CN109884534B - Power battery pack parameter detection method and detection device - Google Patents
Power battery pack parameter detection method and detection device Download PDFInfo
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Abstract
The invention relates to the technical field of vehicle power battery detection, and provides a power battery pack parameter detection method and a detection device, wherein the power battery pack parameter detection method comprises the following steps: collecting related parameters, and detecting the voltage value U at two ends of the resistor according to the detected lower bridge armb1And calculating the voltage value U of the battery pack by using the voltage values Ua21 and Ub21 of the two ends of the upper bridge arm detection resistor and the two ends of the lower bridge arm detection resistor at a certain momente(ii) a Judging the short circuit condition of the battery cell and the shell of the battery pack according to the magnitude relation between the voltage values at the two ends of the upper bridge arm detection resistor at different moments; and detecting the voltage stable value U at two ends of the resistor according to the fact that the voltage division of the voltage division resistor of the upper bridge arm voltage division unit is different when the voltage division in the circuit is differenta2And Ua3、UeAnd the lower bridge arm detects the sampled power supply voltage of the resistor, and calculates the insulation resistance of the battery pack. The method has the advantages of simple detection circuit, unified control of a plurality of parameters, optimization of the detection circuit, cost reduction, simplification of the detection process and reduction of the MCU control load.
Description
Technical Field
The invention relates to the technical field of vehicle power battery detection, in particular to a power battery pack parameter detection method and a detection device.
Background
The new energy automobile is the main direction of automobile development in the future, and the electric automobile represented by a pure electric automobile is one of the main ways for solving the problem of sustainable development of the automobile industry. In the running process of the new energy automobile, parameters such as Pack voltage of a power battery, short circuit conditions of a battery core and a shell, insulation resistance and the like need to be monitored in real time, accurate information is provided for the calculation processes of driving range and the like, short circuit or insulation faults are found in time, and personal safety is guaranteed.
In the prior art, the detection circuits for the above detection items are independent and separated, and the control of each detection item is also independent, for example, the detection and control are only performed on the voltage of the power battery Pack, and other parameters are not considered. Therefore, the circuit design and the complexity of the detection process are increased by using the scattered unit detection circuit, the MCU control load is increased, and the cost of the detection circuit is not facilitated.
Disclosure of Invention
In view of this, the present invention is directed to a method for detecting parameters of a power battery pack, so as to solve the problem of complicated circuit design and detection process caused by independent control of multiple parameters in the prior art, thereby reducing the MCU control load and reducing the cost of the detection circuit.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for detecting parameters of a power battery pack, wherein the parameters comprise voltage of the power battery pack, short circuit condition of a battery core and a shell of the power battery pack and insulation resistance, and the parameters are detected based on a power battery pack detection circuit, and the power battery pack detection circuit comprises: the power battery pack, the insulation resistance unit, the capacitance unit, the upper bridge arm voltage division unit, the lower bridge arm voltage division unit and the sampling resistance unit are connected in parallel, two ends of the sampling resistance unit are respectively connected with an automobile chassis and an external power supply, the sampling resistance unit is connected with a lower bridge arm detection resistor in the lower bridge arm voltage division unit in series and then connected with the automobile chassis, and the upper bridge arm voltage division unit comprises a first upper bridge arm voltage division unit and a second upper bridge arm voltage division unit.
And the method comprises: the following data were collected: under the condition that the upper bridge arm voltage division unit and the lower bridge arm voltage division unit are disconnected, the voltage value U at two ends of the lower bridge arm detection resistorb1(ii) a And closing the lower bridge arm voltage division unit and the first upper bridge arm voltage division unit, so that under the condition that the upper bridge arm voltage division unit and the lower bridge arm voltage division unit are connected with the power battery pack, at different moments, the voltage values Ua21, Ua22 and Ua23 at two ends of an upper bridge arm detection resistor in the upper bridge arm voltage division unit and the voltage value Ub21 at two ends of a lower bridge arm detection resistor are detected. According to the detected Ub1And Ua21 and Ub21, the known resistance values of the first upper bridge arm voltage division unit, the known lower bridge arm voltage division unit and the known sampling resistance unit are calculated to obtain a voltage value U of the power battery packe(ii) a Judging the situation between the battery core and the shell of the power battery pack according to the detected size relation among the Ua21, the Ua22 and the Ua 23; and when the voltage division of the voltage division resistor of the upper bridge arm voltage division unit in the circuit is different, calculating a voltage stabilization value U at two ends of the upper bridge arm detection resistora2And Ua3And according to the resistance values of the upper bridge arm divider resistor, the lower bridge arm divider resistor, the upper bridge arm detection resistor, the lower bridge arm detection resistor and the sampling resistor unit, the Ua2、Ua3、UeAnd the sampling power supply voltage V of the lower bridge arm detection resistoraAnd calculating the equivalent insulation resistance Rp of the high-voltage bus anode of the power battery pack to the vehicle chassis and the equivalent insulation resistance Rn of the high-voltage bus cathode of the power battery pack to the vehicle chassis.
