CN106814311A - Battery circuit breaker capable of detecting abnormal conduction of switch and detection method thereof - Google Patents

Abstract

A battery circuit breaker that can detect abnormal conduction of a switch and a detection method thereof. The battery circuit breaker has a first switch, a second switch and a processor. The first switch and the second switch are arranged between the power supply and the load. current path and a second current path. The first switch and the second switch are selectively turned on according to the enable signal. The processor is electrically connected to one of the first and second current paths. When the enable signal indicates that the first and second switches are turned off, the processor determines whether the first or second switch is abnormally conductive based on the voltage value of the first or second current path and the preset voltage value. When it is determined that the first or second switch is not conducting normally, the processor compares the voltage value of the first or second current path with the preset voltage value and determines that the first or second switch is not conducting normally.

Description

Battery circuit breaker capable of detecting abnormal conduction of switch and detection method thereof

technical field

The invention relates to a battery circuit breaker capable of detecting abnormal conduction of the switch and a detection method thereof, in particular to a battery circuit breaker suitable for electric vehicles to judge whether the battery circuit breaker switch of the electric vehicle is welded and not normally conducted and its detection method.

Background technique

Existing vehicles usually burn gasoline as a power source. With the promotion of environmental protection concepts, in order to reduce the damage caused by burning gasoline and collecting oil to the environment, there are currently many researches and resources invested in the development of electric vehicles. Although electric vehicles use electricity as a power source to reduce damage to the environment, the battery capacity, charging and discharging efficiency, and system stability of the power system are all related to the quality of electric vehicles.

In the electric vehicle power supply system, a battery circuit breaker is usually set on the current path from the power supply to the electric vehicle, and whether the battery circuit breaker is turned on or not determines whether the electric vehicle's key is on or closed. off). However, when the user has controlled the battery breaker to cut off, but the battery breaker is abnormally turned on due to switch welding or other reasons, the power supply will continue to supply power to the electric vehicle, thereby causing power consumption. The existing battery circuit breaker does not have a mechanism to detect whether the switch is abnormally turned on, and the method of detecting whether the switch is turned on is usually to install a voltmeter at both ends of the switch, and judge whether the switch is turned on by measuring the voltage at both ends of the switch. Pass. However, if the battery circuit breaker adopts this method, it will not only increase the number of detection times, but also need to install a voltmeter at both ends of each switch, thereby increasing the detection cost.

Contents of the invention

The present invention is to provide a battery circuit breaker capable of detecting abnormal conduction of the switch and its detection method, so as to solve the problem that the existing battery circuit breaker cannot detect whether the switch of the battery circuit breaker is abnormally conducted, thereby reducing the power supply of the electric vehicle Situations of abnormal consumption.

The battery circuit breaker capable of detecting abnormal conduction of switches disclosed by the present invention has a first switch, a second switch and a processor. The first switch is disposed on the first current path between the first end of the power supply and the load, and is selectively turned on according to the enabling signal. The second switch is disposed on the second current path between the second end of the power supply and the load, and is selectively turned on according to the enabling signal. The processor is electrically connected to one of the first current path and the second current path, and when the enable signal indicates that the first switch and the second switch are switched to off, the processor operates according to one of the first current path and the second current path. The voltage value and the preset voltage value determine whether one of the first switch and the second switch is abnormally conducted, and when it is judged that one of the first switch and the second switch is abnormally conducted, the processor compares the first The magnitude of the voltage value of one of the current path and the second current path and the preset voltage value determines whether the first switch is abnormally turned on or the second switch is abnormally turned on.

The method for detecting abnormal conduction of a switch of a battery circuit breaker disclosed by the invention is suitable for a battery circuit breaker. The battery circuit breaker has a first switch and a second switch, and the first switch is arranged on a first current path between the first end of the power supply and the load. The second switch is disposed on the second current path between the second end of the power supply and the load. The method for the battery circuit breaker to detect the abnormal conduction of the switch includes selectively conducting the first switch and the second switch according to the enable signal. When the enabling signal indicates that the first switch and the second switch are turned off, one of the first switch and the second switch is determined according to a voltage value and a preset voltage value of one of the first current path and the second current path Whether the conduction is abnormal. When it is judged that one of the first switch and the second switch is not normally turned on, comparing the voltage value of one of the first current path and the second current path with the preset voltage value, and judging that the first switch is not turned on normally Or the second switch is abnormally turned on.

