Battery monitoring equipment calibration device, method and system

Abstract

The present application discloses a calibration device, method and system for battery monitoring equipment, the device comprising: a battery monitoring equipment to be calibrated, a super capacitor, a control unit, a balancing unit and a standard resistance unit, the battery monitoring equipment to be calibrated is connected to the super capacitor, the balancing unit and the standard resistance unit are respectively connected to the super capacitor, and are used for the battery monitoring equipment to be calibrated to measure the voltage accuracy and internal resistance accuracy, the control unit is connected to the battery monitoring equipment to be calibrated, the super capacitor, the balancing unit and the standard resistance unit, and the standard resistance unit is connected to both ends of the super capacitor. The present invention can calibrate the battery monitoring equipment, reduce the failure rate of the DC power supply system, and can be widely used in the field of DC system battery monitoring and calibration technology.

Description

Technical Field

[0001] The present application relates to the technical field of electric power detection, and in particular to a calibration device, method and system for battery monitoring equipment. Background Art

[0002] Batteries are often used as backup power sources and energy storage power sources in power systems. In order to monitor the operating status of batteries, battery monitoring equipment is generally installed on the battery pack to monitor the internal resistance and single cell voltage of the batteries. Therefore, it is necessary to calibrate the battery testing equipment. However, in the research, factory commissioning, on-site inspection and other links, there is no equipment specifically used to calibrate battery monitoring equipment in the relevant technology, which makes it difficult to calibrate the internal resistance and voltage measurement accuracy of the battery monitoring equipment during production and operation. If the battery monitoring equipment is operated for a long time without calibration, the measurement accuracy may change, resulting in reduced accuracy of the monitoring results.

[0003] Therefore, the above-mentioned technical problems existing in the related technology need to be solved urgently. Summary of the invention

[0004] The present application aims to solve one of the technical problems in the related art. To this end, the present application provides a battery monitoring device calibration device, method and system, which can calibrate the battery detection device and improve the accuracy of the battery monitoring device.

[0005] According to one aspect of an embodiment of the present application, a calibration device for a battery monitoring device is provided, the device comprising: a battery monitoring device to be calibrated, a supercapacitor, a control unit, a balancing unit and a standard resistance unit, the battery monitoring device to be calibrated is connected to the supercapacitor, the balancing unit and the standard resistance unit are respectively connected to the supercapacitor, and are used for the battery monitoring device to be calibrated to measure voltage accuracy and internal resistance accuracy, the control unit is connected to the battery monitoring device to be calibrated, the supercapacitor, the balancing unit and the standard resistance unit, and is used to control the operation of the battery monitoring device to be calibrated, the supercapacitor, the balancing unit and the standard resistance unit.

[0006] In one of the embodiments, the device further includes a voltage balancing circuit, which is connected in parallel with the super capacitor and is used to keep the terminal voltage of the super capacitor consistent during the charging process.

[0007] In one embodiment, the supercapacitor and the equivalent resistor are connected in series to form a supercapacitor group for simulating a series battery group, wherein the number of the supercapacitors is consistent with the number of the equivalent resistors.

[0008] In one embodiment, one end of the super capacitor is connected to the standard resistor, and the other end of the super capacitor is provided with a wiring terminal, and one end of the standard resistor is connected to the super capacitor, and the other end of the standard resistor is provided with a wiring terminal.

[0009] In one embodiment, the control unit includes a charging unit and a discharging unit, the charging unit is connected to one end of the supercapacitor and is used to charge the supercapacitor at a preset voltage, and the discharging unit is connected to the other end of the supercapacitor and is used to discharge the supercapacitor at a preset voltage.

[0010] According to one aspect of an embodiment of the present application, a calibration method for a battery monitoring device is provided, which is applied to a calibration device for a battery monitoring device described in the previous embodiment, and the method includes:

[0011] According to the verification requirements, the control unit adjusts the terminal voltage of the supercapacitor to the floating charge voltage value of the battery monitoring device to be verified;

[0012] Acquire a first voltage and a second voltage across the supercapacitor;

[0013] A voltage measurement error result is calculated according to the first voltage and the second voltage.

