Insulation detection device for electric automobile
By designing an insulation testing device for electric vehicles, a rapid testing method is achieved using voltage and resistance testing terminals and modules. Anti-drop components are installed at the four corners of the casing, solving the accuracy and stability problems of existing testing methods and improving testing efficiency and equipment safety.
Patent Information
- Application Number
- CN202423094277.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2034-12-16
AI Technical Summary
Existing methods for testing the insulation of electric vehicles suffer from low accuracy, high cost, poor stability, inability to perform tests under no-load conditions of the power system, and potential impact on normal system operation or reduction of insulation level.
An insulation detection device for electric vehicles has been designed, including a housing assembly, a detection assembly, and a drop protection assembly. It performs detection through voltage detection terminals and resistance detection terminals, and combines a central processing unit, a conversion module, an insulation detection module, an early warning module, and a power control module to achieve rapid detection. Drop protection assemblies are set at the four corners of the housing to prevent accidental damage.
It enables fast, portable, and flexible testing, improving testing efficiency, and extends service life through drop protection, ensuring the safety of the equipment.
Smart Images
Figure CN223637643U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to electric automobile technical field, concretely is a kind of electric automobile insulation detection device. BACKGROUND
[0002] Electric automobile is a complex electromechanical product, and the electrical system is an important component of electric automobile. According to different purposes, the electrical system is usually divided into low-voltage electrical system and high-voltage electrical system.
[0003] The low-voltage electrical system provides power for the vehicle central controller, electronic equipment, light and windshield wiper, etc., generally adopts DC 12V or 24V power supply, and the design and construction of the low-voltage system for vehicles have relevant specifications and standards, and the technology is mature and highly reliable. The high-voltage electrical system provides power for the driving motor and other high-power components of the vehicle, mainly composed of power battery pack, power converter, motor controller and motor and other electrical equipment.
[0004] The working voltage of the high-voltage system power battery pack is generally above 300V, and the use of higher voltage specification can reduce the working current of electrical equipment and the weight of electrical equipment and the whole vehicle. However, the higher working voltage puts higher requirements on the insulation performance between the high-voltage electrical system and the vehicle chassis. There is no direct electrical connection between the high-voltage electrical system and the chassis of the electric automobile, that is, the high-voltage electrical equipment and the chassis are insulated, which is a kind of ungrounded system.
[0005] The aging of cable insulation medium of DC high-voltage system or the influence of humid environment and other factors will cause the insulation performance between the high-voltage electrical system and the vehicle chassis to decrease, and the positive or negative lead of the power supply will form a leakage loop between the insulation layer and the chassis, causing the potential of the vehicle chassis to rise, affecting the normal work of the low-voltage electrical and motor controller, and endangering the personal safety of the driver and passengers. When multiple-point insulation performance decreases between the high-voltage circuit of the vehicle and the chassis, heat accumulation effect will occur, which may cause electrical fire in severe cases.
[0006] The main insulation detection methods at present are:
[0007] 1. Signal injection method: high-frequency alternating current signal is injected into the electrical system, and the signal is collected back by connecting the other end to the ground or vehicle body, and the insulation resistance is calculated by calculating the change of amplitude and phase. The disadvantages are: first, the detection accuracy is greatly affected by the system distribution capacitance, and second, the injection of alternating current signal into direct current system actually introduces a disturbance source into the direct current system, which affects the normal work of the direct current system, and the circuit is complex, the cost is high and the stability is poor.
[0008] 2. Current sensing method: the positive and negative poles of the power system to be tested are passed through the current sensor in the same direction, when there is no leakage current, the current flowing out of the positive pole of the power supply is equal to the current returning to the negative pole of the power supply, therefore, the current passing through the current sensor is zero. According to the positive and negative of the voltage, it can be further judged whether the leakage current is from the positive pole or the negative pole of the power supply. However, the premise of applying this detection method is that the power to be tested must be in working condition, and there must be inflow and outflow of working current. The disadvantage is that it cannot evaluate the insulation performance of the power supply to ground under the condition of no load of the power supply system, and it cannot detect when both ends leak or the system leaks in the middle.
[0009] 3. Auxiliary power supply method: use a storage battery, connect the positive pole of the storage battery with the negative pole of the high-voltage DC current power supply to be tested, and connect the negative pole of the storage battery with the locomotive shell to realize one-point grounding. In the case of good insulation performance of the system to be tested, the storage battery has no current loop, and the leakage current is zero. In the case of cable insulation damage or aging and wetness, the storage battery forms a closed loop through the insulation layer to generate a leakage current, and an alarm is given according to the size of the leakage current, and the power to be tested is turned off. The obvious disadvantage is that one point of the storage battery is directly grounded, which is absolutely not allowed on an electric vehicle.