According to the battery circuit breaker and its detection method disclosed in the present invention that can detect the abnormal conduction of the switch, the processor detects the voltage on the first current path and the second current path, and can judge whether the first switch or Whether one of the second switches is abnormally conducted can also determine whether the first switch is abnormally conducted or the second switch is abnormally conducted, so that the battery circuit breaker can detect whether the switch of the battery circuit breaker is abnormally conducted. , thereby reducing the abnormal consumption of the electric vehicle's power supply.

The above descriptions about the present disclosure and the following descriptions of the embodiments are used to demonstrate and explain the spirit and principle of the present invention, and provide further explanations of the patent application scope of the present invention.

Description of drawings

FIG. 1 is a schematic circuit diagram of a battery breaker according to an embodiment of the present invention.

FIG. 2 is a schematic circuit diagram of a battery breaker according to another embodiment of the present invention.

FIG. 3 is a schematic diagram of preset voltage waveforms and actual voltage waveforms according to yet another embodiment of the present invention.

FIG. 4 is a flowchart of steps of a method for measuring insulation resistance according to an embodiment of the present invention.

FIG. 5 is a flowchart of steps of a method for measuring insulation resistance according to another embodiment of the present invention.

Wherein reference sign is:

10, 40 Battery circuit breaker

11, 41 First switch

13, 43 Second switch

15, 45 processors

47 Third switch

49 Fourth switch

20, 50 Power

21, 51 first end

23, 53 second end

30, 60 load

Z1, Z3 first insulation resistance

Z2, Z4 second insulation resistance

Ra, Re the first internal impedance

Rb, Rf Second internal impedance

Rc, Rd resistance

P1, P3 first current path

P2, P4 Second current path

detailed description

The detailed features and advantages of the present invention are described in detail below in the implementation manner, and its content is enough to make any person familiar with the relevant art understand the technical content of the present invention and implement it accordingly, and according to the content disclosed in this specification, the patent scope of the application and the drawings , anyone skilled in the relevant art can easily understand the related objects and advantages of the present invention. The following examples are to further describe the present invention in detail, but not to limit the scope of the present invention in any way.

Please refer to FIG. 1 , which is a schematic circuit diagram of a battery circuit breaker according to an embodiment of the present invention. As shown in FIG. 1 , the battery breaker 10 has a first switch 11 , a second switch 13 and a processor 15 . The first switch 11 is disposed on the first current path P1 between the first end 21 of the power source 20 and the load 30 , and is selectively turned on according to the enabling signal. The second switch 13 is disposed on the second current path P2 between the second terminal 23 of the power source 20 and the load 30 , and is selectively turned on according to the enable signal. The processor 15 is electrically connected to one of the first current path P1 and the second current path P2. When the enable signal indicates that the first switch 11 and the second switch 13 are switched to cut off, the processor 15 according to the first current path P1 and the second current path P2 The voltage value and the preset voltage value of one of the second current paths P2 determine whether one of the first switch 11 and the second switch 13 is abnormally conducted, and when judging whether one of the first switch 11 and the second switch 13 is When the conduction is abnormal, the processor 15 compares the voltage value of one of the first current path P1 and the second current path P2 with the preset voltage value, and judges whether the first switch 11 is abnormally conducting or the second switch 13 Abnormal conduction.

The first terminal 21 and the second terminal 23 of the power source 20 are, for example, the positive terminal and the negative terminal of the battery. The first switch 11 is used for conducting the current path between the positive end of the power supply 20 and the load 30 , and the second switch 13 is used for conducting the current path between the negative end of the power supply 20 and the load 30 . When the first switch 11 and the second switch 13 are fused due to heat or other factors, it may cause the positive terminal or the negative terminal of the power supply 20 to continuously supply power to the load 30. Therefore, by detecting the first current path P1 and the second current The voltage value of one of the paths P2 can be used to determine whether the first switch 11 or the second switch 13 is abnormally turned on.

Furthermore, since the power system of the current electric vehicle is mostly connected to the vehicle body, it serves as a low voltage level of the power system. The insulation resistance between the power system and the car body is usually used as the basis for the leakage protection of the power system, that is, the insulation resistance of the electric vehicle needs to be controlled above a limit value to ensure the protection effect of the electric vehicle power system. However, during the running of the electric vehicle, such as driving through puddles, bumping or rubbing against the vehicle body due to uneven road surface, etc., the insulation resistance of the electric vehicle may change. Therefore, in another embodiment, the battery In addition to detecting whether the first switch 11 or the second switch 13 is abnormally turned on, the circuit breaker 10 can also be used to measure the insulation resistance.

