A power battery inspection device

Abstract

The present application relates to battery detection and monitoring technical field, specifically to a kind of power battery inspection device, by being equipped with multiple installation slot in shell, top is equipped with cover plate by buckle installation;Installation slot is adaptively installed with installation module, the module includes mounting block, and the top of mounting block is equipped with connecting wire, and connecting wire movably connects probe, and the inside of mounting block is equipped with the accommodating cavity for the up-and-down movement of probe, and the bottom of installation slot is opened with probe hole;Probe circumferential side is articulated connecting rod, and the other end of connecting rod is articulated wedge-shaped block, and the inside of mounting block is equipped with the telescopic slot for the lateral direction of wedge-shaped block Guiding, when mounting block is inserted into installation slot, wedge-shaped block with downward inclined surface slides into clamping groove along wedge-shaped protrusion;When probe contacts electrode, wedge-shaped block is further pushed out to lock. By the mechanical locking structure of wedge-shaped block and clamping groove, combined with the self-reinforcing locking mechanism of probe after being pressed, the stability of mounting block in vibrating environment is significantly improved, and the continuous and reliable contact of probe and battery pole is ensured.

Description

Technical Field

[0001] This invention relates to the field of battery testing and monitoring technology, and in particular to a fast, portable or vehicle-mounted power battery inspection device suitable for electric vehicles, energy storage battery packs, and portable power systems. Background Technology

[0002] With the rapid development of new energy vehicles, energy storage power stations, and various portable electronic devices, battery safety, performance, and lifespan monitoring have become key technologies. Currently, battery inspection devices mostly adopt a modular design, using multiple probes to contact the battery terminals to collect voltage and current data. Traditional inspection devices have the following problems:

[0003] The probe and battery terminal are only kept in contact by spring pressure, which is prone to loosening in the presence of vehicle movement or equipment vibration, resulting in increased contact resistance and inaccurate data collection. The inspection device itself lacks a real-time self-checking mechanism. Once the probe has poor contact or the internal mechanical structure fails, the source of the fault cannot be identified in time, leading to false alarms or missed alarms. The structure is complex, and installation and maintenance are inconvenient, especially in the case of multiple batteries connected in series, where the electrical connection and mechanical fixation between the mounting blocks are quite cumbersome.

[0004] Chinese patent CN116577660A discloses a battery inspection device that integrates probes and connecting wires via a connecting block, simplifying the installation process. However, this device still relies on a cover plate for clamping and fixing, which can easily lead to poor probe contact in vibration environments, and it lacks real-time self-testing and fault location functions.

[0005] Therefore, there is an urgent need for a power battery inspection device with active locking, real-time self-inspection and vibration adaptation capabilities. Summary of the Invention

[0006] The purpose of this invention is to provide a power battery inspection device that solves the problems of unreliable probe contact and lack of real-time fault diagnosis in the prior art by combining mechanical locking with electrical self-testing, thereby improving the accuracy of battery monitoring data and system reliability.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A power battery inspection device includes a housing with multiple mounting slots staggered along the battery arrangement direction. A cover plate is attached to the top via a snap-fit. An installation module is fitted into each mounting slot. This module includes a mounting block with a connecting wire at its top, which is movably connected to a probe. The mounting block has a cavity for the probe to move up and down, and a probe hole is formed at the bottom of the mounting slot. A connecting rod is hinged to the periphery of the probe, and a wedge block is hinged to the other end of the connecting rod. The mounting block has a telescopic groove for laterally guiding the wedge block, and a spring groove above the telescopic groove, which houses a return spring and a connecting block. The connecting block connects to the wedge block, and the return spring causes the wedge block to extend outwards. An insertion slot is formed in each mounting slot, and an upward-sloping wedge-shaped protrusion is formed on its side wall. A locking groove is formed below the wedge protrusion. When the mounting block is inserted into the mounting slot, the downward-sloping wedge block slides into the locking groove along the wedge protrusion. When the probe contacts the electrode, it pushes the wedge block to extend further and lock.

