Power battery potential detection system, method and equipment, medium and program product

Abstract

The embodiment of the invention provides a power battery potential detection system, method and device, a medium and a program product. The detection system comprises a control unit, a high-voltage detection unit and a low-voltage detection unit, the control unit is respectively connected with the high-voltage detection unit and the low-voltage detection unit, the high-voltage detection unit is used for connecting a high-voltage module of the power battery and an external metal structure of the power battery, and the low-voltage detection unit is used for connecting any two detection points of the external metal structure; the external metal structure comprises at least two connected structural members; and the control unit is used for performing potential equalization detection on the external metal structure by using high-voltage alternating current through the high-voltage detection unit and performing potential equalization detection on the external metal structure by using low-voltage direct current through the low-voltage detection unit. The system improves the accuracy of potential equalization detection of the external metal structure of the power battery.

Description

Technical Field

[0001] The present application relates to the field of power batteries, and in particular to a power battery potential detection system, method, device, medium and program product. Background Art

[0002] In the field of power batteries, ensuring the safety of power batteries is crucial. External metal structures of power batteries, such as trays, pull plates, and other multi-component metal structures, can generate potential differences if there are differences in electrical potential. In the event of a vehicle body leak, if this potential difference is too large, people who come into contact with the external metal structure of the power battery could receive an electric shock. Therefore, ensuring potential balance among the external metal structures of the power battery is crucial.

[0003] Existing technology primarily uses the current-voltage (IR) method for potential equalization testing. First, two test points can be arbitrarily selected on the power battery's external metal structure. Second, a DC current is input between the two test points, and the voltage change at these two points is detected to calculate the impedance between the test points. When the impedance is infinitely small, the potential equalization test on the power battery's external metal structure has passed. The impedance value is then used to determine whether the test has passed.

[0004] However, the detection accuracy of the above detection method is not high. Summary of the Invention

[0005] Embodiments of the present application provide a power battery potential detection system, method, device, medium, and program product to improve the accuracy of potential equalization detection of the external metal structure of the power battery.

[0006] In a first aspect, an embodiment of the present application provides a power battery potential detection system, the detection system comprising: a control unit, a high voltage detection unit, and a low voltage detection unit;

[0007] The control unit is connected to the high-voltage detection unit and the low-voltage detection unit respectively, wherein the high-voltage detection unit is used to connect the high-voltage module of the power battery and the external metal structure of the power battery, and the low-voltage detection unit is used to connect any two detection points of the external metal structure; the external metal structure includes: at least two connected structural members;

[0008] The control unit is configured to perform potential equalization detection on the external metal structure using high voltage alternating current through the high voltage detection unit, and to perform potential equalization detection on the external metal structure using low voltage direct current through the low voltage detection unit.

[0009] In a possible implementation, the high-voltage detection unit includes: a high-voltage generation module, and a first measurement module;

[0010] The high voltage generation module and the first measurement module are both used to connect the high voltage module and the external metal structure;

[0011] The high voltage generation module is used to apply high voltage alternating current between the high voltage module and the external metal structure;

[0012] The first measurement module is configured to perform potential equalization detection on the external metal structure when a high-voltage alternating current is applied between the high-voltage module and the external metal structure.

[0013] In a possible implementation, the first measurement module is specifically used to detect leakage current between the high-voltage module and the external metal structure, and to detect whether arcing occurs in the external metal structure;

[0014] The control unit is specifically used to determine whether the external metal structure has a problem of failing the potential equalization test due to poor connection of structural parts based on the leakage current between the high-voltage module and the external metal structure, and the detection result of whether the external metal structure has an arcing phenomenon.

[0015] In a possible implementation manner, the control unit is specifically configured to:

[0016] If the leakage current between the high-voltage module and the external metal structure is within a preset range and arcing occurs in the external metal structure, it is determined that the external metal structure has failed the potential equalization test due to poor connection of structural parts;

[0017] Alternatively, when the leakage current between the high-voltage module and the external metal structure is within a preset range and there is no arcing phenomenon in the external metal structure, it is determined that the external metal structure does not have a problem of failing the potential equalization test due to poor connection of structural parts.

[0018] In a possible implementation manner, the control unit is further configured to:

[0019] When the leakage current between the high-voltage module and the external metal structure is not within a preset range, it is determined that the high-voltage generation module is operating abnormally.

[0020] In a possible implementation, the low voltage detection unit includes: a low voltage generation module, and a second measurement module;

[0021] The low voltage generating module and the second measuring module are both used to connect any two detection points of the external metal structure;

[0022] The low voltage generating module is used to apply low voltage direct current between any two detection points;

[0023] The second measuring module is used to detect whether the external metal structure has a problem of failing the potential equalization test when a low-voltage direct current is applied between any two detection points.

[0024] In a possible implementation manner, the second measuring module is specifically configured to measure the potential difference between any two detection points;

[0025] The control unit is specifically configured to determine whether the external metal structure has a problem of failing a potential equalization test based on the potential difference between the arbitrary two detection points.

[0026] In a possible implementation manner, the control unit is specifically configured to:

[0027] determining the impedance between the arbitrary two detection points according to the potential difference between the arbitrary two detection points and the current of the direct current;

[0028] When the impedance is greater than a preset impedance, determining that the potential equalization test of the external metal structure fails;

[0029] When the impedance is less than or equal to the preset impedance, it is determined that the potential equalization test of the external metal structure has passed.

