Wire harness sequence detection circuit and detection device

Abstract

The utility model discloses a wire harness sequence detection circuit and device. The wire harness sequence detection circuit comprises a first direction detection unit, a second direction detection unit and a reverse connection prevention unit which are arranged between a first access end and a second access end in parallel. The negative electrode of the first direction detection unit is connected to the first access end, the positive electrode of the first direction detection unit is connected to the second access end, the positive electrode of the second direction detection unit is connected to the first access end, and the negative electrode of the second direction detection unit is connected to the second access end; the reverse connection prevention unit is arranged between the first direction detection unit and the second direction detection unit, and when the first direction detection unit is switched on, the reverse connection prevention unit is switched off. According to the invention, whether the battery pack voltage acquisition wire harness sequence has a wiring error or not can be effectively screened, the detection result can be visually displayed, and the reliability is high.

Description

Technical Field

[0001] The present application belongs to the field of safety detection technology, and specifically relates to a wiring harness sequence detection circuit and a detection device. Background Art

[0002] With the continuous development of the new energy industry, the demand for energy storage batteries is also increasing. In the production of power and energy storage battery systems, it is necessary to connect the voltage acquisition harness to the battery management system to achieve battery monitoring and protection. The battery module is the basic component of the energy storage system. It consists of a battery pack, a voltage acquisition harness, a temperature acquisition harness, and a battery management system. Due to the large number of battery packs in the battery module and the complex series and parallel connections and layout, the installation of the voltage acquisition harness is also extremely complicated. Manual installation is very prone to wiring errors and loose connections. Once the voltage acquisition harness is connected to the battery management system with a disordered or loose connection, the battery management system acquisition circuit will be damaged or burned, and the monitoring and protection functions will not be realized. In serious cases, it will cause safety accidents and threaten human safety.

[0003] Currently, some common methods for checking wiring sequence accuracy include visual inspection based on drawings and measuring the voltage at each acquisition point in the wiring harness with a multimeter. These methods are inefficient, subject to operator subjective factors, and cannot guarantee test accuracy. Therefore, how to effectively screen the battery pack voltage acquisition harness for wiring errors and visually display the screening results is an urgent problem to be solved. Utility Model Content

[0004] The present application provides a wiring harness sequence detection circuit and detection device, which can effectively screen whether there are wiring errors in the battery pack voltage acquisition wiring harness sequence and intuitively display the screening results.

[0005] In order to solve the above technical problems, the present application provides a wiring harness sequence detection circuit, which includes a first direction detection unit, a second direction detection unit and an anti-reverse connection unit arranged in parallel between a first access terminal and a second access terminal;

[0006] The cathode of the first direction detection unit is connected to the first access terminal, the anode of the first direction detection unit is connected to the second access terminal, the anode of the second direction detection unit is connected to the first access terminal, and the cathode of the second direction detection unit is connected to the second access terminal;

[0007] The anti-reverse connection unit is provided between the first direction detection unit and the second direction detection unit, and is turned off when the first direction detection unit is turned on.

[0008] As a further improvement of the present application, the anti-reverse polarity unit includes a first unidirectional conductive element, a first end of the first unidirectional conductive element is connected to the negative pole of the second direction detection unit, a second end of the first unidirectional conductive element is connected to the positive pole of the first direction detection unit, and a third end of the first unidirectional conductive element is connected between the negative pole of the first direction detection unit and the positive pole of the second direction detection unit.

[0009] As a further improvement of the present application, the anti-reverse connection unit further includes a first voltage stabilizing diode, which is arranged in parallel between the second end of the first unidirectional conductive element and the third end of the first unidirectional conductive element;

[0010] The anode of the first voltage stabilizing diode is connected to the second end of the first unidirectional conductive element, and the cathode of the first voltage stabilizing diode is connected to the third end of the first unidirectional conductive element.

[0011] As a further improvement of the present application, the first direction detection unit includes a first light-emitting diode, the cathode of the first light-emitting diode is connected to the first access terminal, and the anode of the first light-emitting diode is connected to the second access terminal;

[0012] The second direction detection unit includes a second light emitting diode, wherein the anode of the second light emitting diode is connected to the first access terminal, and the cathode of the second light emitting diode is connected to the second access terminal.

[0013] As a further improvement of the present application, the second direction detection unit also includes a second voltage regulator diode connected to the second light-emitting diode, the cathode of the second voltage regulator diode is connected to the first access end, and the anode of the second voltage regulator diode is connected to the anode of the second light-emitting diode.

[0014] As a further improvement of the present application, the second direction detection unit also includes a second voltage-stabilizing diode and a first voltage-stabilizing resistor, the cathode of the second voltage-stabilizing diode is connected to the first access end, and the anode of the second voltage-stabilizing diode is connected to the second access end; the second light-emitting diode is connected to the first voltage-stabilizing resistor and is arranged in parallel at both ends of the second voltage-stabilizing diode.

[0015] As a further improvement of the present application, the wiring harness sequence detection circuit also includes an output indication unit arranged in parallel at both ends of the second direction detection unit, and the output indication unit includes a third light-emitting diode. When the voltage across the first access end and the second access end is equal to a preset voltage, the third light-emitting diode is turned on and emits light.

