Battery pack, battery pack output pole connection abnormality detection method and related device

Abstract

The present disclosure relates to a battery pack, a battery pack output pole connection abnormality detection method and related equipment, and relates to the technical field of vehicles. The battery pack comprises a direct current constant current source, a voltage sampling unit, a battery pack and a control module. The direct current constant current source and the voltage sampling unit are connected to both sides of the connection of two conductive connectors of the output pole of the battery pack. The direct current constant current source is used to provide a test current for the connection. The voltage sampling unit is used to collect the voltage value of the connection. The control module is used to determine whether the connection is abnormal based on the size of the test current and the voltage value. Through the above technical means, the problems of low connection state detection accuracy and inability to monitor when the vehicle is not started in the related art are solved.

Description

Technical Field

[0001] This disclosure relates to the field of vehicle technology, and in particular to a method and related equipment for detecting abnormalities at the output terminal connection of a battery pack or battery assembly. Background Technology

[0002] The power battery management system of new energy vehicles is connected to high-voltage loads such as the vehicle's electric drive system via a high-voltage output terminal, serving as the core hub for power transmission. This output terminal connection is typically secured with copper-aluminum busbars and bolts, and its reliability directly impacts the high-voltage safety of the entire vehicle. During vehicle operation, this connection is subjected to continuous vibration, thermal cycling, and high-current impacts, making it prone to loosening or contact degradation, potentially leading to localized overheating or even thermal runaway. To ensure vehicle safety, the condition of this connection must be monitored. Summary of the Invention

[0003] To overcome the problems existing in the related technologies, this disclosure provides a method and related equipment for detecting abnormalities at the output terminal connection of a battery pack or battery assembly.

[0004] According to a first aspect of the present disclosure, a battery pack is provided, the battery pack including a DC constant current source, a voltage sampling unit, a battery pack, and a control module; the DC constant current source and the voltage sampling unit are both connected to both sides of the connection point of two conductive connectors at the output terminal of the battery pack; the DC constant current source is used to provide a test current to the connection point; the voltage sampling unit is used to collect the voltage value at the connection point; the control module is used to determine whether the connection point is abnormal based on the magnitude of the test current and the voltage value.

[0005] This embodiment solves the problems in related technologies by incorporating a DC constant current source and a voltage sampling unit into the battery pack. These problems include the time difference between the collected voltage and current values, which leads to low accuracy in calculation results, and the inability to monitor the status of the battery pack output terminal connection only during vehicle charging or discharging, while monitoring is not possible when the vehicle is not running.

[0006] In some exemplary embodiments, the two conductive connectors are connected by fasteners.

[0007] This embodiment connects two conductive connectors with fasteners to ensure good contact between the two conductive connectors and reduce the contact resistance at the connection point.

[0008] According to a second aspect of the present disclosure, a method for detecting anomalies at the output terminal connection of a battery pack is provided, applied to a vehicle. The vehicle includes a battery pack, which includes a DC constant current source, a voltage sampling unit, and a battery assembly. Both the DC constant current source and the voltage sampling unit are connected to both sides of the connection point of two conductive connectors at the output terminal of the battery assembly. The method includes: controlling the output current of the DC constant current source at a first moment and using the voltage sampling unit to collect a first voltage value at the connection point; controlling the output current of the DC constant current source at a second moment and using the voltage sampling unit to collect a second voltage value at the connection point; and determining whether the connection point is abnormal based on the first voltage value, the second voltage value, and the magnitude of the current.

[0009] This embodiment, by incorporating a DC constant current source and voltage sampling unit within the battery pack, reduces calculation errors caused by the time difference between voltage and current acquisition in related technologies, thereby significantly improving the accuracy of single-time resistance calculations. Simultaneously, since the excitation current is provided by the DC constant current source, it does not rely on the charging and discharging current of the vehicle's main circuit; therefore, the measurement process is completely independent of the vehicle's operating state, enabling monitoring of the vehicle when it is not running or is stationary.

[0010] In some exemplary embodiments, determining whether a connection is abnormal based on a first voltage value, a second voltage value, and the magnitude of the current includes: determining a first resistance value at the connection based on the first voltage value and the magnitude of the current; determining a second resistance value at the connection based on the second voltage value and the magnitude of the current; determining the rate of change of impedance based on the first resistance value, the second resistance value, a first time moment, and a second time moment; and determining whether a connection is abnormal based on the first resistance value, the second resistance value, and the rate of change of impedance.

[0011] In this embodiment, based on the magnitude of the first voltage value, the second voltage value, and the current, the first resistance value, the second resistance value, and the impedance change rate are calculated, thereby determining whether the connection is abnormal and improving the accuracy of connection abnormality detection.

[0012] In some exemplary embodiments, the determination of whether a connection is abnormal is based on a first resistance value, a second resistance value, and an impedance change rate, including at least one of the following: when the first resistance value and / or the second resistance value is greater than a first threshold, the connection is determined to be loose; when the first resistance value and / or the second resistance value is less than or equal to the first threshold and the impedance change rate is greater than a second threshold, the connection is determined to be loose; when the first resistance value and / or the second resistance value is less than or equal to the first threshold and the impedance change rate is less than or equal to the second threshold, the connection is determined to be not loose.

[0013] This embodiment can take into account both situations where the resistance value exceeds the standard and the resistance rises rapidly, thereby improving the detection coverage and early identification capability of loose states at the output terminal connection of the battery pack.

[0014] In some exemplary embodiments, the method further includes: acquiring a third voltage value at the connection point using a voltage sampling unit before a first time point; acquiring a fourth voltage value at the connection point using a voltage sampling unit before a second time point; and determining whether the connection point is abnormal based on the first voltage value, the third voltage value, the second voltage value, the fourth voltage value, and the magnitude of the current.

[0015] This embodiment, by incorporating a built-in DC constant current source and voltage sampling unit in the battery pack, reduces calculation errors caused by the time difference between voltage and current acquisition in related technologies, thereby significantly improving the accuracy of single-time resistance calculation. Simultaneously, a voltage change rate parameter is introduced to quantify the severity of background voltage fluctuations, thus assessing whether a short circuit exists at the connection point.

[0016] In some exemplary embodiments, determining whether a connection is abnormal based on a first voltage value, a third voltage value, a second voltage value, a fourth voltage value, and the magnitude of the current includes: determining a first resistance value based on the first voltage value, the third voltage value, and the magnitude of the current; determining a second resistance value based on the second voltage value, the fourth voltage value, and the magnitude of the current; determining the rate of change of impedance based on the first resistance value, the second resistance value, a first time point, and a second time point; determining the rate of change of voltage based on the third voltage value, the fourth voltage value, the first time point, and the second time point; and determining whether a connection is abnormal based on the first resistance value, the second resistance value, the rate of change of impedance, and the rate of change of voltage.

[0017] In this embodiment, based on the first voltage value, the third voltage value, the second voltage value, the fourth voltage value, and the magnitude of the current, the first resistance value, the second resistance value, the impedance change rate, and the voltage change rate are calculated, thereby determining whether the connection is abnormal and improving the accuracy of connection abnormality detection.

[0018] In some exemplary embodiments, the abnormality of a connection is determined based on a first resistance value, a second resistance value, an impedance change rate, and a voltage change rate, including at least one of the following: when the first resistance value and / or the second resistance value is greater than a first threshold, the connection is determined to be loose; when the first resistance value and / or the second resistance value is less than or equal to the first threshold and the impedance change rate is greater than a second threshold, the connection is determined to be loose; when the first resistance value and / or the second resistance value is less than or equal to the first threshold, the impedance change rate is less than or equal to the second threshold, and the voltage change rate is greater than a third threshold, the connection is determined to be short-circuited; when the first resistance value and / or the second resistance value is less than or equal to the first threshold, the impedance change rate is less than or equal to the second threshold, and the voltage change rate is less than or equal to the third threshold, the contact impedance at the connection is determined to be neither loose nor short-circuited.