Please refer to FIG. 2 , which is a schematic circuit diagram of a battery breaker according to another embodiment of the present invention. As shown in FIG. 2 , the battery breaker 40 is electrically connected between the power source 50 and the load 60 . The battery breaker 40 has a first switch 41 , a second switch 43 , a third switch 47 and a fourth switch 49 and a processor 45 . The power supply 50 has a first terminal 51 and a second terminal 53, such as a positive terminal and a negative terminal. The load 60 is an electrical component inside the electric vehicle, such as a DC-to-DC converter, an electronic controller, a secondary side module, a motor, an instrument, a lamp or other electrical components, which are not limited in this embodiment. The first terminal 51 and the second terminal 53 of the power source 50 are electrically connected to a low voltage level, such as a vehicle body or other suitable places. There is a first insulation impedance Z3 between the first end 51 of the power supply 50 and the low voltage level, and there is a second insulation impedance Z4 between the second end 53 of the power supply 50 and the low voltage level. For the convenience of description, the The low voltage level is shown by the ground terminal, but not limited thereto.

The first switch 41 is disposed on the first current path P3 between the first end 51 of the power source 50 and the load 60 . The second switch 43 is disposed on the second current path P4 between the second end 53 of the power source 50 and the load 60 . The third switch 47 has a first equivalent resistance and is connected in parallel with the first insulation resistance Z3. The fourth switch 49 has a second equivalent resistance and is connected in parallel with the second insulation resistance Z4. For convenience of description, in FIG. 2 , the equivalent resistance of the third switch 47 is represented by the resistance Rc, and the equivalent resistance of the fourth switch 49 is represented by the resistance Rd. In other embodiments, the battery breaker 40 may also have a first resistor and a second resistor, the first resistor is connected in series with the third switch 47 , and the second resistor is connected in series with the fourth switch 49 . In other words, the resistor Rc in FIG. 2 may also represent the first resistor, and the resistor Rd may also represent the second resistor, which is not limited in this embodiment.

The processor 45 is electrically connected to one of the first current path P3 and the second current path P4 for controlling the third switch 47 and the fourth switch 49, and when the third switch 47 and the fourth switch 49 are selectively turned on , the processor 45 determines the magnitude of the first insulation resistance Z3 and the second insulation resistance Z4 according to the voltage value of one of the first current path P3 and the second current path P4. In FIG. 2, the processor 45 is electrically connected to the first current path P3 and the second current path P4. In actual applications, only the processor 45 can be electrically connected to the first current path P3 and the second current path P4 according to actual needs. One of the second current paths P4 is not limited in this embodiment.

In FIG. 2 , the battery breaker 40 further has a first internal impedance Re and a second internal impedance Rf. The first internal impedance Re is located between the first switch 41 and the load 60, and is electrically connected between the first current path P3 and the reference potential terminal. The second internal impedance Rf is located between the second switch 43 and the load 60, and is electrically connected between the second current path P4 and the reference potential terminal. That is to say, the first internal impedance Re is the equivalent impedance between the first current path P3 of the battery breaker 40 and the low voltage level, and the second internal impedance Rf is the equivalent impedance between the second current path P4 of the battery breaker 40 and the low voltage level. Equivalent impedance between levels. Showing the first internal impedance Re and the second internal impedance Rf in the icon of this embodiment is for the convenience of description, not to limit this embodiment, that is, the first internal impedance Re and the second internal impedance can be canceled in other embodiments. Setting of internal impedance Rf. The first internal impedance Re and the second internal impedance Rf are, for example, other stray resistances in the electric vehicle or other suitable resistances, which are not limited in this embodiment.

In the drawings of this embodiment, the first switch 41, the second switch 43, the third switch 47, and the fourth switch 49 are shown with simple switch symbols, but in actual examples, the first switch 41, the second switch 43. The third switch 47 and the fourth switch 49 may be transistors, relays or other suitable switching circuits or components, which are not limited in this embodiment. In addition, the first switch 41 and the second switch 43 are selectively turned on under the control of the enable signal, for example, when the electric vehicle is started, the electric vehicle's electric door is opened (key on) and electric door is closed (key off) signal. When the first switch 41 and the second switch 43 are turned on, the power source 50 supplies power to the load 60 through the battery breaker 40 .

