CN116577565A - Method and device for detecting capacitance of power battery, storage medium and electronic device - Google Patents

Method and device for detecting capacitance of power battery, storage medium and electronic device Download PDF

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Publication number
CN116577565A
CN116577565A CN202310574557.5A CN202310574557A CN116577565A CN 116577565 A CN116577565 A CN 116577565A CN 202310574557 A CN202310574557 A CN 202310574557A CN 116577565 A CN116577565 A CN 116577565A
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China
Prior art keywords
voltage
resistor
target
switch
power battery
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CN202310574557.5A
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Inventor
盛毅
李威
姜涛
姜磊
陈德松
张星烁
孟凡琪
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FAW Group Corp
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FAW Group Corp
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Priority to CN202310574557.5A priority Critical patent/CN116577565A/en
Publication of CN116577565A publication Critical patent/CN116577565A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2605—Measuring capacitance
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a method and a device for detecting capacitance of a power battery, a storage medium and an electronic device, and relates to the technical field of vehicles. Wherein the method comprises the following steps: receiving a target control instruction, and according to a preset sequence, controlling the on state of a switch, determining a first voltage of a first resistor, a second voltage of a second resistor, a third voltage of a third resistor and a fourth voltage of a fourth resistor, wherein the first resistor, the second resistor, the third resistor and the fourth resistor are positioned outside a power battery, and the power battery comprises a target capacitor; determining a target capacitance value of the target capacitor according to the first voltage, the second voltage, the third voltage, the fourth voltage and the equivalent resistance value; the target capacitance is detected based on the target capacitance value. The invention solves the technical problems that the method is limited, not easy to realize and the detection accuracy is lower because the related technology is based on important assumption by carrying out Y capacitance detection on the power battery in the electric automobile.

Description

Method and device for detecting capacitance of power battery, storage medium and electronic device
Technical Field
The present invention relates to the field of vehicle technologies, and in particular, to a method and an apparatus for detecting capacitance of a power battery, a storage medium, and an electronic apparatus.
Background
With the rapid development of electric vehicles, the safety and reliability of a high-voltage system, which is one of the electric vehicle marks, are receiving more and more attention. Because of factors such as electromagnetic interference and objective environment, a capacitor, namely a Y capacitor, exists between the high-voltage system and the low-voltage system, and the high-voltage system of the electric automobile often has potential safety hazards of high-voltage electric shock. Therefore, to ensure that the energy stored by the Y capacitance does not cause personnel to get at risk of electric shock, accurate detection of the Y capacitance is necessary.
At present, a high-voltage assembly, namely a power battery, of a vehicle-mounted rechargeable energy storage system (On-board rechargeable energy storage system, REESS) in an electric automobile is used for detecting the Y capacitance, and a loop comprising the power battery, the Y capacitance, an insulation resistor, a balance resistor, a discharge resistor and a switch is built, so that the voltage change characteristic of the Y capacitance is observed and recorded, and the specific value of the Y capacitance is analyzed and calculated. However, the method is based on an important assumption that the method is limited and not easy to realize, and the important assumption is often not true, and meanwhile, the precision of the resistor and the accumulation of deviation have certain influence on the result of the Y capacitance, so that the detection accuracy is low.
In view of the above problems, no effective solution has been proposed at present.
Disclosure of Invention
The embodiment of the invention provides a capacitance detection method and device of a power battery, a storage medium and an electronic device, which at least solve the technical problems that the method is limited, the implementation is difficult and the detection accuracy is low because the Y capacitance detection is carried out on the power battery in an electric automobile on the basis of important assumption in the related technology.
According to one embodiment of the present invention, there is provided a capacitance detection method of a power battery, including: receiving a target control instruction, and according to a preset sequence, controlling the on state of a switch, determining a first voltage of a first resistor, a second voltage of a second resistor, a third voltage of a third resistor and a fourth voltage of a fourth resistor, wherein the first resistor, the second resistor, the third resistor and the fourth resistor are positioned outside a power battery, and the power battery comprises a target capacitor; determining a target capacitance value of a target capacitor according to the first voltage, the second voltage, the third voltage, the fourth voltage and the equivalent resistance value, wherein the equivalent resistance value is equivalent resistance values of a first resistor, a second resistor, a fifth resistor and a sixth resistor, and the power battery further comprises the fifth resistor and the sixth resistor; the target capacitance is detected based on the target capacitance value.
Optionally, determining the target capacitance value of the target capacitance according to the first voltage, the second voltage, the third voltage, the fourth voltage, and the equivalent resistance value includes: determining a first current according to the fifth voltage and the resistance value of the third resistor, and determining a second current according to the sixth voltage and the resistance value of the fourth resistor, wherein the first current is the current of the third resistor, the second current is the current of the fourth resistor, and the fifth voltage and the sixth voltage are transient voltages of the first resistor and the second resistor respectively; performing first deformation processing on the first current based on the equivalent resistance value, determining a first target current, and performing second deformation processing on the second current based on the equivalent resistance value, determining a second target current; processing the first target current based on the first voltage and the third voltage, determining the first target voltage, and processing the second target current based on the second voltage and the fourth voltage, determining the second target voltage; a target capacitance value is determined from the first target voltage and the second target voltage.
Optionally, processing the first target current based on the first voltage and the third voltage, determining the first target voltage, and processing the second target current based on the second voltage and the fourth voltage, determining the second target voltage includes: performing third deformation processing on the first current based on the first voltage and the third voltage to obtain a first initial voltage, and performing fourth deformation processing on the second current based on the second voltage and the fourth voltage to obtain a second initial voltage; and performing fifth deformation processing on the first initial voltage based on the first moment to obtain a first target voltage, and performing sixth deformation processing on the second initial voltage based on the second moment to obtain a second target voltage, wherein the first moment and the second moment are outside a preset time period after the initial moment.
Optionally, determining the target capacitance value from the first target voltage and the second target voltage comprises: and carrying out offset processing on the equivalent resistance value according to the first target voltage and the second target voltage to obtain a target capacitance value.
Optionally, the target control command includes a first control command, a second control command and a third control command, receiving the target control command, and controlling the on state of the switch according to a preset sequence, where determining the first voltage of the first resistor, the second voltage of the second resistor, the third voltage of the third resistor and the fourth voltage of the fourth resistor includes: a first control instruction is received, and a first voltage of a first resistor and a second voltage of a second resistor are determined, wherein the first control instruction is used for controlling the first switch, the second switch and the third switch to be conducted; a second control instruction is received, and a third voltage of a third resistor is determined, wherein the second control instruction is used for controlling the first switch, the second switch, the third switch and the fourth switch to be conducted, and the fourth switch is used for controlling the third resistor to be connected in parallel with the first resistor; and receiving a third control instruction, and determining a fourth voltage of a fourth resistor, wherein the second control instruction is used for controlling the first switch, the second switch, the third switch and the fifth switch to be conducted, and the fifth switch is used for controlling the fourth resistor to be connected in parallel with the second resistor.
