Current sensor connection loosening detection method and device, and medium

Abstract

The invention discloses a method for detecting loose connection of a current sensor, and the method comprises the following steps: determining a preset temperature threshold which is related to the contact area of the current sensor and an electric connection part and can be used for representing the connection state of the current sensor and the electric connection part; acquiring an actual temperature value of the electric connection part; comparing the actual temperature value with a preset temperature threshold value; and if the actual temperature value is greater than the temperature threshold, sending out loosening early warning information. According to the invention, whether the connection between the electric connection part and the current sensor is loose can be found in time by comparing the real-time temperature value of the electric connection part with the preset temperature threshold determined in advance when loosening occurs, so that the problem of power failure of the whole vehicle caused by disconnection of a battery high-voltage loop is avoided. The invention also discloses a current sensor connection loosening detection device and a medium.

Description

Technical Field

[0001] The present invention relates to the field of current sensors, and in particular to a method, a device and a medium for detecting loose connection of a current sensor. Background Art

[0002] With the popularity and widespread application of new energy vehicles, special attention is also paid to batteries, which are an important component of new energy vehicles. It is often necessary to monitor and control the battery to keep it in a controllable range to ensure its safety performance. The current sensor is a major component related to the battery pack. Generally, the current sensor and the battery pack copper busbar are connected by bolts. During the actual operation of the vehicle, the bolts at the connection between the current sensor and the battery pack copper busbar may become loose during bumps, and loose bolts can easily cause the current sensor to be disconnected from the battery pack copper busbar, causing the power of the entire vehicle to fail. However, there is currently no method that can effectively detect loose connections of current sensors in a timely manner. Summary of the invention

[0003] The purpose of the present invention is to solve the problem that the current technology cannot detect the loosening of the current sensor bolt in time. The present invention provides a detection method for the loose connection of the current sensor, which can detect the loose connection between the current sensor and the electrical connection part in time, and avoid the situation that the high-voltage circuit is disconnected, thereby causing the power failure of the whole vehicle.

[0004] In order to solve the above technical problems, an embodiment of the present invention discloses a method for detecting a loose connection of a current sensor, wherein the current sensor is connected to an electrical connection portion in a battery pack, and the detection method comprises the following steps:

[0005] Determining a preset temperature threshold, where the preset temperature threshold is related to a contact area between the current sensor and the electrical connection portion and can be used to characterize a connection state between the current sensor and the electrical connection portion;

[0006] Determining an actual temperature value of the electrical connection;

[0007] comparing the actual temperature value with a preset temperature threshold;

[0008] Based on the actual temperature value being greater than the temperature threshold, a looseness warning message is issued.

[0009] By adopting the above technical scheme, the relationship between the intermittent change of the copper busbar temperature and the looseness of the connection between the electrical connection part and the current sensor can be judged, that is, the real-time temperature value of the electrical connection part is compared with the preset temperature threshold determined in advance when looseness occurs, so as to timely detect whether the connection between the electrical connection part and the current sensor is loose, thereby avoiding the disconnection of the battery high-voltage circuit, which will cause power failure of the entire vehicle.

[0010] As a specific implementation, determining an actual temperature value of the electrical connection portion, comparing the actual temperature value with a preset temperature threshold, and issuing a loosening warning message based on the actual temperature value being greater than the preset temperature threshold, includes:

[0011] Continuously acquiring actual temperature values ​​of the electrical connection portion for a set number of times, and comparing each acquired actual temperature value with a preset temperature threshold;

[0012] Based on the fact that each actual temperature value obtained is greater than the preset temperature threshold, a looseness warning message is issued.

[0013] As a specific implementation, the number of times is set to 3.

[0014] As a specific implementation, a method for determining a preset temperature threshold includes:

[0015] Determine the test subject;

[0016] Under the condition that the current sensor of the test subject is normally connected to the electrical connection part, current is supplied to the battery pack of the test subject;

[0017] Monitor the temperature of the electrical connection part of the test subject in real time, and switch the connection state between the current sensor of the test subject and the electrical connection part to the test condition when the temperature of the electrical connection part reaches a stable value;

[0018] Current continues to be supplied to the battery pack of the test subject in the test condition, and a preset temperature threshold is obtained based on a temperature value corresponding to a temperature of the electrical connection portion in a stable state under the test condition.

