CN117783676A - Circuit, equipment and method for rapidly measuring insulation resistance of battery - Google Patents
Circuit, equipment and method for rapidly measuring insulation resistance of battery Download PDFInfo
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Abstract
The invention provides a circuit, equipment and a method for rapidly measuring insulation resistance of a battery, and relates to the technical field of insulation resistance detection of electric automobiles, wherein the circuit comprises: a battery voltage detection module; a first voltage detection module; a second voltage detection module; the first bleeder module is connected with the first voltage detection module in parallel; the second bleeder module is connected with the second voltage detection module in parallel; the switching module is connected with the first voltage detection module, the second voltage detection module, the first discharging module and the second discharging module; the control processing module is respectively connected with the battery voltage detection module, the first voltage detection module, the second voltage detection module and the switching module. The time consumption of the equivalent capacitance reaching a steady state can be shortened through the first discharging module and the second discharging module, quick measurement is realized, meanwhile, battery voltage fluctuation is considered, an equation is constructed to solve and obtain an anode insulation resistance value and a cathode insulation resistance value, measurement errors caused by the battery voltage fluctuation are avoided, and measurement accuracy is improved.
Description
Technical Field
The invention relates to the technical field of insulation resistance detection of electric automobiles, in particular to a circuit, equipment and a method for rapidly measuring insulation resistance of a battery.
Background
An insulation resistor exists between a power battery and the ground in the electric automobile, the detection of the insulation resistor is an important process for guaranteeing the insulation safety of the electric automobile, and the performance of the insulation resistor is directly related to the life safety of passengers. Insulation resistance detection methods used by existing automobile manufacturers are different, and insulation resistance detection precision is different.
In the existing insulation resistance measurement process, as the equivalent capacitance exists between the positive electrode and the negative electrode of the battery and the ground, the insulation resistance can be accurately measured after the charge and discharge of the equivalent capacitance reach a steady state, meanwhile, the charge and discharge time of the equivalent capacitance is also influenced by the insulation resistance, under the condition that the size of the insulation resistance is uncertain, the charge and discharge time of the equivalent capacitance is also uncertain, the steady state is generally ensured by waiting for a long time, the measurement time is longer, and if the waiting time is insufficient, the measurement deviation is extremely easy to occur, so that the measurement accuracy of the insulation resistance is reduced.
Disclosure of Invention
The invention provides a circuit, equipment and a method for rapidly measuring the insulation resistance of a battery, which are used for solving the defect of long insulation resistance measurement time of the battery in an electric automobile in the prior art and realizing rapid measurement of the insulation resistance.
The invention provides a battery insulation resistance rapid measurement circuit, which comprises:
the battery voltage detection module is used for being connected with the anode and the cathode of the battery;
the first voltage detection module is used for being connected with the negative electrode of the battery and the ground;
the second voltage detection module is used for being connected with the anode of the battery and the ground;
the first bleeder module is connected with the first voltage detection module in parallel;
the second bleeder module is connected with the second voltage detection module in parallel;
the switching module is connected with the first voltage detection module, the second voltage detection module, the first discharge module and the second discharge module;
the control processing module is respectively connected with the battery voltage detection module, the first voltage detection module, the second voltage detection module and the switching module;
the switching module comprises a first state and a second state, wherein the first state enables the first voltage detection module and the second bleeder module to be conducted and the second voltage detection module and the first bleeder module to be disconnected, and the second state enables the second voltage detection module and the first bleeder module to be conducted and the first voltage detection module and the second bleeder module to be disconnected.
According to the battery insulation resistance rapid measurement circuit provided by the invention, the switching module comprises a first switching piece, a second switching piece, a third switching piece and a fourth switching piece, wherein the first switching piece is connected with the first voltage detection module, the second switching piece is connected with the second voltage detection module, the third switching piece is connected with the first discharging module, the fourth switching piece is connected with the second discharging module, the control processing module is connected with the controlled end of the first switching piece, the controlled end of the second switching piece, the controlled end of the third switching piece and the controlled end of the fourth switching piece, and the control processing module controls the first switching piece and the fourth switching piece to be closed and the second switching piece and the third switching piece to be opened or controls the second switching piece and the third switching piece to be closed and the first switching piece and the fourth switching piece to be opened.
According to the quick measurement circuit for the insulation resistance of the battery, the first voltage detection module comprises a first voltage dividing resistor, a second voltage dividing resistor and a first voltage detection piece, one end of the first voltage dividing resistor is connected with the negative electrode of the battery, the other end of the first voltage dividing resistor is connected with one end of the second voltage dividing resistor through the first switch piece, the other end of the second voltage dividing resistor is grounded, the first voltage detection piece is connected with the first voltage dividing resistor or the second voltage dividing resistor, and the control processing module is connected with the first voltage detection piece.