Optionally, the method further comprises: determining the total voltage of the power battery; and responding to the fact that the difference value between the sum of the voltage of the first resistor and the voltage of the second resistor and the total voltage is larger than or equal to a first voltage threshold value, the voltage fluctuation of the first resistor is larger than or equal to a second voltage threshold value, and the voltage fluctuation of the second resistor is larger than or equal to a second voltage threshold value, and reporting error prompt information, wherein the error prompt information is used for representing detection flow errors.
According to an embodiment of the present invention, there is also provided a capacitance detection circuit of a power battery, including: the power battery comprises a battery, a fifth resistor, a sixth resistor and a target capacitor, wherein the positive electrode of the power battery is coupled with the first end of the first switch, the second end of the first switch is coupled with the first end of the first resistor, the second end of the first resistor is coupled with the first end of the third switch, the second end of the third switch is coupled with the ground end of the power battery, the first end of the first resistor is coupled with the first end of the fourth switch, the second end of the fourth switch is coupled with the first end of the third resistor, the second end of the third resistor is coupled with the first end of the third switch, the second end of the third resistor is coupled with the first end of the fourth resistor, the second end of the fourth resistor is coupled with the first end of the fifth switch, the second end of the fifth switch is coupled with the first end of the second switch, the second end of the second switch is coupled with the negative electrode of the power battery, the second end of the second switch is coupled with the first end of the second resistor, and the first end of the third resistor is coupled with the first end of the third resistor.
According to an embodiment of the present invention, there is also provided a capacitance detection device of a power battery, including: the control module is used for receiving a target control instruction, controlling the on state of the switch according to a preset sequence, determining the first voltage of the first resistor, the second voltage of the second resistor, the third voltage of the third resistor and the fourth voltage of the fourth resistor, wherein the first resistor, the second resistor, the third resistor and the fourth resistor are positioned outside the power battery, and the power battery comprises a target capacitor; the power battery comprises a first voltage, a second voltage, a third voltage, a fourth voltage and an equivalent resistance value, wherein the equivalent resistance value is equal to the equivalent resistance value of a first resistor, a second resistor, a fifth resistor and a sixth resistor; the detection module is used for detecting the target capacitance based on the target capacitance value.
Optionally, the determining module is further configured to determine a first current according to the fifth voltage and the resistance value of the third resistor, and determine a second current according to the sixth voltage and the resistance value of the fourth resistor, where the first current is the current of the third resistor, the second current is the current of the fourth resistor, and the fifth voltage and the sixth voltage are transient voltages of the first resistor and the second resistor respectively; performing first deformation processing on the first current based on the equivalent resistance value, determining a first target current, and performing second deformation processing on the second current based on the equivalent resistance value, determining a second target current; processing the first target current based on the first voltage and the third voltage, determining the first target voltage, and processing the second target current based on the second voltage and the fourth voltage, determining the second target voltage; a target capacitance value is determined from the first target voltage and the second target voltage.
Optionally, the determining module is further configured to perform a third deformation process on the first current based on the first voltage and the third voltage to obtain a first initial voltage, and perform a fourth deformation process on the second current based on the second voltage and the fourth voltage to obtain a second initial voltage; and performing fifth deformation processing on the first initial voltage based on the first moment to obtain a first target voltage, and performing sixth deformation processing on the second initial voltage based on the second moment to obtain a second target voltage, wherein the first moment and the second moment are outside a preset time period after the initial moment.
Optionally, the determining module is further configured to cancel the equivalent resistance value according to the first target voltage and the second target voltage to obtain the target capacitance value.
Optionally, the determining module is further configured to receive a first control instruction, determine a first voltage of the first resistor and a second voltage of the second resistor, where the first control instruction is used to control the first switch, the second switch, and the third switch to be turned on; a second control instruction is received, and a third voltage of a third resistor is determined, wherein the second control instruction is used for controlling the first switch, the second switch, the third switch and the fourth switch to be conducted, and the fourth switch is used for controlling the third resistor to be connected in parallel with the first resistor; and receiving a third control instruction, and determining a fourth voltage of a fourth resistor, wherein the second control instruction is used for controlling the first switch, the second switch, the third switch and the fifth switch to be conducted, and the fifth switch is used for controlling the fourth resistor to be connected in parallel with the second resistor.
Optionally, the detection module is further configured to determine a total voltage of the power battery; and responding to the fact that the difference value between the sum of the voltage of the first resistor and the voltage of the second resistor and the total voltage is larger than or equal to a first voltage threshold value, the voltage fluctuation of the first resistor is larger than or equal to a second voltage threshold value, and the voltage fluctuation of the second resistor is larger than or equal to a second voltage threshold value, and reporting error prompt information, wherein the error prompt information is used for representing detection flow errors.
According to one embodiment of the present invention, there is also provided a computer-readable storage medium in which a computer program is stored, wherein the computer program is configured to perform the capacitance detection method of the power battery in any one of the above when running on a computer or a processor.
According to one embodiment of the present invention, there is also provided an electronic device including a memory, in which a computer program is stored, and a processor configured to run the computer program to perform the method of detecting the capacitance of the power cell in any one of the above.
In the embodiment of the invention, the first voltage of the first resistor, the second voltage of the second resistor, the third voltage of the third resistor and the fourth voltage of the fourth resistor are determined by receiving the target control command and controlling the on state of the switch according to the preset sequence, wherein the first resistor, the second resistor, the third resistor and the fourth resistor are positioned outside the power battery, the power battery comprises a target capacitor, then the target capacitor value of the target capacitor is determined according to the first voltage, the second voltage, the third voltage, the fourth voltage and the equivalent resistor value, the equivalent resistor value is the equivalent resistor value of the first resistor, the second resistor, the fifth resistor and the sixth resistor, and finally the target capacitor is detected based on the target capacitor value, so that Y capacitor detection can be carried out on the premise of not needing important assumption, the Y capacitor detection is easy to realize, meanwhile, the accuracy and the deviation accumulation problem of each resistor are determined for a plurality of times according to the different on the on-state of the switch, the influence of the wire resistor and the contact resistor on the Y capacitor result is considered, the detection accuracy is easy to realize by the relevant technology, and the detection is not easy to realize on the fact that the detection of the Y capacitor is easy to be carried out by the relevant technology.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
FIG. 1 is a schematic circuit diagram of a method of detecting capacitance of a power cell;
FIG. 2 is a schematic circuit diagram of a method for detecting capacitance of a power cell according to one embodiment of the application;
FIG. 3 is a flow chart of a method of detecting capacitance of a power cell according to one embodiment of the application;
FIG. 4 is a schematic diagram of a Y-capacitance testing system according to one embodiment of the present application;
fig. 5 is a block diagram of a capacitance detection device of a power battery according to one embodiment of the present application.
