Method and device for detecting connection status of high-voltage connection point of battery pack

Abstract

The present disclosure provides a battery pack high-voltage connection point connection condition detection method and device, the battery pack includes: a battery and an inductor, the method includes: controlling the battery pack to enter a self-heating process, detecting current characteristic information of a loop current between the battery and the inductor in the self-heating process, and detecting connection condition information of a high-voltage connection point in the battery pack according to the current characteristic information. By implementing the method of the present disclosure, the comprehensiveness of the high-voltage bus connection condition detection can be effectively improved, and the connection condition detection effect is improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of vehicles, and particularly relates to a connection condition detection method and device for a high-voltage connection point of a battery pack. BACKGROUND

[0002] In a power battery, there are mainly four connection modes for high-voltage busbars, including welding, screwing, crimping and plugging. In the case of high-voltage safety failure of the power battery, most of them are caused by the loosening and breaking of the high-voltage connection point. Therefore, it is necessary to effectively detect the connection condition of the high-voltage connection point in the battery pack.

[0003] In the related art, the temperature at the connection point of the high-voltage busbar is detected by a negative temperature coefficient (NTC) thermistor. When the connection is loose, the heat generated at the connection point increases, causing the temperature to rise. If the temperature is higher than the set value, it can be considered that the connection is loose.

[0004] In this way, the connection condition detection of the high-voltage busbar has limitations, resulting in poor connection condition detection effect. SUMMARY

[0005] The present disclosure aims to at least partially solve one of the technical problems in the related art.

[0006] To this end, one purpose of the present disclosure is to provide a connection condition detection method and device for a high-voltage connection point of a battery pack, a vehicle and a storage medium, which can effectively improve the comprehensiveness of the connection condition detection of the high-voltage busbar and improve the connection condition detection effect.

[0007] To achieve the above purpose, the connection condition detection method for a high-voltage connection point of a battery pack provided by the first aspect of the present disclosure includes a battery and an inductor, and the method includes: controlling the battery pack to enter a self-heating process; detecting current characteristic information of a loop current between the battery and the inductor in the self-heating process; and detecting connection condition information of a high-voltage connection point in the battery pack according to the current characteristic information.

[0008] The connection condition detection method for a high-voltage connection point of a battery pack provided by the first aspect of the present disclosure controls the battery pack to enter a self-heating process, detects current characteristic information of a loop current between the battery and the inductor in the self-heating process, and detects connection condition information of a high-voltage connection point in the battery pack according to the current characteristic information, which can effectively improve the comprehensiveness of the connection condition detection of the high-voltage busbar and improve the connection condition detection effect.

[0009] To achieve the above object, the battery pack high-voltage connection point connection condition detection device provided by the second aspect of the present disclosure includes a battery and an inductor, and the device includes a control module configured to control the battery pack to enter a self-heating process; a first detection module configured to detect current characteristic information of a loop current between the battery and the inductor during the self-heating process; and a second detection module configured to detect connection condition information of a high-voltage connection point in the battery pack according to the current characteristic information.

[0010] The battery pack high-voltage connection point connection condition detection device provided by the second aspect of the present disclosure can effectively improve the comprehensiveness of the connection condition detection of the high-voltage bus and improve the connection condition detection effect by controlling the battery pack to enter a self-heating process, detecting current characteristic information of a loop current between the battery and the inductor during the self-heating process, and detecting connection condition information of a high-voltage connection point in the battery pack according to the current characteristic information.

[0011] The vehicle provided by the third aspect of the present disclosure includes the battery pack high-voltage connection point connection condition detection device provided by the second aspect of the present disclosure, a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the battery pack high-voltage connection point connection condition detection method provided by the first aspect of the present disclosure when executing the program.

[0012] The non-transitory computer readable storage medium provided by the fourth aspect of the present disclosure stores a computer program, and the program implements the battery pack high-voltage connection point connection condition detection method provided by the first aspect of the present disclosure when executed by a processor.

[0013] The computer program product provided by the fifth aspect of the present disclosure includes instructions executable by a processor to perform the battery pack high-voltage connection point connection condition detection method provided by the first aspect of the present disclosure.