When the battery circuit breaker 40 is to measure the first insulation resistance Z3 and the second insulation resistance Z4, first, as shown in FIG. The four switches 49 are selectively turned on to measure the voltage value of the first current path P3 or the second current path P4. Taking the measurement of the first current path P3 as an example, when the third switch 47 is turned on and the fourth switch 49 is turned off, the processor 45 measures the first current path P3 to obtain the first detection voltage of the first current path P3 value. When the third switch 47 is turned off and the fourth switch 49 is turned on, the processor 45 measures the second current path P4 to obtain a second detected voltage value of the second current path P4. Afterwards, the processor 45 determines the magnitudes of the first insulation resistance Z3 and the second insulation resistance Z4 according to the first detection voltage value, the second detection voltage value, and the resistance values of the resistors Rc and Rd.

That is to say, regardless of whether the resistance value of the resistor Rc is the equivalent resistance value of the third switch 47 or the resistance value of the first resistor, the resistance value of the resistor Rc can be obtained in advance and stored in the processor 45. Similarly, the resistance value of the resistor Rd The resistance value of is also obtained in advance and stored in the processor 45 . The processor 45 obtains the first detected voltage value and the second detected voltage value of the first current path P3, the first detected voltage value is in the loop formed by the power supply 50, the first insulation impedance Z3, the resistor Rc and the second insulation impedance Z4 , the first insulation impedance Z3 is divided in parallel with the resistance Rc. The second detection voltage value is the divided voltage of the first insulation resistance Z3 in the loop formed by the power supply 50 , the first insulation resistance Z3 , the resistor Rd and the second insulation resistance Z4 . The processor 45 can calculate the magnitudes of the first insulation resistance Z3 and the second insulation resistance Z4 according to the first detection voltage value, the second detection voltage value and the known resistance values of the resistors Rc and Rd.

Similarly, when the first switch 41 and the second switch 43 are turned on, the processor 45 can also control the third switch 47 and the fourth switch 49 to selectively turn on, so as to follow the first current path P3 or the second current path P3. The voltage value of the path P4 is used to determine the magnitudes of the first insulation resistance Z3 and the second insulation resistance Z4. When the first switch 41 and the second switch 43 are turned on, in the loop formed by the power supply 50, the first insulation resistance Z3, the resistance Rc, the first internal resistance Re, the second insulation resistance Z4 and the second internal resistance Rf, the first A detection voltage value is the divided voltage of the first insulation impedance Z3 paralleled with the resistor Rc and the first internal impedance Re. In the loop formed by the power supply 50, the first insulation resistance Z3, the first internal resistance Re, the second insulation resistance Z4, the resistance Rd and the second internal resistance Rf, the second detection voltage value is the first insulation resistance Z3 connected in parallel with the first internal resistance The voltage divider of the resistance Re.

The processor 45 calculates the first insulation resistance Z3 and the first insulation resistance Z3 and the second resistance value by the first detection voltage value, the second detection voltage value and the stored resistance values of resistance Rc, resistance Rd, first internal resistance Re and second internal resistance Rf. 2. The size of the insulation resistance Z4. Accordingly, the processor 45 can control the switching and conduction of the third switch and the fourth switch before or during the driving of the electric vehicle to determine the magnitude of the first insulation impedance Z3 and the second insulation impedance Z4, so as to ensure that the electric vehicle Protection effect of power system.

In one embodiment, the processor 45 is electrically connected to the alarm. When the impedance values of the first insulation impedance Z3 and the second insulation impedance Z4 of the processor 45 are lower than a preset threshold, the warning device issues an impedance abnormal warning, for example displayed on the dashboard of the electric vehicle. The preset threshold can be set according to the insulation resistance requirement of the electric vehicle, such as 200KΩ or other suitable resistance values.

Furthermore, when the first switch 41 and the second switch 43 are controlled by the enabling signal and switched from on to off, the processor 45 controls the third switch 47 and the fourth switch 49 to turn off, and according to the first current path P3 and a voltage value of one of the second current paths P4 and a preset voltage value to determine whether one of the first switch 41 and the second switch 43 is abnormally turned on. In more detail, when the first switch 41 and the second switch 43 are turned off, if the first switch 41 and the second switch 43 are normally turned off, the voltage value of the first current path P3 is the power source 50, the first insulation resistance Z3 The voltage division of the first insulation resistance Z3 in the loop formed by the second insulation resistance Z4 and the second insulation resistance Z4. When one of the first switch 41 and the second switch 43 is abnormally turned on, the voltage value of the first current path P3 will be different from the voltage value when it is normally turned off.