According to the quick measurement circuit for the insulation resistance of the battery, the second voltage detection module comprises a third voltage dividing resistor, a fourth voltage dividing resistor and a second voltage detection piece, one end of the third voltage dividing resistor is connected with the positive electrode of the battery, the other end of the third voltage dividing resistor is connected with one end of the fourth voltage dividing resistor through the second switch piece, the other end of the fourth voltage dividing resistor is grounded, the second voltage detection piece is connected with the third voltage dividing resistor or the fourth voltage dividing resistor, and the control processing module is connected with the second voltage detection piece.
According to the battery insulation resistance rapid measurement circuit provided by the invention, the first bleeder module comprises a first bleeder resistor, one end of the first bleeder resistor is connected with the negative electrode of the battery through the third switch piece, and the other end of the first bleeder resistor is grounded.
According to the battery insulation resistance rapid measurement circuit provided by the invention, the second bleeder module comprises a second bleeder resistor, one end of the second bleeder resistor is connected with the positive electrode of the battery through the fourth switch piece, and the other end of the second bleeder resistor is grounded.
According to the battery insulation resistance rapid measurement circuit provided by the invention, the battery voltage detection module comprises a fifth voltage dividing resistor, a sixth voltage dividing resistor and a third voltage detection piece, one end of the fifth voltage dividing resistor is connected with the negative electrode of the battery, the other end of the fifth voltage dividing resistor is connected with one end of the sixth voltage dividing resistor, one end of the sixth voltage dividing resistor is connected with the positive electrode of the battery, the third voltage detection piece is connected with the fifth voltage dividing resistor or the sixth voltage dividing resistor, and the control processing module is connected with the third voltage detection piece.
According to the battery insulation resistance rapid measurement circuit provided by the invention, the battery insulation resistance rapid measurement circuit further comprises a grounding switch, wherein the first voltage detection module, the second voltage detection module, the first discharging module and the second discharging module are grounded through the grounding switch, and the control processing module is connected with a controlled end of the grounding switch.
The invention also provides measurement equipment, which comprises the battery insulation resistance rapid measurement circuit and also comprises an alarm module, wherein the control processing module is connected with the alarm module.
The invention also provides a measuring method which is applied to the battery insulation resistance rapid measuring circuit or the measuring equipment and comprises the following steps:
the control processing module controls the switching module to switch to a first state, obtains a first detection voltage of the first voltage detection module and a first battery voltage of the battery voltage detection module, and establishes a first equation related to an anode insulation resistance and a cathode insulation resistance according to the first detection voltage, a preset first resistance parameter set corresponding to the first voltage detection module, the first battery voltage, a preset second resistance parameter set corresponding to the battery voltage detection module and a preset second discharge resistance parameter corresponding to the second discharge module;
the control processing module controls the switching module to switch to a second state, acquires a second detection voltage of the second voltage detection module and a second battery voltage of the battery voltage detection module, and establishes a second equation related to the positive insulation resistance and the negative insulation resistance according to the second detection voltage, the preset second resistance parameter set, a preset third resistance parameter set corresponding to the second voltage detection module and a preset first discharge resistance parameter corresponding to the first discharge module;
and the control processing module solves according to the first equation and the second equation to obtain an anode insulation resistance value and a cathode insulation resistance value.
The invention provides a circuit, equipment and a method for rapidly measuring the insulation resistance of a battery, which have the following beneficial effects: the control processing module is used for controlling the state of the switching module, in the first state, the second discharging module is conducted, the discharge energy storage of the positive electrode equivalent capacitance of the battery positive electrode to the ground is allowed to reach a steady state quickly, and the control processing module is used for constructing a first equation according to the first detection voltage of the battery negative electrode detected by the first voltage detection module and the first battery voltage detected by the battery voltage detection module; in the second state, the first discharging module is conducted, the negative electrode equivalent capacitance of the battery negative electrode to the ground is allowed to discharge energy storage to reach a steady state rapidly, the control processing module detects the second battery voltage of the battery according to the second detection voltage of the battery positive electrode by the second voltage detection module and the battery voltage detection module, a second equation is constructed, and the first equation and the second equation are combined to obtain the positive electrode insulation resistance value and the negative electrode insulation resistance value. Therefore, the time consumption of the equivalent capacitance to reach a steady state is shortened through the first discharging module and the second discharging module, the purpose of rapid measurement is achieved, meanwhile, the first battery voltage and the second battery voltage are correspondingly obtained when the first detection voltage and the second detection voltage are obtained respectively, namely, the influence of battery voltage fluctuation is considered, the positive insulation resistance value and the negative insulation resistance value are obtained by solving based on the construction equation, the measurement error caused by the battery voltage fluctuation can be avoided, and the accuracy of insulation resistance measurement is improved.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a circuit diagram of one embodiment of a battery insulation resistance rapid measurement circuit provided by the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. 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.