Detailed Description
For ease of understanding, a description of some of the concepts related to the embodiments of the application are given by way of example for reference.
The following is shown:
the Y capacitance testing method for the RESS high-voltage assembly in the electric automobile comprises the following steps: the existing power battery Y capacitance test is mainly characterized in that a loop comprising a power battery, a Y capacitor, an insulation resistor, a balance resistor, a discharge resistor and a switch is built, the discharge resistor is connected into the test loop, the voltage change characteristic of the Y capacitor is observed and recorded, and the specific numerical value of the Y capacitor is analyzed and calculated.
FIG. 1 shows a power cell capacitance detection methodThe schematic circuit diagram of the method is shown in fig. 1, and the specific implementation process of the method is comprehensively described. The circuit of the power cell, Y capacitor (cy_ress), insulation resistor (riso_ress), balancing resistor (r_sys), discharging resistor (r_dis), switch is included in fig. 1. The positive electrode of the power battery is coupled with the first end of the switch, the second end of the switch is coupled with the first end of the discharging resistor (R_dis), the second end of the discharging resistor (R_dis) is grounded, and the first end of the switch is connected with the balance resistor (R_sys) + ) Is coupled to the first terminal of the balance resistor (R_sys + ) And a balancing resistor (R_sys) - ) Is coupled to the first terminal of the balance resistor (R_sys - ) Is coupled to the negative electrode of the power cell.
When the circuit schematic diagram in fig. 1 is in operation, the voltages of the balance resistor and the discharge resistor are determined by controlling the conduction state of the switch, and the voltage change characteristic of the Y capacitor is observed and recorded according to the determined voltages, so that the specific numerical value of the Y capacitor is analyzed and calculated.
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
According to one embodiment of the present invention, there is provided an embodiment of a method for detecting capacitance of a power battery, it being noted that the steps illustrated in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions, and that although a logical sequence is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in a different order than that illustrated herein.
The method embodiments may be performed in an electronic device, similar control device or system that includes a memory and a processor. Taking an electronic device as an example, the electronic device may include one or more processors and memory for storing data. Optionally, the electronic apparatus may further include a communication device for a communication function and a display device. It will be appreciated by those of ordinary skill in the art that the foregoing structural descriptions are merely illustrative and are not intended to limit the structure of the electronic device. For example, the electronic device may also include more or fewer components than the above structural description, or have a different configuration than the above structural description.
The processor may include one or more processing units. For example: the processor may include a processing device of a central processing unit (central processing unit, CPU), a graphics processor (graphics processing unit, GPU), a digital signal processing (digital signal processing, DSP) chip, a microprocessor (microcontroller unit, MCU), a programmable logic device (field-programmable gate array, FPGA), a neural network processor (neural-network processing unit, NPU), a tensor processor (tensor processing unit, TPU), an artificial intelligence (artificial intelligent, AI) type processor, or the like. Wherein the different processing units may be separate components or may be integrated in one or more processors. In some examples, the electronic device may also include one or more processors.
The memory may be used to store a computer program, for example, a computer program corresponding to the capacitance detection method of the power battery in the embodiment of the present invention, and the processor executes the computer program stored in the memory, thereby implementing the capacitance detection method of the power battery. The memory may include high speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid state memory. In some examples, the memory may further include memory remotely located with respect to the processor, which may be connected to the electronic device through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The communication device is used to receive or transmit data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider of the mobile terminal. In one example, the communication device includes a network adapter (network interface controller, NIC) that can connect to other network devices through the base station to communicate with the internet. In one example, the communication device may be a Radio Frequency (RF) module for communicating with the internet wirelessly.
Display devices may be, for example, touch screen type liquid crystal displays (liquid crystal display, LCDs) and touch displays (also referred to as "touch screens" or "touch display screens"). The liquid crystal display may enable a user to interact with a user interface of the mobile terminal. In some embodiments, the mobile terminal has a graphical user interface (graphical user interface, GUI) with which a user can interact with the GUI by touching finger contacts and/or gestures on the touch-sensitive surface, where the human-machine interaction functionality optionally includes the following interactions: executable instructions for performing the above-described human-machine interaction functions, such as creating web pages, drawing, word processing, making electronic documents, games, video conferencing, instant messaging, sending and receiving electronic mail, talking interfaces, playing digital video, playing digital music, and/or web browsing, are configured/stored in a computer program product or readable storage medium executable by one or more processors.
In this embodiment, there is provided a capacitance detection circuit of a power battery, including: the power battery comprises a battery, a fifth resistor, a sixth resistor and a target capacitor, wherein the positive electrode of the power battery is coupled with the first end of the first switch, the second end of the first switch is coupled with the first end of the first resistor, the second end of the first resistor is coupled with the first end of the third switch, the second end of the third switch is coupled with the ground end of the power battery, the first end of the first resistor is coupled with the first end of the fourth switch, the second end of the fourth switch is coupled with the first end of the third resistor, the second end of the third resistor is coupled with the first end of the third switch, the second end of the third resistor is coupled with the first end of the fourth resistor, the second end of the fourth resistor is coupled with the first end of the fifth switch, the second end of the fifth switch is coupled with the first end of the second switch, the second end of the second switch is coupled with the negative electrode of the power battery, the second end of the second switch is coupled with the first end of the second resistor, and the first end of the third resistor is coupled with the first end of the third resistor.
Fig. 2 is a schematic circuit diagram of a method for detecting capacitance of a power battery according to an embodiment of the present invention. As shown in fig. 2, the power battery in fig. 2 includes a battery (DC), a fifth resistor (riso_ress+), a sixth resistor (riso_ress-) and a target capacitor (Y capacitor cy_ress), a first switch (S1), a second switch (S2), a third switch (S3), a fourth switch (S4), a fifth switch (S5), a first resistor (R1), a second resistor (R2), a third resistor (R3) and a fourth resistor (R4).
The positive pole of the power battery is coupled with the first end of S1, the second end of S1 is coupled with the first end of R1, the second end of R1 is coupled with the first end of S3, the second end of S3 is coupled with the grounding end of the power battery, the first end of R1 is coupled with the first end of S4, the second end of S4 is coupled with the first end of R3, the second end of R3 is coupled with the first end of R4, the second end of R4 is coupled with the first end of S5, the second end of S5 is coupled with the first end of S2, the second end of S2 is coupled with the negative pole of the power battery, the second end of R1 is coupled with the first end of R2, the second end of R2 is coupled with the first end of S2, and the first end of S3 is grounded.
In this embodiment, a method for detecting a capacitance of a power battery operating in an electronic device is provided, and fig. 3 is a flowchart of a method for detecting a capacitance of a power battery according to one embodiment of the present invention, as shown in fig. 3, the flowchart includes the following steps:
Step S30, receiving a target control instruction, and controlling the on state of a switch according to a preset sequence to determine a first voltage of a first resistor, a second voltage of a second resistor, a third voltage of a third resistor and a fourth voltage of a fourth resistor;
the first resistor, the second resistor, the third resistor and the fourth resistor are located outside the power battery, and the power battery comprises a target capacitor.
