CN108196176B - Insulation detection alarm device and method for battery pack - Google Patents
Insulation detection alarm device and method for battery pack Download PDFInfo
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- CN108196176B CN108196176B CN201810171015.2A CN201810171015A CN108196176B CN 108196176 B CN108196176 B CN 108196176B CN 201810171015 A CN201810171015 A CN 201810171015A CN 108196176 B CN108196176 B CN 108196176B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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Abstract
The invention provides an insulation detection alarm device. The insulation detection alarm device comprises: the alternating current power supply is used for generating an alternating current signal, and one end of the alternating current power supply is grounded; one end of the constant resistor is connected with the other end of the alternating current power supply in series; the constant value capacitor is used for isolating the direct current voltage of the battery pack and is connected with the other end of the constant value resistor in series; the selection module is used for selectively connecting the constant value capacitor in series to the positive electrode or the negative electrode of the battery pack; the control module is coupled with the alternating current power supply and controls the alternating current power supply to generate an alternating current signal; the control module is coupled with the selection module and controls the selection module to selectively connect the constant value capacitor in series to the positive pole or the negative pole of the battery pack; the control module detects the voltage of a voltage acquisition point between the fixed value resistor and the fixed value capacitor and calculates an accessed insulation resistance value based on the voltage value of the voltage acquisition point so as to judge whether the battery pack is in a leakage state; and an alarm module, the control module coupled to the alarm module and responsive to a leakage state controlling the alarm module to emit a warning signal.
Description
Technical Field
The invention relates to a pure electric vehicle power system, in particular to an insulation detection alarm device and method for a pure electric vehicle battery pack.
Background
With the aggravation of global environmental problems, the pure electric vehicle is taken as a new energy transportation tool, and the requirements of users on convenience and no pollution in the aspects of travel are completely met. Because the car of high-speed operation needs very big mechanical energy as the power source, and pure electric vehicles adopts power battery to drive mechanical braking, consequently current biography electric vehicles all has the battery package that voltage is higher as driving system, because the metal framework of automobile body is the good conductor of electricity, if the battery package of high voltage has the electric leakage condition, then whole automobile body all can be electrified, not only influence the vehicle operation and influence user's safety even, consequently it is the indispensable function of pure electric vehicles to carry out insulating nature detection to pure electric vehicles's driving system.
At present, there are many insulation detection methods for high-voltage battery packs, and the most common methods include a balanced bridge method and a low-frequency injection method. The balance bridge method can be only carried out in the non-charging and non-discharging states of the battery pack, and the battery pack must be communicated at high voltage, so that the safety and the practicability are poor; the low-frequency injection method can effectively measure the insulation resistance in real time under various working conditions, and has the defects that the measured resistance is the parallel equivalent value of the positive and negative electrode insulation resistance to the ground of the battery pack, the independent insulation resistance to the ground of the positive and negative electrodes cannot be measured independently, and only one value of the positive and negative electrode insulation resistance to the ground of the battery pack can be measured in a high-voltage power-off state (such as MSD disconnection) of the battery pack. In fact, the insulation between the positive and negative electrodes of the battery pack to ground is different in level, and even if the positive and negative electrodes of the battery pack leak electricity at the same time, it is necessary to detect the insulation resistance values between the positive and negative electrodes of the battery pack to ground separately.
In order to solve the problems, the invention provides an insulation detection device and method of a battery pack, which can realize the independent measurement of the insulation resistance of the positive electrode and the negative electrode of the battery pack; meanwhile, the insulation state can be comprehensively detected during the maintenance of the power failure of the battery pack, an alarm signal is timely generated, and a series of control signals are adopted to fulfill the aim of comprehensively protecting the safety of personnel.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide an insulation detection alarm device and an insulation detection alarm method of a battery pack suitable for a pure electric vehicle.
According to an aspect of the present invention, there is provided an insulation detection alarm device including: the alternating current power supply is used for generating an alternating current signal, and one end of the alternating current power supply is grounded; one end of the constant resistor is connected with the other end of the alternating current power supply in series; the constant value capacitor is used for isolating the direct current voltage of the battery pack and is connected with the other end of the constant value resistor in series; the selection module is used for selectively connecting the constant value capacitor in series to the positive electrode or the negative electrode of the battery pack; the control module is coupled with the alternating current power supply and controls the alternating current power supply to generate an alternating current signal; the control module is coupled with the selection module and controls the selection module to selectively connect the constant value capacitor in series to the positive pole or the negative pole of the battery pack; the control module detects the voltage of a voltage acquisition point between the fixed value resistor and the fixed value capacitor and calculates an accessed insulation resistance value based on the voltage value of the voltage acquisition point so as to judge whether the battery pack is in a leakage state; and an alarm module, the control module coupled to the alarm module and responsive to a leakage state controlling the alarm module to emit a warning signal.