[0009] Furthermore, a spring seat is fixedly installed around the probe, and a compression spring is connected to the spring seat and sleeved around the probe. A movable sleeve is connected to the top of the compression spring and is movably sleeved on the probe. The connecting rod is hinged to the movable sleeve, and an unlocking post is connected to the movable sleeve. A button slot is opened at the top of the mounting block, and the top of the unlocking post extends into the button slot.

[0010] Furthermore, the mounting groove opening is provided with two sets of opposing notches for lifting the mounting block, and the side of the mounting block opposite to the notches is provided with anti-slip texture.

[0011] Furthermore, a movable block is installed in the slot, and a compression spring is connected to the movable block. The compression spring causes the movable block to press against the wedge block inserted into the slot. A resistor is installed on the top of the slot, and a self-test circuit is connected to both ends of the resistor. The movable block and the resistor are electrically connected, and the other end of the movable block is connected to the self-test circuit. The movable block and the resistor together constitute a sliding rheostat. The self-test circuit includes a constant current source, a current detection module, and a microcontroller, which is used to determine the locking state of the wedge block by detecting the change in the resistance value of the sliding rheostat.

[0012] Furthermore, it also includes a monitoring module, an analysis unit, a judgment unit, and a display unit; the monitoring module is used to collect the voltage and current signals of each battery cell; the analysis unit is implemented based on a microcontroller and is used to compare the data collected by the monitoring module with a preset normal parameter range. If the data is continuously abnormal for more than a preset delay time, it is determined that the battery data is abnormal and a fault signal with the mounting block number is generated; the judgment unit is used to retrieve the self-test circuit data of the corresponding mounting block after receiving the fault signal, and distinguish between battery abnormality and probe contact abnormality based on whether the resistance value of the sliding rheostat is within a preset normal operating range; the display unit is used to display the fault type and the corresponding mounting block number.

[0013] Furthermore, the method for determining whether the probe contact is normal includes: real-time monitoring of the self-test circuit loop current; if the current exceeds the normal threshold range, timing and spectrum analysis are initiated; if the abnormal duration is shorter than the preset threshold and the current waveform shows periodic changes in a specific vibration frequency band, it is determined to be vibration interference; otherwise, it is determined to be poor contact.

[0014] Furthermore, within the housing, the self-test circuits connected to the two sets of mounting slots and their corresponding mounting blocks arranged alternately along the power battery layout direction are connected in series, forming a series sliding rheostat structure for collaborative diagnosis of adjacent monitoring points.

[0015] Furthermore, the side of the housing has an opening for the connecting wire to extend out.

[0016] Furthermore, a guide groove is provided below the telescopic groove to guide the movement of the connecting rod.

[0017] Furthermore, the lower end of the connecting rod is connected to the probe, and the upper end is connected to the wedge block.

[0018] Furthermore, the slot is a simple mechanical groove; a linear Hall sensor is fixedly installed on the inner wall of the slot, and a small permanent magnet is fixedly embedded on the side of the wedge block; the Hall sensor is used to directly monitor the locking depth of the wedge block by detecting the position change of the permanent magnet.

[0019] The beneficial effects of this invention are:

[0020] This invention provides two complementary implementation methods that together achieve the following beneficial effects:

[0021] High-reliability locking: The mechanical locking structure of the wedge block and the slot, combined with the self-reinforcing locking mechanism after the probe is compressed, significantly improves the stability of the mounting block in a vibration environment and ensures continuous and reliable contact between the probe and the battery terminal.

[0022] Intelligent self-testing and diagnosis: It can monitor the status of the locking mechanism in real time, realize online diagnosis of hardware status, accurately distinguish between battery body faults and contact faults of the inspection device itself, and effectively identify vibration interference to reduce false alarms.

[0023] Flexible implementation plan:

[0024] Example 1 adopts a sliding rheostat self-testing scheme integrated inside the installation module, which has the advantages of high modularity, convenient maintenance and replacement, and providing an absolute mechanical measurement benchmark. It is suitable for scenarios with high requirements for plug-in and unplugging convenience.