[0019] This embodiment can cover both loose and short circuit fault modes, thereby significantly improving the comprehensiveness and accuracy of abnormal detection at the battery pack output terminal connection.

[0020] In some exemplary embodiments, determining a first resistance value based on a first voltage value, a third voltage value, and the magnitude of the current includes: determining a first difference between the first voltage value and the third voltage value; determining a ratio between the first difference and the magnitude of the current, and using the ratio as the first resistance value.

[0021] This embodiment improves the accuracy of the calculation of the first resistance value.

[0022] In some exemplary embodiments, determining a second resistance value based on a second voltage value, a fourth voltage value, and the magnitude of the current includes: determining a second difference between the second voltage value and the fourth voltage value; and determining a ratio between the second difference and the magnitude of the current, using this ratio as the second resistance value.

[0023] This embodiment improves the accuracy of calculating the second resistance value.

[0024] In some exemplary embodiments, determining the rate of change of impedance based on a first resistance value, a second resistance value, a first time moment, and a second time moment includes: determining the resistance difference between the first resistance value and the second resistance value; determining the time difference between the first time moment and the second time moment; and determining the ratio of the resistance difference to the time difference, using this ratio as the rate of change of impedance.

[0025] This embodiment can convert the resistance change at the connection point into the rate of change per unit time, thereby improving the efficiency of impedance change rate calculation.

[0026] In some exemplary embodiments, the voltage change rate is determined based on a third voltage value, a fourth voltage value, a first time moment, and a second time moment, including: determining a third difference between the third voltage value and the fourth voltage value; determining the time difference between the first time moment and the second time moment; and determining the ratio of the resistance difference to the time difference, using this ratio as the voltage change rate.

[0027] This embodiment can convert voltage changes at the connection point into a rate of change per unit time, thereby improving the efficiency of voltage change rate calculation.

[0028] In some exemplary embodiments, the method further includes issuing an alarm message when an anomaly is determined at the connection point.

[0029] This embodiment ensures vehicle safety and avoids safety accidents such as thermal runaway or vehicle power failure.

[0030] In some exemplary embodiments, the method further includes disconnecting the relay of the battery pack if a short circuit is determined at the connection.

[0031] This embodiment can immediately disconnect the battery pack relay when a short circuit is confirmed at the connection point, cutting off the fault current path at the physical level, effectively preventing serious safety accidents such as arcing, melting, and thermal runaway caused by short circuits, and ensuring the safety of the vehicle and the user.

[0032] According to a third aspect of the present disclosure, a battery pack output terminal connection abnormality detection device is provided. The device is installed on a vehicle, the vehicle including a battery pack, the battery pack including a DC constant current source, a voltage sampling unit and a battery assembly. The DC constant current source and the voltage sampling unit are both connected to both sides of the connection of two conductive connectors at the battery pack output terminal. The device includes: a acquisition module configured to control the output current of the DC constant current source at a first moment and acquire a first voltage value at the connection using the voltage sampling unit; the acquisition module is further configured to control the output current of the DC constant current source at a second moment and acquire a second voltage value at the connection using the voltage sampling unit; and a determination module configured to determine whether the connection is abnormal based on the first voltage value, the second voltage value and the magnitude of the current.

[0033] In some exemplary embodiments, the apparatus further includes: a first determining unit configured to determine a first resistance value at the connection based on a first voltage value and the magnitude of a current; the first determining unit is further configured to determine a second resistance value at the connection based on a second voltage value and the magnitude of a current; a second determining unit configured to determine an impedance change rate based on the first resistance value, the second resistance value, a first time moment, and a second time moment; and a third determining unit configured to determine whether the connection is abnormal based on the first resistance value, the second resistance value, and the impedance change rate.

[0034] In some exemplary embodiments, the apparatus further includes: an acquisition module further configured to acquire a third voltage value at the connection point using a voltage sampling unit before a first time point; an acquisition module further configured to acquire a fourth voltage value at the connection point using a voltage sampling unit before a second time point; and a determination module further configured to determine whether the connection point is abnormal based on the first voltage value, the third voltage value, the second voltage value, the fourth voltage value, and the magnitude of the current.

[0035] In some exemplary embodiments, the determining module further includes: a first determining unit further configured to determine a first resistance value based on a first voltage value, a third voltage value, and the magnitude of the current; a first determining unit further configured to determine a second resistance value based on a second voltage value, a fourth voltage value, and the magnitude of the current; a second determining unit configured to determine an impedance change rate based on the first resistance value, the second resistance value, a first time point, and a second time point; a fourth determining unit configured to determine a voltage change rate based on a third voltage value, a fourth voltage value, a first time point, and a second time point; and a third determining unit further configured to determine whether the connection is abnormal based on the first resistance value, the second resistance value, the impedance change rate, and the voltage change rate.

[0036] According to a fourth aspect of the present disclosure, a vehicle is provided, comprising: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to: implement the method of any embodiment of the first aspect.

[0037] According to a fifth aspect of the present disclosure, a non-transitory computer-readable storage medium is provided, which, when instructions in the storage medium are executed by a processor of an electronic device, enables the electronic device to perform the method of any of the embodiments of the first aspect described above.

[0038] This embodiment solves the problems in related technologies, such as the time difference between the collected voltage and current values, which leads to low accuracy of calculation results, and the inability to monitor the state of the battery pack output terminal connection only during vehicle charging or discharging, and the inability to monitor when the vehicle is not running, by incorporating a DC constant current source and a voltage sampling unit into the battery pack.

[0039] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0040] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0041] Figure 1 This is a flowchart illustrating a method for detecting anomalies at the output terminal connection of a battery pack, according to some embodiments of this disclosure.

[0042] Figure 2 This is a flowchart illustrating another method for detecting anomalies at the output terminal connection of a battery pack, according to some embodiments of this disclosure.

[0043] Figure 3 This is a flowchart illustrating another method for detecting anomalies at the output terminal connection of a battery pack, according to some embodiments of the present disclosure.

[0044] Figure 4 This is a flowchart illustrating another method for detecting anomalies at the output terminal connection of a battery pack, according to some embodiments of this disclosure.

[0045] Figure 5 This is a flowchart illustrating another method for detecting anomalies at the output terminal connection of a battery pack, according to some embodiments of this disclosure.

[0046] Figure 6 This is a flowchart illustrating another method for detecting anomalies at the output terminal connection of a battery pack, according to some embodiments of this disclosure.

[0047] Figure 7 This is a schematic diagram illustrating the connection relationship at the output terminal of a battery pack according to some embodiments of this disclosure.

[0048] Figure 8 This is a block diagram illustrating an abnormality detection device at the output terminal connection of a battery pack, according to some embodiments of the present disclosure.

[0049] Figure 9 This is a block diagram illustrating a determining module according to some embodiments of the present disclosure.

[0050] Figure 10 This is a block diagram illustrating another determining module according to some embodiments of the present disclosure.

[0051] Figure 11 This is a block diagram illustrating a vehicle according to an exemplary embodiment. Detailed Implementation

[0052] Some embodiments of this disclosure will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. Various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will become apparent upon understanding this disclosure. For example, the order of operations described herein is merely illustrative and is not limited to those orders set forth herein, but can be changed as will become apparent upon understanding this disclosure, except for operations that must be performed in a particular order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0053] The embodiments described in the following examples of this disclosure are not representative of all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0054] To facilitate understanding, the following is an explanation of several terms used in this disclosure: CMU (Cell Monitoring Unit): This is a low-level data acquisition and local processing module deployed at the module or cell level in the battery pack. It is responsible for collecting key parameters such as voltage and temperature of individual cells in real time, performing preliminary data verification and anomaly screening, and uploading valid information to the upper-level management unit. At the same time, it can receive and execute equalization control commands, providing a high-precision and high-reliability raw data foundation for the safety monitoring and state estimation of the battery pack system.

