An integrated corrosion detector for a battery case and a corrosion detecting method thereof

Abstract

This invention relates to the field of corrosion detection technology and discloses an integrated corrosion detector for battery boxes and its corrosion detection method. The integrated corrosion detector includes a detector body; a loading cavity is formed within the detector body, and a PCB board is installed within the loading cavity. A metal detection element is connected to the PCB board. The detector body is filled with sealant covering the PCB board, so that the PCB board is placed in a sealed environment, while the metal detection element is exposed to the external environment. This invention achieves online monitoring of corrosion status inside the battery box through the differentiated corrosion response of the bimetallic detector. By using the bimetallic detector, the corrosion status inside the battery box is monitored in real time using resistance changes. A long-stroke detour structure can be selected to expand the detection area and range, and combined with nitrogen purging for active dehumidification, corrosion early warning and initial intervention can be completed simultaneously in a sealed state, reducing the risk of disassembly and inspection and extending battery life.

Description

Technical Field

[0001] This invention relates to the field of corrosion detection technology, and in particular to an integrated corrosion detector for battery boxes and a corrosion detection method thereof. Background Technology

[0002] Battery boxes are mainly used to install and fix battery modules, cells and related electrical connection components (such as tabs, busbars, etc.), while also playing a role in physical protection, electrical insulation and thermal management to ensure the safe operation of the battery system under various working conditions. However, in actual use, in order to maintain the air pressure balance between the inside and outside of the battery box and prevent the box from deforming or the sealing structure from being damaged due to temperature changes, ventilation holes are usually required on the battery box. Although this design can regulate the air pressure inside and outside the box, it also brings potential risks of environmental corrosion.

[0003] During the rainy season, the air humidity is high, and air carrying a large amount of water vapor can enter the battery box through the vents. Long-term accumulation can easily lead to electrochemical corrosion of metal components such as tabs and busbars inside the box, increasing contact resistance and even causing local overheating. For battery systems used in coastal cities, the salt spray content in the environment is high. Salt spray particles can also enter the box through the vents, causing a more serious salt spray corrosion effect on the components, reducing the service life and safety performance of the battery system. In addition, when the battery is used for a long time or an abnormal situation occurs, the internal electrolyte may leak. The electrolyte itself is highly corrosive. Once it leaks and adheres to the surface of the internal components, it will also accelerate the corrosion and deterioration of the metal structure.

[0004] In the aforementioned specific scenarios, corrosion problems are usually not a one-time large-area failure, but rather occur gradually from the local surface of metal components. Early manifestations may only be surface film damage, local pitting corrosion, or a slow increase in contact resistance, which are not easily detected by appearance. As corrosion progresses, the contact state at the tabs, busbars, or connection terminals may change, thereby affecting the operation of the battery system. Current maintenance methods mostly rely on periodic disassembly and inspection, visual observation, or troubleshooting after a fault. These methods are difficult to obtain information on the initial changes in corrosion inside the battery box in a timely manner. Furthermore, when the battery box has been installed at the bottom of the vehicle, inside the energy storage cabinet, or in other locations where it is inconvenient to open it frequently, disassembly and inspection will be limited by space, time, and sealing restoration requirements. Current common battery box structural designs generally lack structures that can obtain information on corrosion changes without changing the basic installation environment of the battery box, resulting in insufficient ability to identify potential hazards.

[0005] To address the aforementioned issues, this application proposes an integrated corrosion detector for battery boxes and a corrosion detection method thereof. Summary of the Invention

[0006] This invention proposes an integrated corrosion detector for battery boxes and its corrosion detection method, which solves the problems in related technologies where it is difficult to detect early local corrosion of metal components under conditions where frequent disassembly and inspection of battery boxes is difficult after installation. Existing maintenance relies on periodic or post-fault troubleshooting, lacks a structure to obtain corrosion change information without changing the installation environment, and has insufficient ability to identify hidden dangers.

