A common DC bus new energy power battery detection device and working method thereof

Abstract

The purpose of the present invention is to provide a common DC bus new energy power battery detection device and a working method thereof, which is characterized by: comprising a chassis, a charging and discharging machine, a communication module, a charging and discharging interface, a charging gun, a charging and discharging wiring harness, a lower computer module, a lower computer interface, a lower computer wiring harness, a balancing instrument, a balancing instrument interface and a balancing instrument wiring harness; the whole set of equipment is simple to operate, and can perform three-electric detection on the vehicle without disassembling the vehicle battery pack, obtain vehicle information at the first time, and provide a customized maintenance plan, and utilize the bidirectional characteristics of power facilities to meet the unidirectional and bidirectional requirements of the load, with high-precision energy feedback, and processed by a common DC bus DC power supply to meet the user's power battery PACK, module and various DC loads. The electric energy can be transmitted to the load, and the load electric energy can also be directly fed back to the power grid, reducing the energy loss caused by discharge, and cooperating with the balancing instrument to achieve overall voltage consistency and improve battery life.

Description

Technical Field

[0001] The present invention relates to the field of new energy power battery detection, and in particular to a common DC bus new energy power battery detection device and a working method thereof. Background Art

[0002] Compared with the increasingly large new energy vehicle market, the construction of the new energy vehicle after-sales market is obviously lagging behind. Most of the existing automobile after-sales systems are still based on the regular maintenance of traditional fuel vehicles. Traditional fuel vehicles have complex mechanical structures such as engines and gearboxes, and after-sales maintenance mainly focuses on regular replacement of air filters, engine lubricants and gearbox lubricants. In contrast, the mechanical parts of new energy vehicles are only electric motors and reducers, and the mechanical structure is greatly simplified, which greatly reduces the maintenance requirements of the mechanical structure. However, the degree of electrification of new energy vehicles has been greatly improved, and the detection and maintenance requirements of power battery systems and electromechanical control systems have been greatly increased, which is exactly what the current after-sales service system lacks. This has also led to poor after-sales service experience for new energy vehicles. Frequent complaints are usually because users have no choice but to pay high fees for maintenance locations, and the maintenance equipment operated by after-sales service personnel has single functions and complex operations. In order to adapt to the economy Due to energy demand, some institutions or factories that detect and repair new energy vehicles have gradually appeared on the market. The equipment they use is nothing more than battery testers, vehicle diagnostic instruments, equalizers and other equipment. The above equipment is extremely single in function and too complicated to operate. The learning cost of maintenance personnel is too high, and when testing the batteries of new energy vehicles, the battery pack of the entire vehicle needs to be disassembled, which is cumbersome to operate. The existing vehicle testing instruments and equipment can only detect problems on a certain brand or model of vehicle and only support detection, and cannot perform maintenance functions. Moreover, the equalizers currently used are all discharge balancing modes. By discharging battery packs of different voltages, they have reached the same voltage as the low-voltage battery pack and can be balanced. In the energy consumption link of the entire city power grid, the green energy-saving effect has not been achieved. In summary, it is necessary to develop a more functional power battery testing equipment to solve and avoid the problems and disadvantages encountered during the above-mentioned use. Summary of the invention

[0003] The purpose of the present invention is to provide a device for the detection of new energy power batteries, which can perform three-electric detection on the vehicle without disassembling the vehicle battery pack, and perform real-time dynamic charging and discharging detection through the DC charging gun interface, so as to obtain accurate vehicle information in the first time and provide a customized maintenance plan. The bidirectional characteristics of power facilities can be used to send and receive electric energy to meet the unidirectional and bidirectional requirements of the load, and have high-precision energy feedback. Through the common DC bus DC power supply, more test functions can be performed to meet the user's power battery PACK, module and various DC loads. Electric energy can not only be transmitted to the load, but also the load electric energy can be directly fed back to the power grid. There is no resistance load power consumption during the feeding process, which reduces the energy loss caused by discharge. In conjunction with the balancing instrument, the single PACK package or battery cell can be charged and discharged to achieve overall voltage consistency and improve the battery life. The overall detection operation is simple, the functions are complete, and the structure is simple. The multifunctional new energy power battery detection device and its working method.