A battery insulation resistance rapid measurement circuit of the present invention is described below with reference to fig. 1, including:
the battery voltage detection module is used for being connected with the anode and the cathode of the battery;
the first voltage detection module is used for being connected with the negative electrode of the battery and the ground;
the second voltage detection module is used for being connected with the anode of the battery and the ground;
the first bleeder module is connected with the first voltage detection module in parallel;
the second bleeder module is connected with the second voltage detection module in parallel;
the switching module is connected with the first voltage detection module, the second voltage detection module, the first discharge module and the second discharge module;
the control processing module is respectively connected with the battery voltage detection module, the first voltage detection module, the second voltage detection module and the switching module;
the switching module comprises a first state and a second state, wherein the first state enables the first voltage detection module and the second bleeder module to be conducted and the second voltage detection module and the first bleeder module to be disconnected, and the second state enables the second voltage detection module and the first bleeder module to be conducted and the first voltage detection module and the second bleeder module to be disconnected.
The control processing module is used for controlling the state of the switching module, in the first state, the second discharging module is conducted, the discharge energy storage of the positive electrode equivalent capacitance of the battery positive electrode to the ground is allowed to reach a steady state quickly, and the control processing module is used for constructing a first equation according to the first detection voltage of the battery negative electrode detected by the first voltage detection module and the first battery voltage detected by the battery voltage detection module; in the second state, the first discharging module is conducted, the negative electrode equivalent capacitance of the battery negative electrode to the ground is allowed to discharge energy storage to reach a steady state rapidly, the control processing module detects the second battery voltage of the battery according to the second detection voltage of the battery positive electrode by the second voltage detection module and the battery voltage detection module, a second equation is constructed, and the first equation and the second equation are combined to obtain the positive electrode insulation resistance value and the negative electrode insulation resistance value. Therefore, the time consumption of the equivalent capacitance to reach a steady state is shortened through the first discharging module and the second discharging module, the purpose of rapid measurement is achieved, meanwhile, the first battery voltage and the second battery voltage are correspondingly obtained when the first detection voltage and the second detection voltage are obtained respectively, namely, the influence of battery voltage fluctuation is considered, the positive insulation resistance value and the negative insulation resistance value are obtained by solving based on the construction equation, the measurement error caused by the battery voltage fluctuation can be avoided, and the accuracy of insulation resistance measurement is improved.
Referring to fig. 1, the positive and negative electrodes of the battery respectively correspond to a positive insulation resistance R p And the anode equivalent capacitance C connected in parallel p Negative electrode insulation resistance R n And parallel negative equivalent capacitance C n Due to the positive insulation resistance R p Resistance value of (2) and negative electrode insulation resistance R n The resistance value of (C) is relatively large, and the positive electrode equivalent capacitance is C p Negative equivalent capacitance C n The speed of the discharged energy storage is slower, and the branch circuit for discharging the energy storage is provided through the second discharging module and the first discharging module, so that the speed of the discharged energy storage can be improved, and the time consumption of the equivalent capacitor reaching a steady state is shortened.
The insulation resistance measurement involves two unknown quantities of an anode insulation resistance value and a cathode insulation resistance value, two equations are needed to be solved, the first equation and the second equation are correspondingly built according to the first state and the second state of the switching module, and then the anode insulation resistance value and the cathode insulation resistance value are obtained through simultaneous solving. When the first state and the second state are switched, the fact that the voltage of the battery possibly fluctuates is considered, so that a first equation is built based on the first detection voltage and the first battery voltage which are acquired simultaneously, and a second equation is built based on the second detection voltage and the second battery voltage which are acquired simultaneously, the influence caused by voltage fluctuation can be avoided, and the finally acquired positive electrode insulation resistance value and negative electrode insulation resistance value are more accurate.
It is understood that the switching module may further include a measurement stopping state, that is, the first voltage detecting module, the second voltage detecting module, the first bleeder module, and the second bleeder module are all disconnected, in addition to the first state and the second state.
In some embodiments of the present invention, the control processing module may include implementation manners of devices such as a single chip microcomputer and an embedded chip.
Referring to fig. 1, in some embodiments of a battery insulation resistance rapid measurement circuit of the present invention, the switching module includes a first switching member 110, a second switching member 120, a third switching member 130, and a fourth switching member 140, the first switching member 110 is connected to the first voltage detection module, the second switching member 120 is connected to the second voltage detection module, the third switching member 130 is connected to the first bleeder module, the fourth switching member 140 is connected to the second bleeder module, the control processing module is connected to the controlled end of the first switching member 110, the controlled end of the second switching member 120, the controlled end of the third switching member 130, and the controlled end of the fourth switching member 140, and the control processing module controls the first switching member 110 and the fourth switching member 140 to be closed and the second switching member 120 and the third switching member 130 to be opened, or controls the second switching member 120 and the third switching member 120 and the fourth switching member 140 to be closed and the fourth switching member 140 to be opened and the fourth switching member 140 to be closed.
