Connector interlocking diagnosis circuit, connector and battery management system

Abstract

The utility model relates to a connector interlocking diagnosis circuit, a connector and a battery management system, and belongs to the technical field of power battery electric connection and safety protection. According to the utility model, at least two parallel detection fractures are arranged in the interlocking terminals used for diagnosing whether the corresponding connectors are reliably plugged in the low-voltage loops for monitoring the interlocking state of the connectors, when the connectors are plugged, the detection fractures are conducted, so that a plurality of low-voltage loops are formed, and a false alarm can be triggered only when the plurality of low-voltage loops are simultaneously disconnected, so that the interlocking state of the connectors is monitored. And the probability of false alarm of the diagnosis loop is effectively reduced.

Description

Technical Field

[0001] The utility model relates to a connector interlocking diagnostic circuit, a connector and a battery management system, and belongs to the field of power battery electrical connection technology and safety protection technology. Background Art

[0002] Given the booming new energy market, the safety and reliability requirements for new energy vehicles are becoming increasingly stringent. Electrical safety monitoring for new energy vehicles primarily involves high-voltage components within the vehicle, including the power battery, electronic control unit, and high-voltage power distribution system. High-voltage signals are transmitted between different high-voltage units via high-voltage connectors, which include heating connectors, high-voltage discharge connectors, fast-charging connectors, and slow-charging connectors. All high-voltage connectors generally consist of plugs and receptacles, with male and female terminals, enabling electrical signal transmission. If contact between terminals suddenly becomes disrupted during electrical signal transmission, arcing can occur, accompanied by a significant release of energy, and in severe cases, short circuits and fires can occur. Because the electrical connection reliability of high-voltage connectors is crucial to overall vehicle safety, both the design of the high-voltage connectors prioritizes electrical connection reliability and indirect diagnostics are used to promptly interrupt charging and discharging if any anomalies are detected.

[0003] The industry primarily uses two methods to diagnose electrical connection reliability. One is to place temperature sensors on the high-voltage connector terminals, leveraging the fact that abnormal electrical connections generate heat and cause temperature rises for fault diagnosis. However, this approach has the following drawbacks: 1. The temperature sensor needs to be connected to the low-voltage circuit of the battery management system. Placing the temperature sensor on the high-voltage connector is equivalent to isolating the high and low voltages only through the temperature sensor package, which can easily cause insulation failure. 2. This diagnostic approach cannot effectively warn and detect verification incidents such as short circuits and arcing between the high-voltage terminals. 3. Using temperature changes to diagnose electrical connection status lacks timeliness and often fails to effectively warn and detect scenarios where the temperature rises slowly. 4. Setting the temperature alarm threshold is complex. Setting it too low can easily cause false triggers, while setting it too high can easily cause missed alarms.

[0004] Another solution is to incorporate a high-voltage interlock function into the high-voltage connector during actual production. This allows the low-voltage side to indicate the high-voltage side connection status, enabling fault diagnosis in conjunction with the battery management system. This fault diagnosis approach, which uses the low-voltage side to indicate the high-voltage side connection status, relatively eliminates the possibility of high- and low-voltage insulation failure, providing timely warnings before a circuit ruptures. Furthermore, the high-voltage circuit's continuity can be monitored and warned in real time, eliminating the need for complex response strategies.

[0005] For example, the Chinese patent authorization announcement document with announcement number CN221261051U. However, this diagnostic circuit needs to be composed of high-voltage interlocking male and female terminals, plug housing, base housing, low-voltage wire and punching points. Any problem in any of these parts will cause the system to falsely report a fault. For example, the high-voltage interlocking male and female terminals are not fixed properly, resulting in poor crimping. Another practice in the industry is to fix the interlocking terminals with glue after inserting them into the high-voltage connector, but this solution cannot effectively solve the problem of false interlocking signal alarms. In addition, it is easy to apply glue to the conductive parts of the terminals, affecting the electrical connection effect of the interlocking signal and exacerbating the probability of false interlocking signal alarms. Utility Model Content

[0006] The purpose of the utility model is to provide a connector interlock diagnostic circuit, a connector and a battery management system, so as to solve the problem that the existing high-voltage diagnostic circuit is prone to false alarms.

[0007] To achieve the above objectives, the solution of the utility model includes:

[0008] The utility model provides a connector interlock diagnostic circuit, comprising a low-voltage circuit for monitoring the interlock status of the connectors, wherein the low-voltage circuit is connected in series with a plurality of interlock terminals corresponding one-to-one to different connectors for diagnosing whether the corresponding connectors are reliably plugged in. The utility model is characterized in that the interlock terminals include at least two parallel detection breaks, which are used to conduct when the corresponding connectors are plugged in.

[0009] Furthermore, the interlock terminal includes two detection breaks.

[0010] Furthermore, the two detection breaks are spaced apart in a direction perpendicular to a midpoint of a line connecting the two connection terminals of the connector.

[0011] Furthermore, the detection break is located in one plug-in end of the corresponding connector. When the connector is plugged in, two contacts of the detection break are in conductive contact with the conductor in the other plug-in end at the same time, thereby making the detection break conductive.

