Connectors, battery management systems and methods for detecting connector loosening

Abstract

This application discloses a connector, a battery management system, and a method for detecting connector loosening, relating to the field of power battery technology. In the connector, a first connector includes a first connector body, a first sampling harness, and a first terminal. The first sampling harness is connected to the first connector body, and the first terminal is connected to the end of the first connector body away from the first sampling harness. A second connector includes a second connector body, a second sampling harness, and a second terminal. The second sampling harness is connected to the second connector body, and the second terminal is connected to the end of the second connector body away from the second sampling harness. The second terminal is inserted into and electrically connected to the first terminal, and a weak area is provided on the second terminal. A temperature-sensing sampling harness passes through the second sampling harness, and a temperature acquisition unit located inside the second terminal is provided at one end of the temperature-sensing sampling harness. The connector indirectly assesses its mechanical properties through thermal performance, thereby achieving early screening and failure prevention of connector terminal loosening.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and in particular to a connector, a battery management system, and a method for detecting connector loosening. Background Technology

[0002] Power batteries are the power source that powers new energy vehicles. As a new energy product with increasingly widespread applications, power batteries require automotive connectors to meet the requirements of USCAR-2 (Performance Specifications for Automotive Electrical Connector Systems) regarding vibration resistance, shock resistance, mechanical properties, and environmental adaptability.

[0003] In related technologies, compliance with USCAR-2 standards is determined by checking whether the pull-out force of connector samples is acceptable or whether there are any loose connections at the solder joints. However, when connectors are shipped in large quantities, firstly, testing the pull-out force of each connector terminal is time-consuming and labor-intensive; secondly, even if pull-out force testing has been performed on each terminal, the terminal may still be damaged during the test, easily leading to additional terminal misalignment and loosening. Therefore, providing a connector that can guarantee the quality of pull-out force testing is a problem that urgently needs to be solved. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a connector that solves the technical problem that the quality of connector pull-out force testing cannot be guaranteed in the prior art.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] In a first aspect, embodiments of this application provide a connector, including:

[0007] The first connector includes a first connector body, a first sampling harness, and a first terminal. The first sampling harness is connected to the first connector body, and the first terminal is connected to the end of the first connector body away from the first sampling harness.

[0008] The second connector includes a second connector body, a second sampling harness, and a second terminal. The second sampling harness is connected to the second connector body, and the second terminal is connected to the end of the second connector body away from the second sampling harness. The second terminal is inserted into and electrically connected to the first terminal. A weak area is provided on the second terminal to reduce the overcurrent area of ​​the second terminal so as to increase the resistance of the second terminal.

[0009] A temperature-sensing sampling harness is provided, which is inserted into the second sampling harness, and a temperature acquisition unit is provided at one end of the temperature-sensing sampling harness. The temperature acquisition unit is located in the second terminal and is used to acquire the temperature of the second terminal.

[0010] In one embodiment of the first aspect, at least one through hole is provided along the circumference of the second terminal, and the region where the at least one through hole is provided forms the weak area.

[0011] In one embodiment of the first aspect, the through holes are provided in a plurality of form, and the plurality of through holes are distributed in a matrix along the circumference of the second terminal.

[0012] In one embodiment of the first aspect, the first sampling harness is provided with a crimping area, and the first connector is further provided with a crimping terminal, the crimping terminal being located between the crimping area and the first terminal.

[0013] In one embodiment of the first aspect, in the first direction, the cross-sectional area of ​​the crimping region is greater than the cross-sectional area of ​​the crimping terminal.

[0014] In one embodiment of the first aspect, both the first terminal and the second terminal are cylindrical in shape.

[0015] In one embodiment of the first aspect, the temperature acquisition unit is a temperature sensing element disposed at the end of the temperature sensing sampling harness; or the acquisition unit is a temperature acquisition structure integrally formed with the temperature sensing sampling harness.

[0016] Secondly, embodiments of this application also provide a connector loosening detection method, which performs loosening detection on the connector described in any of the above embodiments, the loosening detection method comprising:

[0017] The connector with the first and second terminals not loose was obtained;

[0018] A preset current value is applied to the connector where the first and second terminals are not loose. When the first and second terminals reach the preset temperature value, the required time value T0 is recorded.