In the first state, the first and fourth switching members 110 and 140 are closed and the second and third switching members 120 and 130 are opened, so that the battery negative electrode is connected to the first voltage detection module and disconnected from the first bleed module, and the battery positive electrode is connected to the second bleed module and disconnected from the second detection module; in the second state, the second and third switching members 120 and 130 are closed and the first and fourth switching members 110 and 140 are opened, so that the battery anode is in communication with the second voltage detection module and is disconnected from the second bleed module, and the battery cathode is in communication with the first bleed module and is disconnected from the first voltage detection module. In this way, the first switch element 110 and the fourth switch element 140 are in state synchronization, the second switch element 120 and the third switch element 130 are in state synchronization, and the two groups of states are mutually exclusive, so as to realize the switching detection state,
the first switching element 110, the second switching element 120, the third switching element 130, and the fourth switching element 140 may be devices capable of performing switching functions, such as photocouplers, field effect transistors, and the like.
It is understood that, in addition to the first state and the second state, a measurement stop state may be included, in which the first switch element 110, the second switch element 120, the third switch element 130, and the fourth switch element 140 are all turned off.
Referring to fig. 1, in some embodiments of a battery insulation resistance rapid measurement circuit according to the present invention, the first voltage detection module includes a first voltage dividing resistor 210, a second voltage dividing resistor 220, and a first voltage detection member, one end of the first voltage dividing resistor 210 is connected to a negative electrode of a battery, the other end of the first voltage dividing resistor 210 is connected to one end of the second voltage dividing resistor 220 through the first switch member 110, the other end of the second voltage dividing resistor 220 is grounded, the first voltage detection member is connected to the first voltage dividing resistor 210 or the second voltage dividing resistor 220, and the control processing module is connected to the first voltage detection member.
In the first state, the first switch element 110 is closed, the negative electrode of the battery is grounded through the first voltage dividing resistor 210 and the second voltage dividing resistor 220 to form a discharge branch, the first voltage detecting element detects the voltage of the first voltage dividing resistor 210 or the second voltage dividing resistor 220 as a first detected voltage value, and the first resistance value of the first voltage dividing resistor 210 and the second resistance value of the second voltage dividing resistor 220 are combined to represent the state of the voltage and the current, so that the first equation can be conveniently established subsequently.
The first voltage detection part can be an implementation mode comprising a proportional voltage reduction circuit, and the proportional voltage reduction circuit reduces the voltage according to a set proportion and inputs the reduced voltage to a terminal pin of the control processing module so as to achieve the effect of voltage detection; embodiments including a buck resistor, a voltage transformer, and the like are also possible.
In some embodiments of the present invention, the first switching element 110 may be connected in series between the first voltage dividing resistor 210 and the negative electrode of the battery or between the second voltage dividing resistor 220 and the ground, in addition to being connected in series between the first voltage dividing resistor 210 and the second voltage dividing resistor 220.
The first resistance value of the first voltage dividing resistor 210 and the second resistance value of the second voltage dividing resistor 220 may be preset first resistance parameter sets, and stored in the control processing module, so that the control processing module can conveniently solve and calculate the insulation resistance values later.
Referring to fig. 1, in some embodiments of a battery insulation resistance rapid measurement circuit according to the present invention, the second voltage detection module includes a third voltage dividing resistor 310, a fourth voltage dividing resistor 320, and a second voltage detection member, one end of the third voltage dividing resistor 310 is used to be connected to a positive electrode of a battery, the other end of the third voltage dividing resistor 310 is connected to one end of the fourth voltage dividing resistor 320 through the second switch 120, the other end of the fourth voltage dividing resistor 320 is grounded, the second voltage detection member is connected to the third voltage dividing resistor 310 or the fourth voltage dividing resistor 320, and the control processing module is connected to the second voltage detection member.
In the second state, the second switch 120 is closed, the positive electrode of the battery is grounded through the third voltage dividing resistor 310 and the fourth voltage dividing resistor 320 to form a discharge branch, the second detecting element detects the voltage of the third voltage dividing resistor 310 or the fourth voltage dividing resistor 320 as a second detected voltage value, and the third resistance value of the third voltage dividing resistor 310 and the fourth resistance value of the fourth voltage dividing resistor 320 are combined to represent the state of the voltage and the current, so that the second equation can be conveniently established subsequently.
The second voltage detection part can be an implementation mode comprising a proportional voltage reduction circuit, and the proportional voltage reduction circuit reduces the voltage according to a set proportion and inputs the reduced voltage to a terminal pin of the control processing module so as to achieve the effect of voltage detection; embodiments including a buck resistor, a voltage transformer, and the like are also possible.
