
In the aspect and any possible implementation manner as described above, there is further provided an implementation manner, wherein the number of the relay detection subcircuits is at least one;
each relay detection sub-circuit is used for detecting whether one relay to be detected has faults or not.
Aspects and any one of the possible implementations as described above, further provide an implementation, the relay detection sub-circuit including:
the first end of the first voltage dividing component is connected with an outer contact of the relay to be detected;
the first end of the second voltage division component is connected with the second end of the first voltage division component and 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 relay detection sub-circuit further includes:
the first end of the switch assembly is connected with the first end of the second voltage division assembly and the second end of the first voltage division assembly, and the second end of the switch assembly is connected with the first end of the processing assembly.
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.
In aspects and any one of the possible implementations described above, there is further provided an implementation, the switch assembly is a multiplexer;
the control end of the multiplexer is also connected with the processing component.
Aspects and any one of the possible implementations as described above, further provide an implementation, the current detection sub-circuit 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 main negative 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 an inner side contact of the main negative relay;
both ends of the built-in resistor of the shunt are connected to the processing assembly.
Aspects and any one of the possible implementations as described above, further provide an implementation, the current detection subcircuit 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.
In the aspects and any possible implementation manner as described above, there is further provided an implementation manner, the battery module detection sub-circuit includes:
the first end of the third voltage division component is connected with the positive electrode contact of the battery module;
And the first end of the fourth voltage division component is connected with the second end of the third voltage division component and the processing component, and the second end of the fourth voltage division component is grounded.
Aspects and any one of the possible implementations as described above, further provides an implementation,
the third voltage dividing assembly includes: at least one resistor; and/or at least one resistor array;
the fourth 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, the detection circuit further includes:
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.
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 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 high voltage detection circuit of any of the above implementations.
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:
the high-voltage detection circuit provided by the embodiment of the invention comprises a current detection sub-circuit, a processing component, a relay detection sub-circuit and a battery module detection sub-circuit, wherein the high-voltage detection circuit can be directly arranged in a high-voltage loop connected with the battery module, and can realize the processing of current detection by using one processing component and the processing of fault detection of a relay to be detected of a non-main negative relay, namely, the processing of the fault detection of the relay to be detected of the non-main negative relay can be realized by using one processing component; in addition, the processing component is also positioned in the high-voltage loop, so that an isolation device for isolating high and low voltages is not required to be arranged between the relay detection subcircuit and the processing component, the cost required by arranging the isolation device is saved, the circuit structure of the whole battery system is simplified, and the safety risk caused by the complex circuit structure is reduced to a certain extent; and, because the distance between processing module and relay detection sub-circuit, electric current detection sub-circuit, battery module detects sub-circuit shortens, the number and the length of pencil are shorter, have reduced the security risk that leads to because pencil number is more, pencil length is longer etc. to a certain extent, simultaneously, this has also reduced the loss in the signal of telecommunication through pencil transmission process, has improved sampling accuracy to, also improved the detection accuracy. Therefore, the technical scheme provided by the embodiment of the invention can simplify the circuit structure and improve the safety performance 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 current detection sub-circuit is connected with the negative electrode of the battery module, and the second end of the current detection sub-circuit is connected with the inner side contact of the main negative relay;
the processing component is connected with the third end of the current detection subcircuit;
the relay detection sub-circuit is connected with the outer side contact of the relay to be detected of the non-main negative relay at the first end, and connected with the processing assembly at the second end;
the battery module detection sub-circuit, the first end of battery module detection sub-circuit with battery module's anodal is connected, the second end of battery module detection sub-circuit with processing assembly is connected.
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 invention provides a detector, including: a high voltage detection circuit of any of the above implementations.
In a ninth aspect, an embodiment of the present invention provides a battery system including: a high voltage detection circuit of any of the above implementations.
In a tenth 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:
the high-voltage detection circuit provided by the embodiment of the invention comprises a current detection sub-circuit, a processing component, a relay detection sub-circuit and a battery module detection sub-circuit, wherein the high-voltage detection circuit can be directly arranged in a high-voltage loop connected with the battery module, and can realize the processing of current detection by using one processing component and the processing of fault detection of a relay to be detected of a non-main negative relay, namely, the processing of the fault detection of the relay to be detected of the non-main negative relay can be realized by using one processing component; in addition, the processing component is also positioned in the high-voltage loop, so that an isolation device for isolating high and low voltages is not required to be arranged between the relay detection subcircuit and the processing component, the cost required by arranging the isolation device is saved, the circuit structure of the whole battery system is simplified, and the safety risk caused by the complex circuit structure is reduced to a certain extent; and, because the distance between processing module and relay detection sub-circuit, electric current detection sub-circuit, battery module detects sub-circuit shortens, the number and the length of pencil are shorter, have reduced the security risk that leads to because pencil number is more, pencil length is longer etc. to a certain extent, simultaneously, this has also reduced the loss in the signal of telecommunication through pencil transmission process, has improved sampling accuracy to, also improved the detection accuracy. Therefore, the technical scheme provided by the embodiment of the invention can simplify the circuit structure and improve the safety performance of the battery system to a certain extent.
In an eleventh aspect, an embodiment of the present invention provides a high voltage detection method, which is performed in the high voltage detection circuit as described above, including the steps of:
collecting a first voltage signal through the relay detection sub-circuit;
collecting a current signal through the current detection subcircuit;
collecting a second voltage signal through the battery module detection sub-circuit;
determining the actual opening and closing states of the relay to be detected according to the first voltage signal, the current signal and the second voltage signal;
detecting that the relay to be detected breaks down when the theoretical opening and closing state of the relay to be detected is different from the actual opening and closing state;
and detecting that the relay to be detected is normal when the theoretical opening and closing state of the relay to be detected is the same as the actual opening and closing state.
In the aspect and any possible implementation manner described above, there is further provided an implementation manner, when a theoretical open-close state of the relay to be detected is different from the actual open-close state, detecting that the relay to be detected is faulty includes:
when the theoretical opening and closing state is a closing state and the actual opening and closing state is an opening state, detecting that the relay to be detected has an open-circuit fault;
And detecting that the relay to be detected has adhesion failure when the theoretical opening and closing state is an opening state and the actual opening and closing state is a closing state.
In the aspect and any possible implementation manner described above, there is further provided an implementation manner, determining an actual open-close state of the relay to be detected according to the first voltage signal, the current signal, and the second voltage signal, including:
obtaining the outer voltage of the relay to be detected according to the first voltage signal;
and when the current signal is 0 and/or the external voltage is 0, determining that the actual opening and closing state of the relay to be detected is an opening state.
In the aspect and any possible implementation manner described above, there is further provided an implementation manner, determining an actual open-close state of the relay to be detected according to the first voltage signal, the current signal, and the second voltage signal, including:
obtaining the outer voltage of the relay to be detected according to the first voltage signal;
acquiring the positive voltage of the battery module according to the second voltage signal;
obtaining the difference between the inner side pressure and the outer side pressure of the relay to be detected according to the outer side voltage of the relay to be detected and the positive voltage of the battery module;
When the internal and external side pressure difference is smaller than or equal to the conduction voltage drop of the relay to be detected, determining that the actual opening and closing state of the relay to be detected is a closed state;
and when the internal and external side pressure difference is smaller than or equal to the conduction voltage drop and the current signal is not 0, determining that the actual opening and closing state of the relay is a closed state.
Aspects and any one of the possible implementations as described above, further providing an implementation, the method further including:
and obtaining the product of the current signal and the contact resistance of the relay to be detected to serve as the conduction voltage drop of the relay to be detected.
Aspects and any one of the possible implementations as described above, further provides an implementation,
when the relay to be detected is a pre-charging relay, the contact resistance of the relay to be detected is the sum of the internal resistance and the pre-charging resistance of the pre-charging relay; or,
when the relay to be detected is other relays to be detected except the pre-charging relay, the internal resistance of the contact of the relay to be detected is the internal resistance of the relay to be detected.
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 high voltage detection method of any of the implementations described above.