[0016] As a further improvement of the present application, the output indication unit further includes a second unidirectional conductive element and a third unidirectional conductive element;

[0017] The first end of the second unidirectional conductive element is connected to the third end of the third unidirectional conductive element, the third end of the second unidirectional conductive element is connected to the positive electrode of the second direction detection unit, the first end of the third unidirectional conductive element is connected to the positive electrode of the third light-emitting diode, and the cathode of the third light-emitting diode is commonly connected to the second end of the second unidirectional conductive element and the second end of the third unidirectional conductive element.

[0018] As a further improvement of the present application, the first end of the third unidirectional conductive element is connected to the first resistor and then connected to the anode of the third light-emitting diode;

[0019] The second end of the second unidirectional conductive element and the second end of the third unidirectional conductive element are connected together and then connected to a second resistor, and the other end of the second resistor is connected to the cathode of the third light emitting diode.

[0020] Based on the above-mentioned wiring harness sequence detection circuit, the present application provides a wiring harness sequence detection device, which is used for wiring sequence detection of a battery module. The battery module is provided with several battery packs. The first access end of the wiring harness sequence detection device is connected to the positive pole corresponding to the battery pack, and the second access end of the wiring harness sequence detection device is connected to the negative pole corresponding to the battery pack.

[0021] The wiring harness sequence detection circuit and detection device provided in this application have the following beneficial effects:

[0022] The wiring harness sequence detection circuit and detection device provided in the present application detect whether the battery pack between the first access terminal and the second access terminal is reversely connected through a first direction detection unit. When the first light-emitting diode is lit, it indicates that there is a negative voltage in the battery pack between the first access terminal and the second access terminal. At the same time, the anti-reverse connection unit is cut off to prevent the reverse current from damaging other components in the circuit. The wiring harness sequence detection circuit and detection device provided in the present application detect whether there is an overvoltage in the battery pack between the first access terminal and the second access terminal through a second direction detection unit. When the second light-emitting diode is lit, it indicates that there is an overvoltage between the first access terminal and the second access terminal, so that the operator can repair the wiring of the currently detected battery pack according to the lighting status of the first light-emitting diode and the second light-emitting diode. The present application can effectively screen whether there are wiring errors in the wiring sequence of the battery pack voltage acquisition wiring harness, and intuitively display the screening results. It has high reliability and effectively ensures the service life of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only part of the embodiments of the present application, rather than all the embodiments. For ordinary technicians in this field, without paying any creative work, other drawings obtained based on these drawings are all within the scope of protection of this application.

[0024] Figure 1 Schematic diagram of the structure of the wiring harness sequence detection circuit provided in the embodiment of the present application Figure 1 ;

[0025] Figure 2 Schematic diagram of the structure of the wiring harness sequence detection circuit provided in the embodiment of the present application Figure 2 ;

[0026] Figure 3 This is the first application example of the wiring harness sequence detection circuit provided in the embodiment of the present application;

[0027] Figure 4 This is the second application example of the wiring harness sequence detection circuit provided in the embodiment of the present application;

[0028] Figure 5 This is the third application example of the wiring harness sequence detection circuit provided in the embodiment of the present application;

[0029] Figure 6 This is the fourth application example of the wiring harness sequence detection circuit provided in the embodiment of the present application;

[0030] Figure 7 This is the fifth application example of the wiring harness sequence detection circuit provided in the embodiment of the present application;

[0031] Figure 8 This is the sixth application example of the wiring harness sequence detection circuit provided in the embodiment of the present application;

[0032] Figure 9 This is the seventh application example of the wiring harness sequence detection circuit provided in the embodiment of the present application;

[0033] Figure 10 This is an application example 1 of the wiring harness sequence detection device provided in the embodiment of the present application;

[0034] Figure 11 This is the second application example of the wiring harness sequence detection device provided in the embodiment of the present application;

[0035] Figure 12 This is the third application example of the wiring harness sequence detection device provided in the embodiment of the present application;

[0036] Figure 13This is the fourth application example of the wiring harness sequence detection device provided in the embodiment of the present application;

[0037] Description of reference numerals:

[0038] 1-first access terminal; 2-second access terminal; 10-first direction detection unit; 20-second direction detection unit; 30-anti-reverse connection unit; 40-output indication unit;

[0039] O3 - first unidirectional conductive element; D5 - first voltage-stabilizing diode; D4 - second voltage-stabilizing diode; R8 - first voltage-stabilizing resistor; D1 - first light-emitting diode; D2 - second light-emitting diode; D3 - third light-emitting diode; first resistor - R6; second resistor - R5. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0041] In order to make the description of the contents of this disclosure more detailed and complete, the following is an illustrative description of the implementation methods and specific examples of this application; however, this is not the only form of implementing or using the specific embodiments of this application. The implementation methods cover the features of multiple specific embodiments and the method steps and their sequence for constructing and operating these specific embodiments. However, other specific embodiments can also be used to achieve the same or equal functions and step sequences. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0042] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0043] In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" refers to two or more than two, and other quantifiers should be understood similarly. The preferred embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In addition, the embodiments of the present application and the features in the embodiments may be combined with each other unless there is a conflict.