For example, when the first switch 41 is abnormally turned on, in the loop formed by the power source 50, the first insulation resistance Z3, the first internal resistance Re and the second insulation resistance Z4, the voltage value of the first current path P3 is The first insulation resistance Z3 is connected in parallel with the divided voltage of the first internal resistance Re. When the second switch 43 is abnormally turned on, the voltage value of the first current path P3 is equal to that of the first insulation resistance Z3 in the loop formed by the power supply 50, the first insulation resistance Z3, the second insulation resistance Z4 and the second internal resistance Rf Partial pressure.

In other words, when the first switch 41 is abnormally turned on, the voltage value of the first current path P3 is smaller than the voltage value of the first current path P3 when it is normally turned off. When the second switch 43 is abnormally turned on, the voltage value of the first current path P3 is greater than the voltage value of the first current path P3 when it is normally turned off. Therefore, taking the voltage value of the first current path P3 when it is normally off as a preset voltage value, when the processor 45 judges that one of the first switch 41 and the second switch 43 is abnormally turned on, the processor 45 compares the first switch 41 and the second switch 43. The magnitude of the voltage value of the current path P3 and the preset voltage value can be used to determine whether the first switch 41 is abnormally conducted or the second switch 43 is abnormally conducted.

In this embodiment, the situation of abnormal conduction may be failure, welding or other conditions of the first switch or the second switch. In addition, in this embodiment, the voltage value of the first current path P3 is compared with the preset voltage value. In other embodiments, the voltage value of the second current path P4 can also be compared with another preset voltage value, or both Comparing the first current path P3 and the second current path P4 to determine whether the abnormal conduction of the first switch 41 or the abnormal conduction of the second switch 43 occurs, which is not limited in this embodiment.

Please refer to FIG. 3 together. FIG. 3 is a schematic diagram of a preset voltage waveform and an actual voltage waveform according to an embodiment of the present invention. As shown in the figure, the preset voltage value in the foregoing embodiments may also be the preset voltage waveform shown by the dotted line in FIG. 3 . That is to say, when the first switch 41 and the second switch 43 are turned off, if the first switch 41 and the second switch 43 are normally turned off, the processor 45 controls the third switch 47 to be turned off, and when the fourth switch 49 is turned on, The voltage of the first current path P3 is shown by the dotted line in the first interval Int1. The processor 45 controls the third switch 47 to be turned off, and when the fourth switch 49 is turned off, the voltage of the first current path P3 will be shown by the dotted line in the second interval Int2. The processor 45 controls the third switch 47 to be turned on, and when the fourth switch 49 is turned off, the voltage of the first current path P3 will be shown by the dotted line in the third interval Int3.

When the first switch 41 and the second switch 43 are abnormally turned on, and the processor 45 controls the third switch 47 to be turned off and the fourth switch 49 to be turned on, the voltage of the first current path P3 will be as real in the first interval Int1. line shown. When the first switch 41 and the second switch 43 are abnormally turned on, and the processor 45 controls the third switch 47 to be turned off and the fourth switch 49 to be turned off, the voltage of the first current path P3 will be as the solid line in the second interval Int2 shown. When the first switch 41 and the second switch 43 are abnormally turned on, and the processor 45 controls the third switch 47 to be turned on and the fourth switch 49 to be turned off, the voltage of the first current path P3 will be as real in the third interval Int3. line shown. Accordingly, the processor 45 can determine whether one of the first switch 41 and the second switch 43 is abnormally turned on according to the difference between the actual voltage waveform on the first current path P3 and the preset voltage waveform. Moreover, as mentioned above, the processor 45 can also determine whether the first switch 41 is abnormally turned on or the second switch 43 is abnormally conducted according to whether the voltage level of the actual voltage waveform is higher or lower than the preset voltage waveform voltage level. Abnormal conduction occurs.

Therefore, in addition to judging whether the internal switch is abnormally conducted by the battery breaker 40 , the battery breaker 40 can also measure the insulation resistance in real time before, during and after the electric vehicle is running.

