New energy automobile power battery capacity detection device

Abstract

The utility model discloses a new energy automobile power battery capacity detection device. The rapid charging device comprises a shell, an auxiliary power supply, a charging port, a switch, a data display screen, a current acquisition board, a shunt, a rapid charging national standard protocol board, a rapid charging female head seat and a rapid charging male head seat. When a new energy automobile is maintained and detected, an external charging pile gun head is inserted into the rapid charging female head seat, and the rapid charging male head seat is inserted into the rapid charging port of the detected new energy automobile; the total capacity of the power battery pack is obtained, or the actual charging efficiency of an external charging pile is detected; the current battery state and performance of the new energy automobile can be more intuitively known from the perspective of users; when a maintainer uses the equipment for maintenance and diagnosis, the data result is more accurate, and the detection is faster, so that the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power battery detection for new energy vehicles, and particularly relates to a device for detecting the capacity of a power battery for new energy vehicles. Background Technique

[0002] At present, the most widely used battery technology in new energy vehicles is lithium-ion batteries. Lithium-ion batteries have high energy density, long cycle life and good safety performance, and have been widely recognized by the market. However, lithium-ion batteries still have some bottlenecks, such as long charging time, limited cruising range and adaptability to high and low temperature environments.

[0003] According to the latest data, in April 2024, the installed capacity of power batteries in China reached 35.4 GWh, a year-on-year increase of 40.9%. The production and sales volume of new energy vehicles reached 870,000 and 850,000 respectively, and the market share was 36%. This indicates that the demand for the new energy vehicle battery market is growing rapidly.

[0004] Over time and with the increase in the number of uses, the life of new energy power batteries will gradually decrease, and the capacity will also decay. This is mainly due to factors such as chemical reactions inside the battery and material aging. Taking lithium-ion batteries as an example, their life is usually between 5 and 8 years, but the actual life in use will be affected by various factors, such as charging methods and operating temperatures. Reference data shows that after long-term use, the capacity of the power battery of new energy vehicles may be reduced to 70% or even lower of the original capacity. This means that the cruising range of the vehicle will be correspondingly reduced, and users need to charge more frequently.

[0005] When the life of the new energy power battery expires or is damaged, users need to replace the new battery. However, the replacement cost of the power battery is usually relatively high, which may be a large expense for ordinary consumers. According to market research, the cost of replacing a set of new energy power batteries may be as high as tens of thousands of yuan.

[0006] In extreme cases, the power battery of new energy vehicles may cause safety accidents such as spontaneous combustion or explosion. Although the incidence of such accidents is relatively low, it still attracts public attention to the safety of new energy vehicles.

[0007] The attenuation of the power battery capacity is an inevitable phenomenon in the use of new energy vehicles, and its hazards are mainly reflected in the following aspects:

[0008] 1. Reduced cruising range: The power battery is the "heart" of a new energy vehicle, providing power for the vehicle. When the battery capacity decays, the most direct impact is the reduction of the vehicle's cruising range, which means that the distance the vehicle can travel after a single charge becomes shorter, increasing the user's usage cost and inconvenience;

[0009] 2. Performance degradation: In addition to the reduction in driving range, the attenuation of battery capacity may also lead to a decline in the vehicle's power performance. Due to the weakened power supply ability of the battery, the vehicle's acceleration, climbing and other performances may be affected, reducing the driving experience.

[0010] 3. Extended charging time: When the battery capacity decays, the internal resistance of the battery may increase, resulting in a decrease in charging efficiency. This means that users need to spend more time charging the vehicle, increasing the usage cost and time cost.

[0011] 4. Safety hazards: The attenuation of battery capacity may also cause changes in the internal structure of the battery, increasing safety hazards such as battery thermal runaway and short circuits. These safety hazards may not only damage the vehicle but also pose a threat to the user's life safety. 5. Reduced used car value: For the used car market, the attenuation of the power battery capacity is also an important evaluation index. Vehicles with severe capacity attenuation will have a corresponding reduction in their used car value, affecting the asset value of the vehicle owner.