[0030] In a possible implementation, the detection system further includes: a power supply unit, a first switch unit, and a second switch unit;

[0031] The power supply unit is connected to the high voltage detection unit through the first switch unit, and is connected to the low voltage detection unit through the second switch unit;

[0032] The control unit is also connected to the first switch unit, and is used to control the operation of the high-voltage detection unit through the first switch unit;

[0033] The control unit is connected to the second switch unit and is used to control the low voltage detection unit to operate through the second switch unit.

[0034] In a possible implementation, the control unit is further configured to perform potential equalization detection configuration on the high voltage detection unit and / or the low voltage detection unit.

[0035] In a possible implementation, the detection system further includes: a human-computer interaction unit;

[0036] The human-computer interaction unit is configured to perform at least one of the following:

[0037] Outputting a potential equalization detection result of the power battery;

[0038] Receives user input for potential equalization detection configuration.

[0039] In a possible implementation, the detection system further includes: a safety unit;

[0040] The safety unit is connected to the control unit, the high voltage detection unit and the low voltage detection unit respectively, and is used for performing safety protection during the potential equalization detection process.

[0041] In a possible implementation, the detection system further includes: an electromagnetic shielding unit;

[0042] The electromagnetic shielding unit is located between the high-voltage detection unit and the low-voltage detection unit, and is used to perform electromagnetic shielding on the high-voltage detection unit and the low-voltage detection unit.

[0043] In a second aspect, an embodiment of the present application provides a method for detecting the potential of a power battery, the method being applied to a control unit in a power battery potential detection system according to any one of the first aspects; the method comprising:

[0044] The high voltage detection unit uses high voltage alternating current to perform potential equalization detection on the external metal structure, and the low voltage detection unit uses low voltage direct current to perform potential equalization detection on the external metal structure.

[0045] In a third aspect, an embodiment of the present application provides an electronic device, comprising: a memory, a processor;

[0046] The memory stores computer-executable instructions;

[0047] The processor executes the computer-executable instructions stored in the memory, so that the processor performs the method as described in the second aspect above.

[0048] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, they are used to implement the method described in the second aspect above.

[0049] In a fifth aspect, an embodiment of the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the method described in the second aspect above.

[0050] The embodiments of the present application provide a power battery potential detection system, method, device, medium, and program product, which integrate a control unit, a high-voltage detection unit, and a low-voltage detection unit, and can comprehensively perform potential equalization detection on the external metal structure of the power battery. It can not only detect the failure of the potential equalization detection of the external metal structure due to poor connection of structural parts, but also detect the failure of the potential equalization detection of the external metal structure due to other reasons, thereby improving the accuracy of the potential equalization detection of the external metal structure of the power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0052] Figure 1 A schematic diagram of the structure of a power battery potential detection system provided in an embodiment of the present application;

[0053] Figure 2 A schematic diagram of another structure for detecting the potential of a power battery provided in an embodiment of the present application;

[0054] Figure 3 This is a schematic diagram of the structure of an electronic device provided in this application.

[0055] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0056] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0057] In this application, the term "include" and its variations may refer to non-restrictive inclusion; the term "or" and its variations may refer to "and / or". In this application, the terms "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. In this application, "plurality" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the previous and subsequent associated objects are in an "or" relationship.

[0058] The power battery is the heart of an electric vehicle, and its external metal structures, such as the tray and pull plates, together form the structural support for the power battery. However, if there are differences in electrical potential between the external metal structures of the power battery, a potential difference may occur. In this case, if there is leakage in the vehicle body, people who come into contact with the external metal structures of the power battery may receive an electric shock, causing personal injury. Therefore, ensuring the equal potential of the external metal structures of the power battery is a key measure to prevent electric shock accidents and protect personnel safety.

[0059] Existing technology primarily uses the current-voltage (IR) method to perform potential equalization testing on the external metal structure of a power battery. This method inputs direct current to the test point on the external metal structure of the power battery and uses high-precision instruments to detect voltage changes on the external metal structure, thereby calculating the impedance. When the impedance is infinitely small, the potential equalization test on the external metal structure of the power battery has passed. The impedance value is used to determine whether the potential equalization test on the external metal structure of the power battery has passed.

[0060] It should be understood that a passing of the potential equalization test for the power battery's external metal structure may indicate that the power battery's external metal structure meets the potential equalization requirements, i.e., the potential equalization capability is qualified. A failing of the potential equalization test for the power battery's external metal structure may indicate that the power battery's external metal structure does not meet the potential equalization requirements, i.e., the potential equalization capability is poor.

[0061] However, although the IR method can reflect the potential equilibrium status of the external metal structure of the power battery to a certain extent, it has certain limitations.

[0062] First, the IR method's test points are manually selected, which can result in test results that don't fully reflect the potential equalization status of the power battery's external metal structure. Due to the complex structure and numerous metal components of a power battery's external metal structure, manually selected test points often fail to cover all critical areas, potentially overlooking potential equalization test failures.

[0063] Secondly, according to the principle of the IR method, current tends to flow along the path of least impedance. This means that during the detection process, the current may only flow through those metal structures with lower impedance, while ignoring those with higher impedance. Therefore, this method may not truly reflect the potential equalization status of the external metal structures of the power battery. In particular, the IR method has very limited detection capabilities for those problems that fail the potential equalization test due to poor connections, such as unwelded connections between external metal structures, attenuated or missing screw torque.