[0007] The present invention proposes an integrated corrosion detector for battery boxes, comprising a detector body;

[0008] The detector body has a loading cavity, and a PCB board is installed in the loading cavity. A metal detector is connected to the PCB board. The detector body is filled with sealant covering the PCB board so that the PCB board is placed in a sealed environment, while the metal detector is exposed to the external environment.

[0009] As a further optimization of the present invention, two limiting posts are symmetrically installed at the bottom of the detector body, and two bayonet openings are provided at the bottom of the PCB board, with the two limiting posts respectively engaging with the two bayonet openings.

[0010] As a further optimization of the present invention, the detector body is provided with a wire connected to the PCB board, and the end of the wire is connected to a connector.

[0011] As a further optimization of the present invention, the PCB board integrates a data acquisition module, a data processing module and a communication module. The data acquisition module is connected to the data processing module, and the data processing module is connected to the communication module. The data acquisition module is used to acquire the resistance signal of the metal detector.

[0012] As a further optimization of the present invention, the metal detector is a short-stroke first U-shaped aluminum wire and a first U-shaped steel wire, both of which are connected to the PCB board.

[0013] As a further optimization of the present invention, two protective blocks are installed in the detector body, and two openings are opened on the PCB board. The two protective blocks pass through the two openings respectively, and the two protective blocks correspond to the first U-shaped aluminum wire and the first U-shaped steel wire respectively. An arc-shaped groove is opened on the top of each of the two protective blocks, and the middle sections of the first U-shaped aluminum wire and the first U-shaped steel wire are respectively placed in the two arc-shaped grooves.

[0014] As a further optimization of the present invention, the metal detector is a long-stroke second U-shaped aluminum wire and a second U-shaped steel wire, both of which are connected to the PCB board, and both sides of the second U-shaped aluminum wire and the second U-shaped steel wire are continuously bent and meandered.

[0015] As a further optimization of the present invention, exhaust holes are provided on both sides of the top surface of the detector body, and a blowing shaft is connected to the bottom of the exhaust hole. A gas supply component is detachably connected to the bottom of the blowing shaft, and the gas supply component is used to deliver nitrogen gas into the blowing shaft and discharge it through the exhaust hole.

[0016] As a further optimization of the present invention, the gas supply component includes a gas supply pipe and a plug, the plug being connected to the end of the gas supply pipe and being inserted into the air blowing shaft, and the gas supply pipe being used to connect to a nitrogen supply device.

[0017] A method for detecting corrosion in battery boxes, employing the aforementioned integrated corrosion detector for battery boxes, includes the following steps:

[0018] Step 1: Install the detector body on the inner wall of the battery box, exposing the metal detector to the environment inside the battery box;

[0019] Step 2: The resistance of the metal detector is collected in real time by the data acquisition module in the PCB board. The data processing module compares the collected data with the preset threshold. When the resistance exceeds the threshold, the corrosion level is determined. The communication module transmits the corrosion level of the metal detector to the outside.

[0020] Step 3: When the components inside the battery box are initially corroded, the gas supply unit delivers nitrogen to the blowing shaft on the detector body, and the nitrogen is discharged into the battery box through the exhaust port.

[0021] The above-described technical solution of the present invention has the following beneficial technical effects:

[0022] 1. Install the detector body on the inner wall of the battery box, exposing the metal detector to the environment inside the battery box. Two types of metal detectors can be used. The first type uses a short-stroke first U-shaped aluminum wire and a first U-shaped steel wire. The data acquisition module on the PCB board collects the resistance of the first U-shaped aluminum wire and the first U-shaped steel wire in real time. The first U-shaped aluminum wire is mainly used in scenarios where electrolyte leakage occurs inside the battery box and is suitable for battery boxes with aluminum alloy structures. It can simultaneously reflect the corrosion status of the box itself. The first U-shaped steel wire is mainly used in scenarios where oxygen corrosion occurs in salt spray and high humidity environments, and the corrosion product is rust. The data processing module compares the collected resistance data with a preset threshold. When the resistance exceeds the threshold, corrosion is determined. The communication module transmits the corrosion level of the metal detector to the outside, indicating that the sensitive components inside the battery box are severely corroded. This allows staff to monitor the situation inside the battery box in real time. The above design utilizes two metal wire structures to provide differentiated corrosion responses for different corrosion mechanisms. Combined with the data acquisition, processing, and communication modules on the PCB board, it can achieve online monitoring of the internal corrosion status without damaging the sealed structure of the battery box. This reduces the risk of seal failure and maintenance costs associated with traditional disassembly and inspection methods. It is suitable for scenarios where it is inconvenient to frequently open the box, such as when it is installed at the bottom of the vehicle or inside the energy storage cabinet. It improves the ability to identify early local corrosion hazards and effectively avoids safety accidents caused by increased contact resistance or local overheating.

