Battery-insulated virtual pressure detection circuit, virtual pressure detection method, and electronic device

Abstract

The application discloses a kind of battery insulation virtual pressure detection circuit, virtual pressure detection method and electronic equipment, the virtual pressure detection circuit includes insulation detection circuit, voltage acquisition circuit, main positive relay, main negative relay and control module, insulation detection operation is executed to battery module by insulation detection circuit to make battery module be in insulation state, when battery module is in insulation state, the first voltage of main positive relay and the second voltage of main negative relay are collected by voltage acquisition circuit, and first voltage and second voltage are transmitted to control module, and the virtual pressure detection result is determined according to first voltage and second voltage by control module. Visible, the virtual pressure problem of battery can be detected by first voltage and second voltage in the embodiment of the application, the accuracy and efficiency of virtual pressure detection can be improved, further, the virtual pressure problem can be solved when battery exists virtual pressure problem, and then it is favorable to improve the safety and stability of battery system operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery detection, in particular to a virtual voltage detection circuit for battery insulation, a virtual voltage detection method and an electronic device. BACKGROUND

[0002] In actual life, in the field of new energy electric vehicle battery management, the insulation detection of the battery pack is usually carried out through the topology form of the half-bridge topology. The half-bridge topology insulation detection circuit can control the on-off of a photo-coupler through a GPIO port, thereby realizing the function of insulation detection. However, the implementation of insulation detection in this way will cause a virtual voltage between the back end of the main positive relay and the inner side of the main negative relay (wherein the virtual voltage problem refers to the phenomenon that when a high-impedance ammeter measures an unpowered conductor, there is still a certain voltage due to factors such as long-distance proximity and side-by-side of the alternating current conductor, but when the load is actually connected, there is no voltage), which will cause the problem of virtual voltage in the entire battery pack system. If there is a virtual voltage problem in the battery pack system, it will affect the operating voltage of the battery pack, thereby causing instability in the operation and use of the battery pack, and further causing low safety and stability of the operation of the battery management system. Therefore, it is particularly important to provide a new detection method to improve the accuracy and efficiency of virtual voltage detection, thereby improving the accuracy and intelligence of solving the virtual voltage problem, and further improving the safety and stability of the operation of the battery management system. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a virtual voltage detection circuit for battery insulation, a virtual voltage detection method and an electronic device, which can detect the virtual voltage problem of the battery, improve the accuracy and efficiency of virtual voltage detection, further perform matching processing operation according to the virtual voltage detection result of the battery to eliminate the virtual voltage existing in the battery, and improve the safety and stability of the operation of the battery system.

[0004] In order to solve the above technical problems, the present application discloses a virtual voltage detection circuit for battery insulation, which comprises an insulation detection circuit, a voltage acquisition circuit, a main positive relay, a main negative relay and a control module, wherein:

[0005] The first end of the insulation detection circuit is electrically connected to the first end of the main positive relay, and the first end of the insulation detection circuit is used for electrically connecting the first end of the battery module. The second end of the main positive relay is electrically connected to the first end of the voltage acquisition circuit. The second end of the voltage acquisition circuit is electrically connected to the main negative relay. The third end of the voltage acquisition circuit is electrically connected to the first end of the control module. The second end of the insulation detection circuit is used for electrically connecting the second end of the battery module, and the second end of the insulation detection circuit is used for grounding.

[0006] The insulation detection circuit is configured to perform an insulation detection operation on the battery module so that the battery module is in an insulation state.

[0007] The voltage collection circuit is configured to collect a first voltage of the main positive relay and a second voltage of the main negative relay when the battery module is in the insulation state, and transmit the first voltage and the second voltage to the control module.

[0008] The control module is configured to determine a virtual voltage detection result according to the first voltage and the second voltage.

[0009] As an optional implementation, in the first aspect of the present application, the virtual voltage detection circuit further comprises a virtual voltage processing circuit, wherein:

[0010] The first end of the virtual voltage processing circuit is electrically connected to the fourth end of the voltage collection circuit, and the second end of the virtual voltage processing circuit is electrically connected to the second end of the control module.

[0011] The control module is further configured to generate a virtual voltage processing control signal according to the virtual voltage detection result, and transmit the virtual voltage processing control signal to the virtual voltage processing circuit.

[0012] The virtual voltage processing circuit is configured to perform a virtual voltage processing operation matched with the virtual voltage processing control signal according to the virtual voltage processing control signal.

[0013] As an optional implementation, in the first aspect of the present application, the virtual voltage detection circuit further comprises a pre-charge circuit, wherein:

[0014] The first end of the pre-charge circuit is electrically connected to the third end of the main positive relay, and the second end of the pre-charge circuit is electrically connected to the fourth end of the main positive relay.

[0015] The pre-charge circuit is configured to protect the main positive relay to avoid that a high current flowing through the main positive relay instantaneously when the power is turned on, so that the main positive relay is damaged.

[0016] As an optional implementation, in the first aspect of the present application, the virtual voltage processing circuit comprises an optocoupler, wherein:

[0017] The first end of the optocoupler is electrically connected to the fourth end of the voltage collection circuit, the second end of the optocoupler is electrically connected to the fifth end of the voltage collection circuit, and the third end of the optocoupler is electrically connected to the fourth end of the control module.

[0018] The optocoupler is configured to perform a turn-on operation or a turn-off operation matched with the virtual voltage processing control signal according to the virtual voltage processing control signal.

[0019] As an optional implementation, in the first aspect of the present application, the pre-charge circuit comprises a pre-charge resistor and a pre-charge relay, wherein:

[0020] The first end of the pre-charge resistor is electrically connected to the third end of the main positive relay, the second end of the pre-charge resistor is electrically connected to the first end of the pre-charge relay, and the second end of the pre-charge relay is electrically connected to the fourth end of the main positive relay.

[0021] As an optional implementation, in the first aspect of the present application, the voltage acquisition circuit comprises a first voltage dividing resistor, a second voltage dividing resistor, and a voltage acquisition unit, wherein:

[0022] The first end of the first voltage dividing resistor is electrically connected to the second end of the main positive relay and the first end of the voltage acquisition unit, respectively, the second end of the first voltage dividing resistor is electrically connected to the first end of the second voltage dividing resistor, the second end of the second voltage dividing resistor is electrically connected to the second end of the voltage acquisition unit and the main negative relay, respectively, and the third end of the voltage acquisition unit is electrically connected to the first end of the control module.

