Method and device for determining supply voltage threshold of contactor in power battery pack system

Abstract

The present invention discloses a method and device for determining a supply voltage threshold value of a contactor in a power battery pack system, wherein the method comprises: determining an initial threshold voltage of the contactor, and determining a maximum pull-in voltage of the contactor under full temperature conditions; when the contactor is working normally, gradually reducing the supply voltage provided by a power supply source to the contactor until a supply voltage shortage fault occurs in the contactor, and then determining a first supply voltage; determining a boundary voltage lower limit value according to the initial threshold voltage and the first supply voltage, and determining a boundary voltage upper limit value according to the maximum pull-in voltage, the initial threshold voltage and the first supply voltage; determining the supply voltage threshold value of the contactor according to the boundary voltage lower limit value and the boundary voltage upper limit value, thereby, the method determines the supply voltage threshold value according to the actual situation of the contactor, so that the setting of the supply voltage threshold value is more accurate and effective, thereby ensuring the normal use of the power battery pack.

Description

Technical Field

[0001] The present invention relates to the field of power battery technology, and in particular to a method for determining a power supply voltage threshold of a contactor in a power battery pack system, a power battery pack system, a computer-readable storage medium, and a device for determining a power supply voltage threshold of a contactor in a power battery pack system. Background Art

[0002] For the current new energy power battery pack, the battery distribution unit (BDU) is basically built in. The contactor in the power battery pack is controlled by the power supply control module in the BMS (Battery Management System) board. To ensure the normal output of the power battery pack, the BMS board will control the contactor in the BDU to close or disconnect through the power supply control module. In order to ensure normal control, the BMS software will set a threshold for the supply voltage of the contactor to ensure that the contactor can work normally. When the threshold is exceeded, the BMS will issue an alarm to protect driving safety.

[0003] The existing threshold setting scheme basically determines the power supply voltage threshold based on existing projects and usage experience. When the test fails or there is an abnormality during use, the purpose is achieved by adjusting the supply voltage threshold of the contactor. The basis for setting the supply voltage threshold cannot be clearly determined. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the first purpose of the present invention is to propose a method for determining a supply voltage threshold of a contactor in a power battery pack system, which determines the supply voltage threshold according to the actual situation of the contactor, making the setting of the supply voltage threshold more accurate and effective, and ensuring the normal use of the power battery pack.

[0005] A second objective of the present invention is to provide a power battery pack system.

[0006] A third object of the present invention is to provide a computer-readable storage medium.

[0007] A fourth objective of the present invention is to provide a device for determining a supply voltage threshold of a contactor in a power battery pack system.

[0008] To achieve the above-mentioned purpose, an embodiment of the first aspect of the present invention proposes a method for determining a supply voltage threshold of a contactor in a power battery pack system, wherein the contactor is powered by a power supply, and the method comprises: determining an initial threshold voltage of the contactor, and determining a maximum pull-in voltage of the contactor under full temperature conditions; when the contactor is working normally, gradually reducing the supply voltage provided to the contactor by the power supply until a supply voltage shortage fault occurs in the contactor, and then determining a first supply voltage; determining a lower limit value of a boundary voltage according to the initial threshold voltage and the first supply voltage, and determining an upper limit value of a boundary voltage according to the maximum pull-in voltage, the initial threshold voltage and the first supply voltage; determining a supply voltage threshold of the contactor according to the lower limit value of the boundary voltage and the upper limit value of the boundary voltage.

[0009] According to the method for determining the supply voltage threshold of the contactor in the power battery pack system of the embodiment of the present invention, the initial threshold voltage of the contactor is first determined, and the maximum pull-in voltage of the contactor under full temperature conditions is determined, and when the contactor is working normally, the supply voltage provided to the contactor by the power supply is gradually reduced until the contactor has a supply voltage shortage fault, and then the first supply voltage is determined, and then the boundary voltage lower limit is determined according to the initial threshold voltage and the first supply voltage, and the boundary voltage upper limit is determined according to the maximum pull-in voltage, the initial threshold voltage and the first supply voltage, and finally, the supply voltage threshold of the contactor is determined according to the boundary voltage lower limit and the boundary voltage upper limit. Therefore, the method determines the supply voltage threshold according to the actual situation of the contactor, so that the setting of the supply voltage threshold is more accurate and effective, and the normal use of the power battery pack is ensured.