[0019] Obtain the connector to be tested;

[0020] A preset current value is applied to the connector under test. When the first and second terminals of the connector under test reach the preset temperature value, the required time value T1 is recorded.

[0021] The time value T1 is compared with the time value T0. When T1 is less than T0, it is determined that the first terminal and the second terminal of the connector under test are loose.

[0022] When T1 is greater than or equal to T0, it is determined that the first and second terminals of the connector under test are not loose.

[0023] In one embodiment of the second aspect, when a preset current value is applied to the connector where the first and second terminals are not loose and the preset current value is applied to the connector to be tested, the current ambient temperature is set to an initial temperature value, which is less than the preset temperature value.

[0024] Thirdly, embodiments of this application also provide a battery management system, including the connector described in any of the above embodiments.

[0025] The beneficial effects of this application are as follows: The connector includes a first connector, a second connector, and a temperature-sensing sampling harness. The first connector includes a first connector body, a first sampling harness, and a first terminal. The first sampling harness is connected to the first connector body, and the first terminal is connected to the end of the first connector body away from the first sampling harness. The second connector includes a second connector body, a second sampling harness, and a second terminal. The second sampling harness is connected to the second connector body, and the second terminal is connected to the end of the second connector body away from the second sampling harness. The second terminal is inserted into and electrically connected to the first terminal. Weak areas are provided on the second terminal to reduce the current-carrying area of ​​the second terminal and increase its internal resistance. The temperature-sensing sampling harness passes through the second sampling harness, and a temperature acquisition unit is provided at one end of the temperature-sensing sampling harness. The temperature acquisition unit is located inside the second terminal and is used to acquire the temperature of the second terminal. When the first terminal and the second terminal... When the connector connection is loose, the contact resistance between the first and second terminals is high, and the temperature will rise after power is applied. Simultaneously, the weak point design reduces the current-carrying area of ​​the second terminal, increasing its resistance. Thus, with a constant current in the series circuit, the temperature of the second terminal will continue to rise. By inserting a temperature-sensing sampling harness within the second sampling harness and placing its temperature acquisition unit inside the second terminal, the temperature of the second terminal is collected. The time it takes for the second terminal to reach a preset temperature is compared with the standard value for a properly connected connector terminal. If the time exceeds the standard value, it indicates that the connector terminal is loose. This indirectly assesses the mechanical properties through thermal performance, achieving early screening and failure prevention of connector terminal loosening without damaging the terminals. This solves the problem of unreliable pull-out force testing in existing technologies and improves product reliability. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A schematic diagram of the connector from one perspective is shown in some embodiments of this application;

[0028] Figure 2 It shows Figure 1 Schematic diagram of the cross-sectional structure along the AA direction;

[0029] Figure 3 An exploded view of the connector in some embodiments of this application is shown;

[0030] Figure 4 This paper shows a schematic diagram of the second connector from one perspective in some embodiments of this application;

[0031] Figure 5 It shows Figure 4 Schematic diagram of the cross-sectional structure along the BB direction;

[0032] Figure 6 A three-dimensional structural schematic diagram of the second connector in some embodiments of this application is shown;

[0033] Figure 7 A flowchart illustrating a connector loosening detection method in some embodiments of this application is shown.

[0034] Explanation of key component symbols:

[0035] 100-Connector; 110-First connector; 111-First sampling harness; 1111-Crimping area; 112-First terminal; 113-Crimping terminal; 120-Second connector; 121-Second sampling harness; 122-Second terminal; 123-Weak area; 1231-Through hole; 124-Temperature sensing sampling harness; 125-Temperature acquisition unit. Detailed Implementation

[0036] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote 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 this application, and should not be construed as limiting this application.