In order to describe the method for detecting abnormal conduction of the battery breaker switch more clearly, please refer to FIG. 2 and FIG. 4 together. FIG. 4 is a flow chart showing the steps of a method for measuring insulation resistance according to an embodiment of the present invention. As shown in the figure, in step S701, the first switch 11 and the second switch 13 are selectively turned on according to the enable signal. In step S703, when the enable signal indicates that the first switch 11 and the second switch 13 are switched off, according to the voltage value and the preset voltage value of one of the first current path P1 and the second current path P2, it is determined that the second Whether one of the first switch 11 and the second switch 13 is abnormally turned on. In step S705, when it is judged that one of the first switch 11 and the second switch 13 is abnormally turned on, the voltage value of one of the first current path P1 and the second current path P2 is compared with the preset voltage value , judging whether the first switch 11 is abnormally turned on or the second switch 13 is abnormally turned on. The judging methods described in the present invention have actually been disclosed in the aforementioned embodiments, and will not be described repeatedly in this embodiment.

In another embodiment, please refer to FIG. 2 and FIG. 5 together. FIG. 5 is a flowchart of steps of a method for measuring insulation resistance according to an embodiment of the present invention. As shown in the figure, in step S801, the first switch 41 and the second switch 43 are selectively turned on according to the enable signal. In step S803 , when the processor 45 controls the third switch 47 to be turned on and the fourth switch 49 to be turned off, a first detected voltage value of one of the first current path P3 and the second current path P4 is obtained. In step S805 , when the processor 45 controls the third switch 47 to be turned off and the fourth switch 49 to be turned on, a second detection voltage value of one of the first current path P3 and the second current path P4 is obtained. In step S807, according to the first detection voltage value, the second detection voltage value, the first equivalent resistance value of the third switch 47 and the second equivalent resistance value of the fourth switch 49, the first insulation resistance Z3 and the second insulation resistance Z3 are determined. 2. The size of the insulation resistance Z4. In step S809, when the processor 45 controls the third switch 47 to be turned off, the fourth switch 49 to be turned off and the enabling signal indicates that the first switch 41 and the second switch 43 are switched to be turned off, according to the first current path P3 and the second current The voltage value of one of the paths P4 and the preset voltage value are used to determine whether one of the first switch 41 and the second switch 43 is abnormally turned on. In step S811, when it is judged that one of the first switch 41 and the second switch 43 is abnormally turned on, the voltage value of one of the first current path P3 and the second current path P4 is compared with the preset voltage value , it is judged that the first switch 41 is abnormally turned on or the second switch 43 is not normally turned on. The judging methods described in the present invention have actually been disclosed in the aforementioned embodiments, and will not be described repeatedly in this embodiment.

In summary, embodiments of the present invention provide a battery circuit breaker capable of detecting abnormal conduction of switches and a detection method thereof. When the first switch and the second switch are switched from on to off, the processor detects that the second switch is The voltage on the first current path and the second current path is used to determine whether one of the first switch or the second switch is abnormally turned on, so that the battery circuit breaker can detect whether the internal switch is abnormally turned on, and then issue a warning Notify the situation of abnormal conduction of the switch. In another embodiment, the battery circuit breaker connects the third switch in parallel with the first insulation impedance, connects the fourth switch in parallel with the second insulation impedance, and controls the switching conduction of the third switch and the fourth switch by the processor. According to the voltage value of one of the first current path and the second current path, the size of the first insulation resistance and the second insulation resistance can be judged, so as to ensure the protection effect of the electric vehicle power system.

Claims (10)

1. the battery circuit breaker of the abnormal conducting of a kind of detectable switch, it is characterised in that including：

One first switch, be arranged at the first end of a power supply and one load between one first current path, the first switch according to Turned on according to an enable signal-selectivity；

One second switch, is arranged at one second current path between the second end of the power supply and the load, the second switch according to Turned on according to the enable signal-selectivity；And

One processor, is electrically connected with one of first current path and second current path, when the enable signal designation When the first switch and the second switch switch to cut-off, the processor is according to first current path and second current path The magnitude of voltage and a preset voltage value of one of them, judge whether one of the first switch and the second switch are abnormal and lead It is logical, and when the abnormal conducting of one of the first switch and the second switch is judged, the processor compares first electric current The magnitude of voltage in one of path and second current path and the size of the preset voltage value, judge that the first switch is abnormal Conducting or the abnormal conducting of the second switch.