Further, the determining a short circuit condition between the battery cell and the casing of the power battery pack includes: under the condition that every two of Ua21, Ua22 and Ua23 are equal, the situation that a short circuit exists between the battery core and the shell of the power battery pack is judged, and the position Nshort of the battery core which is in short circuit with the shell in the power battery pack to be detected is calculated according to the number N of the battery cores which are connected in series with the power battery pack to be detected and the detected Ua21 and Ub 21; and under the condition that the two Ua21, the two Ua22 and the two Ua23 are not equal, judging that no short circuit condition exists between the battery core and the shell of the power battery pack.
Further, the voltage stabilization value U at two ends of the upper bridge arm detection resistor is calculateda2The method comprises the following steps: under the condition that short circuit does not exist between the battery core and the shell of the power battery pack, calculating a voltage stabilization value U at two ends of an upper bridge arm detection resistor in the upper bridge arm voltage division unit according to the Ua21, the Ua22 and the Ua23a2。
Further, the voltage stabilization value U at two ends of the upper bridge arm detection resistor is calculateda3The method comprises the following steps: keeping the state that the lower bridge arm voltage division unit is connected with the power battery pack, and enabling the connection state of the upper bridge arm voltage division unit and the power battery pack to be one of the following states: disconnecting the first upper bridge arm voltage division unit and closing the second upper bridge arm voltage division unit to enable the second upper bridge arm voltage division unit to be connected with the power battery pack; and closing the first upper bridge arm voltage division unit and the second upper bridge arm voltage division unit simultaneously so as to acquire the following data under the condition that the upper bridge arm voltage division unit and the lower bridge arm voltage division unit are connected with the power battery pack: at different moments, voltage values Ua31, Ua32 and Ua33 at two ends of an upper bridge arm detection resistor in the upper bridge arm voltage division unit; and calculating a voltage stabilization value U at two ends of an upper bridge arm detection resistor in the upper bridge arm voltage division unit under the current condition according to the detected Ua31, Ua32 and Ua33a3。
Further, the power battery pack parameter detection method further includes: detecting the voltage value U of the power battery packeFirstly, detecting the sampling power supply voltage V of the lower bridge arm detection resistor by the following formulaa：Va＝2*Ub1。
Compared with the prior art, the power battery pack parameter detection method has the following advantages:
(1) the power battery pack parameter detection method uses a simple power battery pack detection circuit to uniformly control a plurality of parameters of the power battery pack, is favorable for optimizing the detection circuit and reduces the cost of the detection circuit;
(2) the power battery pack parameter detection method simplifies the detection process, reduces the MCU control load and realizes the rapid detection of the parameters of the power battery pack.
Another objective of the present invention is to provide a power battery pack parameter detection apparatus, so as to solve the problem that the control of multiple parameters of a power battery pack by using scattered unit detection circuits in the prior art is not favorable for simplifying the circuit design, and reduce the cost of the detection circuit.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a power battery pack parameter detection apparatus, the parameter comprising: the voltage of power battery package, electric core and casing short circuit condition and insulation resistance its characterized in that, power battery package parameter detection device includes: power battery package detection circuitry includes: the power battery pack, the insulation resistance unit, the capacitance unit, the upper bridge arm voltage division unit, the lower bridge arm voltage division unit and the sampling resistance unit are connected in parallel, two ends of the sampling resistance unit are respectively connected with an automobile chassis and an external power supply, the sampling resistance unit is connected with a lower bridge arm detection resistor in the lower bridge arm voltage division unit in series and then connected with the automobile chassis, and the upper bridge arm voltage division unit comprises a first upper bridge arm voltage division unit and a second upper bridge arm voltage division unit. The first I/O interface and the second I/O interface of the control unit are respectively connected to two ends of the upper bridge arm detection resistor and the lower bridge arm detection resistor in the upper bridge arm voltage division unit which are connected in series, and the control unit is used for acquiring the following data: under the condition that the upper bridge arm voltage division unit and the lower bridge arm voltage division unit are disconnected, the voltage value U at two ends of the lower bridge arm detection resistorb1(ii) a And closing the lower bridge arm voltage division unit and the first upper bridge arm voltage division unit, so that under the condition that the upper bridge arm voltage division unit and the lower bridge arm voltage division unit are connected with the power battery pack, at different moments, the voltage values Ua21, Ua22 and Ua23 at two ends of an upper bridge arm detection resistor in the upper bridge arm voltage division unit and the voltage value Ub21 at two ends of a lower bridge arm detection resistor are detected. And in dependence on said detectionUb1Ua21 and Ub21, and known resistance values of the first upper bridge arm voltage division unit, the first lower bridge arm voltage division unit and the known sampling resistance unit are calculated to obtain a voltage value U of the power battery packe(ii) a Judging the short circuit condition between the battery core and the shell of the power battery pack according to the detected size relationship among the Ua21, the Ua22 and the Ua 23; and when the voltage division of the voltage division resistor of the upper bridge arm voltage division unit in the circuit is different, calculating a voltage stabilization value U at two ends of the upper bridge arm detection resistora3And Ua3And according to the resistance values of the upper bridge arm divider resistor, the lower bridge arm divider resistor, the upper bridge arm detection resistor, the lower bridge arm detection resistor and the sampling resistor unit, the Ua2、Ua3、UeAnd the sampling power supply voltage V of the lower bridge arm detection resistoraAnd calculating the equivalent insulation resistance Rp of the high-voltage bus anode of the power battery pack to the vehicle chassis and the equivalent insulation resistance Rn of the high-voltage bus cathode of the power battery pack to the vehicle chassis.