[0014] In one embodiment, the method further comprises:

[0015] Obtaining a first internal resistance and a second internal resistance of the supercapacitor;

[0016] An internal resistance error of the battery monitoring device to be verified is determined according to the first internal resistance, the second internal resistance and a standard resistance.

[0017] In one embodiment, obtaining the first internal resistance and the second internal resistance of the supercapacitor includes:

[0018] After the terminal voltage of the supercapacitor reaches the floating charge voltage value of the battery monitoring device to be verified, obtaining a first internal resistance of the supercapacitor;

[0019] After the terminal voltage of the supercapacitor reaches the floating charge voltage value of the storage battery monitoring device to be verified, a second internal resistance of the supercapacitor is obtained.

[0020] In one embodiment, determining the internal resistance error of the battery monitoring device to be verified according to the first internal resistance, the second internal resistance and a standard resistance includes:

[0021] Calculating an absolute value of a difference between the first internal resistance and the second internal resistance;

[0022] If the error between the absolute value and the standard resistance is higher than a preset accuracy index, the battery monitoring device to be checked is determined to be unqualified.

[0023] In one of the embodiments, the system includes a verification device for a battery monitoring device as described in the previous embodiment.

[0024] The beneficial effects of the calibration device for battery monitoring equipment provided in the embodiment of the present application are as follows: the present invention can calibrate the battery monitoring equipment, so that the DC power supply system can operate safely, reduce the failure rate of the DC power supply system, and can be widely used in the field of DC system battery monitoring and calibration technology.

[0025] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A schematic diagram of a calibration device for a battery monitoring device provided in an embodiment of the present application;

[0028] Figure 2 A schematic diagram of the structure of a calibration device for a battery monitoring device provided in an embodiment of the present application;

[0029] Figure 3 A flowchart of a battery monitoring device calibration method provided in an embodiment of the present application;

[0030] Figure 4 An electrical structure connection diagram of a battery monitoring device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0032] The terms "first", "second", "third" and "fourth" etc. in the specification, claims and drawings of the present application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0033] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0034] Batteries are often used as backup power sources and energy storage power sources in power systems. In order to monitor the operating status of batteries, battery monitoring equipment is generally installed on the battery pack to monitor the internal resistance and single cell voltage of the batteries. Therefore, it is necessary to calibrate the battery testing equipment. However, in the research, factory commissioning, on-site inspection and other links, there is no equipment specifically used to calibrate battery monitoring equipment in the relevant technology, which makes it difficult to calibrate the internal resistance and voltage measurement accuracy of the battery monitoring equipment during production and operation. If the battery monitoring equipment is operated for a long time without calibration, the measurement accuracy may change, resulting in reduced accuracy of the monitoring results.

[0035] In order to solve the above problems, this application proposes a battery monitoring device calibration device. The specific principle is as follows Figure 1As shown in the figure: the battery online monitoring device is mainly composed of a battery monitoring module and group discharge and control. The battery monitoring module measures the voltage and internal resistance of a certain number of batteries, and the group discharge and control discharges the battery group monitored by each battery monitoring module respectively. During the discharge process, the battery monitoring module corresponding to the discharged battery group calculates the battery internal resistance by measuring the battery terminal voltage, current and its changes. Therefore, the battery internal resistance can be measured by the discharge method under both static and floating conditions. After the battery is charged and discharged, it is left to stand for a certain period of time, the battery open circuit voltage U1 is measured, and then the battery is discharged through the constant current I2, and the battery terminal voltage U2 is measured under the constant current discharge, and the battery internal resistance r can be calculated. The battery online monitoring device measures the battery internal resistance when the battery is in the floating charge state. In the floating charge state, the battery floating current is I1 and the floating voltage is U1. By measuring the battery terminal voltage U2 under constant current (I2) discharge, and the battery terminal voltage U3 after stopping the constant current discharge, the battery internal resistance r can be calculated. From the principle of measuring internal resistance by the discharge method, it can be seen that the battery is equivalent to a voltage source with an internal resistance of r, and the charged supercapacitor can also be equivalent to a voltage source with an internal resistance of r, so the supercapacitor can be used to be equivalent to the battery. The present invention adopts a supercapacitor equivalent single cell to provide an internal resistance and standard resistance calibration method for the battery online monitoring device, which can be widely used in the research of battery online monitoring, product factory calibration, on-site calibration and other places.