[0014] The additional aspects and advantages of the present disclosure will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0015] The above-mentioned and / or additional aspects and advantages of the present disclosure will become apparent and easily understood from the following description of the embodiments, in conjunction with the accompanying drawings, in which:

[0016] Figure 1 is a flowchart of a battery pack high-voltage connection point connection condition detection method provided by an embodiment of the present disclosure;

[0017] Figure 2 is a discharge diagram of a self-heating process in an embodiment of the present disclosure;

[0018] Figure 3 is a charging schematic diagram of a self-heating process in an embodiment of the present disclosure;

[0019] Figure 4 is a high-frequency pulse current schematic diagram when the battery pack enters the self-heating process;

[0020] Figure 5 is a flow schematic diagram of a connection condition detection method of a high-voltage connection point of a battery pack according to another embodiment of the present disclosure;

[0021] Figure 6 is a flow schematic diagram of a connection condition detection method of a high-voltage connection point of a battery pack according to another embodiment of the present disclosure;

[0022] Figure 7 is a structural schematic diagram of a connection condition detection device of a high-voltage connection point of a battery pack according to an embodiment of the present disclosure;

[0023] Figure 8 is a structural schematic diagram of a vehicle according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0024] Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present disclosure, and cannot be understood as a limitation of the present disclosure. On the contrary, the embodiments of the present disclosure include all changes, modifications and equivalents falling within the spirit and scope of the appended claims.

[0025] Figure 1 is a flow schematic diagram of a connection condition detection method of a high-voltage connection point of a battery pack according to an embodiment of the present disclosure.

[0026] It should be noted that the execution subject of the connection condition detection method of the high-voltage connection point of the battery pack in the present embodiment is a connection condition detection device of the high-voltage connection point of the battery pack, which can be realized by software and / or hardware, and the device can be configured in a terminal device.

[0027] The connection condition detection method of the high-voltage connection point of the battery pack in the present embodiment can be applied to a terminal device. The terminal device is a device that transmits data to other devices or receives data from other devices via a communication facility, that is, the terminal device can be, for example, a smartphone, a portable computer, a vehicle-mounted device, etc. that can perform network communication connection, and this is not limited.

[0028] The embodiments of the present disclosure are mainly applied to the fault scene of loose, broken and the like of the high-voltage connection point in the battery pack, can timely and effectively detect the connection state of the high-voltage connection point in the battery pack, and timely warn the detection personnel, reminding the detection personnel to repair the vehicle as soon as possible to avoid subsequent high-voltage safety hazards.

[0029] The battery pack in the embodiments of the present disclosure includes a battery and an inductor, and the battery pack high-voltage connection point connection state detection method provided in the embodiments of the present disclosure can detect the current characteristics of the loop current between the battery and the inductor when the battery pack is in the battery self-heating process, and effectively detect the connection state of the battery pack high-voltage connection point based on the detected current characteristic information.

[0030] The battery self-heating process is to apply a high-frequency pulse current such as a square wave, a sine wave and the like to the internal resistance of the battery cell in the battery pack to generate heat from the inside of the battery cell, so as to achieve the effect of heating the battery pack in the case of low temperature. The high-frequency pulse current applied to the battery by the battery self-heating process can directly detect the loose, broken, pin-off and the like of all high-voltage connection points on the high-voltage loop between the battery and the inductor in the battery pack, which can effectively improve the comprehensiveness of the connection state detection of the high-voltage bus and improve the connection state detection effect.

[0031] As shown in Figure 1 , the battery pack high-voltage connection point connection state detection method includes:

[0032] S101: Control the battery pack to enter the self-heating process.

[0033] The self-heating process is described as follows:

[0034] As shown in Figure 2 , the self-heating process is a discharge schematic diagram, by controlling Figure 2 Q1, Q2, Q3 and Q8 bridge arms to be turned on and Q4, Q5, Q6 and Q7 bridge arms to be turned off, the loop current flows in the direction of the arrow, and in the discharge process, the battery in the battery pack discharges to the outside and the inductor charges and stores energy; as shown in Figure 2 , the self-heating process is a charging schematic diagram, by controlling Figure 3 Q1, Q2, Q3 and Q8 bridge arms to be turned off and Q4, Q5, Q6 and Q7 bridge arms to be turned on, the loop current flows in the direction of the arrow, and in the charging process, the inductor discharges to the outside and charges the battery at the same time. Figure 3 Figure 3

[0035] ​​Wherein, when the battery pack enters the self-heating process, a pulse current with a frequency of up to 1000Hz is generated between the battery in the battery pack and the inductor, so as to realize the purpose of heating the battery itself through the internal resistance of the battery. Figure 4 Figure 4 is a schematic diagram of the high-frequency pulse current when the battery pack enters the self-heating process. The high-frequency pulse current will oscillate at high frequency between the battery and the inductor, and repeatedly charge and discharge. The single cycle of charge and discharge may be, for example, 1ms, and is not limited thereto.