[0055] BMS (Battery Management System): A core electronic system that is part of the battery pack and is used to monitor, manage and protect the battery pack in real time. Its main functions include collecting parameters such as voltage, current and temperature, performing equalization management, thermal management and fault diagnosis and safety protection to ensure the safe, efficient and long-life operation of the battery.

[0056] DCCS (Direct Current Constant Source) is a power supply device that can output a stable and adjustable DC current. Its output current does not fluctuate with changes in load impedance. In battery pack connection detection, it is used as an excitation source to inject a known constant current, so that the voltage drop generated at the connection is determined only by its own resistance, thus providing a reliable electrical reference for accurate calculation of contact resistance.

[0057] Figure 1 This is a flowchart illustrating a method for detecting anomalies at the output terminal connection of a battery pack, according to some embodiments of this disclosure. The method is applied to a vehicle, which includes a battery pack comprising a DC constant current source, a voltage sampling unit, and a battery assembly. Both the DC constant current source and the voltage sampling unit are connected to both sides of the connection point of two conductive connectors at the output terminal of the battery assembly.

[0058] The connection point of the battery pack output terminal is the physical and electrical connection node between the battery pack's external high-voltage interface and the external high-voltage wiring harness. It is used to safely and stably transmit the high-voltage electrical energy formed by the series and parallel connection of the battery cells inside the battery pack to the high-voltage load of the vehicle.

[0059] like Figure 1 As shown, in some embodiments, the battery pack output terminal connection anomaly detection method provided in this disclosure may include the following steps.

[0060] S101 controls the output current of the DC constant current source at the first moment and uses the voltage sampling unit to collect the first voltage value at the connection point.

[0061] As an example, the first voltage value is the potential difference between the two ends of the battery pack output terminal connection, which is collected by the voltage sampling unit at the first moment.

[0062] In related technologies, when monitoring the connection status, the voltage signal is acquired by the cell monitoring unit (CMU), and then the CMU transmits the voltage signal to the battery management system (BMS) of the battery pack. The current signal used is the battery pack current, which is directly acquired by the BMS, so there is a time difference between acquiring the current signal and the voltage signal. In this embodiment, when monitoring the connection status, at the first moment, the DC constant current source outputs a current signal (current) of a fixed magnitude, and simultaneously the voltage sampling unit acquires the first voltage value (voltage signal) at the connection. Because both the DC constant current source and the voltage sampling unit are built into the battery pack, and the DC constant current source outputs a fixed current, the current does not need to be acquired, thus reducing the time difference between obtaining the first voltage value and the current magnitude.

[0063] Furthermore, the existing technologies can only monitor the status of the battery pack output terminal connection during vehicle charging or discharging, while this embodiment has a built-in DC constant current source in the battery pack, which can output current even when the vehicle is not running.

[0064] S102 controls the output current of the DC constant current source at the second moment and uses the voltage sampling unit to collect the second voltage value at the connection point.

[0065] As an example, the second voltage value is the potential difference between the two ends of the battery pack output terminal connection, which is collected by the voltage sampling unit at the second moment.

[0066] In this embodiment, when monitoring the status of the connection, the DC constant current source outputs a current signal (current) of a fixed magnitude at the second moment, while the voltage sampling unit collects the second voltage value (voltage signal) at the connection. Since both the DC constant current source and the voltage sampling unit are built into the battery pack, and the output current of the DC constant current source is fixed, the current does not need to be collected, thus reducing the time difference between obtaining the second voltage value and the magnitude of the current.

[0067] S103 determines whether the connection is abnormal based on the first voltage value, the second voltage value, and the magnitude of the current.

[0068] In this embodiment, a built-in DC constant current source is used to actively inject excitation current while simultaneously acquiring voltage signals. This ensures that the voltage and current values ​​in each measurement strictly correspond to the same moment, reducing calculation errors caused by time differences in voltage and current acquisition in related technologies, thereby significantly improving the accuracy of single-measurement resistance calculations. Furthermore, since the excitation current is actively provided by the DC constant current source and does not depend on the charging and discharging current of the vehicle's main circuit, the measurement process is completely independent of the vehicle's operating state, enabling monitoring even when the vehicle is not running or is stationary. In addition, by introducing an impedance change rate parameter, combining the static resistance value with the dynamic degradation trend, progressive loosening at the connection caused by vibration or thermal cycling can be identified more accurately, thereby reducing the false positive rate.

[0069] Optionally, this embodiment is applicable to situations where the vehicle is stationary, not started, or not in motion.

[0070] like Figure 2 As shown, in some embodiments, the battery pack output terminal connection anomaly detection method provided in this disclosure may include the following steps.

[0071] Optionally, this embodiment is applicable to situations where the vehicle is stationary, not started, or not in motion.

[0072] S201, based on the first voltage value and the magnitude of the current, determine the first resistance value at the connection point; As an example, the first resistance value is the equivalent contact resistance value at the battery pack output terminal connection at the first moment, used to characterize the electrical conduction state at the connection at the first moment.

[0073] In this embodiment, based on Ohm's law, the ratio of the first voltage value to the current value is calculated to obtain the first resistance value. This embodiment can reduce the time difference between obtaining the first voltage value and the current value, thus improving the accuracy of calculating the first resistance value at the connection point.

[0074] S202, based on the second voltage value and the magnitude of the current, determine the second resistance value at the connection point; As an example, the second resistance value is the equivalent contact resistance value at the battery pack output terminal connection at the second moment, used to characterize the electrical conduction state at the connection at the second moment.

[0075] This embodiment calculates the ratio of the second voltage value to the current value based on Ohm's law to obtain the second resistance value. Because the time difference between obtaining the second voltage and current values ​​is smaller than in related technologies, this embodiment improves the accuracy of calculating the second resistance value at the connection point.

[0076] S203, determine the rate of change of impedance based on the first resistance value, the second resistance value, the first time moment, and the second time moment; As an example, the rate of change of impedance characterizes how quickly the resistance value at the output terminal connection of the battery pack changes over time, and can reflect the deterioration trend or loosening speed of the contact condition at the connection.

[0077] In some exemplary embodiments, determining the rate of change of impedance based on a first resistance value, a second resistance value, a first time moment, and a second time moment includes: determining the resistance difference between the first resistance value and the second resistance value; determining the time difference between the first time moment and the second time moment; and determining the ratio of the resistance difference to the time difference, using this ratio as the rate of change of impedance.

[0078] In this embodiment, the resistance difference between the first and second resistance values ​​is calculated, the time difference between the second and first moments is calculated, and the ratio of the resistance difference to the time difference is calculated to obtain the impedance change rate. By using the above techniques, the resistance change at the connection point can be converted into a rate of change per unit time, improving the efficiency of impedance change rate calculation.

[0079] In an alternative embodiment, the rate of change of impedance is calculated according to the following formula. : (1) Among them, R t1 R is the first resistance value. t2 The second resistance value is given, t1 is the first moment, and t2 is the second moment.

[0080] S204, based on the first resistance value, the second resistance value, and the rate of change of impedance, determines whether the connection is abnormal.

[0081] In this embodiment, the first resistance value and the second resistance value can be compared with an impedance threshold, and the impedance change rate can be compared with an impedance change rate threshold. If both the first resistance value and the second resistance value are less than or equal to the impedance threshold, and the impedance change rate is less than or equal to the impedance change rate threshold, it is determined that there is no abnormality at the connection. This improves the accuracy of connection anomaly detection.

[0082] In some exemplary embodiments, the determination of whether a connection is abnormal is based on a first resistance value, a second resistance value, and an impedance change rate, including at least one of the following: when the first resistance value and / or the second resistance value is greater than a first threshold, the connection is determined to be loose; when the first resistance value and / or the second resistance value is less than or equal to the first threshold and the impedance change rate is greater than a second threshold, the connection is determined to be loose; when the first resistance value and / or the second resistance value is less than or equal to the first threshold and the impedance change rate is less than or equal to the second threshold, the connection is determined to be not loose.