2. the battery circuit breaker of the abnormal conducting of detectable switch as claimed in claim 1, it is characterised in that further include：

One the 3rd switch, with one first equivalent resistance, is parallel to one first insulation impedance, and first insulation impedance electrically connects It is connected between the first end of the power supply and a reference potential end；And

One the 4th switch, with one second equivalent resistance, is parallel to one second insulation impedance, and second insulation impedance electrically connects It is connected between the second end of the power supply and the reference potential end.

3. the battery circuit breaker of the abnormal conducting of detectable switch as claimed in claim 2, it is characterised in that the processor is more It is used to control the 3rd switch and the 4th switch, when the 3rd switch and the 4th switch are selectively turned on, the treatment Device according to one of first current path and second current path magnitude of voltage, judge first insulation impedance and this The size of two insulation impedances.

4. the battery circuit breaker of the abnormal conducting of switch as claimed in claim 3 detectable, it is characterised in that open when the 3rd Conducting is closed, during the 4th switch cut-off, the processor measures one of first current path and second current path One first detection voltage value, when the 3rd switch cut-off, during four switch conductions, the processor measures first current path And one second detection voltage value of one of second current path, the processor according to the first detection voltage value, this Two detection voltage values, first equivalent resistance and second equivalent resistance, judge first insulation impedance and this are second exhausted The size of edge impedance.

5. the battery circuit breaker of the abnormal conducting of switch as claimed in claim 2 detectable, it is characterised in that further include one the One resistance and a second resistance, the first resistor are series at the 3rd switch, and the second resistance is series at the 4th switch.

6. the battery circuit breaker of the abnormal conducting of switch as claimed in claim 1 detectable, it is characterised in that further include one the One internal driving and one second internal driving, first internal driving are located between the first switch and the load, and are electrically connected Be connected between first current path and the reference potential end, second internal driving be located at the second switch and the load it Between, and be electrically connected between second current path and the reference potential end.

7. a kind of method of the abnormal conducting of switch for detecting battery circuit breaker a, it is adaptable to battery circuit breaker, battery open circuit Device includes a first switch and a second switch, and the first switch is arranged at one the between the first end of a power supply and a load One current path, the second switch is arranged at one second current path between the second end of the power supply and the load, its feature It is that the detection method includes：

According to the conducting of an enable signal-selectivity ground first switch and the second switch；

When the enable signal designation first switch and the second switch switch to cut-off, according to first current path and should The magnitude of voltage of one of the second current path and a preset voltage value, judge one of the first switch and the second switch Whether abnormal conducting；And

When the abnormal conducting of one of the first switch and the second switch is judged, compare first current path and this The magnitude of voltage of one of two current paths and the size of the preset voltage value, judge the abnormal conducting of the first switch or this The abnormal conducting of two switches.

8. the method for detecting the abnormal conducting of switch of battery circuit breaker as claimed in claim 7, it is characterised in that the battery Breaker further includes one the 3rd switch and one the 4th switch, and the 3rd switch has one first equivalent resistance, and is parallel to one First insulation impedance, the 4th switch has one second equivalent resistance, and is parallel to one second insulation impedance, first insulation Impedance is electrically connected between the first end of the power supply and a reference potential end, and second insulation impedance is electrically connected at the power supply The second end and the reference potential end between, the detection method includes：

Selectively turn on the 3rd switch and the 4th switch；And

According to the magnitude of voltage of one of first current path and second current path, judge first insulation impedance and be somebody's turn to do The size of the second insulation impedance.

9. the method for detecting the abnormal conducting of switch of battery circuit breaker as claimed in claim 8, it is characterised in that in judgement The step of size of first insulation impedance and second insulation impedance, includes：

When the 3rd switch conduction, the 4th switch cut-off, first current path and second current path are obtained wherein One of one first detection voltage value；

When the 3rd switch cut-off, during four switch conductions, first current path and second current path are obtained wherein One of one second detection voltage value；And

According to the first detection voltage value, the second detection voltage value, first equivalent resistance and second equivalent resistance, Judge first insulation impedance and the size of second insulation impedance.

10. the method for detecting the abnormal conducting of switch of battery circuit breaker as claimed in claim 8, it is characterised in that the electricity Pond breaker further includes a first resistor and a second resistance, and the first resistor is series at the 3rd switch, the second resistance string Be coupled to the 4th switch, according to the first detection voltage value and the second detection voltage value, judge first insulation impedance and In the step of size of second insulation impedance, more according to the first resistor and the resistance value of the second resistance, judge this first The size of insulation impedance and second insulation impedance.