CN115692888A - Battery management system and method and device for acquiring cell impedance - Google Patents
Battery management system and method and device for acquiring cell impedance Download PDFInfo
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Abstract
The invention discloses a battery management system and a method and a device for acquiring cell impedance, wherein the system comprises: the system comprises at least one battery cell module, a daisy chain communication module and a control module; the battery cell module comprises a functional element and is used for measuring a battery cell impedance value; the control module is used for receiving the cell impedance measurement signal and sending the cell impedance measurement signal to the daisy chain communication module; the daisy chain communication module converts the cell impedance measurement signal into a daisy chain differential signal and sends the daisy chain differential signal to the cell module; the battery cell module inputs the battery cell impedance value to the control module through the daisy chain differential signal. The invention integrates the functional element with the cell impedance measurement, simplifies the peripheral circuit, can monitor the impedance of each cell in real time in the whole service cycle of the system, and improves the safety of the system; the battery core with the abnormal impedance can be replaced and maintained in time, and the reliability of the system is improved.
Description
Technical Field
The invention relates to the technical field of battery management, in particular to a battery management system and a method and a device for acquiring battery core impedance.
Background
The internal resistance of the battery cell is an important technical index for measuring the performance of the battery cell and is an important factor influencing the charge and discharge characteristics and efficiency of the battery cell. At present, in new energy vehicles and energy storage system applications, through the combination of a plurality of battery cells in series and parallel connection, the internal resistance change of the battery cells directly influences the performance of the whole system. Eventually causing the entire battery module to fail. In order to avoid the occurrence of such imbalance, when a plurality of battery cells are combined into a battery pack, internal resistance measurement and matching are performed to make the internal resistances of the battery cells in the same battery pack as close as possible. The current technology carries out internal resistance measurement and stepping before the electric core is assembled, and impedance measurement and monitoring in the electric core are difficult to realize in the use after the electric core is assembled.
Disclosure of Invention
In view of this, embodiments of the present invention provide a battery management system, and a method and an apparatus for obtaining a cell impedance, so as to solve a technical problem in the prior art that it is difficult to measure and monitor a cell impedance during a use process after cells are grouped.
The technical scheme provided by the invention is as follows:
in a first aspect, an embodiment of the present invention provides a battery management system, where the battery management system includes: the system comprises at least one battery cell module, a daisy chain communication module and a control module, wherein one end of the daisy chain communication module is connected with the control module through a serial peripheral interface, the other end of the daisy chain communication module is connected with the battery cell modules, and the battery cell modules are connected in a daisy chain communication mode; the cell module comprises a functional element, and the functional element is used for measuring a cell impedance value; the control module is used for receiving the cell impedance measurement signal and sending the cell impedance measurement signal to the daisy chain communication module through the serial peripheral interface; the daisy chain communication module converts the cell impedance measurement signals into daisy chain differential signals and sends the daisy chain differential signals to the cell modules; the battery cell module inputs the battery cell impedance value to the control module through the daisy chain differential signal.
With reference to the first aspect, in a possible implementation manner of the first aspect, the inputting, by the cell module, the cell impedance value to the control module through the daisy-chain differential signal includes: the battery cell module inputs the battery cell impedance value to the daisy chain communication module through the daisy chain differential signal; the daisy chain communication module converts the daisy chain differential signal into a standard serial peripheral interface signal, and the standard serial peripheral interface signal includes the cell impedance value.
With reference to the first aspect, in another possible implementation manner of the first aspect, the system further includes: the upper computer is used for sending the cell impedance measurement signal to the communication module; the communication module is connected with the control module and used for sending the electric core impedance measurement signal to the control module.
With reference to the first aspect, in yet another possible implementation manner of the first aspect, the system further includes: and the power supply is respectively connected with the communication module and the control module and used for supplying power.
With reference to the first aspect, in yet another possible implementation manner of the first aspect, the functional element is further configured to acquire cell voltage data and cell temperature data.