[0044] Please refer to Figures 1-9 The present application provides a wiring harness sequence detection circuit and detection device, which can effectively screen whether there are wiring errors in the battery pack voltage acquisition wiring harness sequence and intuitively display the screening results.

[0045] Please refer to Figure 1 , which is a schematic diagram of the structure of the wiring harness sequence detection circuit provided in the embodiment of the present application Figure 1 The wiring harness sequence detection circuit includes a first direction detection unit 10, a second direction detection unit 20 and an anti-reverse connection unit 30 which are arranged in parallel between the first access terminal 1 and the second access terminal 2.

[0046] As an optional embodiment, the negative pole of the above-mentioned first direction detection unit 10 is connected to the first access terminal 1, the positive pole of the first direction detection unit 10 is connected to the second access terminal 2, the positive pole of the second direction detection unit 20 is connected to the first access terminal 1, the negative pole of the second direction detection unit 20 is connected to the second access terminal 2, and the anti-reverse polarity unit 30 is arranged between the first direction detection unit 10 and the second direction detection unit 20. When the first direction detection unit 10 is turned on, the anti-reverse polarity unit 30 is cut off.

[0047] In the embodiment of the present application, when the current direction between the first access terminal 1 and the second access terminal 2 is from the first access terminal 1 to the second access terminal 2, since the positive electrode of the second direction detection unit 20 is connected to the first access terminal 1 and the negative electrode of the second direction detection unit 20 is connected to the second access terminal 2, the second direction detection unit 20 is turned on; when the current direction between the first access terminal 1 and the second access terminal 2 is from the second access terminal 2 to the first access terminal 1, since the negative electrode of the first direction detection unit 10 is connected to the first access terminal

[0048] 1. The positive pole of the first direction detection unit 10 is connected to the second access terminal 2, so the first direction detection unit 10 will be turned on, and the reverse connection unit is arranged between the first direction detection unit 10 and the second direction detection unit 20. When the first direction detection unit 10 is turned on, the anti-reverse connection unit 30 is turned off, so that the second direction detection unit 20 and other electrical components in the wiring harness sequence detection circuit are not turned on, avoiding the safety hazards caused by reverse connection.

[0049] As an optional embodiment, the above-mentioned anti-reverse polarity unit 30 includes a first unidirectional conductive element, the first end of the first unidirectional conductive element is connected to the negative pole of the second direction detection unit 20, the second end of the first unidirectional conductive element is connected to the positive pole of the first direction detection unit 10, and the third end of the first unidirectional conductive element is connected between the negative pole of the first direction detection unit 10 and the positive pole of the second direction detection unit 20.

[0050] In the embodiment of the present application, the above-mentioned first unidirectional conductive element can be set as a transistor, or can be set as a unidirectional conductive element such as a field effect transistor. When the first unidirectional conductive element is set as a transistor, the transistor can be an NPN transistor or a PNP transistor. When the first unidirectional conductive element is set as a field effect transistor, the field effect transistor can be an enhancement type NMOS transistor, a depletion type NMOS transistor, an enhancement type PMOS transistor, or a depletion type PMOS transistor. In principle, the first unidirectional conductive element should have three ports, namely a first end, a second end, and a third end, and have a unidirectional conduction characteristic. The present application does not impose any further restrictions on the specific setting form of the first unidirectional conductive element.

[0051] For example, please refer to Figure 3 , which is an application embodiment 1 of the wiring harness sequence detection circuit provided in an embodiment of the present application, when the first unidirectional conductive element is set to an NMOS tube, it can be observed that the first end, the second end and the third end of the first unidirectional conductive element correspond to the drain, the source and the gate of the NMOS tube Q3, respectively. At this time, the drain of the NMOS tube Q3 is connected to the negative electrode of the second direction detection unit 20, the source of the NMOS tube Q3 is connected to the positive electrode of the first direction detection unit 10, and the gate of the NMOS tube Q3 is connected between the negative electrode of the first direction detection unit 10 and the positive electrode of the second direction detection unit 20.

[0052] Please refer to Figure 5, which is the third application embodiment of the wiring harness sequence detection circuit provided in the embodiment of the present application. When the first unidirectional conductive element is set to an N-type transistor Q3, it can be observed that the first end, the second end and the third end of the first unidirectional conductive element correspond to the collector, the emitter and the base of the transistor Q3 respectively. At this time, the collector of the transistor Q3 is connected to the negative electrode of the second direction detection unit 20, the emitter of the transistor Q3 is connected to the positive electrode of the first direction detection unit 10, and the base of the transistor Q3 is connected between the negative electrode of the first direction detection unit 10 and the positive electrode of the second direction detection unit 20.

[0053] In the embodiment of the present application, regardless of whether the first unidirectional conductive element is set as a transistor or a field-effect transistor, the base of the transistor or the gate of the field-effect transistor is preferably connected to the resistor R2 and then connected between the negative electrode of the first direction detection unit 10 and the positive electrode of the second direction detection unit 20 to prevent overvoltage between the first access terminal 1 and the second access terminal 2 from causing damage to the first unidirectional conductive element.

