A Method for Inspecting the High-Voltage Contactor of a Hybrid Electric Vehicle without Disassembly

Abstract

The present invention discloses a method for inspecting a high-voltage contactor of a hybrid electric vehicle without disassembly. The method of the present invention does not require disassembling the high-voltage battery pack, and can directly perform a non-direct contact inspection on the high-voltage contactor to accurately judge the faults of the high-voltage contactor assembly or what type of faults, and even which contactor has a fault. The effect is obvious, ensuring production safety, improving work efficiency, ensuring the quality of maintenance, and making up for the deficiencies of the existing technical methods.

Description

Technical Field

[0001] The present invention relates to the technical field of the maintenance of hybrid and electric vehicles, in particular to the technical field of a method for inspecting high-voltage contactors of hybrid and electric vehicles without disassembly. Background Art

[0002] A hybrid / electric vehicle battery assembly generally incorporates a high-voltage contactor assembly. It can not only connect and disconnect the circuit, but also play a role in release protection. It is applicable to circuits with large capacity, long distance, and frequent operation, and is an important electronic component in the high-voltage control system of high-voltage vehicle models. The high-voltage contactor assembly generally has 4 high-voltage contactors. The high-voltage contactor can connect the high-voltage DC battery to the vehicle or accommodate high-voltage direct current in the hybrid / electric vehicle battery assembly. The 4 high-voltage contactors include a main positive high-voltage contactor, a main negative high-voltage contactor, a charging positive high-voltage contactor, and a pre-charge negative high-voltage contactor. The contactors are closed and opened in a specified order controlled by the hybrid / electric vehicle powertrain control module.

[0003] Based on years of experience in the maintenance of new energy vehicles, the common faults of high-voltage contactors include: contactor coil faults, contactor contact faults, internal high-voltage line faults of the contactor, internal low-voltage control line faults of the contactor, and built-in fuse faults of the contactor, etc.

[0004] Currently, there are the following problems in the inspection of high-voltage contactor faults:

[0005] (1) Since the high-voltage contactor assembly is built into the hybrid / electric vehicle battery pack, it is often necessary to remove the high-voltage battery pack and disassemble it to inspect the high-voltage contactor to determine the fault. Because the high-voltage battery pack always has high voltage, there are certain safety hazards during disassembly and assembly, and non-standard operations will damage the vehicle and cause personal safety accidents.

[0006] (2) Currently, there is no good inspection method and process. Even the manufacturer's maintenance manual does not give the inspection process, and the maintenance technicians are blind, non-standard, and unscientific during inspection.

[0007] (3) The first-pass repair rate is low, and there are problems with the maintenance quality, and it is impossible to solve vehicle problems efficiently and accurately. Summary of the Invention

[0008] The purpose of the invention is to solve the problems in the prior art and propose a method for inspecting high-voltage contactors of hybrid and electric vehicles without disassembly, which can inspect the high-voltage contactors of hybrid and electric vehicles without disassembly.

[0009] To achieve the above purpose, the invention proposes a method for inspecting high-voltage contactors of hybrid and electric vehicles without disassembly, including the following steps:

[0010] Step S1: Turn off the vehicle ignition switch. After the vehicle goes into sleep mode, disconnect the low-voltage plug of the vehicle battery pack.

[0011] Step S2: Use a multimeter to measure whether the resistance from the pin of the electric vehicle battery pack for grounding to the ground is less than 2 ohms. If not, check whether the resistance of the line from the pin of the electric vehicle battery pack for grounding to the ground is too large or whether the grounding point is good.

[0012] Step S3: Disconnect the plug of the vehicle powertrain control module. Use a multimeter to measure whether the resistance between each pin of the battery pack and the corresponding pin in the vehicle powertrain control module is less than 1 ohm. If not, check whether the resistance of this line is too large.

[0013] Step S4: Connect the plug of the vehicle battery pack and measure respectively whether the resistance between each pin of the vehicle powertrain control module corresponding to the battery and the ground is normal. If not, judge that there is a fault in the coil of the corresponding high-voltage contactor or there is a fault in the internal line of the contactor in the contactor assembly, and the corresponding high-voltage contactor assembly or this high-voltage contactor needs to be replaced.

[0014] Step S5: Wear "personal safety protection equipment" and execute the high-voltage system deactivation procedure for the vehicle.