[0010] 4. Balanced bridge method: using the principle of bridge circuit, we can consider that the positive and negative bus bars of the DC system of the device to be tested have a fixed insulation resistance to ground, and the two insulation resistances can be considered equal in the case of good insulation. The positive and negative terminals can be used as two bridge arms, and the ground can be used as a bridge arm. In addition, two equal large resistors can be connected in series between the positive and negative bus bars, and a bridge arm is formed between the two resistors. Thus, a balanced bridge circuit is formed. A current meter is connected between the ground and the two resistors connected in series. In the case of good insulation, the current flowing between the two bridge arms is zero. Once the insulation of one end decreases, the bridge loses balance, and the current meter has current flowing through it. The obvious disadvantage of this method is that the accuracy of the circuit constructed is very high (very complex to implement), and it cannot accurately and timely alarm when the positive and negative insulation performance decreases simultaneously. Using this method itself reduces the insulation level of the system.
[0011] Based on the above problems, a new type of electric vehicle insulation detection device is proposed. Content of the utility model
[0012] This part aims to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part and the abstract of the specification and the utility model name to avoid obscuring the purpose of this part, the abstract of the specification and the utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.
[0013] In view of the problems existing in the prior art, the utility model is proposed.
[0014] Therefore, the electric vehicle insulation detection device has the advantages of small volume, convenient carrying, high flexibility, high safety, and long service life.
[0015] To solve the above technical problems, according to one aspect of the present application, the present application provides the following technical scheme:
[0016] An electric vehicle insulation detection device comprises:
[0017] The shell assembly comprises a shell, a display unit arranged at the top of the front surface of the shell, a key module arranged at the bottom of the front surface of the shell, a voltage detection end arranged at one side of the top of the shell, and a resistance detection end arranged at the other side of the top of the shell.
[0018] The detection assembly comprises a central processing unit arranged in the middle of the inner cavity of the shell, a conversion module arranged at the top of the inner cavity of the shell, an insulation detection module arranged in the middle of the inner cavity of the shell, a pre-warning module arranged in the middle of the inner cavity of the shell, a protection module arranged in the middle of the inner cavity of the shell, an electric energy control module arranged in the middle of the inner cavity of the shell, a PWM signal switching module arranged in the middle of the inner cavity of the shell, and a power module arranged at the bottom of the inner cavity of the shell.
[0019] The anti-falling assembly comprises a protective sleeve arranged at the four corners of the shell, a buffer pad arranged at the bottom of the inner cavity of the protective sleeve, a buffer arranged at the top of the buffer pad, and a connecting sleeve arranged at the top of the buffer.
[0020] As a preferred scheme of the electric vehicle insulation detection device, the display unit comprises a display screen and a loudspeaker.
[0021] As a preferred scheme of the electric vehicle insulation detection device, the two sides of the shell are provided with fixed straps, and the fixed straps are provided with a magic daughter patch and a magic mother patch.
[0022] As a preferred scheme of the electric vehicle insulation detection device, the top of the shell is provided with a winding column matched with the voltage detection end and the resistance detection end.
[0023] As a preferred scheme of the electric vehicle insulation detection device, the bottom of the shell is provided with a charging interface connected with the power module.
[0024] As a preferred scheme of the electric vehicle insulation detection device, the input end of the conversion module is connected with the voltage detection end and the resistance detection end.
[0025] As a preferred scheme of the electric vehicle insulation detection device, the buffer member comprises a damper and a buffer spring, and the buffer spring is arranged on the surface of the damper.
[0026] As a preferred scheme of the electric vehicle insulation detection device, the connecting sleeve is connected with the four corners of the shell.
[0027] Compared with the prior art, the electric vehicle insulation detection device has the following beneficial effects:
[0028] The voltage and the resistance are detected by the voltage detection end and the resistance detection end, and the rapid detection is realized by cooperating with the central processing, the conversion module, the insulation detection module, the early warning module, the protection module and the electric energy control module, so that the device has the advantages of small size, convenient carrying and high flexibility, and the detection efficiency is improved.