One of the above technical solutions has the following beneficial effects:
in the embodiment of the invention, the relay detection sub-circuit, the current detection sub-circuit and the battery module detection sub-circuit are used for respectively collecting electric signals and determining the actual opening and closing states of the relay to be detected based on the electric signals, so that whether the relay to be detected has faults or not is determined according to the comparison of the actual opening and closing states of the relay to be detected and the theoretical opening and closing states. In the embodiment of the invention, when the actual opening and closing state of the relay to be detected is determined, the current signal and the voltage signal in the relay to be detected are comprehensively considered, and the actual opening and closing state of the relay to be detected can be judged based on the presence or absence of the current signal and/or the voltage signal, so that the relay to be detected is convenient, quick and high in accuracy; compared with the mode of simply relying on the voltage signal to realize the relay fault detection in the prior art, the embodiment of the invention can obtain more accurate detection results based on the collected voltage signal and current signal, and has higher accuracy and simple implementation mode.
[ 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 view of a first embodiment of a battery system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a second embodiment of a high voltage detection circuit according to the present invention;
fig. 4 is a schematic structural diagram of a third embodiment of a high voltage detection circuit according to the present invention;
fig. 5 is a schematic structural diagram of a fourth embodiment of a high voltage detection circuit according to the present invention;
fig. 6 is a schematic structural diagram of a fifth embodiment of the high voltage detection circuit according to the present invention;
fig. 7 is a schematic structural diagram of a sixth embodiment of a high voltage detection circuit according to the present invention;
fig. 8 is a schematic structural diagram of a seventh embodiment of a high voltage detection circuit according to the present invention;
FIG. 9 is a flow chart of a high voltage detection method according to an embodiment of the present invention;
fig. 10 is a schematic diagram of an implementation flow of step S904 in the high voltage detection method according to the embodiment of the present invention;
fig. 11 is a schematic structural diagram of a first embodiment of a circuit board according to an embodiment of the present invention;
FIG. 12 is a schematic view of a first embodiment of a detector according to an embodiment of the present invention;
Fig. 13 is a schematic structural view of a second embodiment of a battery system according to an embodiment of the present invention;
FIG. 14 is a schematic view of a first embodiment of a vehicle according to an embodiment of the present invention;
fig. 15 is a schematic structural diagram of an embodiment eight of a high voltage detection circuit provided in an embodiment of the present invention;
fig. 16 is a schematic structural diagram of a second embodiment of a circuit board according to an embodiment of the present invention;
FIG. 17 is a schematic diagram of a second embodiment of a detector according to an embodiment of the present invention;
fig. 18 is a schematic structural view of a third embodiment of a battery system provided by an embodiment of the present invention;
fig. 19 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 in the prior art, a relay detection sub-circuit is integrated in a BMS, so that a circuit structure is complex and safety risks exist, 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.
Specifically, 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 includes:
a current detection sub-circuit 11 for collecting a current signal between the battery module 20 and the main negative relay 30;
A processing component 12, the processing component 12 being connected to the current detection sub-circuit 11;
a relay detection sub-circuit 13, wherein a first end of the relay detection sub-circuit is used for collecting an electric signal of the outer side of the relay 40 to be detected of the non-main negative relay 30, and a second end of the relay detection sub-circuit 13 is connected with the processing component 12;
the battery module detection sub-circuit 14, a first end of the battery module detection sub-circuit 14 is used for collecting an electrical signal of the positive electrode of the battery module 20, and a second end of the battery module detection sub-circuit 14 is connected with the processing assembly 12.
It should be noted that, in the embodiment of the present invention, the relay 40 to be detected is another relay except the main negative relay 30.
In the high-voltage detection circuit according to the embodiment of the invention, the relay to be detected may include, but is not limited to, at least one of a main positive relay, a pre-charging relay, a fast charging relay, a slow charging relay and a heating relay.
Based on this, the number of relay detection subcircuits in the high-voltage detection circuit according to the embodiment of the present invention is at least one, and each relay detection subcircuit is used to detect whether a relay to be detected has a fault.
It can be appreciated that in the embodiment of the present invention, the number of relay detection subcircuits is less than or equal to the number of relays to be detected. When the number of the relay detection subcircuits is smaller than the number of the relays to be detected, the high-voltage detection circuit detects faults of part of the relays to be detected in the relays to be detected; when the number of the two relays is the same, the high-voltage detection circuit can realize fault detection of all relays to be detected.
In the embodiment of the invention, the electric signal on the outer side of the relay to be detected of the non-main negative relay, which is acquired by the first end of the relay detection sub-circuit, is the voltage signal of the outer side contact of the relay to be detected; the electric signal of the positive electrode of the battery module acquired by the first end of the battery module detection sub-circuit is a voltage signal of the positive electrode of the battery module. The outer side contact of the relay represents a contact of one side of the relay far away from the battery module, and the inner side contact of the relay represents a contact of one side of the relay close to the battery module.
Based on the high-voltage detection circuit 100 shown in fig. 1, at least one relay detection sub-circuit 13 is included in the high-voltage detection circuit 100, and each relay detection sub-circuit 13 is used for detecting whether a relay to be detected of a non-main negative relay is faulty. As shown in fig. 1 to 3, the relay detection sub-circuit 13 and the current detection sub-circuit 11 can both be processed by the processing component 12, that is, the current detection function and the fault detection function of the relay to be detected of the non-main negative relay can be simultaneously realized by using one processing component 12; in addition, as the processing component 12 is also positioned in the high-voltage loop, an isolation device for isolating high and low voltages is not required to be arranged between the relay detection subcircuit 13 and the processing component 12, the cost required by arranging the isolation device is saved, the circuit structure of the whole battery system is simplified, and the safety risk caused by the complex circuit structure is reduced to a certain extent; in addition, as the distance between the processing component 12 and the relay detection sub-circuit 13, the current detection sub-circuit 11 and the battery module detection sub-circuit 14 is shortened, the number and the length of the wire harnesses are shorter, the safety risk caused by the fact that the number of the wire harnesses is more, the length of the wire harnesses is longer and the like is reduced to a certain extent, and meanwhile, the loss in the electric signal passing through the wire harnesses is reduced, the sampling precision is improved, and therefore the detection precision is also improved.
The high-voltage detection circuit provided by the embodiment of the invention is used for detecting whether the relay to be detected of the non-main negative relay in the battery system fails or not, so that the types and the numbers of the relays to be detected contained in the battery system are related to the structure of the relay sub-circuit in the high-voltage detection circuit.
Therefore, in order to more clearly explain the present technical solution, the high voltage detection circuit will be specifically described below with reference to a high voltage circuit to which the high voltage detection circuit is specifically applied.
The structure of the battery system to which the embodiment of the invention is applied may include:
a battery module;
a load;
the main negative relay is connected between the negative electrode of the battery module and the load;
the relay to be detected is connected between the anode and the cathode of the battery module;
and a high voltage detection circuit.
In the embodiment of the present invention, one end of the relay to be detected is connected to the positive electrode of the battery module, and the connection relationship of the other end of the relay is not particularly limited. At this time, the connection relation of the side of the relay to be detected, which is far away from the battery module, is determined based on the performance of the loop to which the relay to be detected belongs.
For example, when the relay to be detected is a fast charging relay in the fast charging loop, one end of the fast charging relay is connected with the positive electrode of the battery module, and the other end of the fast charging relay is connected with the direct current charger; when the relay to be detected is a main positive relay in the main loop, one end of the main positive relay is connected with the positive electrode of the battery module, and the other end of the main positive relay is connected with a load.
Specifically, reference may be made to fig. 2, which is a schematic structural diagram of a first embodiment of a battery system according to an embodiment of the present invention. As shown in fig. 2, the battery system 200 includes:
a battery module 20;
a load 50;
a main negative relay 30 connected between the negative electrode (B-) of the battery module 20 and the load 50;
the relay to be detected 40 includes:
the main positive relay 40-1 is connected between the positive electrode (B+) of the battery module 20 and the load 50 and is used for controlling the on-off between the positive electrode (B+) of the battery module 20 and the load 50, so that the battery module 20, the main positive relay 40-1, the load 50 and the main negative relay 30 form a complete high-voltage loop;
a precharge relay 40-2 provided in the precharge circuit, the precharge circuit further comprising: a precharge resistor 60; wherein, the first end of the pre-charge resistor 60 is connected with the positive electrode (B+), the first end of the main positive relay 40-1 of the battery module 20, the second end of the pre-charge resistor 60 is connected with the first end of the pre-charge relay 40-2, and the second end of the pre-charge relay 40-2 is connected with the second end of the main positive relay 40-1;
the fast charging relay 40-3 is disposed in the fast charging circuit, and the fast charging circuit further includes: a direct current charger 70; wherein, the first end of the fast charging relay 40-3 is connected with the positive electrode (B+) of the battery module 20, the second end of the fast charging relay 40-3 is connected with the first end of the direct current charger 70, and the second end of the direct current charger 70 is connected with the negative electrode (B-) of the battery module 20;