[0015] Step S6: Disconnect the DC / DC module high-voltage bus connector and the on-board charger high-voltage bus connector of the high-voltage line of the vehicle battery pack, and measure respectively whether the voltages of pins A and B of the DC / DC module and the on-board charger are close to the high-voltage battery voltage. If so, judge that the contacts of the battery charging system positive contactor and the battery negative contactor are stuck, and the high-voltage contactor assembly or this high-voltage contactor needs to be replaced.

[0016] Step S7: Disconnect the high-voltage bus connectors of each high-voltage component in the high-voltage line of the vehicle battery pack, and measure respectively whether the voltage between pins A and B of each high-voltage component is close to the high-voltage battery voltage. If so, judge that the contacts of the electric vehicle battery positive contactor and the battery negative contactor are stuck, and the high-voltage contactor assembly or this high-voltage contactor needs to be replaced. If it is close to half of the high-voltage battery voltage, judge that the contacts of the electric vehicle battery positive contactor and the pre-charge contactor are stuck, and the high-voltage contactor assembly or this high-voltage contactor needs to be replaced.

[0017] Step S8: Keep the vehicle executing the high-voltage system deactivation procedure and directly connect the pin of the vehicle automotive battery pack for grounding to the vehicle body ground for a short circuit.

[0018] Step S9: Use a jumper wire with a fuse to make cross-connections to the electric vehicle battery pack in sequence to check whether the contacts of each high-voltage contactor are good.

[0019] Preferably, step S9 includes the following steps:

[0020] Step S9-1: Use a jumper wire with a fuse to supply power to the pin on the electric vehicle battery pack corresponding to the positive contactor of the charging system to control the positive contactor of the charging system to close.

[0021] Step S9-2: Use another jumper wire with a fuse to supply power to the pin on the electric vehicle battery pack corresponding to the negative contactor to control the negative contactor to close.

[0022] Step S9-3: Measure whether the voltage between terminals A and B of the DC / DC module or on-board charger is the high-voltage battery voltage. If so, it is determined that the contacts of the positive and negative contactors of the battery charging system are closed normally. If the voltage is close to 0V, it is determined that the contacts of the positive and negative contactors of the battery charging system are not closed normally or there is a corresponding fuse failure inside the high-voltage contactor, and the high-voltage contactor assembly or the high-voltage contactor and fuse need to be replaced.

[0023] Preferably, step S9 further includes the following steps:

[0024] Step S9-4: Use a jumper wire with a fuse to supply power to the pin on the electric vehicle battery pack corresponding to the positive contactor to control the positive contactor to close.

[0025] Step S9-5: Use another jumper wire with a fuse to supply power to the pin on the electric vehicle battery pack corresponding to the negative contactor to control the negative contactor to close.

[0026] Step S9-6: Measure whether the voltage between terminals A and B of any high-voltage component is the high-voltage battery voltage. If so, it can be determined that the contacts of the positive and negative contactors are closed normally. If the voltage is close to 0V, it can be determined that the contacts of the positive and negative contactors are not closed normally or there is a corresponding fuse failure inside the high-voltage contactor, and the high-voltage contactor assembly or the high-voltage contactor and fuse need to be replaced.

[0027] Preferably, step S9 further includes the following steps:

[0028] Step S9-7: Use a jumper wire with a fuse to supply power to the pin on the electric vehicle battery pack corresponding to the pre-charge contactor to control the pre-charge contactor to close.

[0029] Step S9-8: Use another jumper wire with a fuse to supply power to the pin on the electric vehicle battery pack corresponding to the negative contactor to control the negative contactor to close.

[0030] Step S9-8: Measure whether the voltages of terminals A and B of any high-voltage component are much lower than the high-voltage battery voltage but much higher than 12V. If so, it is determined that the contacts of the pre-charge contactor and the negative contactor are normally closed. If the voltage is close to 0V, it is determined that the contacts of the pre-charge contactor and the negative contactor are not normally closed or there is a corresponding fuse failure inside the high-voltage contactor, and the high-voltage contactor assembly or the high-voltage contactor and fuse need to be replaced.

[0031] Preferably, the power supply voltage connected by the jumper wire with a fuse is 12V.

[0032] Preferably, the personal safety protection equipment includes insulating gloves. The insulating gloves include a glove body and a replaceable working part. Both the glove body and the replaceable working part are insulating. The glove body includes a five-finger part, a palm part integrally connected to the five-finger part, and a sleeve part integrally connected to the palm part. The replaceable working part is detachably provided on the side of the palm part and the five-finger part close to the palm. The replaceable working part includes a replaceable palm adapted to the palm part and replaceable finger parts integrally connected to the palm part. An upper window for the five-finger part and the palm part to extend into is provided on the upper side of the replaceable palm and the replaceable finger parts. A sleeve cavity for socketing and cooperating with the ends of the five-finger part is provided at the end of the replaceable finger parts. A plurality of mutually cooperating magic tape female stickers and magic tape male stickers are respectively provided on the palm part and the replaceable palm.