[0010] In addition, the method for determining the supply voltage threshold of a contactor in a power battery pack system according to the above embodiment of the present invention may also have the following additional technical features:

[0011] According to one embodiment of the present invention, determining the first supply voltage includes: determining a voltage step for gradually reducing the supply voltage of the contactor; and taking the sum of the supply voltage when the contactor has an insufficient supply voltage fault and the voltage step as the first supply voltage.

[0012] According to an embodiment of the present invention, determining the initial threshold voltage of the contactor includes: acquiring a minimum power supply voltage provided to the contactor by the power supply, and determining the initial threshold voltage according to the minimum power supply voltage.

[0013] According to an embodiment of the present invention, the initial threshold voltage is less than the minimum power supply voltage, and the voltage difference between the minimum power supply voltage and the initial threshold voltage is less than or equal to a first preset voltage threshold.

[0014] According to one embodiment of the present invention, determining the lower limit value of the boundary voltage based on the initial threshold voltage and the first power supply voltage includes: determining the voltage difference between the first power supply voltage and the initial threshold voltage; subtracting the voltage difference between the first power supply voltage and the initial threshold voltage from the minimum power supply voltage to obtain the lower limit value of the boundary voltage.

[0015] According to one embodiment of the present invention, the boundary voltage upper limit value is determined based on the maximum pull-in voltage, the initial threshold voltage and the first power supply voltage, including: determining the voltage drop between the contactor and the battery manager in the power battery pack system based on the voltage difference between the first power supply voltage and the initial threshold voltage; and taking the sum of the maximum pull-in voltage and the voltage drop as the boundary voltage upper limit value.

[0016] According to one embodiment of the present invention, the supply voltage threshold of the contactor is calculated according to the following formula:

[0017] U Threshold =(U border1 +U border2 ) / 2

[0018] Among them, U Threshold Indicates the supply voltage threshold of the contactor, U border1 Indicates the lower limit of boundary voltage, U border2 Indicates the upper limit of the boundary voltage.

[0019] To achieve the above-mentioned purpose, the second aspect of the embodiment of the present invention proposes a power battery pack system, including a memory, a processor, and a power supply voltage threshold determination program for a contactor in the power battery pack system, which is stored in the memory and can be run on the processor. When the processor executes the power supply voltage threshold determination program, the above-mentioned power battery pack system contactor power supply voltage threshold determination method is implemented.

[0020] According to the power battery pack system of the embodiment of the present invention, based on the aforementioned method for determining the supply voltage threshold of the contactor in the power battery pack system, the setting of the supply voltage threshold is more accurate and effective, thereby ensuring the normal use of the power battery pack.

[0021] To achieve the above-mentioned objectives, an embodiment of the third aspect of the present invention proposes a computer-readable storage medium, on which a program for determining a power supply voltage threshold of a contactor in a power battery pack system is stored. When the program for determining a power supply voltage threshold of a contactor in a power battery pack system is executed by a processor, the above-mentioned method for determining a power supply voltage threshold of a contactor in a power battery pack system is implemented.

[0022] According to the computer-readable storage medium of the embodiment of the present invention, based on the aforementioned power supply voltage threshold determination method of the contactor in the power battery pack system, the setting of the power supply voltage threshold is made more accurate and effective, and the normal use of the power battery pack is ensured. To achieve the above purpose, the fourth aspect of the present invention proposes a power supply voltage threshold determination device for the contactor in the power battery pack system, the contactor is powered by a power supply, and the device includes: a first determination module, used to determine the initial threshold voltage of the contactor, and determine the maximum pull-in voltage of the contactor under full temperature conditions; a second determination module, used to gradually reduce the power supply voltage provided to the contactor by the power supply when the contactor is working normally, until the contactor has a power supply voltage shortage fault, and determine the first power supply voltage; a first calculation module, used to determine the lower limit of the boundary voltage according to the initial threshold voltage and the first power supply voltage, and determine the upper limit of the boundary voltage according to the maximum pull-in voltage, the initial threshold voltage and the first power supply voltage; a second calculation module, used to determine the supply voltage threshold of the contactor according to the lower limit of the boundary voltage and the upper limit of the boundary voltage.