[0012] 6. Increased maintenance cost: When the battery capacity decays to a certain extent, it may be necessary to replace the battery or take other maintenance measures, which will increase the vehicle owner's maintenance cost and may bring additional financial burdens.

[0013] During routine capacity detection, it is generally necessary to read the data stream of the vehicle battery management system (BMS) or obtain the information of the vehicle's on-board networking system (TBOX) and inform the vehicle owner of the result. The maintenance personnel perform maintenance on the power battery based on this information. Most vehicle owners do not recognize this method of obtaining capacity data because the capacity detection data depends on the self-defined means of the vehicle manufacturer. Summary of the Invention

[0014] In view of the above problems existing in the diagnosis and maintenance process of traditional new energy vehicles, the utility model proposes a device for detecting the capacity of a new energy vehicle power battery, which improves the intuitiveness of the maintenance personnel in detecting the power battery capacity from the aspect of the maintenance personnel's operation. Secondly, when maintaining a new energy vehicle, the measured data is more accurate and the maintenance is faster; it enables the vehicle owner to more intuitively view the actual remaining capacity value of the power battery.

[0015] The power battery capacity detection device for new energy vehicles of the present utility model comprises: a housing, an auxiliary power supply, a charging port, a switch, a data display screen, a current acquisition board, a shunt, a fast charging national standard protocol board, a fast charging female head seat and a fast charging male head seat; wherein, the auxiliary power supply, the fast charging national standard protocol board, the current collector and the shunt are respectively arranged inside the housing; the charging port, the switch and the data display screen are respectively arranged on the surface of the housing; the fast charging female head seat and the fast charging male head seat are respectively arranged on both sides of the housing; the charging port is connected to the auxiliary power supply through a wire; the positive terminal of the auxiliary power supply is respectively connected to the data display screen, the current acquisition board, the fast charging national standard protocol board, the fast charging female head seat and the fast charging male head seat through a wire; the negative terminal of the auxiliary power supply is connected to one end of the switch through a wire; the other end of the switch is respectively connected to the data display screen, the current acquisition board, the fast charging national standard protocol board, the fast charging female head seat and the fast charging male head seat through a wire; the low-voltage terminal and the communication terminal of the data display screen are respectively connected to the low-voltage terminal and the communication terminal of the fast charging male head seat and the low-voltage terminal and the communication output terminal of the fast charging national standard protocol board through a wire; the signal terminal of the data display screen is connected to the signal terminal of the current acquisition board through a wire; the high-voltage positive terminal of the current acquisition board is connected to the high-voltage positive terminal of the fast charging male head seat through a wire; the current terminal of the current acquisition board is connected to the current terminal of the shunt through a wire; the communication terminal of the fast charging female head seat is connected to the communication input terminal of the fast charging national standard protocol board through a wire; the communication output terminal of the fast charging national standard protocol board is connected to the communication terminal of the fast charging male head seat through a wire; the ports of the fast charging female head seat other than the communication terminal are respectively connected to the corresponding ports of the fast charging male head seat through a wire.

[0016] The fast charging female socket uses a national standard 9-pin fast charging female socket, including nine ports: low-voltage positive terminal A+, low-voltage negative terminal A-, high-position communication line terminal S+, low-position communication line terminal S-, first connection confirmation line terminal CC1, second connection confirmation line terminal CC2, ground wire terminal PE, high-voltage positive terminal DC+, and high-voltage negative terminal DC-. The low-voltage positive terminal A+ and the low-voltage negative terminal A- are collectively referred to as the low-voltage terminals, and the high-position communication line terminal S+ and the low-position communication line terminal S- are collectively referred to as the communication terminals. Correspondingly, the fast charging male socket uses a national standard 9-pin fast charging male socket, and the nine ports are the same as those of the national standard 9-pin fast charging female socket. The fast charging national standard protocol board includes a high-position communication line input terminal S+i, a low-position communication line input terminal S-i, a high-position communication line output terminal S+o, a low-position communication line output terminal S-o, a low-voltage positive terminal A+, and a low-voltage negative terminal A-. The high-position communication line input terminal S+i and the low-position communication line input terminal S-i are collectively referred to as the communication input terminals, and the high-position communication line output terminal S+o and the low-position communication line output terminal S-o are collectively referred to as the communication output terminals. The data display screen includes a low-voltage positive terminal A+, a low-voltage negative terminal A-, a high-position communication line terminal S+, a low-position communication line terminal S-, a first signal terminal A, and a second signal terminal B. The first signal terminal A and the second signal terminal B are collectively referred to as the signal terminals. The current acquisition board includes a high-voltage positive terminal DC+, a first signal terminal A, a second signal terminal B, a low-voltage positive terminal A+, a low-voltage negative terminal A-, a current positive terminal, and a current negative terminal. The current positive terminal and the current negative terminal are collectively referred to as the current terminals.