[0083] As an example, loosening is a fault condition at the connection where the contact resistance increases or the rate of resistance change is abnormal due to factors such as reduced bolt preload, oxidation of the contact surface, or mechanical wear. Loosening at the connection reduces connection reliability and may lead to overheating risks.

[0084] As an example, the first threshold is the impedance threshold when the bolt at the connection is loose. If the resistance value is greater than the first threshold, the bolt at the connection is determined to be loose.

[0085] As an example, the second threshold is the impedance change rate threshold when the bolt at the connection is loose. If the impedance change rate is greater than the second threshold, the bolt at the connection is determined to be loose.

[0086] In this embodiment, the logic for determining whether a connection is abnormal adopts a hierarchical discrimination strategy: First, it checks whether the first resistance value and / or the second resistance value are greater than a first threshold. If so, the connection is directly determined to be loose. If both the first resistance value and / or the second resistance value are less than or equal to the first threshold, it further checks whether the impedance change rate is greater than the second threshold. If so, the connection is determined to be loose. If both the first resistance value and / or the second resistance value are less than or equal to the first threshold and the impedance change rate is less than or equal to the second threshold, the connection is determined to be not loose. This is because when the contact resistance has significantly exceeded the safety boundary (first threshold), it indicates that the connection is in a clear fault state, and there is no need to analyze the trend of resistance value change to confirm the abnormality. However, when the contact resistance is still within the normal range, the resistance value alone cannot distinguish between a healthy connection and an early deterioration connection. In this case, it is necessary to use the impedance change rate to capture the trend of rapid resistance increase, thereby providing an early warning before the fault occurs. Through the above technical means, both cases of excessive resistance value and rapid resistance increase can be taken into account, thereby improving the detection coverage and early identification capability of loose states at the battery pack output terminal connection.

[0087] like Figure 3 As shown, in some embodiments, the battery pack output terminal connection anomaly detection method provided in this disclosure may include the following steps.

[0088] This embodiment is applicable to vehicle start-up or driving conditions.

[0089] S301, before the first moment, uses the voltage sampling unit to collect the third voltage value at the connection point.

[0090] As an example, the third voltage value is the potential difference between the two ends of the connection when the DC constant current source is not outputting current before the first moment. It represents the background voltage at the connection when the vehicle is in the starting state and is not affected by the excitation current (when the vehicle is starting, such as during driving, the high voltage current flows through the copper busbar of the battery pack output electrode, and the voltage generated at the connection is generated).

[0091] S302, before the second time step, the fourth voltage value at the connection point is acquired using the voltage sampling unit.

[0092] As an example, the fourth voltage value is the potential difference between the two ends of the connection when the DC constant current source is not outputting current before the second moment, which represents the background voltage at the connection when it is not affected by the excitation current in the vehicle starting state.

[0093] S303 determines whether the connection is abnormal based on the first voltage value, the third voltage value, the second voltage value, the fourth voltage value, and the magnitude of the current.

[0094] This embodiment, by incorporating a built-in DC constant current source and voltage sampling unit in the battery pack, reduces calculation errors caused by the time difference between voltage and current acquisition in related technologies, thereby significantly improving the accuracy of single-time resistance calculation. Simultaneously, a voltage change rate parameter is introduced to quantify the severity of background voltage fluctuations, thus assessing whether a short circuit exists at the connection point.

[0095] like Figure 4 As shown, in some embodiments, the battery pack output terminal connection anomaly detection method provided in this disclosure may include the following steps.

[0096] This embodiment is applicable to vehicle start-up or driving conditions.

[0097] S401 determines the first resistance value based on the first voltage value, the third voltage value, and the magnitude of the current.

[0098] In this embodiment, because a high-voltage current flows through the copper busbar at the output terminal of the battery pack when the vehicle starts, generating a voltage (third voltage value) at the connection point, the first voltage value collected by the DC constant current source output current includes the third voltage value. The first resistance value is obtained by subtracting the third voltage value from the first voltage value and then dividing the voltage difference by the current magnitude. This embodiment reduces the time difference between obtaining the first voltage value and the current magnitude, thus improving the accuracy of calculating the first resistance value at the connection point.

[0099] S402 determines the second resistance value based on the second voltage value, the fourth voltage value, and the magnitude of the current.

[0100] In this embodiment, because a high-voltage current flows through the copper busbar at the output terminal of the battery pack when the vehicle starts, generating a voltage (fourth voltage value) at the connection point, the second voltage value collected by the DC constant current source output current includes the fourth voltage value. The second resistance value is obtained by subtracting the fourth voltage value from the second voltage value and then dividing the voltage difference by the current magnitude. This embodiment reduces the time difference between obtaining the second voltage value and the current magnitude, thus improving the accuracy of calculating the second resistance value at the connection point.

[0101] S403 determines the rate of change of impedance based on the first resistance value, the second resistance value, the first time moment, and the second time moment.

[0102] In some exemplary embodiments, determining the rate of change of impedance based on a first resistance value, a second resistance value, a first time moment, and a second time moment includes: determining the resistance difference between the first resistance value and the second resistance value; determining the time difference between the first time moment and the second time moment; and determining the ratio of the resistance difference to the time difference, using this ratio as the rate of change of impedance.

[0103] In this embodiment, the resistance difference between the first and second resistance values ​​is calculated, the time difference between the second and first moments is calculated, and the ratio of the resistance difference to the time difference is calculated to obtain the impedance change rate. By using the above techniques, the resistance change at the connection point can be converted into a rate of change per unit time, improving computational efficiency.

[0104] In an alternative embodiment, the rate of change of impedance is calculated according to the following formula. : (1) Among them, R t1 R is the first resistance value. t2 The second resistance value is given, t1 is the first moment, and t2 is the second moment.

[0105] S404 determines the rate of voltage change based on the third voltage value, the fourth voltage value, the first time point, and the second time point.

[0106] As an example, the rate of change of voltage is a parameter characterizing how quickly the background voltage at the battery pack output terminal connection changes over time when no excitation current is injected, reflecting the degree of dynamic interference of load fluctuations or harness induced electromotive force on the measurement environment at the connection point during vehicle startup.

[0107] In this embodiment, the voltage difference between the third and fourth voltage values ​​is calculated, the time difference between the second and first moments is calculated, and the ratio of the voltage difference to the time difference is calculated to obtain the voltage change rate. Through the above technical means, the voltage change at the connection point can be converted into a rate of change per unit time, improving computational efficiency.

[0108] S405 determines whether the connection is abnormal based on the first resistance value, the second resistance value, the rate of change of impedance, and the rate of change of voltage.

[0109] In this embodiment, the first resistance value and the second resistance value can be compared with the impedance threshold, the impedance change rate can be compared with the impedance change rate threshold, and the voltage change rate can be compared with the voltage change rate threshold. If the first resistance value and the second resistance value are both less than or equal to the impedance threshold, the impedance change rate is less than or equal to the impedance change rate threshold, and the voltage change rate is less than or equal to the voltage change rate threshold, then it is determined that there is no abnormality at the connection.

[0110] In this embodiment, for the scenario where the vehicle is in the starting state: before controlling the DC constant current source output current at the first moment, a third voltage value at the connection point is first collected using a voltage sampling unit to obtain the background voltage at this time; then, current is injected at the first moment and a first voltage value is collected. The first resistance value is calculated by combining the difference between the first and third voltage values ​​with the current magnitude, thereby eliminating the interference of the background voltage. Similarly, a fourth voltage value is collected before injecting current at the second moment, and a second voltage value is collected at the second moment. The second resistance value is calculated by combining the difference between the second and fourth voltage values ​​with the current magnitude. After obtaining the first and second resistance values, the impedance change rate is calculated. At the same time, the voltage change rate is calculated using the third and fourth voltage values ​​and the time difference between the first and second moments. Finally, by combining the first resistance value, the second resistance value, the impedance change rate, and the voltage change rate, it is determined whether there is an abnormality at the battery pack output terminal connection.