[0023] According to the power supply voltage threshold determination device of the contactor in the power battery pack system of the embodiment of the present invention, the initial threshold voltage of the contactor is determined by the first determination module, and the maximum pull-in voltage of the contactor under full temperature conditions is determined. When the contactor is working normally, the power supply voltage provided to the contactor by the power supply is gradually reduced by the second determination module until the contactor has a power supply voltage shortage fault, and the first power supply voltage is determined. The first calculation module determines the lower limit of the boundary voltage according to the initial threshold voltage and the first power supply voltage, and determines the upper limit of the boundary voltage according to the maximum pull-in voltage, the initial threshold voltage and the first power supply voltage. The second calculation module determines the supply voltage threshold of the contactor according to the lower limit of the boundary voltage and the upper limit of the boundary voltage. Thus, the device determines the supply voltage threshold according to the actual situation of the contactor, so that the setting of the supply voltage threshold is more accurate and effective, and the normal use of the power battery pack is ensured.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a flow chart of a method for determining a supply voltage threshold of a contactor in a power battery pack system according to an embodiment of the present invention;

[0026] Figure 2 A connection diagram of a power battery pack system according to an embodiment of the present invention;

[0027] Figure 3 This is a flow chart of a method for determining a supply voltage threshold of a contactor in a power battery pack system according to an embodiment of the present invention;

[0028] Figure 4 is a flow chart of calculating the upper limit value of the boundary voltage according to a specific embodiment of the present invention;

[0029] Figure 5 is a block diagram of a power battery pack system according to an embodiment of the present invention;

[0030] Figure 6 The figure is a block diagram of a device for determining a supply voltage threshold of a contactor in a power battery pack system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0032] The following describes, with reference to the accompanying drawings, a method for determining a supply voltage threshold of a contactor in a power battery pack system, a power battery pack system, a computer-readable storage medium, and a device for determining a supply voltage threshold of a contactor in a power battery pack system proposed in embodiments of the present invention.

[0033] Figure 1 The present invention is a flow chart of a method for determining a supply voltage threshold of a contactor in a power battery pack system according to an embodiment of the present invention.

[0034] In one embodiment of the present invention, the contactor is powered by a power supply.

[0035] Specifically, Figure 2 As shown, the vehicle end provides low-voltage power to the power battery pack 20 through the power supply 10, the low-voltage interface 30 of the power battery pack 20 is connected to the power supply 10 of the vehicle end through a wiring harness, the low-voltage interface 30 is connected to the battery manager 40 inside the power battery pack 20 through a wiring harness, and the power supply control module 41 in the battery manager 40 is connected to the contactor 51 in the battery distribution box 50 through a wiring harness. During the application process, the low-voltage electricity provided by the power supply 10 enters the power battery pack 20 through the low-voltage interface 30, first enters the battery manager 40, and then is provided to the contactor 51 through the power supply control module 41 to control the attraction or disconnection of each contactor 51 in the battery distribution box 50.

[0036] like Figure 1 As shown, the method for determining the supply voltage threshold of the contactor in the power battery pack system of the embodiment of the present invention includes:

[0037] S1, determine the initial threshold voltage of the contactor and determine the maximum pull-in voltage of the contactor under full temperature conditions. The initial threshold voltage can be set according to actual conditions.

[0038] Specifically, the initial threshold voltage U0 is set in advance according to the actual situation, and the maximum value of the minimum pull-in voltage of the contactor under full temperature conditions is selected as the maximum pull-in voltage U operate .

[0039] According to an embodiment of the present invention, determining the initial threshold voltage of the contactor includes: acquiring a minimum power supply voltage provided to the contactor by the power supply, and determining the initial threshold voltage according to the minimum power supply voltage.

[0040] According to an embodiment of the present invention, the initial threshold voltage is less than the minimum supply voltage, and the voltage difference between the minimum supply voltage and the initial threshold voltage is less than or equal to a first preset voltage threshold, wherein the first preset voltage threshold can be set according to actual conditions.

[0041] That is to say, the initial threshold voltage U0 needs to be slightly smaller than the minimum supply voltage U min , taking the first preset voltage threshold as 0.3V as an example, the initial threshold voltage U0 is equal to the minimum supply voltage U min The difference cannot exceed 0.3V.

[0042] S2, when the contactor is working normally, the power supply voltage provided by the power supply to the contactor is gradually reduced until the contactor has a power supply voltage insufficient fault, and then the first power supply voltage is determined.