Further, the control module controls the selection module to serially connect the fixed value capacitor to either the positive pole or the negative pole of the battery pack when the battery pack is in the working state so as to calculate the parallel connection value of the insulation resistance of the positive pole of the battery pack to the ground and the insulation resistance of the negative pole of the battery pack to the ground; and the control module judges that the battery pack is in a parallel connection electric leakage state based on the condition that the parallel connection value of the insulation resistance of the positive pole of the battery pack to the ground and the insulation resistance of the negative pole of the battery pack to the ground is smaller than a preset threshold value.
Furthermore, the control module controls the selection module to connect the constant-value capacitor in series with the positive electrode of the battery pack when the battery pack is in a non-working state so as to calculate the insulation resistance value of the positive electrode of the battery pack to the ground; and the control module judges that the battery pack is in the anode leakage state based on the fact that the insulation resistance value of the anode of the battery pack to the ground is smaller than a preset threshold value.
Furthermore, the control module controls the selection module to connect the constant-value capacitor in series with the negative electrode of the battery pack when the battery pack is in a non-working state so as to calculate the insulation resistance value of the negative electrode of the battery pack to the ground; and the control module judges that the battery pack is in a negative electrode electricity leakage state based on the fact that the insulation resistance value of the negative electrode of the battery pack to the ground is smaller than a preset threshold value.
Further, the control module controls the alarm module to send out a first warning signal in response to the parallel leakage state; or the alarm module is controlled to send out a second warning signal in response to the anode leakage state; or the alarm module is controlled to send out a third warning signal in response to the negative electrode leakage state.
Furthermore, the first warning signal, the second warning signal and the third warning signal are sound signals with different frequencies and/or light signals with different colors.
Further, the control module is coupled with the vehicle control unit and sends information to the vehicle control unit based on the parallel leakage state; the vehicle control unit responds to the parallel leakage state, sends a reminding message through the display screen to remind a user that the battery pack is in the leakage state and is to be restarted after next parking and maintenance, and generates a control signal to prohibit the vehicle from being started after the pure electric vehicle stops.
Further, the control module is coupled with the vehicle control unit and sends information to the vehicle control unit based on the anode leakage state; and the vehicle control unit responds to the anode leakage state, sends a reminding message through the display screen to remind a user that the battery pack is in the anode leakage state and is prohibited from starting, and generates a control signal to prohibit the vehicle from starting.
Further, the control module is coupled with the vehicle control unit and sends information to the vehicle control unit based on the negative electrode leakage state; the vehicle control unit responds to the negative electrode leakage state, sends a reminding message through the display screen to remind a user that the battery pack is in the negative electrode leakage state and is forbidden to start, and generates a control signal to forbid the vehicle to start.
Furthermore, the insulation detection alarm device further comprises a standby power supply, and when the pure electric vehicle is in a parking power-off condition, the standby power supply supplies power to other modules so as to realize periodic insulation detection.
Furthermore, the insulation detection alarm device further comprises a fuse, and the fuse is connected between the selection module and the positive electrode of the battery pack in series for protecting a circuit.
Furthermore, the voltage of the alternating current signal is 3-48V, and the frequency is 0.1-10 Hz.
Further, the selection module is a selection switch.
According to an aspect of the present invention, an insulation detection alarm method applied to the insulation detection alarm apparatus includes controlling an ac power source to generate an ac signal; controlling the selection module to selectively connect the fixed-value capacitor in series to the positive electrode or the negative electrode of the battery pack; detecting the voltage of a voltage acquisition point between the fixed value resistor and the fixed value capacitor and calculating an accessed insulation resistance value based on the voltage value of the voltage acquisition point so as to judge whether the battery pack is in a leakage state; the alarm module is controlled to send out a warning signal in response to the electric leakage state.