[0111] In this embodiment, when the vehicle starts, the on-board high-voltage load is in operation, and there is a background voltage drop across the battery pack output terminals caused by the load current. This background voltage dynamically changes with fluctuations in load power. If the resistance is calculated directly using the total voltage collected after the excitation current is injected, the background voltage and its fluctuations will be incorrectly included in the contact resistance, leading to distorted calculation results. By pre-collecting the background voltage before each excitation current injection and subtracting it from the resistance calculation, the pure resistance voltage drop generated solely by the excitation current can be accurately extracted, thus ensuring the accuracy of the calculation of the first and second resistance values. Furthermore, a voltage change rate parameter is introduced to quantify the severity of background voltage fluctuations, thereby assessing whether a short circuit exists at the connection (severe background voltage fluctuations may indicate a short circuit at the connection).

[0112] In some exemplary embodiments, the abnormality of a connection is determined based on a first resistance value, a second resistance value, an impedance change rate, and a voltage change rate, including at least one of the following: when the first resistance value and / or the second resistance value is greater than a first threshold, the connection is determined to be loose; when the first resistance value and / or the second resistance value is less than or equal to the first threshold and the impedance change rate is greater than a second threshold, the connection is determined to be loose; when the first resistance value and / or the second resistance value is less than or equal to the first threshold, the impedance change rate is less than or equal to the second threshold, and the voltage change rate is greater than a third threshold, the connection is determined to be short-circuited; when the first resistance value and / or the second resistance value is less than or equal to the first threshold, the impedance change rate is less than or equal to the second threshold, and the voltage change rate is less than or equal to the third threshold, the contact impedance at the connection is determined to be neither loose nor short-circuited.

[0113] As an example, the third threshold is the voltage change rate threshold during a high-voltage short circuit. If the impedance change rate is greater than the third threshold, a short circuit is determined at the connection.

[0114] In this embodiment, it is checked whether the first resistance value and / or the second resistance value are greater than a first threshold. If so, the connection is directly determined to be loose. If both the first resistance value and / or the second resistance value are less than or equal to the first threshold, it is further checked whether the impedance change rate is greater than the second threshold. If so, the connection is determined to be loose. If both the first resistance value and / or the second resistance value are less than or equal to the first threshold and the impedance change rate is less than or equal to the second threshold, it is further checked whether the voltage change rate is greater than a third threshold. If so, the connection is determined to be short-circuited. If both the first resistance value and / or the second resistance value are less than or equal to the first threshold, the impedance change rate is less than or equal to the second threshold, and the voltage change rate is less than or equal to the third threshold, the contact impedance at the connection is determined to be neither loose nor short-circuited. In this embodiment, when a short circuit occurs at the connection, the contact resistance itself may not increase significantly. Therefore, the first resistance value, the second resistance value, and the impedance change rate may all be within the normal range. However, the short circuit will cause the current path of the high-voltage circuit to change or generate a transient arc, thereby causing a violent abnormal fluctuation in the background voltage at the connection, which is manifested as a significant increase in the voltage change rate. By introducing a third threshold to determine the rate of voltage change, detection capabilities can be supplemented by voltage fluctuations when short-circuit faults cannot be identified in the resistance dimension. Through these technical means, both loosening and short-circuit fault modes can be covered, thereby significantly improving the comprehensiveness and accuracy of anomaly detection at the battery pack output terminal connections.

[0115] In some implementations, determining a first resistance value based on a first voltage value, a third voltage value, and the magnitude of the current includes: determining a first difference between the first voltage value and the third voltage value; determining a ratio between the first difference and the magnitude of the current, and using this ratio as the first resistance value.

[0116] In this embodiment, a second difference between the first voltage value and the third voltage value is calculated to eliminate interference from background voltage during vehicle startup and extract the pure resistance voltage drop caused solely by the excitation current. This first difference is then divided by the current magnitude to obtain the first resistance value. This improves the accuracy of the first resistance value calculation.

[0117] In an alternative embodiment, the first resistance value R is calculated according to the following formula. t1 : (2) Among them, U t1 U1 is the first voltage value, U2 is the third voltage value, and I is the magnitude of the current.

[0118] In some exemplary embodiments, determining a second resistance value based on a second voltage value, a fourth voltage value, and the magnitude of the current includes: determining a second difference between the second voltage value and the fourth voltage value; and determining a ratio between the second difference and the magnitude of the current, using this ratio as the second resistance value.

[0119] In this embodiment, a second difference between the second voltage value and the fourth voltage value is calculated to eliminate interference from the background voltage during vehicle startup and extract the pure resistance voltage drop caused solely by the excitation current. This second difference is then divided by the current magnitude to obtain the second resistance value. This improves the accuracy of the second resistance value calculation.

[0120] In an alternative embodiment, the second resistance value R is calculated according to the following formula. t2 : (3) Among them, U t2 U1 is the second voltage value, U2 is the fourth voltage value, and I is the magnitude of the current.

[0121] In some implementations, determining the rate of change of voltage based on a third voltage value, a fourth voltage value, a first time moment, and a second time moment includes: determining a third difference between the third voltage value and the fourth voltage value; determining the time difference between the first time moment and the second time moment; and determining the ratio of the resistance difference to the time difference, using this ratio as the rate of change of voltage.

[0122] In this embodiment, a third difference between the fourth voltage value and the third voltage value is calculated to obtain the change amplitude of the background voltage within the measurement period; then, the time difference between the second moment and the first moment is calculated to determine the time span experienced by the change amplitude; finally, the third difference is divided by the time difference to obtain the voltage change rate. Through the above technical means, the voltage change at the connection point can be converted into the rate of change per unit time, improving the efficiency of voltage change rate calculation.

[0123] In an alternative embodiment, the voltage change rate is calculated according to the following formula. : (4) Where U1 is the third voltage value, U2 is the fourth voltage value, t1 is the first moment, and t2 is the second moment.

[0124] In some exemplary embodiments, the method further includes issuing an alarm message when an anomaly is determined at the connection point.

[0125] In this embodiment, an alarm message is immediately issued when a loose connection or short circuit is detected at the connection point. The content of the alarm message can be differentiated according to the type of abnormality. For example, for a loose connection fault, a tightening maintenance suggestion is given; for a short circuit fault, a high-voltage power-down protection command is triggered to disconnect the battery pack relay. This ensures vehicle safety and avoids safety accidents such as thermal runaway or complete vehicle power failure.

[0126] In some exemplary embodiments, the method further includes disconnecting the relay of the battery pack if a short circuit is determined at the connection.

[0127] In this embodiment, when a short circuit is detected at the connection point, the battery pack relay is immediately disconnected. A short circuit fault can cause a low-impedance path to form in the high-voltage circuit, generating a transient high current far exceeding normal operating conditions. If not disconnected in time, this could lead to catastrophic consequences such as arcing, melting, or even thermal runaway within a very short period. Therefore, the relay must be disconnected simultaneously with the alarm to physically eliminate the fault current path. Through the above technical means, the battery pack relay can be immediately disconnected upon confirmation of a short circuit at the connection point, physically cutting off the fault current path and effectively preventing serious safety accidents such as arcing, melting, and thermal runaway caused by short circuits, thus ensuring the safety of the vehicle and the user.

[0128] like Figure 5 As shown, in some embodiments, the battery pack output terminal connection abnormality detection method provided in this disclosure is applicable to situations where the vehicle is stationary or not started. The vehicle includes a battery pack, which includes a DC constant current source, a voltage sampling unit, and a battery pack. Both the DC constant current source and the voltage sampling unit are connected to both sides of the connection point of the two conductive connectors at the battery pack output terminal.