Further, the control unit is configured to determine a short circuit condition between the battery cell and the casing of the power battery pack, and the short circuit condition includes: under the condition that every two of Ua21, Ua22 and Ua23 are equal, the situation that a short circuit exists between the battery core and the shell of the power battery pack is judged, and the position Nshort of the battery core which is in short circuit with the shell in the power battery pack to be detected is calculated according to the number N of the battery cores which are connected in series with the power battery pack to be detected and the detected Ua21 and Ub 21; and under the condition that the two Ua21, the two Ua22 and the two Ua23 are not equal, judging that no short circuit condition exists between the battery core and the shell of the power battery pack.
Further, the control unit is configured to calculate a voltage stabilization value U at two ends of the upper bridge arm detection resistora2The method comprises the following steps: under the condition that no short circuit exists between the battery core and the shell of the power battery pack, calculating a voltage stabilization value U at two ends of an upper bridge arm detection resistor in the upper bridge arm voltage division unit according to the Ua21, the Ua22 and the Ua23a2。
Further, the control unit is configured to calculate a voltage stabilization value U at two ends of the upper bridge arm detection resistora3The method comprises the following steps: health-care productKeeping the state that the lower bridge arm voltage division unit is connected with the power battery pack, and enabling the connection state of the upper bridge arm voltage division unit and the power battery pack to be one of the following states: disconnecting the first upper bridge arm voltage division unit and closing the second upper bridge arm voltage division unit to enable the second upper bridge arm voltage division unit to be connected with the power battery pack; and closing the first upper bridge arm voltage division unit and the second upper bridge arm voltage division unit simultaneously so as to acquire the following data under the condition that the upper bridge arm voltage division unit and the lower bridge arm voltage division unit are connected with the power battery pack: at different moments, voltage values Ua31, Ua32 and Ua33 at two ends of an upper bridge arm detection resistor in the upper bridge arm voltage division unit; and calculating a voltage stabilization value U at two ends of an upper bridge arm detection resistor in the upper bridge arm voltage division unit under the current condition according to the detected Ua31, Ua32 and Ua33a3。
Further, the control unit is further configured to: detecting the voltage value U of the power battery packeFirstly, detecting the sampling power supply voltage V of the lower bridge arm detection resistor by the following formulaa：Va＝2*Ub1。
Compared with the prior art, the parameter detection device of the power battery pack and the parameter detection method of the power battery pack have the same advantages, and are not repeated herein.
Another objective of the present invention is to provide a machine-readable storage medium to solve the problem of complicated circuit design and detection process caused by independent control of multiple parameters in the prior art, thereby reducing the MCU control load and reducing the cost of the detection circuit.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a machine-readable storage medium having instructions stored thereon for causing a machine to perform the power battery pack parameter detection method described above.
The machine-readable storage medium has the same advantages as the parameter detection method of the power battery pack compared with the prior art, and is not described herein again.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic connection diagram of a power battery pack detection circuit according to an embodiment of the invention;
fig. 2 is a schematic flow chart of a method for detecting parameters of a power battery pack according to an embodiment of the present invention;
fig. 3 is a schematic flow chart illustrating an application example of the method for detecting parameters of a power battery pack according to the embodiment of the present invention.
Description of reference numerals:
voltage values of MCU, control unit Ue and power battery pack
Up, voltage of high-voltage bus positive pole of power battery pack to vehicle chassis
Un, high-voltage bus negative pole of power battery pack to vehicle chassis voltage
Rp, first insulation resistor Rn and second insulation resistor
Cp, a first capacitor Cn and a second capacitor
R1, first upper bridge arm divider resistor R2 and second upper bridge arm divider resistor
R3, lower bridge arm divider resistance K1 and first switch
K2, a second switch K3, a third switch
I/O1, control unit first I/O interface I/O2, control unit second I/O interface
Ua, voltage Ub at two ends of upper bridge arm detection resistor and voltage at two ends of lower bridge arm detection resistor
Va, sampling power supply voltage a and negative electrode of certain battery cell
b. A battery pack housing connected to the vehicle chassis, i.e. the reference ground
Detailed Description
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The power battery pack detection circuit is based on national standard T18384.1-2001, and is improved on the basis of a typical full-bridge passive insulation detection circuit (as shown in figure 1). Fig. 1 is a schematic connection diagram of a power battery pack detection circuit according to an embodiment of the present invention, where the power battery pack detection circuit includes: the power battery pack, the insulation resistance unit, the capacitance unit, the upper bridge arm voltage division unit, the lower bridge arm voltage division unit and the sampling resistance unit are connected in parallel, two ends of the sampling resistance unit are respectively connected with the automobile chassis and an external power supply, the sampling resistance unit is connected with the lower bridge arm detection resistance in the lower bridge arm voltage division unit in series and then connected with the automobile chassis, and the upper bridge arm voltage division unit comprises a first upper bridge arm voltage division unit and a second upper bridge arm voltage division unit.