[0029] In addition, the anti-falling assembly is arranged on the four corners of the shell, so that the device can be prevented from being damaged by accidental falling, has high safety and helps to prolong the service life. BRIEF DESCRIPTION OF DRAWINGS
[0030] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the present application will be described in detail below in combination with the drawings and detailed embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor. Among them:
[0031] Fig. 1 It is a structural schematic diagram of the present application;
[0032] Fig. 2 It is a structural schematic diagram of the detection assembly of the present application;
[0033] Fig. 3 It is a structural schematic diagram of the anti-falling assembly of the present application.
[0034] In the figure; 100 shell assembly, 110 shell, 120 display unit, 130 key module, 140 voltage detection end, 150 resistance detection end, 160 charging interface, 170 fixed bandage, 180 winding column, 200 detection assembly, 210 central processing unit, 220 conversion module, 230 insulation detection module, 240 early warning module, 250 protection module, 260 electric energy control module, 270 PWM signal switching module, 280 power module, 300 anti-falling assembly, 310 protective sleeve, 320 buffer pad, 330 buffer, 340 connecting sleeve. DETAILED DESCRIPTION
[0035] In order to make the above-mentioned purposes, features and advantages of the utility model more apparent, obvious and easy to understand, the specific embodiments of the utility model will be described in detail below with reference to the drawings.
[0036] In the following description, a lot of specific details are set forth in order to facilitate a thorough understanding of the utility model, but the utility model can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the connotation of the utility model, therefore the utility model is not limited by the specific embodiments disclosed below.
[0037] Secondly, the utility model is described in detail in combination with the schematic diagram, when detailing the embodiments of the utility model, for the convenience of illustration, the sectional view of the device structure will be partially enlarged without the general proportion, and the schematic diagram is only an example, which should not limit the scope of protection of the utility model herein. In addition, three-dimensional spatial dimensions of length, width and depth should be included in actual manufacture.
[0038] In order to make the purposes, technical schemes and advantages of the utility model more clear, the embodiments of the utility model will be described in further detail below in combination with the drawings.
[0039] The utility model provides the following technical scheme: a kind of electric vehicle insulation detection device, in the process of using, small, portable, high flexibility, help to improve detection efficiency, with anti-falling function simultaneously, high safety, help to prolong service life;
[0040] Figs. 1-3 It is the structure schematic diagram of one embodiment of the utility model a kind of electric vehicle insulation detection device, its main part includes shell assembly 100, detection assembly 200 and anti-falling assembly 300;
[0041] The shell assembly 100 comprises a shell 110, a display unit 120 mounted on the top of the front surface of the shell 110, a key module 130 mounted on the bottom of the front surface of the shell 110, a voltage detection end 140 mounted on one side of the top of the shell 110, a resistance detection end 150 mounted on the other side of the top of the shell 110, the display unit 120 comprising a display screen and a loudspeaker, the shell 110 being provided with fixed bands 170 on both sides, and the fixed bands 170 being provided with matched magic daughter stickers and magic mother stickers, the top of the shell 110 being provided with a winding column 180 matched with the voltage detection end 140 and the resistance detection end 150, the bottom of the shell 110 being provided with a charging interface 160 connected with a power module 280, and further, the shell 110 is used for bearing the display unit 120 and other components, the display unit 120 is used for data display, the key module 130 is used for man-machine operation, the voltage detection end 140 is used for voltage detection, the resistance detection end 150 is used for resistance detection, the charging interface 160 is used for charging the power module 280, and the fixed bands 170 are used for fixing the equipment, and the winding column 180 is used for winding to prevent cable winding;
[0042] The detection assembly 200 comprises a central processing unit 210 mounted in the middle of the inner cavity of the shell 110, a conversion module 220 mounted on the top of the inner cavity of the shell 110, an insulation detection module 230 mounted in the middle of the inner cavity of the shell 110, a pre-warning module 240 mounted in the middle of the inner cavity of the shell 110, a protection module 250 mounted in the middle of the inner cavity of the shell 110, a power control module 260 mounted in the middle of the inner cavity of the shell 110, a PWM signal switching module 270 mounted in the middle of the inner cavity of the shell 110, and a power module 280 mounted on the bottom of the inner cavity of the shell 110, the input end of the conversion module 220 being connected with the voltage detection end 140 and the resistance detection end 150, and further, the central processing unit 210 is used for receiving and sending circuit signals, the conversion module 220 is used for converting the data detected by the voltage detection end 140 and the resistance detection end 150 into circuit signals, the insulation detection module 230 is used for insulation detection, the pre-warning module 240 is used for sending a pre-warning signal, the protection module 250 is used for circuit protection, the power control module 260 is used for power distribution control, the PWM signal switching module 270 is used for converting output signals, and the power module 280 is used for providing power;
[0043] The anti-falling assembly 300 comprises a protective sleeve 310 mounted on the four corners of the shell 110, a buffer pad 320 mounted on the bottom of the inner cavity of the protective sleeve 310, a buffer 330 mounted on the top of the buffer pad 320, and a connecting sleeve 340 mounted on the top of the buffer 330, the buffer 330 comprising a damper and a buffer spring, the buffer spring being sleeved on the surface of the damper, and the connecting sleeve 340 being connected with the four corners of the shell 110, and further, the anti-falling assembly 300 is used for improving the anti-falling performance of the equipment, and can prevent accidental damage caused by falling.
