Method and apparatus for determining total external voltage of relay, and vehicle and storage medium

Abstract

A method and apparatus for determining the total external voltage of a relay, and a vehicle and a storage medium. The method is applied to a BMS comprising relays (104, 105). The BMS comprises a reference source (103) and a plurality of voltage-dividing resistors, wherein the relays (104, 105) are connected to the plurality of voltage-dividing resistors (106, 107, 108, 109) in series, the reference source (103) is used for clamping a voltage of a central contact of the plurality of voltage-dividing resistors (106, 107, 108, 109) to a first voltage value, and voltage-dividing resistors located on two sides of the central contact have equal resistance values. The method comprises: determining a second voltage value of voltage-dividing resistors (106, 107), which are located on a positive electrode side of a central contact, and a third voltage value of voltage-dividing resistors (108, 109), which are located on a negative electrode side of the central contact; and determining the total external voltage value of a relay on the basis of a first voltage value, the second voltage value and the third voltage value.

Description

Relay outside total voltage determination method and device, vehicle and storage medium

[0001] This application claims priority to Chinese Patent Application No. 202410597840.4, filed on May 14, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present disclosure relates to the field of vehicle power management technology, and in particular to a relay outside total voltage determination method and device, vehicle and storage medium. BACKGROUND

[0003] With the rapid development of electrical technology, as a key control element in the battery management system (BMS) of a vehicle, a relay can be used for charging control, discharging control and overcurrent protection of the vehicle, and therefore, the stability and reliability of the relay performance are crucial for the normal operation of the entire circuit system of the vehicle. SUMMARY

[0004] Some embodiments of the present disclosure provide a relay outside total voltage determination method and device, vehicle and storage medium to at least solve the technical problem that the relay outside total voltage cannot be measured when the relay is disconnected in the related art.

[0005] In a first aspect, a relay outside total voltage determination method is provided, applied to a BMS including a relay, the BMS including a reference source and a plurality of voltage dividing resistors; the relay is connected in series with the plurality of voltage dividing resistors; the reference source is configured to clamp a voltage of a center contact of the plurality of voltage dividing resistors at a first voltage value; resistances of voltage dividing resistors located on both sides of the center contact in the plurality of voltage dividing resistors are equal; the method includes: determining a second voltage value of the voltage dividing resistor located on a positive side of the center contact, and a third voltage value of the voltage dividing resistor located on a negative side of the center contact; and determining a relay outside total voltage value based on the first voltage value, the second voltage value and the third voltage value.

[0006] According to the above technical means, the reference source can be connected to the center contact of the plurality of voltage dividing resistors and the power supply of the BMS, so as to clamp the voltage of the center contact of the plurality of voltage dividing resistors at the first voltage value, so that the BMS can connect the plurality of voltage dividing resistors outside the relay to the power supply through the reference source, so that when the relay is in different states, current flows through the plurality of voltage dividing resistors, so as to determine the relay outside total voltage based on the voltage values of the plurality of voltage dividing resistors and the first voltage value, so as to determine the relay outside total voltage value when the relay is in different states, so that the BMS can perform charging logic control of the vehicle based on the relay outside total voltage value.

[0007] And the power supply of the reference source is provided by the BMS, avoiding the reference source from depending on an external power supply, reducing the complexity of the internal structure of the BMS, and the BMS can also monitor the state of the reference source in real time, so as to discover faults in time and take corresponding measures, improving the stability and reliability of the BMS.

[0008] In some embodiments, based on the first voltage value, the second voltage value and the third voltage value, determining the total voltage value outside the relay includes: based on the first voltage value, the second voltage value and the resistance value of the voltage dividing resistor located on the positive side of the center contact, determining the voltage value of the positive electrode outside the relay; based on the first voltage value, the third voltage value and the resistance value of the voltage dividing resistor located on the negative side of the center contact, determining the voltage value of the negative electrode outside the relay; and based on the voltage value of the positive electrode outside the relay and the voltage value of the negative electrode outside the relay, determining the total voltage value outside the relay.

[0009] According to the above technical means, the BMS can determine the voltage value of the positive electrode outside the relay and the voltage value of the negative electrode outside the relay based on the resistance values of the plurality of voltage dividing resistors, thereby determining the total voltage value outside the relay, and the BMS can also share the voltage value on the relay based on the voltage dividing resistors, avoiding the relay from being damaged, ensuring that the relay can operate normally, and improving the stability and reliability of the BMS.

[0010] In some embodiments, the BMS further includes an analog-to-digital converter (ADC) chip; determining the second voltage value of the voltage dividing resistor located on the positive side of the center contact and the third voltage value of the voltage dividing resistor located on the negative side of the center contact includes: acquiring the voltage value of the voltage dividing resistor located on the positive side of the center contact through the ADC chip to obtain the second voltage value, and acquiring the voltage value of the voltage dividing resistor located on the negative side of the center contact to obtain the third voltage value.

[0011] According to the above technical means, the ADC chip can realize high-precision acquisition of the voltage value of the contact, so that the second voltage value and the third voltage value are more accurate, thereby improving the accuracy of the total voltage value outside the relay. And the power supply of the ADC chip is also provided by the BMS, avoiding the ADC chip from depending on an external power supply, reducing the complexity of the internal structure of the BMS, and the BMS can also monitor the state of the ADC chip in real time, so as to discover faults in time and take corresponding measures, improving the stability and reliability of the BMS.

[0012] In some embodiments, the above method further includes: obtaining the current capacity of the reference source conforming to the first voltage value; and based on the current capacity of the reference source, the first voltage value and the power supply voltage value of the BMS, determining the resistance values of the plurality of voltage dividing resistors.

[0013] According to the above technical means, the BMS can determine the resistance values of the plurality of voltage dividing resistors based on the current capacity of the reference source, so that in the process of determining the total voltage value outside the relay, the reference source and the plurality of voltage dividing resistors can normally operate, avoiding the situation that the reference source and / or the voltage dividing resistors fail in the process of determining the total voltage value outside the relay due to the mismatch between the current capacity of the reference source and the resistance values of the plurality of voltage dividing resistors, and improving the stability and reliability of the BMS.

[0014] In some embodiments, before determining the second voltage value of the voltage dividing resistor on the positive side of the center contact and the third voltage value of the voltage dividing resistor on the negative side of the center contact, the method further comprises: determining a first current and a second current of the relay in different states respectively; the first current is the current flowing through the voltage dividing resistor on the positive side of the center contact; the second current is the current flowing through the voltage dividing resistor on the negative side of the center contact; determining the output current value and the absorption current value required to be met by the reference source based on the first current and the second current of the relay in different states; and determining the specification of the reference source based on the output current value and the absorption current value.

[0015] According to the above technical means, before determining the total voltage value outside the relay, the BMS can determine the first current and the second current of the relay in different states in advance, thereby determining the specification of the reference source, so that in the process of determining the total voltage outside the relay, the reference source can normally operate, avoiding the situation that the reference source fails due to not matching the first current and the second current of the relay in different states, and improving the stability and reliability of the BMS.

[0016] In some embodiments, the relay comprises: a first relay and a second relay; the first relay is connected to the positive pole of the power supply of the BMS; the second relay is connected to the negative pole of the power supply of the BMS; the state of the first relay and the second relay comprises one of the following: the first relay is open, and the second relay is closed; the first relay is closed, and the second relay is open; the first relay is open, and the second relay is open; and the first relay is closed, and the second relay is closed.