[0012] The utility model provides a connector, comprising a first plug-in end and a second plug-in end which are plugged into each other to make the connection terminals conductive, and an interlocking terminal for diagnosing whether the first plug-in end and the second plug-in end are reliably plugged into each other. The first plug-in end is provided with at least two parallel detection breaks of the interlocking terminal. When the first plug-in end and the second plug-in end are plugged into each other, the detection breaks are conductive.

[0013] Furthermore, the interlock terminal includes two detection breaks.

[0014] Furthermore, the two detection breaks are spaced apart in a direction perpendicular to a midpoint of a line connecting the two connection terminals of the connector.

[0015] A battery management system of the present invention includes a battery management system and a connector for the battery management system to detect the connection of each battery pack, and also includes a low-voltage circuit for monitoring the interlocking status of the connector. The low-voltage circuit is connected in series with a plurality of interlocking terminals corresponding to different connectors one by one and used to diagnose whether the corresponding connector is reliably plugged in. It is characterized in that the interlocking terminal includes at least two parallel detection breaks, which are used to conduct when the corresponding connector is plugged in.

[0016] Furthermore, the interlock terminal includes two detection breaks.

[0017] Furthermore, the two detection breaks are spaced apart in a direction perpendicular to a midpoint of a line connecting the two connection terminals of the connector.

[0018] The beneficial effects of the present utility model are as follows: the present utility model is an improved invention, and the present utility model is provided with at least two parallel detection breaks in the interlocking terminal for diagnosing whether the corresponding connector is reliably plugged in in the low-voltage circuit for monitoring the interlocking status of the connector. When the connector is plugged in, the detection break is connected, thereby forming multiple low-voltage circuits. Only when multiple low-voltage circuits are disconnected at the same time will a false alarm be triggered, which effectively reduces the probability of false alarm of the diagnostic circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the interlocking state judgment principle of the prior art;

[0020] Figure 2 This is a schematic diagram of a high-voltage connector of the utility model;

[0021] Figure 3 This is a top view of the high-voltage connector socket of the utility model;

[0022] Figure 4 This is a schematic diagram of the interlocking state judgment principle of the utility model.

[0023] In the figure: 11, interlocking terminal; 12, interlocking female terminal; 21, interlocking male terminal; 22, interlocking female terminal; 23, high-voltage terminal; 24, locking buckle; 25, buckle surface; 211, plug; 222, socket. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of this application more clear, this application is further described in detail below with reference to the accompanying drawings and embodiments.

[0025] The concept of the utility model is to provide a plurality of interlocking terminals on a high-voltage connector in a low-voltage circuit for monitoring the interlocking state of the connector, and each interlocking terminal is connected in parallel to the circuit.

[0026] System Example:

[0027] This embodiment provides a battery management system. The principle of the high-voltage connector interlocking state judgment system in the prior art is as follows: Figure 1 As shown in the figure, based on the performance of faulty vehicles on the market, the majority of interlock diagnostic false alarms are caused by poor insertion or crimping of interlock terminal 11. This is primarily due to the large number of high-voltage connectors in the vehicle, each of which has an interlock terminal. All of the interlock terminals on these high-voltage connectors are connected in series via a low-voltage circuit. Consequently, there are too many electrical connection nodes, making it easy for a poor crimping of one wiring harness or improper insertion of a connector to cause a short circuit in the entire high-voltage interlock circuit, leading to a serious interlock signal false alarm after the vehicle has been in operation for a period of time.

[0028] Therefore, the present invention provides at least two interlock terminals on the high-voltage connector, each interconnected in parallel to form multiple high-voltage interlock circuits. Even if the interlock terminals are not properly inserted or the wiring harness is poorly crimped, as long as one of the multiple high-voltage interlock circuits is connected, a false alarm will not be triggered. Even if the high-voltage connector plug and socket are not properly installed, multiple high-voltage interlock circuits will be disconnected simultaneously, without missing the interlock signal diagnosis.

[0029] The composition of high voltage connector is as follows Figure 2 As shown, it primarily consists of a plug 211, a socket 222, a high-voltage terminal 23, a locking catch 24, a buckle surface 25, an interlocking male terminal 21, and an interlocking female terminal 22. The interlocking female terminal 22 serves as a detection break. When the plug and socket are plugged in, the two contacts of the detection break make conductive contact with the conductor of the interlocking male terminal 21 in the plug, thereby causing the detection break to conduct. By designing the interlocking and high-voltage terminals to engage, the interlocking terminal connection status indicates the high-voltage terminal connection status. Specifically, when the high-voltage connector plug and socket are plugged in, the high-voltage terminals (connection terminals) make contact first, followed by the interlocking terminals. When the high-voltage connector plug and socket are unplugged, the interlocking terminals disconnect first, followed by the high-voltage terminals, to ensure that the interlocking terminal connection status accurately reflects the high-voltage terminal connection status. When the high-voltage connector plug and socket are plugged in, the locking catch 24 compresses the buckle surface 25 to achieve a locking effect.