[0044] In combination Figs. 1-3 The electric vehicle insulation detection device of the embodiment has the following specific principles: the voltage and resistance are detected through the voltage detection end head 140 and the resistance detection end head 150, and the rapid detection is realized in cooperation with the central processing and conversion module 220, the insulation detection module 230, the early warning module 240, the protection module 250 and the electric energy control module 260, the device has small volume and high flexibility and is convenient to carry, and the detection efficiency is improved; in addition, the anti-falling assembly 300 is arranged at four corners of the shell 110, so that the device is prevented from being damaged by accidental falling and has high safety, and the service life is prolonged.
[0045] Although the utility model has been described above with reference to the embodiments, various improvements can be made and equivalent parts can be replaced without departing from the scope of the utility model. In particular, as long as there is no structural conflict, each feature in the disclosed embodiments of the utility model can be combined in any way, and the combinations are not exhaustively described in the specification only for the purpose of saving space and resources. Therefore, the utility model is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
Claims
1. An electric vehicle insulation detection device, characterized by, The application relates to a multifunctional mobile phone, which comprises a shell assembly (100), a detection assembly (200) and an anti-falling assembly (300). The shell assembly (100) comprises a shell (110), a display unit (120 arranged at the top of the front surface of the shell (110), a key module (130 arranged at the bottom of the front surface of the shell (110), a voltage detection end head (140 arranged at one side of the top of the shell (110), and a resistance detection end head (150 arranged at the other side of the top of the shell (110). The detection assembly (200) comprises a central processing unit (210 arranged in the middle of the inner cavity of the shell (110), a conversion module (220 arranged at the top of the inner cavity of the shell (110), an insulation detection module (230 arranged in the middle of the inner cavity of the shell (110), a pre-warning module (240 arranged in the middle of the inner cavity of the shell (110), a protection module (250 arranged in the middle of the inner cavity of the shell (110), an electric energy control module (260 arranged in the middle of the inner cavity of the shell (110), a PWM signal switching module (270 arranged in the middle of the inner cavity of the shell (110), and a power module (280 arranged at the bottom of the inner cavity of the shell (110). The anti-falling assembly (300) comprises a protective sleeve (310 arranged at the four corners of the shell (110), a buffer pad (320 arranged at the bottom of the inner cavity of the protective sleeve (310), a buffer piece (330 arranged at the top of the buffer pad (320), and a connecting sleeve (340 arranged at the top of the buffer piece (330).
2. The electric vehicle insulation detection device of claim 1, wherein: The display unit (120) comprises a display screen and a loudspeaker.
3. The electric vehicle insulation detection device of claim 1, wherein: The two sides of the shell (110) are provided with fixed binding belts (170), and the fixed binding belts (170) are provided with matched magic daughter stickers and magic mother stickers.
4. The electric vehicle insulation detection device of claim 1, wherein: The top of the shell (110) is provided with a winding column (180 matched with the voltage detection end head (140) and the resistance detection end head (150).
5. The electric vehicle insulation detection device of claim 1, wherein: The bottom of the shell (110) is provided with a charging interface (160 connected with the power module (280).
6. The electric vehicle insulation detection device of claim 1, wherein: The input end of the conversion module (220) is connected with the voltage detection end head (140) and the resistance detection end head (150).
7. The electric vehicle insulation detection device of claim 1, wherein: The buffer piece (330) comprises a damper and a buffer spring, and the buffer spring is arranged on the surface of the damper.
8. The electric vehicle insulation detection device of claim 1, wherein: The connecting sleeve (340) is connected with the four corners of the shell (110).