[0017] According to the above technical means, the BMS can determine the total voltage value outside the relay when the first relay and the second relay are in any state, so that the BMS can perform charging logic control based on the total voltage value outside the relay, improving the flexibility and adaptability of the BMS.

[0018] In a second aspect, a total voltage outside a relay determining apparatus is provided, which is applied to a BMS including a relay, the BMS further including a reference source and a plurality of voltage dividing resistors; the relay is in series with the plurality of voltage dividing resistors; the reference source is configured to clamp a voltage of a center contact of the plurality of voltage dividing resistors at a first voltage value; resistances of voltage dividing resistors on both sides of the center contact in the plurality of voltage dividing resistors are equal; and the total voltage outside the relay determining apparatus includes a determining module.

[0019] The determining module is configured to determine a second voltage value of the voltage dividing resistor on the positive side of the center contact and a third voltage value of the voltage dividing resistor on the negative side of the center contact, and determine a total voltage outside the relay based on the first voltage value, the second voltage value and the third voltage value.

[0020] In some embodiments, the determining module is further configured to determine a voltage value of a positive electrode outside the relay based on the first voltage value, the second voltage value and the resistance of the voltage dividing resistor on the positive side of the center contact, determine a voltage value of a negative electrode outside the relay based on the first voltage value, the third voltage value and the resistance of the voltage dividing resistor on the negative side of the center contact, and determine the total voltage outside the relay based on the voltage value of the positive electrode outside the relay and the voltage value of the negative electrode outside the relay.

[0021] In some embodiments, the BMS further includes an ADC chip; and the determining module is further configured to acquire the voltage value of the voltage dividing resistor on the positive side of the center contact by the ADC chip to obtain the second voltage value, and acquire the voltage value of the voltage dividing resistor on the negative side of the center contact to obtain the third voltage value.

[0022] In some embodiments, the apparatus further includes an obtaining module configured to obtain a current capacity of the reference source conforming to the first voltage value; and the determining module is further configured to determine the resistance of the plurality of voltage dividing resistors based on the current capacity of the reference source, the first voltage value and a power supply voltage value of the BMS.

[0023] In some embodiments, the determining module is further configured to determine a first current and a second current when the relay is in different states respectively; the first current is a current flowing through the voltage dividing resistor on the positive side of the center contact; and the second current is a current flowing through the voltage dividing resistor on the negative side of the center contact; the determining module is further configured to determine an output current value and an absorption current value required by the reference source based on the first current and the second current when the relay is in different states; and the determining module is further configured to determine a specification of the reference source based on the output current value and the absorption current value.

[0024] In some embodiments, the relay comprises: a first relay and a second relay; the first relay is connected with the positive pole of the power supply of the BMS; the second relay is connected with the negative pole of the power supply of the BMS; the state of the first relay and the second relay comprises one of: the first relay is open, the second relay is closed; the first relay is closed, the second relay is open; the first relay is open, the second relay is open; and the first relay is closed, the second relay is closed.

[0025] In a third aspect, a vehicle is provided, comprising: a processor; and a memory for storing processor-executable instructions; the processor is configured to execute the instructions to implement the method of the first aspect and any possible implementation thereof.

[0026] In a fourth aspect, a computer-readable storage medium is provided, which, when instructions in the computer-readable storage medium are executed by a processor of a vehicle, enables the vehicle to perform the method of the first aspect and any possible implementation thereof.

[0027] In a fifth aspect, a computer program product is provided, which comprises computer instructions, when the computer instructions are run on a vehicle, enable the vehicle to perform the method of the first aspect and any possible implementation thereof.

[0028] The above technical solutions of the present disclosure have the following beneficial effects:

[0029] (1) The reference source can be connected to the center contact of the plurality of voltage division resistors and the power supply of the BMS, thereby clamping the voltage of the center contact of the plurality of voltage division resistors at a first voltage value, so that the BMS can connect the plurality of voltage division resistors outside the relay to the power supply through the reference source, so that when the relay is in different states, current flows through the plurality of voltage division resistors, so as to determine the total voltage outside the relay based on the voltage value of the plurality of voltage division resistors and the first voltage value, thereby determining the total voltage outside the relay in different states, so that the BMS can control the charging logic of the vehicle based on the total voltage outside the relay.

[0030] Moreover, the power supply of the reference source is provided by the BMS, avoiding the dependence of the reference source on an external power supply, reducing the complexity of the internal structure of the BMS, and the BMS can also monitor the state of the reference source in real time, so as to discover faults in time and take corresponding measures, thereby improving the stability and reliability of the BMS.

[0031] (2) The BMS can determine the voltage value of the positive pole outside the relay and the voltage value of the negative pole outside the relay based on the resistance value of the plurality of voltage division resistors, thereby determining the total voltage value outside the relay, and the BMS can also share the voltage value on the relay based on the voltage division resistor, thereby avoiding damage to the relay and ensuring that the relay can operate normally, thereby improving the stability and reliability of the BMS.

[0032] (3) The ADC chip can realize high-precision acquisition of the voltage value of the contact, so that the second voltage value and the third voltage value are more accurate, thereby improving the accuracy of the total voltage value outside the relay. Moreover, the power supply of the ADC chip is also provided by the BMS, avoiding the dependence of the ADC chip on an external power supply, reducing the complexity of the internal structure of the BMS, and the BMS can also monitor the state of the ADC chip in real time to discover faults in time and take corresponding measures, thereby improving the stability and reliability of the BMS.

[0033] (4) The BMS can determine the resistance values of the plurality of voltage dividing resistors based on the current capacity of the reference source, so that the reference source and the plurality of voltage dividing resistors can normally operate in the process of determining the total voltage value outside the relay, avoiding the situation that the reference source and / or the voltage dividing resistors fail in the process of determining the total voltage value outside the relay due to the mismatch between the current capacity of the reference source and the resistance values of the plurality of voltage dividing resistors, thereby improving the stability and reliability of the BMS.

[0034] (5) Before determining the total voltage value outside the relay, the BMS can determine the first current and the second current of the relay in different states in advance, so as to determine the specifications of the reference source, so that the reference source can normally operate in the process of determining the total voltage outside the relay, avoiding the situation that the reference source fails due to the mismatch between the first current and the second current of the relay in different states, thereby improving the stability and reliability of the BMS.

[0035] (6) The BMS can determine the total voltage value outside the relay in any state of the first relay and the second relay, so that the BMS can perform charging logic control based on the total voltage value outside the relay, thereby improving the flexibility and adaptability of the BMS.

[0036] It should be noted that the technical effects brought by any one of the embodiments of the second aspect to the fifth aspect can refer to the technical effects brought by the corresponding embodiments in the first aspect, which will not be described here.

[0037] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0038] The accompanying drawings incorporated in the specification and constituting a part of it illustrate embodiments consistent with the present disclosure and serve together with the specification to explain the principles of the present disclosure, and do not constitute an improper limitation on the present disclosure.

[0039] FIG. 1 is a block diagram of a hardware structure of a total voltage determination method outside a relay according to some embodiments;

[0040] FIG. 2 is a flowchart of a relay outside total voltage determination method according to some embodiments;

[0041] FIG. 3 is a flowchart of another relay outside total voltage determination method according to some embodiments;

[0042] FIG. 4 is a flowchart of yet another relay outside total voltage determination method according to some embodiments;

[0043] FIG. 5 is a flowchart of yet another relay outside total voltage determination method according to some embodiments;

[0044] FIG. 6 is a block diagram of a relay outside total voltage determination apparatus according to some embodiments;

[0045] FIG. 7 is a block diagram of a vehicle according to some embodiments. DETAILED DESCRIPTION

[0046] In order to make the ordinary person skilled in the art better understand the technical solutions of the present disclosure, the technical solutions in the embodiments of the present disclosure will be described clearly and completely below in conjunction with the drawings.