[0036] S102: Detect the current characteristic information of the loop current between the battery and the inductor in the self-heating process.

[0037] In the embodiment of the present disclosure, when the battery pack enters the self-heating process, the current characteristic of the loop current between the battery and the inductor in the self-heating process can be detected to obtain the current characteristic information. The current characteristic information can be used to describe the change of the loop current between the battery and the inductor, the current instantaneous characteristic, and the like, and is not limited thereto.

[0038] It can be understood that when a high-voltage connection point in the battery pack has a fault such as loosening, breaking, or pin disconnection, a circuit will be broken or the loop resistance will increase. This change will cause the high-frequency pulse current to disappear or the pulse current to decrease. Therefore, in the embodiment of the present disclosure, the current characteristic information of the loop current between the battery and the inductor in the self-heating process can be dynamically detected, and the connection status of the high-voltage connection point in the battery pack can be analyzed based on the current characteristic information.

[0039] S103: Detect the connection status information of the high-voltage connection point in the battery pack according to the current characteristic information.

[0040] The information used to describe the connection status of the high-voltage connection point can be referred to as connection status information. The connection status information may be, for example, normal connection, abnormal connection, loose connection, and the like, and is not limited thereto.

[0041] For example, some determination rules can be set. If the detected current characteristic information meets the determination rules, it can be determined that the connection status of the high-voltage connection point in the battery pack has a fault. If the detected current characteristic information does not meet the determination rules, it can be determined that the connection status of the high-voltage connection point in the battery pack does not have a fault, and is not limited thereto.

[0042] For example, a pre-trained detection model can also be set. The current characteristic information can be input into the pre-trained detection model to detect the connection status information of the high-voltage connection point in the battery pack.

[0043] ​Of course, other any possible ways can also be adopted to realize the connection status information of the high-voltage connection point in the battery pack according to the current characteristic information, such as engineering methods, circuit simulation modeling methods, etc., and no limitation is made to this.

[0044] In this embodiment, by controlling the battery pack to enter the self-heating process, detecting the current characteristic information of the loop current between the battery and the inductor in the self-heating process, and detecting the connection status information of the high-voltage connection point in the battery pack according to the current characteristic information, the comprehensiveness of the connection status detection of the high-voltage bus can be effectively improved, and the connection status detection effect can be improved.

[0045] Figure 5 is a flowchart of a battery pack high-voltage connection point connection status detection method according to another embodiment of the present disclosure.

[0046] As Figure 5 shown, the battery pack high-voltage connection point connection status detection method comprises:

[0047] S501: Control the battery pack to enter the self-heating process.

[0048] The description of S501 can be referred to the above-mentioned embodiments, which will not be repeated here.

[0049] S502: Detect the current amplitude of the loop current at each time point in the self-heating process.

[0050] That is to say, in the embodiment of the present disclosure, a detection time period can be set, such as 1 minute, and within the 1 minute, a plurality of detection time points can be determined, such as every 1 second, and the current amplitude at the corresponding detection time point can be detected, and then a plurality of current amplitudes can be obtained.

[0051] S503: Determine the amplitude variation and variation trend between the plurality of current amplitudes.

[0052] S504: Take the amplitude variation and variation trend as the current characteristic information.

[0053] After the current amplitude at the corresponding detection time point is detected, and then a plurality of current amplitudes are obtained, the variation between the plurality of current amplitudes (the variation can be referred to as the amplitude variation) can be analyzed, and the variation trend of the current amplitude (such as increasing or decreasing) can be analyzed, and the analyzed amplitude variation and variation trend can be taken as the current characteristic information.

[0054] S505: If the variation trend indicates that the current amplitude decreases, and the amplitude variation is greater than or equal to the amplitude variation threshold, it is determined that the connection status information of the high-voltage connection point in the battery pack does not meet the detection index.