In some embodiments of the present invention, the second switching element 120 may be connected in series between the third voltage dividing resistor 310 and the positive electrode of the battery or between the fourth voltage dividing resistor 320 and the ground, in addition to being connected in series between the third voltage dividing resistor 310 and the fourth voltage dividing resistor 320.
The third resistance value of the third voltage dividing resistor 310 and the fourth resistance value of the fourth voltage dividing resistor 320 may be preset second resistance parameter sets, and stored in the control processing module, so that the control processing module can conveniently solve and calculate the insulation resistance values later.
In some embodiments of the present invention, the first voltage detection module and the second detection module may include, in addition to the implementation of the voltage dividing circuit, a circuit for detecting a resistance value, including other balanced bridges, unbalanced bridges, and the like.
Referring to fig. 1, in some embodiments of a battery insulation resistance rapid measurement circuit according to the present invention, the first bleed module includes a first bleed resistor 410, one end of the first bleed resistor 410 is connected to a negative electrode of a battery through the third switching element 130, and the other end of the first bleed resistor 410 is grounded.
In the second state, the third switch is turned on to enable the first bleeder resistor 410 to be conducted with the negative electrode of the battery, meanwhile, the negative electrode equivalent capacitance of the battery negative electrode to the ground is equivalent to being connected with the negative electrode insulation resistor and the first bleeder resistor 410 in parallel, compared with the situation that the first bleeder resistor 410 is connected with the negative electrode insulation resistor in parallel, the first bleeder resistor 410 can provide a bleeder branch with low resistance, the negative electrode equivalent capacitance can be enabled to rapidly bleed and store energy through the first bleeder resistor 410, and the time for the negative electrode equivalent capacitance to reach a steady state is shortened.
Referring to fig. 1, in some embodiments of a battery insulation resistance rapid measurement circuit according to the present invention, the second bleed module includes a second bleed resistor 420, one end of the second bleed resistor 420 is connected to the positive electrode of the battery through the fourth switch 140, and the other end of the second bleed resistor 420 is grounded.
In the first state, the fourth switch is turned on to enable the second bleeder resistor 420 to be conducted with the positive electrode of the battery, meanwhile, the positive electrode equivalent capacitance of the battery positive electrode to the ground is equivalent to being connected with the positive electrode insulation resistor and the second bleeder resistor 420 in parallel, and compared with the situation that the second bleeder resistor 420 is connected with the positive electrode insulation resistor in parallel, the second bleeder resistor 420 can provide a bleeder branch with low resistance, so that the positive electrode equivalent capacitance can quickly bleed and store energy through the second bleeder resistor 420, and the time for the positive electrode equivalent capacitance to reach a steady state is shortened.
From the analysis of the parallel equivalent resistance angle, the resistance values of the negative electrode insulation resistance and the positive electrode insulation resistance are larger, and after the parallel first bleeder resistor 410 and the parallel second bleeder resistor 420 are correspondingly connected, the parallel integral equivalent resistance value is smaller than the resistance values of the first bleeder resistor 410 and the second bleeder resistor 420, so that the bleeder equivalent resistance values corresponding to the negative electrode equivalent capacitance and the positive electrode equivalent capacitance are smaller, and the time consumption for the bleeder energy storage to reach a steady state is reduced. Meanwhile, the overall equivalent resistance value is smaller than the resistance values of the first bleeder resistor 410 and the second bleeder resistor 420, namely, the overall equivalent resistance value is determined to be within a certain range, so that the upper limit time for reaching the steady state can be grasped.
The first and second bleeder modules may also be embodiments including bleeder circuits formed by a plurality of resistors in parallel.
Referring to fig. 1, in some embodiments of a battery insulation resistance rapid measurement circuit according to the present invention, the battery voltage detection module includes a fifth voltage division resistor 510, a sixth voltage division resistor 520, and a third voltage detection member, one end of the fifth voltage division resistor 510 is connected to a negative electrode of the battery, the other end of the fifth voltage division resistor 510 is connected to one end of the sixth voltage division resistor 520, one end of the sixth voltage division resistor 520 is connected to a positive electrode of the battery, the third voltage detection member is connected to the fifth voltage division resistor 510 or the sixth voltage division resistor 520, and the control processing module is connected to the third voltage detection member.
The fifth voltage dividing resistor 510 and the sixth voltage dividing resistor 520 are connected in series and then connected in parallel with the battery, and the voltage of the battery can be calculated and obtained by detecting the voltage of the fifth voltage dividing resistor 510 or the sixth voltage dividing resistor 520 through the third voltage detecting element and combining the fifth resistance value of the fifth voltage dividing resistor 510 and the sixth resistance value of the sixth resistor.