[0047] It should be noted that the terms "first", "second", etc. in the specification and claims of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present disclosure described herein can be implemented in an order other than that illustrated or described herein. The implementation described in the following exemplary embodiments does not represent all implementations consistent with the present disclosure. Rather, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0048] With the rapid development of electrical technology, as a key control element in the vehicle BMS, the relay can be used for charging control, discharging control, and overcurrent protection of the vehicle, etc., therefore, the stability and reliability of the relay performance are crucial for the normal operation of the entire circuit system of the vehicle.

[0049] The BMS of the vehicle can perform charging logic control of the vehicle based on the relay outside total voltage value of the vehicle BMS, however, in actual application, the relay state of the BMS can change due to various environmental factors, such as power fluctuation, load change, or environmental factors, etc., and the relay outside total voltage value also changes with the state of the relay.

[0050] A BMS multifunctional integrated high-voltage monitoring system in the related art determines the total voltage outside the battery pack by closing the contactors K1 and K2, closing S5, disconnecting S0, disconnecting S1, disconnecting S2, disconnecting S3, and disconnecting S4. When determining the total voltage outside the battery pack, the method needs to close the contactors K1 and K2, and cannot determine the total voltage outside the battery pack when the contactors K1 and K2 are disconnected or closed in a single end.

[0051] Another circuit and method for detecting insulation resistance and total voltage of an energy storage BMS in the related art determines the total voltage at the back end by closing the relays RY1 / RY3 and RY2 in the high-voltage box, closing the third switch K3 and the fifth switch K5 of the total detection circuit, turning off the first switch K1, the second switch K2, and the fourth switch K4 of the total detection circuit, connecting the back-end total voltage detection circuit, and making D1 and D2 forward conductive. The circuit enters the back-end total voltage detection mode, the back-end voltage is divided by R3-R6 and R9-R12, and the back-end total voltage is determined based on the number relationship of the voltage dividing circuit.

[0052] When determining the back-end total voltage, the method also needs to close the relays in the high-voltage box, and cannot determine the back-end total voltage when the relays RY1 / RY3 and RY2 are disconnected or closed in a single end.

[0053] Another low-cost BMS high-voltage integrated detection circuit and detection method in the related art determines whether the positive contactor has a sticking fault based on a preset first sticking condition by closing S4 and collecting the PACK voltage. It determines whether the negative contactor has a sticking fault based on a preset second sticking condition by disconnecting S4, closing S5, and collecting the PACK voltage.

[0054] The method collects the voltage of PACK- outside the contactor or the voltage of PACK+ outside the contactor to determine whether the contactor has sticking, and cannot determine the total voltage outside the relay. With the continuous development of new energy vehicle technology, some new energy vehicle charging piles in some regions need to measure the total voltage outside the relay when the relay is disconnected.

[0055] Therefore, how to determine the total voltage outside the relay in different states of the relay is a problem to be solved at present.

[0056] To solve the above problems, some embodiments of the present disclosure provide a relay outside total voltage value determination method. The reference source can be connected to the center contact of the plurality of voltage division resistors and the power supply of the BMS, so as to clamp the voltage of the center contact of the plurality of voltage division resistors at a first voltage value, so that the BMS can connect the plurality of voltage division resistors outside the relay to the power supply through the reference source, so that when the relay is in different states, current flows through the plurality of voltage division resistors, so as to determine the relay outside total voltage based on the voltage value of the plurality of voltage division resistors and the first voltage value. The relay outside total voltage value is determined when the relay is in different states, so that the BMS can control the charging logic of the vehicle based on the relay outside total voltage value.

[0057] In addition, the power supply of the reference source is provided by the BMS, which avoids the dependence of the reference source on external power supply, reduces the complexity of the internal structure of the BMS, and the BMS can also monitor the state of the reference source in real time, so as to discover faults in time and take corresponding measures, thereby improving the stability and reliability of the BMS.

[0058] For ease of understanding, the relay outside total voltage value determination method provided by some embodiments of the present disclosure is introduced below with reference to the accompanying drawings.

[0059] FIG. 1 is a block diagram of a hardware structure of a relay outside total voltage determination method according to some embodiments, as shown in FIG. 1, the hardware structure 100 of the relay outside total voltage determination method includes a power supply 101, an ADC chip 102, a reference source 103, a first relay 104, a second relay 105, a first voltage division resistor 106, a second voltage division resistor 107, a third voltage division resistor 108, a fourth voltage division resistor 109, and a direct current pile 110.

[0060] In some embodiments, the power supply 101 is a power supply in a vehicle BMS, used to provide power supply for the ADC chip 102 and the reference source 103. The positive electrode of the power supply 101 is PACK+, and the negative electrode of the power supply 101 is PACK-.

[0061] The ADC chip 102 is connected to the negative electrode of the power supply 101, the middle contact of the first voltage division resistor 106 and the second voltage division resistor 107, and the middle contact of the third voltage division resistor 108 and the fourth voltage division resistor 109, respectively. The ADC chip 102 is used to collect the second voltage value of the voltage division resistor on the positive side of the center contact and the third voltage value of the voltage division resistor on the negative side of the center contact.

[0062] The reference source 103 is used to clamp the voltage of the center contact C point of the plurality of voltage division resistors at a first voltage value, and is connected to the ADC chip 102, the negative electrode of the power supply 101, and the center contact C point of the plurality of voltage division resistors, respectively.

[0063] The first relay 104 and the second relay 105 are a relay for a positive pole of the power supply 101 and a relay for a negative pole of the power supply 101, respectively, and are used to control charging and discharging of the power supply 101.

[0064] The plurality of voltage division resistors includes a first voltage division resistor 106, a second voltage division resistor 107, a third voltage division resistor 108, and a fourth voltage division resistor 109, which are connected in series in sequence and are connected to an external contact point A of the first relay 104 and an external contact point B of the second relay 105, respectively. The direct current pile 110 is used to charge the power supply 101.

[0065] It should be noted that the hardware structure and application scenarios described in some embodiments of the disclosure are used to more clearly illustrate the technical solutions of some embodiments of the disclosure, and do not constitute a limitation on the disclosure. Those skilled in the art can know that, with the evolution of system architecture and the appearance of new business scenarios, the technical solutions provided by some embodiments of the disclosure are also applicable to similar technical problems.

[0066] FIG. 2 is a flowchart of a method for determining a total voltage outside a relay according to some embodiments. As shown in FIG. 2, the method for determining the total voltage outside the relay includes the following steps S201 and S202.

[0067] S201, determining a second voltage value of a voltage division resistor located on a positive pole side of a center contact and a third voltage value of a voltage division resistor located on a negative pole side of the center contact.

[0068] For example, in addition to the relay, the BMS also includes a reference source and a plurality of voltage division resistors, the relay is connected in series with the plurality of voltage division resistors, the reference source is used to clamp a voltage of a center contact of the plurality of voltage division resistors at a first voltage value, and resistances of the voltage division resistors located on both sides of the center contact are equal. It should be noted that the two sides of the center contact are a positive pole side and a negative pole side of the center contact, respectively.