[0055] It can be understood that when a high-voltage connection point in the battery pack fails in loosening, pulling off, pin pulling off, etc., a circuit breaker or a large loop resistance will occur, and this change will cause the high-frequency pulse current to disappear or decrease. Therefore, in the embodiments of the present disclosure, a magnitude change threshold can be set, a change trend is set as a comparison reference, and then if the change trend indicates that the current amplitude decreases and the magnitude change is greater than or equal to the magnitude change threshold, it indicates that the high-frequency pulse current disappears or decreases, and it can be determined that the connection status information of the high-voltage connection point in the battery pack does not meet the detection index, and the detection index can indicate that the connection status of the high-voltage connection point in the battery pack fails.

[0056] S506: If the change trend indicates that the current amplitude increases or the magnitude change is less than the magnitude change threshold, it is determined that the connection status information of the high-voltage connection point in the battery pack meets the detection index.

[0057] If the change trend indicates that the current amplitude increases or the magnitude change is less than the magnitude change threshold, it indicates that the high-frequency pulse current does not disappear or decrease, and it can be determined that the connection status information of the high-voltage connection point in the battery pack meets the detection index, and the detection index can indicate that the connection status of the high-voltage connection point in the battery pack does not fail.

[0058] It should be noted that the current amplitude of the loop current between the battery and the inductor is usually smooth and has a certain period during the self-heating process, so if the change trend indicates that the current amplitude increases, it may be due to other related factors of the applied high-frequency pulse current (such as device factors of the applied high-frequency pulse current, etc.), and it is not necessarily due to the connection status of the high-voltage connection point in the battery pack. Therefore, if the change trend indicates that the current amplitude decreases and the magnitude change is greater than or equal to the magnitude change threshold, it is usually caused by the connection status of the high-voltage connection point in the battery pack, which can ensure accurate identification of the failure of the connection status of the high-voltage connection point in the battery pack.

[0059] In this embodiment, by controlling the battery pack to enter the self-heating process, detecting the current characteristic information of the loop current between the battery and the inductor in the self-heating process, and detecting the connection state information of the high-voltage connection point in the battery pack according to the current characteristic information, the comprehensiveness of the connection state detection of the high-voltage bus can be effectively improved, and the connection state detection effect is improved. By detecting the current amplitude of the loop current at each time point in the self-heating process, and determining the amplitude variation and variation trend between the plurality of current amplitudes, and taking the amplitude variation and variation trend as the current characteristic information, the current characteristic of the loop current between the battery and the inductor is accurately detected. If the variation trend indicates that the current amplitude decreases, and the amplitude variation is greater than or equal to the amplitude variation threshold, it is determined that the connection state information of the high-voltage connection point in the battery pack does not meet the detection index. If the variation trend indicates that the current amplitude increases, or the amplitude variation is less than the amplitude variation threshold, it is determined that the connection state information of the high-voltage connection point in the battery pack meets the detection index, which improves the accuracy of the connection state detection, and also avoids increasing the hardware cost of the connection state detection.

[0060] Figure 6 is a flow diagram of a battery pack high-voltage connection point connection state detection method according to another embodiment of the present disclosure.

[0061] As shown in Figure 6 , the battery pack high-voltage connection point connection state detection method comprises the following steps.

[0062] S601: Control the battery pack to enter the self-heating process.

[0063] The description of S601 can refer to the above-mentioned embodiments, which will not be repeated here.

[0064] S602: Detect the current amplitude of the loop current at the nearest time point in the self-heating process, wherein the nearest time point is the nearest detection time point from the current time point, and the detection time point is used to trigger detection.

[0065] S603: Take the current amplitude as the current characteristic information.

[0066] That is, in the embodiments of the present disclosure, the current amplitude of the loop current can be detected based on a certain detection period, and the current amplitude detected in each detection period can be saved. When saving, the corresponding detection time point can be marked. Then when determining the current to be detected, the current amplitude of the loop current at the nearest time point from the current time point in the self-heating process can be directly obtained, and the current amplitude can be taken as the current characteristic information.

[0067] S604: If the current amplitude is less than or equal to the amplitude threshold, it is determined that the connection state information of the high-voltage connection point in the battery pack does not meet the detection index.

[0068] It is understandable that when a high-voltage connection point in the current loop of the battery pack experiences a fault such as loosening, breakage, or pin detachment, an open circuit or increased loop resistance will occur. This change will cause the high-frequency pulse current to disappear or decrease. Therefore, in this embodiment, an amplitude threshold can be set as a comparison reference. If the current amplitude is less than or equal to the amplitude threshold, it indicates that the high-frequency pulse current has disappeared or decreased. This indicates that the connection status of the high-voltage connection point in the battery pack does not meet the detection criteria. Failure to meet the detection criteria indicates a fault in the connection status of the high-voltage connection point in the battery pack.