[0037] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0039] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0040] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0041] Currently, in related technologies, to test whether automotive connectors meet the USCAR-2 (Performance Specification for Automotive Electrical Connector Systems) requirements regarding vibration resistance, shock resistance, mechanical properties, and environmental adaptability, compliance is determined by checking the pull-out force of connector samples or the presence of loose connections at solder joints. However, in mass production, it is impractical to test the pull-out force of every single terminal. Firstly, electric vehicles use numerous low-voltage connectors, each containing 20-30 pins, making testing the pull-out force of each terminal time-consuming and labor-intensive. Secondly, even if pull-out force testing is performed on each terminal, it can cause damage during the testing process, leading to terminal misalignment and loosening, thus compromising quality.

[0042] like Figure 1 and Figure 2 As shown, to address the aforementioned issues, embodiments of this application provide a connector 100 for facilitating the detection of loose terminals, primarily used in battery management systems. The connector 100 includes a first connector 110, a second connector 120, and a temperature-sensing sampling harness 124.

[0043] The first connector 110 includes a first body, a first sampling harness 111, and a first terminal 112. The first sampling harness is connected to the first connector body, and the first terminal is connected to the end of the first connector body away from the first sampling harness 111. The second connector 120 includes a second connector body, a second sampling harness 121, and a second terminal 122. The second sampling harness 121 is connected to the second connector body, and the second terminal 122 is connected to the end of the second connector body away from the second sampling harness 121. The second terminal 122 is inserted into and electrically connected to the first terminal 112. A weak area 123 is provided on the second terminal 122 to reduce the current-carrying area of ​​the second terminal 122 and increase the resistance of the second terminal 122. In this way, when energized, the temperature of the second terminal 122 is higher, which amplifies manufacturing defects during detection, thereby facilitating the differentiation of anomalies by comparing data results.

[0044] It should be mentioned that the first sampling harness 111 and the second sampling harness 121 are electrically connected to the component to be sampled, and the other is electrically connected to other test components. The information of the component to be sampled is transmitted to the other test components for detection through current. The other test components compare and analyze the detection information and then feed it back to the control platform to issue corresponding instructions.

[0045] Furthermore, the second terminal can be made of a positive temperature coefficient thermistor. The characteristic of a positive temperature coefficient thermistor is that the higher the temperature, the greater the resistance. The positive temperature coefficient thermistor can be nickel, copper, or a composite oxide of a semiconducting metal oxide and a transition metal, etc.

[0046] Furthermore, the first terminal 112 can be a male terminal, and the second terminal 122 can be selected as a female terminal, so that the second terminal 122 can be conveniently tested externally during mating.

[0047] Combination Figure 5 As shown, the temperature sensing sampling harness 124 is inserted into the second sampling harness 121, and a temperature acquisition unit 125 is provided at one end of the temperature sensing sampling harness 124. The temperature acquisition unit 125 is located in the second terminal 122 and is used to acquire the temperature at the connection position of the second terminal 122.

[0048] The connector 100 provided in the embodiments of this application reduces the overcurrent area of ​​the second terminal 122 by providing a weak area 123 on the second terminal 122, thereby increasing the internal resistance of the second terminal 122. In this way, when detecting the looseness of the terminals of connector 100, assuming that the first terminal 112 and the second terminal 122 of connector 100 are not firmly crimped, the contact internal resistance of the first terminal 112 and the second terminal 122 is relatively large. As a result, the temperature of the first terminal 112 and the second terminal 122 will rise when power is applied. Since the second terminal has a weak area 123, the setting of the weak area 123 reduces the current-carrying area of ​​the second terminal 122, and the internal resistance of the second terminal 122 will be significantly increased compared with the case where the weak area 123 is not set. Thus, with the current remaining constant in the series circuit, the temperature of the second terminal 122 will increase. By passing the temperature sensing sampling harness 124 through the second sampling harness 121 and placing its temperature acquisition unit 125 inside the second terminal 122, the temperature of the second terminal 122 is collected. The time it takes for the second terminal to reach the preset temperature is compared with the standard value when the connector terminals are normally connected. If it exceeds the range of the standard value, it indicates that the connector terminals are loose. In this embodiment, the mechanical properties are indirectly assessed through thermal performance, so as to achieve the effect of early screening and failure prevention of connector 100 terminal loosening. This does not damage the terminals, avoids the problem of unreliable pull-out force test quality of connector 100 in the prior art, and improves the reliability of the product.