[0129] The method includes the following steps: S501 controls the output current of the DC constant current source at the first moment and uses the voltage sampling unit to collect the first voltage value at the connection point. S502, based on the first voltage value and the magnitude of the current, determine the first resistance value at the connection point; S503 controls the output current of the DC constant current source at the second moment and uses the voltage sampling unit to collect the second voltage value at the connection point. S504, based on the second voltage value and the magnitude of the current, determines the second resistance value at the connection point; S505, determine whether the first resistance value and / or the second resistance value are less than or equal to the first threshold; S506, if not, confirm that the connection is loose; S507, if so, determine whether the rate of change of impedance is less than or equal to the second threshold; S506, if not, confirm that the connection is loose; S508, if so, make sure the connection is not loose.

[0130] In this embodiment, it is first determined whether the first resistance value and / or the second resistance value exceed a reasonable range to quickly eliminate obvious high-resistance faults. Then, it is further determined whether the impedance change rate exceeds a reasonable range to eliminate early latent faults. Connection points exhibiting early signs of degradation such as fretting wear and oxide film growth often show a situation where the first resistance value and / or the second resistance value are less than or equal to a first threshold, but the impedance change rate is greater than a second threshold.

[0131] like Figure 6As shown, in some embodiments, the battery pack output terminal connection abnormality detection method provided in this disclosure is applicable to situations where the vehicle is in driving or starting. The vehicle includes a battery pack, which includes a DC constant current source, a voltage sampling unit, and a battery pack. Both the DC constant current source and the voltage sampling unit are connected to both sides of the connection point of the two conductive connectors at the battery pack output terminal.

[0132] The method includes the following steps: S601, before the first moment, uses the voltage sampling unit to collect the third voltage value at the connection point; S602 controls the output current of the DC constant current source at the first moment and uses the voltage sampling unit to collect the first voltage value at the connection point. S603, based on the first voltage value, the third voltage value and the magnitude of the current, determines the first resistance value; S604, before the second time step, the fourth voltage value at the connection point is acquired using the voltage sampling unit; S605 controls the output current of the DC constant current source at the second moment and uses the voltage sampling unit to collect the second voltage value at the connection point. S606, based on the second voltage value, the fourth voltage value and the magnitude of the current, determines the second resistance value; S607, based on the first resistance value, the second resistance value, the first time moment, and the second time moment, determine the rate of change of impedance; S608 determines the rate of voltage change based on the third voltage value, the fourth voltage value, the first time moment, and the second time moment; S609, determine whether the first resistance value and / or the second resistance value are less than or equal to the first threshold; S610, if not, check if the connection is loose; S611, if so, determine whether the rate of change of impedance is less than or equal to the second threshold; S610, if not, check if the connection is loose; S612, if so, determine whether the voltage change rate is less than or equal to the third threshold; S613, if so, confirm that there is no looseness or short circuit at the connection point; S614, if not, determine that the connection is short-circuited.

[0133] In this embodiment, the system first determines whether the first resistance value and / or the second resistance value exceed a reasonable range to quickly eliminate obvious high-resistance faults. Secondly, it determines whether the impedance change rate exceeds a reasonable range to eliminate early-stage latent faults. Finally, it determines whether the voltage change rate exceeds a reasonable range to eliminate possible short-circuit faults.

[0134] This disclosure provides a battery pack, which includes a DC constant current source, a voltage sampling unit, a battery pack, and a control module. The DC constant current source and the voltage sampling unit are both connected to the two sides of the connection point of two conductive connectors at the output terminal of the battery pack. The DC constant current source is used to provide a test current to the connection point. The voltage sampling unit is used to collect the voltage value at the connection point. The control module is used to determine whether the connection point is abnormal based on the magnitude of the test current and the voltage value.

[0135] As an example, the conductive connectors are made of copper or aluminum.

[0136] As an example, both the DC constant current source and the voltage sampling unit can be connected to the two sides of the connection point by means of welding, snap-fitting, plugging, screwing, etc.

[0137] This embodiment solves the problems in related technologies by incorporating a DC constant current source and a voltage sampling unit into the battery pack, which result in a time difference between the collected voltage and current values, leading to low accuracy of the calculation results, and the inability to monitor the status of the battery pack output terminal connection only during vehicle charging or discharging, and the inability to monitor when the vehicle is not running.

[0138] In some exemplary embodiments, the two conductive connectors are connected by fasteners.

[0139] As an example, the fastener is a bolt.

[0140] This embodiment connects two conductive connectors with fasteners to ensure good contact between the two conductive connectors and reduce the contact resistance at the connection point.

[0141] like Figure 7 As shown, the battery pack 700 provided in this embodiment includes a DC constant current source 701, a voltage sampling unit 702, a battery pack 703, and a control module 704. The output terminal connection of the battery pack 703 includes two copper busbars, namely copper busbar 7031 and copper busbar 7032, and a fastener 7033. Copper busbar 7031 and copper busbar 7032 are tightly connected by fastener 7033.

[0142] The DC constant current source 701 and the voltage sampling unit 702 are both connected to the two sides of the copper busbar 7031 and the copper busbar 7032.

[0143] This embodiment solves the problems in related technologies by incorporating a DC constant current source and a voltage sampling unit into the battery pack, which result in a time difference between the collected voltage and current values, leading to low accuracy of the calculation results, and the inability to monitor the status of the battery pack output terminal connection only during vehicle charging or discharging, and the inability to monitor when the vehicle is not running.

[0144] Figure 8This is a block diagram illustrating an abnormality detection device at the output terminal connection of a battery pack, according to some embodiments of this disclosure. The device is installed on a vehicle, which includes a battery pack, a DC constant current source, a voltage sampling unit, and a battery assembly. Both the DC constant current source and the voltage sampling unit are connected to both sides of the connection point of two conductive connectors at the output terminal of the battery assembly.

[0145] Reference Figure 8 The abnormality detection device at the battery pack output terminal connection includes: The acquisition module 801 is configured to control the output current of the DC constant current source at the first moment and acquire the first voltage value at the connection point using the voltage sampling unit. The acquisition module 801 is also configured to control the output current of the DC constant current source at the second moment and acquire the second voltage value at the connection point using the voltage sampling unit; The determination module 802 is configured to determine whether the connection is abnormal based on a first resistance value, a second resistance value, and an impedance change rate.

[0146] Figure 9 This is a block diagram illustrating a determining module according to some embodiments of the present disclosure.

[0147] The first determining unit 8021 is configured to determine the first resistance value at the connection point based on the first voltage value and the magnitude of the current. The first determining unit 8021 is also configured to determine the second resistance value at the connection based on the second voltage value and the magnitude of the current. The second determining unit 8022 is configured to determine the impedance change rate based on the first resistance value, the second resistance value, the first time moment, and the second time moment. The third determining unit 8023 is configured to determine whether the connection is abnormal based on the first resistance value, the second resistance value, and the impedance change rate.

[0148] In some embodiments, the third determining unit 8023 is further configured to determine that the connection is loose when the first resistance value and / or the second resistance value is greater than the first threshold; determine that the connection is loose when the first resistance value and / or the second resistance value is less than or equal to the first threshold and the impedance change rate is greater than the second threshold; and determine that the connection is not loose when the first resistance value and / or the second resistance value is less than or equal to the first threshold and the impedance change rate is less than or equal to the second threshold.

[0149] In some embodiments, the acquisition module 801 is further configured to acquire a third voltage value at the connection point using a voltage sampling unit before a first time point; the acquisition module 801 is further configured to acquire a fourth voltage value at the connection point using a voltage sampling unit before a second time point; and the determination module 802 is further configured to determine whether the connection point is abnormal based on the first voltage value, the third voltage value, the second voltage value, the fourth voltage value, and the magnitude of the current.