As shown in fig. 1, Ue represents the voltage of a Pack (power battery Pack) of a power battery to be detected (hereinafter, referred to as power battery Pack voltage), Up represents the voltage of a positive pole of a high-voltage bus to a chassis of the vehicle, and Un represents the voltage of a negative pole of the high-voltage bus to the chassis of the vehicle. Rp represents the equivalent insulation resistance (first insulation resistance) of the anode of the high-voltage bus to be detected to the vehicle chassis, and Rn represents the equivalent insulation resistance (second insulation resistance) of the cathode of the high-voltage bus to be detected to the vehicle chassis. Cp represents the high-voltage bus positive-to-vehicle chassis equivalent capacitance (first capacitance), and Cn represents the high-voltage bus negative-to-vehicle chassis equivalent capacitance (second capacitance). The R1, R2, R3 and R have known resistance values, and R1 and R2 satisfy the relation R1<R2, wherein R1Representing a first upper arm divider resistance, R2Representing a second upper arm divider resistance, R3And the resistance values of the lower bridge arm divider resistor, the upper bridge arm detection resistor, the lower bridge arm detection resistor and the sampling resistor unit can be set to be the same and are all represented by r. The capacitor unit comprises an upper bridge arm connected in seriesThe capacitor and the lower bridge arm capacitor, a connection point between the upper bridge arm insulation resistor and the lower bridge arm insulation resistor, a connection point between the upper bridge arm capacitor and the lower bridge arm capacitor, and a connection point between the upper bridge arm divider resistor and the lower bridge arm divider resistor are connected in series and then connected with the vehicle chassis.
When the first switch K1 is closed and the second switch K2 is opened, the anode of the high-voltage bus of the upper bridge arm, the detection resistor R of the upper bridge arm, the first switch K1, the divider resistor R1 of the first upper bridge arm and the vehicle chassis are sequentially connected, and a first road bridge arm measuring voltage dividing circuit can be formed; the first switch K1 is switched off, and meanwhile, the second switch K2 is switched on, so that the anode of the high-voltage bus of the upper bridge arm, the detection resistor R of the upper bridge arm, the second switch K2, the divider resistor R2 of the second upper bridge arm and the vehicle chassis are sequentially connected, and a second upper bridge arm measuring voltage division circuit can be formed; if K1 and K2 are simultaneously closed, the anode of the upper bridge arm high-voltage bus, a first upper bridge arm divider resistor R1, a second upper bridge arm divider resistor R2, a first switch K1, a second switch K2, an upper bridge arm detection resistor R and the vehicle chassis are sequentially connected, and a third upper bridge arm measurement divider circuit can be formed; the lower-arm high-voltage bus negative electrode, the lower-arm detection resistor R, the third switch K3, the lower-arm divider resistor R3 and the vehicle chassis are sequentially connected to form a lower-arm measuring voltage divider circuit.
Ua is voltage of an upper bridge arm detection resistor r, and is detected through a first I/O interface I/O1 of a control Unit MCU (Microcontroller Unit); ub is the voltage of the lower bridge arm detection resistor r, and the values of Ua and Ub can be directly read from the MCU through detection of a second I/O interface I/O2 of the control unit. Va is the sampled supply voltage of the lower arm detection resistor r. In the parameter detection process of the power battery pack, switches K1, K2 and K3 are required to work cooperatively.
Fig. 2 is a schematic flow chart of a method for detecting parameters of a power battery pack according to an embodiment of the present invention, and as shown in fig. 2, the method may include the following steps:
and S110, collecting data.
Only relevant parameters in the power battery pack detection circuit are collected in a reasonable mode and known parameters are combined, and the voltage of the power battery pack, the short circuit condition of the battery core and the shell of the power battery pack and the insulation resistance can be accurately calculated.
Firstly, cutting off all K1, K2 and K3, reading the voltage Ub of a lower bridge arm detection resistor r through an MCU (microprogrammed control Unit), and recording the voltage as Ub1Detecting the sampled power supply voltage V of the lower bridge arm detection resistor by the following formulaa：Va＝2*Ub1。
Because the voltage value of the sampling power supply is easy to have a voltage drift phenomenon, the error range is usually between 0 and 5mV, and in order to achieve the purpose of accurate calculation, the voltage value of the sampling power supply is calculated according to the voltage of the lower bridge arm detection resistor, so that the following calculation error caused by the drift of the voltage value of the sampling power supply is avoided.
Next, the first switch K1 and the third switch K3 are closed, and the second switch K2 is opened, so that a path is formed between the positive electrode of the high-voltage bus and the negative electrode of the high-voltage bus. With the closing time of the switches K1 and K3 as time 0, at time t11 (normally, the time interval between time t11 and time 0 is short, and the detection circuits of the power battery pack do not enter a stable state at time t11 and at times t12 and t13 described below) after the closing of the first switch K1 and the third switch K3 and the opening of the second switch K2 are completed, the values of Ua and Ub are read and recorded as Ua21 and Ub 21.
After the same time interval elapses after the time t11, two times t12 and t13 are selected (usually, the time interval between t21 and t11 is equal to the time interval between t31 and t21, and is usually one sampling period of the MCU), and the value of Ua is read and recorded as Ua22 and Ua 23.