[0069] In some embodiments, the BMS can determine a second voltage value of a voltage division resistor located on a positive pole side of a center contact of a plurality of voltage division resistors and a third voltage value of a voltage division resistor located on a negative pole side of the center contact, so that the BMS can determine a total voltage value outside a relay according to a voltage division principle between the plurality of voltage division resistors, the second voltage value, the third voltage value, and a first voltage value at which the center contact is clamped.

[0070] For example, the BMS can internally build an ADC chip for collecting a voltage value of a certain contact in a circuit, so as to collect a voltage value of a voltage division resistor located on a positive pole side of a center contact through the ADC chip to obtain a second voltage value, and collect a voltage value of a voltage division resistor located on a negative pole side of the center contact to obtain a third voltage value.

[0071] In some embodiments, the ADC chip can also be any ADC chip with differential acquisition function, such as a standalone ADC chip, an integrated chip with ADC acquisition function, etc., which is not limited in the present disclosure.

[0072] For example, the voltage dividing resistors on the positive side of the center contact are the first voltage dividing resistor and the second voltage dividing resistor, and the voltage dividing resistors on the negative side of the center contact are the third voltage dividing resistor and the fourth voltage dividing resistor. The resistance value of the first voltage dividing resistor is equal to the resistance value of the fourth voltage dividing resistor, and the resistance value of the second voltage dividing resistor is equal to the resistance value of the third voltage dividing resistor.

[0073] The BMS can acquire, through the ADC chip, the voltage value of the center contact between the first voltage dividing resistor and the second voltage dividing resistor as the second voltage value, and acquire the voltage value of the center contact between the third voltage dividing resistor and the fourth voltage dividing resistor as the third voltage value.

[0074] The first voltage dividing resistor, the second voltage dividing resistor, the third voltage dividing resistor and the fourth voltage dividing resistor can each include one or more resistors, which can be adjusted by relevant management personnel based on actual needs, as long as the resistance values of the resistors satisfy the conditions that the resistance value of the first voltage dividing resistor is equal to the resistance value of the fourth voltage dividing resistor, and the resistance value of the second voltage dividing resistor is equal to the resistance value of the third voltage dividing resistor, which are not limited in the present disclosure. The first voltage value is set by the relevant management personnel based on the capacity of the reference source and actual conditions, which is not limited in the present disclosure.

[0075] It can be understood that the power supply of the reference source and the ADC chip in the BMS is provided by the BMS, so that at least one of the reference source and the ADC chip does not rely on an external power supply, the complexity of the internal structure of the BMS is reduced, and the BMS can also monitor the state of at least one of the reference source and the ADC chip in real time, so as to discover faults in time and take corresponding measures, thereby improving the stability and reliability of the BMS. For example, the reference source is a reference source with both output current and absorption current capacity, so as to clamp the voltage of the center contact of the plurality of voltage dividing resistors at the first voltage value.

[0076] In addition, the relay of the BMS includes: a first relay and a second relay, the first relay is connected with the positive electrode of the power supply of the BMS, and the second relay is connected with the negative electrode of the power supply of the BMS. The state of the first relay and the second relay includes one of the following: the first relay is open, and the second relay is closed; the first relay is closed, and the second relay is open; the first relay is open, and the second relay is open; and the first relay is closed, and the second relay is closed.

[0077] S202, determining a total voltage value outside the relay based on the first voltage value, the second voltage value and the third voltage value.

[0078] In some embodiments, after determining the second voltage value of the voltage dividing resistor on the positive electrode side of the center contact and the third voltage value of the voltage dividing resistor on the negative electrode side of the center contact, the BMS can determine the total voltage value outside the relay based on the voltage division principle between the plurality of voltage dividing resistors, the first voltage value, the second voltage value, and the third voltage value.

[0079] For example, the BMS can determine the voltage value of the positive electrode outside the relay based on the first voltage value, the second voltage value, the resistance value of the voltage dividing resistor on the positive electrode side of the center contact, and the voltage division relationship of the voltage dividing resistor on the positive electrode side of the center contact, and determine the voltage value of the negative electrode outside the relay based on the first voltage value, the third voltage value, the resistance value of the voltage dividing resistor on the negative electrode side of the center contact, and the voltage division relationship of the voltage dividing resistor on the negative electrode side of the center contact, so that the BMS can determine the total voltage value outside the relay based on the voltage value of the positive electrode outside the relay and the voltage value of the negative electrode outside the relay.

[0080] For example, the BMS can determine the voltage value of the positive electrode outside the relay based on the first voltage value, the second voltage value, the first voltage dividing resistor, and the second voltage dividing resistor, and determine the voltage value of the negative electrode outside the relay based on the first voltage value, the third voltage value, the third voltage dividing resistor, and the fourth voltage dividing resistor, so as to determine the total voltage value outside the relay.

[0081] It can be understood that since the reference source connects the center contact of the plurality of voltage dividing resistors and the negative electrode of the BMS power supply, there will be current flowing through the plurality of voltage dividing resistors regardless of whether the first relay and the second relay are in an open state or a closed state, so that the BMS can determine the total voltage value outside the relay based on the first voltage value, the second voltage value, and the third voltage value regardless of the state of the relay.

[0082] In some embodiments, before determining the second voltage value and the third voltage value and determining the total voltage value outside the relay based on the first voltage value, the second voltage value, and the third voltage value, the BMS can also test the power supply and the relay of the BMS to determine whether the power supply and the relay of the BMS are suitable for the specifications of the reference source in some embodiments of the present disclosure, so that the reference source can operate normally during the determination of the total voltage value outside the relay, thereby avoiding the situation that the reference source fails during the determination of the total voltage value outside the relay, resulting in inaccurate total voltage value outside the relay.

[0083] Therefore, as shown in FIG. 3, before the above step S201, the method for determining the total voltage value outside the relay provided by some embodiments of the present disclosure further includes the following steps S301-S303.

[0084] S301, respectively determine the first current and the second current when the relay is in different states.

[0085] For example, the first current is a current flowing through a voltage dividing resistor located at the positive electrode side of the center contact, and the second current is a current flowing through a voltage dividing resistor located at the negative electrode side of the center contact.

[0086] In some embodiments, the BMS can determine the first current and the second current in each state of the first relay and the second relay, respectively, for different states of the first relay and the second relay, so as to determine the output current value and the absorption current value required to be met by the reference source, thereby determining the reference source specification.

[0087] For example, in the case where the first relay and the second relay are both open, the BMS of the vehicle is in a dormant state, and the total voltage value outside the relay is a direct current pile output voltage value or a residual voltage value. The BMS can determine the first current based on the following expression:

[0088] wherein I ac represents the first current, U ab represents the total voltage value outside the relay tested by the BMS in the case where the first relay and the second relay are both open, U c represents the first voltage value tested by the BMS, R1 represents the resistance value of the first voltage dividing resistor tested by the BMS, and R2 represents the resistance value of the second voltage dividing resistor tested by the BMS.

[0089] The BMS can also determine the second current based on the following expression:

[0090] wherein I cb represents the second current, R3 represents the resistance value of the third voltage dividing resistor tested by the BMS, and R4 represents the resistance value of the fourth voltage dividing resistor tested by the BMS.