[0023] 2. Since both the first U-shaped aluminum wire and the first U-shaped steel wire have short strokes, their exposed strokes inside the battery box are limited, which affects the detection accuracy. Therefore, the metal detector can be a second type of long-stroke second U-shaped aluminum wire and second U-shaped steel wire. The long-stroke second U-shaped aluminum wire and second U-shaped steel wire can increase the contact area with the environment inside the battery box. Furthermore, the continuous bending and meandering on both sides of the second U-shaped aluminum wire and second U-shaped steel wire can further increase their contact area with the environment inside the battery box. In addition, the second U-shaped aluminum wire and second U-shaped steel wire can extend to the vicinity of sensitive components inside the battery box, expanding the detection range. The above-mentioned use of long-stroke second U-shaped aluminum wire and second U-shaped steel wire with continuous bending and meandering arrangement increases the effective contact area between the metal detector and the corrosive environment inside the box while maintaining the bimetallic differentiated detection. It can also extend the detection range to the vicinity of sensitive components, overcome the shortcomings of the limited detection accuracy of short-stroke metal detectors, improve the sensitivity of corrosion monitoring, and capture local corrosion signals earlier. It is suitable for large battery boxes or battery boxes with complex component layouts.

[0024] 3. When the components inside the battery box are initially corroded, nitrogen can be supplied to the air blowing shaft on the detector body through the gas supply component. Then, the nitrogen is discharged into the battery box through the exhaust port. The nitrogen entering the battery box can remove moisture from the air inside the box through the vent, effectively removing the corrosion from the components. The above-mentioned introduction of nitrogen into the battery box in the early stage of corrosion, using an inert gas to discharge the humid air inside the box through the vent, can actively intervene in the early stage of corrosion, reduce the humidity level inside the box, and inhibit the continued electrochemical corrosion reaction. This not only effectively slows down the corrosion and deterioration rate of metal components such as tabs and busbars, but also reduces the risk of increased contact resistance and local overheating caused by corrosion, thereby extending the service life of the battery system and improving its safety in high humidity, salt spray and other environments. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of an integrated corrosion detector for battery boxes proposed in this invention.

[0026] Figure 2 This is a schematic diagram of the mating structure between the detector body and the PCB board in this invention;

[0027] Figure 3 This is a schematic diagram of the cooperative structure of the detector body, protective block and limiting post in this invention;

[0028] Figure 4 This is a schematic diagram of the PCB board, the first U-shaped aluminum wire, and the first U-shaped steel wire in this invention.

[0029] Figure 5 In this invention Figure 4 Overall front view;

[0030] Figure 6 This is a schematic diagram of the cooperative structure of the PCB board, the second U-shaped aluminum wire, and the second U-shaped steel wire in this invention;

[0031] Figure 7 This is a schematic diagram of the bottom structure of the detector body in this invention;

[0032] Figure 8 This is a system diagram of the PCB board in this invention.