In a second aspect, an embodiment of the present invention provides a method for obtaining a cell impedance, where the method is used in the battery management system according to any one of the first aspect and the first aspect of the embodiment of the present invention; the method for acquiring the cell impedance comprises the following steps: a control module in the battery management system receives a cell impedance measurement signal and sends the cell impedance measurement signal to a daisy chain communication module in the battery management system; the daisy chain communication module converts the cell impedance measurement signal into a daisy chain differential signal and sends the daisy chain differential signal to a cell module in the battery management system; functional elements in the battery cell module measure battery cell impedance values, and the battery cell impedance values are input to the control module through the daisy chain differential signals; and the control module sends the cell impedance value to an upper computer through a communication module in the battery management system.
With reference to the second aspect, in a possible implementation manner of the second aspect, the inputting the cell impedance value to the control module through the daisy-chain differential signal includes: the battery cell module inputs the battery cell impedance value to the daisy chain communication module through the daisy chain differential signal; the daisy chain communication module converts the daisy chain differential signal into a standard serial peripheral interface signal, and inputs the standard serial peripheral interface signal to the control module, wherein the standard serial peripheral interface signal comprises the cell impedance value.
In a third aspect, an embodiment of the present invention provides a device for acquiring a cell impedance, where the device is used in the battery management system according to any one of the first aspect and the first aspect of the embodiment of the present invention; this acquire device of electric core impedance includes: the receiving module is used for receiving the battery core impedance measuring signal by the control module in the battery management system and sending the battery core impedance measuring signal to the daisy chain communication module in the battery management system; the conversion module and the sending module are used for converting the cell impedance measurement signal into a daisy chain differential signal by the daisy chain communication module and sending the daisy chain differential signal to the cell module in the battery management system; the measurement and transmission module is used for measuring a cell impedance value of a functional element in the cell module and inputting the cell impedance value to the control module through the daisy chain differential signal; and the sending module is used for sending the battery core impedance value to an upper computer by the control module through a communication module in the battery management system.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, where computer instructions are stored, and the computer instructions are configured to cause the computer to execute the method for obtaining a cell impedance according to any one of the second aspect and the second aspect of the embodiments of the present invention.
In a fifth aspect, an embodiment of the present invention provides an electronic device, including: the memory and the processor are connected in communication with each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the method for obtaining the cell impedance according to any one of the second aspect and the second aspect of the embodiments of the present invention.
The technical scheme provided by the invention has the following effects:
the battery management system provided by the embodiment of the invention integrates the functional element with the cell impedance measurement function, simplifies the peripheral circuit, can monitor the impedance of each cell in real time in the whole service cycle of the system, and improves the safety of the system; the battery core with the abnormal impedance can be replaced and maintained in time, and the reliability of the system is improved.
The method for obtaining the cell impedance provided by the embodiment of the invention is applied to a battery management system integrated with a cell impedance measurement function, can directly obtain the corresponding cell impedance value, and improves the efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a block diagram illustrating a battery management system according to an embodiment of the present invention;
fig. 2 is an electrical schematic diagram of a cell module provided according to an embodiment of the present invention;
FIG. 3 is a block diagram of a battery management system composed of DNB110xA chips according to an embodiment of the present invention;
fig. 4 is a flowchart of a method for obtaining cell impedance according to an embodiment of the present invention;
fig. 5 is a block diagram of a device for obtaining cell impedance according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a computer-readable storage medium provided according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The internal resistance of the battery cell is an important technical index for measuring the performance of the battery cell and is an important factor influencing the charge and discharge characteristics and efficiency of the battery cell. The prior art carries out internal resistance measurement and stepping before the electric core is assembled, and the measurement and the control of electric core internal resistance are difficult to realize in the use after electric core is in groups.
The embodiment of the invention provides a battery management system, which can realize impedance measurement of each battery cell in a system use period.
As shown in fig. 1, the battery management system 1 includes: at least one cell module 11, a daisy chain communication module 12 and a control module 13.