[0091] For example, in the case where the first relay is closed and the second relay is open, the BMS of the vehicle is in a state of plugging in a charging gun during vehicle power-on, and the total voltage value outside the relay is also a direct current pile output voltage value or a residual voltage value. The BMS can determine the first current based on the following expression: ac = (V bat -U c ) / (R1 + R2) ;

[0092] wherein I ac represents the first current, V bat represents the voltage value of the BMS power supply, U c represents the first voltage value tested by the BMS, R1 represents the resistance value of the first voltage dividing resistor tested by the BMS, and R2 represents the resistance value of the second voltage dividing resistor tested by the BMS.

[0093] The BMS can also determine the second current based on the following expression: cb = (Uc -(V bat -U ab )) / (R3+R4);

[0094] wherein, I cb represents the first current, U ab represents the total voltage value outside the relay in the case that the first relay is closed and the second relay is opened, R3 represents the resistance value of the third voltage dividing resistor for the BMS to test, and R4 represents the resistance value of the fourth voltage dividing resistor for the BMS to test.

[0095] For example, in the case that the first relay and the second relay are both closed, the BMS of the vehicle is in a charging state, the total voltage value outside the relay is the voltage value of the BMS power supply, and the voltage value of the negative electrode outside the relay is 0V. The BMS can determine the first current based on the following expression: I ac =(V bat -U c ) / (R1+R2);

[0096] wherein, I ac represents the first current, V bat represents the voltage value of the BMS power supply, U c represents the first voltage value for the BMS to test, R1 represents the resistance value of the first voltage dividing resistor for the BMS to test, and R2 represents the resistance value of the second voltage dividing resistor for the BMS to test.

[0097] The BMS can also determine the second current based on the following expression: I cb =U c / (R3+R4);

[0098] wherein, I cb represents the second current, and R3 represents the resistance value of the third voltage dividing resistor for the BMS to test, and R4 represents the resistance value of the fourth voltage dividing resistor for the BMS to test.

[0099] For example, in the case that the first relay is opened and the second relay is closed, the total voltage value outside the relay is also the DC pile output voltage value or the residual voltage value, the total voltage value outside the relay is equal to the voltage value of the positive electrode outside the relay, and the voltage value of the negative electrode outside the relay is 0V. The BMS can determine the first current based on the following expression: I ac =(U ab -U c ) / (R1+R2);

[0100] wherein, I ac represents the first current, U ab represents the total voltage value outside the relay in the case that the first relay is opened and the second relay is closed, and Uc represents a first voltage value at which the BMS is tested, R1 represents a resistance value of a first voltage dividing resistor at which the BMS is tested, and R2 represents a resistance value of a second voltage dividing resistor at which the BMS is tested.

[0101] The BMS can also determine the second current based on the following expression: I cb = U c / (R3+R4).

[0102] wherein I cb represents the second current, R3 represents a resistance value of a third voltage dividing resistor at which the BMS is tested, and R4 represents a resistance value of a fourth voltage dividing resistor at which the BMS is tested.

[0103] S302, based on the first current and the second current when the relays are in different states, determine the output current value and the absorption current value required to be met by the reference source.

[0104] In some embodiments, after the BMS determines the first current and the second current when the relays are in different states, respectively, the BMS can determine the output current value and the absorption current value required to be met by the reference source based on the first current and the second current when the relays are in different states, thereby determining the specifications of the reference source.

[0105] For example, when both the first relay and the second relay are open, I ac = I cb , the reference source can output a current to drive the ADC chip, and the output current value required to be met by the reference source can be greater than the requirement of the ADC chip.

[0106] When the first relay is closed and the second relay is open, the DC pile has an output voltage or a residual voltage, and the reference source needs to absorb the output current or the residual current of the DC pile, and the absorption current value required to be met by the reference source is greater than the difference between I ac and I cb , i.e., I ac -I cb .

[0107] When both the first relay and the second relay are closed, due to the presence of V bat , the excess current needs to be absorbed by the reference source, and therefore, the absorption current value required to be met by the reference source is the absorption current value I, and the absorption current value I is greater than the difference between I ac and I cb , i.e., I ac -I cb .

[0108] In the case that the first relay is open and the second relay is closed, the DC pile has an output voltage or a residual voltage, and the reference source needs to absorb the output current or the residual current of the DC pile. The required absorption current value of the reference source is greater than I ac The difference between I cb and I ac (I cb ).

[0109] Based on the above four cases, the output current value and the absorption current value required by the reference source to meet the above four cases at the same time.

[0110] S303, based on the output current value and the absorption current value, determine the specification of the reference source.

[0111] In some embodiments, after the BMS determines the output current value and the absorption current value required by the reference source, the BMS can also determine the specification of the reference source based on the output current value and the absorption current value.

[0112] For example, the BMS can select the model and specification of the reference source that meets the output current value and the absorption current value based on the output current value and the absorption current value required by the reference source, so that the reference source can operate normally in the process of determining the total voltage value outside the relay.

[0113] In some embodiments, before the BMS determines the total voltage value outside the relay based on the first voltage value, the second voltage value and the third voltage value, the BMS can also determine the resistance value of the plurality of voltage dividing resistors based on the current capacity of the reference source, so that the reference source and the plurality of voltage dividing resistors can operate normally in the process of determining the total voltage value outside the relay.

[0114] Therefore, as shown in FIG. 4, before the above step S202, the relay total voltage value determination method provided by the embodiments of the present disclosure further includes the following steps S401-S402.

[0115] S401, obtain the current capacity of the reference source meeting the first voltage value.

[0116] In some embodiments, after the BMS determines the model and specification of the reference source, the BMS can determine the first voltage value based on the voltage value of the BMS power supply, so as to select the reference source meeting the first voltage value and obtain the current capacity of the reference source.

[0117] S402, based on the current capacity of the reference source, the first voltage value, and the voltage value of the power supply of the BMS, determine the resistance value of the plurality of voltage dividing resistors.

[0118] In some embodiments, after the BMS obtains the current capacity of the reference source, the BMS can determine the resistance value of the plurality of voltage dividing resistors based on the current capacity of the reference source, the first voltage value and the voltage value of the power supply of the BMS.

[0119] For example, based on the reference source current capability, the first voltage value and the voltage value of the BMS power supply, the process of determining the resistance values of the plurality of voltage dividing resistors can refer to the backstepping process of step S301. The resistance values of the plurality of voltage dividing resistors only need to meet the normal operation of the plurality of voltage dividing resistors and the reference source, and will not be described here.

[0120] It can be understood that the BMS determines the resistance values of the plurality of voltage dividing resistors only needs to be determined before determining the total voltage value outside the relay, so as to determine the total voltage value outside the relay based on the resistance values of the plurality of voltage dividing resistors.

[0121] Therefore, the above-mentioned steps S401 and S402 can be executed before step S201, or can be executed after step S201. The steps S401 and S402 only need to be executed after steps S301-S303, and the present disclosure does not limit this.

[0122] In some embodiments, the BMS can also determine the voltage value of the positive electrode outside the relay and the voltage value of the negative electrode outside the relay based on the first voltage value, the second voltage value, the third voltage value and the resistance values of the plurality of voltage dividing resistors, so as to determine the total voltage value outside the relay based on the voltage value of the positive electrode outside the relay and the voltage value of the negative electrode outside the relay.

[0123] Therefore, as shown in FIG. 5, the above-mentioned step S202 can include the following steps S2021-S2023:

[0124] S2021, determining the voltage value of the positive electrode outside the relay based on the first voltage value, the second voltage value and the resistance value of the voltage dividing resistor located on the positive electrode side of the center contact.