[0064] Therefore, the embodiments of the present application provide a power battery potential detection system, method, device, medium and program product. On the basis of the existing technology, the accuracy of power battery potential detection is improved by adding detection of the problem of failure of potential equalization detection caused by poor connection of external metal structures.

[0065] The following specific embodiments describe in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0066] Figure 1 This is a schematic diagram of the structure of the power battery potential detection system provided in an embodiment of the present application. It should be noted that the connections between units, between units and modules, and between modules in the power battery potential detection system provided in an embodiment of the present application can all be made through wired connections, such as wire connections, and this application does not limit this.

[0067] like Figure 1 As shown, the power battery potential detection system includes a control unit, a high voltage detection unit, and a low voltage detection unit. The control unit is connected to the high voltage detection unit and the low voltage detection unit respectively.

[0068] The control unit can control the working status of the high-voltage detection unit and the low-voltage detection unit. The control unit can also determine whether the potential equalization test of the external metal structure of the power battery has passed based on the detection results of the high-voltage detection unit and / or the low-voltage detection unit.

[0069] The high-voltage detection unit is used to connect the high-voltage module of the power battery and the external metal structure of the power battery. The external metal structure includes: at least two connected structural parts.

[0070] Optionally, the high-voltage detection unit may be a unit that detects the external metal structure of the power battery using a high voltage, which may be a voltage compared to the voltage of the power battery during normal operation.

[0071] The high-voltage detection unit may be capable of applying high-voltage AC power to the power battery and, during this process, performing potential equalization testing on the external metal structure. In this implementation, the high-voltage detection unit may generate the high-voltage AC power applied to the power battery itself, or it may convert an electrical signal provided by another power supply unit into high-voltage AC power and then apply it to the power battery.

[0072] Alternatively, the high-voltage detection unit is only used to perform potential equalization detection on the external metal structure, and the high-voltage alternating current is applied to the power battery by other units or devices.

[0073] The high-voltage module of a power battery may be a module in the power battery that uses high voltage to achieve a specific function, for example, a heating device of the power battery.

[0074] The external metal structure of the power battery may include at least two connected structural parts such as a tray and a pull plate.

[0075] There will be a gap between the high-voltage module of the power battery and the external metal structure of the power battery. If the external metal structure fails the potential equalization test due to poor connection of structural parts, according to the principle of high-voltage alternating current technology, arcing will occur between the high-voltage module of the power battery and the external metal structure when high-voltage alternating current is applied between the two.

[0076] Therefore, the control unit can use high-voltage alternating current to perform potential equalization testing on the external metal structure through the high-voltage detection unit. The high-voltage detection unit can connect the high-voltage module of the power battery and the external metal structure of the power battery to detect arcing between the high-voltage module of the power battery and the external metal structure of the power battery under high voltage, and report this detection result to the control unit. The control unit can use the arcing phenomenon to determine whether the external metal structure has failed the potential equalization test due to poor connection of structural parts.

[0077] The low-voltage detection unit is used to connect any two detection points of the external metal structure. The two detection points can be manually selected, for example, they can be the farthest points of the external metal structure, which is not limited in this application.

[0078] Optionally, the low voltage detection unit may be a unit that uses low voltage to detect the external metal structure of the power battery. Optionally, the low voltage may be related to the need for safe power use, which is not limited in this application.

[0079] The low-voltage detection unit may be capable of applying low-voltage electricity to the power battery and, during this process, performing potential equalization testing on the external metal structure. In this implementation, the low-voltage electricity applied by the low-voltage detection unit to the power battery may be generated by the low-voltage detection unit itself, or may be converted from an electrical signal provided by another power supply unit into low-voltage electricity and then applied to the power battery.

[0080] Alternatively, the low voltage detection unit is only used to perform potential equalization detection on the external metal structure, and the low voltage electricity is applied to the power battery by other units or devices.

[0081] If the external metal structure fails the potential equalization test due to poor connection of structural parts, the control unit can apply low voltage electricity to any two detection points of the external metal structure and use the above-mentioned IR method to perform potential equalization test on the external metal structure.

[0082] The embodiment of the present application integrates a control unit, a high-voltage detection unit, and a low-voltage detection unit to comprehensively perform potential equalization detection on the external metal structure of the power battery. It can not only detect failure of the potential equalization detection of the external metal structure due to poor connection of structural parts, but also detect failure of the potential equalization detection of the external metal structure due to other reasons, thereby improving the accuracy of the potential equalization detection of the external metal structure of the power battery.

[0083] The high voltage detection unit and the low voltage detection unit are further described below.

[0084] High voltage detection unit:

[0085] As described above, the high-voltage detection unit may have the functions of applying high-voltage AC power to the power battery and, during the application of the high-voltage AC power to the power battery, performing a potential equalization test on the external metal structure. Alternatively, the high-voltage detection unit may be used only to perform a potential equalization test on the external metal structure, with the high-voltage AC power being applied to the power battery by another unit or device.

[0086] The following is an example of the high-voltage detection unit having the function of applying high-voltage AC power to the power battery and performing potential equalization detection on the external metal structure during the process of applying high-voltage AC power to the power battery.