One end of the daisy chain communication module 12 is connected with the control module 13 through a serial peripheral interface, the other end is connected with the battery cell modules 11, and each battery cell module 11 is connected with the other end in a daisy chain communication manner.
Further, the cell module 11 includes a functional element 111, and the functional element 111 is integrated with a cell impedance measurement function, and is used for measuring a cell impedance value. In the embodiment of the present invention, the functional element 111 is a single core management chip DNB110xA.
Specifically, after the control module 13 receives the cell impedance measurement signal, the cell impedance measurement signal is sent to the daisy chain communication module 12 connected thereto through a Serial Peripheral Interface (SPI);
since the cell impedance measurement signal is a standard SPI signal, the daisy chain communication module 12 can convert the cell impedance measurement signal into a daisy chain differential signal, facilitate connection with a subsequent circuit (cell module connection circuit), and transmit the daisy chain differential signal to the cell module 11.
After receiving the daisy chain differential signal, the cell module 11 measures the cell impedance value by using the functional element 111, and transmits the measured cell impedance value back to the control module 13 by using the daisy chain differential signal.
An electrical schematic diagram of the cell module 11 is shown in fig. 2, where U1 represents a functional element and is integrated with a cell impedance measurement function.
Specifically, the impedance measurement is based on the external current source of the switch Q1 and the resistor R1 for forcing a current through the cell at a specified frequency, and the IC (U1) measures the impedance at this frequency, and the measurement frequency setting formula is shown in the following relation (1):
F measurement ＝k×M×2 E (1)
in the formula: k =7.45mHz; m represents a frequency multiplier; e represents a frequency index;
wherein, M and E can be set by the IC (U1) frequency register. And measuring the impedance of the battery cell under different frequencies by setting different parameters.
Further, the IC (U1) applies current excitation with specific frequency to the positive electrode and the negative electrode of the battery cell, and alternating current voltage with corresponding frequency is generated at the two ends of the battery cell. The IC (U1) measures the impedance of the cell at this frequency.
Further, the impedance measurements are stored in two separate registers, one for storing the real part of the impedance data (Z) real ) One to store the imaginary impedance (Zimag). Each result is 16 bits wide and consists of a 4-bit exponent (E) RE And E IM Representing the real and imaginary parts, respectively) and 12-bit mantissas (two's complement representation, M) RE And M IM Representing the real and imaginary parts, respectively) components.
Specifically, the actual value of the impedance measurement is converted by the following relations (2) and (3):
real part of impedance measurement:
impedance measurement imaginary part:
known cell voltage V ZM 、Z real 、Z imag Thereafter, the impedance is calculated using the following relationships (4) and (5):
impedance real part conversion:
impedance imaginary part conversion:
in the formula: ext represents the in-circuit resistance R1; k =1.41 · 10 8 ；f exc Represents the excitation frequency; sin c (x) = sin (π x)/π x.
The battery management system provided by the embodiment of the invention integrates the functional element with the cell impedance measurement function, simplifies the peripheral circuit, can monitor the impedance of each cell in real time in the whole service cycle of the system, and improves the safety of the system; the battery core with abnormal impedance can be replaced and maintained in time, and the reliability of the system is improved.
As an optional implementation manner of the embodiment of the present invention, when the battery cell module 11 inputs the battery cell impedance value to the control module 13 through the daisy chain differential signal, first, the battery cell module 11 inputs the battery cell impedance value to the daisy chain communication module 12 through the daisy chain differential signal; next, the daisy chain communication module 12 converts the daisy chain differential signal into a standard serial peripheral interface signal, and inputs the standard serial peripheral interface signal to the control module 13.
Further, since the standard serial peripheral interface signal carries the cell impedance value, the control module 13 may obtain the cell impedance value from the standard serial peripheral interface signal.
As an optional implementation manner of the embodiment of the present invention, the battery management system 1 further includes: an upper computer 14 and a communication module 15.