And S120, calculating the voltage Ue of the power battery pack, and judging the short circuit condition between the electric core of the power battery pack and the shell.
First, the power battery pack voltage Ue, that is, Ue ═ f is calculated from the sampled power supply voltage Va, the value Ua21 of Ua acquired at time t11, and the value Ub21 of Ub acquired at time t11 (Va, Ua21, Ub 21).
Secondly, judging the short circuit condition between the battery core and the shell of the power battery pack according to the magnitude relation among the Ua21, Ua22 and Ua23 of the Ua at the time points of t11, t12 and t 13.
Under the condition that the number of the electric cores of the power battery pack to be detected in series is equal to the number of the electric cores of the power battery pack to be detected in series, detected Ua21 and detected Ub21, calculating the position Nshort, Nshort f of the electric core short-circuited with the shell in the power battery pack to be detected (Ua21, Ub21 and N). The following formula may be employed:
and calculating the position of the electric core in the power battery pack, which is short-circuited with the shell.
Under the condition that the two Ua21, the two Ua22 and the two Ua23 are unequal, the situation that a short circuit does not exist between the battery core and the shell of the power battery pack is judged, and according to the Ua21, the Ua22 and the Ua23, the voltage stability value U at two ends of an upper bridge arm detection resistor in an upper bridge arm voltage division unit is calculateda2，Ua2＝f(Ua21，Ua22，Ua23)。
And S130, calculating the insulation resistance value.
The insulation resistance value comprises equivalent insulation resistance Rp of a high-voltage bus anode of the power battery pack to a vehicle chassis and equivalent insulation resistance Rn of a high-voltage bus cathode of the power battery pack to the vehicle chassis.
The switching pattern is first determined from Ua 2. In order to make the voltage acquisition result more accurate, if the calculated U in step S120a2If the voltage is less than a first set threshold value U1, keeping K3 and K1 closed, and closing K2 at the same time to increase the partial voltage of the upper bridge arm detection resistor r; if U is presenta2Above a second set threshold U2, K3 is kept closed, K1 is opened, and K2 is closed, known as R2>And R1, the voltage division of the upper bridge arm detection resistor R can be reduced. When U1<Ua2<U2, to reduce switch state switching, K1, K2, K3 may be selected to be closed simultaneously. Wherein 0<U1<U2<Rated voltage U of battery packForehead (forehead)The value of U1 is near zero and the value of U2 is near UForehead (forehead)。
Herein according to Ua2The switching mode of the switch is determined according to the voltage division of the detection resistor r of the upper bridge arm, namely the switching mode of the switch of the next step is determined according to the voltage division of the detection resistor r of the upper bridge arm, and the voltage division ratio of the detection resistor r can be adjusted to ensure that the voltage division value of the detection resistor r of the upper bridge arm is in a state that the MCU can control the voltage division valueSo as to realize accurate and wide-range detection of the insulation resistance within an accurate reading range.
The time when the switch state is switched is 0. Reading the Ua voltage values at the time points of t21, t22 and t23 (the time points of t21, t22 and t23 are selected in the step S110), respectively marking as Ua31, Ua32 and Ua33, calculating the Ua stable voltage value under the current state according to Ua31, Ua32 and Ua33, and marking as Ua3。Ua3＝f(Ua31，Ua32，Ua33)。
Calculating an insulation resistance value based on the calculation result, wherein Rp ═ f (Va, Ue, U)a2，Ua3)，Rn＝f(Va，Ue，Ua2，Ua3)。
Fig. 3 is a schematic flow chart illustrating an application example of the method for detecting parameters of a power battery pack according to the embodiment of the present invention. As shown in fig. 3, based on the power battery pack parameter detection circuit shown in fig. 1, in an application example of the present invention, for power battery pack voltage detection, short circuit condition detection between a battery core and a casing, and insulation resistance detection, specific steps are as follows:
and S210, calculating a sampling power supply voltage value Va.
All of K1, K2 and K3 are disconnected; reading a Ub voltage value from the MCU, and recording the Ub voltage value as Ub 1; va was calculated. Va ═ f (Ub 1).
In particular, Va＝2*Ub1。
And S220, calculating the voltage Ue of the power battery pack.
And simultaneously closing K3 and K1, and opening K2 to enable the positive electrode of the bus and the negative electrode of the bus to form a passage, and calculating the voltage Ue of the power battery pack to be f (Va, Ua21 and Ub 21).
The switch closing time is set as 0 time. At time t1, the Ua and Ub voltage values are read as Ua21 and Ub21, respectively, and at time t2 and t3, the Ua voltage values are read as Ua22 and Ua23, respectively.
And S230, judging the short circuit condition between the battery cell and the shell of the power battery pack.
And judging whether the Ua21 is equal to Ua22 is equal to Ua23, if so, judging that the short circuit condition exists between the battery cell of the power battery pack and the shell, and estimating the position Nshort of the battery cell with the shell. And if the number of the series-connected battery cores of the battery pack to be detected is N, then Nshort ═ f (Ua21, Ub21, N), and then entering a fault processing flow.