The target control command may be understood as a command for controlling the on state of the switch, and the step may be understood as receiving a command for controlling the on state of the switch, and determining a first voltage of a first resistor, a second voltage of a second resistor, a third voltage of a third resistor, and a fourth voltage of a fourth resistor located outside the power battery according to a preset sequence of controlling the on state of the switch.
Alternatively, the specific process of this step may be implemented by the capacitance detection circuit of the power battery, as shown in fig. 2, where the first resistor may be understood as R1 in fig. 2, the first voltage of the first resistor may be understood as U1 in fig. 2, the second resistor may be understood as R2 in fig. 2, the second voltage of the second resistor may be understood as U2 in fig. 2, the third resistor may be understood as R3 in fig. 2, the third voltage of the third resistor may be understood as U1e, the fourth resistor may be understood as R4 in fig. 2, and the fourth voltage of the fourth resistor may be understood as U2 e.
Illustratively, an instruction for controlling the on-state of the switch is received, and the on-state of the switch is controlled according to a preset sequence, and U1, U2, U1e, and U2e located outside the power battery are determined.
It will be appreciated that when the circuit is dynamically changed, the voltage of the resistor will briefly fluctuate with the change of the current, the first voltage of the first resistor located outside the power battery may be understood as U1 of the circuit in the initial stable state R1, the second voltage of the second resistor may be understood as U2 of the circuit in the initial stable state R2, the third voltage of the third resistor may be understood as U1e of the circuit in the changed state R3, and the fourth voltage of the fourth resistor may be understood as U2e of the circuit in the changed state R4.
Optionally, when the target control command is to close the first switch, the second switch and the third switch, S1, S2 and S3 are all in a closed state, and the circuit is in an initial stable state, and at this time, the first voltage U1 of the first resistor and the second voltage U2 of the second resistor are determined. Specifically, U1 and U2 can be calculated by mathematical formulas, and the specific calculation process is as shown in the following formulas (1) - (2):
wherein U in the above formulas (1) - (2) 0 Representing the total voltage of the power battery when the switches are all opened, R + Representing the resistance of the positive electrode of the power battery to the ground, R - Represents the resistance of the power battery negative electrode to ground, wherein R + And R is - The specific expression of (2) is shown in the following formulas (3) to (4):
R + ＝R iso_RESS+ //R 1 (3)
R - ＝R iso_RESS- //R 2 (4)
wherein// in the above formulas (3) - (4) represents parallel connection.
Thereby, U1, U2 are determined, i.e. a first voltage of the first resistor and a second voltage of the second resistor are determined. After determining U1 and U2, controlling the fourth switch and the fifth switch, that is, controlling S4 or S5 to be in a closed state, and after the circuit is stable, determining U1 after the circuit is stable, that is, a third voltage U1e of the third resistor, and U2 after the circuit is stable, that is, a fourth voltage U2e of the fourth resistor.
Step S31, determining a target capacitance value of the target capacitor according to the first voltage, the second voltage, the third voltage, the fourth voltage and the equivalent resistance value;
the equivalent resistance values are equivalent resistance values of the first resistor, the second resistor, the fifth resistor and the sixth resistor, and the power battery further comprises the fifth resistor and the sixth resistor.
The target capacitance value may be understood as a capacitance value in the power cell, an equivalent resistance value of the first resistor, the second resistor, and the fifth resistor and the sixth resistor outside the power cell.
This step may be understood as determining the capacitance value within the power cell based on the first voltage, the second voltage, the third voltage, the fourth voltage, and the equivalent resistance values of the first resistor, the second resistor, and the five and sixth resistors within the power cell.
Step S32, detecting the target capacitance based on the target capacitance value.
This step may be understood as detecting the target capacitance based on the target capacitance value determined from the first voltage, the second voltage, the third voltage, the fourth voltage and the equivalent resistance value.
Optionally, the detection process of the whole target capacitor can be controlled by the upper computer, which is not limited in the embodiment of the invention.
Fig. 4 is a schematic structural diagram of a Y capacitance test system according to an embodiment of the present invention, as shown in fig. 4, in which fig. 4 includes a host computer, a 12V programmable power supply, a power battery Y capacitance test device and a measured RESS high voltage assembly, wherein the power battery Y capacitance test device can be understood as a circuit portion outside the power battery in fig. 2, and the measured RESS high voltage assembly can be understood as a measured power battery. The upper computer is used for controlling the whole power battery Y capacitance testing process, is connected with the programmable power supply through a communication interface and exchanges information, is connected with the communication interface of the power battery Y capacitance testing device and exchanges information, the 12V programmable power supply is used for outputting energy to the outside, is connected with the upper computer through the communication interface and is connected with the power battery Y capacitance testing device through a power output interface, the power battery Y capacitance testing device is used for realizing the power battery Y capacitance testing process, is respectively connected with the upper computer, the 12V programmable power supply and the tested RESS high-voltage assembly, and the tested RESS high-voltage assembly is used as a power battery Y capacitance testing object, is connected with the Y capacitance testing device and is typically represented as a power battery.
When the Y capacitance test system in FIG. 4 is operated, the whole power battery Y capacitance test process is controlled by the upper computer, energy is output to the outside through the 12V programmable power supply, the power battery Y capacitance test device is used for realizing the power battery Y capacitance test process, and the power battery Y capacitance test device is respectively connected with the upper computer, the 12V programmable power supply and the tested RESS high voltage assembly to perform Y capacitance test on the tested RESS high voltage assembly so as to finish detection of a target capacitance.
Through the steps, the first voltage of the first resistor, the second voltage of the second resistor, the third voltage of the third resistor and the fourth voltage of the fourth resistor are determined according to the preset sequence by receiving the target control command, wherein the first resistor, the second resistor, the third resistor and the fourth resistor are positioned outside the power battery, the power battery comprises a target capacitor, then the target capacitance value of the target capacitor is determined according to the first voltage, the second voltage, the third voltage, the fourth voltage and the equivalent resistance value, the equivalent resistance value is the equivalent resistance value of the first resistor, the second resistor, the fifth resistor and the sixth resistor, the power battery further comprises the fifth resistor and the sixth resistor, and finally the target capacitor is detected based on the target capacitance value, so that the Y capacitor detection can be carried out on the premise that important assumption is not needed, the Y capacitor detection is not limited by conditions, the method is easy to realize, meanwhile, the accuracy and the deviation accumulation problem of each resistor is determined for a plurality of times according to the difference of the conducting wire and the conducting state of the switch, the influence of the conducting wire and the contact resistor on the Y capacitor result is considered, the detection accuracy is high, the detection accuracy is easy to be achieved, the detection is not easy to be realized by the relevant power battery detection technology, and the important technology is not met, and the important problem is solved on the detection is solved.