The slow charging relay 40-4 is disposed in the slow charging circuit, and the slow charging circuit further includes: an alternating current charger 80; wherein, the first end of the slow charging relay 40-4 is connected with the positive electrode (B+) of the battery module 20, the second end of the slow charging relay 40-4 is connected with the first end of the AC charger 80, and the second end of the AC charger 80 is connected with the negative electrode (B-) of the battery module 20;
heating relay 40-5 is provided in a heating circuit, and the heating circuit further includes: a temperature sensing assembly 90; wherein, the first end of the heating relay 40-5 is connected with the positive electrode (B+) of the battery module 20, the second end of the heating relay 40-5 is connected with the first end of the temperature sensing assembly 90, and the second end of the temperature sensing assembly 90 is connected with the negative electrode (B-) of the battery module 20;
a high voltage detection circuit 100.
It should be noted that, the battery system shown in fig. 2 is a specific implementation manner of the battery system provided by the embodiment of the present invention, and when the present solution is actually implemented, the number and types of relays to be detected may be increased or decreased according to actual needs.
In one specific implementation, the temperature sensing component 90 in the circuit shown in FIG. 2 may be a positive temperature coefficient thermistor (Positive Temperature Coefficient, PTC).
In the high-voltage detection circuit provided by the embodiment of the invention, the relay detection subcircuit is used for detecting the electric signal at the outer side of the relay to be detected, so that the relay detection subcircuit is connected with the outer side contact of the relay to be detected in the actual connection process.
At this time, as shown in FIG. 2, the outer contact of the MAIN positive relay 40-1 is denoted as MAIN+ OUTSIDE, the outer contact of the PRE-charge relay 40-2 is denoted as PRE_OUTSIDE, the outer contact of the fast charge relay 40-3 is denoted as DC_OUTSIDE, the outer contact of the slow charge relay 40-4 is denoted as AC_OUTSIDE, and the outer contact of the heating relay 40-5 is denoted as TEMP_OUTSIDE.
Based on this, the structure of the high voltage detection circuit 100 in the battery system 200 shown in fig. 2 may refer to fig. 3, and fig. 3 is a schematic structural diagram of a second embodiment of the high voltage detection circuit according to the present invention. As shown in fig. 3, the high voltage detection circuit 100 includes:
a current detection sub-circuit 11;
a processing assembly 12;
a relay detection sub-circuit 13;
a battery module detection sub-circuit 14;
wherein the relay detection sub-circuit 13 includes:
a first relay detection sub-circuit 13-1, wherein a first end of the first relay detection sub-circuit 13-1 is used for collecting an electric signal outside the main positive relay 40-1, and a second end of the first relay detection sub-circuit is connected with the processing component 12; that is, the first relay detection sub-circuit 13-1 is connected between the OUTSIDE contact (MAIN + _outside) of the MAIN positive relay 40-1 and the processing component 12;
A second relay detection sub-circuit 13-2, wherein a first end of the second relay detection sub-circuit 13-2 is used for collecting an electric signal outside the pre-charging relay 40-2, and a second end is connected with the processing component 12; that is, the second relay detection sub-circuit 13-2 is connected between the OUTSIDE contact (pre_outside) of the precharge relay 40-2 and the processing component 12;
a third relay detection sub-circuit 13-3, wherein a first end of the third relay detection sub-circuit 13-3 is used for collecting an electric signal outside the quick charging relay 40-3, and a second end of the third relay detection sub-circuit is connected with the processing component 12; that is, the third relay detection sub-circuit 13-3 is connected between the OUTSIDE contact (DC_OUTSIDE) of the quick charge relay 40-3 and the processing assembly 12;
a fourth relay detection sub-circuit 13-4, wherein a first end of the fourth relay detection sub-circuit 13-4 is used for collecting an electric signal outside the slow charging relay 40-4, and a second end is connected with the processing component 12; that is, the fourth relay detection sub-circuit 13-4 is connected between the OUTSIDE contact (ac_outside) of the slow charge relay 40-4 and the processing component 12;
a fifth relay detection sub-circuit 13-5, wherein a first end of the fifth relay detection sub-circuit 13-5 is used for collecting an electric signal outside the heating relay 40-5, and a second end of the fifth relay detection sub-circuit is connected with the processing component 12; that is, the fifth relay detection sub-circuit 13-5 is connected between the external contact (temp_outside) of the heating relay 40-5 and the processing unit 12.
For ease of description, the relay detection subcircuit is represented as: 13-x, the relay to be tested is denoted 40-y. Wherein x represents the number of the relay detection sub-circuit, the value range of x is an integer between 1 and M, and M represents the total number of the relay detection sub-circuits; y represents the number of the relay to be detected, the value range of y is an integer between 1 and N, and N represents the total number of the relay to be detected; m is less than or equal to N. For example, for a high voltage detection circuit as shown in fig. 3, m=n=5.
In the high voltage detection circuit 100 shown in fig. 3, the external contact (pre_outide) of the PRE-charge relay 40-2 is the same as the external contact (main_outide) of the MAIN positive relay 40-1, and therefore, the first relay detection sub-circuit 13-1 and the second relay detection sub-circuit 13-2 may be implemented by the same relay detection sub-circuit 13-1. As shown in fig. 3, only the first relay detection sub-circuit 13-1 is identified, and the second relay detection sub-circuit 13-2 is omitted.
At this time, please refer to fig. 4, which is a schematic diagram illustrating a third embodiment of the high voltage detection circuit according to an embodiment of the present invention. As shown in fig. 4, the relay detection sub-circuit 13-x in the high voltage detection circuit 100 includes:
The first end of the first voltage division component 13-x-1 is connected with an outer contact of the relay 40-y to be detected;
the first end of the second voltage division component 13-x-2 is connected with the second end of the first voltage division component 13-x-1 and the processing component 12, and the second end of the second voltage division component 13-x-2 is grounded.
In the drawings according to the embodiments of the present invention, the ground is denoted as GND.
In the embodiment of the present invention, the principle of the relay detection sub-circuit 13-x collecting the electrical signal will be described by taking the first relay detection sub-circuit 13-1 in fig. 4 as an example. As shown in fig. 4, the processing component 12 may collect the voltage value at the node between the first voltage dividing component 13-1-1 and the second voltage dividing component 13-1-2, and based on the other end of the second voltage dividing component 13-x-2, the collected voltage value is the voltage division of the second voltage dividing component 13-1-2, and at this time, according to the resistance voltage division formula, it may be obtained:
wherein U is MAIN+_OUTSIDE Representing the voltage value of the outside contact of the main positive relay 40-1, U SP1 Representing the voltage value, R, collected by the first relay detection sub-circuit 13-1 13-1-1 Represents the resistance value, R, of the first voltage dividing component 13-1-1 13-1-2 The resistance of the second voltage divider block 13-1-2 is shown.
Similarly, as shown in FIG. 4, the processing component 12 may also derive from the resistive divider formula:
wherein U is PRE_OUTSIDE Indicating the voltage value of the outside contact of the precharge relay 40-2, U SP2 Representing the voltage value, R, collected by the second relay detection sub-circuit 13-2 13-2-1 Represents the resistance value, R, of the first voltage dividing component 13-2-1 13-2-2 A resistance value representing the second voltage dividing component 13-2-2; u (U) DC_OUTSIDE Indicating the voltage value of the outside contact of the quick charge relay 40-3, U SP3 Represents the voltage value, R, acquired by the third relay detection sub-circuit 13-3 13-3-1 Represents the resistance value, R, of the first voltage dividing component 13-3-1 13-3-2 A resistance value representing the second voltage dividing component 13-3-2; u (U) AC_OUTSIDE Indicating the voltage value of the outer contact of the slow charge relay 40-4, U SP4 Represents the voltage value, R, acquired by the fourth relay detection sub-circuit 13-4 13-4-1 Represents the resistance value, R, of the first voltage dividing component 13-4-1 13-4-2 The resistance value of the second voltage dividing component 13-4-2; u (U) TEMP_OUTSIDE Indicating the voltage value of the outer contact of heating relay 40-5, U SP5 Represents the voltage value, R, collected by the fifth relay detection sub-circuit 13-5 13-5-1 Represents the resistance value, R, of the first voltage dividing component 13-5-1 13-5-2 The resistance of the second voltage divider block 13-5-2 is shown.
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.
In the embodiment of the present invention, the resistor and the resistor array are not particularly limited in terms of their expression forms. For example, the resistance may include, but is not limited to: at least one of the column resistor and the chip resistor. The resistor array may include, but is not limited to: at least one of a column resistor array and a chip resistor array. The chip resistor or the chip resistor array has smaller volume, and can further achieve the effect of simplifying the circuit structure.
It can be appreciated that when a single resistor is used as the first voltage dividing component and/or the second voltage dividing component, the circuit structure is simpler, the complexity of the circuit can be reduced to a certain extent, and the safety of the resistor is improved; when the resistor array is adopted as the first voltage dividing component and/or the second voltage dividing component, the resistor array can comprise a plurality of resistor units, each resistor unit is provided with more connection modes, flexibility is high, and when the resistor units are connected in parallel, even if part of the resistor units break down, the charging function of the whole charging component is not greatly affected, and the safety performance and the service life of the whole circuit are improved to a certain extent.
Thus, as shown in fig. 4, the first end of the processing component 12 may collect the voltage signal at the node connected between the first voltage dividing component 13-x-1 and the second voltage dividing component 13-x-2, since the second voltage dividing component 13-x-2 is grounded, that is, the voltage value of the second voltage dividing component 13-x-2 is collected through the first end of the processing component 12 connected to the relay detection sub-circuit 13.
In a specific implementation process, the processing component can continuously collect voltage signals of the outer contacts of the relay to be detected through the relay detection sub-circuit, and the voltage signals do not need to be continuously collected, so that continuous collection of signals like the bands causes resource waste of the processing component, and therefore, the switching component can be further arranged in the relay detection sub-circuit.
In the embodiment of the invention, the relay detection sub-circuit may further include:
the first end of the switch assembly is connected with the first end of the second voltage division assembly and the second end of the first voltage division assembly, and the second end of the switch assembly is connected with the first end of the processing assembly.