[0036] like Figure 2 As shown, a verification device for a battery monitoring device proposed in the present application includes: a battery monitoring device to be verified, a supercapacitor, a control unit, a balancing unit and a standard resistance unit, wherein the battery monitoring device to be verified is connected to the supercapacitor, and the balancing unit and the standard resistance unit are respectively connected to the supercapacitor, and are used for the battery monitoring device to be verified to measure the voltage accuracy and internal resistance accuracy, and the control unit is connected to the battery monitoring device to be verified, the supercapacitor, the balancing unit, and the standard resistance unit, and is used to control the operation of the battery monitoring device to be verified, the supercapacitor, the balancing unit and the standard resistance unit, and the standard resistance unit is connected to both ends of the supercapacitor, and is used to measure the terminal voltage of each supercapacitor. In a specific embodiment, the control unit can adopt a microprocessor in the prior art; the supercapacitor mainly plays the role of simulating a series battery group; the control unit mainly controls the charging and discharging of the supercapacitor group.

[0037] In this embodiment, the supercapacitor is a capacitor group composed of a plurality of single capacitors, and is used to simulate the internal structure of a battery group.

[0038] Exemplarily, taking the verification of the battery online monitoring device of the first DC power supply system as an example, the single supercapacitor group is charged to the floating charge voltage value of the monitored battery through the charge and discharge control unit, the first voltage and the second voltage of the single supercapacitor group are obtained by the battery monitoring module and the voltage measurement unit, and the battery online monitoring device is used to communicate with the battery online monitoring and verification device to transmit the first voltage data to the control unit of the battery online monitoring and verification device. The control unit can calculate the voltage measurement error of the battery monitoring module based on the obtained first voltage and second voltage, and judge the voltage measurement accuracy of the battery monitoring module based on the voltage measurement error.

[0039] Optionally, the device further includes a voltage balancing circuit, which is connected in parallel with the supercapacitor to keep the terminal voltage of the supercapacitor consistent during the charging process. Among them, the voltage balancing circuit unit mainly plays a role in ensuring that the terminal voltage of each single supercapacitor group is roughly the same. In the case where the capacitors are connected in series, it is necessary to ensure that the capacitors in series always maintain voltage balancing. If the voltage on the capacitors deviates, the circuit will not work properly. In severe cases, one of the capacitors will have a high withstand voltage and burn out. The leakage current of the capacitor is one of its characteristics. Due to the different manufacturing processes, the leakage current of each capacitor is not a certain value. During use, the leakage current value of the capacitor will also change. The supplier only provides the range of the leakage current of the capacitor, and cannot ensure that the leakage current value of each capacitor is the same. Therefore, in the case of capacitors in series use, the voltage balancing circuit of this embodiment is required to ensure that the terminal voltage of each series capacitor is balanced.

[0040] Optionally, the supercapacitor is connected in series with an equivalent resistor to form a supercapacitor group for simulating a series battery group, wherein the number of the supercapacitors is consistent with the number of the equivalent resistors.

[0041] In addition, the verification device of the battery monitoring equipment in the embodiment of the present application also includes a human-computer interaction unit, which mainly plays the function of data information display and interface operation; a USB interface module, which mainly plays the function of reading and writing programs and test reports; and a communication interface module, which mainly plays the role of communication between the battery online monitoring verification device and the battery online monitoring device, and exchanges test data with each other.