[0019] As a specific implementation, the test conditions include a state where the current sensor is completely out of contact with the electrical connection portion, and a state where the current sensor is only partially in contact with the electrical connection portion;

[0020] Switching the connection state between the current sensor of the test subject and the electrical connection part to the test condition, continuing to supply current to the battery pack of the test subject in the test condition, and obtaining a preset temperature threshold value based on a temperature value corresponding to a stable temperature of the electrical connection part under the test condition, including:

[0021] The current sensor is only partially in contact with the electrical connection part, and current is continuously supplied to the battery pack of the test subject in this state, and a first temperature of the electrical connection part of the test subject in this state is monitored in real time, a temperature value corresponding to a stable state of the first temperature is obtained as a first temperature threshold, and the connection between the current sensor and the electrical connection part is restored to a normal working condition;

[0022] When the temperature of the electrical connection part is in a stable state, the current sensor is completely out of contact with the electrical connection part, and the second temperature of the electrical connection part of the test subject in this state is detected in real time, and the temperature value when the second temperature is in a stable state is obtained as the second temperature threshold;

[0023] The preset temperature threshold is determined based on the first temperature threshold and the second temperature threshold.

[0024] As a specific implementation, determining the preset temperature threshold based on the first temperature threshold and the second temperature threshold includes:

[0025] Determine a first weight coefficient corresponding to a first temperature threshold and a second weight coefficient corresponding to a second temperature threshold;

[0026] The preset temperature threshold is determined based on the product of the first temperature threshold and the first weight coefficient and the product of the second temperature threshold and the second weight coefficient.

[0027] As a specific implementation, the first weight coefficient and the second weight coefficient are determined based on the occurrence probability of the corresponding test conditions and the contact area between the current sensor and the electrical connection portion under the test conditions.

[0028] As a specific implementation, the current sensor and the electrical connection part are connected by bolt connection; the test condition includes that part or all of the current between the current sensor and the electrical connection part flows through the bolt.

[0029] Another embodiment of the present application further discloses a current sensor loose connection detection device, comprising:

[0030] A temperature acquisition module, used to acquire the actual temperature value of the electrical connection part;

[0031] The processing module is used to obtain a preset temperature threshold and an actual temperature value output by the temperature acquisition module, compare the actual temperature value with the preset temperature threshold, and issue a loosening warning message based on the actual temperature value being greater than the preset temperature threshold.

[0032] Another embodiment of the present application further discloses a readable storage medium, on which instructions are stored. When the instructions are executed on an electronic device, the electronic device executes the above-mentioned detection method. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram showing a flow chart of a method for detecting a loose connection of a current sensor according to an embodiment of the present invention;

[0034] Figure 2 A schematic diagram showing a process of determining a preset temperature threshold;

[0035] Figure 3According to some embodiments of the present application, a schematic structural diagram of a system on chip (SOC) is shown. DETAILED DESCRIPTION

[0036] The following specific embodiments illustrate the implementation of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this implementation. On the contrary, the purpose of introducing the invention in conjunction with the implementation is to cover other options or modifications that may extend based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0037] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0038] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0039] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0040] Generally speaking, the current sensor is connected to the battery pack through an electrical connection portion in the battery pack. In one specific embodiment, the electrical connection portion is a copper busbar of the battery pack, and the current sensor is connected to the copper busbar of the battery pack by bolts through the sensor copper busbar extending from both sides thereof. In another specific embodiment, the electrical connection portion is other electrical connection components of the battery pack, and the present application does not limit the electrical connection portion.

[0041] The following will take the copper busbar of the battery pack as an example to describe the solution of the embodiment of the present application in detail:

[0042] The inventors have found that under normal circumstances, when an electric vehicle is running in the same operating condition, the temperature of the copper busbar and the current sensor in the battery pack is stable. When the bolts fixing the sensor become loose, the contact area between the sensor copper busbar and the battery pack copper busbar becomes smaller. When the current remains unchanged, the smaller the area, the higher the heat. Therefore, the temperature of the copper busbar will rise rapidly. In other words, the inventors have found that by judging the relationship between the intermittent change of the copper busbar temperature and the looseness of the connection between the electrical connection and the current sensor, it is possible to promptly detect whether the connection between the current sensor and the electrical connection in the battery pack is loose, thereby avoiding the disconnection of the battery high-voltage circuit, which leads to power failure of the entire vehicle.

[0043] Reference Figure 1 The present application discloses a method for detecting a loose connection of a current sensor, comprising the following steps:

[0044] S101: Determine a preset temperature threshold, where the preset temperature threshold is related to a contact area between the current sensor and the electrical connection portion and can be used to characterize a connection state between the current sensor and the electrical connection portion.