[0049] It should be noted that, according to the formula internal resistance R=ρ*L / S, it can be seen that the internal resistance of the second terminal 122 will increase after a weak area 123 is set on it, compared to the second terminal 122 without a weak area 123. Here, R is the internal resistance of the second terminal 122, L is the length of the second terminal 122, and S is the current-carrying area.

[0050] like Figures 3 to 5 As shown, in one embodiment, optionally, at least one through hole 1231 is formed along the circumference of the second terminal 122, and the area where the at least one through hole 1231 is formed forms the weak area 123. By forming the weak area 123 through the circumferential opening of the second terminal 122, manufacturing defects in the area to be inspected (the loosening detection point of the first terminal 112 and the second terminal 122) are magnified, making them easier to observe. At the same time, the opening facilitates the manufacturing of the weak area 123 without the need for additional structures, thus reducing product manufacturing costs.

[0051] Furthermore, multiple through holes 1231 are provided, and the multiple through holes 1231 are distributed in a matrix along the circumference of the second terminal 122. In this way, by arranging multiple through holes 1231 at equal intervals along the circumference of the second terminal 122, a weak area 123 is formed, thereby reducing the flow area of ​​the second terminal 122.

[0052] It should be noted that in other embodiments, multiple blind holes may be formed in the circumferential direction of the second terminal 122 to form a weak area 123.

[0053] It is understood that the shape of the through hole 1231 or blind hole in the above embodiments can be at least one of the following: circle, square, triangle, polygon, ellipse or irregular shape. In this embodiment, the through hole 1231 is a circular hole.

[0054] like Figure 1 and Figure 2 As shown, in any of the above embodiments, optionally, the first sampling harness 111 is provided with a crimping area 1111, and the first connector 110 is also provided with a crimping terminal 113, wherein the crimping terminal 113 is located between the crimping area 1111 and the first terminal 112.

[0055] In this embodiment, a crimping area 1111 is provided on the first sampling wire harness 111, and a crimping terminal 113 is provided on the first connector 110. Thus, in the operation of the connector 100, the first sampling wire harness 111 can be fixed in the crimping area 1111 using a hoop, then the conductor portion (such as a copper or aluminum core) of the first sampling wire harness 111 can be stripped, and the conductor portion of the first sampling wire harness 111 can be inserted into the crimping terminal 113. The crimping terminal 113 can then be crimped using a crimping device such as a pressure clamp, ensuring a reliable connection between the first sampling wire harness 111 and the crimping terminal 113, thereby improving the reliability of the connection.

[0056] like Figure 2As shown, in the embodiment of the crimping area 1111 and crimping terminal 113 described above, further, in the first direction, the cross-sectional area of ​​the crimping area 1111 is larger than the cross-sectional area of ​​the crimping terminal 113. This facilitates inserting the conductor portion of the first sampling wire harness 111 stripped from the crimping area 1111 into the crimping terminal 113.

[0057] It should be noted that the first direction is the direction perpendicular to the axis of the first sampling bundle 111.

[0058] like Figure 3 As shown, in any of the above embodiments, optionally, both the first terminal 112 and the second terminal 122 are cylindrical structures.

[0059] In this embodiment, by designing both the first terminal 112 and the second terminal 122 as cylindrical structures, it is convenient to insert the first terminal 112 and the second terminal 122. Specifically, the second terminal 122 is provided with a mounting groove for inserting with the first terminal 112. A part of the first terminal 112 is inserted into the mounting groove and is interference-fitted with the groove wall, thereby increasing the reliability of the connection between the first terminal 112 and the second terminal 122.

[0060] It is understood that in other embodiments, the first terminal 112 and the second terminal 122 can also be designed as a square structure, a triangular structure, a pentagonal structure, or a hexagonal structure, as long as a weak area 123 is provided on the second terminal 122. There are no specific restrictions on the shape of the first terminal 112 and the second terminal 122, and they will not be listed here.