[0087] For example, the high-voltage detection unit may include a high-voltage generation module and a first measurement module. Both the high-voltage generation module and the first measurement module are used to connect the power battery's high-voltage module to an external metal structure. The high-voltage generation module and the first measurement module are described in further detail below.

[0088] The high voltage generation module is used to apply high voltage alternating current between the high voltage module and the external metal structure.

[0089] Optionally, the high-voltage generation module can apply high-voltage AC power to the power battery through the test port of the high-voltage module and the external metal structure. This high-voltage AC power can be generated by the module itself, or it can be converted from an electrical signal provided by another power supply unit and then applied to the power battery. This application does not limit this. This high-voltage AC power can be higher than the normal operating voltage of the power battery.

[0090] By using high-voltage alternating current, a strong periodically changing electric field can be formed, which promotes the ionization of gas molecules and the stable combustion of the arc. At the same time, the arc is naturally extinguished when the current passes through zero, minimizing damage to the power battery.

[0091] Alternatively, for example, the high-voltage AC power applied by the high-voltage generation module is converted from electrical signals provided by other power supply units into high-voltage AC power and then applied to the power battery. The high-voltage generation module may include a high-voltage transformer and a control circuit. The high-voltage transformer can convert the external high voltage into the required high-voltage AC power, and the control circuit can precisely control the parameters of the high-voltage AC power. Optionally, the high-voltage generation module may also include any one or more of a display unit and a safety isolation unit. The display unit can display the operating status of the high-voltage generation module in real time, and the safety isolation unit can ensure the safe operation of the high-voltage generation module.

[0092] The first measurement module is used to perform potential equalization detection on the external metal structure when a high-voltage alternating current is applied between the high-voltage module and the external metal structure.

[0093] Optionally, the first measurement module may perform a potential equalization test on the external metal structure by detecting whether arcing occurs in the external metal structure when a high-voltage alternating current is applied between the high-voltage module and the external metal structure. Optionally, before detecting whether arcing occurs in the external metal structure, the first measurement module may detect a leakage current between the high-voltage module and the external metal structure to perform a potential equalization test on the external metal structure.

[0094] Taking the first measurement module detecting the leakage current between the high-voltage module and the external metal structure, and detecting whether the external metal structure has an arcing phenomenon as an example, the potential equalization detection of the external metal structure by the first measurement module is further explained.

[0095] Leakage current refers to the leakage current generated when AC high voltage is applied between the high-voltage module of the power battery and the external metal structure, which is a safety capacitor (Y capacitor) separated by air or other structural adhesive. The formula for leakage current is as follows:

[0096]

[0097] in, It can represent the leakage current, It can represent capacitance, Can represent AC voltage, It can represent the frequency of the AC high voltage, and the leakage current can reflect the capacitive reactance of the Y capacitor.

[0098] The first measurement module can detect the leakage current and transmit it to the control unit. The control unit can determine whether the high voltage generation module works normally based on the leakage current.

[0099] Optionally, the first measurement module can detect whether there is arcing in the external metal structure and transmit it to the control unit. The control unit can determine whether the external metal structure has a potential equalization test failure caused by poor connection of structural parts based on the arcing phenomenon.

[0100] After the first measurement module obtains a test result, the test result can be transmitted to the control unit. The control unit is specifically configured to determine whether the external metal structure has failed the potential equalization test due to a poor connection of structural components based on the leakage current between the high-voltage module and the external metal structure and the detection result of whether the external metal structure has arcing.

[0101] Optionally, if the leakage current between the high-voltage module and the external metal structure is not within a preset range, it is determined that the high-voltage generation module is operating abnormally. If the leakage current between the high-voltage module and the external metal structure is within a preset range, it is determined that the high-voltage generation module is operating normally.

[0102] Optionally, when the leakage current between the high-voltage module and the external metal structure is within a preset range and arcing occurs in the external metal structure, the control unit determines that the external metal structure has failed the potential equalization test due to poor connection of structural parts.

[0103] Alternatively, when the leakage current between the high-voltage module and the external metal structure is within a preset range and there is no arcing phenomenon in the external metal structure, it is determined that the external metal structure does not have a problem of failing the potential equalization test due to poor connection of structural parts.

[0104] In the embodiment of the present application, a high-voltage alternating current can be applied between the high-voltage module of the power battery and the external metal structure through the high-voltage generation module in the high-voltage detection unit, and a potential equalization detection can be performed on the external metal structure through the first measurement module in the high-voltage detection unit. This can effectively detect the problem of the external metal structure of the power battery failing the potential equalization detection due to poor connection of structural parts. Compared with the prior art in which manual point selection may miss potential unequal potential problems, the embodiment of the present application can improve the accuracy of the potential equalization detection of the power battery.

[0105] Low voltage detection unit:

[0106] As described above, the low-voltage detection unit may have the function of applying low voltage electricity to the power battery and, during the process of applying low voltage electricity to the power battery, performing potential equalization detection on the external metal structure. Alternatively, the low-voltage detection unit is only used to perform potential equalization detection on the external metal structure, and the low voltage electricity is applied to the power battery by other units or devices.

[0107] The following is an example of the low voltage detection unit having the function of applying low voltage to the power battery and performing potential equalization detection on the external metal structure during the process of applying low voltage to the power battery.