[0017] The positive terminal of the auxiliary power supply is respectively connected to the low-voltage positive terminal A+ of the data display screen, the low-voltage positive terminal A+ of the current acquisition board, the low-voltage positive terminal A+ of the fast charging national standard protocol board, the low-voltage positive terminal A+ of the national standard 9-pin fast charging female head socket, and the low-voltage positive terminal A+ of the national standard 9-pin fast charging male head socket through wires; one end of the switch is connected to the negative terminal of the switch auxiliary power supply through a wire, and the other end of the switch is respectively connected to the low-voltage negative terminal A- of the data display screen, the low-voltage negative terminal A- of the current acquisition board, the low-voltage negative terminal A- of the fast charging national standard protocol board, the low-voltage negative terminal A- of the national standard 9-pin fast charging female head socket, and the low-voltage positive terminal A- of the national standard 9-pin fast charging male head socket through wires; the low-bit end S- of the communication line of the data display screen is respectively connected to the low-bit end S- of the communication line of the national standard 9-pin fast charging male head socket and the low-bit output end S-o of the communication line of the fast charging national standard protocol board through wires; the high-bit end S+ of the communication line of the data display screen is respectively connected to the high-bit end S+ of the communication line of the national standard 9-pin fast charging male head socket and the high-bit o output end S+o of the communication line of the fast charging national standard protocol board through wires; the high-voltage positive terminal DC+ of the current acquisition board is connected to the high-voltage positive terminal DC+ of the national standard 9-pin fast charging male head socket through a wire; the first signal terminal A of the current acquisition board is connected to the first signal terminal A of the data display screen through a wire; the second signal terminal B of the current acquisition board is connected to the second signal terminal B of the data display screen through a wire; the current positive terminal and the current negative terminal of the current acquisition board are respectively connected to the current positive terminal I+ and the current negative terminal I- of the shunt through wires; the high-bit communication line S+ of the national standard 9-pin fast charging female head socket is connected to the high-bit input end S+i of the communication line of the fast charging national standard protocol board through a wire; the low-bit communication line S- of the national standard 9-pin fast charging female head socket is connected to the low-bit input end S-i of the communication line of the fast charging national standard protocol board through a wire; the low-voltage positive terminal A+, the low-voltage negative terminal A-, the first connection confirmation line terminal CC1, the second connection confirmation line terminal CC2, the ground wire terminal PE, the high-voltage positive terminal DC+ and the high-voltage negative terminal DC- of the national standard 9-pin fast charging female head socket are respectively connected to the corresponding ports of the national standard 9-pin fast charging male head socket through wires.

[0018] The auxiliary power supply uses a lithium battery with a voltage of 12V; the auxiliary power supply provides power for the data display screen. During capacity detection, the auxiliary power supply does not work. The low-voltage positive terminal A+ and the low-voltage negative terminal A- of the fast charging female head socket obtain the 12V auxiliary power supply of the external charging pile to provide power for the fast charging protocol board, the data display screen, the current acquisition board and the fast charging male head socket, and reverse charge the auxiliary power supply; when the external charging pile is not connected, the switch is turned on, and the auxiliary power supply provides power for the fast charging protocol board, the data display screen and the fast charging male head socket of the current collector; the voltage is 12V. The external 12V charger charges the auxiliary power supply through the charging port.