[0043] That is, first construct a wire harness using standard test lengths such as Figure 2 The connection line shown connects the power supply 10 to the low voltage interface 30 of the power battery pack 20, and controls the contactor 51 to be attracted through the power supply control module 41 of the battery manager 40, so that the power supply 10 supplies power to the contactor 51 normally, and the power battery pack 20 is in a normal working state. Then, the power supply voltage of the power supply 10 is gradually reduced and adjusted. When the power supply voltage provided by the power supply 10 cannot meet the normal working requirements of the contactor 51, the battery manager 40 issues an alarm prompt that the contactor has an insufficient power supply voltage fault. The corresponding supply voltage is used as the fault voltage when the contactor has an insufficient power supply voltage fault for the first time, and a voltage value slightly larger than the fault voltage is determined as the first supply voltage U1. That is to say, the first supply voltage U1 is not the supply voltage when the fault occurs for the first time, but the voltage value closest to the fault before the fault occurs. For example, the adjustment threshold voltage can be pre-set, and the sum of the fault voltage and the adjustment pre-made voltage is used as the first supply voltage U1.

[0044] It should be noted that whether the above-mentioned contactor has a power supply voltage insufficient fault can be determined by the battery manager on the working state of the main contactor in the battery distribution box, and the specific setting can be made according to the actual situation.

[0045] According to one embodiment of the present invention, determining the first supply voltage includes: determining a voltage step length for gradually reducing the supply voltage of the contactor; and taking the sum of the supply voltage when the contactor has an insufficient supply voltage fault and the voltage step length as the first supply voltage. The voltage step length can be preset according to actual conditions.

[0046] Specifically, taking the voltage step of 0.1V, the battery manager determines whether the contactor has a power supply voltage shortage fault according to the working status of the main contactor in the battery distribution box. First, ensure that the power supply provides low-voltage power to the contactor and the power battery pack is in normal working condition. Then manually adjust the voltage value of the power supply to reduce the voltage by 0.1V intervals, and observe the system fault code fed back by the battery manager until the battery manager detects that the main contactor has a power supply voltage shortage fault. Record the power supply voltage at this time as the fault voltage, and then add 0.1V to the fault voltage to obtain the first power supply voltage U1. In other words, the voltage value of the previous level before the fault voltage is adjusted is used as the most adjacent voltage value before the first fault occurs, that is, the first power supply voltage U1. For example, assuming that the minimum power supply voltage U in the system min It is 9V, the preset initial threshold voltage U0 is 8.7V, and the power battery pack and the power supply are connected using a standard test length harness. The contactor is energized to make the power battery pack work normally. At this time, the power supply voltage is 12V, and then the power supply voltage is reduced at a voltage interval of 0.1V. Assuming that when the power supply voltage is 9.2V, the main contactor has a supply voltage shortage failure, then 9.3V is the first supply voltage U1. It can be understood that when the supply voltage is 9.3V, the working state is normal.

[0047] S3, determining a lower limit value of the boundary voltage according to the initial threshold voltage and the first power supply voltage, and determining an upper limit value of the boundary voltage according to the maximum pull-in voltage, the initial threshold voltage and the first power supply voltage.

[0048] That is to say, the lower limit value of the boundary voltage U can be calculated by using the preset corresponding relationship or calculation formula respectively through the above-obtained initial threshold voltage U0 and the first supply voltage U1. border1 , and the maximum pull-in voltage U obtained by the above operate , the initial threshold voltage U0 and the first supply voltage U1 to calculate the lower limit value of the boundary voltage U border2 The specific calculation formula can be set according to actual conditions.

[0049] According to one embodiment of the present invention, determining the lower limit value of the boundary voltage based on the initial threshold voltage and the first power supply voltage includes: determining the voltage difference between the first power supply voltage and the initial threshold voltage; subtracting the voltage difference between the first power supply voltage and the initial threshold voltage from the minimum power supply voltage to obtain the lower limit value of the boundary voltage.

[0050] Specifically, continue with the above minimum supply voltage U min For example, the initial threshold voltage U0 is 8.7V and the first supply voltage U1 is 9.3V. First, the voltage drop ΔU1 from the power supply to the battery manager is 0.6V by subtracting the initial threshold voltage U0 from the first supply voltage U1. Then, the minimum supply voltage U min Subtract the voltage drop ΔU1 to get the lower limit of the boundary voltage U border1 is 8.4V.