[0108] For example, the low-voltage detection unit may include a low-voltage generation module and a second measurement module. Both the low-voltage generation module and the second measurement module are configured to connect any two detection points on the external metal structure. The low-voltage generation module and the second measurement module are described in further detail below.

[0109] The low-voltage generation module can apply low-voltage direct current between any two detection points. Optionally, this direct current can be generated by the low-voltage generation module itself, or it can be converted from electrical signals provided by other power supply units into low-voltage direct current and then applied to the power battery. This application does not limit this. Optionally, the low voltage can be related to safe power use requirements, which is not limited in this application.

[0110] By using direct current, the low-voltage generation module can provide a stable current output, avoiding the fluctuations and phase differences caused by alternating current, thereby improving the accuracy and reliability of potential equalization detection.

[0111] Optionally, take the example of the direct current applied by the low-voltage generation module, which is applied to the power battery after converting the electrical signal provided by other power supply units into high-voltage alternating current. The low-voltage generation module may include a transformer and a control circuit. Among them, the transformer can output the constant voltage source as a constant current source, and the control circuit can accurately adjust the parameters of the direct current. Optionally, the low-voltage generation module may also include any one or more items such as a signal amplifier and a fuse resistor. Among them, the signal amplifier can enhance the current signal to ensure stable output, and the fuse resistor can protect the circuit from overload damage. The second measurement module is used to detect whether there is a problem of failing the potential equalization test on the external metal structure when low-voltage direct current is applied between any two detection points. Optionally, the second measurement module can be specifically used to measure the potential difference between any two detection points.

[0112] Optionally, the second measurement module may include a high-impedance measurement circuit for detecting the potential difference between any two detection points. Optionally, the second measurement module may also include any one or more of a built-in amplifier, a filtering and signal conditioning module, and an analog-to-digital converter (A / D converter). The built-in amplifier amplifies the signal, the filtering and signal conditioning module eliminates noise and improves measurement accuracy, and the A / D converter converts the analog potential difference into a digital signal, which is transmitted to the controller module for processing and display.

[0113] After the second measurement module measures the potential difference between any two detection points, the potential difference between any two detection points can be transmitted to the control unit. The control unit can determine whether the external metal structure has a problem of failing the potential equalization test based on the potential difference between any two detection points.

[0114] Optionally, the control unit can calculate the ratio of the potential difference between any two detection points to the DC current value, thereby obtaining the impedance between any two detection points. This impedance is compared with a preset impedance. If this impedance is greater than the preset impedance, it is determined that the potential equalization test of the external metal structure has failed. If this impedance is less than or equal to the preset impedance, it is determined that the potential equalization test of the external metal structure has passed. Optionally, the preset impedance can be set based on safe electricity use requirements, which is not limited in this application.

[0115] Optionally, the control unit may also compare the potential difference between any two detection points with a preset potential difference. If the potential difference between any two detection points is greater than the preset potential difference, the control unit determines that the external metal structure has failed the potential equalization test. If the potential difference between any two detection points is less than or equal to the preset potential difference, the control unit determines that the external metal structure has passed the potential equalization test. Optionally, the preset potential difference may be set based on safe electricity use requirements, which is not limited in this application.

[0116] In the embodiment of the present application, a low-voltage direct current is applied to the external metal structure of the power battery through a low-voltage generation module in a low-voltage detection unit, and a second measurement module in the low-voltage detection unit is used to perform a potential equalization test on the external metal structure, which can effectively detect the problem of the external metal structure of the power battery failing the potential equalization test.

[0117] As described above, both the high-voltage detection unit and the low-voltage detection unit can convert the electrical signals provided by other power supply units and apply them to the power battery. When the high-voltage detection unit and / or the low-voltage detection unit convert the electrical signals provided by other power supply units, the embodiment of the present application can also provide a power supply unit, which is used to provide an external voltage. Optionally, the high-voltage detection unit and the low-voltage detection unit can share a power supply unit, or each can use a power supply unit, which is not limited in this application.

[0118] Taking the example that the high-voltage detection unit and the low-voltage detection unit share a power supply unit, the detection system of the embodiment of the present application may further include a power supply unit, a first switch unit, and a second switch unit. Figure 2 This is a schematic diagram of another structure of power battery potential detection provided by an embodiment of the present application, such as Figure 2As shown, the power supply unit is connected to the high-voltage detection unit via a first switch unit and to the low-voltage detection unit via a second switch unit. The control unit is also connected to the first switch unit for controlling the operation of the high-voltage detection unit via the first switch unit. The control unit is also connected to the second switch unit for controlling the operation of the low-voltage detection unit via the second switch unit.

[0119] Alternatively, the power supply unit may be any unit capable of providing electrical energy to the potential detection system of the power battery, for example, a constant current source or a battery pack, which is not limited in this application. The first switch unit and the second switch unit may be any unit capable of controlling the access of the high-voltage detection unit and the low-voltage detection unit, for example, a relay.

[0120] In the embodiments of the present application, the power supply unit can provide power to the power battery potential detection system, thereby achieving a stable power supply to the power battery potential detection system. Furthermore, the control unit can control the operation of the high-voltage detection unit and the low-voltage detection unit through the first switch unit and the second switch unit, thereby improving the flexibility and automation level of the detection system.

[0121] On the basis of using the high voltage detection unit, the low voltage detection unit and the control unit to perform potential equalization detection on the external metal structure of the power battery, the control unit of the embodiment of the present application can also configure the high voltage detection unit and the low voltage detection unit to perform potential equalization detection.