In some embodiments of the present invention, the third voltage detecting element may be an implementation manner including a proportional step-down circuit, where the proportional step-down circuit reduces the voltage according to a set proportion and inputs the reduced voltage to a terminal pin of the control processing module, so as to achieve the effect of voltage detection; embodiments including a buck resistor, a voltage transformer, and the like are also possible.
Referring to fig. 1, in some embodiments of a battery insulation resistance rapid measurement circuit according to the present invention, the battery insulation resistance rapid measurement circuit further includes a grounding switch 600, wherein the first voltage detection module, the second voltage detection module, the first bleed module, and the second bleed module are all grounded through the grounding switch 600, and the control processing module is connected to a controlled end of the grounding switch 600.
By providing the grounding switch 600, the grounding state of the whole detection circuit can be controlled, so that the control is more convenient, and the reliability of measurement is improved.
In some embodiments of the present invention, the grounding switch 600 may be an electric switch, such as a relay; the grounding switch 600 may also be a mechanical switch, and the state is switched by manual opening and closing, and the control processing module may not be connected to the mechanical switch in the embodiment of the mechanical switch.
The circuit can be specifically a frame of an electric automobile, and the insulation resistance represents the insulation performance between the battery and the frame and can reflect the safety of the automobile.
Referring to fig. 1, in some embodiments of a battery insulation resistance rapid measurement circuit of the present invention, a first equation is:
the second equation is:
wherein R is n1 A first resistance value which is the first voltage dividing resistor 210; r is R n2 A second resistance value which is the second voltage dividing resistor 220; v (V) n A voltage of the second voltage dividing resistor 220; u (U) 1 Is the first battery voltage; r is R n Is a negative electrode insulation resistor; r is R p The positive electrode insulation resistance; r is R p3 A resistance value of the second bleed resistor 420; r is R p1 A third resistance value which is a third voltage dividing resistor 310; r is R p2 A fourth resistance value that is a fourth voltage dividing resistor 320; v (V) p A voltage of the fourth voltage dividing resistor 320; u (U) 2 A second battery voltage; r is R n3 A resistance value of the first bleed resistor 410; the "||" is a resistor parallel calculator, and the specific calculation mode is as follows:
U 1 、U 2 can be based on the resistance R of the fifth voltage dividing resistor 510 bat1 Resistance value R with sixth voltage dividing resistor 520 bat2 Voltage V detected by combining with third voltage detecting part bat The specific calculation formula is as follows:
wherein V is bat1 The voltage of the sixth voltage dividing resistor 520 in the first state; v (V) bat2 Is the voltage of the sixth voltage dividing resistor 520 in the second state.
The first equation and the second equation are combined to solve the insulation resistance R of the cathode n Insulation resistance R with positive electrode p The specific value of (2) achieves the effect of insulation resistance measurement.
The invention also provides measurement equipment, which comprises the battery insulation resistance rapid measurement circuit.
The measuring equipment can be arranged on the electric automobile, the switching module is controlled to switch the first state and the second state through the periodic control processing module, and then the positive insulation resistance value and the negative insulation resistance value are obtained through periodic solving, so that the effect of monitoring whether the insulation resistance is abnormal can be achieved, and when the insulation resistance value is smaller than the preset lower limit value, the control processing module controls the warning module to work for warning, so that even if a fault condition is found, the safety is improved.
The measuring equipment can also be independent of equipment outside the electric automobile, is used for measuring the insulation resistance of a battery in the electric automobile when the electric automobile is maintained and detected, and controls the processing module to control the warning module to work to warn when the insulation resistance is smaller than a preset lower limit threshold value, so that even if a fault condition is found, the safety is improved.
The measuring device of the invention can be correspondingly referred to the battery insulation resistance rapid measuring circuit, and is not repeated.
The invention also provides a measuring method which is applied to the battery insulation resistance rapid measuring circuit or the measuring equipment and comprises the following steps:
the control processing module controls the switching module to switch to a first state, obtains a first detection voltage of the first voltage detection module and a first battery voltage of the battery voltage detection module, and establishes a first equation related to an anode insulation resistance and a cathode insulation resistance according to the first detection voltage, a preset first resistance parameter set corresponding to the first voltage detection module, the first battery voltage, a preset second resistance parameter set corresponding to the battery voltage detection module and a preset second discharge resistance parameter corresponding to the second discharge module;
the control processing module controls the switching module to switch to a second state, acquires a second detection voltage of the second voltage detection module and a second battery voltage of the battery voltage detection module, and establishes a second equation related to the positive insulation resistance and the negative insulation resistance according to the second detection voltage, the preset second resistance parameter set, a preset third resistance parameter set corresponding to the second voltage detection module and a preset first discharge resistance parameter corresponding to the first discharge module;
and the control processing module solves according to the first equation and the second equation to obtain an anode insulation resistance value and a cathode insulation resistance value.