Optionally, in step S31, determining the target capacitance value of the target capacitance according to the first voltage, the second voltage, the third voltage, the fourth voltage, and the equivalent resistance value may include performing the steps of:
step S310, determining a first current according to the fifth voltage and the resistance value of the third resistor, and determining a second current according to the sixth voltage and the resistance value of the fourth resistor;
the first current is the current of the third resistor, the second current is the current of the fourth resistor, and the fifth voltage and the sixth voltage are the transient voltages of the first resistor and the second resistor respectively.
The fifth voltage may be understood as the voltage of the first resistor at a certain moment in the process of current change in the circuit, the first current may be understood as the current flowing through the third resistor at a certain moment in the process of current change in the circuit, the sixth voltage may be understood as the voltage of the second resistor at a certain moment in the process of current change in the circuit, and the second current may be understood as the current flowing through the fourth resistor at a certain moment in the process of current change in the circuit.
Alternatively, the specific process of this step may be implemented by the capacitance detection circuit of the power battery, as shown in fig. 2, after the fourth switch S4 is closed, the current in the circuit changes, where the voltage of the first resistor at a certain moment in the process may be denoted as U1 (t), and the fifth voltage U R (t) can be expressed by a mathematical expression, and the specific form is shown in the following formula (5):
U R (t)＝U R1 (t)＝U 1 (t) (5)
after the fourth switch S4 is closed, the current in the circuit changes, and the voltage of the second resistor at a certain moment in the process can be represented as U2 (t), and the sixth voltage U R (t) can be expressed by a mathematical expression, and the specific form is shown in the following formula (6):
U R (t)＝U R2 (t)＝U 2 (t) (6)
current generation in circuitThe current flowing through the 1 st resistor at a certain time in the process can be expressed as I 1 (t)，I 1 (t) can be expressed by a mathematical expression, and the specific form is shown in the following formula (7):
I 1 (t)＝(U R1 (t))/(R1)＝U 1 (t)/R1 (7)
the current in the circuit changes, and the current flowing through the 1 st resistor at a certain moment in the process can be expressed as I 2 (t)，I 2 (t) can be expressed by a mathematical expression, and the specific form is shown in the following formula (8):
I 2 (t)＝(U R2 (t))/(R2)＝U 2 (t)/R2 (8)
the first current I (t) flowing through the third resistor at a certain moment in the course of the current change in the circuit after closing the fourth switch S4 can be expressed by a mathematical expression, and the specific form is as shown in the following formula (9):
I(t)＝U R1 /R 3 (9)
the second current I (t) flowing through the fourth resistor at a certain moment in the course of the current change in the circuit after closing the fifth switch S5 can be expressed by a mathematical expression, and the specific form is shown in the following formula (10):
I(t)＝U R2 /R 4 (10)
The first current and the second current are thus determined, and embodiments of the present invention are not limited.
Step S311, performing a first deformation process on the first current based on the equivalent resistance value, determining a first target current, and performing a second deformation process on the second current based on the equivalent resistance value, determining a second target current;
the first target current may be understood as a first current represented by an equivalent resistance value and the second target current may be understood as a second current represented by an equivalent resistance value.
Alternatively, the specific process of this step may be implemented by the capacitance detection circuit of the power battery, as shown in fig. 2, and after the fourth switch S4 is closedA first current flowing through the first resistor at a certain moment in the process of current change in the fixed circuit, and the equivalent resistance value is expressed as R i The first target current may be expressed by a mathematical expression, the specific form of which is shown in the following formula (11):
I(t)＝C y U 1 (t)e -t/RCy ＝C y U 1 e -t/(R3+Ri)Cy (11)
as shown in fig. 2, after the fourth switch S5 is closed, the equivalent resistance value is expressed as R after determining the second current flowing through the second resistor at a certain time during the current change in the circuit i The second target current may be expressed by a mathematical expression, in a specific form as shown in the following formula (12):
I(t)＝C y U 2 (t)e -t/RCy ＝C y U 1 e -t/(R4+Ri)Cy (12)
Wherein C in the above formulas (11) - (12) y Representing the voltage across the capacitor, when the current in the circuit changes, the voltage across the capacitor cy_ress+ at a certain moment can be represented by a mathematical expression, and the specific form is shown in the following formula (13):
U cy_RESS+ (t)＝Us(1-e -t/RC )＝U 1 (1-e -t/RC ) (13)
the voltage across the capacitor Cy_RESS at a certain moment can be expressed by a mathematical expression, and the specific form is shown in the following formula (14):
U cy_RESS- (t)＝Us(1-e -t/RC )＝U 2 (1-e -t/RC ) (14)
the capacitor cy_ress+ charging current at a certain moment can be expressed by a mathematical expression, and the specific form is as shown in the following formula (15):
I 1 (t)＝C y (du)/(dt)＝C y U 1 d(1-e -t/RC )/dt＝C y U 1 e -t/RCy (15)
the capacitance cy_ress-charging current at a certain moment can be expressed by a mathematical expression, and the specific form is shown in the following formula (16):
I 2 (t)＝C y (du)/(dt)＝C y U 2 d(1-e -t/RC )/dt＝C y U 2 e -t/RCy (16)
thus, the first target current and the second target current are determined, and the embodiment of the invention is not limited.
Step S312, processing the first target current based on the first voltage and the third voltage, determining the first target voltage, and processing the second target current based on the second voltage and the fourth voltage, determining the second target voltage;
alternatively, the specific process of this step may be implemented by the capacitance detection circuit of the power battery, as shown in fig. 2, after the fourth switch S4 is closed, the first current flowing through the first resistor at a certain moment in the process of current change in the circuit is determined, and the equivalent resistance value is expressed as R i Then the first target current U 1 (t 2) can be expressed by a mathematical expression, and the specific form is shown in the following formula (17):
U 1 (t2)＝(U 1 (t1)-U 1e )e t/(R3+Ri)Cy +U 1e (17)
second target current U 2 (t 2') can be expressed by a mathematical expression, and the specific form is shown in the following formula (18):
U 2 (t2’)＝(U 2 (t1’)-U 2e )e t/(R4+Ri)Cy +U 2e (18)
thus, the first target voltage and the second target voltage are determined, and embodiments of the present invention are not limited.
Step S313, determining a target capacitance value according to the first target voltage and the second target voltage.
After the first target voltage and the second target voltage are determined, a target capacitance value is determined according to the first target voltage and the second target voltage.
Alternatively, the target capacitance value Cy may be determined by calculation using a mathematical formula, the specific calculation being as shown in the following formula (19):
Cy＝((t 2 -t 1 )/(Cyln((U 1 (t 2 )-U 1e )/(U 1 (t 1 )-U 1e )))
-(t 2 ’-t 1 ’)/(ln((U 2 (t 2 ’)-U 2e )/
(U 2 (t 1 ’)-U 2e ))))/(R 3 -R 4 ) (19)
the target capacitance value is thus determined, and embodiments of the present invention are not limited.