The upper computer 14 is configured to send a cell impedance measurement signal to the communication module 15; the communication module is used for interaction of external data information, CAN be CAN communication or RS485 communication, and the invention is not particularly limited to this, as long as the communication condition is met.
Specifically, the communication module 15 is connected to the control module 13, and is configured to send the cell impedance measurement signal to the control module 13.
As an optional implementation manner of the embodiment of the present invention, the battery management system 1 further includes: and the power supply 16 is respectively connected with the communication module 15 and the control module 13 and used for supplying power.
As an optional implementation manner of the embodiment of the present invention, the functional element 111 may further acquire cell voltage data and cell temperature data, and transmit the data to the control module. The specific transmission process is the same as the transmission process of the cell impedance value, and is not described herein again.
In an example, a battery management system composed of DNB110xA chips is provided, and a maximum of 252 cells can be connected in series, wherein the DNB110xA chip has functions of cell voltage acquisition, cell temperature acquisition and cell impedance measurement, so that the battery management system composed of DNB110xA chips is a highly integrated battery management system.
As shown in fig. 3, includes:
(1) a power supply module: and power is supplied to the MCU and the communication module.
(2) MCU: the MCU is connected with the communication module to communicate with the outside to perform data interaction; and communicating with the SPI-to-daisy chain module, and receiving voltage data, temperature data and impedance data of each battery cell.
(3) A communication module: the communication module is mainly used for interaction of external data information, and CAN be CAN communication or RS485 communication, but not limited to the two types of communication.
(4) SPI changes the module of the daisy chain: the module mainly converts standard SPI signals into daisy chain differential signals, an SPI communication interface can be conveniently electrically connected and communicated with an MCU, and the daisy chain differential signals are conveniently connected with a rear-stage circuit.
(5) 1# cell: the battery cell is a module integrated with a DNB110xA chip, and the module can acquire data such as voltage, temperature and battery cell impedance of the battery cell.
The modules (6), (7), (8) and (9) have the same composition structure as the 1# battery cell, and daisy chain communication is adopted between the modules.
An embodiment of the present invention further provides a method for obtaining a cell impedance, as shown in fig. 4, the method includes the following steps:
step 201: and the control module in the battery management system receives the cell impedance measurement signal and sends the cell impedance measurement signal to the daisy chain communication module in the battery management system.
For a specific implementation process, reference is made to the above description of the communication process of the control module 13 and the daisy chain communication module 12 in the battery management system 1, and details are not described here again.
Step 202: the daisy chain communication module converts the cell impedance measurement signal into a daisy chain differential signal and sends the daisy chain differential signal to the cell modules in the battery management system.
For a specific implementation process, reference is made to the above description of related functions of the daisy chain communication module 12 in the battery management system 1 and the description of a communication process between the battery cell module 11 and the daisy chain communication module 12, which is not described herein again.
Step 203: and functional elements in the battery cell module measure battery cell impedance values, and the battery cell impedance values are input to the control module through the daisy chain differential signals.
For a specific implementation process, reference is made to the above description of functions related to the battery cell module 11 and the functional element 111 in the battery management system 1, and a description of a communication process between the daisy chain communication module 12 and the control module 13, which is not described herein again.
Step 204: and the control module sends the cell impedance value to an upper computer through a communication module in the battery management system.
For a specific implementation process, reference is made to the above description of a communication process among the control module 13, the communication module 15 and the upper computer 14 in the battery management system 1, and details are not repeated here.
The method for obtaining the cell impedance provided by the embodiment of the invention is applied to a battery management system integrated with a cell impedance measurement function, can directly obtain the corresponding cell impedance value, and improves the efficiency.
As an optional implementation manner of the embodiment of the present invention, inputting the battery cell impedance value to the control module through the daisy chain differential signal includes: the battery cell module inputs the battery cell impedance value to the daisy chain communication module through the daisy chain differential signal; the daisy chain communication module converts the daisy chain differential signal into a standard serial peripheral interface signal, and inputs the standard serial peripheral interface signal to the control module, wherein the standard serial peripheral interface signal comprises the cell impedance value.