[0033] Preferably, a plurality of anti-cutting wires arranged vertically and horizontally are laid inside the replaceable working part, and the anti-cutting wires are insulating.

[0034] Preferably, an anti-electric shock indicating mechanism is further provided on the glove body and the replaceable working part. The anti-electric shock indicating mechanism includes an alarm fixed on the sleeve part, a first insulating cable laid on the outer wall of the sleeve part and electrically connected to the alarm, a contact provided on the outer wall of the replaceable finger part, and a second insulating cable laid on the outer wall of the replaceable working part and electrically connected to the contact. The second insulating cable is detachably electrically connected to the first insulating cable. A protection circuit is provided inside the alarm, and the first insulating cable is electrically connected to the alarm through the protection circuit.

[0035] Preferably, a first connector electrically connected to the second insulating cable is provided on the second insulating cable, and a second connector detachably connected to the first connector is provided on the first insulating cable.

[0036] Preferably, the alarm is any one or a combination of a vibration alarm, a buzzer alarm, and a light alarm.

[0037] Beneficial effects of an inspection method for high-voltage contactors of hybrid and electric vehicles without disassembly: The method of the present invention can directly inspect the high-voltage contactors in a non-direct contact manner without disassembling the high-voltage battery pack, so as to accurately judge the faults of the high-voltage contactor assembly or what type of faults, and even which contactor has a fault. The effect is obvious, ensuring production safety, improving work efficiency, ensuring the quality of maintenance, and making up for the deficiencies of the existing technical methods.

[0038] The features and advantages of the invention will be described in detail through embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the control part of the high-voltage contactor of the hybrid / electric vehicle battery pack.

[0040] Figure 2 It is a schematic diagram of the high-voltage circuit of the hybrid / electric vehicle battery pack.

[0041] Figure 3 It is a view of the multimeter reading when the voltages of pins A and B of the DC / DC module in the embodiment are close to the high-voltage battery voltage.

[0042] Figure 4 It is a view of the multimeter reading when the voltage of the high-voltage component in the embodiment is close to the high-voltage battery pack voltage.

[0043] Figure 5 It is a view of the multimeter reading when measuring the built-in high-voltage contactor in the embodiment.

[0044] Figure 6 It is a front view structural schematic diagram of the insulating glove in the second embodiment.

[0045] Figure 7 It is a bottom view structural schematic diagram of the glove body in the second embodiment.

[0046] Figure 8 It is a front view structural schematic diagram of the replaceable working part in the second embodiment.

[0047] Figure 9 It is a bottom view structural schematic diagram of the replaceable working part in the second embodiment.

[0048] Among them:

[0049] 1 - glove body; 2 - replaceable working part; 3 - female hook and loop fastener; 4 - male hook and loop fastener; 5 - alarm; 6 - first insulating cable; 7 - contact; 8 - second insulating cable; 11 - finger part; 12 - palm part; 13 - sleeve part; 21 - replaceable palm; 22 - replaceable finger part; 23 - upper window; 81 - first connector; 91 - second connector. Embodiments

[0050] To make the objectives, technical solutions, and advantages of the invention more clear, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concept of the invention.

[0051] In the description of the invention, it should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0052] In the description of the invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation on the invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the invention, the meaning of "a plurality" is two or more, unless otherwise specifically defined. The meaning of "several" is one or more, unless otherwise specifically defined.

[0053] In the description of the invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the invention can be understood according to specific circumstances. Embodiment

[0054] Refer to Figure 1 、 Figure 2 When the method for non-detachable inspection of high-voltage contactors of a hybrid electric vehicle of the present invention is used for detecting the high-voltage contactors of this type of vehicle, it includes the following steps:

[0055] Step S1, turn off the vehicle ignition switch. After the vehicle goes to sleep, disconnect the low-voltage plug of the vehicle battery pack.

[0056] Step S2, use a multimeter to measure whether the resistance from the pin for grounding of the electric vehicle battery pack, i.e., the 5th pin, to the ground is less than 2 ohms. If not, check whether the line resistance from the 5th pin of the electric vehicle battery pack to the ground is too large or whether the grounding point is good.

[0057] Step S3, disconnect the plug of the vehicle powertrain control module, and use a multimeter to measure respectively whether the resistances between the 1st, 2nd, 3rd, and 4th pins of the battery pack and the 1st, 2nd, 3rd, and 4th pins in the vehicle powertrain control module are less than 1 ohm. If not, then check whether the line resistance is too large.

[0058] Step S4, connect the plug of the vehicle battery pack, and measure whether the resistance from the pin corresponding to the charging system positive contactor in the vehicle powertrain control module, i.e., the 1st pin, to the ground is normal. For the specific resistance value, refer to the repair manual or the resistance value of similar relays. If not, it can be judged that there is a fault in the charging system positive contactor coil or the internal circuit of this contactor in the contactor assembly, and the corresponding high-voltage contactor assembly or this high-voltage contactor needs to be replaced.

[0059] Connect the plug of the electric vehicle battery pack, and measure the resistance from the 2nd pin corresponding to the pre-charge contactor coil in the electric vehicle powertrain control module to the ground. Whether the pre-charge contactor coil resistance is normal. For the specific resistance value, refer to the repair manual or the resistance value of similar relays. If not, it can be judged that there is a fault in the pre-charge contactor coil or the internal circuit of this contactor in the contactor assembly, and the high-voltage contactor assembly or this high-voltage contactor needs to be replaced.

[0060] Connect the plug of the electric vehicle battery pack, and measure the resistance from the 3rd pin corresponding to the positive contactor coil in the electric vehicle powertrain control module to the ground. Whether the positive contactor coil resistance is normal. For the specific resistance value, refer to the repair manual or the resistance value of similar relays. If not, it can be judged that there is a fault in the positive contactor coil or the internal circuit of this contactor in the contactor assembly, and the high-voltage contactor assembly or this high-voltage contactor needs to be replaced.

[0061] Connect the plug of the electric vehicle battery pack, and measure whether the resistance from the 4th pin corresponding to the negative contactor in the electric vehicle powertrain control module to the ground is normal. For the specific resistance value, refer to the repair manual or the resistance value of similar relays. If not, it can be judged that there is a fault in the negative contactor coil or the internal circuit of this contactor in the contactor assembly, and the high-voltage contactor assembly or this high-voltage contactor needs to be replaced. Step 4 is used to quickly check whether the 4 high-voltage contactor coils and the control circuits are good.

[0062] Step S5, put on the "personal safety protection equipment", such as safety glasses with side protection, the latest certified "0" - level insulating gloves, insulating shoes, etc.; execute the high - voltage system deactivation procedure for the vehicle;

[0063] Step S6, disconnect the DC / DC module high - voltage bus connector and the on - vehicle charger high - voltage bus connector of the high - voltage line of the vehicle battery pack, and measure whether the voltages of pins A and B of the DC / DC module and the on - vehicle charger are close to the high - voltage battery voltage respectively; if so, it is judged that the contacts of the battery charging system positive contactor and the battery negative contactor are stuck, and the high - voltage contactor assembly or this high - voltage contactor needs to be replaced; if Figure 3 As shown, the voltages of pins A and B of the DC / DC module are close to the high - voltage battery voltage, which is abnormal;

[0064] Step S7, disconnect the high - voltage bus connectors of high - voltage component A, high - voltage component B, and high - voltage component C in the high - voltage line of the vehicle battery pack, and measure whether the voltages between pins A and B of each high - voltage component are close to the high - voltage battery voltage respectively; if so, it is judged that the contacts of the electric - vehicle battery positive contactor and the battery negative contactor are stuck, and the high - voltage contactor assembly or this high - voltage contactor needs to be replaced; if it is close to half of the high - voltage battery voltage, it is judged that the contacts of the electric - vehicle battery positive contactor and the pre - charge contactor are stuck, and the high - voltage contactor assembly or this high - voltage contactor needs to be replaced; if Figure 4 As shown, the voltage of high - voltage component A is close to the high - voltage battery pack voltage, which is abnormal; this step is used to check whether there are faults in the contacts of 4 high - voltage contactors;

[0065] Step S8, still wear the "personal safety equipment", such as safety glasses with side protection, the latest certified "0" - level insulating gloves, insulating shoes, etc.; keep the vehicle executing the high - voltage system deactivation procedure, and directly connect the pin for grounding of the vehicle's automotive battery pack, that is, the 5th pin, to the vehicle body ground for short - circuit;

[0066] Step S9, use a jumper wire with a fuse to cross - connect the electric - vehicle battery pack in sequence to check whether the contacts of each high - voltage contactor are in good condition; specifically including:

[0067] Step S9 - 1, use a jumper wire with a fuse to supply power to the pin corresponding to the charging system positive contactor on the electric - vehicle battery pack, that is, the 1st pin, with a supply voltage of 12V to control the charging system positive contactor to close;

[0068] Step S9 - 2, use another jumper wire with a fuse to supply power to the pin corresponding to the negative contactor on the electric - vehicle battery pack, that is, the 4th pin, with a supply voltage of 12V to control the negative contactor to close;

[0069] Step S9-3: Measure whether the voltages of terminals A and B of the DC / DC module or on-vehicle charger are equal to the high-voltage battery voltage. If so, it is determined that the contacts of the positive and negative contactors of the battery charging system are normally closed. If the voltage is close to 0V, it is determined that the contacts of the positive and negative contactors of the battery charging system are not normally closed or there is a fault in the corresponding fuse inside the high-voltage contactor, and the high-voltage contactor assembly or the high-voltage contactor and fuse need to be replaced.

[0070] Step S9-4: Keep the 5th pin of the battery pack directly short-circuited to the vehicle body ground. Use a jumper wire with a fuse to supply power to the pin corresponding to the positive contactor on the electric vehicle battery pack, i.e., the 3rd pin, with a supply voltage of 12V to control the positive contactor to close.

[0071] Step S9-5: Use another jumper wire with a fuse to supply power to the pin corresponding to the negative contactor on the electric vehicle battery pack, i.e., the 4th pin, with a supply voltage of 12V to control the negative contactor to close.

[0072] Step S9-6: Measure whether the voltages of terminals A and B of high-voltage component A, high-voltage component B, or high-voltage component C are equal to the high-voltage battery voltage. If so, it can be determined that the contacts of the positive and negative contactors are normally closed. If the voltage is close to 0V, it can be determined that the contacts of the positive and negative contactors are not normally closed or there is a fault in the corresponding fuse inside the high-voltage contactor, and the high-voltage contactor assembly or the high-voltage contactor and fuse need to be replaced.

[0073] Step S9-7: Keep the 5th pin of the battery pack directly short-circuited to the vehicle body ground. Use a jumper wire with a fuse to supply power to the pin corresponding to the pre-charge contactor on the electric vehicle battery pack, i.e., the 2nd pin, with a supply voltage of 12V to control the pre-charge contactor to close.

[0074] Step S9-8: Use another jumper wire with a fuse to supply power to the pin corresponding to the negative contactor on the electric vehicle battery pack, i.e., the 4th pin, with a supply voltage of 12V to control the negative contactor to close.

[0075] Step S9-8: Measure whether the voltages of terminals A and B of any high-voltage component are much lower than the high-voltage battery voltage but much higher than 12V. If so, it is determined that the contacts of the pre-charge contactor and the negative contactor are normally closed. If the voltage is close to 0V, it is determined that the contacts of the pre-charge contactor and the negative contactor are not normally closed or there is a fault in the corresponding fuse inside the high-voltage contactor, and the high-voltage contactor assembly or the high-voltage contactor and fuse need to be replaced. If Figure 5It shows whether the built-in fuse of the high-voltage contactor is in good condition. This step is used to check whether the 4 high-voltage contactor contacts are in good condition. Through this operation method, it is possible to check the high-voltage contactor in a non-direct contact manner without disassembling the high-voltage battery pack on the vehicle, so as to accurately judge the faults of the high-voltage contactor assembly or what type of faults, and even which contactor has a fault. The effect is obvious, ensuring production safety, improving work efficiency, ensuring maintenance quality, and making up for the deficiencies of existing technical methods. Embodiment

[0076] Refer to Figures 6 - 9 , in order to protect the safety of operators, the personal safety protection equipment described in this embodiment includes insulating gloves. The insulating gloves include a glove body 1 and a replaceable working part 2. Both the glove body 1 and the replaceable working part 2 are insulating. The glove body 1 includes a five-finger part 11, a palm part 12 integrally connected to the five-finger part 11, and a sleeve part 13 integrally connected to the palm part 12. The replaceable working part 2 is detachably arranged on the side of the palm part 12 and the five-finger part 11 close to the palm. The replaceable working part 2 includes a replaceable palm 21 adapted to the palm part 12 and a replaceable finger part 22 integrally connected to the palm part 12. An upper window 23 for the five-finger part 11 and the palm part 12 to extend into is provided on the upper side of the replaceable palm 21 and the replaceable finger part 22. A sleeve cavity for socketing and cooperating with the end of the five-finger part 11 is provided at the end of the replaceable finger part 22. A plurality of mutually cooperating magic tape female stickers 3 and magic tape male stickers 4 are respectively provided on the palm part 12 and the replaceable palm 21. In this embodiment, by setting the hand position of the glove body 1 with a detachably connected replaceable working part 2, the glove body 1 and the replaceable working part 2 provide double protection, with better protection performance and better insulation performance, and also avoid damage. The replaceable working part 2 is detachably connected to the glove body 1 and can be replaced at any time. It is specially designed for the field of vehicle maintenance in this application to avoid oil stains sticking to the gloves and affecting their use and insulation performance. When installing the replaceable working part 2, each sleeve cavity is respectively sleeved on each finger end of the five-finger part 11, and then the replaceable working part 2 is fixed to the glove body 1 through the magic tape female stickers 3 and the magic tape male stickers 4. The installation and disassembly are convenient and can be repeated multiple times.

[0077] Preferably, a plurality of anti-cutting lines arranged vertically and horizontally are laid in the replaceable working part 2, and the anti-cutting lines are insulating. This can prevent sharp and pointed objects from cutting through the replaceable working part 2 and affecting its insulation performance. Embodiment

[0078] Refer to Figures 6 - 9, an anti-electric shock indicating mechanism is also provided on the glove body 1 and the replaceable working part 2. The anti-electric shock indicating mechanism includes an alarm 5 fixedly arranged on the sleeve part 13, a first insulating cable 6 laid on the outer wall of the sleeve part 13 and electrically connected to the alarm 5, a contact 7 arranged on the outer wall of the replaceable finger part 22, and a second insulating cable 8 laid on the outer wall of the replaceable working part 2 and electrically connected to the contact 7. The second insulating cable 8 is detachably electrically connected to the first insulating cable 6. A protection circuit is arranged in the alarm 5, and the first insulating cable 6 is electrically connected to the alarm 5 through the protection circuit. The anti-electric shock indicating mechanism can remind the operator whether the contact position is electrified, warn the operator, and improve the operator's attention. When the operator wears the glove of the present application and touches an electrified object, the contact 7 contacts the electrified object and is transmitted to the alarm 5 through the protection circuit, and the alarm 5 emits an alarm signal to remind the operator.

[0079] Refer to Figure 6 , a first joint 81 electrically connected to the second insulating cable 8 is arranged on the second insulating cable 8, and a second joint 91 detachably connected to the first joint 81 is arranged on the first insulating cable 6. It is convenient to replace the replaceable working part 2. When replacing the new replaceable working part 2, only need to connect the first joint 81 of the replaceable working part 2 with the second joint 91, and the anti-electric shock indicating mechanism can work normally.

[0080] Preferably, the alarm 5 is a combination of a vibration alarm, a buzzer alarm, and a light alarm.

[0081] Preferably, adhesive surfaces that are adhesively bonded to each other are provided on the surface of the palm part 12 and the surface of the replaceable palm 21. The adhesive surfaces can be adhesively bonded to each other to improve the connection stability, make the connection more fitting, and facilitate operation.

[0082] The standard parts used in this application document can all be purchased from the market. The specific connection methods of each part all adopt conventional means such as bolts, rivets, and welding that are mature in the prior art. The electric slide rail slider, cylinder, welding machine, electric telescopic rod, and internal components of the controller all adopt conventional models in the prior art, and their internal structures belong to the prior art structures. Workers can complete the normal operation of them according to the prior art manual. Coupled with the circuit connection adopting the conventional connection method in the prior art, no specific description will be made here.

[0083] It should be noted that although the above-mentioned embodiments have been described in this article, the patent protection scope of the invention is not limited thereby. Therefore, based on the innovative concept of the invention, the changes and modifications made to the embodiments described in this article, or the equivalent structural or equivalent process transformations made by using the content of the invention specification and drawings, directly or indirectly applying the above technical solutions to other related technical fields, are all included in the protection scope of the invention patent.

Claims

1. A method for inspecting a high-voltage contactor of a hybrid electric vehicle without disassembly, characterized in that, It includes the following steps: Step S1: After turning off the vehicle ignition switch and the vehicle goes to sleep, disconnect the low-voltage plug of the vehicle battery pack. Step S2: Use a multimeter to measure whether the resistance from the pin of the electric vehicle battery pack for grounding to the ground is less than 2 ohms; if not, check whether the line resistance from the pin of the electric vehicle battery pack for grounding to the ground is too large or whether the grounding point is good. Step S3: Disconnect the plug of the vehicle powertrain control module, and use a multimeter to measure whether the resistance between each pin of the battery pack and the corresponding pin in the vehicle powertrain control module is less than 1 ohm; if not, check whether the line resistance is too large. Step S4: Connect the plug of the vehicle battery pack, and measure whether the resistance from the pin in the vehicle powertrain control module corresponding to the positive contactor of the charging system to the ground is normal. If not, it can be judged that there is a fault in the coil of the positive contactor of the charging system or there is a fault in the internal circuit of this contactor in the contactor assembly, and the corresponding high-voltage contactor assembly or this high-voltage contactor needs to be replaced. Connect the plug of the electric vehicle battery pack, and measure whether the resistance from the pin in the electric vehicle powertrain control module corresponding to the pre-charge contactor coil to the ground (the resistance of the pre-charge contactor coil) is normal. If not, it can be judged that there is a fault in the coil of the pre-charge contactor or there is a fault in the internal circuit of this contactor in the contactor assembly, and the high-voltage contactor assembly or this high-voltage contactor needs to be replaced. Connect the plug of the electric vehicle battery pack, and measure whether the resistance from the pin in the electric vehicle powertrain control module corresponding to the positive contactor coil to the ground (the resistance of the positive contactor coil) is normal; if not, it can be judged that there is a fault in the coil of the positive contactor or there is a fault in the internal circuit of this contactor in the contactor assembly, and the high-voltage contactor assembly or this high-voltage contactor needs to be replaced. Connect the plug of the electric vehicle battery pack, and measure whether the resistance from the pin in the electric vehicle powertrain control module corresponding to the negative contactor to the ground is normal; if not, it can be judged that there is a fault in the coil of the negative contactor or there is a fault in the internal circuit of this contactor in the contactor assembly, and the high-voltage contactor assembly or this high-voltage contactor needs to be replaced. Step S5: Wear "personal safety protection equipment" and execute the high-voltage system deactivation procedure for the vehicle. Step S6: Disconnect the DC / DC module high-voltage bus connector and the on-board charger high-voltage bus connector of the high-voltage line of the vehicle battery pack, and respectively measure whether the voltages of pins A and B of the DC / DC module and the on-board charger are close to the high-voltage battery voltage; if so, it is judged that the contacts of the positive contactor of the battery charging system and the negative contactor of the battery are stuck, and the high-voltage contactor assembly or this high-voltage contactor needs to be replaced. Step S7: Disconnect the high-voltage bus connectors of each high-voltage component in the high-voltage line of the vehicle battery pack, and respectively measure whether the voltage between pins A and B of each high-voltage component is close to the high-voltage battery voltage; if so, it is judged that the contacts of the positive contactor of the electric vehicle battery and the negative contactor of the battery are stuck, and the high-voltage contactor assembly or this high-voltage contactor needs to be replaced; if it is close to half of the high-voltage battery voltage, it is judged that the contacts of the positive contactor of the electric vehicle battery and the pre-charge contactor are stuck, and the high-voltage contactor assembly or this high-voltage contactor needs to be replaced. Step S8, keep the vehicle executing the high-voltage system deactivation procedure, and directly connect the pin of the vehicle's automotive battery pack for grounding to the vehicle body ground for a short circuit. Step S9, use a fuse-equipped jumper wire to cross-connect the electric vehicle battery pack in sequence to check whether the contacts of each high-voltage contactor are in good condition.

2. The method for inspecting a high-voltage contactor of a hybrid electric vehicle without disassembly according to claim 1, wherein, The said Step S9 includes the following steps: Step S9-1, use a fuse-equipped jumper wire to supply power to the pin on the electric vehicle battery pack corresponding to the positive contactor of the charging system to control the positive contactor of the charging system to close. Step S9-2, use another fuse-equipped jumper wire to supply power to the pin on the electric vehicle battery pack corresponding to the negative contactor to control the negative contactor to close. Step S9-3, measure whether the voltage between terminals A and B of the DC / DC module or on-board charger is the high-voltage battery voltage; if so, judge that the contacts of the positive and negative contactors of the battery charging system are closed normally, if the voltage is close to 0V, judge that the contacts of the positive and negative contactors of the battery charging system are not closed normally or there is a corresponding fuse fault inside the high-voltage contactor, and it is necessary to replace the high-voltage contactor assembly or the high-voltage contactor and fuse.

3. The method for inspecting a high-voltage contactor of a hybrid electric vehicle without disassembly according to claim 2, wherein The said Step S9 also includes the following steps: Step S9-4, use a fuse-equipped jumper wire to supply power to the pin on the electric vehicle battery pack corresponding to the positive contactor to control the positive contactor to close. Step S9-5, use another fuse-equipped jumper wire to supply power to the pin on the electric vehicle battery pack corresponding to the negative contactor to control the negative contactor to close. Step S9-6, measure whether the voltage between terminals A and B of any high-voltage component is the high-voltage battery voltage; if so, it can be judged that the contacts of the positive and negative contactors are closed normally, if the voltage is close to 0V, it can be judged that the contacts of the positive and negative contactors are not closed normally or there is a corresponding fuse fault inside the high-voltage contactor, and it is necessary to replace the high-voltage contactor assembly or the high-voltage contactor and fuse.

4. The method for inspecting a high-voltage contactor of a hybrid electric vehicle without disassembly according to claim 1, characterized in that, The said Step S9 also includes the following steps: Step S9-7, use a fuse-equipped jumper wire to supply power to the pin on the electric vehicle battery pack corresponding to the pre-charge contactor to control the pre-charge contactor to close; Step S9-8, use another fuse-equipped jumper wire to supply power to the pin on the electric vehicle battery pack corresponding to the negative contactor to control the negative contactor to close. Step S9-8, measure whether the voltage between terminals A and B of any high-voltage component is much lower than the high-voltage battery voltage but much higher than 12V; if so, judge that the contacts of the pre-charge contactor and the negative contactor are closed normally, if the voltage is close to 0V, judge that the contacts of the pre-charge contactor and the negative contactor are not closed normally or there is a corresponding fuse fault inside the high-voltage contactor, and it is necessary to replace the high-voltage contactor assembly or the high-voltage contactor and fuse.

5. The method for inspecting a high-voltage contactor of a hybrid electric vehicle without disassembly according to claim 4, wherein: The power supply voltage connected by the fuse-equipped jumper wire is 12V.

6. The method for inspecting a high-voltage contactor of a hybrid electric vehicle without disassembly according to claim 1, characterized in that: The personal safety protection equipment includes insulating gloves. The insulating gloves include a glove body (1) and a replaceable working part (2). Both the glove body (1) and the replaceable working part (2) are insulated. The glove body (1) includes a five-finger part (11), a palm part (12) integrally connected to the five-finger part (11), and a sleeve part (13) integrally connected to the palm part (12). The replaceable working part (2) is detachably arranged on the side of the palm part (12) and the five-finger part (11) close to the palm. The replaceable working part (2) includes a replaceable palm (21) adapted to the palm part (12) and a replaceable finger part (22) integrally connected to the palm part (12). An upper window (23) for the five-finger part (11) and the palm part (12) to extend into is provided on the upper side of the replaceable palm (21) and the replaceable finger part (22). A sleeve cavity for socketing and matching with the ends of the five-finger part (11) is provided at the end of the replaceable finger part (22). A plurality of mutually cooperating magic tape female stickers (3) and magic tape male stickers (4) are respectively provided on the palm part (12) and the replaceable palm (21).

7. A method for inspecting a high-voltage contactor of a hybrid electric vehicle without disassembly, as described in claim 6, characterized in that: A plurality of anti-cutting wires arranged vertically and horizontally are laid in the replaceable working part (2), and the anti-cutting wires are insulated.

8. The method for inspecting a high-voltage contactor of a hybrid electric vehicle without disassembly according to claim 6, characterized in that: An electric shock prevention indication mechanism is further provided on the glove body (1) and the replaceable working part (2). The electric shock prevention indication mechanism includes an alarm (5) fixedly arranged on the sleeve part (13), a first insulating cable (6) laid on the outer wall of the sleeve part (13) and electrically connected to the alarm (5), a contact point (7) arranged on the outer wall of the replaceable finger part (22), a second insulating cable (8) laid on the outer wall of the replaceable working part (2) and electrically connected to the contact point (7). The second insulating cable (8) is detachably electrically connected to the first insulating cable (6). A protection circuit is provided in the alarm (5), and the first insulating cable (6) is electrically connected to the alarm (5) through the protection circuit.

9. The method for inspecting a high-voltage contactor of a hybrid electric vehicle without disassembly according to claim 8, characterized in that: A first connector (81) electrically connected to the second insulating cable (8) is provided on the second insulating cable (8), and a second connector (91) detachably connected to the first connector (81) is provided on the first insulating cable (6).

10. A method for inspecting a high-voltage contactor of a hybrid electric vehicle without disassembly, as described in claim 8, characterized in that: The alarm (5) is any one or a combination of a vibration alarm, a buzzer alarm, and a light alarm.

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