[0030] For cost considerations, as a preferred embodiment, Figure 3As shown, the utility model sets two relatively independent interlocking female terminals on the upper and lower sides of the high-voltage connector, that is, two interlocking female terminals with a certain distance between them are set on the vertical line of the midpoint of the horizontal connection line of the two high-voltage terminals, wherein any one of the interlocking female terminals can independently realize the function of feedback of the high-voltage signal connection status after being connected. And it can be achieved that when the high-voltage plug and the socket are plugged in, the high-voltage terminal is connected before the interlocking terminal to ensure that the interlocking signal does not falsely report an interlocking fault; when the high-voltage plug and the socket are separated, the interlocking terminal is disconnected before the high-voltage terminal to ensure that early warning feedback can be made for the disconnection of the high-voltage signal in time. When there are more than two interlocking female terminals, it is sufficient to ensure that each interlocking female terminal is separated by a certain distance. Among them, the certain distance is to ensure that when a certain interlocking terminal is not properly plugged in, it will not affect other interlocking terminals.

[0031] The present invention takes the example of two interlocking terminals provided on each high voltage connector, each interlocking terminal including two detection ports. Figure 4 As shown, the system includes a BMS (Battery Management System) and multiple high-voltage connectors that connect multiple battery packs to the BMS. When each high-voltage connector is connected in series to the BMS to form a low-voltage circuit for monitoring the interlocking status of the high-voltage connectors, the two detection terminals of the interlocking female terminal 22 of each high-voltage connector are connected in parallel to the low-voltage circuit, thereby forming two high-voltage interlocking circuits. The high-voltage interlocking circuit disconnect alarm is triggered only when all contacts of all detection terminals are simultaneously de-energized, thereby simultaneously disconnecting the two interlocking terminals on each high-voltage connector. A single high-voltage interlocking circuit interruption due to poor crimping of the wiring harness terminals or improper insertion of the interlocking terminals does not trigger a false alarm. However, when the high-voltage connector plug is not fully engaged with the base, both high-voltage interlocking circuits are disconnected simultaneously, resulting in a high-voltage interlocking circuit disconnect alarm. Therefore, the present invention connects the interlocking terminals on the connector in parallel to the low-voltage circuit, which does not cause the system to miss an alarm.

[0032] Circuit Example:

[0033] This embodiment provides a connector interlock diagnostic circuit, which includes a high-voltage connector with multiple interlock terminals and a low-voltage circuit for monitoring the interlock status of the connector. The manner in which each interlock terminal of each high-voltage connector is connected to the connector interlock diagnostic circuit has been introduced clearly enough in the system embodiment, so it will not be repeated here.

[0034] Connector Example:

[0035] This embodiment provides a connector having a plurality of interlocking terminals. The manner in which each interlocking terminal of each connector is connected to the connector interlocking diagnostic circuit has been clearly described in the system embodiment and will not be repeated here.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A connector interlock diagnostic circuit, comprising a low-voltage circuit for monitoring the interlock status of connectors, wherein the low-voltage circuit is connected in series with a plurality of interlock terminals corresponding to different connectors for diagnosing whether the corresponding connectors are reliably plugged in, characterized in that: The interlock terminal includes at least two parallel detection breaks, and the detection breaks are used to be conductive when the corresponding connectors are plugged in.

2. The connector interlock diagnostic circuit according to claim 1, wherein: The interlock terminal includes two detection breaks.

3. The connector interlock diagnostic circuit according to claim 2, wherein: The two detection breaks are spaced apart in a direction perpendicular to the midpoint of a line connecting the two connection terminals of the connector.

4. The connector interlock diagnostic circuit according to claim 1, wherein: The detection break is located in one plug-in end of the corresponding connector. When the connector is plugged in, the two contacts of the detection break are in conductive contact with the conductor in the other plug-in end at the same time, thereby making the detection break conductive.

5. A connector comprising a first plug-in end and a second plug-in end that are plugged into each other to make the connection terminals conductive, and an interlocking terminal for diagnosing whether the first plug-in end and the second plug-in end are reliably plugged in, characterized in that: At least two parallel detection breaks of interlocking terminals are provided in the first plug-in end, and the detection breaks are conductive when the first plug-in end and the second plug-in end are plugged in.

6. The connector according to claim 5, wherein: The interlock terminal includes two detection breaks.

7. The connector according to claim 6, wherein: The two detection breaks are spaced apart in a direction perpendicular to the midpoint of a line connecting the two connection terminals of the connector.

8. A battery management system, comprising a battery management system and a connector for the battery management system to detect the connection of each battery pack, and also comprising a low-voltage circuit for monitoring the interlocking status of the connector, characterized in that: The low-voltage circuit is connected in series with several interlocking terminals corresponding one-to-one to different connectors for diagnosing whether the corresponding connector is reliably plugged in. It is characterized in that the interlocking terminal includes at least two parallel detection breaks, which are used to conduct when the corresponding connector is plugged in.

9. The battery management system according to claim 8, characterized in that: The interlock terminal includes two detection breaks.

10. The battery management system according to claim 9, characterized in that: The two detection breaks are spaced apart in a direction perpendicular to the midpoint of a line connecting the two connection terminals of the connector.

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