[0061] like Figure 6 As shown, in any of the above embodiments, optionally, the temperature acquisition unit 125 is a temperature sensing element disposed at the end of the temperature sensing sampling harness 124. In this embodiment, the temperature sensing element can be a temperature sensor, thereby detecting the temperature at the connection position between the second terminal 122 and the first terminal 112.

[0062] Of course, in other embodiments, the acquisition unit may also be a temperature acquisition structure integrally formed with the temperature sensing sampling harness 124. For example, a thermistor or a metal strip sensor integrated at the end of the temperature sensing sampling harness 124.

[0063] like Figure 7 As shown, embodiments of this application also provide a method for detecting looseness in a connector 100, which performs looseness detection on the connector 100 described in any of the above embodiments. The looseness detection method includes:

[0064] Step S100: Obtain a connector 100 with no loosening of the first terminal 112 and the second terminal 122, and use this connector 100 as a reference.

[0065] Step S110: A preset current value is applied to the connector 100, where the first terminal 112 and the second terminal 122 are not loose. When the first terminal 112 and the second terminal 122 reach the preset temperature value, the required time value T0 is recorded. The required time value T0 when the connector 100 is heated to the preset temperature value is used as a reference standard.

[0066] Step S120: Obtain the connector 100 to be tested.

[0067] Step S130: Apply the preset current value to the connector 100 to be tested. When the second terminal 122 of the connector 100 to be tested reaches the preset temperature value, record the required time value T1.

[0068] Step S140: Compare the time value T1 with the time value T0. When T1 is less than T0, it is determined that the first terminal 112 and the second terminal 122 of the connector 100 under test are loose. When T1 is greater than or equal to T0, it is determined that the first terminal and the second terminal of the connector under test are not loose.

[0069] For example, if the time value T0 is within 10±2 minutes, and the time value T1 for the connector 100 to be tested to heat up to the preset temperature is 7 minutes, which is less than the minimum value of T0 (8 minutes), then it is determined that the upper limit of the specification that the first terminal 112 and the second terminal 122 are not loose is exceeded, that is, it is determined that the first terminal 112 and the second terminal 122 are loose, and the terminals of the connector 100 to be tested are deemed defective. If the time value T1 for the connector 100 to be tested to heat up to the preset temperature is 9 minutes or 13 minutes, where 9 minutes is within the range of 8 minutes to 10 minutes, and 13 minutes is greater than the maximum value of T0 (12 minutes), then it can be determined that the upper limit of the specification that the first terminal 112 and the second terminal 122 are not loose is not exceeded, that is, it is determined that the first terminal 112 and the second terminal 122 are not loose. It is understandable that the heat generated at the loosened position of the first terminal 112 and the second terminal 122 will be more severe than when they are not loose. Under the same circumstances, the time taken for the loosened position to reach the preset temperature is less than the time taken for the non-loose position to reach the preset temperature. That is, the loosening of the two is determined by comparing the time value when the temperature rises to the preset temperature.

[0070] The connector 100 loosening detection method provided in this embodiment transforms the mechanical phenomenon of loosening into a temperature test, causing no damage to the terminals and ensuring the quality requirements of the connector 100. Simultaneously, the tooling can be reused, reducing testing costs. Related technologies require high precision through mechanical testing, which may be difficult to identify terminals with mild loosening. However, this embodiment amplifies the observed signal by setting a weak area 123, thus amplifying the fault phenomenon and preventing faulty components from being detected, thereby improving testing quality.

[0071] In one embodiment, optionally, when a preset current value is applied to the connector 100 where the first terminal 112 and the second terminal 122 are not loose, and the preset current value is applied to the connector 100 to be tested, the current ambient temperature is set to an initial temperature value, which is less than the preset temperature value.

[0072] For example, under room temperature conditions, a preset current value is applied to the connector 100 whose first terminal 112 and second terminal 122 are not loose, so that its temperature reaches the preset temperature value. At this time, the required time value T0 is recorded. Similarly, under room temperature conditions, the preset current value is applied to the connector 100 to be tested, so that its temperature reaches the preset temperature value. At this time, the required time value T1 is recorded, so as to achieve temperature consistency between the previous and subsequent tests and improve the accuracy of the test.