Referring to fig. 1, the control processing module controls the switching module to switch to the first state, specifically, controls the first switch element 110 (Sn 1) and the fourth switch element 140 (Sp 2) to be closed and controls the second switch element 120 (Sp 1) and the third switch element 130 (Sn 2) to be opened, and waits for a preset first time. After a preset first time, the second voltage-dividing resistor 220 (R n2 ) Voltage V of (2) n As the first detection voltage, a sixth voltage dividing resistor 520 (R bat2 ) Voltage V of (2) bat1 Calculating a first battery voltage U 1 Then combine with the preset first resistance parameter set (includingFirst resistance value R of first voltage dividing resistor 210 n1 Second resistance value R of second voltage-dividing resistor 220 n2 ) Presetting a second resistance parameter group (including a fifth resistance value R of a fifth voltage dividing resistor 510) bat1 A sixth resistance value R with the sixth voltage dividing resistor 520 bat2 ) And presetting a second bleeder resistor 420 parameter (including a resistance value R of the second bleeder resistor 420 p3 ) A first equation is constructed.
The control processing module controls the switching module to switch to the second state, specifically, controls the second switch 120 (Sp 1) and the third switch 130 (Sn 2) to be closed, and controls the first switch 110 (Sn 1) and the fourth switch 140 (Sp 2) to be opened, waiting for a preset second time. After a preset second time, a fourth voltage dividing resistor 320 (R p2 ) Voltage V of (2) p As the second detection voltage, a sixth voltage dividing resistor 520 (R bat2 ) Voltage V of (2) bat2 Calculating a second battery voltage U 2 Then combining with a preset third resistance parameter set (including the third resistance value R of the third voltage dividing resistor 310) p1 A fourth resistance value R with the fourth voltage dividing resistor 320 p2 ) Presetting a second resistance parameter group (including a fifth resistance value R of a fifth voltage dividing resistor 510) bat1 A sixth resistance value R with the sixth voltage dividing resistor 520 bat2 ) And presetting a first bleed resistor 410 parameter (including a resistance value R of the first bleed resistor 410 n3 ) A second equation is constructed.
Solving the first equation and the second equation simultaneously to obtain an insulation resistance value R of the positive electrode p Insulation resistance value R with negative electrode n . The insulation resistance measurement is realized, and in the measurement process, the negative electrode equivalent capacitance of the battery negative electrode to the ground and the positive electrode equivalent capacitance of the battery positive electrode to the ground can reach a steady state rapidly through the first discharging module and the second discharging module, so that the measurement time is shortened. Simultaneously, in the first state and the second state, the detection voltage and the battery voltage are synchronously acquired, namely the first battery voltage U is acquired respectively 1 And a second battery voltage U 2 Measurement errors caused by voltage fluctuation of the battery can be avoided, and accuracy of insulation resistance measurement is improved.
In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A battery insulation resistance rapid measurement circuit, comprising:
the battery voltage detection module is used for being connected with the anode and the cathode of the battery;
the first voltage detection module is used for being connected with the negative electrode of the battery and the ground;
the second voltage detection module is used for being connected with the anode of the battery and the ground;
the first bleeder module is connected with the first voltage detection module in parallel;
the second bleeder module is connected with the second voltage detection module in parallel;
the switching module is connected with the first voltage detection module, the second voltage detection module, the first discharge module and the second discharge module;
the control processing module is respectively connected with the battery voltage detection module, the first voltage detection module, the second voltage detection module and the switching module;
the switching module comprises a first state and a second state, wherein the first state enables the first voltage detection module and the second bleeder module to be conducted and the second voltage detection module and the first bleeder module to be disconnected, and the second state enables the second voltage detection module and the first bleeder module to be conducted and the first voltage detection module and the second bleeder module to be disconnected.
2. The battery insulation resistance rapid measurement circuit according to claim 1, wherein: the switching module comprises a first switching piece (110), a second switching piece (120), a third switching piece (130) and a fourth switching piece (140), wherein the first switching piece (110) is connected with the first voltage detection module, the second switching piece (120) is connected with the second voltage detection module, the third switching piece (130) is connected with the first discharging module, the fourth switching piece (140) is connected with the second discharging module, the control processing module is connected with the controlled end of the first switching piece (110), the controlled end of the second switching piece (120), the controlled end of the third switching piece (130) and the controlled end of the fourth switching piece (140), and the control processing module controls the first switching piece (110) and the fourth switching piece (140) to be closed and the second switching piece (120) and the third switching piece (130) to be opened or controls the second switching piece (120) and the third switching piece (140) to be opened and the fourth switching piece (120) to be opened.