[0122] For example, the control unit's potential equalization detection configuration for the high-voltage detection unit may include setting any one or more of the following: the value of the high voltage applied by the high-voltage generation module between the power battery's high-voltage module and the external metal structure, the duration of the high voltage application, etc., to accommodate the needs of different detection scenarios. The control unit's potential equalization detection configuration for the low-voltage detection unit may include setting any one or more of the following: the value of the current applied by the low-voltage generation module to the external metal structure, the duration of the current application, etc.

[0123] The control unit of the embodiment of the present application can flexibly configure the detection parameters of the high-voltage detection unit and the low-voltage detection unit, such as any one or more of the high-voltage value, application time, current value and application time, etc., and can accurately adapt to the requirements of various detection scenarios, thereby improving the accuracy and flexibility of potential equalization detection.

[0124] The detection system of the embodiment of the present application may further include a human-computer interaction unit. The human-computer interaction unit is connected to the control unit, and the human-computer interaction unit can be used to output the potential equalization detection result of the power battery. Exemplarily, the human-computer interaction unit can display the potential equalization detection result of the external metal structure of the power battery through a display screen. For example, it can display that the external metal structure of the power battery has failed the potential equalization detection. The potential equalization detection result of the external metal structure of the power battery can also be displayed by turning on and off the indicator light. For example, when the indicator light is on, it indicates that the external metal structure of the power battery has failed the potential equalization detection. This application does not limit this.

[0125] The human-computer interaction unit may also receive user input for a potential equalization detection configuration. For example, the human-computer interaction unit may receive a user-selected detection type (whether to use a high-voltage detection unit or a low-voltage detection unit). For another example, the display screen of the human-computer interaction unit may receive a user-input for a potential equalization detection configuration. A button on the human-computer interaction unit may also receive user input for a potential equalization detection configuration (any one or more of the high-voltage value, application time, current value, and application time). This application is not limited to this.

[0126] The detection system of the embodiment of the present application realizes the intuitive output of the potential equalization detection results of the external metal structure of the power battery and the flexible reception of user-defined detection configurations through the human-computer interaction unit, which significantly improves the intelligence level of the detection system and the user experience, and ensures the efficient management of the potential detection system of the external metal structure of the power battery.

[0127] The detection system of the embodiment of the present application may also include a safety unit. The safety unit is connected to the control unit, the high-voltage detection unit, and the low-voltage detection unit respectively, and is used to provide safety protection during the potential equalization detection process. Optionally, the safety unit can have multiple built-in safety mechanisms, including any one or more of overcurrent protection, overvoltage protection, and arc detection, to monitor and effectively prevent potential safety hazards in real time. It is also equipped with an emergency stop button to quickly cut off the power supply in an emergency, ensuring the absolute safety of operators and equipment.

[0128] Specifically, the overcurrent protection mechanism monitors the current flowing through the detection system to determine if an abnormality such as an overload or short circuit exists. If the current exceeds a preset safety threshold, the overcurrent protection device immediately activates and takes appropriate protective measures, such as disconnecting the circuit or reducing the current, to prevent the excessive current from damaging the detection system. This protection mechanism uses a current transformer to monitor the current and convert it into a measurable signal. This signal is then compared with a preset threshold, triggering the protection action if the threshold is exceeded.

[0129] Overvoltage protection mechanisms monitor the voltage levels within the detection system's circuits. These mechanisms can be set to a preset safety threshold. When the voltage exceeds this threshold, the overvoltage protection device responds quickly, protecting the power battery and detection system from high voltage shocks by disconnecting the circuit or reducing the voltage. Overvoltage protection mechanisms can be implemented using devices such as circuit breakers, lightning arresters, or overvoltage protectors, which monitor voltage changes in real time and trigger protective actions when necessary.

[0130] The arc detection mechanism monitors the system for arc discharges. Arcing is a gas discharge phenomenon that generates high temperatures, high brightness, and radiation. If not promptly addressed, it can damage cables or even lead to serious consequences such as fire. Arc detection collects current signals and analyzes them in the time and frequency domains. The extracted characteristic parameters are then compared against preset thresholds to determine the presence of an arc. Once an arc is detected, the system immediately implements protective measures such as circuit disconnection to prevent further spread and damage.

[0131] The embodiment of the present application can monitor the power battery potential equalization detection process in full real time through the safety unit, quickly respond to and effectively prevent potential safety hazards, ensure the safety of operators and equipment, and improve the safety performance of the power battery potential detection system.

[0132] The detection system of the embodiment of the present application also includes an electromagnetic shielding unit. The electromagnetic shielding unit is located between the high-voltage detection unit and the low-voltage detection unit and is used to electromagnetically shield the high-voltage detection unit from the low-voltage detection unit. Optionally, the electromagnetic shielding unit can be constructed using a highly conductive, low-magnetic-resistance material (such as copper, aluminum, or a special alloy) to form a continuous shielding layer. The shielding layer is connected to the ground potential using grounding technology, thereby forming an effective electromagnetic barrier that effectively blocks, absorbs, or reflects the electromagnetic field generated by the high-voltage detection unit, thereby protecting the low-voltage detection unit from electromagnetic interference.