[0054] As an optional embodiment, a first voltage stabilizing diode D5 may be further provided between the second end and the third end of the first unidirectional conductive element. The first voltage stabilizing diode D5 is provided in parallel between the second end and the third end of the first unidirectional conductive element, and the positive electrode of the first voltage stabilizing diode D5 is connected to the second end of the first unidirectional conductive element, and the negative electrode of the first voltage stabilizing diode D5 is connected to the third end of the first unidirectional conductive element.

[0055] For example, please refer to Figure 5 When the first unidirectional conductive element is set as the transistor Q3, the anode of the first voltage stabilizing diode D5 is connected to the emitter of the transistor Q3, and the cathode of the first voltage stabilizing diode D5 is connected to the base of the transistor Q3. The base of the transistor Q3 can be connected to the resistor R8 and then connected to the cathode of the first voltage stabilizing diode D5.

[0056] Please refer to Figure 4 , which is the second application example of the wiring harness sequence detection circuit provided by the embodiment of the present application, when the first unidirectional conductive element is set to the NMOS tube Q3, the anode of the first voltage stabilizing diode D5 is connected to the source of the NMOS tube Q3, and the cathode of the first voltage stabilizing diode D5 is connected to the gate of the NMOS tube Q3. Since the conduction voltage drop of the first voltage stabilizing diode D5 is about 3.7V, and the NMOS tube Q3 has a parasitic diode, please refer to Figure 5 It can be seen that there is no need to connect the gate of the NMOS transistor Q3 to the resistor R7 and then to the cathode of the first voltage stabilizing diode D5.

[0057] As an optional implementation, please continue to refer to Figure 3The first direction detection unit 10 includes a first light-emitting diode D1, the cathode of the first light-emitting diode D1 is connected to the first access terminal 1, and the anode of the first light-emitting diode D1 is connected to the second access terminal 2. When the direction of the current between the first access terminal 1 and the second access terminal 2 is from the second access terminal 2 to the first access terminal 1, the first light-emitting diode D1 is turned on and emits light.

[0058] Furthermore, a resistor R1 may be connected between the cathode of the first light-emitting diode D1 and the first access terminal 1 . The above configurations are all feasible and are not further limited in this application.

[0059] As an optional embodiment, the above-mentioned second direction detection unit 20 includes a second light-emitting diode D2. It can be observed that the positive electrode of the second light-emitting diode D2 is connected to the first access terminal 1, and the negative electrode of the second light-emitting diode D2 is connected to the second access terminal 2. When the direction of the current between the first access terminal 1 and the second access terminal 2 is from the first access terminal 1 to the second access terminal 2, the second light-emitting diode D2 is turned on and emits light.

[0060] As an optional implementation, a second voltage regulator diode D4 may be provided in the second direction detection unit 20 to detect whether there is an overvoltage between the first access terminal 1 and the second access terminal 2. Figure 3 In this embodiment, the cathode of the second voltage stabilizing diode D4 is connected to the first access terminal 1, and the anode of the second voltage stabilizing diode D4 is connected to the anode of the second light emitting diode D2.

[0061] Since the conduction voltage drop of the second voltage stabilizing diode D4 is about 3.7V, when an overvoltage occurs between the first access terminal 1 and the second access terminal 2, the voltage will first pass through the second voltage stabilizing diode D4 to turn on the second voltage stabilizing diode D4, and then pass through the second light-emitting diode D2 to turn on and emit light.

[0062] Taking the preset voltage of 3.2V as an example, when the voltage between the first access terminal 1 and the second access terminal 2 is 6.4V, which is greater than the preset voltage of 3.2V, since the conduction voltage drop of the second voltage stabilizing diode D4 is approximately 3.7V, the second voltage stabilizing diode D4 and the second light-emitting diode D2 will both be turned on, causing the second light-emitting diode D2 to be turned on and emit light, thereby indicating whether there is currently an overvoltage.

[0063] Furthermore, a resistor R3 can be set between the cathode of the second voltage zener diode D4 and the first access terminal 1, or the number of the second voltage zener diodes D4 can be adjusted accordingly. In principle, the conduction voltage drop generated by the second voltage zener diode D4 and the resistor R3 is used to meet different overvoltage detection requirements. This application does not impose any further restrictions on the number of the above-mentioned second voltage zener diodes D4 and resistors R3.

[0064] As an optional implementation, please refer to Figure 6 , which is a fourth application embodiment of the wiring harness sequence detection circuit provided in an embodiment of the present application, the above-mentioned second direction detection unit 20 can also be set to the form of a second voltage-stabilizing diode D4, a first voltage-stabilizing resistor R8 and a second light-emitting diode D2. Preferably, the cathode of the second voltage-stabilizing diode D4 is connected to the first access terminal 1, the anode of the second voltage-stabilizing diode D4 is connected to the second access terminal 2, and the second light-emitting diode D2 is connected to the first voltage-stabilizing resistor R8 and then arranged in parallel at both ends of the second voltage-stabilizing diode D4. The second light-emitting diode D2 is protected by the second voltage-stabilizing diode D4.

[0065] In the embodiment of the present application, the first direction detection unit 10 is used to detect whether the first access terminal 1 and the second access terminal 2 are reversely connected. When the first access terminal 1 and the second access terminal 2 are reversely connected, the anti-reverse connection unit 30 is cut off to prevent the reverse current from damaging other components in the circuit. The second direction detection unit 20 is used to detect whether there is an overvoltage between the first access terminal 1 and the second access terminal 2. An output indication unit 40 is also provided to indicate whether the connection between the first access terminal 1 and the second access terminal 2 is normal.