In a specific implementation process, reference is made to the description of "the battery cell module inputs the battery cell impedance value to the control module through the daisy chain differential signal", which is not described herein again.
An embodiment of the present invention further provides a device for acquiring electrical core impedance, and as shown in fig. 5, the device includes:
a receiving module 501, configured to receive a cell impedance measurement signal by a control module in the battery management system, and send the cell impedance measurement signal to a daisy chain communication module in the battery management system; for details, reference is made to the description relating to step 201 in the above method embodiment.
A conversion module and transmission module 502, configured to convert the cell impedance measurement signal into a daisy chain differential signal by the daisy chain communication module, and transmit the daisy chain differential signal to a cell module in the battery management system; for details, reference is made to the description relating to step 202 in the above-described method embodiment.
A measurement and transmission module 503, configured to measure a cell impedance value of a functional element in the cell module, and input the cell impedance value to the control module through the daisy chain differential signal; see the description above regarding step 203 in the method embodiment for details.
A sending module 504, configured to send the cell impedance value to an upper computer through a communication module in the battery management system by the control module; see the above description of step 204 in the method embodiment for details.
The device for acquiring the cell impedance provided by the embodiment of the invention is applied to a battery management system integrated with a cell impedance measurement function, can directly acquire a corresponding cell impedance value, and improves the efficiency.
As an optional implementation manner of the embodiment of the present invention, the measuring and sending module includes: the first input sub-module is used for inputting the cell impedance value to the daisy chain communication module through the daisy chain differential signal by the cell module; and the second input sub-module is used for converting the daisy chain differential signal into a standard serial peripheral interface signal by the daisy chain communication module and inputting the standard serial peripheral interface signal to the control module, wherein the standard serial peripheral interface signal comprises the cell impedance value.
For a detailed description of the functions of the apparatus for acquiring a cell impedance provided in the embodiment of the present invention, reference is made to the description of the method for acquiring a cell impedance in the foregoing embodiment.
An embodiment of the present invention further provides a storage medium, as shown in fig. 6, where a computer program 601 is stored on the storage medium, and when executed by a processor, the instructions implement the steps of the method for obtaining the cell impedance in the foregoing embodiment. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, HDD), a Solid-State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, HDD), a Solid-State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
An embodiment of the present invention further provides an electronic device, as shown in fig. 7, the electronic device may include a processor 71 and a memory 72, where the processor 71 and the memory 72 may be connected by a bus or in another manner, and fig. 7 takes the connection by the bus as an example.
The processor 71 may be a Central Processing Unit (CPU). The Processor 71 may also be other general purpose processors, digital Signal Processors (DSPs), application Specific Integrated Circuits (ASICs), field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, or combinations thereof.
The memory 72, which is a non-transitory computer readable storage medium, may be used to store non-transitory software programs, non-transitory computer executable programs, and modules, such as the corresponding program instructions/modules in the embodiments of the present invention. The processor 71 executes various functional applications and data processing of the processor by running the non-transitory software programs, instructions and modules stored in the memory 72, that is, the method for acquiring the cell impedance in the above method embodiment is implemented.
The memory 72 may include a storage program area and a storage data area, wherein the storage program area may store an operating device, an application program required for at least one function; the storage data area may store data created by the processor 71, and the like. Further, the memory 72 may include high speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory 72 may optionally include memory located remotely from the processor 71, and such remote memory may be connected to the processor 71 via 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 one or more modules are stored in the memory 72, and when executed by the processor 71, perform the method of obtaining the cell impedance in the embodiment shown in fig. 4.