[0033] Reference numerals: 1. Detector body; 101. Sealant; 102. Protective block; 103. Limiting post; 104. Exhaust port; 105. Wire; 106. Connector; 2. PCB board; 3. Metal detection component; 31. First U-shaped aluminum wire; 32. First U-shaped steel wire; 33. Second U-shaped aluminum wire; 34. Second U-shaped steel wire; 4. Air blowing shaft; 5. Air supply component; 51. Air supply pipe; 52. Plug. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0035] Example 1

[0036] like Figure 1-8 As shown, the present invention proposes an integrated corrosion detector for battery boxes, comprising a detector body 1;

[0037] The detector body 1 has a loading cavity, and a PCB board 2 is installed in the loading cavity. A metal detector 3 is connected to the PCB board 2. The detector body 1 is filled with sealant 101 covering the PCB board 2 so that the PCB board 2 is placed in a sealed environment, while the metal detector 3 is exposed to the external environment.

[0038] The detector body 1 is installed on the inner wall of the battery box, exposing the metal detector 3 to the internal environment of the battery box. The PCB board 2 is completely filled and covered with sealant 101 to form a sealed environment, preventing corrosive media such as water vapor, salt spray, and electrolyte from penetrating the surface of the PCB board 2 and causing short circuits or failures. The metal detector 3 is in direct contact with the air inside the battery box. When there is high humidity water vapor, salt spray particles, or leaked electrolyte in the environment, or when the metal detector 3 undergoes surface oxidation, localized erosion, or a reduction in cross-sectional area, its resistance will change accordingly, resulting in a collectable change. The PCB board 2 receives and processes this change, facilitating the acquisition of corrosion status information before severe corrosion occurs in the components inside the box. This can accurately reflect the degree of corrosion inside the battery box, enabling online monitoring of the internal corrosion status. This reduces the risk of seal failure and maintenance costs associated with traditional disassembly and inspection methods. It is suitable for scenarios where it is inconvenient to frequently open the box, such as when it is installed at the bottom of the vehicle or inside the energy storage cabinet. It improves the ability to identify early localized corrosion hazards and effectively avoids safety accidents caused by increased contact resistance or localized overheating.

[0039] In this embodiment, two limiting posts 103 are symmetrically installed at the bottom of the detector body 1, and two bayonet openings are opened at the bottom of the PCB board 2. The two limiting posts 103 are respectively inserted and engaged with the two bayonet openings.

[0040] When assembling PCB board 2, PCB board 2 is placed into the loading cavity of detector body 1, so that the two slots at the bottom of PCB board 2 are aligned with the two limiting posts 103 symmetrically installed at the bottom of detector body 1, and then pressed down. The two limiting posts 103 are inserted into the two slots respectively to achieve plug-in engagement and fixation. At the same time, the limiting posts 103 can also play a supporting role when filling sealant 101, preventing PCB board 2 from floating or shifting due to the sealant, ensuring that sealant 101 can evenly cover the surface of PCB board 2 and improve the overall sealing effect.

[0041] In this embodiment, the detector body 1 is provided with a wire 105 connected to the PCB board 2, and the end of the wire 105 is connected to a connector 106.

[0042] Connect wire 105 to PCB board 2 so that the signal collected or processed by PCB board 2 can be led out through wire 105. Connector 106 is set at the end of wire 105 to facilitate connection with external wiring harness, detection interface or vehicle communication interface.

[0043] In this embodiment, the PCB board 2 integrates a data acquisition module, a data processing module, and a communication module. The data acquisition module is connected to the data processing module, and the data processing module is connected to the communication module. The data acquisition module is used to acquire the resistance signal of the metal detector 3.

[0044] The resistance value of metal detector 3 changes due to corrosion. The data acquisition module integrated on PCB board 2 collects the resistance signal of metal detector 3 in real time and transmits the raw data to data processing module. After receiving the resistance data, data processing module compares and analyzes it with a preset threshold. When the resistance value is within the threshold range, it is determined that the current corrosion level is slight or there is no obvious corrosion. When the resistance value exceeds the threshold, data processing module further determines the corrosion level based on the magnitude of the resistance change, such as light corrosion, moderate corrosion, or severe corrosion. Subsequently, communication module transmits the determined corrosion level information to external devices, such as BMS system, so that staff can monitor the corrosion status inside the battery box in real time, take timely maintenance measures, and effectively avoid safety accidents caused by increased contact resistance or local overheating.