Optionally, in step S312, processing the first target current based on the first voltage and the third voltage, determining the first target voltage, and processing the second target current based on the second voltage and the fourth voltage, determining the second target voltage may include performing the steps of:
step S3120, performing a third deformation process on the first current based on the first voltage and the third voltage to obtain a first initial voltage, and performing a fourth deformation process on the second current based on the second voltage and the fourth voltage to obtain a second initial voltage;
The first initial voltage may be understood as the voltage of the first resistor at a certain point in time after a current change in the circuit, the second initial voltage may be understood as the voltage of the second resistor at a certain point in time after a current change in the circuit,
alternatively, the specific process of this step may be implemented by the capacitance detection circuit of the power battery, as shown in fig. 2, after the fourth switch S4 is closed, the current in the circuit changes, and the first initial voltage U 1 (t) can be expressed by a mathematical expression, and the specific form is represented by the following formula (20):
U 1 (t)＝(U 1 -U 1e )e t(R3+Ri)Cy +U 1e (20)
after the fifth switch S5 is closed, the current in the circuit changes, the second initial voltage U 2 (t) can be expressed by a mathematical expression, and the specific form is represented by the following formula (21):
U 2 (t2)＝(U 2 -U 2e )e t/(R4+Ri)Cy +U 2e (21)
the first initial voltage and the second initial voltage are determined from this, and embodiments of the present invention are not limited.
Step S3121, performing a fifth deformation process on the first initial voltage based on the first time to obtain a first target voltage, and performing a sixth deformation process on the second initial voltage based on the second time to obtain a second target voltage.
Wherein the first time and the second time are outside a preset time period after the initial time.
It can be understood that when each voltage is determined, the selected time point and the determined voltage accuracy are in a functional curve relationship, the slope of the time earlier is large, the condition that the determined voltage accuracy is low due to instability of a circuit exists, therefore, the value of the time later is selected, the slope is small, the circuit is stable, and the determined voltage accuracy is high.
The initial time can be understood as the initial time of detecting the capacitance of the power battery, and the preset time period is used for guaranteeing that the accuracy of the voltage determined by the selected time point is higher, namely, when the voltage is determined by the selected point at a time outside the preset time period after the initial time, the circuit is more stable, and the accuracy of the determined voltage is higher.
Optionally, in step S313, determining the target capacitance value according to the first target voltage and the second target voltage may include performing the steps of:
in step S3130, the equivalent resistance value is offset according to the first target voltage and the second target voltage, so as to obtain a target capacitance value.
This step can be understood as a specific calculation process of the above formula (19), and will not be described herein.
Optionally, in step S31, the target control command includes a first control command, a second control command, and a third control command, the receiving the target control command, and determining the first voltage of the first resistor, the second voltage of the second resistor, the third voltage of the third resistor, and the fourth voltage of the fourth resistor according to the on state of the preset sequence control switch may include performing the steps of:
step S314, a first control instruction is received, and a first voltage of a first resistor and a second voltage of a second resistor are determined;
The first control instruction is used for controlling the first switch, the second switch and the third switch to be conducted.
Alternatively, the specific process of this step may be implemented by the capacitance detection circuit of the power battery, as shown in fig. 2, where the first control instruction may be understood as an instruction for controlling the first switch S1, the second switch S2, and the third switch S3 to be turned on, and after receiving the first control instruction, the steps S1, S2, and S3 are closed, and step 30 is performed to determine the first voltage of the first resistor and the second voltage of the second resistor.
Step S315, a second control instruction is received, and a third voltage of a third resistor is determined;
the second control instruction is used for controlling the first switch, the second switch, the third switch and the fourth switch to be conducted, and the fourth switch is used for controlling the third resistor to be connected with the first resistor in parallel.
Alternatively, the specific process of this step may be implemented by the capacitance detection circuit of the power battery, as shown in fig. 2, where the second control instruction may be understood as an instruction for controlling the first switch S1, the second switch S2, the third switch S3, and the fourth switch S4 to be turned on, and after receiving the first control instruction, the first control instruction is turned on, and the steps S1, S2, S3, and S4 are closed, and step 30 is performed to determine the third voltage of the third resistor.
Step S316, the third control command is received to determine the fourth voltage of the fourth resistor.
The second control instruction is used for controlling the first switch, the second switch, the third switch and the fifth switch to be conducted, and the fifth switch is used for controlling the fourth resistor to be connected with the second resistor in parallel.
Alternatively, the specific process of this step may be implemented by the capacitance detection circuit of the power battery, as shown in fig. 2, where the second control instruction may be understood as an instruction for controlling the first switch S1, the second switch S2, the third switch S3, and the fifth switch S5 to be turned on, and after receiving the first control instruction, the first control instruction is turned on, and the steps S1, S2, S3, and S5 are closed, to execute step 30, to determine the fourth voltage of the fourth resistor.
Optionally, in step S32, the method may further include the following steps:
step S320, determining the total voltage of the power battery;
alternatively, the specific process of this step may be implemented by the capacitance detection circuit of the power battery, as shown in fig. 2, where the total voltage of the power battery is the total voltage U of the power battery when the switches are all turned off 0 This step can be understood as continuously detecting the total voltage U of the power cell 0 Thus determining the total voltage of the power cell, embodiments of the present invention are not limited.
Step S321, reporting error prompt information in response to the difference value between the sum of the voltage of the first resistor and the voltage of the second resistor and the total voltage being greater than or equal to a first voltage threshold, the voltage fluctuation of the first resistor being greater than or equal to a second voltage threshold, and the voltage fluctuation of the second resistor being greater than or equal to a second voltage threshold.
The error prompt information is used for indicating detection flow errors.
The first voltage threshold may be understood as a maximum error value between the sum of the voltage of the first resistor and the voltage of the second resistor and the total voltage, that is, when the difference between the sum of the voltage of the first resistor and the voltage of the second resistor and the total voltage is greater than or equal to the first voltage threshold, the sum of the voltage of the first resistor and the voltage of the second resistor is greater than or equal to the total voltage, and the circuit is abnormal.
The second voltage threshold may be understood as a maximum value of an error range that allows voltage fluctuation to occur, that is, when the voltage fluctuation of the first resistor is equal to or greater than the second voltage threshold and the voltage fluctuation of the second resistor is equal to or greater than the second voltage threshold, the voltage fluctuation of the first resistor and the voltage fluctuation of the second resistor are indicated to be greater, and the normal detection process is affected.