[0019] When repairing and testing new energy vehicles, the external charging pile gun head is inserted into the fast charging female head seat, and the fast charging male head seat is inserted into the fast charging port of the new energy vehicle to be tested; the auxiliary power supply provides power at the initial stage of capacity detection. When the power of the auxiliary power supply is insufficient, the external 12V charger charges the auxiliary power supply through the charging port. After the fast charging female head seat is connected to the external charging pile, the auxiliary power supply stops working. The power supplies of the data display screen, current collector, fast charging national standard protocol board, and fast charging male head seat are provided by the external charging pile through the fast charging female head seat and reverse charge the auxiliary power supply; when the external charging pile starts to deliver high-voltage power, the fast charging national standard protocol board obtains the charging signal of the charging pile through the fast charging female head seat, modifies the current signal therein and makes it a constant current, and the modified current signal is sent to the data display screen and the fast charging male head seat respectively; during capacity detection, the negative terminal of the high-voltage power supply of the external charging pile flows through the shunt, the shunt collects the current value of the high-voltage power supply, the shunt sends the collected current value to the current collection board, the current collection board converts the current value into a current signal, the high-voltage positive terminal DC+ of the current collection board collects the voltage value of the high-voltage power supply and converts the voltage value into a voltage signal, the current collection board sends the current signal and the voltage signal to the data display screen, the data display screen converts the voltage signal and the current signal and calculates the charging energy (KWh) and capacity (Ah), and the data display screen displays the voltage, real-time current, real-time power, electricity, battery capacity and time; the capacity value of the new energy power battery is quickly detected by the fast charging method and the current health state of the power battery is judged.

[0020] Advantages of the present utility model:

[0021] When repairing and testing new energy vehicles with the present utility model, only one end of the equipment of the present utility model needs to be inserted into the fast charging port of the new energy vehicle and the other end is connected to the external charging pile; from the user's perspective, it is more intuitive to understand the current battery state and performance of the new energy vehicle; when maintenance personnel use this equipment for maintenance diagnosis, the data results are more accurate and the detection is faster, thus improving work efficiency. Description of the drawings

[0022] Figure 1 It is the front view of the appearance of an embodiment of the new energy vehicle power battery capacity detection device of the present utility model;

[0023] Figure 2 It is the left view of the appearance of an embodiment of the new energy vehicle power battery capacity detection device of the present utility model;

[0024] Figure 3 It is the right view of the appearance of an embodiment of the new energy vehicle power battery capacity detection device of the present utility model;

[0025] Figure 4It is a connection block diagram of an embodiment of the power battery capacity detection device for new energy vehicles of the present utility model. Detailed implementation mode

[0026] The present utility model will be further described below in conjunction with the accompanying drawings and through specific embodiments.

[0027] As Figures 1 to 3 shown, the power battery capacity detection device for new energy vehicles in this embodiment includes: a housing 1, an auxiliary power supply, a charging port 2, a switch 3, a data display screen 4, a current acquisition board, a shunt, a fast charging national standard protocol board, a national standard 9-hole fast charging female head seat 5, and a national standard 9-hole fast charging male head seat 6; among them, the auxiliary power supply, the fast charging national standard protocol board, the current collector, and the shunt are respectively arranged in the housing 1; the charging port 2, the switch 3, and the data display screen 4 are respectively arranged on the surface of the housing 1; the fast charging female head seat and the fast charging male head seat are respectively arranged on both sides of the housing 1; the charging port 2 is connected to the auxiliary power supply through a wire; the positive terminal of the auxiliary power supply is respectively connected to the data display screen 4, the current acquisition board, the fast charging national standard protocol board, the fast charging female head seat, and the fast charging male head seat through a wire; the negative terminal of the auxiliary power supply is connected to one end of the switch 3 through a wire; the other end of the switch 3 is respectively connected to the data display screen 4, the current acquisition board, the fast charging national standard protocol board, the fast charging female head seat, and the fast charging male head seat through a wire; the low-voltage end communication and end of the data display screen 4 are respectively connected to the low-voltage end and communication end of the fast charging male head seat and the low-voltage end and communication output end of the fast charging national standard protocol board through a wire; the signal end of the data display screen 4 is connected to the signal end of the current acquisition board through a wire; the high-voltage positive terminal of the current acquisition board is connected to the high-voltage positive terminal of the fast charging male head seat through a wire; the current end of the current acquisition board is connected to the current end of the shunt through a wire; the communication end of the fast charging female head seat is connected to the communication input end of the fast charging national standard protocol board through a wire; the communication output end of the fast charging national standard protocol board is connected to the communication end of the fast charging male head seat through a wire; other ports of the fast charging female head seat except the communication end are connected to the corresponding ports of the fast charging male head seat through a wire. A hatch cover for the switch 3 is provided at the bottom of the housing 1 to protect the national standard 9-hole fast charging female head seat 5.