Therefore, the processing assembly can be controlled to execute sampling and detection processing only by opening or closing the switch assembly according to actual needs, so that the acquisition work and the processing work of unnecessary data are avoided, and the resource occupancy rate of the processing assembly is reduced.
In an embodiment of the present invention, the switch assembly may include, but is not limited to: the embodiment of the invention is not particularly limited to the expression form of the switch assembly, such as a mechanical switch and a switch tube.
In a specific application scenario, considering that a plurality of relay detection subcircuits may be provided in the high voltage detection circuit, it may be necessary to separately provide a switch component for each relay detection subcircuit, where the switch component may be a multiplexer, and a control end of the multiplexer is further connected to the processing component. In this way, the processing component can send control signals to the multiplexer according to actual needs, so that the multiplexer can open or close the relay detection subcircuit according to the received control signals.
In view of 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. 5, which is a schematic structural diagram of a fourth embodiment of the high voltage detection circuit according to the present invention, and the current detection sub-circuit 11 in the high voltage detection circuit 100 shown in fig. 5 includes:
And a current detection component 111, wherein a first end of the current detection component 111 is connected with a negative electrode (B-) of the battery module 20, a second end of the current detection component 111 is connected with an inner side contact (HVMAIN_INSIDE) of the main negative relay 30, and a third end and a fourth end of the current detection component 111 are both connected to the processing component 12.
As shown in fig. 5, in the high voltage detection circuit 100, the specific configuration of the current detection unit 111 is not particularly limited, and in the actual implementation, a current detection unit such as a current divider or a hall sensor may be used to realize the current detection function.
In the embodiment of the present invention, as shown in fig. 5, the current detection component 111 may acquire a voltage signal of an input end and a voltage signal of an output end, and then acquire a difference between the two voltage signals to obtain a voltage value of the current detection component 111, and then divide the voltage value of the current detection component 111 by a resistance value of the current detection component 111 to obtain a current value flowing through the current detection component 111.
In addition, as shown in fig. 5, in the embodiment of the present invention, the current detecting component 111 is connected between the negative electrode of the battery module 20 and the inner contact of the main negative relay 30, that is, the detector 111 is connected to the main circuit connected to the battery module 20, and the current value flowing through the detector 111 is the main circuit current value. Thus, the main loop current is obtained, and the detection of the main loop current is realized.
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.
Referring to fig. 6, which is a schematic diagram of a fifth embodiment of the high voltage detection circuit according to the present invention, in the current detection sub-circuit 11 of the high voltage detection circuit 100 shown in fig. 6, the current detection component 111 includes:
a shunt 111-1 with a built-in resistor is provided.
Wherein, the first end of the shunt 111-1 is connected with the negative electrode (B-) of the battery module 20; a second terminal of the shunt 111-1 is connected to an INSIDE contact (hvmain_inside) of the main negative relay 30; both ends of the built-in resistor 111-11 of the shunt are connected to the processing assembly 12.
Based on the high voltage detection circuit shown in fig. 6, when receiving the current detection command, the processing component 12 may acquire the current value of the main loop by acquiring the voltage values across the built-in resistor 111-11 of the shunt, thereby obtaining the current value of the main loop according to the resistance value of the built-in resistor 111-11 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 111-11 Representing the resistance value, U, of the built-in resistor 111-11 of the shunt SP6 Representing the voltage value of the current input terminal of the built-in resistor 111-11 of the shunt, U SP7 Representing the voltage value at the current output of the built-in resistor 111-11 of the shunt.
In the embodiment of the present invention, considering that when the current detecting component 111 is the shunt 111-1, there may be a problem of temperature rise of the shunt 111-1, when the temperature of the shunt 111-1 is high enough, the safety performance of the whole circuit may be adversely affected, and therefore, a temperature sensing component may be further disposed in the current detecting component.
At this time, as shown in fig. 6, the current detection sub-circuit 11 in the high voltage detection circuit 100 further includes:
the temperature sensing component 112 is arranged outside the shunt 111-1 and is in contact with the built-in resistor 111-11 of the shunt, and the temperature sensing component 112 is connected with the processing component 12.
In this manner, through the connection between the temperature sensing component 112 and the processing component 12, the temperature sensing component 112 can transmit the collected temperature signals to the processing component 12, and the processing component 12 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 negative temperature coefficient thermistor (Negative Temperature Coefficient, NTC).
In the embodiment of the present invention, the specific structure of the high voltage detection circuit may refer to fig. 7. Fig. 7 is a schematic diagram of a fifth embodiment of a high voltage detection circuit according to an embodiment of the present invention. As shown in fig. 7, the battery module detection sub-circuit 14 of the high voltage detection circuit 100 includes:
The third voltage division component 141, the first end of the third voltage division component 141 is connected with the positive electrode contact (B+) of the battery module 20;
the first end of the fourth voltage dividing assembly 142 is connected to the second end of the third voltage dividing assembly 141 and the processing assembly 12, and the second end of the fourth voltage dividing assembly 142 is grounded.
Based on the high voltage detection circuit 100 shown in fig. 7, the processing component 12 may collect the voltage value at the node between the third voltage division component 13-1-1 and the fourth voltage division component 142, and based on the other end of the fourth voltage division component 142, the collected voltage value is the voltage division of the fourth voltage division component 142, and at this time, according to the resistance voltage division formula, it may be obtained:
wherein U is B+ Indicating the voltage value of the positive contact of the battery module 20, U SP8 Represents the voltage value, R, collected by the battery module detection subcircuit 14 141 Represents the resistance value of the third voltage dividing component 141, R 142 The resistance of the fourth voltage divider 142 is shown.
In a specific application scenario, as shown in fig. 7, in the high voltage detection circuit 100, the third voltage dividing component includes: at least one resistor; and/or at least one resistor array.
In another specific application scenario, as shown in the high voltage detection circuit 100 of fig. 7, the fourth voltage dividing component includes: at least one resistor; and/or at least one resistor array.
The processing component involved in the embodiment of the invention can be a micro control unit, namely a singlechip. In a specific application scenario, the processing chip can be used as a processing component to realize detection of current and fault detection of the relay.
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 entire detection circuit as shown in fig. 1 to 6 is disposed in the high voltage circuit, and a power source 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 detection circuit provided by the embodiment of the present invention.
At this time, reference may be made to fig. 8, which is a schematic structural diagram of a seventh embodiment of the high voltage detection circuit provided in the embodiment of the present invention, as shown in fig. 8, where the high voltage detection circuit 100 includes, in addition to the overall circuit structure shown in fig. 7:
the spacer 15 is provided at an edge region of the processing module 12 where the low-voltage circuit is connected.
As shown in fig. 8, the high voltage detection circuit 100 further includes:
And a power supply assembly 16, wherein a first end of the power supply assembly 16 is connected with the processing assembly 12, and a second end of the power supply assembly 16 is connected with the power supply device 300.
When the isolation belt 15 is provided in the high voltage detection circuit 100 shown in fig. 8, the power supply units 16 are provided on both sides of the isolation belt 15 so as to extend across the isolation belt 15.
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 16 in the high voltage detection circuit as shown in fig. 8 may be a transformer.
When the high voltage detection circuit 100 shown in fig. 8 is applied to the field of electric vehicles, the power supply device 300 for supplying power to the processing unit 12 may be a body power supply device of an electric vehicle.
In another specific implementation process, when the processing component performs fault detection of the relay, the theoretical open-close state of the relay can be obtained through communication with the BMS, so that the communication component needs to be further arranged in the high-voltage detection circuit in consideration of the communication requirement of the processing component.
At this time, as shown in fig. 8, the high voltage detection circuit 100 further includes:
The first end of the communication assembly 17 is connected with the processing assembly 12, and the second end of the communication assembly 17 is connected with the overall control system 400.
When the isolation belt 15 is provided in the high voltage detection circuit 100 shown in fig. 8, the communication modules 17 are provided on both sides of the isolation belt 15 so as to extend across the isolation belt 15.
In an embodiment of the present invention, as shown in fig. 8, the communication component 17 may be an isolated chip. The overall control system 400 may be an overall control system of an electric vehicle, for example, an overall console of a vehicle body, or a BMS, etc. Based on the circuit configuration of any of the above high voltage detection circuits, a working method of the high voltage detection circuit for detecting whether or not a relay to be detected is faulty will be described below.
Fig. 9 is a schematic flow chart of a high voltage detection method according to an embodiment of the present invention, where the high voltage detection method is applied to a high voltage detection circuit in any implementation manner as described above, and is executed in a processing component, and includes the following steps:
s902a, collecting a first voltage signal through a relay detection sub-circuit.
S902b, collecting a current signal through a current detection sub-circuit.
S902c, collecting a second voltage signal through a battery module detection sub-circuit.
It should be noted that, the manner in which S902a, S902b, and S902c are sequentially executed in fig. 9 is a possible implementation manner, and in a specific implementation scenario, S902a, S902b, and S902c may be executed simultaneously or may be executed sequentially in a preset order, which is not particularly limited in the embodiment of the present invention.
It should be noted that the first voltage signal is not a voltage signal of an outer contact of the relay to be detected; the second voltage signal is not a voltage signal of the positive contact of the battery module.