[0150] Figure 10 This is a block diagram illustrating another determining module according to some embodiments of the present disclosure.

[0151] The first determining unit 8021 is also configured to determine the first resistance value based on the first voltage value, the third voltage value, and the magnitude of the current. The first determining unit 8021 is also configured to determine the second resistance value based on the second voltage value, the fourth voltage value, and the magnitude of the current. The second determining unit 8022 is configured to determine the impedance change rate based on the first resistance value, the second resistance value, the first time moment, and the second time moment. The fourth determining unit 8024 is configured to determine the voltage change rate based on the third voltage value, the fourth voltage value, the first time moment, and the second time moment; The third determining unit 8023 is also configured to determine whether the connection is abnormal based on the first resistance value, the second resistance value, the impedance change rate, and the voltage change rate.

[0152] In some embodiments, the third determining unit 8023 is further configured to: determine that the connection is loose when the first resistance value and / or the second resistance value is greater than a first threshold; determine that the connection is loose when the first resistance value and / or the second resistance value is less than or equal to the first threshold and the impedance change rate is greater than a second threshold; determine that the connection is short-circuited when the first resistance value and / or the second resistance value is less than or equal to the first threshold, the impedance change rate is less than or equal to the second threshold, and the voltage change rate is greater than a third threshold; and determine that the contact impedance at the connection is not loose and there is no short circuit when the first resistance value and / or the second resistance value is less than or equal to the first threshold, the impedance change rate is less than or equal to the second threshold, and the voltage change rate is less than or equal to the third threshold.

[0153] In some embodiments, the first determining unit 8021 is further configured to determine a first difference between a first voltage value and a third voltage value; determine a ratio between the first difference and the magnitude of the current, and use the ratio as a first resistance value.

[0154] In some embodiments, the first determining unit 8021 is further configured to determine a second difference between the second voltage value and the fourth voltage value; determine the ratio of the second difference to the magnitude of the current, and use the ratio as the second resistance value.

[0155] In some embodiments, the fourth determining unit 8024 is further configured to determine a third difference between a third voltage value and a fourth voltage value; determine a time difference between a first time moment and a second time moment; and determine a ratio of the resistance difference to the time difference, using the ratio as the voltage change rate.

[0156] In some embodiments, the determination module is also configured to issue an alarm message if an anomaly is determined at the connection point.

[0157] In some embodiments, the determining module is also configured to disconnect the relay of the battery pack if a short circuit is determined at the connection.

[0158] Regarding the above Figure 8 Figure 9 Figure 10 The specific manner in which the various modules perform their operations in the embodiments of the apparatus have been described in detail in the embodiments relating to the method, and will not be elaborated upon here.

[0159] In some embodiments, an electronic device is also provided, comprising: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to: implement the method of any of the above method embodiments.

[0160] Figure 11 This is a block diagram illustrating a vehicle 1100 according to an exemplary embodiment. For example, vehicle 1100 may be a hybrid vehicle, a non-hybrid vehicle, an electric vehicle, a fuel cell vehicle, or other types of vehicles. Vehicle 1100 may be an autonomous vehicle, a semi-autonomous vehicle, or a non-autonomous vehicle.

[0161] Reference Figure 11 The vehicle 1100 may include various subsystems, such as an infotainment system 1110, a perception system 1120, a decision control system 1130, a drive system 1140, and a computing platform 1150. The vehicle 1100 may also include more or fewer subsystems, and each subsystem may include multiple components. Furthermore, each subsystem and each component of the vehicle 1100 can be interconnected via wired or wireless means.

[0162] In some embodiments, the infotainment system 1110 may include a communication system, an entertainment system, and a navigation system, etc.

[0163] The perception system 1120 may include several types of sensors for sensing information about the environment surrounding the vehicle 1100. For example, the perception system 1120 may include a global positioning system (which may be a GPS system, a BeiDou system, or another positioning system), an inertial measurement unit (IMU), a lidar, a millimeter-wave radar, an ultrasonic radar, and a camera device.

[0164] The decision control system 1130 may include a computing system, a vehicle controller, a steering system, a throttle, and a braking system.

[0165] The drive system 1140 may include components that provide powered motion to the vehicle 1100. In one embodiment, the drive system 1140 may include an engine, an energy source, a transmission system, and wheels. The engine may be one or a combination of internal combustion engines, electric motors, and compressed air engines. The engine is capable of converting energy provided by the energy source into mechanical energy.

[0166] Some or all of the functions of vehicle 1100 are controlled by computing platform 1150. Computing platform 1150 may include at least one processor 1151 and memory 1152, and processor 1151 may execute instructions 1153 stored in memory 1152.

[0167] Processor 1151 can be any conventional processor, such as a commercially available CPU. Processors may also include graphics processing units (GPUs), field-programmable gate arrays (FPGAs), systems-on-chips (SoCs), application-specific integrated circuits (ASICs), or combinations thereof.

[0168] The memory 1152 can be implemented by any type of volatile or non-volatile storage 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.

[0169] In addition to instruction 1153, memory 1152 can also store data, such as road maps, route information, vehicle position, direction, speed, and other data. The data stored in memory 1152 can be used by computing platform 1150.

[0170] In this embodiment of the disclosure, processor 1151 may execute instructions 1153 to perform all or part of the steps of the method in any of the above method embodiments.

[0171] From the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solutions according to the embodiments of this disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, external hard drive, etc.) or on a network, including several instructions to cause a computing device (such as a personal computer, server, terminal device, or network device, etc.) to execute the methods according to the embodiments of this disclosure.

[0172] This disclosure also provides a non-transitory computer-readable storage medium that, when the instructions in the storage medium are executed by the processor of an electronic device, enables the electronic device to perform the methods in any of the above method embodiments.

[0173] Furthermore, the term “exemplary” is used herein to mean serving as an example, instance, or illustration. Any aspect or design described herein as “exemplary” is not necessarily to be construed as advantageous compared to other aspects or designs. Rather, the use of the term “exemplary” is intended to present the concept in a concrete manner. As used herein, the term “or” is intended to mean an inclusive “or” rather than an exclusive “or.” That is, unless otherwise specified or clear from the context, “X applies A or B” is intended to mean any of the natural inclusive arrangements. That is, “X applies A or B” satisfies any of the foregoing instances if X applies A; X applies B; or both X applies A and B. Additionally, unless otherwise specified or clear from the context to refer to the singular form, the articles “a” and “an” as used in this application and the appended claims are generally understood to mean “one or more.”

[0174] Similarly, although this disclosure has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art upon reading and understanding this specification and the accompanying drawings. This disclosure includes all such modifications and variations and is limited only by the scope of the claims. In particular, with respect to the various functions performed by the components described above (e.g., elements, resources, etc.), unless otherwise indicated, the terminology used to describe such components is intended to correspond to any component (functionally equivalent) that performs the specific function of the described component, even if structurally not equivalent to the disclosed structure. Furthermore, although specific features of this disclosure may have been disclosed with respect to only one of several implementations, such features may be combined with one or more other features of other implementations, as may be desired and advantageous to any given or particular application. Moreover, with regard to the terms “comprising,” “owning,” “having,” “having,” or variations thereof as used in the detailed description or claims, such terms are intended to be inclusive in a manner similar to the term “including.”

[0175] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0176] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A battery pack, characterized in that, The battery pack includes a DC constant current source, a voltage sampling unit, a battery pack, and a control module; Both the DC constant current source and the voltage sampling unit are connected to the two conductive connectors at the connection points of the battery pack output terminals. The DC constant current source is used to provide test current at the connection point; The voltage sampling unit is used to collect the voltage value at the connection point; The control module is used to determine whether the connection is abnormal based on the magnitude of the test current and the voltage value.

2. The battery pack according to claim 1, characterized in that, The two conductive connectors are connected by fasteners.