[0045] In this embodiment, the metal detector 3 consists of a short-stroke first U-shaped aluminum wire 31 and a first U-shaped steel wire 32, both of which are connected to the PCB board 2.

[0046] The first U-shaped aluminum wire 31 is mainly designed for scenarios involving electrolyte leakage inside the battery box. Since aluminum reacts with the chemical components in the electrolyte, when the electrolyte leaks and adheres to the surface of the first U-shaped aluminum wire 31, its resistance will rise rapidly. The data acquisition module can quickly capture this change, making it suitable for battery boxes that match aluminum alloy structures. It can also simultaneously reflect the corrosion status of the box itself. The first U-shaped steel wire 32 is mainly designed for oxygen-absorbing corrosion scenarios in salt spray and high-humidity environments. After steel undergoes electrochemical corrosion in a salt spray environment, it produces rust. Rust is a non-conductive substance, which will cause the resistance of the first U-shaped steel wire 32 to increase. The two metal wires form differentiated corrosion responses, which can cover a variety of corrosion responses, enabling the detector to accurately determine the corrosion level under different corrosion scenarios.

[0047] In this embodiment, two protective blocks 102 are installed inside the detector body 1. Two openings are opened on the PCB board 2. The two protective blocks 102 pass through the two openings respectively, and the two protective blocks 102 correspond to the first U-shaped aluminum wire 31 and the first U-shaped steel wire 32 respectively. The top of the two protective blocks 102 is provided with an arc-shaped groove, and the middle sections of the first U-shaped aluminum wire 31 and the first U-shaped steel wire 32 are respectively placed in the two arc-shaped grooves.

[0048] The protective block 102 can form a protective barrier around the middle section of the first U-shaped aluminum wire 31 and the first U-shaped steel wire 32, thereby improving the detector's anti-interference capability and service life in complex battery box environments.

[0049] It should be noted that the protective block 102 can also act as a barrier and separator during the filling of the sealant 101, making it difficult for the sealant 101 to cover the first U-shaped aluminum wire 31 and the first U-shaped steel wire 32, thus exposing them to the environment inside the box.

[0050] Example 2

[0051] Based on Example 1, for larger battery boxes, the distribution of moisture and the deposition of corrosive media inside the box are not uniform. Different corrosion intensities may exist near the vents, the condensation area at the bottom of the box, and near the busbars. If the first U-shaped aluminum wire 31 and the first U-shaped steel wire 32 are only exposed at a short distance near the detector body 1, they may not cover the key corrosion-prone areas inside the box. In this embodiment, the metal detector 3 is selected as a long-stroke structure of the second U-shaped aluminum wire 33 and the second U-shaped steel wire 34, with continuous bends and meanders on both sides. This increases the total length of the metal wires and the exposed surface area within the limited installation space, allowing the second U-shaped aluminum wire 33 and the second U-shaped steel wire 34 to contact more of the internal environment of the box, as detailed below:

[0052] In this embodiment, the metal detector 3 consists of a long-stroke second U-shaped aluminum wire 33 and a second U-shaped steel wire 34. Both the second U-shaped aluminum wire 33 and the second U-shaped steel wire 34 are connected to the PCB board 2, and both sides of the second U-shaped aluminum wire 33 and the second U-shaped steel wire 34 are continuously bent and meandered.

[0053] Compared to the short-stroke first U-shaped aluminum wire 31 and first U-shaped steel wire 32, the long-stroke second U-shaped aluminum wire 33 and second U-shaped steel wire 34 increase the effective contact area with the corrosive environment inside the battery box. The winding and circuitous design further increases the contact area, allowing the metal wires to come into more full contact with the water vapor, salt spray, or electrolyte inside the box, thereby improving the sensitivity of the corrosion response. At the same time, the long-stroke design allows the second U-shaped aluminum wire 33 and second U-shaped steel wire 34 to extend to the vicinity of sensitive components inside the battery box, such as tabs and busbars, expanding the detection range and enabling earlier capture of local corrosion signals. This overcomes the limitation of the short-stroke first U-shaped aluminum wire 31 and first U-shaped steel wire 32 in terms of detection accuracy.