[0125] In some embodiments, after the BMS determines the resistance values of the plurality of voltage dividing resistors, the BMS can determine the voltage value of the positive electrode outside the relay based on the first voltage value, the second voltage value and the resistance value of the voltage dividing resistor located on the positive electrode side of the center contact. For example, the voltage dividing resistor located on the positive electrode side of the center contact includes the first voltage dividing resistor and the second voltage dividing resistor.

[0126] For example, in the case that the first relay and the second relay are both disconnected, the BMS can determine the voltage value of the positive electrode outside the relay based on the following expression: V2=(U a -U c )*R2 / (R1+R2);

[0127] Wherein, V2 represents the second voltage value when the first relay and the second relay are both disconnected, U a represents the voltage value of the positive electrode outside the relay when the first relay and the second relay are both disconnected, U crepresents the first voltage value, R1 represents the resistance value of the first voltage dividing resistor, and R2 represents the resistance value of the second voltage dividing resistor.

[0128] For example, in the case where the first relay is closed and the second relay is open, the BMS can determine the voltage value of the positive electrode outside the relay based on the following expression: V2= (U bat -U c )*R2 / (R1+R2).

[0129] V2 represents the second voltage value when the first relay is closed and the second relay is open, U bat represents the voltage value of the BMS power supply, i.e., the voltage value of the positive electrode outside the relay when the first relay is closed and the second relay is open, U c represents the first voltage value, R1 represents the resistance value of the first voltage dividing resistor, and R2 represents the resistance value of the second voltage dividing resistor.

[0130] For example, in the case where the first relay and the second relay are both closed, the BMS can determine the voltage value of the positive electrode outside the relay based on the following expression: V2= (U a -U c )*R2 / (R1+R2).

[0131] V2 represents the second voltage value when the first relay and the second relay are both closed, U a represents the voltage value of the positive electrode outside the relay when the first relay and the second relay are both closed, i.e., the voltage value of the BMS power supply, U c represents the first voltage value, R1 represents the resistance value of the first voltage dividing resistor, and R2 represents the resistance value of the second voltage dividing resistor.

[0132] For example, in the case where the first relay is open and the second relay is closed, the BMS can determine the voltage value of the positive electrode outside the relay based on the following expression:

[0133] V2= (U a -U c )*R2 / (R1+R2).

[0134] V2 represents the second voltage value when the first relay is open and the second relay is closed, U a represents the voltage value of the positive electrode outside the relay when the first relay is open and the second relay is closed, i.e., the total voltage value of the positive electrode outside the relay when the first relay is open and the second relay is closed, U c represents the first voltage value, R1 represents the resistance value of the first voltage dividing resistor, and R2 represents the resistance value of the second voltage dividing resistor.

[0135] S2022, determine the voltage value of the negative electrode outside the relay based on the first voltage value, the third voltage value, and the resistance value of the voltage dividing resistor located at the negative electrode side of the center contact.

[0136] In some embodiments, after the BMS determines the resistance values of the plurality of voltage dividing resistors, the BMS can also determine the voltage value of the negative electrode outside the relay based on the first voltage value, the third voltage value, and the resistance value of the voltage dividing resistor located at the negative electrode side of the center contact. The voltage dividing resistor located at the negative electrode side of the center contact includes a third voltage dividing resistor and a fourth voltage dividing resistor.

[0137] For example, in the case where both the first relay and the second relay are open, the BMS can determine the voltage value of the negative electrode outside the relay based on the following expression: V3 = (U c -U b )*R3 / (R3+R4).

[0138] wherein V3 represents the third voltage value when both the first relay and the second relay are open, U c represents the first voltage value, U b represents the voltage value of the negative electrode outside the relay when both the first relay and the second relay are open, R3 represents the resistance value of the third voltage dividing resistor, and R4 represents the resistance value of the fourth voltage dividing resistor.

[0139] For example, in the case where the first relay is closed and the second relay is open, the BMS can determine the voltage value of the negative electrode outside the relay based on the following expression: V3 = (U c -(V bat -U ab )*R3 / (R3+R4).

[0140] wherein V3 represents the third voltage value when the first relay is closed and the second relay is open, U c represents the first voltage value, V bat represents the voltage value of the BMS power supply, U ab represents the total voltage value outside the relay when the first relay is closed and the second relay is open, V bat -U ab represents the voltage value of the negative electrode outside the relay when the first relay is closed and the second relay is open, R3 represents the resistance value of the third voltage dividing resistor, and R4 represents the resistance value of the fourth voltage dividing resistor.

[0141] For example, in the case where both the first relay and the second relay are closed, the BMS can determine the voltage value of the negative electrode outside the relay based on the following expression: V3 = (U c -U b )*R3 / (R3+R4).

[0142] Where V3 represents the third voltage value when both the first and second relays are closed, U c U represents the first voltage value. b R3 represents the voltage value at the negative terminal of the relay when both the first and second relays are closed, which is 0V. R4 represents the resistance value of the third voltage divider resistor and R3 represents the resistance value of the fourth voltage divider resistor.

[0143] For example, when the first relay is open and the second relay is closed, the BMS can determine the voltage value of the negative terminal on the outside of the relay based on the following expression: V3=(U c -U b )*R3 / (R3+R4);

[0144] Where V3 represents the third voltage value when the first relay is open and the second relay is closed, U c U represents the first voltage value. b R3 represents the voltage value of the negative terminal of the relay when the first relay is open and the second relay is closed, which is 0V. R4 represents the resistance value of the third voltage divider resistor and R3 represents the resistance value of the fourth voltage divider resistor.

[0145] S2023. Determine the total voltage value outside the relay based on the voltage value of the positive terminal outside the relay and the voltage value of the negative terminal outside the relay.

[0146] In some embodiments, after the BMS determines the voltage value of the positive terminal and the voltage value of the negative terminal on the outside of the relay respectively, it can determine the total voltage value on the outside of the relay based on the voltage values ​​of the positive terminal and the negative terminal on the outside of the relay.

[0147] For example, the BMS can analyze the voltage values ​​of the positive and negative terminals of the relay under different conditions, based on U... ab =U a -U b Determine the total voltage value U on the outside of the relay in each state. ab The resistance values ​​of the first and fourth voltage divider resistors are equal, and the resistance values ​​of the second and third voltage divider resistors are equal, i.e., R1 = R4, R2 = R3. Simplifying the expressions for the voltage values ​​at the positive and negative terminals of the relay in each state, we obtain the following expression: U ab = (V2+V3)*(R1+R2) / R2;

[0148] Therefore, the BMS can directly determine the total voltage value outside the relay based on the voltage value of the positive terminal outside the relay, the voltage value of the negative terminal outside the relay, the resistance value of the first voltage divider resistor, and the resistance value of the second voltage divider resistor in the above expression.

[0149] It can be understood that, as can be known from step S2023, the expression for determining the total voltage value outside the relay is consistent when the first relay and the second relay are in different states, and therefore, in the actual application process of the method for determining the total voltage value outside the relay in some embodiments of the present disclosure, the state of the relay can be directly obtained without determining the state of the relay, the second voltage value, the third voltage value, the resistance value of the first voltage dividing resistor, and the resistance value of the second voltage dividing resistor are obtained, and the total voltage value outside the relay is determined.

[0150] The above steps are processes for analyzing how to determine the total voltage value outside the relay for different states of the first relay and the second relay.