[0133] The embodiment of the present application can effectively isolate the electromagnetic field generated by the high-voltage detection unit through the electromagnetic shielding unit, ensuring that the low-voltage detection unit is free from interference, thereby ensuring that the two can accurately perform detection tasks in their respective independent electromagnetic compatibility environments, significantly improving the overall performance of the detection system and the reliability of the results.

[0134] An embodiment of the present application provides a power battery potential detection method, which is applied to a control unit in a power battery potential detection system as described above; the method includes: using high-voltage alternating current through a high-voltage detection unit to perform potential equalization detection on an external metal structure, and using low-voltage direct current through a low-voltage detection unit to perform potential equalization detection on the external metal structure.

[0135] In one embodiment, the control unit can determine whether the external metal structure has a problem of failing the potential equalization test due to poor connection of structural parts based on the leakage current between the high-voltage module and the external metal structure, and the detection results of whether the external metal structure has an arcing phenomenon.

[0136] For example, if the leakage current between the high-voltage module and the external metal structure is within a preset range and the external metal structure exhibits arcing, the control unit determines that the external metal structure has failed the potential equalization test due to poor structural connection. Alternatively, if the leakage current between the high-voltage module and the external metal structure is within a preset range and the external metal structure does not exhibit arcing, the control unit determines that the external metal structure has not failed the potential equalization test due to poor structural connection.

[0137] Optionally, the control unit may further determine that the high voltage generation module of the high voltage detection unit is malfunctioning when the leakage current between the high voltage module and the external metal structure is not within a preset range.

[0138] In one embodiment, the control unit may determine whether the external metal structure has a problem of failing the potential equalization test based on the potential difference between any two test points.

[0139] For example, the control unit may determine the impedance between the arbitrary two detection points based on the potential difference between the arbitrary two detection points and the current of the direct current applied between the arbitrary two detection points by the low-voltage generation module of the low-voltage detection unit; if the impedance is greater than a preset impedance, it is determined that the potential equalization test of the external metal structure has failed; if the impedance is less than or equal to the preset impedance, it is determined that the potential equalization test of the external metal structure has passed.

[0140] Optionally, the detection system further includes: a power supply unit, a first switch unit, and a second switch unit. In this implementation, the control unit can control the high voltage detection unit to operate through the first switch unit, and control the low voltage detection unit to operate through the second switch unit.

[0141] Optionally, the control unit may further configure the high voltage detection unit and / or the low voltage detection unit to perform potential equalization detection.

[0142] The above is a method embodiment of the power battery potential detection method provided in this application. Its implementation principle and technical effects are similar to the description of the control unit part of the aforementioned power battery potential detection system, and this embodiment will not be repeated here.

[0143] Figure 3 This is a schematic diagram of the structure of an electronic device provided by this application. Figure 3As shown, the electronic device 300 provided in this embodiment includes: at least one processor 301 and a memory 302. Optionally, the device 300 also includes a communication component 303. The processor 301, the memory 302 and the communication component 303 are connected via a bus 304.

[0144] During the specific implementation process, at least one processor 301 executes the computer-executable instructions stored in the memory 302, so that the at least one processor 301 performs the above method.

[0145] The specific implementation process of the processor 301 can be found in the above method embodiment. Its implementation principle and technical effects are similar and will not be repeated here in this embodiment.

[0146] In the above embodiments, it should be understood that the processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASICs), etc. A general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in the present invention may be directly executed by a hardware processor or by a combination of hardware and software modules within the processor.

[0147] The memory may include random access memory (RAM) and may also include non-volatile memory (NVM), such as at least one disk storage.

[0148] A bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus. Buses can be categorized as address buses, data buses, and control buses. For ease of illustration, the buses in the drawings of this application are not limited to just one bus or just one type of bus.

[0149] The present application also provides a computer program product, including a computer program, which implements the above method when executed by a processor.

[0150] The present application also provides a computer-readable storage medium, in which computer-executable instructions are stored. When a processor executes the computer-executable instructions, the above method is implemented.

[0151] The readable storage medium may be implemented by any type of volatile or non-volatile memory device, or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The readable storage medium may be any available medium that can be accessed by a general-purpose or special-purpose computer.

[0152] An exemplary readable storage medium is coupled to a processor so that the processor can read information from the readable storage medium and write information to the readable storage medium. Of course, the readable storage medium can also be an integral part of the processor. The processor and the readable storage medium can be located in an application specific integrated circuit (ASIC). Of course, the processor and the readable storage medium can also exist in the device as discrete components.

[0153] The division of units is merely a logical functional division; actual implementations may employ alternative divisions, such as combining or integrating multiple units or components into another system, or omitting or disabling certain features. Furthermore, any direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection between devices or units, either through an interface, electrical, mechanical, or other means.

[0154] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0155] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0156] If a function is implemented as 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 invention, or the portion that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the various embodiments of the method of the present invention. The aforementioned storage medium includes various media that can store program code, such as USB flash drives, mobile hard drives, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical disks.

[0157] Those skilled in the art will appreciate that all or part of the steps in the above-described method embodiments can be implemented using hardware associated with program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments. The aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0158] Finally, it should be noted that those skilled in the art will readily identify other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art not disclosed herein. The present invention is not limited to the precise structure described above and illustrated in the accompanying drawings, and various modifications and variations may be made without departing from the scope thereof. The scope of the present invention is limited solely by the appended claims.