If the Ua21, the Ua22 and the Ua23 are not equal, the situation that the short circuit between the battery core and the shell of the power battery pack does not exist is judged, and the Ua stable voltage value U is calculateda2。Ua2＝f(Ua21,Ua22,Ua23)。
S240, calculating insulation resistance values Rp and Rn.
According to Ua2The switch switching mode is determined according to the size of the voltage, and the accurate voltage acquisition result is ensured because the R2 is known>R1, so if Ua2If the voltage is less than the threshold value U1, keeping K3 and K1 closed, and closing K2 to increase the partial voltage of the upper bridge arm detection resistor r; if U is presenta2And if the voltage is greater than the threshold value U2, keeping K3 closed, opening K1 and closing K2 simultaneously to reduce the partial voltage of the upper bridge arm detection resistor r. If U1<Ua2<U2, to reduce switch state switching, K1, K2, K3 may be selected to be closed simultaneously.
The time when the switch state is switched is 0. At times t1, t2, and t3, the Ua voltage values are read and are denoted Ua31, Ua32, and Ua33, respectively.
Calculating the Ua stable voltage value, and recording as Ua3。Ua3＝f(Ua31,Ua32,Ua33)。
The insulation resistance value is calculated based on the above calculation result. Rp ═ f (Va, Ue)，Ua2，Ua3)，Rn＝f(Va，Ue，Ua2，Ua3)。
If K3, K2 are closed and K1 is opened in step S240, the method is executed
If K3, K2, K1 are closed simultaneously at 3-a, then
And repeating the steps S220-S240, and periodically detecting the voltage value of the power battery pack, the short circuit condition of the battery core and the shell and the insulation resistance value.
In addition, the present invention provides a power battery pack parameter detection apparatus, wherein the power battery pack parameters include: the voltage of power battery package, electric core and casing short circuit condition and insulation resistance its characterized in that, power battery package parameter detection device includes: power battery package detection circuitry includes: the power battery pack, the insulation resistance unit, the capacitance unit, the upper bridge arm voltage division unit, the lower bridge arm voltage division unit and the sampling resistance unit are connected in parallel, two ends of the sampling resistance unit are respectively connected with the automobile chassis and an external power supply, the sampling resistance unit is connected with the automobile chassis after being connected with the lower bridge arm detection resistance in the lower bridge arm voltage division unit in series, and the upper bridge arm voltage division unit comprises a first upper bridge arm voltage division unit and a second upper bridge arm voltage division unit. Control unit, first I/O interface and second I/O interface of control unitThe control unit is used for acquiring the following data: under the condition that the upper bridge arm voltage division unit and the lower bridge arm voltage division unit are disconnected, the voltage value U of the two ends of the lower bridge arm detection resistorb1(ii) a And under the condition that the lower bridge arm voltage division unit and the first upper bridge arm voltage division unit are closed, and the upper bridge arm voltage division unit and the lower bridge arm voltage division unit are connected with the power battery pack, the voltage values Ua21, Ua22 and Ua23 at two ends of the upper bridge arm detection resistor and the voltage value Ub21 at two ends of the lower bridge arm detection resistor in the upper bridge arm voltage division unit are different in time. And according to the detected Ub1And the voltage value U of the power battery pack is obtained by calculating the resistance values of the Ua21 and the Ub21, the known first upper bridge arm voltage division unit, the known lower bridge arm voltage division unit and the known sampling resistance unite(ii) a Judging the short circuit condition between the battery core and the shell of the power battery pack according to the detected size relationship among the Ua21, the Ua22 and the Ua 23; and when the voltage division of the voltage division resistor of the upper bridge arm voltage division unit in the circuit is different, calculating a voltage stable value U at two ends of the upper bridge arm detection resistora2And Ua3And according to the resistance values of the upper bridge arm divider resistor, the lower bridge arm divider resistor, the upper bridge arm detection resistor, the lower bridge arm detection resistor and the sampling resistor unit, the U valuea2、Ua3、UeAnd the sampling power supply voltage V of the lower bridge arm detection resistoraAnd calculating the equivalent insulation resistance Rp of the positive pole of the high-voltage bus of the power battery pack to the vehicle chassis and the equivalent insulation resistance Rn of the negative pole of the high-voltage bus of the power battery pack to the vehicle chassis.
Other specific implementation details of the detection device of the power battery pack are the same as those of the detection method of the power battery pack, and are not described herein again.
Through the technical scheme, the power battery pack parameter detection circuit can realize periodic detection on a plurality of parameters of the power battery pack in one detection circuit, is favorable for optimizing the detection circuit, effectively reduces the cost of the detection circuit, simplifies the detection process, lightens the MCU control load, realizes wide-range accurate detection on the insulation resistance, and greatly improves the rapidity and the accuracy of the power battery pack parameter detection.
It should be noted that the active injection method insulation detection circuit and other full-bridge or half-bridge passive insulation detection circuits based on the national standard are also applicable to the power battery pack parameter detection method in the technical scheme. Further to step S3, U1<Ua2<In the case of U2, the switches K3 and K2 may be selectively closed, and the switch K1 may be opened to perform subsequent correlation acquisition and calculation.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not describe every possible combination.