[0066] In some optional embodiments, please refer to Figure 2 , which is a schematic diagram of the structure of the wiring harness sequence detection circuit provided in the embodiment of the present application Figure 2 The output indication unit 40 can be set in parallel at both ends of the second direction detection unit 20. The output indication unit 40 includes a third light-emitting diode D3. When the voltage across the first access terminal 1 and the second access terminal 2 is equal to a preset voltage, that is, when the connection between the first access terminal 1 and the second access terminal 2 is normal, the third light-emitting diode D3 is turned on and emits light.

[0067] As an optional implementation, please continue to refer to Figure 3 The above-mentioned output indication unit 40 also includes a second unidirectional conductive element and a third unidirectional conductive element. The first end of the second unidirectional conductive element is connected to the third end of the third unidirectional conductive element, the third end of the second unidirectional conductive element is connected to the positive electrode of the second direction detection unit 20, the first end of the third unidirectional conductive element is connected to the positive electrode of the third light-emitting diode D3, and the cathode of the third light-emitting diode D3 is connected to the second end of the second unidirectional conductive element and the second end of the third unidirectional conductive element.

[0068] Furthermore, the first end of the third unidirectional conductive element is connected to the first resistor R6 and then to the positive electrode of the third light-emitting diode D3. The second end of the second unidirectional conductive element and the second end of the third unidirectional conductive element are connected together and then connected to the second resistor R5. The other end of the second resistor R5 is connected to the negative electrode of the third light-emitting diode D3.

[0069] More preferably, the present application connects the third end of the second unidirectional conductive element to the positive electrode of the second direction detection unit 20 through the resistor R4, or connects the resistor R4 and the negative electrode of the second voltage-stabilizing diode D4 together and then connects to the resistor R3, and connects the resistor R3 and the second end of the second unidirectional conductive element together and then connects them to the first access terminal 1.

[0070] In the embodiment of the present application, when the voltage across the first access terminal 1 and the second access terminal 2 is equal to the preset voltage, also taking the preset voltage as 3.2V as an example, when the voltage across the first access terminal 1 and the second access terminal 2 is equal to 3.2V, since the second direction detection unit 20 is provided with a second voltage regulator diode D4, the conduction voltage drop of the second voltage regulator diode D4 is approximately 3.7V, which is greater than the preset voltage 3.2V, resulting in the second unidirectional conductive element not meeting the conduction condition and being in the off state.

[0071] The second end of the third unidirectional conductive element is connected to the second end of the second unidirectional conductive element and then connected to the first access terminal 1. The third end of the third unidirectional conductive element is connected to the second resistor R5 and then connected to the second access terminal 2. Therefore, the third unidirectional conductive element is turned on, and the third light-emitting diode D3 is in a light-emitting state, indicating that the connection between the first access terminal 1 and the second access terminal 2 is normal.

[0072] In an embodiment of the present application, a first direction detection unit 10 is used to detect whether the first access terminal 1 and the second access terminal 2 are reversely connected. When the first light-emitting diode D1 is illuminated, it indicates that there is a reverse connection between the first access terminal 1 and the second access terminal 2. When the first access terminal 1 and the second access terminal 2 are reversely connected, the anti-reverse connection unit 30 is cut off to prevent the reverse current from damaging other components in the circuit. The second direction detection unit 20 is used to detect whether there is an overvoltage between the first access terminal 1 and the second access terminal 2. When the second light-emitting diode D2 is illuminated, it indicates that there is an overvoltage between the first access terminal 1 and the second access terminal 2, that is, there is a fault in the wiring method between the first access terminal 1 and the second access terminal 2, and further maintenance is required. An output indication unit 40 is also provided to indicate whether the wiring between the first access terminal 1 and the second access terminal 2 is normal. When the third light-emitting diode D3 is illuminated, it indicates that the wiring between the first access terminal 1 and the second access terminal 2 is normal.

[0073] Of course, only the first direction detection unit 10 and the second direction detection unit 20 may be provided to detect whether there is reverse connection and overvoltage between the first access terminal 1 and the second access terminal 2. In principle, when there is no reverse connection and overvoltage between the first access terminal 1 and the second access terminal 2, it is assumed that the connection between the first access terminal 1 and the second access terminal 2 is normal. Of course, on this basis, the output indication unit 40 may be provided to indicate whether the connection between the first access terminal 1 and the second access terminal 2 is normal, so that the detection result is more intuitive.

[0074] It can be understood that the above-mentioned second unidirectional conductive element and the third unidirectional conductive element can also be set as a transistor or a field-effect transistor. The transistor can be an NPN transistor or a PNP transistor, and the field-effect transistor can be an enhancement NMOS transistor, a depletion NMOS transistor, an enhancement PMOS transistor, or a depletion PMOS transistor. In principle, the second unidirectional conductive element and the third unidirectional conductive element should have three ports, a first end, a second end, and a third end, and have unidirectional conduction characteristics. This application does not further limit the specific setting form of the above-mentioned second unidirectional conductive element and the third unidirectional conductive element.