[0069] S605: If the current amplitude is greater than the amplitude threshold, then the connection status information of the high-voltage connection point in the battery pack is determined to meet the detection index.

[0070] If the current amplitude is greater than the amplitude threshold, it indicates that the high-frequency pulse current has not disappeared or decreased. This means that the connection status of the high-voltage connection point in the battery pack meets the detection criteria. Meeting the detection criteria indicates that there is no fault in the connection status of the high-voltage connection point in the battery pack.

[0071] In this embodiment, by controlling the battery pack to enter a self-heating process and detecting the current characteristics of the loop current between the battery and the inductor during the self-heating process, and by detecting the connection status information of the high-voltage connection points in the battery pack based on the current characteristics, the comprehensiveness and effectiveness of the connection status detection of the high-voltage bus can be effectively improved. By detecting the current amplitude of the loop current at the most recent time point during the self-heating process, where the most recent time point is the detection time point closest to the current time point, and the detection time point is used to trigger the detection, using the current amplitude as current characteristic information can effectively improve the detection efficiency of the current amplitude. Furthermore, the reference current amplitude is the current amplitude corresponding to the detection time point closest to the current time point, which has high reference value, thereby improving the detection accuracy. By determining that the connection status information of the high-voltage connection points in the battery pack does not meet the detection criteria when the current amplitude is less than or equal to the amplitude threshold, and determining that the connection status information of the high-voltage connection points in the battery pack meets the detection criteria when the current amplitude is greater than the amplitude threshold, the accuracy of the connection status detection is improved, and the hardware cost of connection status detection can be avoided.

[0072] Figure 7 This is a schematic diagram of the structure of a battery pack high-voltage connection point connection status detection device according to an embodiment of this disclosure.

[0073] like Figure 7 As shown, the battery pack high-voltage connection point connection status detection device 70 includes:

[0074] The control module 701 is configured to control the battery pack to enter a self-heating process.

[0075] The first detection module 702 is configured to detect current characteristic information of a loop current between the battery and the inductor in the self-heating process.

[0076] The second detection module 703 is configured to detect, according to the current characteristic information, connection state information of a high-voltage connection point in the battery pack.

[0077] In some embodiments of the present disclosure, the first detection module 702 is specifically configured to:

[0078] detect a current amplitude of the loop current at each time point in the self-heating process;

[0079] determine an amplitude variation and a variation trend between the plurality of current amplitudes;

[0080] determine the amplitude variation and the variation trend as the current characteristic information.

[0081] In some embodiments of the present disclosure, the second detection module 703 is specifically configured to:

[0082] if the variation trend indicates that the current amplitude decreases and the amplitude variation is greater than or equal to an amplitude variation threshold, determine that the connection state information of the high-voltage connection point in the battery pack is that the connection state does not meet the detection index;

[0083] if the variation trend indicates that the current amplitude increases or the amplitude variation is less than the amplitude variation threshold, determine that the connection state information of the high-voltage connection point in the battery pack is that the connection state meets the detection index.

[0084] In some embodiments of the present disclosure, the first detection module 702 is further configured to:

[0085] detect a current amplitude of the loop current at a latest time point in the self-heating process, wherein the latest time point is a detection time point closest to a current time point, and the detection time point is used to trigger detection;

[0086] determine the current amplitude as the current characteristic information.

[0087] In some embodiments of the present disclosure, the second detection module 703 is further configured to:

[0088] if the current amplitude is less than or equal to an amplitude threshold, determine that the connection state information of the high-voltage connection point in the battery pack is that the connection state does not meet the detection index;

[0089] if the current amplitude is greater than the amplitude threshold, determine that the connection state information of the high-voltage connection point in the battery pack is that the connection state meets the detection index.

[0090] Corresponding to the battery pack high-voltage connection point connection condition detection method provided by the above-mentioned Figures 1 to 6 Corresponding to the battery pack high-voltage connection point connection condition detection method provided by the above-mentioned Figures 1 to 6 Corresponding to the battery pack high-voltage connection point connection condition detection method provided by the above-mentioned

[0091] In the embodiment, by controlling the battery pack to enter the self-heating process, detecting the current characteristic information of the loop current between the battery and the inductor in the self-heating process, and detecting the connection condition information of the high-voltage connection point in the battery pack according to the current characteristic information, the comprehensiveness of the high-voltage bus connection condition detection can be effectively improved, and the connection condition detection effect is improved.