[0025] Example 2 adopts a Hall sensor fixed on the housing for direct monitoring, which has the advantages of extremely simplified structure, no non-contact wear, and extremely high long-term reliability. It is particularly suitable for harsh environments such as vehicles with continuous high-intensity vibration.

[0026] Collaborative diagnostic capability: Through series circuit or signal comparison design, collaborative diagnosis of the hardware status of adjacent monitoring points can be achieved, improving the overall reliability of the system. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure after the cover is opened;

[0029] Figure 3 This is a schematic diagram of the housing structure after the installation modules have been removed.

[0030] Figure 4 This is a schematic diagram of the installation module structure;

[0031] Figure 5 This is a schematic diagram of the assembly section;

[0032] Figure 6 for Figure 5 A magnified view of part A in the middle;

[0033] Figure 7 This is a diagram showing the module in its detached state.

[0034] Figure 8 This is a system workflow diagram;

[0035] Figure 9 This is a partial structural diagram of the mounting groove according to Embodiment 2 of the present invention.

[0036] The diagram is marked as follows:

[0037] 101. Housing; 102. Cover plate; 103. Mounting groove; 104. Insertion groove; 105. Protrusion; 106. Slot; 107. Moving block; 108. Compression spring; 109. Resistance element; 110. Probe hole; 111. Wedge-shaped protrusion; 201. Mounting block; 202. Connecting wire; 203. Probe; 204. Spring seat; 205. Compression spring; 206. Moving sleeve; 207. Connecting rod; 208. Guide groove; 209. Wedge block; 210. Spring groove; 211. Return spring; 212. Connecting block; 301. Electrode plate; 302. Positive electrode groove; 303. Negative electrode groove; 401. Linear Hall sensor; 402. Permanent magnet. Detailed Implementation

[0038] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the scope of protection of the present invention.

[0039] Example 1

[0040] like Figures 1 to 8 As shown, this embodiment provides a power battery inspection device, including a housing 101 made of flame-retardant ABS material. The housing 101 has multiple mounting slots 103 arranged in a staggered pattern along the battery arrangement direction inside. A cover plate 102 is attached to the top via a snap-fit. An installation module is adapted to be installed in each mounting slot 103. The installation module includes a mounting block 201, with a connecting wire 202 on the top of the mounting block 201. The connecting wire 202 is made of silicone insulated wire and is movably connected to a probe 203. The mounting block 201 has a cavity inside for the probe 203 to move up and down, and a probe hole 110 is opened at the bottom of the mounting slot 103.

[0041] A spring seat 204 is fixedly mounted on the periphery of the probe 203. A compression spring 205 is connected to the spring seat 204, and a movable sleeve 206 is connected to the top of the compression spring 205. The movable sleeve 206 is movably fitted onto the probe 203 and hinged to a connecting rod 207. The other end of the connecting rod 207 is hinged to a wedge block 209. The mounting block 201 has a telescopic groove for laterally guiding the wedge block 209. A spring groove 210 is provided above the telescopic groove, in which a return spring 211 and a connecting block 212 are installed. The return spring 211 gives the wedge block 209 an outward extension tendency.

[0042] The mounting slot 103 has an insertion slot 104, and its side wall has an upward-sloping wedge-shaped protrusion 111. Below the wedge-shaped protrusion 111 is a retaining groove 106. A moving block 107 is installed in the retaining groove 106, and the moving block 107 is connected to a compression spring 108. A resistor 109 is installed on the top of the retaining groove 106. The resistor 109 is a ceramic-based thick-film resistor with a total designed resistance of 5kΩ. The moving block 107 and the resistor 109 are connected by gold-plated elastic metal contacts, forming a sliding rheostat. When the wedge block 209 is inserted into the retaining groove 106 and abuts against the moving block 107, the position of the moving block 107 on the resistor 109, i.e., the resistance value of the sliding rheostat, is linearly related to the locking depth of the wedge block 209.