[0075] For example, please refer to Figure 8 , which is the sixth application embodiment of the wiring harness wiring sequence detection circuit provided in the embodiments of the present application. When the second unidirectional conductive element and the third unidirectional conductive element are set to P-type transistor Q1 and P-type transistor Q2, it can be observed that the first end, second end and third end of the second unidirectional conductive element correspond to the collector, emitter and base of the transistor Q1, respectively, and the first end, second end and third end of the third unidirectional conductive element correspond to the collector, emitter and base of the transistor Q2, respectively.

[0076] Furthermore, the base of the transistor Q1 is connected to a resistor R4, which is connected to the cathode of the second voltage-stabilizing diode D4 and then to a resistor R3. The other end of the resistor R3 is connected to the emitter of the transistor Q1 and the emitter of the transistor Q2 and then to the first access terminal 1. The collector of the transistor Q1 and the base of the transistor Q2 are connected to a resistor R5. The collector of the transistor Q2 is connected to a resistor R6 and a third light-emitting diode D3 in sequence. The resistor R5 and the cathode of the third light-emitting diode D3 are connected to the second access terminal 2.

[0077] As an optional implementation, please refer to Figure 7 , which is the fifth application embodiment of the wiring harness sequence detection circuit provided in the embodiments of the present application. When the second unidirectional conductive element and the third unidirectional conductive element are set as PMOS tube Q1 and PMOS tube Q2, the first end, second end and third end of the above-mentioned second unidirectional conductive element correspond to the drain, source and gate of the PMOS tube Q1 respectively, and the first end, second end and third end of the third unidirectional conductive element correspond to the drain, source and gate of the PMOS tube Q2 respectively.

[0078] Furthermore, the gate of the PMOS transistor Q1 is connected to a resistor R4, which is connected to the cathode of the second voltage stabilizing diode D4 and then to a resistor R3. The other end of the resistor R3 is connected to the source of the PMOS transistor Q1 and the source of the PMOS transistor Q2 and then to the first access terminal 1. The drain of the PMOS transistor Q1 and the gate of the PMOS transistor Q2 are connected to a resistor R5. The drain of the PMOS transistor Q2 is connected to a resistor R6 and a third light-emitting diode D3 in sequence. The resistor R5 and the cathode of the third light-emitting diode D3 are connected to the second access terminal 2.

[0079] Of course, the first, second, and third unidirectional conductive elements may all be configured as triodes, or may all be configured as field-effect transistors. The first, second, and third unidirectional conductive elements may also be configured as triodes, and the second and third unidirectional conductive elements may both be configured as field-effect transistors. The first, second, and third unidirectional conductive elements may also be configured as field-effect transistors, and the second and third unidirectional conductive elements may both be configured as triodes. Of course, the first, second, and third unidirectional conductive elements may also be configured as other unidirectional conductive elements as required. In principle, the unidirectional conductive elements should have a first end, a second end, and a third end, and satisfy the wiring relationship described above. The above configurations of the first, second, and third unidirectional conductive elements are all feasible, and this application does not impose any further restrictions thereon.

[0080] As an optional implementation, please continue to refer to Figure 8 A voltage regulator diode D6 can also be provided to protect the first light-emitting diode D1 in the first direction detection unit 10. It can be observed that the voltage regulator diode D6 is provided in parallel on both sides of the resistor R1 and the first light-emitting diode D1, and the positive electrode of the first light-emitting diode D1 is connected to the resistor R9 and then connected to the second access terminal 2.

[0081] In an optional embodiment, the first light-emitting diode D1 corresponds to a first color, the second light-emitting diode D2 corresponds to a second color different from the first color, and the third light-emitting diode D3 corresponds to a third color different from the first color and the second color. In this way, the connection status between the first access terminal 1 and the second access terminal 2 can be effectively indicated by the first color, the second color and the third color.

[0082] Furthermore, elements capable of emitting indication signals may be provided in the first direction detection unit 10, the second direction detection unit 20 and the output indication unit 40, such as speakers, display screens and other elements cooperating with light-emitting diodes for indication. For example, a speaker is provided in the first direction detection unit 10. When the first light-emitting diode D1 in the first direction detection unit 10 is turned on and emits light, the speaker cooperates with the first light-emitting diode D1 to provide a sound prompt, so that the user is aware of the reverse connection between the first access terminal 1 and the second access terminal 2 in the first time.

[0083] By way of example, the above optional implementation manner will now be described again with reference to the accompanying drawings.

[0084] Please continue to refer to Figure 8 In this application, the first unidirectional conductive element is set as a field effect transistor Q3, the second unidirectional conductive element is set as a transistor Q1, and the third unidirectional conductive element is set as a transistor Q2. A voltage regulator diode D5 is set between the source and gate of the field effect transistor Q3 to protect the field effect transistor Q3. A voltage regulator diode D6 is set at both ends of the first light-emitting diode D1 and the resistor R1 to protect the first light-emitting diode D1. A voltage regulator diode D4 is set at both ends of the second light-emitting diode D2 and the resistor R8 to protect the second light-emitting diode D2.