Claims

1. A power battery potential detection system, characterized in that: The detection system includes: a control unit, a high-voltage detection unit, and a low-voltage detection unit; The control unit is connected to the high-voltage detection unit and the low-voltage detection unit respectively, wherein the high-voltage detection unit is used to connect the high-voltage module of the power battery and the external metal structure of the power battery, and the low-voltage detection unit is used to connect any two detection points of the external metal structure; the external metal structure includes: at least two connected structural members; The control unit is configured to perform potential equalization detection on the external metal structure using high voltage alternating current through the high voltage detection unit, and to perform potential equalization detection on the external metal structure using low voltage direct current through the low voltage detection unit.

2. The system according to claim 1, wherein: The high voltage detection unit includes: a high voltage generation module, and a first measurement module; The high voltage generation module and the first measurement module are both used to connect the high voltage module and the external metal structure; The high voltage generation module is used to apply high voltage alternating current between the high voltage module and the external metal structure; The first measurement module is configured to perform potential equalization detection on the external metal structure when a high-voltage alternating current is applied between the high-voltage module and the external metal structure.

3. The system according to claim 2, characterized in that The first measurement module is specifically used to detect the leakage current between the high-voltage module and the external metal structure, and to detect whether the external metal structure has an arcing phenomenon; The control unit is specifically used to determine whether the external metal structure has a problem of failing the potential equalization test due to poor connection of structural parts based on the leakage current between the high-voltage module and the external metal structure, and the detection result of whether the external metal structure has an arcing phenomenon.

4. The system according to claim 3, characterized in that The control unit is specifically used for: If the leakage current between the high-voltage module and the external metal structure is within a preset range and arcing occurs in the external metal structure, it is determined that the external metal structure has failed the potential equalization test due to poor connection of structural parts; Alternatively, when the leakage current between the high-voltage module and the external metal structure is within a preset range and there is no arcing phenomenon in the external metal structure, it is determined that the external metal structure does not have a problem of failing the potential equalization test due to poor connection of structural parts.

5. The system according to claim 4, characterized in that The control unit is further configured to: When the leakage current between the high-voltage module and the external metal structure is not within a preset range, it is determined that the high-voltage generation module is operating abnormally.

6. The system according to claim 1, wherein: The low voltage detection unit includes: a low voltage generation module, and a second measurement module; The low voltage generating module and the second measuring module are both used to connect any two detection points of the external metal structure; The low voltage generating module is used to apply low voltage direct current between any two detection points; The second measurement module is used to detect whether the external metal structure has a problem of failing the potential equalization test when a low-voltage direct current is applied between any two detection points.

7. The system according to claim 6, characterized in that The second measuring module is specifically configured to measure the potential difference between any two detection points; The control unit is specifically configured to determine whether the external metal structure has a problem of failing a potential equalization test based on the potential difference between the arbitrary two detection points.

8. The system according to claim 7, characterized in that The control unit is specifically used for: determining the impedance between the arbitrary two detection points according to the potential difference between the arbitrary two detection points and the current of the direct current; When the impedance is greater than a preset impedance, determining that the potential equalization test of the external metal structure fails; When the impedance is less than or equal to the preset impedance, it is determined that the potential equalization test of the external metal structure has passed.

9. The system according to any one of claims 1 to 8, characterized in that: The detection system further includes: a power supply unit, a first switch unit, and a second switch unit; The power supply unit is connected to the high voltage detection unit through the first switch unit, and is connected to the low voltage detection unit through the second switch unit; The control unit is also connected to the first switch unit, and is used to control the operation of the high-voltage detection unit through the first switch unit; The control unit is connected to the second switch unit and is used to control the low voltage detection unit to operate through the second switch unit.

10. The system according to any one of claims 1 to 8, characterized in that: The control unit is further configured to perform potential equalization detection configuration on the high voltage detection unit and / or the low voltage detection unit.

11. The system according to claim 10, wherein: The detection system further comprises: a human-computer interaction unit; The human-computer interaction unit is connected to the control unit, and the human-computer interaction unit is configured to perform at least one of the following: Outputting a potential equalization detection result of the power battery; Receives user input for potential equalization detection configuration.

12. The system according to claim 10, wherein: The detection system further comprises: a safety unit; The safety unit is connected to the control unit, the high voltage detection unit and the low voltage detection unit respectively, and is used for performing safety protection during the potential equalization detection process.

13. The system according to claim 10, wherein: The detection system further comprises: an electromagnetic shielding unit; The electromagnetic shielding unit is located between the high-voltage detection unit and the low-voltage detection unit, and is used to perform electromagnetic shielding on the high-voltage detection unit and the low-voltage detection unit.

14. A method for detecting the potential of a power battery, characterized in that: The method is applied to a control unit in a power battery potential detection system according to any one of claims 1 to 13; the method comprises: The high voltage detection unit uses high voltage alternating current to perform potential equalization detection on the external metal structure, and the low voltage detection unit uses low voltage direct current to perform potential equalization detection on the external metal structure.

15. An electronic device, characterized in that: include: Memory, processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory, causing the processor to perform the method of claim 14 .

16. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer-executable instructions, which are used to implement the method according to claim 14 when executed by a processor.

17. A computer program product, characterized in that The invention comprises a computer program which, when executed by a processor, implements the method of claim 14 .

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