The step can be understood that when the difference value between the sum of the voltage of the first resistor and the voltage of the second resistor and the total voltage is greater than or equal to a first voltage threshold, the voltage fluctuation of the first resistor is greater than or equal to a second voltage threshold, and the voltage fluctuation of the second resistor is greater than or equal to a second voltage threshold, the sum of the voltage of the first resistor and the voltage of the second resistor is greater than or equal to the total voltage, the circuit is abnormal, the voltage fluctuation of the first resistor and the voltage fluctuation of the second resistor are greater, the normal detection process is affected, and error prompt information for indicating the detection flow error is reported at the moment.
In an alternative embodiment, steps S320 to S321 may be performed each time the current in the circuit changes. For example, the specific procedure of this step may be implemented by the capacitance detection circuit of the power battery, as shown in fig. 2, where S1 is in a high voltage positive circuit, S2 is in a high voltage negative circuit, and S3 is in a housing ground circuit, it may be understood that, in consideration of ensuring safety, it may be preferable to take the steps of closing S3 first, checking the state of switch S3, closing S2 second, checking the state of switch S2, closing S31 last, checking the state of switch S1, and performing the detection of the circuit in steps S320 to S321 each time the circuit is changed, which is not limited in the embodiment of the present invention.
From the description of the above embodiments, it will be clear to a person skilled in the art that the method according to the above embodiments may be implemented by means of software plus the necessary general hardware platform, but of course also by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method according to the embodiments of the present invention.
The embodiment also provides a device for detecting the capacitance of the power battery, which is used for realizing the above embodiment and the preferred implementation, and is not described again. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.
Fig. 5 is a block diagram of a power cell capacitance detection device according to an embodiment of the present invention, and as shown in fig. 5, a power cell capacitance detection device 500 is exemplified, and the device includes: the control module 501 is configured to receive a target control instruction, control the on state of the switch according to a preset sequence, and determine a first voltage of the first resistor, a second voltage of the second resistor, a third voltage of the third resistor, and a fourth voltage of the fourth resistor, where the first resistor, the second resistor, the third resistor, and the fourth resistor are located outside the power battery, and the power battery includes a target capacitor; the determining module 502 is configured to determine a target capacitance value of the target capacitor according to the first voltage, the second voltage, the third voltage, the fourth voltage, and an equivalent resistance value, where the equivalent resistance value is an equivalent resistance value of the first resistor, the second resistor, the fifth resistor, and the sixth resistor, and the power battery further includes the fifth resistor and the sixth resistor; the detection module 503, the detection module 503 is configured to detect the target capacitance based on the target capacitance value.
Optionally, the determining module 502 is further configured to determine a first current according to the fifth voltage and the resistance value of the third resistor, and determine a second current according to the sixth voltage and the resistance value of the fourth resistor, where the first current is the current of the third resistor, the second current is the current of the fourth resistor, and the fifth voltage and the sixth voltage are transient voltages of the first resistor and the second resistor respectively; performing first deformation processing on the first current based on the equivalent resistance value, determining a first target current, and performing second deformation processing on the second current based on the equivalent resistance value, determining a second target current; processing the first target current based on the first voltage and the third voltage, determining the first target voltage, and processing the second target current based on the second voltage and the fourth voltage, determining the second target voltage; a target capacitance value is determined from the first target voltage and the second target voltage.
Optionally, the determining module 502 is further configured to perform a third deformation process on the first current based on the first voltage and the third voltage to obtain a first initial voltage, and perform a fourth deformation process on the second current based on the second voltage and the fourth voltage to obtain a second initial voltage; and performing fifth deformation processing on the first initial voltage based on the first moment to obtain a first target voltage, and performing sixth deformation processing on the second initial voltage based on the second moment to obtain a second target voltage, wherein the first moment and the second moment are outside a preset time period after the initial moment.
Optionally, the determining module 502 is further configured to cancel the equivalent resistance value according to the first target voltage and the second target voltage to obtain the target capacitance value.
Optionally, the determining module 502 is further configured to receive a first control instruction, determine a first voltage of the first resistor and a second voltage of the second resistor, where the first control instruction is used to control the first switch, the second switch, and the third switch to be turned on; a second control instruction is received, and a third voltage of a third resistor is determined, wherein the second control instruction is used for controlling the first switch, the second switch, the third switch and the fourth switch to be conducted, and the fourth switch is used for controlling the third resistor to be connected in parallel with the first resistor; and receiving a third control instruction, and determining a fourth voltage of a fourth resistor, wherein the second control instruction is used for controlling the first switch, the second switch, the third switch and the fifth switch to be conducted, and the fifth switch is used for controlling the fourth resistor to be connected in parallel with the second resistor.
Optionally, the detection module 503 is further configured to determine a total voltage of the power battery; and responding to the fact that the difference value between the sum of the voltage of the first resistor and the voltage of the second resistor and the total voltage is larger than or equal to a first voltage threshold value, the voltage fluctuation of the first resistor is larger than or equal to a second voltage threshold value, and the voltage fluctuation of the second resistor is larger than or equal to a second voltage threshold value, and reporting error prompt information, wherein the error prompt information is used for representing detection flow errors.
It should be noted that each of the above modules may be implemented by software or hardware, and for the latter, it may be implemented by, but not limited to: the modules are all located in the same processor; alternatively, the above modules may be located in different processors in any combination.
Embodiments of the present invention also provide a computer readable storage medium having a computer program stored therein, wherein the computer program is arranged to perform the steps of any of the method embodiments described above when run on a computer or processor.
Alternatively, in the present embodiment, the above-described computer-readable storage medium may be configured to store a computer program for performing the steps of:
step S1, receiving a target control instruction, and controlling the on state of a switch according to a preset sequence to determine a first voltage of a first resistor, a second voltage of a second resistor, a third voltage of a third resistor and a fourth voltage of a fourth resistor;
step S2, determining a target capacitance value of the target capacitor according to the first voltage, the second voltage, the third voltage, the fourth voltage and the equivalent resistance value;
and step S3, detecting the target capacitance based on the target capacitance value.
Alternatively, in the present embodiment, the above-described computer-readable storage medium may include, but is not limited to: a usb disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a removable hard disk, a magnetic disk, or an optical disk, or other various media in which a computer program can be stored.
An embodiment of the invention also provides an electronic device comprising a memory in which a computer program is stored and a processor arranged to run the computer program to perform the steps of any of the method embodiments described above.
Alternatively, in the present embodiment, the processor in the electronic device may be configured to execute the computer program to perform the steps of:
step S1, receiving a target control instruction, and controlling the on state of a switch according to a preset sequence to determine a first voltage of a first resistor, a second voltage of a second resistor, a third voltage of a third resistor and a fourth voltage of a fourth resistor;
step S2, determining a target capacitance value of the target capacitor according to the first voltage, the second voltage, the third voltage, the fourth voltage and the equivalent resistance value;
and step S3, detecting the target capacitance based on the target capacitance value.
Alternatively, specific examples in this embodiment may refer to examples described in the foregoing embodiments and optional implementations, and this embodiment is not described herein.
The foregoing embodiment numbers of the present application are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
In the foregoing embodiments of the present application, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed technology may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, for example, may be a logic function division, and may be implemented in another manner, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.