[0045] The power supply current of each different car model is different, corresponding to a different preset temperature threshold. In other words, different car models correspond to different power supply currents. When the connection between the current sensor and the battery pack copper busbar is loose, the temperature rise of the copper busbar is also different. Therefore, each car model needs to simulate the loose connection state of the battery pack copper busbar and the current sensor to obtain its corresponding preset temperature threshold. Furthermore, for the same car model, the contact area between the battery pack copper busbar and the current sensor is different (the degree of looseness is different), and the temperature rise of the battery pack copper busbar is also different. Therefore, the preset temperature threshold is determined based on the different contact areas between the battery pack copper busbar and the current sensor and the probability of occurrence of different contact areas between the battery pack copper busbar and the current sensor.

[0046] S102: Obtain the actual temperature value of the copper busbar of the battery pack.

[0047] In one embodiment of the present application, the actual temperature value of the copper busbar of the battery pack can be measured by a temperature sensor or the like. In another embodiment of the present application, no additional temperature sensor may be provided, but the current sensor of the battery pack may be replaced with a current sensor with a temperature detection function (referred to as a CSM system), and then the actual temperature value of the copper busbar of the battery pack may be collected by the replaced current sensor of the battery pack, so as to reduce the use of electrical components and facilitate the miniaturization of the battery pack system.

[0048] S103: Compare the actual temperature value with a preset temperature threshold.

[0049] The continuously acquired temperature values ​​of the battery pack copper busbar can be compared with the preset temperature thresholds in turn. If the temperature of the battery pack copper busbar suddenly rises at a certain moment, it indicates that an abnormality may have occurred at the connection between the current sensor and the battery pack copper busbar.

[0050] S104: Based on the actual temperature value being greater than the preset temperature threshold, a looseness warning message is issued.

[0051] The actual temperature value is compared with the preset temperature threshold. If the real-time temperature value of the battery pack copper busbar rises to or even exceeds the preset temperature threshold, it indicates that the connection between the current sensor and the battery pack copper busbar may be loose.

[0052] The above steps S101, S103 and S104 can be performed in the BMS system (battery management system). Specifically, the BMS system is connected to the CSM system, and the CSM system uploads the actual temperature value of the detected battery pack to the BMS system in real time, so that the BMS system compares the actual temperature value uploaded in real time with the preset temperature threshold to determine the change in the temperature of the battery pack copper bar, and then promptly discover the looseness of the connection between the battery pack copper bar and the current sensor.

[0053] Furthermore, in a specific embodiment, the actual temperature value of the copper busbar of the battery pack is determined, the actual temperature value is compared with a preset temperature threshold, and a loosening warning message is issued based on the actual temperature value being greater than the preset temperature threshold, including continuously obtaining the actual temperature value of the copper busbar of the battery pack for a set number of times, and comparing each actual temperature value obtained with the preset temperature threshold, and issuing a loosening warning message based on each actual temperature value obtained being greater than the preset temperature threshold.

[0054] Since the occasional increase in the temperature of the copper busbar of the battery pack may be an unexpected situation, in order to avoid misjudgment, it is necessary to determine whether several consecutive actual temperature values ​​are greater than the preset temperature threshold to improve the accuracy of the judgment result. Exemplarily, the number of consecutive comparisons of the actual temperature value is set to 3; that is, among the actual temperature values, if at least three consecutive actual temperature values ​​are greater than the preset temperature threshold, it indicates that the connection between the current sensor and the copper busbar of the battery pack is loose, and an alarm message is issued. It should be noted that the number of consecutive comparisons set in this embodiment is an exemplary explanation and does not limit the technical solution of the present application. The more comparisons are set, the more accurate the judgment result will be. Correspondingly, the time to issue the alarm message will also be delayed, so the specific number of comparisons can be set according to the actual situation.

[0055] Correspondingly, in this specific implementation, it is necessary to collect the actual temperature values ​​of the copper busbar of the battery pack continuously. The collection method includes uninterrupted continuous collection, and can also be continuous collection at fixed intervals. Assuming that the actual temperature values ​​of the copper busbar of the battery pack collected continuously are T1, T2, T3, T4...T. If the temperature value of the continuous set comparison times is greater than the preset temperature threshold, it indicates that the connection between the current sensor and the copper busbar of the battery pack is loose. For example, if the set comparison times are 3, the continuous actual temperature values ​​T, T n+1 When T(n≥1) is greater than the preset temperature threshold, a loosening warning message is issued.