3. The battery insulation resistance rapid measurement circuit according to claim 2, wherein: the first voltage detection module comprises a first voltage dividing resistor (210), a second voltage dividing resistor (220) and a first voltage detection piece, one end of the first voltage dividing resistor (210) is used for being connected with the negative electrode of a battery, the other end of the first voltage dividing resistor (210) is connected with one end of the second voltage dividing resistor (220) through the first switch piece (110), the other end of the second voltage dividing resistor (220) is grounded, the first voltage detection piece is connected with the first voltage dividing resistor (210) or the second voltage dividing resistor (220), and the control processing module is connected with the first voltage detection piece.
4. The battery insulation resistance rapid measurement circuit according to claim 2, wherein: the second voltage detection module comprises a third voltage dividing resistor (310), a fourth voltage dividing resistor (320) and a second voltage detection part, one end of the third voltage dividing resistor (310) is used for being connected with the positive electrode of the battery, the other end of the third voltage dividing resistor (310) is connected with one end of the fourth voltage dividing resistor (320) through the second switch part (120), the other end of the fourth voltage dividing resistor (320) is grounded, the second voltage detection part is connected with the third voltage dividing resistor (310) or the fourth voltage dividing resistor (320), and the control processing module is connected with the second voltage detection part.
5. The battery insulation resistance rapid measurement circuit according to claim 2, wherein: the first bleeder module comprises a first bleeder resistor (410), one end of the first bleeder resistor (410) is connected with the negative electrode of the battery through the third switch piece (130), and the other end of the first bleeder resistor (410) is grounded.
6. The battery insulation resistance rapid measurement circuit according to claim 2, wherein: the second bleeder module comprises a second bleeder resistor (420), one end of the second bleeder resistor (420) is connected with the positive electrode of the battery through the fourth switch piece (140), and the other end of the second bleeder resistor (420) is grounded.
7. The battery insulation resistance rapid measurement circuit according to claim 1, wherein: the battery voltage detection module comprises a fifth voltage dividing resistor (510), a sixth voltage dividing resistor (520) and a third voltage detection part, one end of the fifth voltage dividing resistor (510) is connected with the negative electrode of the battery, the other end of the fifth voltage dividing resistor (510) is connected with one end of the sixth voltage dividing resistor (520), one end of the sixth voltage dividing resistor (520) is connected with the positive electrode of the battery, the third voltage detection part is connected with the fifth voltage dividing resistor (510) or the sixth voltage dividing resistor (520), and the control processing module is connected with the third voltage detection part.
8. A battery insulation resistance rapid measurement circuit according to any one of claims 1 to 7, characterized in that: the device further comprises a grounding switch (600), wherein the first voltage detection module, the second voltage detection module, the first discharging module and the second discharging module are grounded through the grounding switch (600), and the control processing module is connected with a controlled end of the grounding switch (600).
9. Measuring device, characterized by comprising a battery insulation resistance rapid measuring circuit according to any of claims 1 to 8, further comprising an alarm module, the control processing module being connected to the alarm module.
10. A measurement method, characterized by being applied to a battery insulation resistance rapid measurement circuit according to any one of claims 1 to 8 or a measurement apparatus according to claim 9, comprising:
the control processing module controls the switching module to switch to a first state, obtains a first detection voltage of the first voltage detection module and a first battery voltage of the battery voltage detection module, and establishes a first equation related to an anode insulation resistance and a cathode insulation resistance according to the first detection voltage, a preset first resistance parameter set corresponding to the first voltage detection module, the first battery voltage, a preset second resistance parameter set corresponding to the battery voltage detection module and a preset second discharge resistance parameter corresponding to the second discharge module;
the control processing module controls the switching module to switch to a second state, acquires a second detection voltage of the second voltage detection module and a second battery voltage of the battery voltage detection module, and establishes a second equation related to the positive insulation resistance and the negative insulation resistance according to the second detection voltage, the preset second resistance parameter set, a preset third resistance parameter set corresponding to the second voltage detection module and a preset first discharge resistance parameter corresponding to the first discharge module;
and the control processing module solves according to the first equation and the second equation to obtain an anode insulation resistance value and a cathode insulation resistance value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311791874.9A CN117783676A (en) | 2023-12-22 | 2023-12-22 | Circuit, equipment and method for rapidly measuring insulation resistance of battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311791874.9A CN117783676A (en) | 2023-12-22 | 2023-12-22 | Circuit, equipment and method for rapidly measuring insulation resistance of battery |
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| CN117783676A true CN117783676A (en) | 2024-03-29 |
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| CN202311791874.9A Pending CN117783676A (en) | 2023-12-22 | 2023-12-22 | Circuit, equipment and method for rapidly measuring insulation resistance of battery |
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| Country | Link |
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| CN (1) | CN117783676A (en) |
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- 2023-12-22 CN CN202311791874.9A patent/CN117783676A/en active Pending
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