[0073] Understandably, the initial temperature can also be measured in a constant-temperature testing chamber to ensure the consistency of the error as the connector 100 rises from the initial temperature to the preset temperature value, thereby improving the testing accuracy and quality.

[0074] Embodiments of this application also provide a battery management system, including the connector 100 described in any of the above embodiments.

[0075] The battery management system provided in this embodiment includes the connector 100 in any of the above embodiments, and therefore has all the beneficial effects of the connector 100, which will not be described in detail here.

[0076] In summary, this application proposes a connector 100, a battery management system, and a method for detecting looseness of the connector 100. A weak area 123 is provided on the second terminal 122 of the connector 100 to reduce the current-carrying area of ​​the second terminal 122. Thus, when the connection between the first terminal 112 and the second terminal 122 becomes loose, the contact resistance between the first terminal 112 and the second terminal 122 becomes larger. As a result, the temperature at the first terminal 112 and the second terminal 122 will rise when power is applied. Since the second terminal has a weak area 123, the current-carrying area of ​​the second terminal 122 is reduced. The internal resistance of the second terminal 122 will increase significantly compared to when the weak area 123 is not set. Thus, with the current remaining constant in the series circuit, the temperature of the second terminal 122 will continue to rise. By passing the temperature sensing sampling harness 124 through the second sampling harness 121 and placing its temperature acquisition unit 125 inside the second terminal 122, the temperature of the second terminal 122 is collected. The time it takes for the second terminal to reach the preset temperature is compared with the standard value when the connector terminal is normally connected. If it exceeds the range of the standard value, it indicates that the connector terminal is loose. In this embodiment, the mechanical properties are indirectly assessed through thermal performance, so as to achieve the effect of early screening and failure prevention of connector 100 terminal loosening. This does not damage the terminals, avoids the problem of unreliable pull-out force test quality of connector 100 in the prior art, and improves the reliability of the product.

[0077] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0078] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A connector looseness detection method characterized by, The connector is subjected to looseness detection, the connector comprises a first connector, a second connector and a temperature sensing sampling wire harness, the first connector comprises a first connector body, a first sampling wire harness and a first terminal, the first sampling wire harness is connected with the first connector body, and the first terminal is connected with one end of the first connector body away from the first sampling wire harness; The second connector comprises a second connector body, a second sampling wire harness and a second terminal, the second sampling wire harness is connected with the second connector body, the second terminal is connected with one end of the second connector body away from the second sampling wire harness, the second terminal is inserted and electrically connected with the first terminal, a weak area is arranged on the second terminal, the weak area is located at the insertion position of the second terminal and the first terminal, and the weak area is used for reducing the flow area of the second terminal so that the resistance of the second terminal is increased; The temperature sensing sampling wire harness is arranged in the second sampling wire harness, and one end of the temperature sensing sampling wire harness is provided with a temperature acquisition unit, the temperature acquisition unit is located in the second terminal, and the temperature acquisition unit is used for acquiring the temperature of the second terminal; The looseness detection method comprises the following steps: A connector in which the first terminal and the second terminal are not loosened is obtained. A current with a preset current value is passed through the obtained connector in which the first terminal and the second terminal are not loosened, and when the first terminal and the second terminal reach a preset temperature value, a required time value T0 is recorded. A to-be-detected connector is obtained. The obtained to-be-detected connector is passed through the current with the preset current value, and when the first terminal and the second terminal of the to-be-detected connector reach the preset temperature value, a required time value T1 is recorded. The time value T1 is compared with the time value T0. When T1 is less than T0, it is determined that the first terminal and the second terminal of the to-be-detected connector are loosened. When T1 is greater than or equal to T0, it is determined that the first terminal and the second terminal of the to-be-detected connector are not loosened.

2. A battery management system, characterized by, The connector looseness detection method is used for performing the connector looseness detection method.

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