[0056] Furthermore, if the number of times the actual temperature value is greater than the preset temperature threshold does not reach the set comparison number, the result of the actual temperature value being greater than the preset temperature threshold will be counted again. n , T n+1 are greater than the preset temperature threshold, but T n+2 If the actual temperature value is less than the preset temperature threshold, the result that the actual temperature value is greater than the preset temperature threshold is reset to zero, and has no effect on the subsequent number of times the actual temperature value is greater than the preset temperature threshold.

[0057] Further, in step S101, the temperature of the copper bar of the battery pack when the connection between the current sensor and the copper bar of the battery pack is loose is obtained as a preset temperature threshold, referring to Figure 2 , including the following steps:

[0058] S1011: Under the condition that the current sensor of the test subject is connected to the copper busbar of the battery pack normally, current is supplied to the battery pack of the test subject.

[0059] First, before this step, the test subject can be determined according to the target subject (ie, the vehicle type corresponding to the battery pack and current sensor targeted by the looseness detection method).

[0060] Then put the test subject in normal working condition (normal working condition means that there is no loose connection between the current sensor and the copper busbar of the battery pack), and pass current through the test subject. Generally speaking, under normal working condition, the current passed through the battery pack is constant, and the constant current will keep the copper busbar of the battery pack at a stable temperature. That is, under normal working condition, the constant current corresponds to the constant temperature of the copper busbar of the battery pack. In other words, before determining the preset temperature threshold, first simulate the state in which the target subject is driving normally and there is no loose connection between the current sensor and the copper busbar of the battery pack.

[0061] S1012: monitor the temperature of the battery pack copper busbar of the test subject in real time until the temperature of the battery pack copper busbar reaches a stable value, and then switch the connection state between the current sensor of the test subject and the battery pack copper busbar to the test condition.

[0062] After the temperature of the copper busbar of the battery pack of the subject to be tested reaches stability under normal working conditions, the preset temperature threshold is determined under the test working conditions. Specifically, the test working conditions include a state where the current sensor is completely out of contact with the copper busbar of the battery pack, and a state where the current sensor is only partially in contact with the copper busbar of the battery pack.

[0063] In a specific embodiment, the connection between the current sensor and the battery pack copper busbar is a bolt connection, and the test condition includes that the current between the current sensor and the battery pack copper busbar flows partially or completely through the bolt. That is, the connection between the current sensor and the battery pack copper busbar is completely non-contacting or the connection between the current sensor and the battery pack copper busbar is only partially in contact, and all or part of the current needs to be conducted through the bolt.

[0064] S1013: Continue to supply current to the battery pack of the test subject in the test condition, and obtain a preset temperature threshold based on a temperature value corresponding to a stable temperature of the copper busbar of the battery pack under the test condition.

[0065] That is to say, when the temperature of the battery pack copper busbar reaches a stable value, the connection between the current sensor and the battery pack copper busbar becomes loose. The loose connection reduces the contact area between the temperature sensor and the battery pack copper busbar. In this state, continuous current will increase the temperature of the battery pack copper busbar. Since the input current is fixed, the stable value of the battery pack copper busbar temperature after the increase is close to a fixed value. The stabilized temperature value is used as the preset temperature threshold for the vehicle model.

[0066] Further, with respect to the test conditions including the difference in the size of the contact area between the current sensor and the battery pack copper busbar, the step of obtaining the preset temperature threshold value based on the temperature value corresponding to the temperature of the battery pack copper busbar in a stable state under the test conditions includes:

[0067] The current sensor is made to only partially contact with the copper busbar of the battery pack, current is continuously supplied to the battery pack of the test subject in this state, and the first temperature of the copper busbar of the battery pack of the test subject in this state is monitored in real time, and the temperature value corresponding to the first temperature being in a stable state is obtained as the first temperature threshold, and the connection between the current sensor and the copper busbar of the battery pack is restored to normal operating conditions.

[0068] When the temperature of the battery pack copper busbar is in a stable state (the temperature of the battery pack copper busbar will decrease for a period of time after switching to normal operation and remain at the temperature corresponding to normal operating conditions), the current sensor and the battery pack copper busbar are switched to a completely non-contact state, and the second temperature of the battery pack copper busbar of the test subject in this state is detected in real time, and the temperature value when the second temperature is in a stable state is obtained as the second temperature threshold.