Further, the selection module is controlled to connect the constant-value capacitor in series with one of the positive pole or the negative pole of the battery pack in response to the battery pack being in the working state so as to calculate the parallel connection value of the insulation resistance of the positive pole of the battery pack to the ground and the insulation resistance of the negative pole of the battery pack to the ground; and judging that the battery pack is in a parallel leakage state based on the fact that the parallel value of the insulation resistance of the positive pole of the battery pack to the ground and the insulation resistance of the negative pole of the battery pack to the ground is smaller than a preset threshold value.
Further, the selection module is controlled to serially connect the constant value capacitor to the positive electrode of the battery pack in response to the non-working state of the battery pack so as to calculate the insulation resistance value of the positive electrode of the battery pack to the ground; and judging that the battery pack is in an anode leakage state based on the fact that the insulation resistance value of the anode of the battery pack to the ground is smaller than a preset threshold value.
Further, the selection module is controlled to serially connect the constant value capacitor to the negative electrode of the battery pack in response to the fact that the battery pack is in a non-working state so as to calculate the insulation resistance value of the negative electrode of the battery pack to the ground; and judging that the battery pack is in a negative electrode leakage state based on the fact that the insulation resistance value of the negative electrode of the battery pack to the ground is smaller than a preset threshold value.
Further, the alarm module is controlled to send out a first warning signal in response to the parallel leakage state; or the alarm module is controlled to send out a second warning signal in response to the anode leakage state; or the alarm module is controlled to send out a third warning signal in response to the negative electrode leakage state.
Furthermore, the first warning signal, the second warning signal and the third warning signal are sound signals with different frequencies and/or light signals with different colors.
Furthermore, a reminding message is sent through the display screen in response to the parallel connection leakage state to remind a user that the battery pack is in the leakage state and will be started again after the battery pack is stopped and overhauled next time, and a control signal is generated to prohibit the vehicle from being started after the pure electric vehicle is stopped.
Further, a prompting message is sent through the display screen in response to the anode leakage state to prompt a user that the battery pack is in the anode leakage state and forbids starting, and a control signal is generated to forbid starting of the vehicle.
Further, a warning message is sent through the display screen in response to the negative leakage state to warn a user that the battery pack is in the negative leakage state to prohibit starting, and a control signal is generated to prohibit starting of the vehicle.
Further, in response to the pure electric vehicle being in a parking power-off condition, the standby power supply is adopted to supply power to other modules so as to complete periodic insulation detection.
Furthermore, the voltage of the alternating current signal is 3-48V, and the frequency is 0.1-10 Hz.
Drawings
The above features and advantages of the present disclosure will be better understood upon reading the detailed description of embodiments of the disclosure in conjunction with the following drawings.
FIG. 1 is a schematic view of an insulation detection alarm apparatus of an embodiment;
FIG. 2 is an insulation detection equivalent circuit diagram of an embodiment;
FIG. 3 is a flow chart of an insulation detection alarm method according to an embodiment.
For clarity, a brief description of the reference numerals is given below:
10 Battery pack
100 insulation detection device
110 AC power supply
120 control module
130 constant value resistance
140 constant value capacitor
150 selection module
160 alarm module
170 voltage collection point
180 fuse
RPInsulation resistance of positive electrode of battery pack to ground
RNInsulation resistance of battery pack negative electrode to ground
RPNParallel resistance of insulation resistance of positive pole of battery pack to ground and insulation resistance of negative pole of battery pack to ground
R0Resistance value of constant value resistor
Capacitance value of C constant value capacitor
S310-S3532 steps
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. It is noted that the aspects described below in connection with the figures and the specific embodiments are only exemplary and should not be construed as imposing any limitation on the scope of the present invention.
In order to solve the defect that the existing low-frequency injection method can only detect the insulation resistance of a single electrode and the insulation resistance connected in parallel, the scheme adopts the additional arrangement of a selection module and a bypass to achieve the purpose of detecting the insulation resistance of two electrodes of a positive electrode and a negative electrode to the ground.