[0092] In order to realize the above-mentioned embodiment, the present disclosure further proposes a vehicle 80, as shown in Figure 8 , wherein Figure 8 is a structural schematic diagram of the vehicle in the embodiment of the present disclosure, comprising: a battery pack high-voltage connection point connection condition detection device 70, a processor 1101, a memory 1102, and a computer program stored in the memory and executable on the processor, and when the processor executes the program, the battery pack high-voltage connection point connection condition detection method proposed by the above-mentioned embodiment of the present disclosure is realized.

[0093] Corresponding to the battery pack high-voltage connection point connection condition detection method provided by the above-mentioned Figures 1 to 6 Corresponding to the battery pack high-voltage connection point connection condition detection method provided by the above-mentioned Figures 1 to 6 Corresponding to the battery pack high-voltage connection point connection condition detection method provided by the above-mentioned

[0094] In order to realize the above-mentioned embodiment, the present disclosure further proposes a non-transitory computer readable storage medium, which stores a computer program, and when the processor executes the program, the battery pack high-voltage connection point connection condition detection method proposed by the above-mentioned embodiment of the present disclosure is realized.

[0095] In order to realize the above-mentioned embodiment, the present disclosure further proposes a computer program product, when the processor in the computer program product executes, the battery pack high-voltage connection point connection condition detection method proposed by the above-mentioned embodiment of the present disclosure is executed.

[0096] Those skilled in the art will readily understand that the disclosure is well adapted to carry out the objects and obtain the ends and advantages mentioned, as well as those inherent therein, and that the embodiments described herein are illustrative of the way in which the disclosure can be practiced. The disclosure is therefore to be considered as in all respects indicative and illustrative only. The true scope of the disclosure is indicated by the appended claims.

[0097] It should be understood that the present disclosure is not limited to the precise construction hereinafter described and as shown in the attached drawings, and that changes can be made to the exact construction and arrangement of parts without departing from the scope of the present disclosure. The scope of the present disclosure is limited only by the claims appended hereto.

[0098] It should be noted that in the description of the present disclosure, the terms "first", "second", and the like, are used only to describe the purpose and do not indicate or imply relative importance. In addition, in the description of the present disclosure, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0099] Any process or method descriptions or descriptions of the flow diagrams described herein, or otherwise described herein, can be understood as representing the steps of any one or more of the methods for performing the specified logical function or process carried out in the process, and the scope of the preferred embodiments of the present disclosure includes additional implementations that can carry out the function or process in a different order, including using a different sequence of steps, or including process steps not explicitly described or discussed herein. The various steps or methods described herein can be understood as being performed by any one or more of the components of the systems described herein, or by any other component or structure as appropriate.

[0100] It should be understood that various parts of the present disclosure can be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, and as in another embodiment, it can be implemented using any one or a combination of the following technologies known in the art: discrete logic circuit with logic gates for implementing logical functions on data signals, application specific integrated circuit with appropriate combination logic gates, programmable gate array (PGA), field programmable gate array (FPGA), etc.

[0101] Those skilled in the art can understand that all or part of the steps carried out by the above-described embodiments can be completed by programs instructing relevant hardware, and the programs can be stored in a computer readable storage medium, which includes one or a combination of the steps of the method embodiments when executed.

[0102] In addition, each functional unit in each embodiment of the present disclosure can be integrated in one processing module, or each unit can be physically present separately, or two or more units can be integrated in one module. The integrated module can be realized in the form of hardware or in the form of a software functional module. When the integrated module is realized in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer readable storage medium.

[0103] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0104] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0105] Although the embodiments of the present disclosure have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present disclosure, and those of ordinary skill in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present disclosure.