[0051] According to one embodiment of the present invention, the boundary voltage upper limit value is determined based on the maximum pull-in voltage, the initial threshold voltage and the first power supply voltage, including: determining the voltage drop between the contactor and the battery manager in the power battery pack system based on the voltage difference between the first power supply voltage and the initial threshold voltage; and taking the sum of the maximum pull-in voltage and the voltage drop as the boundary voltage upper limit value.

[0052] For details, please refer to Figure 2 , the harness length between the power supply 10 and the low-voltage interface 30 is L1, the harness length between the low-voltage interface 30 and the battery manager 40 is L2, and the harness length between the battery manager 40 and the battery distribution box is L3. Through comparative calculations of multiple projects, for the inside of the power battery pack 20, the harness length L3 from the battery manager 40 to the battery distribution box 50 generally does not exceed one-third of the sum of L1 and L2. Since the harness voltage drop is mainly caused by the internal resistance of the harness itself, it can be calculated by the formula To calculate the voltage drop ΔU2 from the battery manager 40 to the contactor 51 in the battery distribution box 50, where ΔU1 is the voltage drop from the power supply 10 to the battery manager 40 obtained by the formula ΔU1=U1-U0, and then the voltage drop ΔU2 is multiplied by the maximum pull-in voltage U operate Add together to get the upper limit value of boundary voltage U border2 For example, assuming the maximum pull-in voltage U operate is 7.8V, ΔU1 is 0.6V, then ΔU2 is 0.2V, and the upper limit value of the boundary voltage U border2 is 8V.

[0053] S4, determining a supply voltage threshold of the contactor according to a lower limit value of the boundary voltage and an upper limit value of the boundary voltage.

[0054] That is to say, the contactor supply voltage threshold U set by the battery manager ThresholdThe lower limit value of the boundary voltage U calculated above is border1 And the upper limit of the boundary voltage U border2 The specific calculation formula or setting method can be set according to the actual situation of the power battery pack.

[0055] Taking into account data collection and calculation errors, in one embodiment of the present invention, the supply voltage threshold of the contactor is calculated according to the following formula:

[0056] U Threshold =(U border1 +U border2 ) (1)

[0057] Among them, U Threshold Indicates the supply voltage threshold of the contactor, U border1 Indicates the lower limit of boundary voltage, U border2 Indicates the upper limit of the boundary voltage.

[0058] That is to say, considering the lower limit value of the boundary voltage U border1 , boundary voltage upper limit value U border2 The lower limit value of the boundary voltage U border1 And the upper limit of the boundary voltage U border2 The average value is used as the supply voltage threshold U of the contactor Threshold .

[0059] Furthermore, the method for determining the supply voltage threshold of the contactor in the power battery pack system proposed in the embodiment of the present invention makes a final determination of the supply voltage threshold based on the actual working conditions of the power battery pack and the use of the device. This is more accurate and effective than the previous general threshold setting method based on usage experience, and the threshold range is reasonably determined to ensure the normal use of the entire vehicle.

[0060] As a specific embodiment of the present invention, Figure 3 As shown, a method for determining a supply voltage threshold of a contactor in a power battery pack system includes the following steps:

[0061] S101, obtaining the minimum supply voltage U of the power supply min .

[0062] S102, determining an initial threshold voltage U0 of the contactor.

[0063] S103, use the standard test length wiring harness to connect the power supply and the power battery pack, and close the contactor.

[0064] S104, the supply voltage is gradually reduced until a supply voltage insufficient fault occurs in the contactor, and the first supply voltage U1 is determined.

[0065] S105, determining a voltage difference ΔU1=U1-U0 between the first supply voltage and the initial threshold voltage;

[0066] S106, calculating the lower limit value of the boundary voltage U border1 , boundary voltage upper limit value U border2 .

[0067] S107, determine the supply voltage threshold U of the contactor Threshold =(U border1 +U border2 ) / 2.

[0068] Among them, the above boundary voltage lower limit value is calculated by formula U border1 =U min -ΔU1 is calculated.

[0069] like Figure 4 As shown, the above calculation of the boundary voltage upper limit value includes the following steps:

[0070] S201, determine the maximum pull-in voltage U of the contactor under full temperature conditions operate .