In one embodiment of the present invention, as shown in fig. 1, a pure electric vehicle (not shown) includes a battery pack 10 as a power system, wherein the insulation resistance of the positive electrode of the battery pack to the ground is RPThe insulation resistance of the negative electrode to the ground is RN. The insulation detection device 100 includes an ac power source 110, a control module 120, a detection resistor 130, a fixed value capacitor 140, a selection module 150, and an alarm module 160. One end of the ac power source 110 is grounded, and the other end is coupled to one end of the detection resistor 130; the other end of the detection resistor 130 is coupled to one end of the fixed capacitor 140, and the other end of the fixed capacitor 140 is connected in series to the 1-terminal of the selection module 150; the 2 terminal of the selection module 150 is coupled to the positive electrode of the battery pack, and the 3 terminal of the selection module 150 is coupled to the negative electrode of the battery pack; the control module 120 is coupled to the ac power source 110 and the control terminal of the selection module 150.
When the insulation detecting device 100 is started, the control module 120 controls the ac power source 110 to generate an ac signal; the control module 120 controls the selection module 150 to selectively connect the fixed-value capacitor in series to the positive electrode or the negative electrode of the battery pack; the control module 120 detects the voltage of the voltage collecting point between the fixed value resistor 130 and the fixed value capacitor 140 for calculating the insulation resistance value of the access and judging whether the battery pack is in a leakage state based on the insulation resistance value; the control module controls the alarm module 160 to issue a warning signal in response to the electrical leakage condition.
In the insulation detection circuit, the ac power source 110, the fixed resistor 130, the fixed capacitor 140, the selection module 150, and the insulation resistors R1 and/or R2 form a loop.
Further, when the battery pack 10 is in an operating state, that is, the battery pack is in a charging or discharging state, in the insulation detection circuit, since the ac power source 110 is used, the battery pack 10 is equivalent to a conducting wire, and the insulation detection circuit is equivalent to the equivalent circuit shown in fig. 2 no matter whether the selection module 150 selects to turn on the terminals 1 and 2 or the terminals 1 and 3.
As shown in FIG. 2, an input voltage signal U of the AC power sourceSWhile the voltage value of the voltage collecting point 170 is UmAfter a delay (generally within 1 s), the voltage value of the voltage collecting point 170 will gradually return to U due to the existence of the constant value capacitor 140SAccording to the voltage value U of the voltage acquisition pointmAnd output voltage value U of AC power supplySCan calculate RPNThe calculation formula is as follows:
RPN＝R0*Um/(Us-Um) (1)
wherein R is0Is the resistance value of a constant value resistor, UmIs the voltage value of the voltage acquisition point 170, USIs the value of the output voltage of the ac power source 120.
Further, the control module calculates the parallel resistance value R calculated by the formula (1)PNComparing with a preset threshold value R, when the parallel resistance value R calculated by the formula (1)PNIf the current is smaller than the preset threshold R, it is determined as a parallel leakage state, and the control module 120 controls the alarm module 160 to send a first warning signal based on the parallel leakage state.
The preset threshold R satisfies: r is epsilon min (R)P,RN) Wherein R isP、RNThe positive electrode insulation resistance value to ground and the negative electrode insulation resistance value to ground of the battery pack 10 are respectively set when no leakage occurs.
Further, when the battery pack 10 is in a non-operating state, that is, the pure electric vehicle is in a parking state, the control module 120 controls the selection module 150 to perform line selection, that is, the 1 end and the 2 end or the 1 end and the 3 end of the selection module 150 are switched on to select the positive electrode or the negative electrode of the battery pack 10 to be connected to the detection line to detect the positive electrode insulation resistance RPOr negative insulation resistance RN. Positive electrode insulation resistance RPOr negative insulation resistance RNThe calculation formula (2) is not substantially different from the formula (1), but R is onlyPNIs replaced by RPOr RNAnd will not be described in detail. The control module 120 calculates the positive insulation resistance R based onPOr negative insulation resistance RNAnd judging whether the battery pack is in a positive electrode or negative electrode leakage state or not according to the relation with a preset threshold value R.
When the battery pack is in the positive leakage state, the control module 120 controls the alarm module 160 to send out a second warning signal.
When the battery pack is in a negative leakage state, the control module 120 controls the alarm module 160 to send out a third warning signal.
Preferably, the first warning signal, the second warning signal and the third warning signal are sound signals with different frequencies and/or light signals with different colors.