[0069] Finally, a preset temperature threshold is determined based on the first temperature threshold and the second temperature threshold.

[0070] Furthermore, in order to characterize the influence of different loose conditions of the current sensor and the copper busbar of the battery pack on the preset temperature threshold, when determining the preset temperature threshold, it also includes weighting the preset temperature threshold obtained under different test conditions. Specifically, determining the preset temperature threshold based on the first temperature threshold and the second temperature threshold also includes: determining a first weight coefficient corresponding to the first temperature threshold, and a second weight coefficient corresponding to the second temperature threshold, and determining the preset temperature threshold based on the product of the first temperature threshold and the first weight coefficient and the product of the second temperature threshold and the second weight coefficient.

[0071] Furthermore, each weight coefficient is determined based on the probability of occurrence of the corresponding test condition and the contact area between the current sensor and the battery pack copper busbar under the test condition.

[0072] For example, under different test conditions, the contact area between the circuit sensor and the battery pack copper busbar is set to 10%, 30%, 50%, 70%, and 90%, respectively, and the corresponding preset temperature thresholds are measured. Then, according to the corresponding probability of occurrence of each test condition in actual conditions, the weight coefficient of each test condition is determined, and the preset temperature threshold is obtained based on the temperature threshold corresponding to each test condition and its corresponding weight coefficient.

[0073] The above method can be used to determine the preset temperature threshold corresponding to the loose connection between the current sensor and the battery pack copper busbar of different vehicle models.

[0074] In summary, the technical solution implemented in this application determines whether the connection between the copper busbar of the battery pack and the current sensor is loose by obtaining the temperature of the copper busbar of the battery pack, so as to timely detect the loose connection of the current sensor and avoid the power failure of the whole vehicle due to the disconnection of the high-voltage circuit. Specifically, if the current sensor and the copper busbar of the battery pack are connected by bolts, the intermittent changes in the temperature of the copper busbar can be used to determine whether the bolts connecting the current sensor and the copper busbar of the battery pack are loose. In this way, if the loose bolts can be detected in time, the problem of power failure of the whole vehicle due to the disconnection of the high-voltage circuit of the battery can be effectively avoided.

[0075] Another embodiment of the present application further discloses a current sensor loose connection detection device, comprising:

[0076] The temperature acquisition module is used to obtain the actual temperature value of the battery pack copper busbar.

[0077] The processing module is used to obtain a preset temperature threshold and an actual temperature value output by the temperature acquisition module, compare the actual temperature value with the preset temperature threshold, and issue a loosening warning message based on the actual temperature value being greater than the preset temperature threshold.

[0078] Another embodiment of the present application further provides a readable storage medium, on which instructions are stored. When the instructions are executed on an electronic device, the electronic device executes the above-mentioned method for detecting a loose connection of a current sensor.

[0079] Reference now Figure 3 , which is a block diagram of a system on chip (SoC) 500 according to an embodiment of the present application. Figure 3 In the FIG, similar components have the same reference numerals. In addition, the dashed boxes are optional features of more advanced SoCs. Figure 3 In the embodiment, SoC 500 includes: an interconnect unit 550, which is coupled to a processor 510; a system agent unit 580; a bus controller unit 590; an integrated memory controller unit 540; a group or one or more coprocessors 520, which may include integrated graphics logic, an image processor, an audio processor, and a video processor; a static random access memory (SRAM) unit 530; and a direct memory access (DMA) unit 560. In one embodiment, the coprocessor 520 includes a special-purpose processor, such as, for example, a network or communication processor, a compression engine, a general-purpose computing on graphics processing units (GPGPU), a high-throughput M-chip processor, or an embedded processor.

[0080] Static random access memory (SRAM) unit 530 may include one or more tangible, non-transitory computer-readable media for storing data and / or instructions. The computer-readable storage medium stores instructions, and more specifically, stores temporary and permanent copies of the instructions. The instructions may include: when executed by at least one of the processors, causing the SoC to implement the following: Figure 1 or Figure 2 When the instructions are executed on a computer, the computer is caused to execute the method disclosed in the above embodiments.

[0081] In the accompanying drawings, some structural or method features may be shown in a specific arrangement and / or order. However, it should be understood that such a specific arrangement and / or order may not be required. Instead, in some embodiments, these features may be arranged in a manner and / or order different from that shown in the illustrative drawings. In addition, the inclusion of structural or method features in a particular figure does not mean that such features are required in all embodiments, and in some embodiments, these features may not be included or may be combined with other features.