[0071] S202, calculate the voltage drop between the contactor and the battery manager

[0072] S203, calculating the boundary voltage upper limit value U border2 =U operate +ΔU2.

[0073] In summary, according to the method for determining the supply voltage threshold of the contactor in the power battery pack system of the embodiment of the present invention, the initial threshold voltage of the contactor is first determined, and the maximum pull-in voltage of the contactor under full temperature conditions is determined, and when the contactor is working normally, the supply voltage provided to the contactor by the power supply is gradually reduced until the contactor has a supply voltage shortage fault, and the first supply voltage is determined, and then the lower limit of the boundary voltage is determined according to the initial threshold voltage and the first supply voltage, and the upper limit of the boundary voltage is determined according to the maximum pull-in voltage, the initial threshold voltage and the first supply voltage, and finally, the supply voltage threshold of the contactor is determined according to the lower limit of the boundary voltage and the upper limit of the boundary voltage. Therefore, the method determines the supply voltage threshold according to the actual situation of the contactor, so that the setting of the supply voltage threshold is more accurate and effective, and the normal use of the power battery pack is ensured.

[0074] Corresponding to the above embodiment, the present invention also proposes a power battery pack system.

[0075] like Figure 5As shown, the power battery pack system 100 of the embodiment of the present invention includes a memory 110, a processor 120, and a power supply voltage threshold determination program for the contactor in the power battery pack system, which is stored in the memory 110 and can be run on the processor 120. When the processor 120 executes the power supply voltage threshold determination program, the above-mentioned power battery pack system contactor power supply voltage threshold determination method is implemented.

[0076] For example, the processor 120 may be configured to execute the above method embodiments according to instructions in the computer program.

[0077] In some embodiments of the present application, the processor 120 may include but is not limited to:

[0078] General-purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, etc.

[0079] In some embodiments of the present application, the memory 110 includes but is not limited to:

[0080] Volatile memory and / or non-volatile memory. Among them, the non-volatile memory can be read-only memory (ROM), programmable ROM (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM) or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link DRAM (SLDRAM), and direct RAM bus random access memory (DR RAM).

[0081] In some embodiments of the present application, the computer program may be divided into one or more modules, which are stored in the memory 110 and executed by the processor 120 to complete the method provided by the present application. The one or more modules may be a series of computer program instruction segments capable of completing specific functions, and the instruction segments are used to describe the execution process of the computer program in the video production device.

[0082] like Figure 5 As shown, the power battery pack system 100 may further include:

[0083] The transceiver 130 may be connected to the processor 120 or the memory 110 .

[0084] The processor 120 may control the transceiver 130 to communicate with other devices, specifically, to send information or data to other devices, or to receive information or data sent by other devices. The transceiver 130 may include a transmitter and a receiver. The transceiver 130 may further include an antenna, and the number of antennas may be one or more.

[0085] It should be understood that the various components in the power battery pack system 100 are connected via a bus system, wherein the bus system includes not only a data bus but also a power bus, a control bus and a status signal bus.

[0086] According to the power battery pack system of the embodiment of the present invention, based on the aforementioned method for determining the supply voltage threshold of the contactor in the power battery pack system, the setting of the supply voltage threshold is more accurate and effective, thereby ensuring the normal use of the power battery pack.

[0087] Corresponding to the above embodiment, the present invention also proposes a computer-readable storage medium.

[0088] The computer-readable storage medium of an embodiment of the present invention stores a program for determining the power supply voltage threshold of a contactor in a power battery pack system. When the program for determining the power supply voltage threshold of a contactor in a power battery pack system is executed by a processor, the method for determining the power supply voltage threshold of a contactor in a power battery pack system is implemented.

[0089] According to the computer-readable storage medium of an embodiment of the present invention, based on the aforementioned method for determining the supply voltage threshold of a contactor in a power battery pack system, the setting of the supply voltage threshold is made more accurate and effective, thereby ensuring the normal use of the power battery pack. Corresponding to the above embodiment, the present invention also proposes a device for determining the supply voltage threshold of a contactor in a power battery pack system.

[0090] In one embodiment of the present invention, the contactor is powered by a power supply.