In one embodiment, the time required to complete the detection of the insulation resistance of the positive electrode and the negative electrode to the ground once is one detection period. Then in a single test cycle, when there is only the calculated positive insulation resistance RPWhen the current value is smaller than the preset threshold value R, the control module 120 determines that the battery pack 10 is in the positive electrode leakage state, and controls the alarm module 160 to send out a second alarm signal; when only the calculated insulation resistance R of the negative electrode existsNWhen the current is smaller than the preset threshold R, the control module 120 determines that the current is in the negative leakage state, and controls the alarm module 160 to send a third warning signal; when the calculated positive insulation resistance RPAnd a negative insulation resistance RNWhen both are smaller than the preset threshold R, the control module 120 determines that the current leakage state is both positive and negative, and controls the alarm module 160 to send out a fourth warning signal.
In one embodiment, the control module 120 communicates with the vehicle control unit when the calculated parallel resistance value R is obtainedPNWhen the current value is smaller than the preset threshold value R, the current leakage state is judged to be in a parallel connection state, the control module 120 sends information to the vehicle control unit based on the parallel connection state, the vehicle control unit controls a display screen to display a reminding message to remind a user that the automobile battery pack has electric leakage, the vehicle control unit is forbidden to start after the next parking, needs to be overhauled as soon as possible, and sends a control signal to forbid the vehicle to start after the next parking.
It can be understood that when the operating state of the battery pack 10 is the charging state, the vehicle is obviously in the prohibition state, and the vehicle controller can send the control signal to prohibit the vehicle from starting without waiting for the next stop.
When the battery pack 10 is in the anode leakage state, the control module 120 sends information to the vehicle control unit, and the vehicle control unit prohibits starting of the vehicle and controls a display message on the display screen to remind a user that the battery pack is in the anode leakage state, needs to be overhauled and prohibits starting; when the battery pack 10 is in the negative electrode leakage state, the control module 120 sends information to the vehicle control unit, and the vehicle control unit prohibits the vehicle from starting and controls a display message on the display screen to remind a user that the battery pack is in the negative electrode leakage state, needs to be overhauled and prohibits starting; when the battery pack 10 is in the state of both positive and negative leakage, the control module 120 sends information to the vehicle controller, and the vehicle controller prohibits the vehicle from starting and controls the display screen to display a message to remind the user that the battery pack is in the state of both positive and negative leakage, needs to be overhauled, and prohibits starting.
It is understood that the inhibiting of vehicle activation includes inhibiting the battery pack from accessing the operating circuit, disconnecting the battery pack from the internal connection, or inhibiting the accelerator pedal from braking, and the like as would occur to those skilled in the art.
Further, since the power supply voltage of the common electronic device is 3-48V, the voltage of the ac power supply is generally 3-48V.
Further, the frequency of the ac signal generated by the ac power supply is generally set to 0.1 to 10Hz, and for convenience of calculation, the voltage value is detected every 1s or 2s, and is more preferably set to 0.5Hz or 1 Hz.
In one embodiment, the selection module 150 is a selection switch.
In an embodiment, a fuse 180 is connected in series between the end of the selection module 2 and the positive electrode of the battery pack 10, so as to prevent the battery pack from short circuit caused by short circuit between the end of the selection module 2 and the end 3, and when the current flowing through the fuse 180 is greater than a certain threshold, the fuse 180 is automatically opened, thereby playing a role of protecting a circuit. The fuse 180 impedance is very small and negligible in the calculation.
In one embodiment, the insulation detecting apparatus 100 includes a backup power source (not shown), and when the pure electric vehicle is in a long-term parking state, that is, the entire vehicle is in a parking state, the backup power source is activated to implement periodic insulation detection at a low frequency (e.g., every hour, every day, every half month, etc.). When the battery pack of the pure electric vehicle is in the anode and/or cathode leakage state, a warning signal such as a whistle, a flashing light and the like is sent out.
According to one aspect of the invention, an insulation detection alarm method suitable for a battery pack of a pure electric vehicle is provided. In one embodiment, as shown in FIG. 3, the method includes:
s310: initializing the device, and inputting an alternating current signal to an insulation detection line;
s320: and selectively connecting the constant-value capacitor in series to the positive electrode or the negative electrode of the battery pack.
S330: and detecting the voltage of a voltage acquisition point between the constant value resistor and the constant value capacitor, and calculating the insulation resistance value of the accessed detection circuit based on the voltage value of the voltage acquisition point.
S340: judging whether the battery pack is in a leakage state or not based on the calculated insulation resistance value;
s350: and if the battery pack is in a leakage state, the alarm module is controlled to send out an alarm signal.