[0042] It should be noted that, in the process of obtaining the first internal resistance and the second internal resistance, the battery monitoring module and the corresponding discharge control circuit of the battery online monitoring device are connected to the battery online monitoring and verification device, so that each channel of the battery monitoring module is measured by connecting to one supercapacitor and one standard resistor, and the battery online monitoring device obtains the first internal resistance, and the battery monitoring module and the corresponding discharge control circuit of the battery online monitoring device are connected to the battery online monitoring and verification device, so that some channels of the battery monitoring module are measured by connecting to one supercapacitor, and some channels are measured by connecting to one supercapacitor and two standard resistors, and the battery online monitoring device obtains the second internal resistance. Therefore, the CPU unit determines the internal resistance measurement accuracy of the battery online monitoring device according to the first internal resistance, the second internal resistance and the standard resistance.

[0043] Optionally, one end of the supercapacitor is connected to the standard resistor, and the other end of the supercapacitor is provided with a wiring terminal, and one end of the standard resistor is connected to the supercapacitor, and the other end of the standard resistor is provided with a wiring terminal. The number of supercapacitors is the same as that of resistors, and one or more supercapacitors are connected to one or more resistors to form independent branches.

[0044] Optionally, the control unit includes a charging unit and a discharging unit, the charging unit is connected to one end of the supercapacitor and is used to charge the supercapacitor at a preset voltage, and the discharging unit is connected to the other end of the supercapacitor and is used to discharge the supercapacitor at a preset voltage.

[0045] The present application also proposes a battery monitoring device calibration method, which is applied to a battery monitoring device calibration device described in the previous embodiment, and the method includes:

[0046] S301. According to the verification requirement, the control unit adjusts the terminal voltage of the supercapacitor to the floating charge voltage value of the battery monitoring device to be verified.

[0047] S302: Obtain a first voltage and a second voltage across the supercapacitor.

[0048] S303: Calculate a voltage measurement error result according to the first voltage and the second voltage.

[0049] Optionally, the method further includes: obtaining a first internal resistance and a second internal resistance of the supercapacitor; and determining an internal resistance error of the battery monitoring device to be verified based on the first internal resistance, the second internal resistance and a standard resistance. Optionally, obtaining the first internal resistance and the second internal resistance of the supercapacitor includes: obtaining the first internal resistance of the supercapacitor after the terminal voltage of the supercapacitor is the floating charge voltage value of the battery monitoring device to be verified; and obtaining the second internal resistance of the supercapacitor after the terminal voltage of the supercapacitor is the floating charge voltage value of the battery monitoring device to be verified.

[0050] Optionally, determining the internal resistance error of the battery monitoring device to be checked based on the first internal resistance, the second internal resistance and a standard resistance includes: calculating the absolute value of the difference between the first internal resistance and the second internal resistance; if the error between the absolute value and the standard resistance is higher than a preset accuracy index, determining that the battery monitoring device to be checked is unqualified. Specifically, in this embodiment, determining the internal resistance error of the battery monitoring device to be verified based on the first internal resistance, the second internal resistance and the standard resistance specifically includes: connecting the battery monitoring module and the corresponding discharge control circuit of the battery online monitoring device to the battery online monitoring and verification device, so that each channel of the battery monitoring module is measured by connecting one supercapacitor and one standard resistor; after charging the single supercapacitor group to the floating charge voltage value of the monitored battery, the battery online monitoring device obtains the first internal resistance; adjusting the battery monitoring module and the corresponding discharge control circuit of the battery online monitoring device to be connected to the battery online monitoring and verification device, so that part of the channel of the battery monitoring module is measured by connecting one supercapacitor, and part of the channel of the battery monitoring module is measured by connecting one supercapacitor and two standard resistors; after charging the single supercapacitor group to the floating charge voltage value of the monitored battery, the battery online monitoring device obtains the second internal resistance; according to the first internal resistance and the second internal resistance, calculating the absolute value of the difference between two measurement results of each channel of the battery monitoring module, and comparing it with the standard resistance value, to determine the internal resistance measurement accuracy result of the battery online monitoring device.