[0091] like Figure 6 As shown, the device for determining the supply voltage threshold of a contactor in a power battery pack system according to an embodiment of the present invention may include: a first determination module 60 , a second determination module 70 , a first calculation module 80 and a second calculation module 90 .

[0092] Among them, the first determination module 60 is used to determine the initial threshold voltage of the contactor and determine the maximum pull-in voltage of the contactor under full temperature conditions. The second determination module 70 is used to gradually reduce the power supply voltage provided to the contactor by the power supply when the contactor is working normally, until the contactor has a power supply voltage shortage fault, and then determine the first power supply voltage. The first calculation module 80 is used to determine the lower limit of the boundary voltage according to the initial threshold voltage and the first power supply voltage, and determine the upper limit of the boundary voltage according to the maximum pull-in voltage, the initial threshold voltage and the first power supply voltage. The second calculation module 90 is used to determine the supply voltage threshold of the contactor according to the lower limit of the boundary voltage and the upper limit of the boundary voltage.

[0093] According to one embodiment of the present invention, the second determination module 70 determines the first supply voltage, specifically for: determining the voltage step for gradually reducing the supply voltage of the contactor; taking the sum of the supply voltage and the voltage step when the contactor has an insufficient supply voltage fault as the first supply voltage.

[0094] According to an embodiment of the present invention, the first determination module 60 determines the initial threshold voltage of the contactor, specifically for: obtaining the minimum power supply voltage provided to the contactor by the power supply, and determining the initial threshold voltage according to the minimum power supply voltage.

[0095] According to an embodiment of the present invention, the initial threshold voltage is less than the minimum power supply voltage, and the voltage difference between the minimum power supply voltage and the initial threshold voltage is less than or equal to a first preset voltage threshold.

[0096] According to one embodiment of the present invention, the first calculation module 80 determines the lower limit value of the boundary voltage based on the initial threshold voltage and the first supply voltage, and is specifically used to: determine the voltage difference between the first supply voltage and the initial threshold voltage; subtract the voltage difference between the first supply voltage and the initial threshold voltage from the minimum supply voltage to obtain the lower limit value of the boundary voltage.

[0097] According to one embodiment of the present invention, the first calculation module 80 determines the upper limit value of the boundary voltage based on the maximum pull-in voltage, the initial threshold voltage and the first power supply voltage, and is specifically used to: determine the voltage drop between the contactor and the battery manager in the power battery pack system based on the voltage difference between the first power supply voltage and the initial threshold voltage; and take the sum of the maximum pull-in voltage and the voltage drop as the upper limit value of the boundary voltage.

[0098] According to one embodiment of the present invention, the second calculation module 90 calculates the supply voltage threshold of the contactor according to the following formula:

[0099] U Threshold =(U border1 +U border2 ) / 2

[0100] Among them, U Threshold Indicates the supply voltage threshold of the contactor, U border1 Indicates the lower limit of boundary voltage, U border2 Indicates the upper limit of the boundary voltage.

[0101] It should be noted that for details not disclosed in the device for determining the power supply voltage threshold of the contactor in the power battery pack system in the embodiment of the present invention, please refer to the details disclosed in the method for determining the power supply voltage threshold of the contactor in the power battery pack system in the above embodiment of the present invention, and the details will not be repeated here.

[0102] According to the power supply voltage threshold determination device of the contactor in the power battery pack system of the embodiment of the present invention, the initial threshold voltage of the contactor is determined by the first determination module, and the maximum pull-in voltage of the contactor under full temperature conditions is determined. When the contactor is working normally, the power supply voltage provided to the contactor by the power supply is gradually reduced by the second determination module until the contactor has a power supply voltage shortage fault, and the first power supply voltage is determined. The first calculation module determines the lower limit of the boundary voltage according to the initial threshold voltage and the first power supply voltage, and determines the upper limit of the boundary voltage according to the maximum pull-in voltage, the initial threshold voltage and the first power supply voltage. The second calculation module determines the supply voltage threshold of the contactor according to the lower limit of the boundary voltage and the upper limit of the boundary voltage. Thus, the device determines the supply voltage threshold according to the actual situation of the contactor, so that the setting of the supply voltage threshold is more accurate and effective, and the normal use of the power battery pack is ensured.