In one embodiment, this step 320 can be refined as:
321: when the battery pack is in a working state, the constant-value capacitor is connected in series to either the positive electrode or the negative electrode of the battery pack;
322: when the battery pack is in a non-working state, the constant-value capacitor is connected to the positive electrode of the battery pack in series;
323: when the battery pack is in a non-working state, the constant-value capacitor is connected to the negative electrode of the battery pack in series;
further, the formula for calculating the insulation resistance value in step S330 is RPN＝R0*Um/(Us-Um)。
In one embodiment, the step S340 can be detailed as:
s341: corresponding to the step 321, the insulation resistance accessed to the detection circuit is a parallel connection value of the insulation resistance of the anode of the battery pack to the ground and the insulation resistance of the cathode of the battery pack to the ground, and the battery pack is judged to be in a parallel connection leakage state based on the fact that the parallel connection value of the insulation resistance of the anode of the battery pack to the ground and the insulation resistance of the cathode of the battery pack to the ground is smaller than a preset threshold value R;
s342: corresponding to the step 322, the insulation resistance accessed to the detection circuit is the insulation resistance of the anode of the battery pack to the ground, and the battery pack is judged to be in the anode leakage state based on the fact that the insulation resistance of the anode of the battery pack to the ground is smaller than a preset threshold value R;
s343: corresponding to step 323, the insulation resistance of the access detection circuit is the insulation resistance of the negative electrode of the battery pack to the ground, and the battery pack is judged to be in the negative electrode leakage state based on the fact that the insulation resistance of the negative electrode of the battery pack to the ground is smaller than a preset threshold value R.
In one embodiment, the step S350 can be detailed as:
s3511: corresponding to step 321, in response to the parallel leakage state, a first warning signal is issued;
s3521: corresponding to step 322, in response to the positive electrode leakage condition, issuing a second warning signal;
s3531: corresponding to step 323, in response to the negative leakage state, a third warning signal is issued;
in one embodiment, step S350 further includes:
s3512: the method comprises the steps that information is sent to a vehicle control unit, the vehicle control unit displays reminding information on a display screen to remind a user that a battery pack is in a parallel connection leakage state, needs to be overhauled, and is prohibited to be started after parking, and sends a control signal to prohibit the vehicle from being started after next parking;
s3522: sending information to a vehicle control unit, wherein the vehicle control unit displays reminding information on a display screen to remind a user that a battery pack is in a positive electrode leakage state, needs to be overhauled and is prohibited from being started, and sends a control signal to prohibit the vehicle from being started;
s3532: and sending information to the vehicle control unit, wherein the vehicle control unit displays reminding information on a display screen to remind a user that the battery pack is in a negative electrode electricity leakage state, needs to be overhauled and is prohibited from starting, and sends a control signal to prohibit the vehicle from starting.
Those of skill in the art would understand that information, signals, and data may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits (bits), symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The various illustrative logical modules, and circuits described in connection with the embodiments disclosed herein may be implemented or performed with a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In the alternative, the processor and the storage medium may reside as discrete components in a user terminal.
In one or more exemplary embodiments, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software as a computer program product, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a web site, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk (disk) and disc (disc), as used herein, includes Compact Disc (CD), laser disc, optical disc, Digital Versatile Disc (DVD), floppy disk and blu-ray disc where disks (disks) usually reproduce data magnetically, while discs (discs) reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.
The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. It is to be understood that the scope of the invention is to be defined by the appended claims and not by the specific constructions and components of the embodiments illustrated above. Those skilled in the art can make various changes and modifications to the embodiments within the spirit and scope of the present invention, and these changes and modifications also fall within the scope of the present invention.
Claims (24)
1. The utility model provides an insulating detection alarm device suitable for battery package of pure electric vehicles, includes:
the alternating current power supply is used for generating an alternating current signal, and one end of the alternating current power supply is grounded;
one end of the constant resistor is connected with the other end of the alternating current power supply in series;
the constant value capacitor is used for isolating the direct current voltage of the battery pack and is connected with the other end of the constant value resistor in series;
the selection module is used for selectively connecting the constant value capacitor in series to the positive electrode or the negative electrode of the battery pack;
the control module is coupled with the alternating current power supply and controls the alternating current power supply to generate an alternating current signal; the control module is coupled with the selection module and controls the selection module to selectively connect the constant value capacitor in series to the positive pole or the negative pole of the battery pack; the control module detects the voltage of a voltage acquisition point between the fixed value resistor and the fixed value capacitor and calculates an accessed insulation resistance value based on the voltage value of the voltage acquisition point so as to judge whether the battery pack is in a leakage state; and
an alarm module, the control module coupled to the alarm module and responsive to a leakage state to control the alarm module to emit a warning signal.