[0151] The above mainly introduces the scheme provided by some embodiments of the present disclosure from the perspective of the method. In order to implement the above functions, the relay total voltage value determination device or the vehicle includes at least one of the hardware structure or the software module corresponding to each function.

[0152] Those skilled in the art should easily realize that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, some embodiments of the present disclosure can be realized in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present disclosure.

[0153] Some embodiments of the present disclosure can divide the functions of the relay total voltage value determination device or the vehicle according to the above method, for example, the relay total voltage value determination device or the vehicle can include various function modules corresponding to each function division, or two or more functions can be integrated in one processing module.

[0154] The above integrated module can be realized in the form of hardware or in the form of a software function module. It should be noted that the division of the module in some embodiments of the present disclosure is illustrative, and is only a logical function division. Actual implementation can have another division manner.

[0155] FIG. 6 is a block diagram of a relay total voltage determination device according to some embodiments. Referring to FIG. 6, the relay total voltage value determination device 600 includes a determination module 601.

[0156] The determination module 601 is configured to determine a second voltage value of a voltage dividing resistor located on the positive side of the center contact, and a third voltage value of a voltage dividing resistor located on the negative side of the center contact.

[0157] The determination module 601 is further configured to determine a total voltage value outside the relay based on the first voltage value, the second voltage value, and the third voltage value.

[0158] In some embodiments, the determination module 601 is configured to determine a voltage value of a positive electrode outside the relay based on the first voltage value, the second voltage value, and a resistance value of the voltage dividing resistor located at the positive electrode side of the center contact; determine a voltage value of a negative electrode outside the relay based on the first voltage value, the third voltage value, and a resistance value of the voltage dividing resistor located at the negative electrode side of the center contact; and determine the total voltage value outside the relay based on the voltage value of the positive electrode outside the relay and the voltage value of the negative electrode outside the relay.

[0159] In some embodiments, the BMS further comprises an ADC chip; and the determination module 601 is configured to acquire the voltage value of the voltage dividing resistor located at the positive electrode side of the center contact by the ADC chip to obtain the second voltage value, and acquire the voltage value of the voltage dividing resistor located at the negative electrode side of the center contact to obtain the third voltage value.

[0160] In some embodiments, the total voltage value outside the relay determination apparatus further comprises an acquisition module 602. The acquisition module 602 is configured to acquire a current capability of the reference source corresponding to the first voltage value. The determination module 601 is further configured to determine the resistance values of the plurality of voltage dividing resistors based on the current capability of the reference source, the first voltage value, and a power supply voltage value of the BMS.

[0161] In some embodiments, the determination module 601 is further configured to determine a first current and a second current when the relay is in different states, respectively. For example, the first current is a current flowing through the voltage dividing resistor located at the positive electrode side of the center contact; and the second current is a current flowing through the voltage dividing resistor located at the negative electrode side of the center contact.

[0162] The determination module 601 is further configured to determine an output current value and an absorption current value required to be satisfied by the reference source based on the first current and the second current when the relay is in different states.

[0163] The determination module 601 is further configured to determine a specification of the reference source based on the output current value and the absorption current value.

[0164] In some embodiments, the relay comprises a first relay and a second relay. The first relay is connected to a positive electrode of a power supply of the BMS; and the second relay is connected to a negative electrode of the power supply of the BMS. The states of the first relay and the second relay comprise one of the following: the first relay is open and the second relay is closed; the first relay is closed and the second relay is open; the first relay is open and the second relay is open; and the first relay is closed and the second relay is closed.

[0165] According to the above technical means, the reference source can be connected to the center contact of the plurality of voltage division resistors and the power supply of the BMS, so as to clamp the voltage of the center contact of the plurality of voltage division resistors at the first voltage value, so that the BMS can connect the plurality of voltage division resistors outside the relay to the power supply through the reference source, so that when the relay is in different states, current flows through the plurality of voltage division resistors, so as to determine the total voltage outside the relay based on the voltage value of the plurality of voltage division resistors and the first voltage value, thereby realizing the determination of the total voltage outside the relay in different states of the relay, so that the BMS can control the charging logic of the vehicle based on the total voltage outside the relay.

[0166] In addition, the power supply of the reference source is provided by the BMS, avoiding the dependence of the reference source on external power supply, reducing the complexity of the internal structure of the BMS, and the BMS can also monitor the state of the reference source in real time, so as to discover faults in time and take corresponding measures, thereby improving the stability and reliability of the BMS.

[0167] As to the total voltage outside the relay determination device in the above embodiment, the operation mode of each module has been described in detail in the embodiment related to the method, and will not be described in detail here.

[0168] FIG. 7 is a block diagram of a vehicle according to some embodiments. As shown in FIG. 7, the vehicle 700 includes, but is not limited to, a processor 701 and a memory 702.

[0169] For example, the memory 702 is configured to store executable instructions of the processor 701. It can be understood that the processor 701 is configured to execute the instructions to implement the total voltage outside the relay determination method in the above embodiment.

[0170] It should be noted that those skilled in the art can understand that the vehicle structure shown in FIG. 7 does not constitute a limitation on the vehicle, and the vehicle can include more or fewer components than those shown in FIG. 7, or combine certain components, or different component arrangements.

[0171] The processor 701 is the control center of the vehicle, which connects various parts of the vehicle through various interfaces and lines, executes various functions of the vehicle and processes data by running or executing at least one of the software programs or modules stored in the memory 702 and calling the data stored in the memory 702, thereby monitoring the vehicle as a whole.

[0172] The processor 701 can include one or more processing units. For example, the processor 701 can integrate an application processor and a modem processor. For example, the application processor mainly processes the operating system, user interface and application programs, etc., and the modem processor mainly processes wireless communication. It can be understood that the above-mentioned modem processor can also not be integrated into the processor 701.

[0173] The memory 702 can be used to store software programs and various data. The memory 702 can mainly include a program storage area and a data storage area, for example, the program storage area can store an operating system, application programs required by at least one functional module (such as a determination unit, a processing unit, etc.), and the like. In addition, the memory 702 can include a high-speed random access memory, and can also include a non-volatile memory, for example, at least one magnetic disk storage device, a flash memory device, or other volatile solid-state memory device.

[0174] Some embodiments of the present disclosure also provide a computer readable storage medium including instructions, for example, the memory 702 including instructions, which can be executed by the processor 701 of the vehicle 700 to implement the relay external total voltage value determination method in the above embodiments.

[0175] In actual implementation, the functions of the determination module 601 and the acquisition module 602 in FIG. 6 can be implemented by the processor 701 in FIG. 7 invoking the computer program stored in the memory 702. The execution process can refer to the description of the method part in the above embodiments, which will not be described here.

[0176] For example, the computer readable storage medium can be a non-transitory computer readable storage medium, for example, the non-transitory computer readable storage medium can be a read-only memory (ROM), a random access memory (RAM), a compact disc read-only memory (CD-ROM), a magnetic tape, a floppy disk, and an optical data storage device, etc.

[0177] Some embodiments of the present disclosure also provide a computer program product including one or more instructions, which can be executed by the processor 701 of the vehicle to complete the relay external total voltage value determination method in the above embodiments.

[0178] It should be noted that the instructions in the above computer readable storage medium or the one or more instructions in the computer program product are executed by the processor of the vehicle to realize each process of the above method embodiments, and can achieve the same technical effects as the above method. To avoid repetition, it will not be described here.

[0179] Through the description of the above embodiments, those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above functional modules is taken as an example for illustration, and in actual application, the above functions can be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete the above described full classification part or part of the function.