S904, determining the actual opening and closing states of the relay to be detected according to the first voltage signal, the current signal and the second voltage signal.
S906a, when the theoretical open-close state of the relay to be detected is different from the actual open-close state, detecting that the relay to be detected is malfunctioning.
S906b, when the theoretical open-close state of the relay to be detected is the same as the actual open-close state, detecting that the relay to be detected is normal.
In the embodiment of the invention, the relay detection sub-circuit, the current detection sub-circuit and the battery module detection sub-circuit are used for respectively collecting electric signals and determining the actual opening and closing states of the relay to be detected based on the electric signals, so that whether the relay to be detected has faults or not is determined according to the comparison of the actual opening and closing states of the relay to be detected and the theoretical opening and closing states. In the embodiment of the invention, when the actual opening and closing state of the relay to be detected is determined, the current signal and the voltage signal in the relay to be detected are comprehensively considered, and the actual opening and closing state of the relay to be detected can be judged based on the presence or absence of the current signal and/or the voltage signal, so that the relay to be detected is convenient, quick and high in accuracy; compared with the mode of simply relying on the voltage signal to realize the relay fault detection in the prior art, the embodiment of the invention can obtain more accurate detection results based on the collected voltage signal and current signal, and has higher accuracy and simple implementation mode.
In the embodiment of the present invention, when executing step S904, the following cases may be included:
first, according to the first voltage signal, an outside voltage of the relay to be detected is obtained, and when the current signal is 0 and/or the outside voltage is 0, an actual open-close state of the relay to be detected is determined to be an open state.
Secondly, obtaining the outer side voltage of the relay to be detected according to the first voltage signal, obtaining the positive electrode voltage of the battery module according to the second voltage signal, and obtaining the inner and outer side pressure difference of the relay to be detected according to the outer side voltage of the relay to be detected and the positive electrode voltage of the battery module, thereby determining that the actual opening and closing state of the relay to be detected is a closed state when the inner and outer side pressure difference is smaller than or equal to the conduction pressure drop of the relay to be detected; or when the difference between the inner and outer side pressure is smaller than or equal to the conduction voltage drop and the current signal is not 0, determining that the actual opening and closing state of the relay is a closed state.
Based on this, an embodiment of the present invention provides a specific implementation manner of executing S904, please refer to fig. 10, which is a schematic diagram of an implementation flow of step S904 in the high voltage detection method provided by the embodiment of the present invention, as shown in fig. 10, S904 may include the following steps:
And S904a, obtaining the outer voltage of the relay to be detected according to the first voltage signal.
The implementation manner of this step may refer to the above description about the working principle of the relay detection sub-circuit, and will not be described herein.
S904b, judging whether at least one of the external voltage and current signals is 0, if so, executing S904g; if not, S904c is performed.
And S904c, acquiring the positive voltage of the battery module according to the second voltage signal.
The implementation manner of this step may refer to the above description about the working principle of the detection sub-circuit of the battery module, which is not described herein.
And S904d, obtaining the internal and external side pressure difference of the relay to be detected according to the external side voltage of the relay to be detected and the positive electrode voltage of the battery module.
S904e, detecting whether the difference between the inner side pressure and the outer side pressure is smaller than or equal to the conduction voltage drop of the relay to be detected; if yes, executing S904f; if not, ending.
S904f, determining that the actual open/close state of the relay to be detected is a closed state.
S904g, determining that the actual open/close state of the relay to be detected is an open state.
The manner of obtaining the conduction voltage drop of the relay to be detected in S904e may be: and obtaining the product of the current signal and the contact resistance of the relay to be detected to serve as the conduction voltage drop of the relay to be detected.
In the embodiment of the present invention, the contact resistance of the relay to be detected may further include the following two cases:
first, when the relay to be detected is a pre-charge relay, the contact resistance of the relay to be detected is the sum of the internal resistance and the pre-charge resistance of the pre-charge relay.
Referring to fig. 2, in the pre-charging circuit, a pre-charging resistor 60 is further connected between the pre-charging relay 40-2 and the positive electrode of the battery module 20, and at this time, the differential pressure between the inner side and the outer side of the pre-charging relay 40-2 obtained by the first voltage signal and the second voltage signal includes the partial pressure of the pre-charging resistor 60 and the partial pressure of the pre-charging relay 40-2, so that the effect of the pre-charging resistor 60 on the conduction voltage drop needs to be considered when the conduction voltage drop of the pre-charging relay is obtained.
Second, when the relay to be detected is another relay to be detected other than the precharge relay, the internal resistance of the contact of the relay to be detected is the internal resistance of the relay to be detected.
Referring to fig. 2, the relays 40-y to be detected (when y is not equal to 2) except the pre-charging relay 40-2 are all directly connected to the positive electrode of the battery module 20, so that the internal-external differential pressure of the relays to be detected obtained through the first voltage signal and the second voltage signal only includes the partial pressure of the relays, and only needs to consider the contribution of the relays to be detected to the conduction voltage drop.
It should be noted that, the detection steps implemented on the premise of not violating the above principle are all within the scope of the technical solution provided by the embodiment of the present invention, the flow shown in fig. 10 is only one possible implementation, and in an actual application scenario, the execution sequence of some steps may be adjusted as required. For example, the step of acquiring the positive electrode voltage of the battery module in S904c may be performed in advance, for example, may be performed simultaneously with S904a, or may be performed before or after S904a is performed, or the like.
Based on the detection in step S904, the actual working state of the relay to be detected is obtained, and before step S906 is performed, the theoretical open-close state of the relay to be detected needs to be obtained.
In a specific implementation, this step may be implemented by a communication component in the high voltage detection circuit. For example, a general BMS is used to control the open/close states of the relays, and thus, the BMS stores the theoretical open/close states of the relays to be detected in advance, and thus, the processing unit can receive the theoretical open/close states of the relays to be detected, which are transmitted from the BMS, only by communicating with the BMS through the communication unit.
Based on the above steps, when S906a is executed, the fault type of the relay to be detected may be determined based on the theoretical open-close state and the actual open-close state of the relay to be detected, and at this time, the following two cases may be included:
In the first case, when the theoretical open-close state is the closed state and the actual open-close state is the open state, the occurrence of the open-circuit failure of the relay to be detected is detected.
In the second case, when the theoretical open-close state is the open state and the actual open-close state is the closed state, the occurrence of the adhesion failure of the relay to be detected is detected.
In order to fully explain the present embodiment, the high voltage detection method will be exemplified below with reference to the high voltage detection circuit 100 shown in fig. 4.
As shown in fig. 4, when fault detection for the main positive relay 40-1 is achieved by the first relay detection sub-circuit 13-1, reference may be made to table 1:
TABLE 1
Wherein U is MAIN+_OUTSIDE Representing the voltage value of the outside contact of the main positive relay 40-1, U B+ Voltage value Δu representing positive electrode contact of battery module 20 MAIN+ The on-state voltage drop of the main positive relay 40-1 is shown, and I is the current value of the main circuit.
As shown in table 1, when the theoretical open-close state of the main relay 40-1 is the same as the actual open-close state, it includes: when the main positive relay 40-1 is in the closed state or in the open state, the main positive relay 40-1 is detected to be normal and has no fault; when the voltage value of the outer contact of the main positive relay 40-1 is 0 and/or the main loop current value is 0, determining that the actual opening and closing state is an opening state, and if the theoretical opening and closing state is a closing state, detecting that the main positive relay 40-1 has an open circuit fault; when the difference between the inner and outer side pressure of the main positive relay 40-1 is smaller than or equal to the conduction voltage drop, the actual opening and closing state is determined to be the closed state, and if the theoretical opening and closing state is the open state, the adhesion fault of the main positive relay 40-1 is detected.
As shown in fig. 4, when the fault detection of the precharge relay 40-2 is implemented by the second relay detection sub-circuit 13-2, reference may be made to table 2:
TABLE 2
Wherein U is PRE_OUTSIDE Indicating the voltage value of the outside contact of the precharge relay 40-2, U B+ Voltage value Δu representing positive electrode contact of battery module 20 PRE The on-state voltage drop of the precharge relay 40-2 is shown, and I is the current value of the main circuit.
As shown in table 2, when the theoretical open-close state of the precharge relay 40-2 is the same as the actual open-close state, it includes: when the charging relay 40-2 is in the closed state or in the open state, the charging relay is detected to be normal and no fault occurs; when the voltage value of the outer contact of the pre-charging relay 40-2 is 0 and/or the main loop current value is 0, determining that the actual opening and closing state is an opening state, and if the theoretical opening and closing state is a closing state, detecting that the pre-charging relay 40-2 has an open circuit fault; when the difference between the inner and outer side pressure of the pre-charge relay 40-2 is smaller than or equal to the conduction voltage drop, the actual opening and closing state is determined to be the closed state, and if the theoretical opening and closing state is the open state, the adhesion fault of the pre-charge relay 40-2 is detected.
As shown in fig. 4, when the fault detection of the quick charge relay 40-3 is implemented by the third relay detection sub-circuit 13-3, reference may be made to table 3:
TABLE 3 Table 3