2. The insulation detection alarm device according to claim 1, wherein the control module controls the selection module to connect the constant value capacitor in series to either one of a positive pole or a negative pole of the battery pack when the battery pack is in an operating state to calculate a parallel value of an insulation resistance of the positive pole of the battery pack to ground and an insulation resistance of the negative pole of the battery pack to ground; and
the control module judges that the battery pack is in a parallel connection electric leakage state based on the fact that the parallel connection value of the insulation resistance of the positive pole of the battery pack to the ground and the insulation resistance of the negative pole of the battery pack to the ground is smaller than a preset threshold value.
3. The insulation detection alarm device according to claim 1, wherein the control module controls the selection module to serially connect the constant-value capacitor with the positive electrode of the battery pack to calculate the insulation resistance value of the positive electrode of the battery pack to the ground when the battery pack is in a non-working state; and
the control module judges that the battery pack is in an anode leakage state based on the fact that the insulation resistance value of the anode of the battery pack to the ground is smaller than a preset threshold value.
4. The insulation detection alarm device according to claim 1, wherein the control module controls the selection module to serially connect the constant-value capacitor with the negative electrode of the battery pack to calculate the insulation resistance value of the negative electrode of the battery pack to the ground when the battery pack is in a non-working state; and
the control module judges that the battery pack is in a negative electrode electricity leakage state based on the fact that the insulation resistance value of the negative electrode of the battery pack to the ground is smaller than a preset threshold value.
5. The insulation detection warning device as claimed in claim 2, 3 or 4, wherein said control module controls said warning module to issue a first warning signal in response to a parallel leakage condition; or
Controlling the alarm module to send out a second alarm signal in response to the anode leakage state; or
And controlling the alarm module to send out a third alarm signal in response to the negative electrode leakage state.
6. An insulation detection warning device as claimed in claim 5, characterized in that the first warning signal, the second warning signal or the third warning signal are sound signals of different frequencies and/or light signals of different colours.
7. The insulation detection warning device of claim 2, wherein the control module is coupled to a vehicle controller and sends a message to the vehicle controller based on a parallel leakage state;
the vehicle control unit responds to the parallel leakage state and sends a reminding message through the display screen to remind a user that the battery pack is in the leakage state, the battery pack is restarted after next parking and overhauling, and a control signal is generated to prohibit the vehicle from being started after the pure electric vehicle stops.
8. The insulation detection warning device of claim 3, wherein the control module is coupled to a vehicle controller and sends a message to the vehicle controller based on a positive leakage state;
and the vehicle control unit responds to the anode leakage state, sends a reminding message through the display screen to remind a user that the battery pack is in the anode leakage state and is prohibited from starting, and generates a control signal to prohibit the vehicle from starting.
9. The insulation detection warning device of claim 4, wherein the control module is coupled to a vehicle control unit and sends information to the vehicle control unit based on a negative leakage state;
the vehicle control unit responds to the negative electrode leakage state, sends a reminding message through the display screen to remind a user that the battery pack is in the negative electrode leakage state and is forbidden to start, and generates a control signal to forbid the vehicle to start.
10. The insulation detection alarm device of claim 1, further comprising:
and the standby power supply is used for supplying power to other modules to complete periodic insulation detection when the pure electric automobile is in a parking state.
11. The insulation detection alarm device of claim 1, further comprising
A fuse connected in series between the selection module and the positive electrode of the battery pack for protecting a circuit.
12. The insulation detection alarm device according to claim 1, wherein the voltage of the alternating current signal is 3 to 48V and the frequency is 0.1 to 10 Hz.
13. The insulation detection alarm device of claim 1, wherein the selection module is a selection switch.
14. An insulation detection alarm method applied to the insulation detection alarm device according to claim 1, comprising
Controlling an alternating current power supply to generate an alternating current signal; controlling the selection module to selectively connect the fixed-value capacitor in series to the positive electrode or the negative electrode of the battery pack; detecting the voltage of a voltage acquisition point between the fixed value resistor and the fixed value capacitor and calculating an accessed insulation resistance value based on the voltage value of the voltage acquisition point so as to judge whether the battery pack is in a leakage state; the alarm module is controlled to send out a warning signal in response to the electric leakage state.