[0085] Please refer to Figure 9 , which is the seventh application embodiment of the wiring harness sequence detection circuit provided by the embodiment of the present application, the present application sets the first unidirectional conductive element as a transistor Q3, the second unidirectional conductive element as a field effect transistor Q1, and the third unidirectional conductive element as a field effect transistor Q2. The base of the transistor Q3 is connected to a resistor R7, and a voltage stabilizing diode D5 is connected in parallel at both ends of the transistor Q3 and the resistor R7, thereby V be Overvoltage protection is performed; similarly, a voltage regulator diode D6 is provided at both ends of the first light-emitting diode D1 and the resistor R1 to protect the first light-emitting diode D1, and a voltage regulator diode D4 is provided at both ends of the second light-emitting diode D2 and the resistor R8 to protect the second light-emitting diode D2.

[0086] Therefore, this application is in the above appendix Figure 8 and attached Figure 9 In the application embodiment, overvoltage protection is provided for the first light-emitting diode D1, the second light-emitting diode D2 and the first unidirectional conductive element to prevent the components in the circuit from burning out when the voltage is too high.

[0087] Of course, other circuit structures can also be used to provide overvoltage protection for the first light-emitting diode D1, the second light-emitting diode D2 and the first unidirectional conductive element, thereby improving the durability of the wiring harness sequence detection circuit and making it suitable for more stringent application scenarios.

[0088] Based on the above-mentioned wiring harness sequence detection circuit, the present application also provides a wiring harness sequence detection device, which is used for wiring sequence detection of battery modules. The battery module is the basic component unit of the energy storage system, usually consisting of a battery pack, a voltage acquisition wiring harness, a temperature acquisition wiring harness and a battery management system. The present application takes the voltage acquisition wiring harness as an example. Once a sequence error occurs during the production process of the voltage acquisition wiring harness, the battery management system will not work or even burn out. Therefore, the wiring sequence detection of the voltage acquisition wiring harness is a very important production test link, and the wiring harness sequence detection device provided by the present application can effectively detect the wiring sequence of the voltage acquisition wiring harness.

[0089] There are usually several battery packs in the battery module. Figure 10 , which is the first application example of the wiring harness sequence detection device provided by the embodiment of the present application, taking the battery module as an example with five battery packs, and the battery voltage of each battery pack is 3.2V, it can be observed that Figure 10 There was incorrect wiring between the voltage collection harness at the negative end of the second battery pack and the voltage collection harness at the negative end of the fourth battery pack, resulting in an overvoltage of 9.6V at both ends of the second and fifth battery packs, and a negative voltage of -3.2V at both ends of the third and fourth battery packs.

[0090] Similarly, please refer to Figure 11-13 , Figure 11 This is the second application example of the wiring harness sequence detection device provided in the embodiment of the present application. Figure 12 This is the third application example of the wiring harness sequence detection device provided in the embodiment of the present application. Figure 13 This is the fourth application embodiment of the wiring harness sequence detection device provided in the embodiment of the present application. The five battery packs in the above application embodiments all have different incorrect wiring, resulting in different overvoltages or negative voltages at both ends of the battery pack. This application does not elaborate on the specific incorrect wiring situations.

[0091] The wiring harness sequence detection device provided in the present application, by connecting the first access terminal 1 of the wiring harness sequence detection device to the positive pole of the corresponding battery pack and the second access terminal 2 of the wiring harness sequence detection device to the negative pole of the corresponding battery pack, can visually display whether there is any incorrect wiring in the current battery pack, and specifically whether it is overvoltage, negative pressure or normal wiring, so that the operator can perform maintenance in time to avoid safety accidents and property losses caused by wiring errors.

[0092] It can be understood that when used, the first access terminal 1 and the second access terminal 2 of the wiring harness sequence detection device provided by the present application need to be connected to the positive and negative poles of the corresponding battery pack respectively. When it is necessary to detect several battery packs in a battery module, the first access terminal 1 and the second access terminal 2 of the wiring harness sequence detection device provided by the present application need to be connected to the positive and negative poles of the corresponding battery pack in turn. When the first light-emitting diode D1 is lit, it indicates that the current battery pack is reversely connected. When the first access terminal 1 and the second access terminal 2 are reversely connected, the anti-reverse connection unit 30 is cut off to prevent the reverse current from damaging other components in the circuit. When the second light-emitting diode D2 is lit, it indicates that there is an overvoltage due to wiring error between the first access terminal 1 and the second access terminal 2. When the third light-emitting diode D3 is lit, it indicates that the wiring between the first access terminal 1 and the second access terminal 2 is normal. The detection results are intuitively displayed through the first light-emitting diode D1, the second light-emitting diode D2 and the third light-emitting diode D3.

[0093] For other details about how the wiring harness sequence detection device implements the above technical solution, please refer to the description of the wiring harness sequence detection circuit provided in the above application embodiment, which will not be repeated here.