[0051] A battery online monitoring device calibration method of the present embodiment connects the battery online monitoring calibration device to the battery monitoring module of the battery online monitoring device of the DC power supply system, uses the battery monitoring module and the voltage measuring unit to obtain the terminal voltage of each single super capacitor group, and the control module determines the voltage measurement accuracy of the battery online monitoring device according to the DC voltage obtained by the battery monitoring module and the DC voltage obtained by the voltage measuring unit; uses the discharge control circuit of the battery online monitoring device to obtain the internal resistance of each single super capacitor group and a standard resistor, adjusts the wiring mode between the battery monitoring module and the battery online monitoring calibration device, and similarly obtains the internal resistance of some single super capacitor groups through the discharge control circuit of the battery online monitoring device, obtains the internal resistance of some single super capacitor groups and two standard resistors, calculates the absolute value of the difference between two measurement results of each channel of the battery monitoring module, and compares it with the standard resistance value to determine the internal resistance measurement accuracy of the battery online monitoring device, thereby ensuring the safe operation of the DC power supply system, and has the characteristics of simple implementation principle.

[0052] The verification method of this embodiment can be applied to different power supply systems, such as Figure 4 As shown, when the calibration method of the battery monitoring device proposed in this embodiment is applied to a DC power supply system, the DC power supply system includes a first DC power supply system and a second DC power supply system, and the calibration method of the online battery monitoring device includes the following steps:

[0053] Step 1: Connect a corresponding number of battery online monitoring and verification devices according to the number of battery monitoring modules of the battery online monitoring device.

[0054] Step 2: The battery online monitoring and verification device uses the charge and discharge control unit to adjust the terminal voltage of the single supercapacitor group to the floating charge voltage value of the battery under test according to the verification requirements of the battery online monitoring device.

[0055] Step 3: The battery online monitoring device and the battery online monitoring and verification device start voltage sampling.

[0056] Step 4: Obtain a first voltage and a second voltage across the single supercapacitor group.

[0057] Step 5: Determine a voltage measurement error result of a battery online monitoring device of the station DC power supply system based on the first voltage and the second voltage.

[0058] The battery online monitoring and verification device of the present application can be used to verify whether the voltage accuracy of the battery online monitoring device of the DC power supply system meets the technical requirements. For example, when the error between the first voltage obtained by the measurement module of the battery online monitoring device and the second voltage obtained by the voltage measurement unit of the battery online monitoring and verification device is higher than the voltage accuracy technical index of the battery online monitoring device itself, it can be determined that the voltage measurement accuracy of the measurement module of the battery online monitoring device is unqualified.

[0059] In addition, the present application also proposes a battery monitoring equipment calibration system, the system comprising a battery monitoring equipment calibration device as described in the above embodiment.

[0060] In some selectable embodiments, the function / operation mentioned in the block diagram may not occur in the order mentioned in the operation diagram. For example, depending on the function / operation involved, the two boxes shown in succession can actually be executed substantially simultaneously or the boxes can sometimes be executed in reverse order. In addition, the embodiment presented and described in the flow chart of the application is provided by way of example, for the purpose of providing a more comprehensive understanding of technology. The disclosed method is not limited to the operation and logic flow presented herein. Selectable embodiments are expected, wherein the order of various operations is changed and the sub-operation of a part described as a larger operation is performed independently.

[0061] In addition, although the present application is described in the context of functional modules, it should be understood that, unless otherwise specified, one or more of the functions and / or features can be integrated into a single physical device and / or software module, or one or more functions and / or features can be implemented in a separate physical device or software module. It is also understood that a detailed discussion of the actual implementation of each module is unnecessary for understanding the present application. More specifically, in view of the properties, functions, and internal relationships of the various functional modules in the device disclosed herein, the actual implementation of the module will be understood within the conventional techniques of the engineer. Therefore, those skilled in the art can implement the present application set forth in the claims without excessive experimentation using ordinary techniques. It is also understood that the specific concepts disclosed are merely illustrative and are not intended to limit the scope of the present application, which is determined by the full scope of the attached claims and their equivalents.

[0062] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, and other media that can store program codes.