[0180] In the embodiments provided by the present disclosure, it should be understood that the disclosed apparatus and method can be implemented in other manners. For example, the described apparatus embodiment is merely schematic. For example, the division of the modules or units is merely logical function division, and there can be another division manner in actual implementation. For example, a plurality of units or components can be combined or integrated into another apparatus, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections between different apparatuses can be indirect couplings or communication connections through some interfaces, apparatuses or units, and can be in electrical, mechanical or other forms.

[0181] The units described as separate components can or can not be physically separate, and the components displayed as units can be one physical unit or multiple physical units, i.e., can be located in one place or distributed in multiple different places. Some or all of the units can be selected according to actual needs to achieve the purposes of the embodiments of the present disclosure.

[0182] In addition, each functional unit in the various embodiments of the present disclosure can be integrated in one processing unit, or each unit can exist physically as a separate unit, or two or more units can be integrated in one unit. The integrated unit can be implemented in the form of hardware, or in the form of software functional units.

[0183] If the integrated unit is implemented in the form of software functional units and sold or used as an independent product, it can be stored in a readable storage medium. Based on such an understanding, the technical solutions of the embodiments of the present disclosure essentially, or the part that contributes to the prior art, or the whole classification or part of the technical solutions can be embodied in the form of a software product. The software product is stored in a storage medium, and includes several instructions for making a device (which can be a single chip, a chip, etc.) or a processor execute all or part of the steps of the methods in the various embodiments of the present disclosure. The foregoing storage medium includes: U disk, mobile hard disk, ROM, RAM, magnetic disk or optical disk, and various other media that can store program codes.

[0184] The above is merely specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and any change or replacement within the technical scope disclosed by the present disclosure should be covered in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A method for determining an external total voltage of a relay, applied to a battery management system (BMS) comprising the relay, the BMS comprising a reference source and a plurality of voltage dividing resistors; the relay is in series with the plurality of voltage dividing resistors; the reference source is configured to clamp a voltage of a center contact of the plurality of voltage dividing resistors at a first voltage value. The resistance values of the voltage dividing resistors on both sides of the center contact are equal; the method comprises: determining a second voltage value of the voltage dividing resistor on the positive side of the center contact and a third voltage value of the voltage dividing resistor on the negative side of the center contact; and determining a total voltage value outside the relay based on the first voltage value, the second voltage value and the third voltage value.

2. The method of claim 1, wherein, The determination of the total voltage value outside the relay based on the first voltage value, the second voltage value and the third voltage value comprises: determining a voltage value of the positive electrode outside the relay based on the first voltage value, the second voltage value and the resistance value of the voltage dividing resistor on the positive side of the center contact; determining a voltage value of the negative electrode outside the relay based on the first voltage value, the third voltage value and the resistance value of the voltage dividing resistor on the negative side of the center contact; and determining a total voltage value outside the relay based on the voltage value of the positive electrode outside the relay and the voltage value of the negative electrode outside the relay.

3. The method of claim 1, wherein, The BMS further comprises an analog-to-digital converter (ADC) chip; the determination of the second voltage value of the voltage dividing resistor on the positive side of the center contact and the third voltage value of the voltage dividing resistor on the negative side of the center contact comprises: acquiring, by the ADC chip, the voltage value of the voltage dividing resistor on the positive side of the center contact to obtain the second voltage value and acquiring the voltage value of the voltage dividing resistor on the negative side of the center contact to obtain the third voltage value.

4. The method of claim 1, further comprising: acquiring a current capability of a reference source conforming to the first voltage value; and determining the resistance values of the plurality of voltage dividing resistors based on the current capability of the reference source, the first voltage value and a power supply voltage value of the BMS.

5. The method of claim 1, wherein, Before the determination of the second voltage value of the voltage dividing resistor on the positive side of the center contact and the third voltage value of the voltage dividing resistor on the negative side of the center contact, the method further comprises: determining a first current and a second current when the relay is in different states respectively; wherein the first current is a current flowing through the voltage dividing resistor on the positive side of the center contact; the second current is a current flowing through the voltage dividing resistor on the negative side of the center contact; determining an output current value and an absorption current value required to be met by the reference source based on the first current and the second current when the relay is in different states; and determining the specification of the reference source based on the output current value and the absorption current value.

6. The method of claim 1, wherein, The relay comprises a first relay and a second relay; the first relay is connected to the positive electrode of the power supply of the BMS; the second relay is connected to the negative electrode of the power supply of the BMS; the state of the first relay and the second relay comprises one of the following: the first relay is open and the second relay is closed; the first relay is closed and the second relay is open; the first relay is open and the second relay is open; and the first relay is closed and the second relay is closed.

7. The method of any one of claims 1 to 6, wherein, The plurality of voltage division resistors comprises a first voltage division resistor, a second voltage division resistor, a third voltage division resistor and a fourth voltage division resistor connected in series. The voltage division resistors on the positive side of the center contact comprise the first voltage division resistor and the second voltage division resistor; the voltage division resistors on the negative side of the center contact comprise the third voltage division resistor and the fourth voltage division resistor.

8. A relay external total voltage determination apparatus applied to a battery management system (BMS) comprising a relay; the BMS comprising: a plurality of voltage division resistors connected in series with the relay; and a reference source for clamping the voltage of the center contact of the plurality of voltage division resistors at a first voltage value; wherein the resistance values of the voltage division resistors on both sides of the center contact are equal; the apparatus comprising a determination module; the determination module is configured to: determine a second voltage value of the voltage division resistors on the positive side of the center contact and a third voltage value of the voltage division resistors on the negative side of the center contact; and determine the relay external total voltage value based on the first voltage value, the second voltage value and the third voltage value.

9. The apparatus of claim 8, wherein, The determination module is further configured to: determine the voltage value of the relay external positive electrode based on the first voltage value, the second voltage value and the resistance value of the voltage division resistors on the positive side of the center contact; determine the voltage value of the relay external negative electrode based on the first voltage value, the third voltage value and the resistance value of the voltage division resistors on the negative side of the center contact; and determine the relay external total voltage value based on the voltage value of the relay external positive electrode and the voltage value of the relay external negative electrode.

10. The apparatus of claim 8, wherein, The BMS further comprises an analog-to-digital converter (ADC) chip; the determination module is further configured to: acquire the voltage value of the voltage division resistors on the positive side of the center contact through the ADC chip to obtain the second voltage value, and acquire the voltage value of the voltage division resistors on the negative side of the center contact to obtain the third voltage value.

11. The apparatus of any one of claims 8-10, wherein, The plurality of voltage division resistors comprises a first voltage division resistor, a second voltage division resistor, a third voltage division resistor and a fourth voltage division resistor connected in series. The voltage division resistors on the positive side of the center contact comprise the first voltage division resistor and the second voltage division resistor; the voltage division resistors on the negative side of the center contact comprise the third voltage division resistor and the fourth voltage division resistor.

12. A vehicle comprising: a processor; and a memory for storing instructions executable by the processor; wherein the processor is configured to execute the instructions to implement the method according to any one of claims 1 to 7.

13. A computer readable storage medium, wherein, When the computer-executable instructions stored in the computer-readable storage medium are executed by the processor of the vehicle, the vehicle is capable of performing the method according to any one of claims 1 to 7.

14. A computer program product, wherein, The computer program product comprises computer instructions which, when run on the vehicle, cause the vehicle to perform the method according to any one of claims 1 to 7.

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