[0094] The wiring harness sequence detection circuit and detection device provided in the present application detect whether the battery pack between the first access terminal and the second access terminal is reversely connected through a first direction detection unit. When the first light-emitting diode is lit, it indicates that there is a negative voltage in the battery pack between the first access terminal and the second access terminal. At the same time, the anti-reverse connection unit is cut off to prevent the reverse current from damaging other components in the circuit. The wiring harness sequence detection circuit and detection device provided in the present application detect whether there is an overvoltage in the battery pack between the first access terminal and the second access terminal through a second direction detection unit. When the second light-emitting diode is lit, it indicates that there is an overvoltage between the first access terminal and the second access terminal, so that the operator can repair the wiring of the currently detected battery pack according to the lighting status of the first light-emitting diode and the second light-emitting diode. The present application can effectively screen whether there are wiring errors in the wiring sequence of the battery pack voltage acquisition wiring harness, and intuitively display the screening results. It has high reliability and effectively ensures the service life of the battery module.

[0095] In addition, the present application is also provided with an output indication unit. When the battery pack between the first access end and the second access end is correctly connected, the third light-emitting diode in the output indication unit is turned on and illuminated, thereby effectively screening the negative pressure incorrect wiring, overvoltage incorrect wiring and correct wiring of the battery pack voltage acquisition harness, and intuitively displaying the detection results to the operator, thereby improving the detection efficiency.

[0096] The above-described embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. A wiring harness sequence detection circuit, characterized in that: It includes a first direction detection unit, a second direction detection unit and an anti-reverse connection unit which are arranged in parallel between the first access terminal and the second access terminal; The cathode of the first direction detection unit is connected to the first access terminal, the anode of the first direction detection unit is connected to the second access terminal, the anode of the second direction detection unit is connected to the first access terminal, and the cathode of the second direction detection unit is connected to the second access terminal; The anti-reverse connection unit is provided between the first direction detection unit and the second direction detection unit, and is turned off when the first direction detection unit is turned on.

2. The wiring harness sequence detection circuit according to claim 1, wherein: The anti-reverse polarity unit includes a first unidirectional conductive element, a first end of the first unidirectional conductive element is connected to the negative pole of the second direction detection unit, a second end of the first unidirectional conductive element is connected to the positive pole of the first direction detection unit, and a third end of the first unidirectional conductive element is connected between the negative pole of the first direction detection unit and the positive pole of the second direction detection unit.

3. The wiring harness sequence detection circuit according to claim 2, wherein: The anti-reverse connection unit further includes a first voltage stabilizing diode, which is arranged in parallel between the second end of the first unidirectional conductive element and the third end of the first unidirectional conductive element; The anode of the first voltage stabilizing diode is connected to the second end of the first unidirectional conductive element, and the cathode of the first voltage stabilizing diode is connected to the third end of the first unidirectional conductive element.

4. The wiring harness sequence detection circuit according to claim 1, wherein: The first direction detection unit includes a first light emitting diode, wherein the cathode of the first light emitting diode is connected to the first access terminal, and the anode of the first light emitting diode is connected to the second access terminal; The second direction detection unit includes a second light emitting diode, wherein the anode of the second light emitting diode is connected to the first access terminal, and the cathode of the second light emitting diode is connected to the second access terminal.

5. The wiring harness sequence detection circuit according to claim 4, characterized in that: The second direction detection unit further includes a second zener diode connected to the second light emitting diode, a cathode of the second zener diode is connected to the first access terminal, and an anode of the second zener diode is connected to the anode of the second light emitting diode.

6. The wiring harness sequence detection circuit according to claim 4, characterized in that: The second direction detection unit also includes a second zener diode and a first zener resistor, the cathode of the second zener diode is connected to the first access end, and the anode of the second zener diode is connected to the second access end; the second light-emitting diode is connected to the first zener resistor and is arranged in parallel at both ends of the second zener diode.

7. The wiring harness sequence detection circuit according to claim 1, wherein: The wiring harness sequence detection circuit also includes an output indication unit arranged in parallel at both ends of the second direction detection unit, and the output indication unit includes a third light-emitting diode. When the voltage across the first access end and the second access end is equal to a preset voltage, the third light-emitting diode is turned on and emits light.

8. The wiring harness sequence detection circuit according to claim 7, wherein: The output indication unit further includes a second unidirectional conductive element and a third unidirectional conductive element; The first end of the second unidirectional conductive element is connected to the third end of the third unidirectional conductive element, the third end of the second unidirectional conductive element is connected to the positive electrode of the second direction detection unit, the first end of the third unidirectional conductive element is connected to the positive electrode of the third light-emitting diode, and the cathode of the third light-emitting diode is commonly connected to the second end of the second unidirectional conductive element and the second end of the third unidirectional conductive element.

9. The wiring harness sequence detection circuit according to claim 8, characterized in that: The first end of the third unidirectional conductive element is connected to the first resistor and then connected to the anode of the third light emitting diode; The second end of the second unidirectional conductive element and the second end of the third unidirectional conductive element are connected together and then connected to a second resistor, and the other end of the second resistor is connected to the cathode of the third light emitting diode.

10. A wiring harness sequence detection device, used for wiring sequence detection of battery modules, characterized in that: The wiring harness sequence detection device includes the wiring harness sequence detection circuit as described in any one of claims 1 to 9, the battery module is provided with several battery packs, the first access end of the wiring harness sequence detection device is connected to the positive pole of the corresponding battery pack, and the second access end of the wiring harness sequence detection device is connected to the negative pole of the corresponding battery pack.

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