Wherein U is DC_OUTSIDE Indicating the voltage value of the outside contact of the quick charge relay 40-3, U B+ Voltage value Δu representing positive electrode contact of battery module 20 DC The on-state voltage drop of the fast charge relay 40-3 is shown, and I is the current value of the main circuit.
As shown in table 3, when the theoretical open-close state of the quick charge relay 40-3 is the same as the actual open-close state, it includes: when the two are in the closed state or the open state, the quick charge relay 40-3 is detected to be normal and has no fault; when the voltage value of the outer contact of the quick charge relay 40-3 is 0 and/or the main loop current value is 0, determining that the actual opening and closing state is an opening state, and if the theoretical opening and closing state is a closing state, detecting that the quick charge relay 40-3 has an open circuit fault; when the difference between the inner and outer side pressure of the fast charging relay 40-3 is smaller than or equal to the conduction voltage drop, the actual opening and closing state is determined to be the closed state, and if the theoretical opening and closing state is the open state, the fast charging relay 40-3 is detected to have adhesion fault.
As shown in fig. 4, when the fault detection of the slow charge relay 40-4 is implemented by the fourth relay detection sub-circuit 13-4, reference may be made to table 4:
TABLE 4 Table 4
Wherein U is AC_OUTSIDE Indicating the voltage value of the outer contact of the slow charge relay 40-4, U B+ Voltage value Δu representing positive electrode contact of battery module 20 AC The conduction voltage drop of the slow charge relay 40-4 is shown, and I is the current value of the main circuit.
As shown in table 4, when the theoretical open-close state of the slow charge relay 40-4 is the same as the actual open-close state, it includes: when the charging relay 40-4 is in the closed state or in the open state, the charging relay is detected to be normal and has no fault; when the voltage value of the outer contact of the slow charge relay 40-4 is 0 and/or the main loop current value is 0, determining that the actual opening and closing state is an opening state, and if the theoretical opening and closing state is a closing state, detecting that the slow charge relay 40-4 has an open circuit fault; when the difference between the inner and outer side pressure of the slow charge relay 40-4 is smaller than or equal to the conduction voltage drop, the actual opening and closing state is determined to be the closed state, and if the theoretical opening and closing state is the open state, the adhesion fault of the slow charge relay 40-4 is detected.
As shown in fig. 4, when the fault detection of the heating relay 40-5 is implemented by the fifth relay detection sub-circuit 13-5, reference may be made to table 5:
TABLE 5
/>
Wherein U is TEMP_OUTSIDE Indicating the voltage value of the outer contact of heating relay 40-5, U B+ Voltage value Δu representing positive electrode contact of battery module 20 TEMP The conduction voltage drop of the heating relay 40-5 is shown, and I is the current value of the main circuit.
As shown in table 5, when the theoretical open-close state of the heating relay 40-5 is the same as the actual open-close state, it includes: when the heating relay 40-5 is in the closed state or in the open state, the heating relay 40-5 is detected to be normal and has no fault; when the voltage value of the outer contact of the heating relay 40-5 is 0 and/or the main loop current value is 0, determining that the actual opening and closing state is an opening state, and if the theoretical opening and closing state is a closing state, detecting that the heating relay 40-5 has an open circuit fault; when the difference between the inner and outer side pressure of the heating relay 40-5 is smaller than or equal to the on voltage drop, the actual opening and closing state is determined to be the closed state, and if the theoretical opening and closing state is the open state, the adhesion fault of the heating relay 40-5 is detected.
Based on the above, embodiments of the present invention also provide 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.
The embodiment of the invention also provides a circuit board. Referring to fig. 11, 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. 11, a circuit board 1100 includes: the high voltage detection circuit 100 obtained in any of the above implementations.
The embodiment of the invention also provides a detector. Referring to fig. 12, 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. 12, the detector 1200 includes: the high voltage detection circuit 100 obtained in any of the above implementations.
The embodiment of the invention also provides a battery system. Referring to fig. 13, which is a schematic structural diagram of a second embodiment of a battery system according to an embodiment of the invention, as shown in fig. 13, the battery system 200 includes: the high voltage detection circuit 100 obtained in any of the above implementations.
The embodiment of the invention also provides a carrier. Referring to fig. 14, which is a schematic structural diagram of a first embodiment of a vehicle according to an embodiment of the present invention, as shown in fig. 14, the vehicle 1400 includes: the high voltage detection circuit 100 obtained in any of the above implementations.
In one specific implementation, the vehicle 1400 shown in fig. 14 is an electric vehicle.
The technical scheme of the embodiment of the invention has the following beneficial effects:
the high-voltage detection circuit provided by the embodiment of the invention comprises a current detection sub-circuit, a processing component, a relay detection sub-circuit and a battery module detection sub-circuit, wherein the high-voltage detection circuit can be directly arranged in a high-voltage loop connected with the battery module, and can realize the processing of current detection by using one processing component and the processing of fault detection of a relay to be detected of a non-main negative relay, namely, the processing of the fault detection of the relay to be detected of the non-main negative relay can be realized by using one processing component; in addition, the processing component is also positioned in the high-voltage loop, so that an isolation device for isolating high and low voltages is not required to be arranged between the relay detection subcircuit and the processing component, the cost required by arranging the isolation device is saved, the circuit structure of the whole battery system is simplified, and the safety risk caused by the complex circuit structure is reduced to a certain extent; and, because the distance between processing module and relay detection sub-circuit, electric current detection sub-circuit, battery module detects sub-circuit shortens, the number and the length of pencil are shorter, have reduced the security risk that leads to because pencil number is more, pencil length is longer etc. to a certain extent, simultaneously, this has also reduced the loss in the signal of telecommunication through pencil transmission process, has improved sampling accuracy to, also improved the detection accuracy. Therefore, the technical scheme provided by the embodiment of the invention can simplify the circuit structure and improve the safety performance of the battery system to a certain extent.
Example two
The embodiment of the invention provides a high-voltage detection circuit. Fig. 15 is a schematic diagram of an embodiment eight of a high voltage detection circuit according to an embodiment of the invention. As shown in fig. 15, the high voltage detection circuit 1500 includes:
a current detection sub-circuit 11, wherein a first end of the current detection sub-circuit 11 is connected with the negative electrode of the battery module 20, and a second end of the current detection sub-circuit 11 is connected with an inner side contact of the main negative relay 30;
a processing component 12, the processing component 12 being connected to a third terminal of the current detection sub-circuit 11;
a relay detection sub-circuit 13, wherein a first end of the relay detection sub-circuit 13 is connected with an outer contact of a relay 40 to be detected of a non-main negative relay, and a second end of the relay detection sub-circuit 13 is connected with the processing component 12;
the battery module detection sub-circuit 14, the first end of the battery module detection sub-circuit 14 is connected with the positive electrode of the battery module 20, and the second end of the battery module detection sub-circuit 14 is connected with the processing assembly 12.
The parts (such as the working method of the present high voltage detection circuit) not described in detail in the embodiments of the present invention may refer to the related description of the first embodiment, and will not be described herein.
The embodiment of the invention also provides a circuit board. Referring to fig. 16, 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. 16, a circuit board 1100 includes: the high voltage detection circuit 1500 obtained in any of the above implementations.
The embodiment of the invention also provides a detector. Referring to fig. 17, 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. 17, the detector 1200 includes: the high voltage detection circuit 1500 obtained in any of the above implementations.
The embodiment of the invention also provides a battery system. Referring to fig. 18, which is a schematic structural diagram of a third embodiment of a battery system according to an embodiment of the present invention, as shown in fig. 18, the battery system 200 includes: the high voltage detection circuit 1500 obtained in any of the above implementations.
The embodiment of the invention also provides a carrier. Referring to fig. 19, which is a schematic structural diagram of a second embodiment of a vehicle according to an embodiment of the present invention, as shown in fig. 19, the vehicle 1400 includes: the high voltage detection circuit 1500 obtained in any of the above implementations.
In one specific implementation, the vehicle 1400 shown in fig. 19 is an electric vehicle.
The technical scheme of the embodiment of the invention has the following beneficial effects:
the high-voltage detection circuit provided by the embodiment of the invention comprises a current detection sub-circuit, a processing component, a relay detection sub-circuit and a battery module detection sub-circuit, wherein the high-voltage detection circuit can be directly arranged in a high-voltage loop connected with the battery module, and can realize the processing of current detection by using one processing component and the processing of fault detection of a relay to be detected of a non-main negative relay, namely, the processing of the fault detection of the relay to be detected of the non-main negative relay can be realized by using one processing component; in addition, the processing component is also positioned in the high-voltage loop, so that an isolation device for isolating high and low voltages is not required to be arranged between the relay detection subcircuit and the processing component, the cost required by arranging the isolation device is saved, the circuit structure of the whole battery system is simplified, and the safety risk caused by the complex circuit structure is reduced to a certain extent; and, because the distance between processing module and relay detection sub-circuit, electric current detection sub-circuit, battery module detects sub-circuit shortens, the number and the length of pencil are shorter, have reduced the security risk that leads to because pencil number is more, pencil length is longer etc. to a certain extent, simultaneously, this has also reduced the loss in the signal of telecommunication through pencil transmission process, has improved sampling accuracy to, also improved the detection accuracy. Therefore, the technical scheme provided by the embodiment of the invention can simplify the circuit structure and improve the safety performance of the battery system to a certain extent.
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 (23)