[0103] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0104] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0105] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0106] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0107] In the present invention, unless otherwise clearly specified and limited, the terms "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, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0108] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for determining a supply voltage threshold of a contactor in a power battery pack system, characterized in that: The contactor is powered by a power supply, and the method comprises: Determining an initial threshold voltage of the contactor and determining a maximum pull-in voltage of the contactor under full temperature conditions; When the contactor is operating normally, the power supply voltage provided by the power supply to the contactor is gradually reduced until the contactor has a power supply voltage shortage fault, and then the first power supply voltage is determined; Determine a lower limit value of a boundary voltage according to the initial threshold voltage and the first supply voltage, and determine an upper limit value of a boundary voltage according to the maximum pull-in voltage, the initial threshold voltage and the first supply voltage; Determine the supply voltage threshold of the contactor according to the boundary voltage lower limit value and the boundary voltage upper limit value; Determining an initial threshold voltage of the contactor, comprising: Acquire a minimum power supply voltage provided by the power supply to the contactor, and determine the initial threshold voltage according to the minimum power supply voltage; The initial threshold voltage is less than the minimum supply voltage, and a voltage difference between the minimum supply voltage and the initial threshold voltage is less than or equal to a first preset voltage threshold.

2. The method according to claim 1, characterized in that Determining a first supply voltage includes: Determining a voltage step size for gradually decreasing the supply voltage of the contactor; The sum of the supply voltage when the contactor has a supply voltage insufficient fault and the voltage step length is used as the first supply voltage.

3. The method according to claim 1, characterized in that Determining a lower limit value of a boundary voltage according to the initial threshold voltage and the first supply voltage includes: determining a voltage difference between the first supply voltage and the initial threshold voltage; The voltage lower limit value of the boundary voltage is obtained by subtracting the voltage difference between the first power supply voltage and the initial threshold voltage from the minimum power supply voltage.

4. The method according to claim 3, characterized in that Determining a boundary voltage upper limit value according to the maximum pull-in voltage, the initial threshold voltage and the first supply voltage includes: Determining a voltage drop between the contactor and a battery manager in the power battery pack system according to a voltage difference between the first supply voltage and the initial threshold voltage; The sum of the maximum pull-in voltage and the voltage drop is used as the upper limit value of the boundary voltage.

5. The method according to claim 1, characterized in that The supply voltage threshold of the contactor is calculated according to the following formula: in, represents the supply voltage threshold of the contactor, represents the lower limit value of the boundary voltage, Indicates the upper limit value of the boundary voltage.

6. A power battery pack system, characterized in that: The invention comprises a memory, a processor and a program for determining a power supply voltage threshold of a contactor in a power battery pack system which is stored in the memory and can be run on the processor. When the processor executes the program for determining the power supply voltage threshold, a method for determining a power supply voltage threshold of a contactor in a power battery pack system according to any one of claims 1 to 5 is implemented.

7. A computer-readable storage medium, characterized in that: A power supply voltage threshold determination program for the contactor in the power battery pack system is stored thereon, and when the power supply voltage threshold determination program for the contactor in the power battery pack system is executed by the processor, a power supply voltage threshold determination method for the contactor in the power battery pack system according to any one of claims 1-5 is implemented.

8. A device for determining a supply voltage threshold of a contactor in a power battery pack system, characterized in that: The contactor is powered by a power supply, and the device comprises: A first determination module is used to determine an initial threshold voltage of the contactor and determine a maximum pull-in voltage of the contactor under full temperature conditions; A second determination module is used to gradually reduce the power supply voltage provided by the power supply to the contactor when the contactor is working normally, until the contactor has a power supply voltage insufficient fault, and then determine the first power supply voltage; a first calculation module, configured to determine a lower limit value of a boundary voltage according to the initial threshold voltage and the first supply voltage, and to determine an upper limit value of a boundary voltage according to the maximum pull-in voltage, the initial threshold voltage and the first supply voltage; A second calculation module, used to determine the supply voltage threshold of the contactor according to the boundary voltage lower limit value and the boundary voltage upper limit value; Determining an initial threshold voltage of the contactor, comprising: Acquire a minimum power supply voltage provided by the power supply to the contactor, and determine the initial threshold voltage according to the minimum power supply voltage; The initial threshold voltage is less than the minimum supply voltage, and a voltage difference between the minimum supply voltage and the initial threshold voltage is less than or equal to a first preset voltage threshold.

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