[0023] As an optional implementation, in the first aspect of the present application, the insulation detection circuit comprises a first insulation resistor, a second insulation resistor, a first bridge arm matching resistor, a second bridge arm matching resistor, a third bridge arm matching resistor, a fourth bridge arm matching resistor, a first insulation detection switch, a second insulation detection switch, and a third insulation detection switch, wherein:

[0024] The first end of the first insulation resistor is electrically connected to the first end of the main positive relay, the first end of the first insulation detection switch, and a first end for electrically connecting the battery module, the second end of the first insulation resistor is electrically connected to the first end of the second insulation detection switch and the first end of the second insulation resistor, the second end of the first insulation detection switch is electrically connected to the first end of the first bridge arm matching resistor, the second end of the first bridge arm matching resistor is electrically connected to the first end of the second bridge arm matching resistor and the first end of the third insulation detection switch, respectively, the second end of the second bridge arm matching resistor is electrically connected to the second end of the second insulation detection switch and the first end of the third bridge arm matching resistor, respectively, the second end of the third bridge arm matching resistor is electrically connected to the first end of the fourth bridge arm matching resistor, and the second end of the second insulation resistor is electrically connected to the second end of the fourth bridge arm matching resistor, the second end of the third insulation detection switch, and the second end of the battery module for grounding.

[0025] As an optional implementation, in the first aspect of the present application, the voltage acquisition circuit further comprises a third insulation resistor and a fourth insulation resistor, wherein:

[0026] The first end of the third insulation resistor is electrically connected to the first end of the first voltage division resistor, the second end of the third insulation resistor is electrically connected to the first end of the fourth insulation resistor, and the second end of the fourth insulation resistor is electrically connected to the second end of the second voltage division resistor.

[0027] As an optional implementation, in the first aspect of the application, the virtual voltage processing circuit further comprises a triode, a first capacitor, a first resistor and a second resistor, wherein:

[0028] The third end of the optocoupler is electrically connected to the first end of the first resistor and the first end of the second resistor, respectively, the second end of the first resistor is used for electrically connecting an input power supply, the fourth end of the optocoupler is electrically connected to the second end of the second resistor and the collector of the triode, respectively, the emitter of the triode is electrically connected to the first end of the first capacitor and used for grounding, and the base of the triode is electrically connected to the second end of the first capacitor and the fourth end of the control module, respectively.

[0029] The control module is an MCU chip.

[0030] The second aspect of the application discloses a virtual voltage detection method for battery insulation, which is applied to a virtual voltage detection circuit for battery insulation, wherein the virtual voltage detection circuit comprises an insulation detection circuit, a voltage acquisition circuit, a main positive relay, a main negative relay and a control module, and the method comprises:

[0031] The insulation detection circuit performs an insulation detection operation on a battery module, so that the battery module is in an insulation state;

[0032] When the battery module is in the insulation state, the voltage acquisition circuit acquires a first voltage of the main positive relay and a second voltage of the main negative relay, and transmits the first voltage and the second voltage to the control module;

[0033] The control module determines a virtual voltage detection result according to the first voltage and the second voltage.

[0034] As an optional implementation, in the second aspect of the application, the virtual voltage detection circuit further comprises a virtual voltage processing circuit.

[0035] And the method further comprises:

[0036] The control module generates a virtual voltage processing control signal according to the virtual voltage detection result, and transmits the virtual voltage processing control signal to the virtual voltage processing circuit, so as to trigger the virtual voltage processing circuit to perform a virtual voltage processing operation matched with the virtual voltage processing signal according to the virtual voltage processing signal.

[0037] As an optional implementation, in the second aspect of the present application, the virtual voltage detection circuit further comprises a pre-charge circuit.

[0038] And the method further comprises:

[0039] When the power is turned on, the current flows through the pre-charge circuit to the main positive relay, so as to avoid the instant high current flowing through the main positive relay when the power is turned on, which damages the main positive relay.

[0040] The third aspect of the present application discloses an electronic device, characterized in that the electronic device comprises the battery insulation virtual voltage detection circuit of any one of the first aspect.

[0041] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0042] In the embodiments of the present application, the virtual voltage detection circuit comprises an insulation detection circuit, a voltage acquisition circuit, a main positive relay, a main negative relay and a control module. The insulation detection circuit performs an insulation detection operation on the battery module so that the battery module is in an insulation state. When the battery module is in the insulation state, the voltage acquisition circuit acquires a first voltage of the main positive relay and a second voltage of the main negative relay, and transmits the first voltage and the second voltage to the control module. The control module determines a virtual voltage detection result according to the first voltage and the second voltage. As can be seen, by collecting the first voltage of the main positive relay and the second voltage of the main negative relay, the virtual voltage problem of the battery can be detected, the accuracy and efficiency of virtual voltage detection can be improved, further processing operations can be performed according to the virtual voltage detection result of the battery, the virtual voltage problem can be effectively solved when the battery has a virtual voltage problem, and the safety and stability of the battery system operation can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0044] Figure 1 is a structural schematic diagram of a battery insulation virtual voltage detection circuit disclosed by the embodiments of the present application;

[0045] Figure 2 is a structural schematic diagram of another battery insulation virtual voltage detection circuit disclosed by the embodiments of the present application;

[0046] Figure 3is a structural schematic view of another battery insulation virtual voltage detection circuit disclosed by the embodiment of the present application;

[0047] Figure 4 is a structural schematic view of a voltage collection circuit disclosed by the embodiment of the present application;

[0048] Figure 5 is a structural schematic view of an insulation detection circuit disclosed by the present application;

[0049] Figure 6 is a structural schematic view of a virtual voltage processing circuit disclosed by the present application;

[0050] Figure 7 is a flow schematic view of a battery insulation virtual voltage detection method disclosed by the present application;

[0051] Figure 8 is a structural schematic view of an electronic device disclosed by the embodiment of the present application. DETAILED DESCRIPTION

[0052] In order to make the personnel in the art better understand the present application scheme, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor fall within the scope of protection of the present application.

[0053] The terms "first", "second", and the like in the specification of the present application and the above-mentioned drawings are used to distinguish different objects, not to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, device, product, or end including a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed or can optionally include other steps or units inherent to the process, method, product, or end.

[0054] In this paper, the phrase "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. The person skilled in the art explicitly and implicitly understands that the embodiments described herein can be combined with other embodiments.

[0055] The application discloses a battery insulation virtual voltage detection circuit, a battery insulation virtual voltage detection method and electronic equipment, which can detect the virtual voltage problem of the battery through the collected first voltage of the main positive relay and the second voltage of the main negative relay, improve the accuracy and efficiency of virtual voltage detection, further perform matching processing operation according to the virtual voltage detection result of the battery, effectively solve the virtual voltage problem when the virtual voltage problem of the battery is detected, and further improve the safety and stability of the battery system operation.

[0056] Embodiment one

[0057] Please refer to Figure 1 , Figure 1 is a structural schematic diagram of a battery insulation virtual voltage detection circuit 10 disclosed by the embodiment of the application. As shown in Figure 1 , the battery insulation virtual voltage detection circuit 10 comprises an insulation detection circuit 101, a voltage acquisition circuit 102, a main positive relay 103, a main negative relay 104 and a control module 105, wherein:

[0058] The first end of the insulation detection circuit 101 is electrically connected to the first end of the main positive relay 103, and the first end of the insulation detection circuit 101 is used for electrically connecting the first end of the battery module; the second end of the main positive relay 103 is electrically connected to the first end of the voltage acquisition circuit 102; the second end of the voltage acquisition circuit 102 is electrically connected to the main negative relay 104; the third end of the voltage acquisition circuit 102 is electrically connected to the first end of the control module 105; the second end of the insulation detection circuit 101 is used for electrically connecting the second end of the battery module and is used for grounding;

[0059] The insulation detection circuit 101 is used for performing insulation detection operation on the battery module, so that the battery module is in an insulation state.

[0060] The voltage acquisition circuit 102 is used for acquiring the first voltage of the main positive relay 103 and the second voltage of the main negative relay 104 when the battery module is in the insulation state, and transmitting the first voltage and the second voltage to the control module.

[0061] The control module 105 is used for determining a virtual voltage detection result according to the first voltage and the second voltage.

[0062] In the embodiment of the present application, the control module is an MCU chip. The MCU (Microcontroller Unit; MCU) chip is a micro control unit, also known as a single chip microcomputer or a single chip machine. It is a chip-level computer formed by integrating a central processing unit (CPU) with a frequency and specification appropriately reduced, a memory, a counter, a USB, an A / D converter, a UART, a PLC, a DMA, and even an LCD driving circuit on a single chip, for different application scenarios to make different combinations of control.

[0063] In the embodiment of the present application, further optionally, the virtual voltage detection result includes whether the battery module has a virtual voltage and a cause of the virtual voltage of the battery module.

[0064] In the embodiment of the present application, optionally, when the insulation detection is started, the total voltage of the battery module flows to the main positive relay and the main negative relay. The first voltage outside the main positive relay and the second voltage inside the main negative relay are collected by the voltage collection circuit, and the control module analyzes the first voltage and the second voltage to obtain the virtual voltage detection result. Further optionally, when the battery module is in an insulation state, the main positive relay and the main negative relay are in an open state.

[0065] It can be seen that the implementation Figure 1The described battery insulation virtual pressure detection circuit 10 can insulate the battery module by the insulation detection circuit 101 to make the battery module in an insulation state, and when the battery module is in an insulation state, the first voltage of the main positive relay 103 and the second voltage of the main negative relay 104 are collected by the voltage collection circuit 102, the first voltage and the second voltage are transmitted to the control module 105, and the control module 105 determines the virtual pressure detection result according to the first voltage and the second voltage. According to the collected outer voltage of the main positive relay 103 and the inner voltage of the main negative relay 104, it can be determined whether there is a virtual pressure condition in the circuit and the cause of the virtual pressure in the circuit. Compared with the prior art, when insulation detection is implemented, the voltage between the positive end and the negative end of the high-voltage connector is usually detected to detect the virtual pressure. This has the problem of low accuracy of virtual pressure detection. The application can determine the virtual pressure detection result by detecting the first voltage outside the main positive relay 103 and the second voltage inside the main negative relay 104, improve the accuracy of voltage collection of the main positive relay 103 and the main negative relay 104, and further improve the accuracy of determining the virtual pressure detection result based on the first voltage of the main positive relay 103 and the second voltage of the main negative relay 104. It can improve the accuracy and efficiency of virtual pressure detection. Further, the control module 105 can analyze the first voltage and the second voltage to determine the virtual pressure detection result, which can further improve the accuracy of virtual pressure detection and is beneficial to improve the safety and stability of the battery system operation.

[0066] In an optional embodiment, as shown in Figure 2 Figure 2 is another structure schematic view of the battery insulation virtual pressure detection circuit 10 disclosed by the embodiment of the application. The virtual pressure detection circuit 10 further comprises a virtual pressure processing circuit 106, wherein:

[0067] The first end of the virtual pressure processing circuit 106 is electrically connected to the fourth end of the voltage collection circuit 102, and the second end of the virtual pressure processing circuit 106 is electrically connected to the second end of the control module 105.

[0068] The control module 105 is further configured to generate a virtual pressure processing control signal according to the virtual pressure detection result, and transmit the virtual pressure processing control signal to the virtual pressure processing circuit 106.

[0069] The virtual pressure processing circuit 106 is configured to perform a virtual pressure processing operation matched with the virtual pressure processing control signal according to the virtual pressure processing control signal.

[0070] ​In the optional embodiment, optionally, when the control module 105 is configured to generate the virtual voltage processing control signal according to the virtual voltage detection result and transmit the virtual voltage processing control signal to the virtual voltage processing circuit 106, the control module is specifically configured to: determine whether the virtual voltage detection result indicates that there is a virtual voltage in the current circuit, when it is determined that the virtual voltage detection result indicates that there is a virtual voltage in the current circuit, analyze the target cause of the virtual voltage in the current circuit, and generate the virtual voltage processing control signal according to the target cause and transmit the virtual voltage processing control signal to the virtual voltage processing circuit 106.

[0071] In the optional embodiment, further optionally, the virtual voltage processing control signal includes a conduction control signal or a disconnection control signal.

[0072] It can be seen that by implementing the optional embodiment, the control module 105 can generate the virtual voltage processing control signal according to the virtual voltage detection result and transmit the virtual voltage processing control signal to the virtual voltage processing circuit 106, the virtual voltage processing circuit 106 can perform the virtual voltage processing operation matched with the virtual voltage processing control signal according to the virtual voltage processing control signal, the control module 105 and the virtual voltage processing circuit 106 can solve the virtual voltage problem in the circuit, compared with the prior art which can only detect whether there is a virtual voltage problem in the circuit, the application can not only determine the virtual voltage detection result by detecting the first voltage outside the main positive relay 103 and the second voltage inside the main negative relay 104, but also can improve the accuracy and efficiency of determining the virtual voltage detection result, and the control module 105 in the application can also generate the corresponding virtual voltage processing control signal and transmit the virtual voltage processing control signal to the virtual voltage processing circuit 106 to trigger the virtual voltage processing circuit 106 to perform the matched virtual voltage processing operation according to the virtual voltage processing control signal, the circuit between the main positive relay 103 outside the loop and the main negative relay 104 inside the loop in the loop can be disconnected to eliminate the virtual voltage problem in the circuit, the virtual voltage problem in the circuit can be effectively solved, and the safety and stability of the battery system operation can be improved.

[0073] In another optional embodiment, the virtual voltage detection circuit 10 further comprises a pre-charge circuit 107, wherein:

[0074] The first end of the pre-charge circuit 107 is electrically connected to the third end of the main positive relay 103, and the second end of the pre-charge circuit 107 is electrically connected to the fourth end of the main positive relay 103.

[0075] The pre-charge circuit 107 is used to protect the main positive relay 103 to avoid the instantaneous high current flowing through the main positive relay 103 when the power is turned on, so that the main positive relay 103 is damaged.

[0076] In the optional embodiment, the pre-charge circuit 107 is connected in parallel with the main positive relay 103. Further, after the pre-charge circuit 107 is connected in parallel with the main positive relay 103, when the power supply is connected, the current first passes through the pre-charge circuit 107 to reduce the current flowing into the main positive relay 103, so that the current flowing into the main positive relay 103 meets the current requirement of the main positive relay 103. Further, the pre-charge circuit 107 can protect the main positive relay 103 by being connected in parallel with the main positive relay 103. If the pre-charge circuit 107 does not exist in the circuit, the instantaneous current connected to the main positive relay 103 is too large, which can easily cause the contact of the main positive relay 103 to be ablated, and further can easily damage the main positive relay 103 and other circuit devices, resulting in unstable operation or low safety of the circuit.

[0077] It can be seen that by connecting the pre-charge circuit 107 included in the virtual voltage detection circuit 10 in parallel with the main positive relay 103, the main positive relay 103 can be protected in the optional embodiment, so as to avoid the instantaneous high current flowing through the main positive relay 103 when the power supply is connected, which can damage the main positive relay 103. Compared with the prior art, if the pre-charge circuit 107 does not exist in the circuit, the instantaneous current connected to the main positive relay 103 is too large, which can easily cause the contact of the main positive relay 103 to be ablated, and further can easily damage the main positive relay 103 and other circuit devices. By connecting the pre-charge circuit 107 in parallel with the main positive relay 103, the phenomenon that the current flowing into the main positive relay 103 is too large to damage the main positive relay 103 can be effectively prevented, the operation of the circuit device can be effectively protected, the safety and stability of the circuit operation can be improved, and further the safety and stability of the battery system operation can be improved.

[0078] In yet another optional embodiment, the virtual voltage processing circuit 106 includes a photo-coupler device 1061, wherein:

[0079] The first end of the photo-coupler device 1061 is electrically connected to the fourth end of the voltage acquisition circuit 102, the second end of the photo-coupler device 1061 is electrically connected to the fifth end of the voltage acquisition circuit 102, and the third end of the photo-coupler device 1061 is electrically connected to the fourth end of the control module 105.

[0080] The photo-coupler device 1061 is configured to perform a conduction operation or a turn-off operation matched with the virtual voltage processing control signal according to the virtual voltage processing control signal.

[0081] In the optional embodiment, the optocoupler 1061 comprises one of optocoupler, photosensitive triode, photodiode, and phototransistor. Further, the optocoupler is composed of a light-emitting source and a light receiver, and the light-emitting source and the light receiver are assembled in a same sealed shell and are isolated from each other by a transparent insulator. Further, a pin of the light-emitting source is an input end, and a pin of the light receiver is an output end.

[0082] In the optional embodiment, the control module 105 is an MCU chip. When the battery module is subjected to insulation detection, a virtual voltage processing signal for turning off the optocoupler 1061 is generated, so that a control signal MCU_GPIO of a GPIO port of the MCU chip is set to 0, so that the optocoupler U1M is in an off state, and the current loop from the outside of the main positive relay 103 to the inside of the main negative relay 104 is cut off, thereby solving the problem of virtual voltage existing on the outside of the main positive relay 103 during the insulation detection of the battery module. Further, when the insulation detection is completed, a virtual voltage processing signal for turning on the optocoupler 1061 is generated, so that the control signal MCU_GPIO of the GPIO port of the MCU chip is set to 1, so that the optocoupler U1M is in a closed and turned-on state, and after the optocoupler U1M is in the closed and turned-on state, the main positive relay 103 is closed, thereby restoring the conduction of the circuit.

[0083] It can be seen that by implementing the optional embodiment, the optocoupler 1061 can perform a conduction operation or an off operation matched with the virtual voltage processing control signal according to the virtual voltage processing control signal, so that the current loop from the outside of the main positive relay to the inside of the main negative relay is disconnected, and the problem of virtual voltage existing on the outside of the main positive relay and the inside of the main negative relay is solved. Compared with the prior art which can only detect virtual voltage but cannot eliminate virtual voltage, the present application can eliminate virtual voltage by controlling the optocoupler to perform an operation matched with the virtual voltage processing control signal, can eliminate the problem of virtual voltage existing in the circuit by performing an off operation of the optocoupler to disconnect the loop between the outside of the main positive relay and the inside of the main negative relay in the loop, can effectively solve the problem of virtual voltage existing in the circuit, and can further improve the safety and stability of the battery system.

[0084] In still another optional embodiment, the pre-charging circuit 107 comprises a pre-charging resistor 1071 and a pre-charging relay 1072, wherein:

[0085] The first end of the pre-charging resistor 1071 is electrically connected to the third end of the main positive relay 103, the second end of the pre-charging resistor 1071 is electrically connected to the first end of the pre-charging relay 1072, and the second end of the pre-charging relay 1072 is electrically connected to the fourth end of the main positive relay 103.

[0086] In the optional embodiment, the pre-charging resistor 1071 and the pre-charging relay 1072 are connected in series, one end of which is connected to the main positive relay 103, and the other end of which is connected to the main positive relay 103, that is, the pre-charging resistor 1071 and the pre-charging relay 1072 are connected in parallel with the main positive relay 103. When the battery module is connected to the power supply, the insulation of the high-voltage bus and the voltage of each battery are detected. If the detection is qualified, the pre-charging relay 1072 is turned on, and the current flows from the positive bus through the pre-charging resistor 1071 to charge the capacitor in the load first. When the voltage across the capacitor is detected to be close to the bus voltage, the positive bus relay is closed again, and then the pre-charging relay 1072 is turned off, and the battery module is formally powered externally. In this way, the pre-charging resistor 1071 and the pre-charging relay 1072 can protect the main positive relay 103 from damage or failure due to excessive instantaneous current.

[0087] It can be seen that by implementing the optional embodiment, the pre-charging resistor 1071 and the pre-charging relay 1072 included in the pre-charging circuit 107 can protect the main positive relay 103 from damage or failure due to excessive instantaneous current, effectively preventing the phenomenon of excessive current flowing into the main positive relay 103, effectively protecting the operation of circuit devices, and improving the safety and stability of circuit operation, thereby improving the safety and stability of the battery system operation.

[0088] In yet another optional embodiment, the voltage acquisition circuit 102 includes a first voltage dividing resistor 1022, a second voltage dividing resistor 1023, and a voltage acquisition unit 1021, wherein:

[0089] The first end of the first voltage dividing resistor 1022 is electrically connected to the second end of the main positive relay 103 and the first end of the voltage acquisition unit 1021, respectively. The second end of the first voltage dividing resistor 1022 is electrically connected to the first end of the second voltage dividing resistor 1023. The second end of the second voltage dividing resistor 1023 is electrically connected to the second end of the voltage acquisition unit 1021 and the main negative relay 103, respectively. The third end of the voltage acquisition unit 1021 is electrically connected to the first end of the control module 105.

[0090] In the optional embodiment, the voltage acquisition unit 1021 includes one of a voltage acquisition sensor and a voltage acquisition chip.

[0091] In the optional embodiment, the first voltage dividing resistor 1022 and the second voltage dividing resistor 1023 are voltage acquisition voltage dividing resistors for the total voltage outside the main positive relay 103, which can divide the voltage when the voltage acquisition unit 1021 acquires the total voltage outside the main positive relay 103.

[0092] It can be seen that by implementing the optional embodiment, the total voltage outside the main positive relay 103 can be divided by the first voltage dividing resistor 1022 and the second voltage dividing resistor 1023, the voltage on the outside loop of the main positive relay 103 can be adjusted, the voltage corresponding to a specific point in the outside loop of the main positive relay 103 can be reached, the accuracy and reliability of the voltage collection unit 1021 collecting the voltage on the outside loop of the main positive relay 103 can be improved, and the convenience of adjusting the voltage on the outside loop of the main positive relay 103 can be improved; and the collection of the voltage by the voltage collection unit 1021 can improve the accuracy and reliability of the collected voltage, and can improve the efficiency of collecting the voltage, which is further conducive to improving the accuracy and efficiency of subsequently determining the virtual voltage detection result according to the first voltage and the second voltage.

[0093] In yet another optional embodiment, the insulation detection circuit 101 includes a first insulation resistor RX1, a second insulation resistor RX2, a first bridge arm matching resistor RQ1, a second bridge arm matching resistor RQ2, a third bridge arm matching resistor RQ3, a fourth bridge arm matching resistor RQ4, a first insulation detection switch S1, a second insulation detection switch S2, and a third insulation detection switch S3, wherein:

[0094] The first end of the first insulation resistor RX1 is electrically connected to the first end of the main positive relay 103, the first end of the first insulation detection switch S1, and a first end for electrically connecting the battery module, the second end of the first insulation resistor RX1 is electrically connected to the first end of the second insulation detection switch S2 and the first end of the second insulation resistor RX2, the second end of the first insulation detection switch S1 is electrically connected to the first end of the first bridge arm matching resistor RQ1, the second end of the first bridge arm matching resistor RQ1 is respectively electrically connected to the first end of the second bridge arm matching resistor RQ2 and the first end of the third insulation detection switch S3, the second end of the second bridge arm matching resistor RQ2 is respectively electrically connected to the second end of the second insulation detection switch S2 and the first end of the third bridge arm matching resistor RQ3, the second end of the third bridge arm matching resistor RQ3 is electrically connected to the first end of the fourth bridge arm matching resistor RQ4, and the second end of the second insulation resistor RX2 is respectively electrically connected to the second end of the fourth bridge arm matching resistor RQ4, the second end of the third insulation detection switch S3, and the second end of the battery module for grounding.

[0095] In the optional embodiment, optionally, the half-bridge topology is adopted in the insulation detection circuit 101, wherein the first bridge arm matching resistor RQ1, the second bridge arm matching resistor RQ2, the third bridge arm matching resistor RQ3, and the fourth bridge arm matching resistor RQ4 are half-bridge bridge arm matching resistors. Further, the first bridge arm matching resistor RQ1, the second bridge arm matching resistor RQ2, the third bridge arm matching resistor RQ3, and the fourth bridge arm matching resistor RQ4 can be used for voltage division of the circuit to change the voltage and / or current in the loop of the insulation detection circuit 101.

[0096] In the optional embodiment, optionally, when the first insulation detection switch S1 and the second insulation detection switch S2 are simultaneously opened, the total voltage in the battery module has no path to the outside of the main positive relay, that is, when the first insulation detection switch S1 and the second insulation detection switch S2 are simultaneously opened, the battery module is disconnected from the main positive relay 103, and at this time, the insulation detection is not performed. Further optionally, when the first insulation detection switch S1 and the second insulation detection switch S2 are simultaneously closed, at this time, the insulation detection is started, the current flows from the outside of the main positive relay 103 to the first bridge arm matching resistor RQ1, the second bridge arm matching resistor RQ2, the second insulation detection switch S2, and then to the outside of the main positive relay 103, and further to the inside of the main negative relay 104. Further, when the first insulation detection switch S1 and the third insulation detection switch S3 are simultaneously closed, the current flows from the outside of the main positive relay 103 to the first bridge arm matching resistor RQ1, the second bridge arm matching resistor RQ2, the third bridge arm matching resistor RQ3, and the fourth bridge arm matching resistor RQ4, and then to the main negative relay 104.

[0097] It can be seen that by implementing the optional embodiment, the first bridge arm matching resistor RQ1, the second bridge arm matching resistor RQ2, the third bridge arm matching resistor RQ3, and the fourth bridge arm matching resistor RQ4 can be used for voltage division of the insulation detection circuit to change the voltage and / or current in the loop of the insulation detection circuit 101. Further, by controlling the closing or opening of the first insulation detection switch S1, the second insulation detection switch S2, and the third insulation detection switch S3 to control whether the insulation detection is performed, the intelligence and convenience of controlling the insulation detection circuit 101 can be improved. Based on the three insulation detection switches, the first voltage on the outside of the main positive relay 103 and the second voltage on the inside of the main negative relay 104 can be detected through different current loop paths, the intelligence of detecting the first voltage and the second voltage can be improved, thereby facilitating to improve the accuracy and reliability of detecting the first voltage and the second voltage, and further facilitating to improve the accuracy and intelligence of determining the virtual voltage detection result based on the first voltage and the second voltage.

[0098] In yet another optional embodiment, the voltage acquisition circuit 102 further comprises: a third insulation resistor 1024 and a fourth insulation resistor 1025, wherein:

[0099] The first end of the third insulation resistor 1024 is electrically connected to the first end of the first voltage dividing resistor 1022, the second end of the third insulation resistor 1024 is electrically connected to the first end of the fourth insulation resistor 1025, and the second end of the fourth insulation resistor 1025 is electrically connected to the second end of the second voltage dividing resistor 1023.

[0100] In this optional embodiment, optionally, the third insulation resistor 1024 and the fourth insulation resistor 1025 are the whole vehicle insulation resistors. Further optionally, the third insulation resistor 1024 and the fourth insulation resistor 1025 can be one or more of a metal film resistor, a carbon film resistor, a wire-wound resistor, a cement resistor, a photosensitive resistor, a thermistor, a variable resistor, etc., and the embodiments of the present application are not limited specifically. Further, the insulation resistor is the most basic insulation index of electrical equipment and electrical circuits, which can measure the safety performance of electrical equipment and reflect the insulation state of electrical equipment.

[0101] In this optional embodiment, optionally, for example, when the first insulation detection switch S1 and the second insulation detection switch S2 are both in a closed state and the second insulation resistor RX2 = 10M, if the third insulation resistor 1024, the fourth insulation resistor 1025, the second bridge arm matching resistor RQ2, the third bridge arm matching resistor RQ3 and the fourth bridge arm matching resistor RQ4 are connected in series and parallel, and the equivalent resistance value Rcb of the series and parallel connection is 1.108M, the total voltage U of the battery module is 352V, the resistance values of the first bridge arm matching resistor RQ1 and the second bridge arm matching resistor RQ2 are 0.6 ohms, and the equivalent resistance value of the series connection of the third insulation resistor 1024 and the fourth insulation resistor 1025 is 12.565 ohms, the first voltage V1 is calculated as V1 = U * Rcb / (R1 + R2 + Rcb) = 352 * 1.108 / (1.108 + 1.2) = 168.98V; and then the second voltage V2 is calculated as V2 = 168.98 * 10 / 12.565 = 134.4V, at this time the voltage value of V2 is calculated as 134.4V, and the voltage value of V2 is determined as the virtual voltage detection result; further, the voltage value of V2 is determined as the virtual voltage detection value.

[0102] It can be seen that by implementing this optional embodiment, the third insulation resistor 1024 and the fourth insulation resistor 1025 can be used to insulate the circuit, the circuit and the battery module can be in an insulation state, and the accuracy and reliability of subsequent insulation detection of the circuit can be improved, thereby facilitating improvement of the accuracy of virtual voltage detection of the circuit, and further facilitating improvement of the accuracy of determination of the virtual voltage detection result.

[0103] In yet another optional embodiment, the virtual pressure processing circuit 106 further comprises a triode Q1M, a first capacitor C1, a first resistor 1062 and a second resistor 1063, wherein:

[0104] A third end of the optocoupler 1061 is electrically connected to a first end of the first resistor 1062 and a first end of the second resistor 1063 respectively, a second end of the first resistor 1062 is used for electrically connecting an input power supply, a fourth end of the optocoupler 1061 is electrically connected to a second end of the second resistor 1063 and a collector of the triode Q1M respectively, an emitter of the triode Q1M is electrically connected to a first end of the first capacitor C1 and used for grounding, and a base of the triode Q1M is electrically connected to a second end of the first capacitor C1 and a fourth end of the control module 105 respectively;

[0105] The control module 105 is an MCU chip.

[0106] In this optional embodiment, optionally, the control module 105 sends the generated virtual pressure control signal to the triode Q1M, which can perform amplification operation on the virtual pressure control signal, and after performing filtering operation on the virtual pressure control signal by the first capacitor C1, transmits the virtual pressure control signal to the optocoupler 1061, which can ensure the stability of the virtual pressure control signal transmission and the stability of the circuit operation; and through the first resistor 1062 and the second resistor 1063, the current in the circuit loop is reduced and the voltage is reduced, which can ensure that the current and voltage in the circuit meet the safety conditions, so as to avoid the phenomenon that the optocoupler 1061 is damaged due to excessive current or voltage.

[0107] In this optional embodiment, optionally, the MCU (Microcontroller Unit; MCU) chip is a micro control unit, also known as a single chip microcomputer or a single chip microcomputer, which is a central processing unit (Central Process Unit; CPU) with appropriate frequency and specifications, and integrates memory, counters (Timer), USB, A / D conversion, UART, PLC, DMA and other peripheral interfaces, even LCD drive circuit on a single chip to form a chip-level computer for different application scenarios.

[0108] As can be seen, implementing this optional embodiment can amplify the virtual voltage control signal through transistor Q1M and filter the virtual voltage control signal through the first capacitor C1, which can suppress noise in the virtual voltage control signal, improve the signal-to-noise ratio of the virtual voltage control signal, help suppress oscillations in the virtual voltage control signal, and thus suppress interference in the virtual voltage control signal to improve the reliability of the virtual voltage control signal, thereby also helping to improve the stability of the virtual voltage control signal during transmission; and, by using the first resistor 1062 and the second resistor 1063 to reduce the current and voltage in the circuit loop, it can ensure that the current and voltage in the circuit meet the safety conditions, so as to avoid damage to the optocoupler 1061 due to excessive current or voltage, which helps to improve the safety and stability of circuit operation, and thus helps to improve the stability and accuracy of virtual voltage detection.

[0109] Example 2

[0110] Please see Figure 7 , Figure 7 This is a flowchart illustrating a method for detecting false voltage in battery insulation according to an embodiment of the present invention. The method can be applied to a false voltage detection circuit for battery insulation, which includes an insulation detection circuit, a voltage acquisition circuit, a main positive relay, a main negative relay, and a control module. Figure 7 As shown, the method for detecting the false voltage of battery insulation may include the following operations:

[0111] 701. The insulation detection circuit performs an insulation detection operation on the battery module to ensure that the battery module is in an insulated state.

[0112] 702. When the battery module is in an insulated state, the voltage acquisition circuit acquires the first voltage of the main positive relay and the second voltage of the main negative relay, and transmits the first voltage and the second voltage to the control module.

[0113] 703. The control module determines the false voltage detection result based on the first voltage and the second voltage.

[0114] It is evident that implementation Figure 7The described battery insulation virtual pressure detection method can insulate the battery module by the insulation detection circuit 101 to make the battery module in an insulation state, and when the battery module is in the insulation state, the first voltage of the main positive relay and the second voltage of the main negative relay are collected by the voltage collection circuit, the first voltage and the second voltage are transmitted to the control module, and the control module determines the virtual pressure detection result according to the first voltage and the second voltage. The presence of virtual pressure in the circuit and the cause of the virtual pressure in the circuit can be determined according to the collected outer voltage of the main positive relay and the inner voltage of the main negative relay. Compared with the prior art, when insulation detection is implemented, the voltage between the positive end and the negative end of the high-voltage connector is usually detected to detect virtual pressure, which has the problem of low accuracy of virtual pressure detection. The application can determine the virtual pressure detection result by detecting the first voltage outside the main positive relay and the second voltage inside the main negative relay, improve the accuracy of voltage collection of the main positive relay and the main negative relay, and further improve the accuracy of determining the virtual pressure detection result based on the first voltage of the main positive relay and the second voltage of the main negative relay. The accuracy and efficiency of virtual pressure detection can be improved. Further, the control module can analyze the first voltage and the second voltage to determine the virtual pressure detection result, which can further improve the accuracy of virtual pressure detection and improve the safety and stability of the battery system.

[0115] In an optional embodiment, the virtual pressure detection circuit further comprises a virtual pressure processing circuit;

[0116] And the method further comprises:

[0117] The control module generates a virtual pressure processing control signal according to the virtual pressure detection result, and transmits the virtual pressure processing control signal to the virtual pressure processing circuit to trigger the virtual pressure processing circuit to perform a virtual pressure processing operation matched with the virtual pressure processing signal according to the virtual pressure processing signal.

[0118] It can be seen that by implementing the optional embodiment, the control module can generate a virtual voltage processing control signal according to the virtual voltage detection result, and transmit the virtual voltage processing control signal to the virtual voltage processing circuit. The virtual voltage processing circuit can perform a virtual voltage processing operation matched with the virtual voltage processing control signal according to the virtual voltage processing control signal. The control module and the virtual voltage processing circuit can solve the virtual voltage problem existing in the circuit. Compared with the prior art which can only detect whether a virtual voltage problem exists in the circuit, the application can not only determine the virtual voltage detection result by detecting the first voltage outside the main positive relay and the second voltage inside the main negative relay, but also improve the accuracy and efficiency of determining the virtual voltage detection result. In addition, the control module in the application can generate a corresponding virtual voltage processing control signal and transmit the virtual voltage processing control signal to the virtual voltage processing circuit to trigger the virtual voltage processing circuit to perform a matched virtual voltage processing operation according to the virtual voltage processing control signal. The circuit between the main positive relay outside the loop and the main negative relay inside the loop can be disconnected to eliminate the virtual voltage problem existing in the circuit. The virtual voltage problem existing in the circuit can be effectively solved, thereby improving the safety and stability of the battery system operation.

[0119] In another optional embodiment, the virtual voltage detection circuit further comprises a precharge circuit.

[0120] In addition, the method further comprises:

[0121] When the power supply is turned on, the current flows through the precharge circuit to the main positive relay to avoid the instantaneous high current flowing through the main positive relay when the power supply is turned on, which damages the main positive relay.

[0122] It can be seen that by implementing the optional embodiment, the precharge circuit included in the virtual voltage detection circuit can be connected in parallel with the main positive relay, which can protect the main positive relay to avoid the instantaneous high current flowing through the main positive relay when the power supply is turned on, which damages the main positive relay. Compared with the prior art, if there is no precharge circuit in the circuit, the instantaneous current flowing through the main positive relay is too large, which easily causes the contact of the main positive relay to be ablated, thereby damaging the main positive relay and other circuit devices. By connecting the precharge circuit in parallel with the main positive relay, the application can effectively prevent the phenomenon that the current flowing into the main positive relay is too large, which damages the main positive relay. The operation of the circuit device can be effectively protected, which improves the safety and stability of the circuit operation, thereby improving the safety and stability of the battery system operation.

[0123] It should be noted that other descriptions of the insulation detection circuit, the voltage acquisition circuit, the main positive relay, the main negative relay and the control module are described in the description of the relevant content in Embodiment One, which will not be described here.

[0124] Embodiment Three

[0125] The electronic device disclosed by the embodiment of the application, Figure 8 A structural diagram of an electronic device is disclosed, the electronic device is a battery insulation virtual pressure detection device, and the electronic device comprises the battery insulation virtual pressure detection circuit 10 of the embodiment one. It should be noted that the detailed description of the battery insulation virtual pressure detection circuit 10 is described in the embodiment one, and the embodiment will not be described again.

[0126] It can be seen that the embodiment Figure 8 The electronic device described performs an insulation detection operation on the battery module through the insulation detection circuit 10 to make the battery module in an insulation state, when the battery module is in the insulation state, the insulation detection operation is performed on the battery module through the insulation detection circuit to make the battery module in the insulation state, when the battery module is in the insulation state, the first voltage of the main positive relay and the second voltage of the main negative relay are collected through the voltage collection circuit, and the first voltage and the second voltage are transmitted to the control module, and the virtual pressure detection result is determined through the control module according to the first voltage and the second voltage. It can be seen that the embodiment of the application can detect the virtual pressure problem of the battery through the first voltage and the second voltage, can improve the accuracy and efficiency of the virtual pressure detection, can further solve the virtual pressure problem when the battery has the virtual pressure problem, and thus is conducive to improving the safety and stability of the battery system operation.

[0127] Finally, it should be noted that: the battery insulation virtual pressure detection circuit, the detection method and the electronic device disclosed by the embodiment of the application are only the preferred embodiment of the application, and are only used to illustrate the technical solutions of the application, but not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that; the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced; and these modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the application.

Claims

1. A voltage detection circuit for battery insulation, characterized in that, The false voltage detection circuit includes an insulation detection circuit, a voltage acquisition circuit, a main positive relay, a main negative relay, and a control module. The control module is an MCU chip, wherein: The first terminal of the insulation detection circuit is electrically connected to the first terminal of the main positive relay and is also used to electrically connect to the first terminal of the battery module. The second terminal of the main positive relay is electrically connected to the first terminal of the voltage acquisition circuit. The second terminal of the voltage acquisition circuit is electrically connected to the main negative relay. The third terminal of the voltage acquisition circuit is electrically connected to the first terminal of the control module. The second terminal of the insulation detection circuit is also used to electrically connect to the second terminal of the battery module and is also used to ground. The insulation detection circuit is used to perform an insulation detection operation on the battery module so that the battery module is in an insulating state. The voltage acquisition circuit is used to acquire the first voltage of the main positive relay and the second voltage of the main negative relay when the battery module is in the insulation state, and transmit the first voltage and the second voltage to the control module. The control module is used to determine the false voltage detection result based on the first voltage and the second voltage.

2. The battery insulation false voltage detection circuit according to claim 1, characterized in that, The false pressure detection circuit further includes a false pressure processing circuit, wherein: The first terminal of the false voltage processing circuit is electrically connected to the fourth terminal of the voltage acquisition circuit, and the second terminal of the false voltage processing circuit is electrically connected to the second terminal of the control module. The control module is also used to generate a false pressure processing control signal based on the false pressure detection result, and transmit the false pressure processing control signal to the false pressure processing circuit; The virtual pressure processing circuit can be used to perform virtual pressure processing operations that match the virtual pressure processing control signal according to the virtual pressure processing control signal.

3. The battery insulation false voltage detection circuit according to claim 2, characterized in that, The false pressure detection circuit also includes a pre-charging circuit, wherein: The first end of the pre-charging circuit is electrically connected to the third end of the main positive relay, and the second end of the pre-charging circuit is electrically connected to the fourth end of the main positive relay. The pre-charging circuit is used to protect the main positive relay to prevent damage to the main positive relay caused by a sudden high current flowing through it when the power is turned on.

4. The battery insulation false voltage detection circuit according to claim 2, characterized in that, The virtual pressure processing circuit includes: an optocoupler, wherein: The first end of the optocoupler is electrically connected to the fourth end of the voltage acquisition circuit, the second end of the optocoupler is electrically connected to the fifth end of the voltage acquisition circuit, and the third end of the optocoupler is electrically connected to the fourth end of the control module. The optocoupler is used to perform a conduction operation or a cutoff operation that matches the virtual voltage processing control signal, according to the virtual voltage processing control signal.

5. The battery insulation false voltage detection circuit according to claim 3, characterized in that, The pre-charging circuit includes a pre-charging resistor and a pre-charging relay, wherein: The first end of the pre-charge resistor is electrically connected to the third end of the main positive relay, the second end of the pre-charge resistor is electrically connected to the first end of the pre-charge relay, and the second end of the pre-charge relay is electrically connected to the fourth end of the main positive relay.

6. The battery insulation false voltage detection circuit according to claim 4, characterized in that, The voltage acquisition circuit includes a first voltage divider resistor, a second voltage divider resistor, and a voltage acquisition unit, wherein: The first end of the first voltage divider resistor is electrically connected to the second end of the main positive relay and the first end of the voltage acquisition unit, respectively. The second end of the first voltage divider resistor is electrically connected to the first end of the second voltage divider resistor. The second end of the second voltage divider resistor is electrically connected to the second end of the voltage acquisition unit and the main negative relay, respectively. The third end of the voltage acquisition unit is electrically connected to the first end of the control module. The fourth end of the voltage acquisition unit is electrically connected to the first end of the optocoupler device. The fifth end of the voltage acquisition unit is electrically connected to the second end of the optocoupler device.

7. The battery insulation false voltage detection circuit according to any one of claims 1-5, characterized in that, The insulation detection circuit includes a first insulation resistor, a second insulation resistor, a first bridge arm matching resistor, a second bridge arm matching resistor, a third bridge arm matching resistor, a fourth bridge arm matching resistor, a first insulation detection switch, a second insulation detection switch, and a third insulation detection switch, wherein: The first end of the first insulation resistor is electrically connected to the first end of the main positive relay, the first end of the first insulation detection switch, and the first end for electrically connecting the battery module. The second end of the first insulation resistor is electrically connected to the first end of the second insulation detection switch and the first end of the second insulation resistor. The second end of the first insulation detection switch is electrically connected to the first end of the first bridge arm matching resistor. The second end of the first bridge arm matching resistor is electrically connected to the first end of the second bridge arm matching resistor and the first end of the third insulation detection switch. The second end of the second bridge arm matching resistor is electrically connected to the second end of the second insulation detection switch and the first end of the third bridge arm matching resistor. The second end of the third bridge arm matching resistor is electrically connected to the first end of the fourth bridge arm matching resistor. The second end of the second insulation resistor is electrically connected to the second end of the fourth bridge arm matching resistor, the second end of the third insulation detection switch, and the second end of the battery module, and is used for grounding.

8. The battery insulation false voltage detection circuit according to claim 6, characterized in that, The voltage acquisition circuit further includes: a third insulation resistor and a fourth insulation resistor, wherein: The first end of the third insulating resistor is electrically connected to the first end of the first voltage divider resistor, the second end of the third insulating resistor is electrically connected to the first end of the fourth insulating resistor, and the second end of the fourth insulating resistor is electrically connected to the second end of the second voltage divider resistor.

9. The battery insulation false voltage detection circuit according to claim 6, characterized in that, The virtual voltage processing circuit further includes a transistor, a first capacitor, a first resistor, and a second resistor, wherein: The third terminal of the optocoupler is electrically connected to the first terminal of the first resistor and the first terminal of the second resistor, respectively. The second terminal of the first resistor is used to electrically connect to the input power supply. The fourth terminal of the optocoupler is electrically connected to the second terminal of the second resistor and the collector of the transistor, respectively. The emitter of the transistor is electrically connected to the first terminal of the first capacitor and is used for grounding. The base of the transistor is electrically connected to the second terminal of the first capacitor and the fourth terminal of the control module, respectively.

10. A method for detecting false voltage in battery insulation, characterized in that, The false voltage detection method is applied to a false voltage detection circuit for battery insulation. The false voltage detection circuit includes an insulation detection circuit, a voltage acquisition circuit, a main positive relay, a main negative relay, and a control module. The control module is an MCU chip. The first terminal of the insulation detection circuit is electrically connected to the first terminal of the main positive relay and is also used to electrically connect to the first terminal of the battery module. The second terminal of the main positive relay is electrically connected to the first terminal of the voltage acquisition circuit. The second terminal of the voltage acquisition circuit is electrically connected to the main negative relay. The third terminal of the voltage acquisition circuit is electrically connected to the first terminal of the control module. The second terminal of the insulation detection circuit is used to electrically connect to the second terminal of the battery module and is also used for grounding. The method includes: The insulation detection circuit performs an insulation detection operation on the battery module to ensure that the battery module is in an insulating state. When the battery module is in the insulation state, the voltage acquisition circuit acquires the first voltage of the main positive relay and the second voltage of the main negative relay, and transmits the first voltage and the second voltage to the control module. The control module determines the false voltage detection result based on the first voltage and the second voltage.

11. The method for detecting false voltage in battery insulation according to claim 10, characterized in that, The false pressure detection circuit also includes a false pressure processing circuit; Furthermore, the method further includes: The control module generates a false pressure processing control signal based on the false pressure detection result, and transmits the false pressure processing control signal to the false pressure processing circuit to trigger the false pressure processing circuit to perform a false pressure processing operation that matches the false pressure processing control signal.

12. The method for detecting false voltage in battery insulation according to claim 11, characterized in that, The false pressure detection circuit also includes a pre-charging circuit; Furthermore, the method further includes: When the power is turned on, the current flows through the pre-charging circuit to the main positive relay to avoid damage to the main positive relay caused by a sudden high current flowing through it when the power is turned on.

13. An electronic device, characterized in that, The electronic device includes a battery insulation false voltage detection circuit as described in any one of claims 1-9.

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