Claims

1. A method for detecting the connection status of a high-voltage connection point in a battery pack, characterized in that, The battery pack includes a battery and an inductor. The method is applied to fault scenarios where high-voltage connection points inside the battery pack become loose, broken, or detached. The method includes: A high-frequency pulse current is generated between the battery and the inductor in the battery pack to control the battery pack to enter the self-heating process; The high-frequency pulse current characteristics of the loop current between the battery and the inductor during the self-heating process are detected. Based on the high-frequency pulse current characteristic information, the connection status information of the high-voltage connection point in the battery pack is detected, and the connection status information includes normal connection, abnormal connection, and loose connection. The high-frequency pulse current characteristic information of detecting the loop current between the battery and the inductor during the self-heating process includes: The current amplitude of the circuit current at various time points during the self-heating process is detected; Determine the magnitude and trend of change among the multiple current amplitudes; The amplitude change and trend are used as the characteristic information of the high-frequency pulse current.

2. The method as described in claim 1, characterized in that, The step of detecting the connection status information of the high-voltage connection point in the battery pack based on the high-frequency pulse current characteristic information includes: If the trend indicates a decrease in current amplitude, and the change in amplitude is greater than or equal to the amplitude change threshold, then it is determined that the connection status information of the high-voltage connection point in the battery pack does not meet the detection criteria. If the trend indicates an increase in current amplitude, or if the change in amplitude is less than the amplitude change threshold, then it is determined that the connection status information of the high-voltage connection point in the battery pack meets the detection criteria.

3. The method as described in claim 1, characterized in that, The high-frequency pulse current characteristic information of detecting the loop current between the battery and the inductor during the self-heating process includes: The current amplitude of the circuit current at the most recent time point during the self-heating process is detected, wherein the most recent time point is the detection time point closest to the current time point, and the detection time point is used to trigger the detection; The current amplitude is used as the characteristic information of the high-frequency pulse current.

4. The method as described in claim 3, characterized in that, The step of detecting the connection status information of the high-voltage connection point in the battery pack based on the high-frequency pulse current characteristic information includes: If the current amplitude is less than or equal to the amplitude threshold, then the connection status information of the high-voltage connection point in the battery pack is determined to be that the connection status does not meet the detection index. If the current amplitude is greater than the amplitude threshold, then it is determined that the connection status information of the high-voltage connection point in the battery pack meets the detection index.

5. A device for detecting the connection status of a high-voltage connection point in a battery pack, characterized in that, The battery pack includes a battery and an inductor. The device is used in scenarios where high-voltage connection points inside the battery pack become loose, broken, or detached. The device includes: A control module is used to generate a high-frequency pulse current between the battery and the inductor in the battery pack to control the battery pack to enter the self-heating process; The first detection module is used to detect the high-frequency pulse current characteristics of the loop current between the battery and the inductor during the self-heating process. The second detection module is used to detect the connection status information of the high-voltage connection point in the battery pack based on the high-frequency pulse current characteristic information. The connection status information includes normal connection, abnormal connection, and loose connection. The first detection module is specifically used for: The current amplitude of the circuit current at various time points during the self-heating process is detected; Determine the magnitude and trend of change among the multiple current amplitudes; The amplitude change and trend are used as the characteristic information of the high-frequency pulse current.

6. The apparatus as claimed in claim 5, characterized in that, The second detection module is specifically used for: If the trend indicates a decrease in current amplitude, and the change in amplitude is greater than or equal to the amplitude change threshold, then it is determined that the connection status information of the high-voltage connection point in the battery pack does not meet the detection criteria. If the trend indicates an increase in current amplitude, or if the change in amplitude is less than the amplitude change threshold, then it is determined that the connection status information of the high-voltage connection point in the battery pack meets the detection criteria.

7. The apparatus as claimed in claim 5, characterized in that, The first detection module is further configured to: The current amplitude of the circuit current at the most recent time point during the self-heating process is detected, wherein the most recent time point is the detection time point closest to the current time point, and the detection time point is used to trigger the detection; The current amplitude is used as the characteristic information of the high-frequency pulse current.

8. The apparatus as claimed in claim 7, characterized in that, The second detection module is also used for: If the current amplitude is less than or equal to the amplitude threshold, then the connection status information of the high-voltage connection point in the battery pack is determined to be that the connection status does not meet the detection index. If the current amplitude is greater than the amplitude threshold, then it is determined that the connection status information of the high-voltage connection point in the battery pack meets the detection index.

9. A vehicle, characterized in that, include: The battery pack high-voltage connection point connection status detection device according to any one of claims 5-8.

10. The vehicle as claimed in claim 9, characterized in that, Also includes: processor; Memory used to store processor-executable instructions; The processor is configured as follows: The steps of implementing the method according to any one of claims 1-4.

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