Those skilled in the art will understand that all or part of the steps in the method according to the above embodiments may be implemented by a program, which is stored in a storage medium and includes several instructions to enable a single chip, a chip, or a processor (processor) to execute all or part of the steps in the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In addition, any combination of various different implementation manners of the embodiments of the present invention is also possible, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the combination does not depart from the spirit of the embodiments of the present invention.
Claims (6)
1. A power battery pack parameter detection method is characterized in that the parameters comprise the voltage of the power battery pack, the short circuit condition of a battery core and a shell of the power battery pack and insulation resistance, and the parameters are detected based on a power battery pack detection circuit,
the power battery pack detection circuit comprises: the power battery pack, the insulation resistance unit, the capacitance unit, the upper bridge arm voltage division unit, the lower bridge arm voltage division unit and the sampling resistance unit are connected in parallel, one end of the sampling resistance unit is connected with a sampling power supply, the other end of the sampling resistance unit is connected with a lower bridge arm detection resistor in the lower bridge arm voltage division unit in series and then connected with an automobile chassis, and the upper bridge arm voltage division unit comprises a first upper bridge arm voltage division unit and a second upper bridge arm voltage division unit;
and the method comprises:
the following data were collected:
under the condition that the upper bridge arm voltage division unit and the lower bridge arm voltage division unit are disconnected, the voltage value U at two ends of the lower bridge arm detection resistorb1(ii) a Closing the lower bridge arm voltage division unit and the first upper bridge arm voltage division unit, so that when the upper bridge arm voltage division unit and the lower bridge arm voltage division unit are connected with the power battery pack, at three moments with equal time intervals, the time intervals are one sampling period of a control unit, and the voltage values Ua21, Ua22 and Ua23 at two ends of an upper bridge arm detection resistor in the upper bridge arm voltage division unit and the voltage value Ub21 at two ends of the lower bridge arm detection resistor are detected; according to the detected Ub1And Ua21 and Ub21, the known resistance values of the first upper bridge arm voltage division unit, the known lower bridge arm voltage division unit and the known sampling resistance unit are calculated to obtain a voltage value U of the power battery packe；
Wherein,
r3-lower arm divider resistance;
r1-first upper leg voltage divider resistor;
r is upper bridge arm detection resistance;
judging the short circuit condition between the battery core and the shell of the power battery pack according to whether the detected Ua21, Ua22 and Ua23 are equal in pairs, and if the detected Ua21, Ua22 and Ua23 are equal in pairs, judging that the battery core and the shell of the power battery pack are short-circuited; if the Ua21, the Ua22 and the Ua23 are different from each other, judging that the electric core and the shell of the power battery pack are not short-circuited; and
under the condition that no short circuit exists between the battery core and the shell of the power battery pack, calculating a voltage stabilization value U at two ends of an upper bridge arm detection resistor in the upper bridge arm voltage division unit according to the Ua21, the Ua22 and the Ua23a2；
Keeping the state that the lower bridge arm voltage division unit is connected with the power battery pack, and enabling the connection state of the upper bridge arm voltage division unit and the power battery pack to be one of the following states:
disconnecting the first upper bridge arm voltage division unit and closing the second upper bridge arm voltage division unit to enable the second upper bridge arm voltage division unit to be connected with the power battery pack; and
simultaneously closing the first upper bridge arm voltage division unit and the second upper bridge arm voltage division unit,
under the condition that the upper bridge arm voltage division unit and the lower bridge arm voltage division unit are connected with the power battery pack, the following data are acquired: at the moment that three time intervals are equal, the time interval is one sampling period of a control unit, and voltage values Ua31, Ua32 and Ua33 at two ends of an upper bridge arm detection resistor in an upper bridge arm voltage division unit; and
according to the detected Ua31, Ua32 and Ua33, calculating a voltage stabilization value U at two ends of an upper bridge arm detection resistor in the upper bridge arm voltage division unit under the current conditiona3；
And according to the resistance values of the upper bridge arm divider resistor, the lower bridge arm divider resistor, the upper bridge arm detection resistor, the lower bridge arm detection resistor and the sampling resistor unit, the Ua2、Ua3、UeAnd the sampling power supply voltage V of the lower bridge arm detection resistoraAnd calculating the equivalent insulation electricity of the high-voltage bus anode of the power battery pack to the vehicle chassisResistance Rp and equivalent insulation resistance Rn of a negative electrode of a high-voltage bus of the power battery pack to a vehicle chassis;
wherein Va is 2Ub1R2 is a second upper arm divider resistor, and R3 is a lower arm divider resistor.
2. The method for detecting the parameters of the power battery pack according to claim 1, wherein the determining of the short circuit between the battery core and the casing of the power battery pack includes:
under the condition that every two of Ua21, Ua22 and Ua23 are equal, the situation that a short circuit exists between the battery core and the shell of the power battery pack is judged, and the position Nshort of the battery core which is in short circuit with the shell in the power battery pack to be detected is calculated according to the number N of the battery cores which are connected in series with the power battery pack to be detected and the detected Ua21 and Ub 21;
and under the condition that the two Ua21, the two Ua22 and the two Ua23 are not equal, judging that no short circuit condition exists between the battery core and the shell of the power battery pack.