15. The insulation detection alarm method according to claim 14, wherein the selection module is controlled to connect the constant-value capacitor in series with one of a positive electrode or a negative electrode of the battery pack in response to the battery pack being in the working state to calculate a parallel connection value of an insulation resistance of the positive electrode of the battery pack to the ground and an insulation resistance of the negative electrode of the battery pack to the ground; and
and judging that the battery pack is in a parallel connection leakage state based on the condition that the parallel connection value of the insulation resistance of the positive pole of the battery pack to the ground and the insulation resistance of the negative pole of the battery pack to the ground is smaller than a preset threshold value.
16. The insulation detection alarm method according to claim 14, wherein the selection module is controlled to connect the fixed-value capacitor in series to the positive electrode of the battery pack in response to the battery pack being in a non-operating state to calculate the insulation resistance value of the positive electrode of the battery pack to the ground; and
and judging that the battery pack is in the anode leakage state based on the condition that the insulation resistance value of the anode of the battery pack to the ground is smaller than a preset threshold value.
17. The insulation detection alarm method according to claim 14, wherein the selection module is controlled to connect the constant value capacitor in series to the negative electrode of the battery pack in response to the battery pack being in a non-operating state to calculate the insulation resistance value of the negative electrode of the battery pack to the ground; and
and judging that the battery pack is in a negative electrode leakage state based on the condition that the insulation resistance value of the negative electrode of the battery pack to the ground is smaller than a preset threshold value.
18. The insulation detection alarm method as claimed in claim 15, 16 or 17, wherein said alarm module is controlled to issue a first alarm signal in response to a parallel leakage state; or
Controlling the alarm module to send out a second alarm signal in response to the anode leakage state; or
And controlling the alarm module to send out a third alarm signal in response to the negative electrode leakage state.
19. The insulation detection alarm method of claim 18, wherein the first warning signal, the second warning signal, or the third warning signal is a sound signal of different frequency and/or a light signal of different color.
20. The insulation detection alarm method according to claim 15, wherein a reminding message is sent through a display screen in response to the parallel leakage state to remind a user that the battery pack is in the leakage state and the battery pack will be restarted after the next parking maintenance, and a control signal is generated to prohibit the vehicle from being started after the pure electric vehicle is stopped.
21. The insulation detection alarm method of claim 16, wherein a warning message is sent via the display screen in response to the positive leakage state to alert a user that the battery pack is in the positive leakage state to disable the activation, and a control signal is generated to disable the vehicle activation.
22. The insulation detection alarm method of claim 17, wherein a reminder message is sent via the display screen in response to the negative leakage state to remind a user that the battery pack is in the negative leakage state to prohibit starting, and a control signal is generated to prohibit starting of the vehicle.
23. The insulation detection alarm method according to claim 14, wherein in response to the electric-only vehicle being parked, a backup power source is used to supply power to other modules to perform periodic insulation detection.
24. The insulation detection alarm method according to claim 14, wherein the voltage of the alternating current signal is 3 to 48V and the frequency is 0.1 to 10 Hz.
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| CN109471041B (en) * | 2019-01-08 | 2024-06-11 | 常州是为电子有限公司 | Power battery insulation impedance on-line monitoring device and method |
| CN110967607A (en) | 2019-01-15 | 2020-04-07 | 宁德时代新能源科技股份有限公司 | Insulation detection circuit, method and battery management system |
| CN109917294A (en) * | 2019-03-25 | 2019-06-21 | 深圳艾威仕汽车检测设备有限公司 | Vehicle battery electric leakage monitoring method based on big data analysis |
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| JP5926677B2 (en) * | 2012-12-27 | 2016-05-25 | 日立オートモティブシステムズ株式会社 | Ground fault detector |
| CN104142433A (en) * | 2013-05-09 | 2014-11-12 | 中南大学 | Active type direct-current system insulation resistor detection method |
| CN104076207A (en) * | 2014-06-26 | 2014-10-01 | 天津市松正电动汽车技术股份有限公司 | Electric vehicle insulation detecting circuit |
| CN106053947A (en) * | 2016-07-11 | 2016-10-26 | 北京长城华冠汽车科技股份有限公司 | Insulation resistance detection circuit and method of electric automobile power battery, and electric automobile |
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