[0063] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0064] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0065] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0066] In the above description of this specification, the description with reference to the terms "one embodiment / example", "another embodiment / example" or "certain embodiments / examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0067] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

[0068] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery monitoring device calibration device, characterized in that: The device comprises: a battery monitoring device to be checked, a super capacitor, a control unit, a balancing unit and a standard resistance unit, wherein the battery monitoring device to be checked is connected to the super capacitor, and the balancing unit and the standard resistance unit are respectively connected to the super capacitor, and are used to measure the voltage accuracy and internal resistance accuracy of the battery monitoring device to be checked, and the control unit is connected to the battery monitoring device to be checked, the super capacitor, the balancing unit and the standard resistance unit, and is used to control the operation of the battery monitoring device to be checked, the super capacitor, the balancing unit and the standard resistance unit, and calculate the voltage measurement error and the internal resistance measurement error of the battery monitoring module of the battery monitoring device to be checked The supercapacitor and the standard resistor are connected in series to form a supercapacitor group for simulating a series battery group; wherein the number of the supercapacitors is consistent with the number of the standard resistors, the voltage accuracy is determined by measuring the terminal voltage of the supercapacitor by a battery monitoring module and a voltage measuring unit, the internal resistance accuracy is determined by measuring the first internal resistance and the second internal resistance of the supercapacitor by the battery monitoring module, the first internal resistance is determined by measuring each channel of the battery monitoring module by connecting one supercapacitor and one standard resistor, and the second internal resistance is determined by measuring some channels of the battery monitoring module by connecting one supercapacitor and two standard resistors.

2. The battery monitoring device according to claim 1, characterized in that: The device also includes a voltage balancing circuit, which is connected in parallel with the super capacitor and is used to keep the terminal voltage of the super capacitor consistent during the charging process.

3. The calibration device for battery monitoring equipment according to claim 1, characterized in that: One end of the super capacitor is connected to the standard resistor, and the other end of the super capacitor is provided with a wiring terminal. One end of the standard resistor is connected to the super capacitor, and the other end of the standard resistor is provided with a wiring terminal.

4. The calibration device for battery monitoring equipment according to claim 1, characterized in that: The control unit includes a charging unit and a discharging unit, wherein the charging unit is connected to one end of the supercapacitor and is used to charge the supercapacitor at a preset voltage, and the discharging unit is connected to the other end of the supercapacitor and is used to discharge the supercapacitor at a preset voltage.

5. A method for calibrating a battery monitoring device, characterized in that: A calibration device for a battery monitoring device applied to any one of claims 1 to 4, the method comprising: According to the verification requirements, the control unit adjusts the terminal voltage of the supercapacitor to the floating charge voltage value of the battery monitoring device to be verified; The terminal voltage of the supercapacitor is measured by the battery monitoring module to determine a first voltage; the terminal voltage of the supercapacitor is measured by the voltage measuring unit to determine a second voltage; wherein the first voltage represents the terminal voltage of the supercapacitor measured by the battery monitoring module, and the second voltage represents the terminal voltage of the supercapacitor measured by the voltage measuring unit; A voltage measurement error result is calculated according to the first voltage and the second voltage.

6. A battery monitoring device calibration method according to claim 5, characterized in that: The method further includes: obtaining a first internal resistance and a second internal resistance of the supercapacitor; An internal resistance error of the battery monitoring device to be verified is determined according to the first internal resistance, the second internal resistance and a standard resistance.

7. A battery monitoring device calibration method according to claim 6, characterized in that: The obtaining the first internal resistance and the second internal resistance of the supercapacitor includes: After the terminal voltage of the supercapacitor reaches the floating charge voltage value of the battery monitoring device to be verified, obtaining a first internal resistance of the supercapacitor; After the terminal voltage of the supercapacitor reaches the floating charge voltage value of the storage battery monitoring device to be verified, a second internal resistance of the supercapacitor is obtained.

8. A battery monitoring device calibration method according to claim 6, characterized in that: The step of determining the internal resistance error of the battery monitoring device to be verified according to the first internal resistance, the second internal resistance and a standard resistance includes: Calculating an absolute value of a difference between the first internal resistance and the second internal resistance; If the error between the absolute value and the standard resistance is higher than a preset accuracy index, the battery monitoring device to be checked is determined to be unqualified.

9. A calibration system for a battery monitoring device, characterized in that: The system comprises a verification device for a battery monitoring device according to any one of claims 1-4.

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