Claims (10)

1. A method for detecting capacitance of a power battery, comprising:
receiving a target control instruction, and according to a preset sequence, controlling the on state of a switch, determining a first voltage of a first resistor, a second voltage of a second resistor, a third voltage of a third resistor and a fourth voltage of a fourth resistor, wherein the first resistor, the second resistor, the third resistor and the fourth resistor are positioned outside a power battery, and the power battery comprises a target capacitor;
determining a target capacitance value of the target capacitance according to the first voltage, the second voltage, the third voltage, the fourth voltage and an equivalent resistance value, wherein the equivalent resistance value is an equivalent resistance value of the first resistor, the second resistor, a fifth resistor and a sixth resistor, and the power battery further comprises the fifth resistor and the sixth resistor;
And detecting the target capacitance based on the target capacitance value.
2. The method of claim 1, wherein the determining the target capacitance value of the target capacitance from the first voltage, the second voltage, the third voltage, the fourth voltage, and an equivalent resistance value comprises:
determining a first current according to a fifth voltage and a resistance value of the third resistor, and determining a second current according to a sixth voltage and a resistance value of the fourth resistor, wherein the first current is a current of the third resistor, the second current is a current of the fourth resistor, and the fifth voltage and the sixth voltage are transient voltages of the first resistor and the second resistor respectively;
performing first deformation processing on the first current based on the equivalent resistance value, determining a first target current, and performing second deformation processing on the second current based on the equivalent resistance value, determining a second target current;
processing the first target current based on the first voltage and the third voltage, determining a first target voltage, and processing the second target current based on the second voltage and the fourth voltage, determining a second target voltage;
And determining the target capacitance value according to the first target voltage and the second target voltage.
3. The method of claim 2, wherein the processing the first target current based on the first voltage and the third voltage, determining a first target voltage, and processing the second target current based on the second voltage and the fourth voltage, determining a second target voltage comprises:
performing third deformation processing on the first current based on the first voltage and the third voltage to obtain a first initial voltage, and performing fourth deformation processing on the second current based on the second voltage and the fourth voltage to obtain a second initial voltage;
and performing fifth deformation processing on the first initial voltage based on a first moment to obtain the first target voltage, and performing sixth deformation processing on the second initial voltage based on a second moment to obtain the second target voltage, wherein the first moment and the second moment are outside a preset time period after the initial moment.
4. The method of claim 2, wherein the determining the target capacitance value from the first target voltage and the second target voltage comprises:
And carrying out offset processing on the equivalent resistance value according to the first target voltage and the second target voltage to obtain the target capacitance value.
5. The method of claim 1, wherein the target control command comprises a first control command, a second control command, and a third control command, wherein the receiving the target control command, controlling the on state of the switch according to a preset sequence, and determining the first voltage of the first resistor, the second voltage of the second resistor, the third voltage of the third resistor, and the fourth voltage of the fourth resistor comprises:
the first control instruction is received, the first voltage of the first resistor and the second voltage of the second resistor are determined, and the first control instruction is used for controlling the first switch, the second switch and the third switch to be conducted;
the second control instruction is received, the third voltage of the third resistor is determined, wherein the second control instruction is used for controlling the first switch, the second switch, the third switch and the fourth switch to be conducted, and the fourth switch is used for controlling the third resistor to be connected in parallel with the first resistor;
and receiving the third control instruction, and determining the fourth voltage of the fourth resistor, wherein the second control instruction is used for controlling the first switch, the second switch, the third switch and a fifth switch to be conducted, and the fifth switch is used for controlling the fourth resistor to be connected in parallel with the second resistor.
6. The method of any one of claims 1-5, further comprising:
determining a total voltage of the power cells;
and responding to the fact that the difference value between the sum of the voltage of the first resistor and the voltage of the second resistor and the total voltage is larger than or equal to a first voltage threshold, the voltage fluctuation of the first resistor is larger than or equal to a second voltage threshold, and the voltage fluctuation of the second resistor is larger than or equal to the second voltage threshold, and reporting error prompt information, wherein the error prompt information is used for representing detection flow errors.
7. A capacitance detection circuit of a power battery, comprising: a power battery, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a first resistor, a second resistor, a third resistor and a fourth resistor, wherein the power battery comprises a battery, a fifth resistor, a sixth resistor and a target capacitor,
the positive electrode of the power battery is coupled with the first end of the first switch, the second end of the first switch is coupled with the first end of the first resistor, the second end of the first resistor is coupled with the first end of the third switch, the second end of the third switch is coupled with the grounding end of the power battery,
A first end of the first resistor is coupled to a first end of the fourth switch, a second end of the fourth switch is coupled to a first end of the third resistor, a second end of the third resistor is coupled to a first end of the third switch,
the second end of the third resistor is coupled with the first end of the fourth resistor, the second end of the fourth resistor is coupled with the first end of the fifth switch, the second end of the fifth switch is coupled with the first end of the second switch, the second end of the second switch is coupled with the negative electrode of the power battery,
the second end of the first resistor is coupled with the first end of the second resistor, the second end of the second resistor is coupled with the first end of the second switch, and the first end of the third switch is grounded.
8. A capacitance detection device of a power battery, comprising:
the control module is used for receiving a target control instruction, controlling the on state of the switch according to a preset sequence, and determining a first voltage of a first resistor, a second voltage of a second resistor, a third voltage of a third resistor and a fourth voltage of a fourth resistor, wherein the first resistor, the second resistor, the third resistor and the fourth resistor are positioned outside the power battery, and the power battery comprises a target capacitor;
The determining module is used for determining a target capacitance value of the target capacitance according to the first voltage, the second voltage, the third voltage, the fourth voltage and an equivalent resistance value, wherein the equivalent resistance value is an equivalent resistance value of the first resistor, the second resistor, a fifth resistor and a sixth resistor, and the power battery further comprises the fifth resistor and the sixth resistor;
and the detection module is used for detecting the target capacitance based on the target capacitance value.
9. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein a computer program, wherein the computer program is arranged to perform the method of capacitance detection of a power cell as claimed in any of the preceding claims 1 to 6 when run on a computer or processor.
10. An electronic device comprising a memory and a processor, characterized in that the memory has stored therein a computer program, the processor being arranged to run the computer program to perform the method of capacitance detection of a power cell as claimed in any of the preceding claims 1 to 6.
CN202310574557.5A 2023-05-19 2023-05-19 Method and device for detecting capacitance of power battery, storage medium and electronic device Pending CN116577565A (en)

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CN202310574557.5A CN116577565A (en) 2023-05-19 2023-05-19 Method and device for detecting capacitance of power battery, storage medium and electronic device

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CN202310574557.5A CN116577565A (en) 2023-05-19 2023-05-19 Method and device for detecting capacitance of power battery, storage medium and electronic device

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