[0082] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above is a further detailed description of the present invention in conjunction with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A method for detecting a loose connection of a current sensor, wherein the current sensor is connected to an electrical connection portion in the battery pack, characterized in that: The detection method comprises the following steps: Determining a preset temperature threshold, wherein the preset temperature threshold is related to a contact area between the current sensor and the electrical connection portion and can be used to characterize a connection state between the current sensor and the electrical connection portion; Obtaining an actual temperature value of the electrical connection portion; comparing the actual temperature value with the preset temperature threshold; Based on the actual temperature value being greater than the temperature threshold, a looseness warning message is issued.

2. The detection method according to claim 1, characterized in that Acquiring an actual temperature value of the electrical connection portion, comparing the actual temperature value with the preset temperature threshold, and issuing loosening warning information based on the actual temperature value being greater than the preset temperature threshold, including: Continuously acquiring actual temperature values ​​of the electrical connection portion for a set number of times, and comparing each of the acquired actual temperature values ​​with the preset temperature threshold; Based on the fact that each of the actual temperature values ​​obtained is greater than the preset temperature threshold, a looseness warning message is issued.

3. The detection method according to claim 2, characterized in that The set number of times is 3.

4. The detection method according to claim 1, characterized in that The method for determining the preset temperature threshold comprises: Determine the test subject; Under the condition that the current sensor of the test subject is normally connected to the electrical connection part, supplying current to the battery pack of the test subject; monitoring the temperature of the electrical connection portion of the test subject in real time, and switching the connection state between the current sensor of the test subject and the electrical connection portion to a test condition when the temperature of the electrical connection portion reaches a stable value; The current continues to be supplied to the battery pack of the test subject in the test condition, and the preset temperature threshold is obtained based on a temperature value corresponding to a stable temperature of the electrical connection portion under the test condition.

5. The detection method according to claim 4, characterized in that: The test conditions include a state where the current sensor is completely out of contact with the electrical connection portion, and a state where the current sensor is only partially in contact with the electrical connection portion; Switching the connection state between the current sensor of the test subject and the electrical connection part to the test condition, continuing to pass the current into the battery pack of the test subject in the test condition, and obtaining the preset temperature threshold value based on the temperature value corresponding to the temperature of the electrical connection part in the test condition being in a stable state, including: The current sensor is only partially in contact with the electrical connection part, the current is continuously supplied to the battery pack of the test subject in this state, and a first temperature of the electrical connection part of the test subject in this state is monitored in real time, a temperature value corresponding to a stable state of the first temperature is obtained as a first temperature threshold, and the connection between the current sensor and the electrical connection part is restored to a normal working condition; When the temperature of the electrical connection part is in a stable state, the current sensor is completely out of contact with the electrical connection part, and a second temperature of the electrical connection part of the test subject in this state is detected in real time, and a temperature value when the second temperature is in a stable state is obtained as a second temperature threshold; The preset temperature threshold is determined based on the first temperature threshold and the second temperature threshold.

6. The detection method according to claim 5, characterized in that Determining the preset temperature threshold based on the first temperature threshold and the second temperature threshold includes: Determine a first weight coefficient corresponding to the first temperature threshold and a second weight coefficient corresponding to the second temperature threshold; The preset temperature threshold is determined based on a product of the first temperature threshold and the first weight coefficient and a product of the second temperature threshold and the second weight coefficient.

7. The detection method as described in claim 6, wherein the first weight coefficient and the second weight coefficient are respectively determined based on the probability of occurrence of the corresponding test conditions and the contact area between the current sensor and the electrical connection part under the test conditions.

8. The detection method according to claim 4, characterized in that: The current sensor and the electrical connection part are connected by bolt connection; the test condition includes that part or all of the current between the current sensor and the electrical connection part flows through the bolt.

9. A device for detecting a loose connection of a current sensor, characterized in that: include: A temperature acquisition module, used to acquire the actual temperature value of the electrical connection part; The processing module is used to obtain a preset temperature threshold and the actual temperature value output by the temperature acquisition module, compare the actual temperature value with the preset temperature threshold, and issue a loosening warning message based on the actual temperature value being greater than the preset temperature threshold.

10. A readable storage medium, characterized in that: The readable storage medium stores instructions, and when the instructions are executed on the electronic device, the electronic device executes the detection method according to any one of claims 1 to 8.

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