1. A high voltage detection circuit, comprising:
the current detection sub-circuit is used for collecting current signals between the battery module and the main negative relay;
the processing component is connected with the current detection sub-circuit;
the relay detection subcircuit and the processing component are arranged in a high-voltage loop; the first end of the relay detection sub-circuit is used for collecting an electric signal of the outer side of the relay to be detected of the non-main negative relay, and the second end of the relay detection sub-circuit is connected with the processing component;
the battery module detection sub-circuit, the first end of battery module detection sub-circuit is used for gathering the anodal signal of battery module, the second end of battery module detection sub-circuit with processing assembly is connected.
2. The high voltage detection circuit of claim 1, wherein the relay to be detected comprises at least one of a main positive relay, a pre-charge relay, a fast charge relay, a slow charge relay, and a heating relay.
3. The high voltage detection circuit according to claim 1 or 2, wherein the number of relay detection sub-circuits is at least one;
each relay detection sub-circuit is used for detecting whether one relay to be detected has faults or not.
4. The high voltage detection circuit of claim 1, wherein the relay detection sub-circuit comprises:
the first end of the first voltage dividing component is connected with an outer contact of the relay to be detected;
the first end of the second voltage division component is connected with the second end of the first voltage division component and the processing component, and the second end of the second voltage division component is grounded.
5. The high voltage detection circuit of claim 4, wherein the relay detection sub-circuit further comprises:
the first end of the switch assembly is connected with the first end of the second voltage division assembly and the second end of the first voltage division assembly, and the second end of the switch assembly is connected with the first end of the processing assembly.
6. The high voltage detection circuit of claim 4, 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.
7. The high voltage detection circuit of claim 5, wherein the switch assembly is a multiplexer;
the control end of the multiplexer is also connected with the processing component.
8. The high voltage detection circuit of claim 1, wherein the current detection subcircuit comprises:
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 main negative relay, and the third end and the fourth end of the current detection component are connected to the processing component.
9. The high voltage detection circuit of claim 8, 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 an inner side contact of the main negative relay;
both ends of the built-in resistor of the shunt are connected to the processing assembly.
10. The high voltage detection circuit of claim 1, wherein the battery module detection sub-circuit comprises:
The first end of the third voltage division component is connected with the positive electrode contact of the battery module;
and the first end of the fourth voltage division component is connected with the second end of the third voltage division component and the processing component, and the second end of the fourth voltage division component is grounded.
11. The high voltage detection circuit of claim 10, wherein,
the third voltage dividing assembly includes: at least one resistor; and/or at least one resistor array;
the fourth voltage dividing assembly includes: at least one resistor; and/or at least one resistor array.
12. The high voltage detection circuit of claim 1, wherein the detection circuit further comprises:
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.
13. A high voltage detection circuit, comprising:
the first end of the current detection sub-circuit is connected with the negative electrode of the battery module, and the second end of the current detection sub-circuit is connected with the inner side contact of the main negative relay;
the processing component is connected with the third end of the current detection subcircuit;
the relay detection subcircuit and the processing component are arranged in a high-voltage loop; the first end of the relay detection sub-circuit is connected with an outer side contact of a relay to be detected of the non-main negative relay, and the second end of the relay detection sub-circuit is connected with the processing component;
the battery module detection sub-circuit, the first end of battery module detection sub-circuit with battery module's anodal is connected, the second end of battery module detection sub-circuit with processing assembly is connected.
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 high voltage detection circuit as claimed in any one of claims 1 to 13.
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, characterized by being applied to the high voltage detection circuit as claimed in claim 1 or 13, comprising the steps of:
collecting a first voltage signal through the relay detection sub-circuit;
collecting a current signal through the current detection subcircuit;
collecting a second voltage signal through the battery module detection sub-circuit;
determining the actual opening and closing states of the relay to be detected according to the first voltage signal, the current signal and the second voltage signal;
detecting that the relay to be detected breaks down when the theoretical opening and closing state of the relay to be detected is different from the actual opening and closing state;
and detecting that the relay to be detected is normal when the theoretical opening and closing state of the relay to be detected is the same as the actual opening and closing state.
18. The high-voltage detection method according to claim 17, wherein detecting that the relay to be detected has failed when a theoretical open-close state of the relay to be detected is different from the actual open-close state comprises:
when the theoretical opening and closing state is a closing state and the actual opening and closing state is an opening state, detecting that the relay to be detected has an open-circuit fault;
And detecting that the relay to be detected has adhesion failure when the theoretical opening and closing state is an opening state and the actual opening and closing state is a closing state.
19. The method of claim 17, wherein determining the actual open/closed state of the relay to be detected based on the first voltage signal, the current signal, and the second voltage signal comprises:
obtaining the outer voltage of the relay to be detected according to the first voltage signal;
and when the current signal is 0 and/or the external voltage is 0, determining that the actual opening and closing state of the relay to be detected is an opening state.
20. The method of claim 17, wherein determining the actual open/closed state of the relay to be detected based on the first voltage signal, the current signal, and the second voltage signal comprises:
obtaining the outer voltage of the relay to be detected according to the first voltage signal;
acquiring the positive voltage of the battery module according to the second voltage signal;
obtaining the difference between the inner side pressure and the outer side pressure of the relay to be detected according to the outer side voltage of the relay to be detected and the positive voltage of the battery module;
When the internal and external side pressure difference is smaller than or equal to the conduction voltage drop of the relay to be detected, determining that the actual opening and closing state of the relay to be detected is a closed state;
and when the internal and external side pressure difference is smaller than or equal to the conduction voltage drop and the current signal is not 0, determining that the actual opening and closing state of the relay is a closed state.
21. The high voltage detection method according to claim 20, characterized in that the method further comprises:
and obtaining the product of the current signal and the contact resistance of the relay to be detected to serve as the conduction voltage drop of the relay to be detected.
22. The method for detecting high voltage according to claim 20 or 21, wherein,
when the relay to be detected is a pre-charging relay, the contact resistance of the relay to be detected is the sum of the internal resistance and the pre-charging resistance of the pre-charging relay; or,
when the relay to be detected is other relays to be detected except the pre-charging relay, the internal resistance of the contact of the relay to be detected is the internal resistance of the relay to be detected.
23. 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 22.
CN201710992287.4A 2017-10-23 2017-10-23 High voltage detection circuit and method, detector, battery system, vehicle and computer readable storage medium Active CN107797054B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202311728794.9A CN117723958A (en) 2017-10-23 2017-10-23 High voltage detection circuit and method, detector, system, vehicle and medium
CN201710992287.4A CN107797054B (en) 2017-10-23 2017-10-23 High voltage detection circuit and method, detector, battery system, vehicle and computer readable storage medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710992287.4A CN107797054B (en) 2017-10-23 2017-10-23 High voltage detection circuit and method, detector, battery system, vehicle and computer readable storage medium