[0004] The technical solution of the present invention is: a common DC bus new energy power battery detection device, characterized in that: it includes a chassis, a charger and discharger, a communication module, a charge and discharge interface, a charging gun, a charge and discharge wiring harness, a lower computer module, a lower computer interface, a lower computer wiring harness, a balancing instrument, a balancing instrument interface and a balancing instrument wiring harness, the charger and discharger is located inside the chassis, the charger and discharger is fixedly connected to the chassis, the communication module is located inside the chassis, the communication module is connected to the charger and discharger, the charge and discharge interface, the lower computer interface, and the balancing instrument interface are all located on the same side of the chassis, the charge and discharge interface, the lower computer interface, and the balancing instrument interface are all fixedly connected to the chassis, and the charge and discharge interface utilizes a line and is connected to the charger and discharger, the lower computer interface utilizes a line and is connected to the lower computer module, and the balancing instrument interface utilizes a line and connected to a balancing instrument, the charging gun is located on one side outside the chassis, the charging gun and the chassis are movably connected, a cc1 port is also provided on the charging gun, the cc1 port is located on one side of the charging gun, the cc1 port and the charging gun are fixedly connected, the charging and discharging harness is located between the charging and discharging interface and the charging gun, one end of the charging and discharging harness is connected to the charging and discharging interface, and the other end of the charging and discharging harness is connected to the cc1 port on the charging gun, the lower computer module is located inside the chassis, the lower computer module is connected to the communication module, the lower computer harness is located outside the chassis, the lower computer harness is connected to the lower computer interface, the balancing instrument is located inside the chassis, the balancing instrument is connected to the charging and discharging machine, the balancing instrument harness is located outside the chassis, and the balancing instrument harness is connected to the balancing instrument interface.

[0005] Furthermore, the charging and discharging machine is a tower inverter.

[0006] Furthermore, the cc1 port is a charging and discharging communication port.

[0007] Furthermore, the lower computer module is a vehicle diagnostic tester.

[0008] Working method:

[0009] The whole set of equipment has three sets of exposed wiring harnesses. One set is the charging and discharging wiring harness, which is used to connect to the charging and discharging machine for charging and discharging operations; the second set is the lower computer wiring harness, which is used to troubleshoot and detect new energy power batteries; the third set is the equalizer wiring harness, which is used to quickly deal with the imbalance problem of the vehicle battery; the specific detection steps are as follows:

[0010] Step 1: Vehicle entry pre-processing: After the user's vehicle enters the site, the staff will first connect the charging gun and the lower computer harness to the battery of the vehicle to be tested at the same time;

[0011] Step 2: Charge and discharge operation: After the charging gun and the lower computer harness are connected, the staff turns on the entire test equipment, that is, starts the charging and discharging machine inside the chassis to dynamically process the vehicle's charge and discharge. The cc1 port on the charging gun is connected to the charge and discharge interface using the charge and discharge harness. The cc1 port can send and upload control instructions to monitor the charge and discharge status of the vehicle's battery to be tested.

[0012] Step 3, lower computer detection: While step 2 is in progress, the staff uses the lower computer module to determine the problem of the vehicle being tested. The lower computer module is installed just below the panel of the communication module of the charger and discharger, and can be accurate to the voltage of a single battery. A variety of new energy vehicle models are integrated in the lower computer module, which can obtain accurate vehicle information in the first place and provide customized maintenance plans. The equipment has added a single voltage detection function in the detection of the three-electric system and the battery pack detection plan, which can accurately locate the voltage problem of a single PACK or a single battery in the battery pack;

[0013] Step 4: Issue a test report: After testing the battery of the vehicle entering the site through the charging and discharging harness and the lower computer harness, determine the voltage problem of a single PACK or single battery in the battery pack, and list the test reports of the faults one by one for the staff and the car owner to read and review;

[0014] Step 5: Quick equalization: The staff uses the equalizer harness to connect to the battery of the vehicle to be tested, which can realize quick equalization of the battery imbalance problem. The power supply of the equalizer is divided into two modes. Mode 1: The equalizer is connected to the charging and discharging motor inside the chassis to power it. Mode 2: The equalizer uses an external auxiliary power supply to realize power supply, which is more efficient and can balance the charging and discharging of the single PACK package or battery cell, so as to achieve the consistency of the overall voltage, improve the battery life, and repair the battery problem of the vehicle;

[0015] Step 6. Negotiate on the report: After all tests are completed, the staff can make further repair operations or replacement suggestions for the other three-electric problems in the test report through consultation with the car owner.

[0016] The beneficial effects of the present invention are as follows: the multifunctional new energy power battery detection device is mainly used in the new energy power battery detection process. The detection operation of the whole set of equipment is simple, the functions are complete, and the structure is simple. The vehicle can be tested for three-electricity without disassembling the vehicle battery pack. Through the DC charging gun interface, real-time dynamic charging and discharging detection can be performed, and accurate vehicle information can be obtained in the first time, and a customized maintenance plan can be given. The bidirectional characteristics of power facilities can be used to send and receive electric energy to meet the unidirectional and bidirectional requirements of the load. It has high-precision energy feedback and is processed through a common DC bus DC power supply to perform more testing functions. It can meet the user's power battery PACK, module and various DC loads. Electric energy can not only be transmitted to the load, but also the load electric energy can be directly fed back to the power grid. There is no resistance load power consumption during the feeding process, which reduces the energy loss caused by discharge. In conjunction with the balancing instrument, the single PACK package or battery cell can be charged and discharged balanced to achieve overall voltage consistency and improve battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the front view of the present invention.

[0018] Figure 2 It is a schematic diagram of the front structure inside the cabinet of the present invention.

[0019] Figure 3 It is a schematic diagram of the internal back structure of the cabinet of the present invention.

[0020] Figure 4 This is a principle flow chart of the common DC bus circuit of the present invention.

[0021] Figure 5 It is a flow chart for comparing the energy circulation channel topology of the present invention.

[0022] Figure 6This is a flow chart of the power battery performance test of the present invention.

[0023] Including: 1. Chassis 2. Charger and Discharger 3. Communication Module

[0024] 4. Charging and discharging interface 5. Charging gun 6. CC1 port

[0025] 7. Charging and discharging harness 8. Lower computer module 9. Lower computer interface

[0026] 10. Lower computer harness 11. Equalizer 12. Equalizer interface

[0027] 13. Equalizer wiring harness DETAILED DESCRIPTION

[0028] The specific implementation of the present invention is briefly described below in conjunction with the accompanying drawings.

[0029] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6The present invention discloses a common DC bus new energy power battery detection device, characterized in that it includes a chassis 1, a charging and discharging machine 2, a communication module 3, a charging and discharging interface 4, a charging gun 5, a charging and discharging harness 7, a lower computer module 8, a lower computer interface 9, a lower computer harness 10, a balancing instrument 11, a balancing instrument interface 12 and a balancing instrument harness 13. The charging and discharging machine 2 is located inside the chassis 1, and the charging and discharging machine 2 is fixedly connected to the chassis 1. The communication module 3 is located inside the chassis 1, and the communication module 3 is connected to the charging and discharging machine 2. The charging and discharging interface 4, the lower computer interface 9, and the balancing instrument interface 12 are all located on the same side of the chassis 1. The charging and discharging interface 4, the lower computer interface 9, and the balancing instrument interface 12 are all fixedly connected to the chassis 1, and the charging and discharging interface 4 is connected to the charging and discharging machine 2 by using a line, and the lower computer interface 9 is connected to the lower computer module 8 by using a line, and the balancing instrument interface 12 is connected to the balancing instrument by using a line. The charging gun 5 is located at one side outside the chassis 1, and the charging gun 5 is movably connected to the chassis 1. The charging gun 5 is also provided with a cc1 port 6, and the cc1 port 6 is located at one side of the charging gun 5. The cc1 port 6 is fixedly connected to the charging gun 5. The charging and discharging harness 7 is located between the charging and discharging interface 4 and the charging gun 5. One end of the charging and discharging harness 7 is connected to the charging and discharging interface 4, and the other end of the charging and discharging harness 7 is connected to the cc1 port 6 on the charging gun 5. The lower machine module 8 is located inside the chassis 1, and the lower machine module 8 is connected to the communication module 3. The lower machine harness 10 is located outside the chassis 1, and the lower machine harness 10 is connected to the lower machine interface 9. The balancing instrument 11 is located inside the chassis 1, and the balancing instrument 11 is connected to the charging and discharging machine 2. The balancing instrument harness 13 is located outside the chassis 1, and the balancing instrument harness 13 is connected to the balancing instrument interface 12. The charging and discharging machine 2 is a tower inverter. The cc1 port 6 is a charge and discharge communication port. The lower computer module 8 is a vehicle diagnostic tester.

[0030] Working mode: This multifunctional new energy power battery detection device is mainly used in the new energy power battery detection process. The whole set of equipment mainly includes chassis 1, charging and discharging machine 2, communication module 3, charging and discharging interface 4, charging gun 5, charging and discharging harness 7, lower computer module 8, lower computer interface 9, lower computer harness 10, balancing instrument 11, balancing instrument interface 12 and balancing instrument harness 13. Among them, the charging and discharging machine 2, communication module 3, lower computer module 8 and balancing instrument 11 are all installed inside the chassis 1. The chassis 1 protects the components and instruments, while the charging and discharging machine 2 adopts a tower inverter. , mainly used for battery charging and discharging of the vehicle to be tested. In addition, the charging and discharging interface 4, the lower computer interface 9, and the equalizer interface 12 are all located on the same side of the chassis 1, which are used to detect the connection of the wiring harness; the whole set of equipment has three sets of wiring harnesses exposed, one set is the charging and discharging wiring harness 7, which is used to connect to the charging and discharging machine 2, and the overall charging and discharging wiring harness 7 is integrated into the charging gun 5, which is used to perform charging and discharging operations; the second set is the lower computer wiring harness 10, which is used to troubleshoot and detect new energy power batteries; the third set is the equalizer wiring harness 13, which is used to quickly deal with the imbalance problem of the vehicle battery; the specific detection steps are as follows:

[0031] Step 1: Vehicle entry pre-processing: After the user's vehicle enters the site, the staff first connects the charging gun 5 and the lower computer harness 10 to the battery of the vehicle to be tested at the same time.

[0032] Step 2, charging and discharging operation: After the charging gun 5 and the lower computer harness 10 are connected, the staff turns on the entire detection equipment, that is, starts the charging and discharging machine 2 inside the chassis 1, and performs dynamic charging and discharging processing on the vehicle. The charging gun 5 is also equipped with a cc1 port 6. The cc1 port 6 adopts a charging and discharging communication port. It is connected to the charging and discharging interface 4 using the charging and discharging harness 7. The cc1 port 6 can send and upload control instructions to monitor the charging and discharging status of the battery of the vehicle to be tested.

[0033] Step 3, lower computer detection: While step 2 is in progress, the staff uses the lower computer module 8 to determine the problem of the vehicle being tested. The lower computer module 8 uses a vehicle diagnostic tester, which is installed just below the panel of the communication module 3 of the charger and discharger 2. It can be accurate to the voltage of a single cell. A variety of new energy vehicle models are integrated in the lower computer module 8, and accurate vehicle information can be obtained at the first time, and a customized maintenance plan can be given. The equipment has added a single cell voltage detection function in the detection of the three-electric system and the battery pack detection plan, which can accurately locate the voltage problem of a single PACK or single cell in the battery pack.

[0034] Step 4: Issue a test report: After the battery of the incoming vehicle is tested through the charging and discharging harness 7 and the lower computer harness 10, the voltage problem of a single PACK or a single cell in the battery pack is determined, and a test report of the fault problem is listed one by one for the staff and the owner to read and review.

[0035] Step 5, fast equalization processing: the staff uses the equalizer harness 13 to connect to the battery of the vehicle to be tested, which can realize fast equalization processing of the battery imbalance problem. The power supply of the equalizer 11 is divided into two modes. Mode 1: the equalizer 11 is connected to the charger and discharger 2 inside the chassis 1 to power it. Mode 2: the equalizer 11 uses an external auxiliary power supply to realize power supply. The external auxiliary power supply is a power supply module that provides a stable low voltage to the basic control circuit. It can also be understood as the basic operation power supply equipment of the equipment's startup control. The equipment with an auxiliary power supply is usually powered by the auxiliary power supply to the control circuit, and then the control circuit controls the main power supply to work. The auxiliary power supply generally does not exceed 24v. The power supply of the equalizer 11 in the device can be directly powered by the auxiliary power supply, which is simpler and more efficient. It can charge and discharge the single PACK package or battery cell to balance the overall voltage, thereby achieving overall voltage consistency, improving battery life, and repairing problems with the vehicle's battery.

[0036] Step 6. Negotiate on the report: After all tests are completed, the staff can make further repair operations or replacement suggestions for the other three-electric problems in the test report through consultation with the car owner.

[0037] During operation, the whole set of equipment adopts a combination of bidirectional AC-DC and bidirectional DC-DC and realizes energy feeding or internal circulation between channels through a shared internal DC bus. Based on the 32-bit floating-point DSP+ARM communication control platform, it realizes various complex charging and discharging process control and management for users. The whole system adopts Infineon IGBT margin timely power control. The modular power unit configuration of the whole system ensures excellent electromagnetic compatibility characteristics and can meet the reliable use in various occasions. CAN, RS-485, Ethernet and other communication methods are available for users to choose, and real-time data docking with protection boards, BMS, etc. is possible.

[0038] Its battery testing functions include: 1. Battery pack cycle life test, channel cycle test; 2. Battery pack capacity test; 3. Battery pack charge / discharge characteristic test; 4. Battery pack charge retention ability test; 5. Battery pack charge / discharge efficiency test; 6. Battery pack overcharge and overdischarge rate tolerance test; 7. Battery pack temperature characteristic test; 8. Battery pack standard dynamic test; 9. Battery pack temperature test; 10. Battery pack dynamic internal resistance test; 11. Battery pack pulse charge and discharge test; 12. The remote test control platform is fully functional and supports various working condition tests on battery packs. , supports multi-channel parallel operation; 13. It can receive the detection and control data uploaded by the charging and discharging components, single battery voltage detection module, and temperature detection module, and save and analyze the data; 14. It can intuitively display and record various real-time data, operating conditions, fault information, etc. of multiple charging / discharging test equipment, and has powerful data query, analysis, and management functions; 15. Users can define the process control points of each stage, such as current, voltage, power, ampere-hour, temperature and time, etc.; 16. Strictly send control parameters to the charging and discharging components according to the process flow compiled by the user.

[0039] The energy management advantages of the whole set of equipment are as follows: First, it has the technology accumulation of pure digital bidirectional converter, which is stable and reliable; second, through the energy management strategy, the 6-level loss of energy flowing through the channel is reduced to 2 levels, reducing 4-level energy loss; third, the patented core power control unit of wireless connection, namely IGBT+absorption capacitor+busbar+support capacitor, ensures the stability of the system and minimizes electromagnetic interference; fourth, multi-channel free matching and flexible configuration of charging and discharging power can realize battery charging and discharging test almost without drawing power from the power grid; fifth, multi-channel test battery pack charging and discharging test is realized at the bottom layer of energy consumption link; sixth, the host computer displays the real-time power of multi-channel charging and discharging in real time, which is convenient for users to adjust the test method and optimize the energy management strategy.

[0040] The common DC bus setting parameters are divided into two types: AC-DC parameters and DC-DC parameters:

[0041] 1. The technical parameters of the AC-DC AC side of the common DC bus are: rated voltage: 380V±10%; frequency: 50Hz±2Hz; power factor ≥0.99; current harmonics, referred to as THD<5%, at which time the current harmonics are under full load; AC input: three-phase five-wire, that is, grounding resistance ≤5Ω; AC protection: undervoltage, overvoltage, overcurrent, phase loss, overload, abnormal frequency, overtemperature, communication timeout, and anti-islanding effect.

[0042] 2. Technical parameters of the DC-DC DC side of the common DC bus are as follows: Number of DC channels per cabinet: 4; Rated power of a single channel: 40kW; Total power of DC channels: 160kW; Charge and discharge voltage range: 0V-400V for charging, 20V~400V for discharging; Energy feedback efficiency ≥90%; Inter-channel circulation efficiency ≥97%; Output voltage sampling resolution: 1mV; Rated current of a single channel: ±100A; Parallel current: ±400A; Voltage accuracy ≤±0.1%FS; Current accuracy ≤±0 .1% FS; output current sampling resolution: 1mA; continuous sampling speed ≤10ms; current rise / fall time ≤30ms (10%Imax to 90%Imax), no impact; charge / discharge switching time ≤60ms (-100%Imax to 100%Imax), no impact; power resolution: 0.1kW; DC channel protection mode: load side power failure, overvoltage, overcurrent, short circuit, reverse connection (including RVS line reverse connection), phase loss, overtemperature, communication timeout and other multiple protection functions.

[0043] The battery data is collected through the charging and discharging machine 2 inside the chassis 1. The charging and discharging machine 2 adopts a tower inverter, which is completed in cooperation with the communication module 3 and the lower computer module 8. It has the following characteristics: 1. High precision: the voltage measurement accuracy is less than 1mV, the temperature measurement accuracy is less than 1℃, and the resistance simulation has a resolution of 1 ohm; 2. Fast response: 50ms to update a channel, CAN communication 500kps; 3. The resistance board can be easily imported into the graduation table to adapt to the measurement and simulation of different NTCs; 4. Easy maintenance: modular design, high integration, simple maintenance, stable and reliable; 5. Both power supply and communication adopt dual-port design, which is easy to cascade and convenient for multi-fast board expansion; 6. RS-485C and CAN communication methods, open protocols, are conducive to user integration.

[0044] The application scenarios of the whole set of equipment are divided into four contents: 1. Cell voltage and temperature acquisition, recording and analysis; 2. Battery pack test system integration; 3. Temperature simulation, used for BMS temperature detection function test; 4. Other high-precision voltage, temperature measurement and recording occasions; Among them, in high-precision voltage measurement, the voltage acquisition board provides 32CH voltage acquisition with an accuracy of less than 5mV, which ensures the accuracy of internal resistance calculation when the battery internal resistance needs to be calculated; In temperature measurement, the temperature measurement board provides 32CH temperature acquisition, referred to as NTC, with an accuracy of less than 1°C; In temperature simulation, the temperature simulation board can set the resistance and output the resistance value as required to simulate the NTC output, with a resolution of 1 ohm, ranging from 1 ohm to 100M ohm, and 6-way output. Users can choose between resistance setting and temperature setting; In the process of importing the NTC table into the temperature board, the temperature acquisition board and the temperature simulation board provide the NTC graduation table import function to adapt to different NTC types, which greatly facilitates user use.

[0045] The whole set of equipment is simple to operate, fully functional and simple in structure. It can perform three-electric detection on the vehicle without disassembling the vehicle battery pack. Through the DC charging gun interface, it can perform real-time dynamic charging and discharging detection, obtain accurate vehicle information in the first time, and give customized maintenance plans. It uses the bidirectional characteristics of power facilities to send and receive electric energy to meet the unidirectional and bidirectional needs of the load. It has high-precision energy feedback and is processed through a common DC bus DC power supply to perform more testing functions. It can meet users' power battery PACK, modules and various DC loads. Electric energy can not only be transmitted to the load, but also the load electric energy can be directly fed back to the power grid. There is no resistance load power consumption during the feeding process, which reduces the energy loss caused by discharge. In conjunction with the balancing instrument, it can charge and discharge the single PACK package or battery cell to achieve overall voltage consistency and improve battery life.

[0046] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "inner", "outer", "top", "bottom", "end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0047] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A new energy power battery detection device with a common DC bus. Features: It includes a chassis, a charging and discharging machine, a communication module, a charging and discharging interface, a charging gun, a charging and discharging wiring harness, a lower computer module, a lower computer interface, a lower computer wiring harness, a balancing instrument, a balancing instrument interface and a balancing instrument wiring harness, wherein the charging and discharging machine is located inside the chassis, and the charging and discharging machine is fixedly connected to the chassis, the communication module is located inside the chassis, and the communication module is connected to the charging and discharging machine, the charging and discharging interface, the lower computer interface, and the balancing instrument interface are all located on the same side of the chassis, the charging and discharging interface, the lower computer interface, and the balancing instrument interface are all fixedly connected to the chassis, and the charging and discharging interface utilizes a line and is connected to the charging and discharging machine, the lower computer interface utilizes a line and is connected to the lower computer module, the balancing instrument interface utilizes a line and is connected to the balancing instrument, and the charging gun is located inside the chassis On one side of the outside of the box, the charging gun is movably connected to the chassis, and a cc1 port is also provided on the charging gun, and the cc1 port is located on one side of the charging gun, and the cc1 port is fixedly connected to the charging gun, the charging and discharging harness is located between the charging and discharging interface and the charging gun, one end of the charging and discharging harness is connected to the charging and discharging interface, and the other end of the charging and discharging harness is connected to the cc1 port on the charging gun, the lower computer module is located inside the chassis, the lower computer module is connected to the communication module, the lower computer harness is located outside the chassis, the lower computer harness is connected to the lower computer interface, the balancing instrument is located inside the chassis, the balancing instrument is connected to the charging and discharging machine, the balancing instrument harness is located outside the chassis, and the balancing instrument harness is connected to the balancing instrument interface.

2. According to claim 1, a common DC bus new energy power battery detection device, Features: The charging and discharging machine is a tower inverter.

3. According to claim 1, a common DC bus new energy power battery detection device, Features: The cc1 port is a charging and discharging communication port.

4. According to claim 1, a common DC bus new energy power battery detection device, Features: The lower computer module is a vehicle diagnostic tester.

5. A working method of a common DC bus new energy power battery detection device according to any one of claims 1 to 4: The whole set of equipment has three sets of exposed wiring harnesses. One set is the charging and discharging wiring harness, which is used to connect to the charging and discharging machine for charging and discharging operations; the second set is the lower computer wiring harness, which is used to troubleshoot and detect new energy power batteries; the third set is the equalizer wiring harness, which is used to quickly deal with the imbalance problem of the vehicle battery; the specific detection steps are as follows: Step 1: Vehicle entry pre-processing: After the user's vehicle enters the site, the staff will first connect the charging gun and the lower computer harness to the battery of the vehicle to be tested at the same time; Step 2: Charge and discharge operation: After the charging gun and the lower computer harness are connected, the staff turns on the entire test equipment, that is, starts the charging and discharging machine inside the chassis to dynamically process the vehicle's charge and discharge. The cc1 port on the charging gun is connected to the charge and discharge interface using the charge and discharge harness. The cc1 port can send and upload control instructions to monitor the charge and discharge status of the vehicle's battery to be tested. Step 3, lower computer detection: While step 2 is in progress, the staff uses the lower computer module to determine the problem of the vehicle being tested. The lower computer module is installed just below the panel of the communication module of the charger and discharger, and can be accurate to the voltage of a single battery. A variety of new energy vehicle models are integrated in the lower computer module, which can obtain accurate vehicle information in the first place and provide customized maintenance plans. The equipment has added a single voltage detection function in the detection of the three-electric system and the battery pack detection plan, which can accurately locate the voltage problem of a single PACK or a single battery in the battery pack; Step 4: Issue a test report: After testing the battery of the vehicle entering the site through the charging and discharging harness and the lower computer harness, determine the voltage problem of a single PACK or single battery in the battery pack, and list the test reports of the faults one by one for the staff and the car owner to read and review; Step 5: Quick equalization: The staff uses the equalizer harness to connect to the battery of the vehicle to be tested, which can realize quick equalization of the battery imbalance problem. The power supply of the equalizer is divided into two modes. Mode 1: The equalizer is connected to the charging and discharging motor inside the chassis to power it. Mode 2: The equalizer uses an external auxiliary power supply to realize power supply, which is more efficient and can balance the charging and discharging of the single PACK package or battery cell, so as to achieve the consistency of the overall voltage, improve the battery life, and repair the battery problem of the vehicle; Step 6. Negotiate on the report: After all tests are completed, the staff can make further repair operations or replacement suggestions for the other three-electric problems in the test report through consultation with the car owner.

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