[0028] The fast charging female connector uses a national standard 9-pin fast charging female connector 5, which includes nine ports: low-voltage positive terminal A+, low-voltage negative terminal A-, high-position communication line terminal S+, low-position communication line terminal S-, first connection confirmation line terminal CC1, second connection confirmation line terminal CC2, ground wire terminal PE, high-voltage positive terminal DC+ and high-voltage negative terminal DC-. The low-voltage positive terminal A+ and the low-voltage negative terminal A- are collectively referred to as the low-voltage terminals, and the high-position communication line terminal S+ and the low-position communication line terminal S- are collectively referred to as the communication terminals. Correspondingly, the fast charging male connector uses a national standard 9-pin fast charging male connector 6, and the nine ports are the same as those of the national standard 9-pin fast charging female connector 5. The fast charging national standard protocol board includes a high-position communication line input terminal S+i, a low-position communication line input terminal S-i, a high-position communication line output terminal S+o, a low-position communication line output terminal S-o, a low-voltage positive terminal A+ and a low-voltage negative terminal A-. The high-position communication line input terminal S+i and the low-position communication line input terminal S-i are collectively referred to as the communication input terminals, and the high-position communication line output terminal S+o and the low-position communication line output terminal S-o are collectively referred to as the communication output terminals. The data display screen 4 includes a low-voltage positive terminal A+, a low-voltage negative terminal A-, a high-position communication line terminal S+, a low-position communication line terminal S-, a first signal terminal A and a second signal terminal B. The first signal terminal A and the second signal terminal B are collectively referred to as the signal terminals. The current acquisition board includes a high-voltage positive terminal DC+, a first signal terminal A, a second signal terminal B, a low-voltage positive terminal A+ and a low-voltage negative terminal A-.

[0029] Such as Figure 4As shown in the figure, the positive terminal of the auxiliary power supply is respectively connected to the low-voltage positive terminal A+ of the data display screen 4, the low-voltage positive terminal A+ of the current acquisition board, the low-voltage positive terminal A+ of the fast-charging national standard protocol board, the low-voltage positive terminal A+ of the national standard 9-pin fast-charging female socket 5, and the low-voltage positive terminal A+ of the national standard 9-pin fast-charging male socket 6 through wires; one end of the switch 3 is connected to the negative terminal of the auxiliary power supply of the switch 3 through a wire, and the other end of the switch 3 is respectively connected to the low-voltage negative terminal A- of the data display screen 4, the low-voltage negative terminal A- of the current acquisition board, the low-voltage negative terminal A- of the fast-charging national standard protocol board, the low-voltage negative terminal A- of the national standard 9-pin fast-charging female socket 5, and the low-voltage positive terminal A- of the national standard 9-pin fast-charging male socket 6 through wires; the low-level end S- of the communication line of the data display screen 4 is respectively connected to the low-level end S- of the communication line of the national standard 9-pin fast-charging male socket 6 and the low-level output end S-o of the communication line of the fast-charging national standard protocol board through wires; the high-level end S+ of the communication line of the data display screen 4 is respectively connected to the high-level end S+ of the communication line of the national standard 9-pin fast-charging male socket 6 and the high-level o output end S+o of the communication line of the fast-charging national standard protocol board through wires; the high-voltage positive terminal DC+ of the current acquisition board is connected to the high-voltage positive terminal DC+ of the national standard 9-pin fast-charging male socket 6 through a wire; the first signal terminal A of the current acquisition board is connected to the first signal terminal A of the data display screen 4 through a wire; the second signal terminal B of the current acquisition board is connected to the second signal terminal B of the data display screen 4 through a wire; the current positive terminal I+ and the current negative terminal I- of the current acquisition board are respectively connected to the current positive terminal I+ and the current negative terminal I- of the shunt through wires; the high-level S+ of the communication line of the national standard 9-pin fast-charging female socket 5 is connected to the high-level input end S+i of the communication line of the fast-charging national standard protocol board through a wire; the low-level S- of the communication line of the national standard 9-pin fast-charging female socket 5 is connected to the low-level input end S-i of the communication line of the fast-charging national standard protocol board through a wire; the low-voltage positive terminal A+, the low-voltage negative terminal A-, the first connection confirmation line terminal CC1, the second connection confirmation line terminal CC2, the ground wire terminal PE, the high-voltage positive terminal DC+ and the high-voltage negative terminal DC- of the national standard 9-pin fast-charging female socket 5 are respectively connected to the corresponding ports of the national standard 9-pin fast-charging male socket 6 through wires.

[0030] Embodiment 1

[0031] In this embodiment, a new energy vehicle power battery capacity detection device is used to obtain the total capacity of the power battery pack, which specifically includes the following operation steps:

[0032] 1. Discharge the new energy vehicle to be measured until the remaining available power value (SOC) shows 0%;

[0033] 2. Insert the national standard 9-pin fast-charging male socket 6 of the new energy vehicle power battery capacity detection device into the fast-charging port of the new energy vehicle to be measured;

[0034] 3. Insert the external charging pile gun head into the national standard 9-pin fast-charging female socket 5 of the new energy vehicle power battery capacity detection device;

[0035] 4. Start the external charging pile to charge the new energy vehicle to be tested until the battery of the new energy vehicle to be tested is fully charged;

[0036] 5. After the battery of the new energy vehicle to be tested is fully charged, observe the data display screen 4. At this time, the charging power, charging capacity, charging time, and charging power data are displayed on the data display screen 4;

[0037] 6. According to the ratio of the rated capacity value marked on the vehicle nameplate of the new energy vehicle to be tested to the capacity value of this charging, calculate the remaining capacity value of the battery pack of the current new energy vehicle.

[0038] Embodiment 2

[0039] In this embodiment, a new energy vehicle power battery capacity detection device is used to detect the actual charging efficiency of an external charging pile, which specifically includes the following operation steps:

[0040] 1. Open the fast charging port of the new energy vehicle to be tested;

[0041] 2. Insert the national standard 9-pin fast charging male head seat 6 of the new energy vehicle power battery capacity detection device into the fast charging port of the new energy vehicle to be tested;

[0042] 3. Insert the gun head of the external charging pile into the national standard 9-pin fast charging female head seat 5 of the new energy vehicle power battery capacity detection device;

[0043] 4. Start the external charging pile to charge the new energy vehicle with 10 KWh of electricity;

[0044] 5. Stop the external charging pile from charging and observe the data display screen 4. At this time, the charging power, charging capacity, charging time, and charging power data are displayed on the data display screen 4;

[0045] 6. According to the ratio of the output power value displayed on the external charging pile to the power value charged by this device, calculate the actual charging efficiency of the charging pile.

[0046] Finally, it should be noted that the purpose of publishing the embodiments is to help further understand the present invention. However, those skilled in the art can understand that various substitutions and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the present invention should not be limited to the content disclosed in the embodiments, and the scope of protection claimed by the present invention is defined by the scope of the claims.

Claims

1. A detection device for the battery capacity of a new energy vehicle, characterized in that The power battery capacity detection device for new energy vehicles includes: a housing, an auxiliary power supply, a charging port, a switch, a data display screen, a current acquisition board, a shunt, a fast charging national standard protocol board, a fast charging female head seat, and a fast charging male head seat; among them, the auxiliary power supply, the fast charging national standard protocol board, the current collector, and the shunt are respectively arranged inside the housing; the charging port, the switch, and the data display screen are respectively arranged on the surface of the housing; the fast charging female head seat and the fast charging male head seat are respectively arranged on both sides of the housing; the charging port is connected to the auxiliary power supply through a wire; the positive extreme of the auxiliary power supply is respectively connected to the data display screen, the current acquisition board, the fast charging national standard protocol board, the fast charging female head seat, and the fast charging male head seat through a wire; the negative extreme of the auxiliary power supply is connected to one end of the switch through a wire; the other end of the switch is respectively connected to the data display screen, the current acquisition board, the fast charging national standard protocol board, the fast charging female head seat, and the fast charging male head seat through a wire; the low-voltage end and the communication end of the data display screen are respectively connected to the low-voltage end and the communication end of the fast charging male head seat and the low-voltage end and the communication output end of the fast charging national standard protocol board through a wire; the signal end of the data display screen is connected to the signal end of the current acquisition board through a wire; the high-voltage positive extreme of the current acquisition board is connected to the high-voltage positive extreme of the fast charging male head seat through a wire; the current end of the current acquisition board is connected to the current end of the shunt through a wire; the communication end of the fast charging female head seat is connected to the communication input end of the fast charging national standard protocol board through a wire; the communication output end of the fast charging national standard protocol board is connected to the communication end of the fast charging male head seat through a wire; the ports of the fast charging female head seat other than the communication end are respectively connected to the corresponding ports of the fast charging male head seat through a wire.

2. The power battery capacity detection device for new energy vehicles according to claim 1, characterized in that The fast charging female head seat adopts a national standard 9-hole fast charging female head seat, including nine ports: low-voltage positive extreme A+, low-voltage negative extreme A-, communication line high-level end S+, communication line low-level end S-, first connection confirmation line end CC1, second connection confirmation line end CC2, ground wire end PE, high-voltage positive extreme DC+, and high-voltage negative extreme DC-; the low-voltage positive extreme A+ and the low-voltage negative extreme A- are collectively referred to as the low-voltage end, and the communication line high-level end S+ and the communication line low-level end S- are collectively referred to as the communication end; correspondingly, the fast charging male head seat adopts a national standard 9-hole fast charging male head seat, and the nine ports are the same as those of the national standard 9-hole fast charging female head seat; the fast charging national standard protocol board includes a communication line high-level input end S+i, a communication line low-level input end S-i, a communication line high-level output end S+o, a communication line low-level output end S-o, a low-voltage positive extreme A+, and a low-voltage negative extreme A-; the communication line high-level input end S+i and the communication line low-level input end S-i are collectively referred to as the communication input end, and the communication line high-level output end S+o and the communication line low-level output end S-o are collectively referred to as the communication output end; the data display screen includes a low-voltage positive extreme A+, a low-voltage negative extreme A-, a communication line high-level end S+, a communication line low-level end S-, a first signal end A, and a second signal end B; the first signal end A and the second signal end B are collectively referred to as the signal end; the current acquisition board includes a high-voltage positive extreme DC+, a first signal end A, a second signal end B, a low-voltage positive extreme A+, a low-voltage negative extreme A-, a current positive end, and a current negative end; the current positive end and the current negative end are collectively referred to as the current end.

3. The power battery capacity detection device for new energy vehicles according to claim 1, characterized in that, The external charger charges the auxiliary power supply through the charging port.

4. The power battery capacity detection device for new energy vehicles according to claim 1, wherein, The external charging pile gun head is inserted into the fast charging female head seat, and the fast charging male head seat is inserted into the fast charging port of the new energy vehicle under test.

5. The power battery capacity detection device for new energy vehicles according to claim 1, characterized in that, The auxiliary power supply uses a lithium battery.

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