[0043] Self-test circuit and locking status monitoring: The self-test circuit includes a constant current source providing a constant current of 1mA, a current detection module consisting of a high-precision differential amplifier, and a microcontroller as the control core. Optionally, the high-precision amplifier is an INA219, and the microcontroller is an STM32F407VGT6. The microcontroller integrates an analog-to-digital converter (ADC). The output current I_ref of the constant current source is 1mA, or 0.001A. The current detection module measures the voltage drop V_sense across the sliding rheostat and sends this analog voltage signal to the microcontroller's ADC input pin. The microcontroller's ADC samples V_sense at a sampling frequency of 200Hz and converts it into a digital value. According to Ohm's law R=V / I, the microcontroller calculates the resistance of the sliding rheostat in real time: R_slide=V_sense / 0.001. When mounting block 201 is correctly installed and probe 203 is in good contact, wedge block 209 is in the fully locked position, and moving block 107 is pushed to the middle area of ​​resistor 109. At this time, the measured R_slide should be within a preset "normal locking resistance range", such as [1kΩ, 10kΩ]. This range is calculated based on the total resistance of the resistor 5kΩ and the effective stroke of the locking mechanism. If R_slide continues to deviate from this range, it indicates that the locking has failed or the probe is not in contact.

[0044] Battery parameter monitoring and basic fault diagnosis:

[0045] The monitoring module uses a high-precision 24-bit analog-to-digital converter (ADC) chip, ADS131A04, to acquire the voltage of each individual battery cell, and an ACS712 current sensor to acquire the total current of the battery pack. The microcontroller runs a battery parameter monitoring and initial fault diagnosis algorithm, which executes periodically at a frequency of 100Hz. This sampling frequency is based on the Nyquist sampling theorem and is sufficient to capture slowly changing signals in the battery system. The algorithm flow is as follows:

[0046] Data acquisition: Synchronously read the voltage value U_i and total current value I_total of all battery cells, where i is the installation block number.

[0047] Threshold comparison: Compare each U_i with the preset battery safety voltage range [2.5V, 4.2V]; calculate the instantaneous fluctuation rate of I_total. This battery safety voltage range is applicable to common lithium-ion batteries and can also be determined according to actual operating conditions.

[0048] Delayed Acknowledgment and Marking: To avoid interference from instantaneous load changes, an acknowledgment delay T_hold is set, which is optional, for example, 5 seconds. If the duration of T_hold for a certain U_i exceeds the safe range, or the duration of T_hold for the volatility of I_total exceeds a preset stability threshold, which is optional, for example, ±10%, then the data at that monitoring point is determined to be abnormal. The microcontroller then generates a primary fault signal containing the abnormal mounting block number N_fault.

[0049] Fault root cause analysis and self-test linkage: The fault root cause analysis algorithm runs simultaneously within the microcontroller. Upon receiving a primary fault signal, this algorithm is triggered.

[0050] Receive location: parse the signal and obtain the faulty installation block number N_fault.

[0051] Check hardware status: Immediately read the self-test circuit data of the mounting block corresponding to the number N_fault, that is, the current resistance value R_N of the sliding rheostat.

[0052] Root cause decision:

[0053] If R_N is within the preset "normal locking resistance range" [1kΩ, 10kΩ], it indicates that the inspection device itself is working normally, that is, the probe contact and locking mechanism are normal, and the data abnormality originates from the battery itself. The algorithm generates the final judgment: "Battery cell abnormality, number: N_fault".

[0054] If R_N deviates from the range of [1kΩ, 10kΩ], it indicates that the abnormality in the monitoring circuit is likely caused by poor probe contact or failure of the locking mechanism. The algorithm generates the final judgment: "Inspection device contact fault, location: N_fault".

[0055] Output results: The final judgment result is sent to the display unit for visual alarm and can be reported through the communication interface. Optionally, the display unit is a 0.96-inch OLED display.

[0056] Vibration Interference Identification: To distinguish between genuine hardware faults and transient contact fluctuations caused by vehicle vibration, a vibration identification algorithm is embedded in the self-test circuit monitoring.

[0057] Real-time monitoring: The self-test loop current I_loop is monitored at a frequency of 200Hz, and its normal range is set to [0.95mA, 1.05mA]. This range already includes the accuracy margin of the constant current source itself.

[0058] Abnormal trigger: When I_loop exceeds the normal range, a short timer is immediately started to record the duration of the abnormality, T_vib.

[0059] Spectrum determination:

[0060] If T_vib is less than the preset "vibration judgment threshold" T_vib_th, which can be optionally 2 seconds, then the I_loop sampling data sequence during the over-limit period is extracted and subjected to Fast Fourier Transform (FFT) analysis.

[0061] If the FFT spectrum shows significant periodic peaks in the typical vehicle mechanical vibration frequency band, i.e., 5Hz to 50Hz, then the anomaly is determined to be vibration interference, and the system suppresses the alarm.

[0062] If T_vib exceeds T_vib_th, or if the FFT analysis does not show obvious vibration spectrum characteristics, it is determined to be a persistent poor contact, triggering a hardware fault alarm.

[0063] Series Self-Test and Collaborative Diagnosis: For two staggered mounting blocks, such as mounting blocks A and B, monitoring adjacent terminals of the same battery string, their self-test circuits are connected in series. The microcontroller measures the total voltage V_total after series connection and calculates the total resistance R_total = V_total / 0.001. When both are normal, R_total should be within the theoretical range [2kΩ, 20kΩ], which is the sum of the normal ranges of the two independent sliding rheostats. If R_total is abnormal, the microcontroller can further locate which mounting block has an abnormal resistance by measuring the voltage divider point between A and B, thus achieving collaborative diagnosis of the critical monitoring circuit.

[0064] During installation, the mounting block 201 is inserted into the mounting slot 103, and the wedge block 209 slides into the slot 106 along the inclined surface of the wedge-shaped protrusion 111. After the probe 203 contacts the battery terminal, it is pressed upward, which pushes the wedge block 209 further outward through the connecting rod 207, achieving self-reinforcing locking. During disassembly, the unlocking pin is pressed, causing the moving sleeve 206 to move downward. The connecting rod 207 drives the wedge block 209 to retract, allowing the mounting block 201 to be removed.

[0065] Key elastic components such as compression spring 205 and return spring 211 are made of 65Mn spring steel to improve fatigue life. A silicone sealing ring is provided at the joint between housing 101 and cover plate 102 to improve environmental adaptability.

[0066] Example 2

[0067] like Figure 9 As shown, this embodiment provides a variant with a simpler structure and higher reliability. The internal mechanical structure of its mounting block 201, including probe 203, spring seat 204, compression spring 205, moving sleeve 206, connecting rod 207, wedge block 209, return spring 211, and connecting block 212, is exactly the same as that in Embodiment 1, and will not be described again here.

[0068] The improvement in this embodiment lies in the significant simplification and optimization of the self-test structure on the mounting slot 103 side:

[0069] The slot 106 is a simple mechanical groove, and there are no longer moving blocks, compression springs and resistors inside it.

[0070] A linear Hall sensor 401 is fixedly installed on the inner wall of the slot 106. Correspondingly, a small permanent magnet 402 is fixedly embedded on the side of the wedge block 209. The signal line of the Hall sensor 401 is connected to the main control circuit of the inspection device.

[0071] Working and monitoring principles:

[0072] When the mounting block 201 is inserted into the mounting slot 103, and the wedge block 209 is engaged in the slot 106 under the action of the return spring 211, the permanent magnet 402 enters the sensing area of ​​the Hall sensor 401.

[0073] When the probe 203 contacts the battery terminal and moves upward under pressure, the connecting rod 207 pushes the wedge block 209 to extend further outward against the tension of the return spring 211. At this time, the permanent magnet 402 is displaced relative to the stationary Hall sensor 401.

[0074] The Hall sensor 401 outputs an analog voltage signal V_hall in real time, which is proportional to the distance to the permanent magnet 402. The microcontroller acquires this signal via an ADC. Through pre-calibration, the voltage value V_init when the wedge block 209 is in the "initial locking" position and the voltage value V_lock when it is in the "fully locked" position can be determined, thereby determining a "normal locking voltage range" [Vlock, Vinit].

[0075] Diagnostic logic:

[0076] The diagnostic program running within the microcontroller is configured to perform the following operations:

[0077] Status monitoring: Continuously monitor V_hall. If its value is stable within the range of [Vlock, Vinit], the installation block is determined to be in a normal locking state.

[0078] Fault root cause determination: When the system determines that the battery data corresponding to a certain mounting block is abnormal based on the battery monitoring data, it immediately reads the real-time V_hall value of that mounting block.

[0079] If V_hall is within the normal locking voltage range, the battery is considered faulty.

[0080] If V_hall deviates from the normal locking voltage range, it is determined that the inspection device is locking or the contact is abnormal.

[0081] Vibration identification: The system analyzes the short-term stability of the V_hall signal in real time. If the V_hall signal experiences a brief shift, such as lasting less than 2 seconds, and frequency domain analysis of the signal during this period shows significant periodic spectral components detected in the 5Hz-50Hz range after FFT, it is determined to be vibration interference and no alarm is triggered. If the shift is continuous or lacks spectral characteristics, it is determined to be a real fault.

[0082] The beneficial effects of this embodiment are as follows: While fully retaining the original reliable mechanical locking action, by replacing the self-testing method from a complex internal contact sliding rheostat to a simple, non-contact external Hall direct monitoring, the risks of failures such as wear, jamming, and poor contact caused by moving blocks, compression springs, and sliding contacts are completely eliminated. The overall structure is greatly simplified, and long-term reliability is significantly improved, especially meeting the requirements of high-vibration and long-life applications such as automotive applications.

[0083] Through the two embodiments described above, this invention provides flexible technical solutions that adapt to different reliability requirements, maintenance needs, and application scenarios, and together achieve the core objectives of highly reliable monitoring of battery status and intelligent diagnosis of the device's own health status.

Claims

1. A power battery inspection device, comprising a housing (101), wherein the housing (101) is provided with a plurality of mounting slots (103) arranged alternately along the battery arrangement direction, and a cover plate (102) is attached to the top of the housing (101) by a snap fastener; characterized in that: An installation module is adapted to be installed in the installation slot (103). The installation module includes an installation block (201). A connecting line (202) is provided on the top of the installation block (201). The connecting line (202) is movably connected to the probe (203). The installation block (201) has a receiving cavity inside for the probe (203) to move up and down. A probe hole (110) is opened at the bottom of the installation slot (103). The probe (203) is hinged to a connecting rod (207) on its periphery, and a wedge block (209) is hinged to the other end of the connecting rod (207). The mounting block (201) is provided with a telescopic groove for laterally guiding the wedge block (209). A spring groove (210) is provided above the telescopic groove. A return spring (211) and a connecting block (212) are provided in the spring groove (210). The connecting block (212) connects to the wedge block (209). The return spring (211) makes the wedge block (209) have an outward extension tendency. The mounting groove (103) has an insertion groove (104), and its side wall is provided with a wedge-shaped protrusion (111) with an upward inclined surface. A slot (106) is provided below the wedge-shaped protrusion (111). When the mounting block (201) is inserted into the mounting groove (103), the wedge block (209) with its inclined surface facing down slides into the slot (106) along the wedge protrusion (111); when the probe (203) contacts the electrode, it pushes the wedge block (209) to extend further outward and lock.

2. The power battery inspection device according to claim 1, characterized in that: A spring seat (204) is fixedly installed around the probe (203). A compression spring (205) is connected to the spring seat (204) and sleeved around the probe (203). A movable sleeve (206) is connected to the top of the compression spring (205). The movable sleeve (206) is movably sleeved on the probe (203). The connecting rod (207) is hinged to the movable sleeve (206). An unlocking post is connected to the movable sleeve (206). A button groove is opened at the top of the mounting block (201). The top of the unlocking post extends into the button groove.

3. The power battery inspection device according to claim 1, characterized in that: A movable block (107) is installed in the slot (106). The movable block (107) is connected to a compression spring (108). The compression spring (108) causes the movable block (107) to abut against the wedge block (209) inserted in the slot (106). A resistor (109) is installed on the top of the slot (106). A self-test circuit is connected to both ends of the resistor (109). The movable block (107) and the resistor (109) are connected. The other end of the movable block (107) is connected to the self-test circuit. The movable block (107) and the resistor (109) together constitute a sliding rheostat. The self-test circuit includes a constant current source, a current detection module and a microcontroller, which is used to determine the locking state of the wedge block (209) by detecting the change in the resistance value of the sliding rheostat.

4. The power battery inspection device according to claim 3, characterized in that: It also includes a monitoring module, an analysis unit, a judgment unit, and a display unit; The monitoring module is used to collect the voltage and current signals of each battery cell; The analysis unit is implemented based on the microcontroller and is used to compare the data collected by the monitoring module with the preset normal parameter range. If the data is abnormal for more than the preset delay time, it is determined that the battery data is abnormal and a fault signal with the installation block number is generated. The judgment unit is used to retrieve the self-test circuit data of the corresponding mounting block (201) after receiving the fault signal, and to distinguish between battery abnormality and probe contact abnormality based on whether the resistance value of the sliding rheostat is within the preset normal working range. The display unit is used to display the fault type and the corresponding installation block number.

5. The power battery inspection device according to claim 4, characterized in that: The judgment unit is also configured to perform vibration interference identification, including: real-time monitoring of the loop current of the self-test circuit; when the current exceeds the normal threshold range, if the abnormal duration is less than a preset time threshold and periodic components of a preset vibration frequency band are present after frequency domain analysis, it is determined to be vibration interference; otherwise, it is determined to be a contact fault.

6. The power battery inspection device according to claim 3, characterized in that: In the housing (101), the self-test circuits connected to the two sets of mounting slots (103) arranged alternately in the direction of the power battery arrangement and their corresponding mounting blocks (201) are connected in series; the microcontroller determines whether the locking state of the two sets of mounting blocks (201) is coordinated and normal by measuring whether the total resistance of the series circuit is within the preset normal series resistance range.

7. The power battery inspection device according to claim 1, characterized in that: The slot (106) is a mechanical groove; a linear Hall sensor (401) is fixedly installed on the inner wall of the slot (106), and a permanent magnet (402) is fixedly embedded on the side of the wedge block (209); the Hall sensor (401) is used to monitor the locking depth of the wedge block (209) by detecting the position change of the permanent magnet (402).

8. The power battery inspection device according to claim 7, characterized in that: It also includes a monitoring module, an analysis unit, a judgment unit, and a display unit; The monitoring module is used to collect the voltage and current signals of each battery cell; The analysis unit is implemented based on a microcontroller and is used to generate a fault signal with the installation block number when the monitoring data is continuously abnormal. The judgment unit is used to read the real-time output value of the Hall sensor (401) of the corresponding mounting block (201) after receiving the fault signal, and to distinguish between battery abnormality and inspection device locking abnormality based on whether the output value is within the preset normal locking voltage range. The display unit is used to display the fault type and location.

9. The power battery inspection device according to claim 1, characterized in that: The mounting groove (103) has two sets of opposing notches at the opening, and the mounting block (201) has anti-slip texture on the side opposite to the notches; the housing (101) has an extension opening (105) on the side for the extension of the connecting line (202); the telescopic groove has a guide groove (208) below it to guide the movement of the connecting rod (207).

10. The power battery inspection device according to claim 1, characterized in that: The lower end of the connecting rod (207) is connected to the probe (203), and the upper end is connected to the wedge block (209).

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