Related Child Applications (1)

Application Number Title Priority Date Filing Date
CN202311728794.9A Division CN117723958A (en) 2017-10-23 2017-10-23 High voltage detection circuit and method, detector, system, vehicle and medium

Publications (2)

Publication Number Publication Date
CN107797054A CN107797054A (en) 2018-03-13
CN107797054B true CN107797054B (en) 2024-01-30

Family

ID=61533721

Family Applications (2)

Application Number Title Priority Date Filing Date
CN202311728794.9A Pending CN117723958A (en) 2017-10-23 2017-10-23 High voltage detection circuit and method, detector, system, vehicle and medium
CN201710992287.4A Active CN107797054B (en) 2017-10-23 2017-10-23 High voltage detection circuit and method, detector, battery system, vehicle and computer readable storage medium

Family Applications Before (1)

Application Number Title Priority Date Filing Date
CN202311728794.9A Pending CN117723958A (en) 2017-10-23 2017-10-23 High voltage detection circuit and method, detector, system, vehicle and medium

Country Status (1)

Country Link
CN (2) CN117723958A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109116227A (en) * 2018-09-21 2019-01-01 深圳市科列技术股份有限公司 A kind of the main relay detection circuit and detection method of battery management system
CN109782159B (en) * 2019-02-25 2020-10-16 宁德时代新能源科技股份有限公司 High-voltage detection circuit and detection method thereof

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11159906A (en) * 1997-11-27 1999-06-15 Matsushita Electric Ind Co Ltd Absorption heat pump system
CN101571572A (en) * 2009-06-02 2009-11-04 奇瑞汽车股份有限公司 Detection device and detection method for state of relay contact in automotive high voltage circuit
CN203902308U (en) * 2014-06-11 2014-10-29 苏州市京达环卫设备有限公司 Vehicle control system and vehicle structure of pure electric vehicle
CN203995725U (en) * 2014-08-13 2014-12-10 安徽江淮汽车股份有限公司 A kind of battery pack internal electric interlock circuit
KR20150083739A (en) * 2014-01-10 2015-07-20 주식회사 엘지화학 Apparatus and method for preventing damage of precharge resistance and relay
CN105633486A (en) * 2015-12-25 2016-06-01 北京新能源汽车股份有限公司 High-voltage box of battery system, battery system and vehicle
CN106019163A (en) * 2016-05-23 2016-10-12 重庆长安汽车股份有限公司 Self-check method, device and system of high-voltage loop of power battery
CN106124980A (en) * 2016-08-09 2016-11-16 潍柴动力股份有限公司 The electrokinetic cell major loop relay fault detecting circuit of a kind of electric automobile and detection method thereof
CN106427619A (en) * 2016-09-22 2017-02-22 奇瑞汽车股份有限公司 Battery system, electrifying method and device
CN106501712A (en) * 2016-11-02 2017-03-15 天津市捷威动力工业有限公司 A kind of battery management system relay adhesion diagnostic method
CN106546915A (en) * 2016-10-27 2017-03-29 简式国际汽车设计（北京）有限公司 A kind of high-voltage relay adhesion state detection circuit and system
CN206460147U (en) * 2017-01-06 2017-09-01 深圳市核达中远通电源技术有限公司 Contacts status on-line real-time measuremen circuit in a kind of high tension loop
CN107253439A (en) * 2017-06-29 2017-10-17 科力远混合动力技术有限公司 The precharge control circuit and control method of hybrid power vehicle high voltage system
CN207336618U (en) * 2017-10-23 2018-05-08 宁德时代新能源科技股份有限公司 High-voltage detecting circuit, detector, battery system and delivery vehicle

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150028095A (en) * 2013-09-05 2015-03-13 주식회사 엘지화학 Apparatus and method for calculating precharge resistor of battery pack
CN203537035U (en) * 2013-09-30 2014-04-09 宁德时代新能源科技有限公司 Pre-charging/discharging device of energy storage system

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11159906A (en) * 1997-11-27 1999-06-15 Matsushita Electric Ind Co Ltd Absorption heat pump system
CN101571572A (en) * 2009-06-02 2009-11-04 奇瑞汽车股份有限公司 Detection device and detection method for state of relay contact in automotive high voltage circuit
KR20150083739A (en) * 2014-01-10 2015-07-20 주식회사 엘지화학 Apparatus and method for preventing damage of precharge resistance and relay
CN203902308U (en) * 2014-06-11 2014-10-29 苏州市京达环卫设备有限公司 Vehicle control system and vehicle structure of pure electric vehicle
CN203995725U (en) * 2014-08-13 2014-12-10 安徽江淮汽车股份有限公司 A kind of battery pack internal electric interlock circuit
CN105633486A (en) * 2015-12-25 2016-06-01 北京新能源汽车股份有限公司 High-voltage box of battery system, battery system and vehicle
CN106019163A (en) * 2016-05-23 2016-10-12 重庆长安汽车股份有限公司 Self-check method, device and system of high-voltage loop of power battery
CN106124980A (en) * 2016-08-09 2016-11-16 潍柴动力股份有限公司 The electrokinetic cell major loop relay fault detecting circuit of a kind of electric automobile and detection method thereof
CN106427619A (en) * 2016-09-22 2017-02-22 奇瑞汽车股份有限公司 Battery system, electrifying method and device
CN106546915A (en) * 2016-10-27 2017-03-29 简式国际汽车设计（北京）有限公司 A kind of high-voltage relay adhesion state detection circuit and system
CN106501712A (en) * 2016-11-02 2017-03-15 天津市捷威动力工业有限公司 A kind of battery management system relay adhesion diagnostic method
CN206460147U (en) * 2017-01-06 2017-09-01 深圳市核达中远通电源技术有限公司 Contacts status on-line real-time measuremen circuit in a kind of high tension loop
CN107253439A (en) * 2017-06-29 2017-10-17 科力远混合动力技术有限公司 The precharge control circuit and control method of hybrid power vehicle high voltage system
CN207336618U (en) * 2017-10-23 2018-05-08 宁德时代新能源科技股份有限公司 High-voltage detecting circuit, detector, battery system and delivery vehicle

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
吴津宇 等.商用电动汽车快充系统故障诊断和排除.《内燃机与配件》.2021,(第1期),120-121. *
易小彪.浅析电动汽车直流充电的工作原理及故障检修.《汽车维护与修理》.2022,(第11期),65-68. *

Also Published As

Publication number Publication date
CN107797054A (en) 2018-03-13
CN117723958A (en) 2024-03-19

Similar Documents

Publication Publication Date Title
EP3518382B1 (en) Power supply system
US9647301B2 (en) Battery monitoring apparatus
US10768239B2 (en) Battery system with a voltage equalizing circuit
CN207336618U (en) High-voltage detecting circuit, detector, battery system and delivery vehicle
CN107918046B (en) Current detection device and battery management system
CN106772012B (en) Relay fault diagnosis circuit and method
EP3073604B1 (en) Storage battery unit, overcurrent control method, and program
CN103576046A (en) Storage battery system having storage battery protector and diagnostic device, and diagnostic method thereof
US20080297303A1 (en) Electrical disconnect system
EP1734634A2 (en) A chargeable-and-dischargeable power supply system
CN107797054B (en) High voltage detection circuit and method, detector, battery system, vehicle and computer readable storage medium
CN105527535A (en) DC leakage insulation detection system and method based on variable-resistor network
US10545185B2 (en) Apparatus and method for diagnosing current sensor
EP4123787A1 (en) Management device and power supply system
EP3790150A1 (en) Apparatus and method for battery module balancing
WO2019093667A1 (en) Relay diagnosis circuit
CN107782950B (en) High voltage detection circuit and method, detector, battery system, vehicle and computer readable storage medium
CN115372792A (en) Fault detection method of battery equalization circuit and battery equalization circuit
CN211018294U (en) Charge control device, battery management system, and battery pack
US9864014B2 (en) System and method for assessing voltage threshold detecting circuitry within a battery pack
US20220368148A1 (en) Error Detecting Method of Charging Switch Unit and Battery System Using the Same
CN107607778B (en) Current detection circuit and method in battery high-voltage loop, detector, battery device, carrier and computer storage readable medium
KR20160059803A (en) Apparatus and method for detecting disconnection of wire in battery management system
CN107621565B (en) High voltage detection circuit, detector, battery device and vehicle
CN216285582U (en) Fault detection device for charge/discharge circuit, charging device, and vehicle

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant