A vehicle power-on method, system and product

Abstract

The present application discloses a vehicle power-on method, system and product, the method comprising: upon receiving a power-on request from a target vehicle, powering on the target vehicle at a low voltage; upon a condition that the insulation of the target vehicle was normal when it was powered off last time, powering on the target vehicle at a high voltage within a first time period; upon a time point when the target vehicle was powered off last time being before the power-on request; upon a condition that the insulation of the target vehicle was abnormal when it was powered off last time, performing insulation detection on the target vehicle within a second time period; and powering on the target vehicle at a high voltage after detecting that the insulation of the target vehicle is normal; wherein the first time period is shorter than the second time period.

Description

Technical Field

[0001] The present application relates to the field of battery production technology, and in particular to a vehicle power-on method, system, and product. Background Art

[0002] With the rapid development of the new energy vehicle industry and the annual increase in sales of new energy vehicles, people are paying more and more attention to the safety issues of new energy vehicles, especially the insulation performance of new energy vehicles.

[0003] When new energy vehicles start driving, they are usually powered on at low voltage first and then transition to high voltage. In order to avoid affecting the driving experience, the vehicle is generally required to switch to high voltage within a certain period of time after being powered on at low voltage. However, due to the hardware limitations of the vehicle, one insulation detection cycle is about 10 seconds, resulting in insufficient time to detect the reliability of the vehicle's insulation before switching on high voltage. Safety can only be ensured by detecting insulation problems after switching on high voltage and then switching off high voltage. Therefore, the safety of the vehicle is poor during the period from switching on high voltage until the insulation fault is reported. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of this application is to provide a vehicle power-on method, system and product.

[0005] This application is implemented through the following technical solutions.

[0006] A first aspect of the present application provides a vehicle power-on method, the method comprising: upon receiving a power-on request from a target vehicle, powering on the target vehicle at a low voltage; if the insulation of the target vehicle was normal when it was powered off last, powering on the target vehicle at a high voltage within a first time period; the time point when the target vehicle was powered off last was before the power-on request; if the insulation of the target vehicle was abnormal when it was powered off last, performing insulation detection on the target vehicle within a second time period; and powering on the target vehicle at a high voltage after detecting that the insulation of the target vehicle is normal; wherein the first time period is smaller than the second time period.

[0007] Based on this, the technical solution proposed in the present application will trigger the rapid insulation detection during the low-voltage power-on only if the insulation of the vehicle was abnormal when it was powered off during the previous driving cycle, thereby ensuring that there is no problem with the insulation detection of the vehicle before the high voltage is turned on this time; at the same time, if the insulation of the vehicle was normal when it was powered off during the previous driving cycle, then the vehicle can be directly powered on at high voltage, which will not affect the high-voltage time of the entire vehicle. In other words, the judgment of whether to perform insulation detection on the vehicle this time is based on the insulation condition of the vehicle driving before the power-on request, and is not judged during the current driving, thereby reducing the judgment time for triggering the insulation detection, and then being able to enter the insulation detection faster, thereby improving the driver's car experience while ensuring safety.

[0008] In some embodiments of the present application, the method also includes: determining a set of historical vehicle insulation resistance values ​​of the target vehicle during the recorded driving process when the target vehicle was powered off in the previous driving cycle; if there are no consecutive preset number of historical vehicle insulation resistance values ​​less than the preset insulation resistance threshold in the set of historical vehicle insulation resistance values, it is determined that the insulation of the target vehicle was normal when it was powered off the previous time; if there are consecutive preset number of historical vehicle insulation resistance values ​​less than the preset insulation resistance threshold in the set of historical vehicle insulation resistance values, it is determined that the insulation of the target vehicle was abnormal when it was powered off the previous time.

[0009] Based on this, the present application determines whether a rapid insulation test is required on the target vehicle this time according to the previous driving conditions of the target vehicle. The result determined by this judgment method is more accurate, and insulation problems can be discovered in time when they occur in the target vehicle, thereby improving the safety of the vehicle.

[0010] In some embodiments of the present application, the insulation test on the target vehicle includes: connecting the battery pack of the target vehicle to an insulation test circuit to determine the battery pack insulation resistance of the battery pack; simultaneously connecting the body of the target vehicle to the insulation test circuit to determine the whole vehicle insulation resistance of the body; determining the battery pack insulation test result of the target vehicle based on the battery pack insulation resistance; and determining the whole vehicle insulation test result of the target vehicle based on the whole vehicle insulation resistance; and determining the insulation test result of the target vehicle according to the battery pack insulation test result and the whole vehicle insulation test result.

[0011] Based on this, the present application performs rapid insulation testing on the target vehicle by separately testing the battery pack and the vehicle body, which can improve the comprehensiveness of the insulation testing, make the obtained test results more accurate, and thus improve the safety of the vehicle.

[0012] In some embodiments of the present application, the battery pack insulation resistance includes a positive resistance of the battery pack to ground and a negative resistance of the battery pack to ground; determining the battery pack insulation resistance of the battery pack includes: connecting a first resistance branch in parallel to a first detection branch where the battery pack is located; setting at least one first resistor on the first resistance branch; collecting the first positive voltage to ground and the first negative voltage to ground of the battery pack when it is detected that the voltage across the battery pack is in a stable state; at the same time, connecting a second resistance branch in parallel to the first detection branch; setting at least one second resistor on the second resistance branch; collecting the second positive voltage to ground and the second negative voltage to ground of the battery pack again when it is detected that the voltage across the battery pack is in a stable state; determining the positive resistance of the battery pack to ground and the negative resistance of the battery pack to ground according to the first positive voltage to ground, the first negative voltage to ground, and at least one first resistance corresponding to the at least one first resistor, and the second positive voltage to ground, the second negative voltage to ground, and at least one second resistance corresponding to the at least one second resistor.

[0013] Based on this, the present application performs insulation testing on the battery pack by calculating the positive resistance of the battery pack to ground and the negative resistance of the battery pack to ground, and then makes a judgment based on the positive resistance to ground and the negative resistance of the battery pack to ground. This method can make the judgment result more accurate, thereby improving the safety of the vehicle.

[0014] In some embodiments of the present application, the battery pack insulation test result of the target vehicle is determined based on the battery pack insulation resistance; including: if the positive resistance of the battery pack to ground and the negative resistance of the battery pack to ground are both greater than a preset insulation resistance threshold, then the battery pack insulation test result of the target vehicle is determined to be that the battery pack insulation test has passed; if the positive resistance of the battery pack to ground and the negative resistance of the battery pack to ground are not both greater than the preset insulation resistance threshold, then the battery pack insulation test result of the target vehicle is determined to be that the battery pack insulation test has failed.

[0015] Based on this, when judging the insulation test results of the battery pack, the present application compares the positive resistance to ground and the negative resistance to ground of the battery pack with the preset insulation resistance threshold value respectively. Only when the positive resistance to ground and the negative resistance to ground of the battery pack are both greater than the preset insulation resistance threshold value, can it be determined that the battery pack insulation test of the target vehicle has passed. This method can further ensure the comprehensiveness of the battery pack insulation test, thereby ensuring the safety of high voltage on the vehicle.

[0016] In some embodiments of the present application, the insulation resistance of the whole vehicle is the parallel resistance of the positive resistance of the vehicle body to the ground and the negative resistance of the vehicle body to the ground; determining the insulation resistance of the whole vehicle of the vehicle body includes: connecting the second detection branch where the vehicle body is located to the first detection branch when the first resistance branch and the second resistance branch are connected in parallel to the first detection branch; when it is detected that the voltage across the battery pack is in a stable state, continuing to collect the third positive voltage to the ground and the third negative voltage to the ground of the battery pack; determining the parallel resistance of the vehicle body according to the third positive voltage to the ground, the third negative voltage to the ground, the positive resistance of the battery pack and the negative resistance of the battery pack.

[0017] Based on this, when performing insulation detection on the vehicle body, the present application uses the parallel resistance of the positive resistance of the vehicle body to the ground and the negative resistance of the vehicle body to the ground, and then makes a judgment based on the parallel resistance. This method can ensure the accuracy of the judgment result while improving the speed of judgment, thereby improving the safety of the vehicle.

[0018] In some embodiments of the present application, the whole vehicle insulation test result of the target vehicle is determined based on the whole vehicle insulation resistance; including: if the parallel resistance is greater than a preset parallel insulation resistance threshold, then the whole vehicle insulation test result of the target vehicle is determined to be a whole vehicle insulation test pass; if the parallel resistance is not greater than the preset parallel insulation resistance threshold, then the whole vehicle insulation test result of the target vehicle is determined to be a whole vehicle insulation test fail.

[0019] Based on this, when judging the insulation test result of the vehicle body, the present application compares the parallel resistance with the preset parallel insulation resistance threshold, and then obtains the insulation test result of the whole vehicle. Compared with the method of calculating the positive resistance of the vehicle body to the ground and the negative resistance of the vehicle body to the ground and then comparing them, the method proposed in the present application can ensure the accuracy of the judgment result while improving the judgment speed, thereby improving the safety of the vehicle.

[0020] In some embodiments of the present application, the insulation test result of the target vehicle is determined based on the battery pack insulation test result and the whole vehicle insulation test result, including: if the battery pack insulation test result is that the battery pack insulation test passed, and the whole vehicle insulation test result is that the whole vehicle insulation test passed, then the insulation test result of the target vehicle is determined to be that the insulation of the target vehicle is normal; if the battery pack insulation test result is that the battery pack insulation test failed, and / or the whole vehicle insulation test result is that the whole vehicle insulation test failed, then the insulation test result of the target vehicle is determined to be that the insulation of the target vehicle is abnormal.

[0021] Based on this, the technical solution proposed in this application needs to perform insulation tests on the battery pack and body of the target vehicle at the same time when performing rapid insulation testing on the target vehicle, and only when the insulation tests of both pass can it be determined that the target vehicle has passed this rapid insulation test. This method can further ensure the comprehensiveness of the insulation test, thereby ensuring the safety of high voltage on the vehicle.

[0022] A second aspect of the present application provides a battery management system, the system comprising: a battery control unit, for, upon receiving a power-on request from a target vehicle, performing low-voltage power-on on the target vehicle; in a first time period, if the insulation of the target vehicle was normal when it was powered off for the last time, performing high-voltage power-on on the target vehicle; the last time the target vehicle was powered off was before the power-on request; in a second time period, if the insulation of the target vehicle was abnormal when it was powered off for the last time; and performing high-voltage power-on on the target vehicle after detecting that the insulation of the target vehicle is normal; wherein the first time period is less than the second time period.

[0023] A third aspect of the present application provides a computer program product, including a computer program or instructions, characterized in that when the computer program or instructions are executed by a processor, the steps in any of the above-mentioned vehicle power-on methods are implemented.

[0024] The technical solution proposed in the present application will trigger the rapid insulation detection during the low-voltage power-on only if there is an insulation problem when the vehicle is powered off during the previous driving cycle, thereby ensuring that there is no problem with the insulation detection of the vehicle before the high voltage is turned on. At the same time, if there is no insulation problem when the vehicle is powered off during the previous driving cycle, the vehicle can be directly powered on, which will not affect the high-voltage time of the entire vehicle. In other words, the judgment of whether to perform insulation detection on the vehicle this time is based on the insulation condition of the vehicle driving before the power-on request, and is not judged during the current driving. This can reduce the judgment time for triggering the insulation detection, and then can enter the insulation detection faster, thereby improving the driver's car experience while ensuring safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0026] Figure 1 A schematic diagram of a process flow of a vehicle power-on method provided in an embodiment of the present application;

[0027] Figure 2 A schematic diagram of an exemplary process for determining the insulation resistance of a battery pack provided in an embodiment of the present application;

[0028] Figure 3 An exemplary equivalent circuit provided in the embodiment of the present application Figure 1 ;

[0029] Figure 4 An exemplary equivalent circuit provided in the embodiment of the present application Figure 2 ;

[0030] Figure 5 A schematic diagram of an exemplary process for determining the insulation resistance of a vehicle provided in an embodiment of the present application;

[0031] Figure 6 An exemplary equivalent circuit provided in the embodiment of the present application Figure 3 ;

[0032] Figure 7 A schematic diagram of the composition of a battery management system provided in an embodiment of the present application.

[0033] Description of Reference Numerals

[0034] A1-first equivalent resistor; A2-second equivalent resistor; A3-third equivalent resistor; A4-fourth equivalent resistor; 30-first detection branch; 31-first resistance branch; 310-first sub-resistance; 311-second sub-resistance; 312-third sub-resistance; 313-fourth sub-resistance; 314-first switch; 315-second switch; 32-second resistance branch; 320-fifth sub-resistance; 321-sixth sub-resistance; 322-third switch; 323-fourth switch; 33-fifth switch; 34-second detection branch; 7-battery management system; 70-battery control unit. DETAILED DESCRIPTION

[0035] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions.

[0037] In the description of the embodiments of the present application, the technical terms "first", "second", "third", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0038] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0039] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0040] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0041] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0042] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0043] Below, this application is described in detail.

[0044] Battery cells are an important part of batteries. New energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also being increasingly used in the field of energy storage.

[0045] At present, new energy batteries are increasingly used in life and industry. New energy batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric vehicles, and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding. In the embodiment of the present disclosure, the battery can be a battery cell. A battery cell refers to a basic unit that can realize the mutual conversion of chemical energy and electrical energy, which can be used to make a battery module or a battery pack, so as to supply power to an electrical device. The battery cell can be a secondary battery, which refers to a battery cell that can be used to activate the active material by charging after the battery cell is discharged. The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc., and the embodiment of the present disclosure is not limited to this.

[0046] New energy batteries are often used in new energy vehicles. Compared with traditional vehicles, new energy vehicles have a whole set of high-voltage components. The higher operating voltage puts higher requirements on the insulation performance between the high-voltage system and the vehicle chassis. When the insulation performance of the vehicle is reduced due to various actual working conditions or hardware aging, it may cause the potential of the chassis to rise, affecting the operation of the vehicle equipment and even affecting the safety of personnel. Therefore, the insulation condition of the vehicle is very important.

[0047] Based on the above problems, the present application proposes a vehicle power-on method, which is applied to a battery management system, the battery management system at least including a battery control unit; the specific method includes the following steps S101 to S103:

[0048] Step S101: upon receiving a power-on request from a target vehicle, power on the target vehicle at a low voltage.

[0049] The vehicle power-on method proposed in the present application is suitable for a scenario in which the vehicle is powered on from low voltage to high voltage at the beginning of vehicle driving.

[0050] In an embodiment of the present application, upon receiving a power-on request from the target vehicle, the battery control unit performs low-voltage power-on on the target vehicle.

[0051] It should be noted that in the embodiment of the present application, the battery control unit needs to determine the insulation condition of the target vehicle when it was powered off for the last time, and then determine whether it is necessary to perform an insulation test on the target vehicle before powering on the target vehicle at high voltage based on the insulation condition of the target vehicle.

[0052] Step S102: If the insulation of the target vehicle was normal when it was powered off last time, power on the target vehicle with high voltage within a first time period; the time point when the target vehicle was powered off last time was before the power-on request.

[0053] In an embodiment of the present application, when the insulation of the target vehicle was normal when it was powered off for the last time, the battery control unit powers on the target vehicle with high voltage within a first time period; the time point when the target vehicle was powered off for the last time was before the power-on request.

[0054] It can be understood that the technical solution proposed in the present application determines whether it is necessary to perform an insulation test on the target vehicle after the target vehicle is powered on at low voltage, based on the insulation condition of the target vehicle when it was powered off for the last time. If the insulation of the target vehicle was normal when it was powered off for the last time, high voltage is directly applied to the target vehicle, which can ensure the safety of the vehicle without affecting the time when the vehicle is powered on at high voltage, thereby ensuring the driving experience of the vehicle.

[0055] Step S103, in the case where the insulation of the target vehicle was abnormal when it was powered off last time, insulation detection is performed on the target vehicle within a second time period; and after detecting that the insulation of the target vehicle is normal, the target vehicle is powered on with high voltage; wherein the first time period is shorter than the second time period.

[0056] In an embodiment of the present application, when the insulation of the target vehicle is abnormal when it is powered off for the last time, the battery control unit performs insulation detection on the target vehicle within a second time period; and after detecting that the insulation of the target vehicle is normal, the target vehicle is powered on with high voltage; wherein the first time period is smaller than the second time period.

[0057] It should be noted that, in the embodiment of the present application, the time required for insulation detection (the second time period) is greater than the time for directly applying high voltage (the first time period). Therefore, when the insulation of the target vehicle was normal the previous time, high voltage can be applied faster than when insulation abnormality requires insulation detection. The specific first time period and the second time period can be determined based on actual conditions, and the embodiment of the present application does not make any specific limitations here.

[0058] It can be understood that the technical solution proposed in the present application will trigger the rapid insulation detection during the current low-voltage power-on only if there is an insulation problem when the vehicle was powered off during the previous driving cycle, thereby ensuring that there is no problem with the insulation detection of the vehicle before the high voltage is turned on. At the same time, if there is no insulation problem when the vehicle was powered off during the previous driving cycle, the vehicle can be directly powered on, which will not affect the high-voltage time of the entire vehicle. In other words, the judgment of whether to perform insulation detection on the vehicle this time is based on the insulation condition of the vehicle driving before the power-on request, and is not judged during the current driving, thereby reducing the judgment time for triggering the insulation detection, and then being able to enter the insulation detection faster, thereby improving the driver's car experience while ensuring safety.

[0059] In an optional embodiment of the present application, the battery control unit determines whether the insulation of the target vehicle is abnormal or normal when it is powered off in the previous driving cycle, including: determining a set of historical vehicle insulation resistance values ​​of the target vehicle during the driving process recorded when the target vehicle was powered off in the previous driving cycle; if there are no consecutive preset number of historical vehicle insulation resistance values ​​less than the preset insulation resistance threshold in a set of historical vehicle insulation resistance values, then it is determined that the insulation of the target vehicle was normal when it was powered off in the previous driving cycle; if there are consecutive preset number of historical vehicle insulation resistance values ​​less than the preset insulation resistance threshold in a set of historical vehicle insulation resistance values, then it is determined that the insulation of the target vehicle was abnormal when it was powered off in the previous driving cycle.

[0060] It should be noted that in the embodiment of the present application, the target vehicle will periodically detect its own vehicle insulation during driving, that is, it will collect its own vehicle insulation resistance at regular intervals, and record the collected vehicle insulation resistance in sequence. Usually, if the vehicle insulation resistance collected for three consecutive cycles is less than the preset insulation resistance threshold, the target vehicle will immediately report a fault and execute the corresponding emergency plan. At the same time, a set of vehicle insulation resistance values ​​recorded during the current driving process of the target vehicle will also include these three vehicle insulation resistance values ​​that are less than the preset insulation resistance threshold. Therefore, when driving the target vehicle next time, it can be determined whether the insulation of the target vehicle is normal or abnormal when it is powered off in the previous driving cycle by checking whether a set of historical vehicle insulation resistance values ​​recorded when the power is turned off in the previous driving cycle includes a preset number of historical vehicle insulation resistance values ​​that are continuously less than the preset insulation resistance threshold. The specific preset number can be determined based on actual conditions, and the embodiment of the present application does not make specific restrictions here.

[0061] It should be noted that in order to regulate the development of new energy vehicles, the country has issued safety standards for the insulation resistance of new energy vehicles, that is, under the maximum working voltage, the insulation resistance of the DC circuit should not be less than 100Ω / V, and the insulation resistance of the AC circuit should not be less than 500Ω / V. Therefore, the preset insulation resistance threshold can be determined based on whether the AC circuit or DC circuit is actually used. Whether to set it to 100Ω / V or 500Ω / V; the specific preset insulation resistance threshold can be set according to actual conditions and is not limited to the examples given above.

[0062] It should be noted that in the embodiment of the present application, the target vehicle includes a battery management system (BMS), and the BMS has an insulation diagnosis function. Therefore, the BMS is usually used to monitor the insulation state of the high-voltage system of the target vehicle in real time, that is, to monitor the insulation resistance of the entire target vehicle.

[0063] It should be noted that in the embodiment of the present application, the insulation resistance of the whole vehicle refers to the resistance of the high-voltage system in the target vehicle to the body of the target vehicle, which represents the insulation performance of the high-voltage components in the target vehicle. Usually, high-voltage components are insulated from the body during production design, but due to the complex use environment of the vehicle, there are factors such as high temperature, high humidity, corrosion, vibration, and bumps, which cause the insulation performance of high-voltage components to decline or even fail, resulting in the body being charged. In order to avoid the above risks, it is necessary to monitor the insulation resistance changes of the high-voltage system in the target vehicle in real time, that is, to detect the insulation resistance of the whole vehicle.

[0064] In an optional embodiment of the present application, the battery control unit performs an insulation test on the target vehicle, including: connecting the battery pack of the target vehicle to the insulation test circuit to determine the battery pack insulation resistance of the battery pack; simultaneously connecting the body of the target vehicle to the insulation test circuit to determine the whole vehicle insulation resistance of the body; determining the battery pack insulation test result of the target vehicle based on the battery pack insulation resistance; and determining the whole vehicle insulation test result of the target vehicle based on the whole vehicle insulation resistance; and determining the insulation test result of the target vehicle based on the battery pack insulation test result and the whole vehicle insulation test result.

[0065] It should be noted that in the embodiment of the present application, when the battery control unit performs a rapid insulation test on the target vehicle, it is necessary to connect the battery pack and the body of the target vehicle to the insulation detection circuit, and determine the battery pack insulation resistance of the battery pack and the vehicle insulation resistance of the body through a specific insulation detection method, wherein the specific insulation detection method can be an AC injection method or a bridge method or a method that can realize insulation detection; the specific insulation detection method can be selected according to actual conditions, and the embodiment of the present application does not make specific limitations here.

[0066] It should be noted that in the embodiment of the present application, after the host determines that a rapid insulation test is required for the target vehicle, it is necessary to first disconnect the high-voltage circuits of the entire vehicle except the insulation detection circuit to completely isolate the vehicle environment from the battery management unit (BMU). Since the insulation detection circuit also uses high voltage electricity for detection, this method can avoid connecting the entire vehicle to high voltage electricity when performing a rapid insulation test on the target vehicle, causing vehicle failure.

[0067] In an optional embodiment of the present application, the insulation resistance of the battery pack includes the positive resistance of the battery pack to ground and the negative resistance of the battery pack to ground; Figure 2 As shown, the insulation detection device determines the battery pack insulation resistance of the battery pack, specifically including the following steps S201 to S205:

[0068] Step S201, connecting a first resistance branch in parallel to a first detection branch where the battery pack is located; and setting at least one first resistor on the first resistance branch.

[0069] It should be noted that in the embodiments of the present application, an exemplary equivalent circuit diagram is provided, such as Figure 3 As shown, the insulation resistance of the battery pack of the target vehicle during the insulation detection is equivalent to the first equivalent resistor A1 and the second equivalent resistor A2, wherein the first equivalent resistor A1 is equivalent to the positive resistance of the battery pack to ground, and the second equivalent resistor A2 is equivalent to the negative resistance of the battery pack to ground. It can be seen that the first detection branch 30 including the first equivalent resistor A1 and the second equivalent resistor A2 is connected in parallel with the first resistance branch 31, and at least one first resistor is set on the first resistance branch 31. Figure 3 For example, at least one first resistor includes a first sub-resistor 310, a second sub-resistor 311, a third sub-resistor 312 and a fourth sub-resistor 313. After the insulation detection device closes the first switch 314 and the second switch 315, the first resistance branch 31 is connected in parallel with the first detection branch 30. At this time, at least one first resistor arranged on the first resistance branch 31 is connected in parallel with the first equivalent resistor A1 and the second equivalent resistor A2.

[0070] It should be noted that, in the embodiment of the present application, the first switch 314 and the second switch 315 can be metal-oxide semiconductor (MOS) tubes, such as P-type metal oxide semiconductor (Positive channel Metal Oxide Semiconductor, PMOS) or N-type metal oxide semiconductor (Negative channel Metal Oxide Semiconductor, NMOS), or electronic devices with the function of switching on or off branches; the specific switches and the number of switches on the first resistance branch 31 can be determined according to actual conditions, and the embodiment of the present application does not make specific limitations here.

[0071] It should be noted that in the embodiment of the present application, the number of the at least one first resistor set on the first resistor branch 31 can be one or more, and it is only necessary to know the resistance value of the first resistor; the specific number of the at least one first resistor can be determined according to actual conditions, and the embodiment of the present application does not make any specific limitations here.

[0072] Step S202: When it is detected that the voltage across the battery pack is in a stable state, a first positive voltage to ground and a first negative voltage to ground of the battery pack are collected.

[0073] It should be noted that in the embodiments of the present application, Figure 3 For example, after connecting the first detection branch 30 in parallel with the first resistance branch 31, wait for the voltage across the first equivalent resistor A1 and the second equivalent resistor A2 to stabilize, and then collect the voltage across the first equivalent resistor A1 and the second equivalent resistor A2. Since the first equivalent resistor A1 is equivalent to the positive resistance of the battery pack to ground, the voltage across the first equivalent resistor A1 is equivalent to the first positive voltage to ground of the battery pack. Correspondingly, since the second equivalent resistor A2 is equivalent to the negative resistance to ground of the battery pack, the voltage across the second equivalent resistor A2 is equivalent to the first negative voltage to ground of the battery pack.

[0074] Step S203, simultaneously connecting a second resistance branch in parallel to the first detection branch; and providing at least one second resistor on the second resistance branch.

[0075] It should be noted that in the embodiments of the present application, another exemplary equivalent circuit diagram is provided, such as Figure 4 As shown, after the first detection branch 30 is connected in parallel with the first resistance branch 31 and the first resistance branch 31 is connected, the second resistance branch 32 is also connected in parallel with the first detection branch 30, and at least one second resistor is provided on the second resistance branch 32. Figure 4For example, at least one second resistor includes a fifth sub-resistor 320 and a sixth sub-resistor 321. If the insulation detection device closes the third switch 322 or the fourth switch 323, the fifth sub-resistor 320 or the sixth sub-resistor 321 is connected in parallel with the first detection branch 30 and the first resistance branch 31; that is, after the second resistance branch 32 is connected in parallel with the first detection branch 30, only one of the third switch 322 or the fourth switch 323 can be selectively closed to connect only the fifth sub-resistor 320 or the sixth sub-resistor 321 in parallel to the first detection branch 30 and the first resistance branch 31, instead of connecting the fifth sub-resistor 320 and the sixth sub-resistor 321 in parallel to the first detection branch 30 and the first resistance branch 31 at the same time.

[0076] It should be noted that in the embodiment of the present application, the third switch 322 and the fourth switch 323 can also be MOS tubes, such as PMOS or NMOS, or electronic devices with the function of switching on or off the branch; the specific switches and the number of switches on the second resistance branch 32 can be determined according to actual conditions, and the embodiment of the present application does not make specific limitations here.

[0077] It should be noted that in the embodiment of the present application, the number of the at least one second resistor set on the second resistor branch 32 can be one or more, and it is only necessary to know the resistance value of the second resistor; the specific number of the at least one second resistor can be determined according to actual conditions, and the embodiment of the present application does not make any specific limitations here.

[0078] Step S204: When it is detected that the voltages at both ends of the battery pack are in a stable state, a second positive voltage to ground and a second negative voltage to ground of the battery pack are collected again.

[0079] It should be noted that in the embodiments of the present application, Figure 4 For example, after the first detection branch 30 is simultaneously connected in parallel with the first resistance branch 31 and the second resistance branch 32, the voltages across the first equivalent resistor A1 and the second equivalent resistor A2 are collected again after waiting for the voltages across the first equivalent resistor A1 and the second equivalent resistor A2 to stabilize. Since the first equivalent resistor A1 is equivalent to the positive resistance to ground of the battery pack, the voltage across the first equivalent resistor A1 collected again is equivalent to the second positive voltage to ground of the battery pack. Correspondingly, since the second equivalent resistor A2 is equivalent to the negative resistance to ground of the battery pack, the voltage across the second equivalent resistor A2 collected again is equivalent to the second negative voltage to ground of the battery pack.

[0080] Step S205, determining the positive resistance value of the battery pack to ground and the negative resistance value of the battery pack to ground according to the first positive voltage to ground, the first negative voltage to ground, and at least one first resistance value corresponding to at least one first resistor, and the second positive voltage to ground, the second negative voltage to ground, and at least one second resistance value corresponding to at least one second resistor.

[0081] It should be noted that in the embodiment of the present application, when determining the positive resistance of the battery pack to ground and the negative resistance of the battery pack to ground, a first equation can be established based on the first positive voltage to ground, the first negative voltage to ground, at least one first resistance, the positive resistance of the battery pack to ground, and the negative resistance of the battery pack to ground, and a second equation can be established based on the second positive voltage to ground, the second negative voltage to ground, at least one first resistance, at least one second resistance, the positive resistance of the battery pack to ground, and the negative resistance of the battery pack to ground. Finally, the first equation and the second equation are solved as a system of equations to obtain the positive resistance of the battery pack to ground and the negative resistance of the battery pack to ground. The specific method for calculating the positive resistance of the battery pack to ground and the negative resistance of the battery pack to ground can be selected according to actual conditions, and the embodiment of the present application does not make specific limitations here.

[0082] In an optional embodiment of the present application, the insulation detection device determines the battery pack insulation detection result of the target vehicle based on the battery pack insulation resistance; including: if the positive resistance of the battery pack to ground and the negative resistance of the battery pack to ground are both greater than the preset insulation resistance threshold, then the battery pack insulation detection result of the target vehicle is determined to be the battery pack insulation test passed; if the positive resistance of the battery pack to ground and the negative resistance of the battery pack to ground are not both greater than the preset insulation resistance threshold, then the battery pack insulation detection result of the target vehicle is determined to be the battery pack insulation test failed.

[0083] It should be noted that in the embodiment of the present application, when judging the insulation resistance of the battery pack, it is necessary to judge the positive resistance of the battery pack to the ground and the negative resistance of the battery pack to the ground respectively. Only when the positive resistance of the battery pack to the ground and the negative resistance of the battery pack to the ground are both greater than the preset insulation resistance threshold, can it be determined that the battery pack insulation test of the target vehicle has passed; on the contrary, if one of the positive resistance of the battery pack to the ground and the negative resistance of the battery pack to the ground is not greater than the preset insulation resistance threshold, the battery pack insulation test of the target vehicle has failed.

[0084] In an optional embodiment of the present application, the insulation resistance of the whole vehicle is the parallel resistance of the positive resistance of the vehicle body to the ground and the negative resistance of the vehicle body to the ground; Figure 5 As shown, the insulation detection device determines the insulation resistance of the vehicle body, specifically including the following steps S501 to S503:

[0085] Step S501: When a first resistance branch and a second resistance branch are connected in parallel to a first detection branch, a second detection branch where a vehicle body is located is connected to the first detection branch.

[0086] It should be noted that in the embodiments of the present application, another exemplary equivalent circuit diagram is provided, such as Figure 6 As shown, the third equivalent resistor A3 and the fourth equivalent resistor A4 are used to equivalently measure the insulation resistance of the entire vehicle during the insulation detection of the target vehicle, wherein the third equivalent resistor A3 is equivalent to the positive resistance of the vehicle body to the ground, and the fourth equivalent resistor A4 is equivalent to the negative resistance of the vehicle body to the ground. It can be seen that when the fifth switch 33 is closed, the second detection branch 34 including the third equivalent resistor A3 and the fourth equivalent resistor A4 is connected to the first detection branch 30. At this time, it can be regarded as the third equivalent resistor A3 and the fourth equivalent resistor A4 are connected in parallel to the first detection branch 30.

[0087] It should be noted that, in the embodiment of the present application, the fifth switch 33 may also be a MOS tube, such as PMOS or NMOS, or a relay, or an electronic device with the function of switching on or off a branch circuit; the fifth switch 33 may be determined according to actual conditions, and the embodiment of the present application does not make any specific limitation here.

[0088] Step S502: When it is detected that the voltages at both ends of the battery pack are in a stable state, continue to collect a third positive voltage to ground and a third negative voltage to ground of the battery pack.

[0089] It should be noted that in the embodiments of the present application, Figure 6 For example, after connecting the second detection branch 34 where the vehicle body is located to the first detection branch 30, wait for the voltage across the first equivalent resistor A1 and the second equivalent resistor A2 to stabilize, and then continue to collect the voltage across the first equivalent resistor A1 and the second equivalent resistor A2. At this time, it can be regarded as the third equivalent resistor A3 and the fourth equivalent resistor A4 being connected in parallel to the first detection branch 30, and the parallel resistance of the third equivalent resistor A3 and the fourth equivalent resistor A4 after being connected in parallel can be calculated based on the voltage across the first equivalent resistor A1 and the second equivalent resistor A2.

[0090] Step S503, determining the parallel resistance of the vehicle body according to the third positive voltage to ground, the third negative voltage to ground, the positive resistance of the battery pack to ground, and the negative resistance of the battery pack to ground.

[0091] It should be noted that in the embodiment of the present application, since the positive resistance of the battery pack to ground and the negative resistance of the battery pack to ground have been obtained in the above embodiment, after collecting the voltages across the first equivalent resistor A1 and the second equivalent resistor A2, the parallel resistance of the third equivalent resistor A3 and the fourth equivalent resistor A4 can be calculated based on the third positive voltage to ground, the third negative voltage to ground, and the calculated positive resistance of the battery pack to ground and the negative resistance of the battery pack to ground; the specific calculation method can be selected according to the actual situation, and the embodiment of the present application does not make any specific limitations here.

[0092] In an optional embodiment of the present application, a whole vehicle insulation test result of the target vehicle is determined based on the whole vehicle insulation resistance; including: if the parallel resistance is greater than a preset parallel insulation resistance threshold, then the whole vehicle insulation test result of the target vehicle is determined to be the whole vehicle insulation test passed; if the parallel resistance is not greater than the preset parallel insulation resistance threshold, then the whole vehicle insulation test result of the target vehicle is determined to be the whole vehicle insulation test failed.

[0093] It should be noted that in the embodiment of the present application, when judging the insulation resistance of the whole vehicle, since what is calculated is the parallel resistance of the positive resistance of the vehicle body to the ground and the negative resistance of the vehicle body to the ground, a preset parallel insulation resistance threshold can be set in advance, and then the insulation condition of the whole vehicle can be judged according to the size between the parallel resistance and the preset parallel insulation resistance threshold, that is, if the parallel resistance is greater than the preset parallel insulation resistance threshold, the whole vehicle insulation test of the target vehicle passes; if the parallel resistance is not greater than the preset parallel insulation resistance threshold, the whole vehicle insulation test of the target vehicle fails.

[0094] In an optional embodiment of the present application, the insulation detection device determines a quick insulation detection result of the target vehicle based on a battery pack insulation detection result and a whole vehicle insulation detection result, including: if the battery pack insulation detection result is that the battery pack insulation detection passed, and the whole vehicle insulation detection result is that the whole vehicle insulation detection passed, then the insulation detection result of the target vehicle is determined to be that the insulation of the target vehicle is normal; if the battery pack insulation detection result is that the battery pack insulation detection failed, and / or the whole vehicle insulation detection result is that the whole vehicle insulation detection failed, then the insulation detection result of the target vehicle is determined to be that the insulation of the target vehicle is abnormal.

[0095] It should be noted that in the embodiment of the present application, after performing a quick insulation test on the battery pack and the vehicle body, if the insulation tests of the battery pack and the vehicle body are both passed, it can be determined that the insulation test result of the target vehicle is normal; similarly, if one of the insulation tests in the battery pack or the vehicle body fails, it can be determined that the insulation test result of the target vehicle is abnormal.

[0096] It can be understood that the technical solution proposed in the present application needs to perform insulation tests on the battery pack and the body of the target vehicle at the same time when performing rapid insulation tests on the target vehicle, and only when the insulation tests of both are passed can it be determined that the rapid insulation test of the target vehicle has passed. This method can further ensure the comprehensiveness of the insulation test, thereby ensuring the safety of high voltage on the vehicle.

[0097] The embodiment of the present application provides a vehicle power-on method, the method comprising: upon receiving a power-on request from a target vehicle, powering on the target vehicle at a low voltage; upon a condition that the insulation of the target vehicle was normal when it was powered off last time, powering on the target vehicle at a high voltage within a first time period; upon a time point when the target vehicle was powered off last time being before the power-on request; upon a condition that the insulation of the target vehicle was abnormal when it was powered off last time, performing insulation detection on the target vehicle within a second time period; and upon detecting that the insulation of the target vehicle was normal, powering on the target vehicle at a high voltage; wherein the first time period is shorter than the second time period; adopting the above implementation scheme, the present application is only applicable to the target vehicle when the target vehicle is powered off last time. In the case of insulation abnormalities during power-off in a driving cycle, the rapid insulation test will be triggered only when the low voltage is powered on this time, thereby ensuring that there is no problem with the insulation test of the vehicle before the high voltage is turned on this time; at the same time, if the insulation of the vehicle is normal during power-off in the previous driving cycle, the vehicle can be directly turned on at high voltage, which will not affect the high voltage time of the entire vehicle. In other words, the judgment of whether to perform insulation test on the vehicle this time is based on the insulation condition of the vehicle driving before the power-on request, not the judgment during the current driving, thereby reducing the judgment time for triggering the insulation test, and then being able to enter the insulation test faster, thereby improving the driver's car experience while ensuring safety.

[0098] Based on the above embodiment, in another embodiment of the present application, a battery management system is provided. Figure 7 A schematic diagram of the structure of a battery management system provided in this application is shown in FIG. Figure 7 As shown, the battery management system 7 includes:

[0099] The battery control unit 70 is used to, upon receiving a power-on request from the target vehicle, power on the target vehicle at a low voltage; if the insulation of the target vehicle was normal when it was powered off for the last time, power on the target vehicle at a high voltage within a first time period; the time point when the target vehicle was powered off for the last time was before the power-on request; if the insulation of the target vehicle was abnormal when it was powered off for the last time, perform insulation detection on the target vehicle within a second time period; and power on the target vehicle at a high voltage after detecting that the insulation of the target vehicle is normal; wherein the first time period is smaller than the second time period.

[0100] It should be noted that in the embodiment of the present application, the battery control unit 70 determines the vehicle insulation condition of the target vehicle when it was powered off in the previous driving cycle while powering on the target vehicle at low voltage, and then determines whether it is necessary to perform a quick insulation test on the target vehicle before powering on the target vehicle at high voltage after this low-voltage power-on based on the vehicle insulation condition of the target vehicle; specifically, if the battery control unit 70 determines that there was no insulation problem when the target vehicle was powered off in the previous driving cycle, it powers on the target vehicle at high voltage within a first time period; if the battery control unit 70 determines that there was an insulation problem when the target vehicle was powered off in the previous driving cycle, it performs a quick insulation test on the target vehicle within a second time period, and powers on the target vehicle at high voltage after the quick insulation test of the target vehicle passes.

[0101] The embodiment of the present application provides a battery management system, the system comprising: a battery control unit, for, upon receiving a power-on request from a target vehicle, performing low-voltage power-on on the target vehicle; in the case where the insulation of the target vehicle was normal when it was powered off last time, performing high-voltage power-on on the target vehicle within a first time period; the time point when the target vehicle was powered off last time was before the power-on request; in the case where the insulation of the target vehicle was abnormal when it was powered off last time, performing insulation detection on the target vehicle within a second time period; and performing high-voltage power-on on the target vehicle after detecting that the insulation of the target vehicle is normal; wherein the first time period is shorter than the second time period; adopting the above implementation scheme, the present application is only applicable to the target vehicle when the insulation of the target vehicle is normal when the insulation of the target vehicle is powered off last time. In the case that there is an insulation problem when the power is turned off during the last driving cycle, the quick insulation test will be triggered only when the low voltage is turned on this time, so as to ensure that there is no problem with the insulation test of the vehicle before the high voltage is turned on this time; at the same time, if there is no insulation problem when the vehicle is powered off during the previous driving cycle, the vehicle can be directly turned on at high voltage, which will not affect the high voltage time of the whole vehicle. In other words, the judgment of whether to perform insulation test on the vehicle this time is based on the insulation condition of the vehicle driving before the power-on request, and is not judged during the current driving, thereby reducing the judgment time for triggering the insulation test, and then being able to enter the insulation test faster, thereby improving the driver's car experience under the premise of ensuring safety.

[0102] An embodiment of the present application also provides a computer-readable storage medium having a computer program stored thereon. The computer-readable storage medium stores one or more programs, which can be executed by one or more processors and applied to a battery management system. The computer program implements the vehicle power-on method as described above.

[0103] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the application documents.

Claims

1. A method for powering on a vehicle, characterized in that: The method comprises: When receiving a power-on request from a target vehicle, powering on the target vehicle at a low voltage; In the case that the insulation of the target vehicle was normal when it was powered off last time, the target vehicle is powered on at high voltage within a first time period; the time point when the target vehicle was powered off last time is before the power-on request; In the case where the insulation of the target vehicle was abnormal when it was powered off last time, performing insulation detection on the target vehicle within a second time period; and after detecting that the insulation of the target vehicle is normal, powering on the target vehicle with high voltage; wherein the first time period is shorter than the second time period; Wherein, after the target vehicle is powered on at a low voltage, the method further includes: Determine a set of historical vehicle insulation resistance values ​​of the target vehicle during a driving process recorded when the target vehicle was powered off during a previous driving cycle; If there are no consecutive preset number of historical vehicle insulation resistance values ​​less than the preset insulation resistance threshold value in the set of historical vehicle insulation resistance values, it is determined that the insulation of the target vehicle was normal when it was powered off last time; If there are a set of historical vehicle insulation resistance values ​​with a continuous preset number of historical vehicle insulation resistance values ​​less than a preset insulation resistance threshold, it is determined that the insulation of the target vehicle was abnormal when it was powered off last time; The performing insulation detection on the target vehicle comprises: Connecting the battery pack of the target vehicle to an insulation detection circuit to determine the battery pack insulation resistance of the battery pack; At the same time, the body of the target vehicle is connected to the insulation detection circuit to determine the insulation resistance value of the vehicle body; Determine a battery pack insulation test result of the target vehicle based on the battery pack insulation resistance value; and determine a whole vehicle insulation test result of the target vehicle based on the whole vehicle insulation resistance value; The insulation test result of the target vehicle is determined according to the battery pack insulation test result and the whole vehicle insulation test result.

2. The method according to claim 1, characterized in that The battery pack insulation resistance includes a positive resistance of the battery pack to ground and a negative resistance of the battery pack to ground; and determining the battery pack insulation resistance of the battery pack includes: A first resistance branch is connected in parallel to the first detection branch where the battery pack is located; at least one first resistor is arranged on the first resistance branch; When it is detected that the voltages at both ends of the battery pack are in a stable state, collecting a first positive voltage to ground and a first negative voltage to ground of the battery pack; At the same time, a second resistance branch is connected in parallel to the first detection branch; at least one second resistor is arranged on the second resistance branch; When it is detected that the voltages at both ends of the battery pack are in a stable state, collecting again a second positive voltage to ground and a second negative voltage to ground of the battery pack; The positive resistance of the battery pack to ground and the negative resistance of the battery pack to ground of the battery pack are determined based on the first positive voltage to ground, the first negative voltage to ground, at least one first resistance corresponding to the at least one first resistor, and the second positive voltage to ground, the second negative voltage to ground, and at least one second resistance corresponding to the at least one second resistor.

3. The method according to claim 2, characterized in that The step of determining the battery pack insulation test result of the target vehicle based on the battery pack insulation resistance value comprises: If the positive resistance of the battery pack to ground and the negative resistance of the battery pack to ground are both greater than the preset insulation resistance threshold, then the battery pack insulation test result of the target vehicle is determined to be a battery pack insulation test pass; If the positive resistance of the battery pack to ground and the negative resistance of the battery pack to ground are not greater than the preset insulation resistance threshold at the same time, it is determined that the battery pack insulation test result of the target vehicle is that the battery pack insulation test fails.

4. The method according to claim 2, characterized in that: The insulation resistance of the whole vehicle is the parallel resistance of the positive resistance of the vehicle body to the ground and the negative resistance of the vehicle body to the ground; and determining the insulation resistance of the whole vehicle of the vehicle body includes: In the case where the first detection branch is connected in parallel with a first resistance branch and a second resistance branch, the second detection branch where the vehicle body is located is connected to the first detection branch; When it is detected that the voltages at both ends of the battery pack are in a stable state, continue to collect a third positive voltage to ground and a third negative voltage to ground of the battery pack; The parallel resistance of the vehicle body is determined according to the third positive voltage to ground, the third negative voltage to ground, the positive resistance of the battery pack to ground, and the negative resistance of the battery pack to ground.

5. The method according to claim 4, characterized in that The step of determining the vehicle insulation test result of the target vehicle based on the vehicle insulation resistance value comprises: If the parallel resistance is greater than the preset parallel insulation resistance threshold, determining that the vehicle insulation test result of the target vehicle is passed; If the parallel resistance is not greater than the preset parallel insulation resistance threshold, it is determined that the whole vehicle insulation test result of the target vehicle is that the whole vehicle insulation test fails.

6. The method according to claim 1, characterized in that The step of determining the insulation test result of the target vehicle according to the insulation test result of the battery pack and the insulation test result of the whole vehicle includes: If the battery pack insulation test result is that the battery pack insulation test has passed, and the whole vehicle insulation test result is that the whole vehicle insulation test has passed, then determining that the insulation test result of the target vehicle is that the insulation of the target vehicle is normal; If the battery pack insulation test result is that the battery pack insulation test fails, and / or the whole vehicle insulation test result is that the whole vehicle insulation test fails, it is determined that the insulation test result of the target vehicle is that the insulation of the target vehicle is abnormal.

7. A battery management system, characterized in that: The system comprises: A battery control unit, configured to, upon receiving a power-on request from a target vehicle, power on the target vehicle at a low voltage; if the insulation of the target vehicle was normal when it was powered off last time, power on the target vehicle at a high voltage within a first time period; the time point when the target vehicle was powered off last time was before the power-on request; if the insulation of the target vehicle was abnormal when it was powered off last time, perform insulation detection on the target vehicle within a second time period; and power on the target vehicle at a high voltage after detecting that the insulation of the target vehicle is normal; wherein the first time period is shorter than the second time period; The battery control unit is further used to determine a set of historical vehicle insulation resistance values ​​of the target vehicle during the driving process recorded when the target vehicle was powered off in the previous driving cycle; if there are no consecutive preset number of historical vehicle insulation resistance values ​​less than the preset insulation resistance threshold value in the set of historical vehicle insulation resistance values, it is determined that the insulation of the target vehicle was normal when it was powered off the previous time; if there are consecutive preset number of historical vehicle insulation resistance values ​​less than the preset insulation resistance threshold value in the set of historical vehicle insulation resistance values, it is determined that the insulation of the target vehicle was abnormal when it was powered off the previous time; The battery control unit is also used to connect the battery pack of the target vehicle to the insulation detection circuit to determine the battery pack insulation resistance of the battery pack; simultaneously connect the body of the target vehicle to the insulation detection circuit to determine the whole vehicle insulation resistance of the body; determine the battery pack insulation detection result of the target vehicle based on the battery pack insulation resistance; and determine the whole vehicle insulation detection result of the target vehicle based on the whole vehicle insulation resistance; determine the insulation detection result of the target vehicle according to the battery pack insulation detection result and the whole vehicle insulation detection result.

8. A battery system, comprising a battery and the battery management system according to claim 7, characterized in that: The battery system is used to implement the steps of any one of claims 1 to 6 in the power-on method applied to the vehicle.

9. A computer program product comprising a computer program or instructions, characterized in that When the computer program or instruction is executed by a processor, the steps in the vehicle power-on method according to any one of claims 1 to 6 are implemented.

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