3. A method for detecting abnormalities at the output terminal connection of a battery pack, characterized in that, Applied to a vehicle, the vehicle includes a battery pack, the battery pack including a DC constant current source, a voltage sampling unit, and a battery array, wherein the DC constant current source and the voltage sampling unit are both connected to the two sides of the connection point of two conductive connectors at the output terminal of the battery array, the method includes: The DC constant current source output current is controlled at the first moment, and the first voltage value at the connection point is acquired by the voltage sampling unit. At the second moment, the output current of the DC constant current source is controlled, and the second voltage value at the connection point is acquired using the voltage sampling unit. Based on the first voltage value, the second voltage value, and the magnitude of the current, determine whether the connection is abnormal.

4. The method according to claim 3, characterized in that, The step of determining whether the connection is abnormal based on the first voltage value, the second voltage value, and the magnitude of the current includes: Based on the first voltage value and the magnitude of the current, determine the first resistance value at the connection point; Based on the second voltage value and the magnitude of the current, determine the second resistance value at the connection point; The impedance change rate is determined based on the first resistance value, the second resistance value, the first time moment, and the second time moment. Based on the first resistance value, the second resistance value, and the impedance change rate, it is determined whether the connection is abnormal.

5. The method according to claim 4, characterized in that, The determination of whether the connection is abnormal based on the first resistance value, the second resistance value, and the impedance change rate includes at least one of the following: When the first resistance value and / or the second resistance value are greater than the first threshold, it is determined that the connection is loose. When the first resistance value and / or the second resistance value is less than or equal to the first threshold, and the rate of change of impedance is greater than the second threshold, it is determined that the connection is loose. When the first resistance value and / or the second resistance value are less than or equal to the first threshold, and the impedance change rate is less than or equal to the second threshold, it is determined that the connection is not loose.

6. The method according to claim 3, characterized in that, The method further includes: Before the first moment, the voltage sampling unit is used to collect the third voltage value at the connection point; Before the second moment, the fourth voltage value at the connection point is acquired using the voltage sampling unit; Based on the first voltage value, the third voltage value, the second voltage value, the fourth voltage value, and the magnitude of the current, it is determined whether the connection is abnormal.

7. The method according to claim 6, characterized in that, The step of determining whether the connection is abnormal based on the first voltage value, the third voltage value, the second voltage value, the fourth voltage value, and the magnitude of the current includes: The first resistance value is determined based on the first voltage value, the third voltage value, and the magnitude of the current; The second resistance value is determined based on the second voltage value, the fourth voltage value, and the magnitude of the current; The impedance change rate is determined based on the first resistance value, the second resistance value, the first time moment, and the second time moment. The voltage change rate is determined based on the third voltage value, the fourth voltage value, the first time moment, and the second time moment. Based on the first resistance value, the second resistance value, the impedance change rate, and the voltage change rate, determine whether the connection is abnormal.

8. The method according to claim 7, characterized in that, Determining whether the connection is abnormal based on the first resistance value, the second resistance value, the impedance change rate, and the voltage change rate includes at least one of the following: When the first resistance value and / or the second resistance value are greater than the first threshold, it is determined that the connection is loose. When the first resistance value and / or the second resistance value is less than or equal to the first threshold, and the rate of change of impedance is greater than the second threshold, it is determined that the connection is loose. When the first resistance value and / or the second resistance value is less than or equal to the first threshold, the impedance change rate is less than or equal to the second threshold, and the voltage change rate is greater than the third threshold, a short circuit is determined at the connection. When the first resistance value and / or the second resistance value are less than or equal to the first threshold, the impedance change rate is less than or equal to the second threshold, and the voltage change rate is less than or equal to the third threshold, it is determined that the contact impedance at the connection point is not loose and there is no short circuit.

9. The method according to claim 7, characterized in that, Determining the first resistance value based on the first voltage value, the third voltage value, and the magnitude of the current includes: Determine a first difference between the first voltage value and the third voltage value; Determine the ratio of the first difference to the magnitude of the current, and use this ratio as the first resistance value.

10. The method according to claim 7, characterized in that, Determining the second resistance value based on the second voltage value, the fourth voltage value, and the magnitude of the current includes: Determine a second difference between the second voltage value and the fourth voltage value; Determine the ratio of the second difference to the magnitude of the current, and use this ratio as the second resistance value.

11. The method according to claim 4 or 7, characterized in that, Determining the rate of change of impedance based on the first resistance value, the second resistance value, the first time moment, and the second time moment includes: Determine the resistance difference between the first resistance value and the second resistance value; Determine the time difference between the first moment and the second moment; Determine the ratio of the resistance difference to the time difference, and use this ratio as the impedance change rate.

12. The method according to claim 7, characterized in that, Determining the voltage change rate based on the third voltage value, the fourth voltage value, the first time moment, and the second time moment includes: Determine the third difference between the third voltage value and the fourth voltage value; Determine the time difference between the first moment and the second moment; Determine the ratio of the resistance difference to the time difference, and use this ratio as the voltage change rate.

13. The method according to claim 3, 4, 6 or 7, characterized in that, The method further includes issuing an alarm message when an abnormality is determined at the connection point.

14. The method according to claim 8, characterized in that, The method further includes: disconnecting the relay of the battery pack if a short circuit is determined at the connection.

15. A device for detecting abnormalities at the output terminal connection of a battery pack, characterized in that, The device is installed on a vehicle, which includes a battery pack. The battery pack includes a DC constant current source, a voltage sampling unit, and a battery array. Both the DC constant current source and the voltage sampling unit are connected to the two conductive connectors at the output terminals of the battery array. The acquisition module is configured to control the output current of the DC constant current source at a first moment and acquire the first voltage value at the connection point using the voltage sampling unit; The acquisition module is also configured to control the output current of the DC constant current source at a second moment and acquire the second voltage value at the connection point using the voltage sampling unit; The determination module is configured to determine whether the connection is abnormal based on the first voltage value, the second voltage value, and the magnitude of the current.

16. The apparatus according to claim 15, characterized in that, The determining module further includes: The first determining unit is configured to determine a first resistance value at the connection point based on the first voltage value and the magnitude of the current. The first determining unit is further configured to determine a second resistance value at the connection based on the second voltage value and the magnitude of the current. The second determining unit is configured to determine the impedance change rate based on the first resistance value, the second resistance value, the first time moment, and the second time moment; The third determining unit is configured to determine whether the connection is abnormal based on the first resistance value, the second resistance value, and the impedance change rate.

17. The apparatus according to claim 15, characterized in that, The device further includes: The acquisition module is also configured to acquire a third voltage value at the connection point using the voltage sampling unit before the first moment. The acquisition module is also configured to acquire a fourth voltage value at the connection point using the voltage sampling unit before the second time point; The determining module is further configured to determine whether the connection is abnormal based on the first voltage value, the third voltage value, the second voltage value, the fourth voltage value, and the magnitude of the current.

18. The apparatus according to claim 17, characterized in that, The determining module further includes: The first determining unit is further configured to determine the first resistance value based on the first voltage value, the third voltage value, and the magnitude of the current; The first determining unit is further configured to determine the second resistance value based on the second voltage value, the fourth voltage value, and the magnitude of the current; The second determining unit is configured to determine the impedance change rate based on the first resistance value, the second resistance value, the first time moment, and the second time moment; The fourth determining unit is configured to determine the voltage change rate based on the third voltage value, the fourth voltage value, the first time moment, and the second time moment; The third determining unit is also configured to determine whether the connection is abnormal based on the first resistance value, the second resistance value, the impedance change rate, and the voltage change rate.

19. A vehicle, characterized in that, include: processor; Memory used to store processor-executable instructions; The processor is configured as follows: Implement the method according to any one of claims 3 to 14.

20. A non-transitory computer-readable storage medium, wherein when instructions in the storage medium are executed by a processor of a mobile terminal, the mobile terminal is enabled to perform the method of any one of claims 3 to 14.

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