3. The power battery pack parameter detection method according to claim 1, further comprising: detecting the voltage value U of the power battery packeFirstly, detecting the sampling power supply voltage V of the lower bridge arm detection resistor by the following formulaa：Va＝2*Ub1。
4. A power battery pack parameter detection apparatus, the parameter comprising: the voltage of power battery package, electric core and casing short circuit condition and insulation resistance its characterized in that, power battery package parameter detection device includes:
power battery package detection circuitry includes: the power battery pack, the insulation resistance unit, the capacitance unit, the upper bridge arm voltage division unit, the lower bridge arm voltage division unit and the sampling resistance unit are connected in parallel, one end of the sampling resistance unit is connected with a sampling power supply, the other end of the sampling resistance unit is connected with a lower bridge arm detection resistor in the lower bridge arm voltage division unit in series and then connected with an automobile chassis, and the upper bridge arm voltage division unit comprises a first upper bridge arm voltage division unit and a second upper bridge arm voltage division unit;
a first I/O interface and a second I/O interface of the control unit are respectively connected with two ends of an upper bridge arm detection resistor and a lower bridge arm detection resistor in the upper bridge arm voltage division unit which are connected in series,
the control unit is used for collecting the following data:
under the condition that the upper bridge arm voltage division unit and the lower bridge arm voltage division unit are disconnected, the voltage value U at two ends of the lower bridge arm detection resistorb1；
Closing the lower bridge arm voltage division unit and the first upper bridge arm voltage division unit, so that when the upper bridge arm voltage division unit and the lower bridge arm voltage division unit are connected with the power battery pack, at three moments with equal time intervals, the time intervals are one sampling period of a control unit, and the voltage values Ua21, Ua22 and Ua23 at two ends of an upper bridge arm detection resistor in the upper bridge arm voltage division unit and the voltage value Ub21 at two ends of the lower bridge arm detection resistor are detected; and
according to the detected Ub1Ua21 and Ub21, and known resistance values of the first upper bridge arm voltage division unit, the first lower bridge arm voltage division unit and the known sampling resistance unit are calculated to obtain a voltage value U of the power battery packe(ii) a Judging the short circuit condition between the battery core and the shell of the power battery pack according to whether the detected two units of Ua21, Ua22 and Ua23 are equal, and if the two units of Ua21, Ua22 and Ua23 are equal, judging that the battery core and the shell of the power battery pack are short-circuited; if the Ua21, the Ua22 and the Ua23 are different from each other, judging that the electric core and the shell of the power battery pack are not short-circuited; and under the condition that no short circuit exists between the battery core and the shell of the power battery pack, calculating a voltage stabilization value U at two ends of an upper bridge arm detection resistor in the upper bridge arm voltage division unit according to the Ua21, the Ua22 and the Ua23a2；
Keeping the state that the lower bridge arm voltage division unit is connected with the power battery pack, and enabling the connection state of the upper bridge arm voltage division unit and the power battery pack to be one of the following states:
disconnecting the first upper bridge arm voltage division unit and closing the second upper bridge arm voltage division unit to enable the second upper bridge arm voltage division unit to be connected with the power battery pack; and
simultaneously closing the first upper bridge arm voltage division unit and the second upper bridge arm voltage division unit,
under the condition that the upper bridge arm voltage division unit and the lower bridge arm voltage division unit are connected with the power battery pack, the following data are acquired: at different moments, voltage values Ua31, Ua32 and Ua33 at two ends of an upper bridge arm detection resistor in the upper bridge arm voltage division unit; and
according to the detected Ua31, Ua32 and Ua33, calculating a voltage stabilization value U at two ends of an upper bridge arm detection resistor in the upper bridge arm voltage division unit under the current conditiona3；
And according to the upper bridge armA piezoelectric resistor, a lower bridge arm divider resistor, an upper bridge arm detection resistor, a lower bridge arm detection resistor, a resistance value of a sampling resistor unit, and the Ua2、Ua3、UeAnd the sampling power supply voltage V of the lower bridge arm detection resistoraCalculating the equivalent insulation resistance Rp of the positive pole of the high-voltage bus of the power battery pack to the vehicle chassis and the equivalent insulation resistance Rn of the negative pole of the high-voltage bus of the power battery pack to the vehicle chassis;
wherein,
r3-lower arm divider resistance;
r1-first upper leg voltage divider resistor;
r is upper bridge arm detection resistance;
wherein Va is 2Ub1R2 is a second upper arm divider resistor, and R3 is a lower arm divider resistor.
5. The device for detecting the parameters of the power battery pack according to claim 4, wherein the control unit for determining the short circuit condition between the battery core and the casing of the power battery pack includes:
under the condition that every two of Ua21, Ua22 and Ua23 are equal, the situation that a short circuit exists between the battery core and the shell of the power battery pack is judged, and the position Nshort of the battery core which is in short circuit with the shell in the power battery pack to be detected is calculated according to the number N of the battery cores which are connected in series with the power battery pack to be detected and the detected Ua21 and Ub 21;
and under the condition that the two Ua21, the two Ua22 and the two Ua23 are not equal, judging that no short circuit condition exists between the battery core and the shell of the power battery pack.
6. A machine-readable storage medium having instructions stored thereon for causing a machine to perform the power battery pack parameter detection method of any of claims 1-3.
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