The details of the electronic device may be understood with reference to the corresponding related description and effects in the embodiment shown in fig. 4, and are not described herein again.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (10)
1. A battery management system, the system comprising: the system comprises at least one battery cell module, a daisy chain communication module and a control module, wherein one end of the daisy chain communication module is connected with the control module through a serial peripheral interface, the other end of the daisy chain communication module is connected with the battery cell modules, and the battery cell modules are connected in a daisy chain communication mode;
the cell module comprises a functional element, and the functional element is used for measuring a cell impedance value;
the control module is used for receiving the cell impedance measurement signal and sending the cell impedance measurement signal to the daisy chain communication module through the serial peripheral interface;
the daisy chain communication module converts the cell impedance measurement signals into daisy chain differential signals and sends the daisy chain differential signals to the cell modules;
the battery cell module inputs the battery cell impedance value to the control module through the daisy chain differential signal.
2. The battery management system of claim 1, wherein the cell module inputs the cell impedance values to the control module via the daisy-chain differential signal, comprising:
the battery cell module inputs the battery cell impedance value to the daisy chain communication module through the daisy chain differential signal;
the daisy chain communication module converts the daisy chain differential signal into a standard serial peripheral interface signal, and inputs the standard serial peripheral interface signal to the control module, wherein the standard serial peripheral interface signal comprises the cell impedance value.
3. The battery management system of claim 1, wherein the system further comprises:
the upper computer is used for sending the cell impedance measurement signal to the communication module;
the communication module is connected with the control module and used for sending the cell impedance measurement signal to the control module.
4. The battery management system of claim 3, wherein the system further comprises: and the power supply is respectively connected with the communication module and the control module and used for supplying power.
5. The battery management system of claim 1, wherein the functional element is further configured to collect cell voltage data and cell temperature data.
6. A method of obtaining cell impedance for use in a battery management system according to any of claims 1 to 5; characterized in that the method comprises:
a control module in the battery management system receives a cell impedance measurement signal and sends the cell impedance measurement signal to a daisy chain communication module in the battery management system;
the daisy chain communication module converts the cell impedance measurement signal into a daisy chain differential signal and sends the daisy chain differential signal to a cell module in the battery management system;
functional elements in the battery cell module measure battery cell impedance values, and the battery cell impedance values are input to the control module through the daisy chain differential signals;
and the control module sends the cell impedance value to an upper computer through a communication module in the battery management system.
7. The method of claim 6, wherein inputting the cell impedance values to the control module via the daisy-chain differential signal comprises:
the battery cell module inputs the battery cell impedance value to the daisy chain communication module through the daisy chain differential signal;
the daisy chain communication module converts the daisy chain differential signal into a standard serial peripheral interface signal, and inputs the standard serial peripheral interface signal to the control module, wherein the standard serial peripheral interface signal comprises the cell impedance value.
8. A device for obtaining cell impedance, which is used in the battery management system according to any one of claims 1-5; characterized in that the device comprises:
the receiving module is used for receiving the battery core impedance measuring signal by the control module in the battery management system and sending the battery core impedance measuring signal to the daisy chain communication module in the battery management system;
the conversion module and the sending module are used for converting the cell impedance measurement signals into daisy chain differential signals by the daisy chain communication module and sending the daisy chain differential signals to the cell modules in the battery management system;
the measurement and transmission module is used for measuring a cell impedance value of a functional element in the cell module and inputting the cell impedance value to the control module through the daisy chain differential signal;
and the sending module is used for sending the battery core impedance value to an upper computer by the control module through a communication module in the battery management system.
9. A computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions for causing the computer to execute the method for obtaining cell impedance according to claim 6 or 7.
10. An electronic device, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the computer instructions to perform the method for obtaining cell impedance according to claim 6 or 7.
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| CN116106725A (en) * | 2023-03-24 | 2023-05-12 | 大唐恩智浦半导体（徐州）有限公司 | Multi-chip power-on test system, method and device and electronic equipment |
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| CN116106725A (en) * | 2023-03-24 | 2023-05-12 | 大唐恩智浦半导体（徐州）有限公司 | Multi-chip power-on test system, method and device and electronic equipment |
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