[0054] It should be noted that the second U-shaped aluminum wire 33 and the second U-shaped steel wire 34 are still made of aluminum and steel in parallel, which can preserve the differentiated response to different corrosive media. Since the two long-stroke second U-shaped aluminum wires 33 and second U-shaped steel wires 34 are set on the same PCB board 2 and are collected by the same data acquisition module, the data processing module can compare the changes of the two paths, reducing the problem of insufficient judgment of a single material in complex environments. The continuous bending and meandering section can also preserve the integrity of other uncorroded paths when local areas are corroded, so that the resistance change is gradual and it is easy to distinguish early corrosion.

[0055] It should be further noted that when the second U-shaped aluminum wire 33 and the second U-shaped steel wire 34 are arranged in a continuous bending and tortuous manner, multiple corrosion observation areas can be formed between adjacent bending sections. The resistance change read by the data processing module no longer reflects only single-point corrosion, but reflects the cumulative corrosion degree of the second U-shaped aluminum wire 33 and the second U-shaped steel wire 34 along the arrangement path. This is suitable for judging whether the corrosive medium in the box has developed from local to regional diffusion.

[0056] Example 3

[0057] Based on Examples 1 and 2, once corrosion inside the battery box is in its initial stage, if only a corrosion signal is obtained without changing the environment inside the box, moisture, oxygen, and salt may continue to participate in the electrochemical reaction, and the degree of corrosion on the components inside the box will continue to accumulate. Therefore, in this embodiment, an exhaust port 104 and an air blowing shaft 4 are provided on the detector body 1, so that the detector body 1 can not only perform the corrosion detection function, but also serve as the introduction point for nitrogen to enter the box, as detailed below:

[0058] In this embodiment, exhaust holes 104 are provided on the top surfaces of both sides of the detector body 1. An air blowing shaft 4 is connected to the bottom of the exhaust hole 104. An air supply component 5 is detachably connected to the bottom of the air blowing shaft 4. The air supply component 5 is used to deliver nitrogen gas into the air blowing shaft 4 and discharge it through the exhaust hole 104.

[0059] When the data processing module on PCB board 2 determines that the components inside the battery box have undergone initial corrosion, i.e., the resistance exceeds the preset threshold, the gas supply component 5 is activated, delivering nitrogen gas to the blowing shaft 4 on the detector body 1. The nitrogen gas flows along the internal channel of the blowing shaft 4 and is finally discharged into the battery box through the exhaust holes 104 opened on both sides of the top surface of the detector body 1. The nitrogen gas entering the battery box is an inert gas and will not participate in any chemical reaction. However, when a large amount of it enters, it will squeeze the air carrying moisture inside the box out through the original vent holes of the battery box, thereby removing moisture and reducing the humidity inside the box. This active intervention measure can effectively inhibit the continued progress of electrochemical corrosion reaction in the early stage of corrosion, slow down the corrosion and deterioration rate of metal components such as tabs and busbars, and reduce the risk of increased contact resistance and local overheating caused by corrosion.

[0060] In this embodiment, the gas supply component 5 includes a gas supply pipe 51 and a plug 52. The plug 52 is connected to the end of the gas supply pipe 51 and is plugged into the air blowing shaft 4. The gas supply pipe 51 is used to connect to the nitrogen supply equipment.

[0061] One end of the gas supply pipe 51 is connected to an external nitrogen supply device, such as a nitrogen cylinder or a nitrogen generator, and the other end is connected to the end of the blowing shaft 4 via a plug 52. When nitrogen needs to be supplied to the battery box, the gas supply pipe 51 supplies nitrogen to the blowing shaft 4 and then discharges it through the exhaust port 104 on the detector body 1, so that the nitrogen diffuses evenly in the battery box.

[0062] Example 4

[0063] Based on the above embodiments, a battery box corrosion detection method is proposed, which uses the aforementioned integrated corrosion detector for battery boxes and includes the following steps:

[0064] Step 1: Install the detector body 1 on the inner wall of the battery box, so that the metal detector 3 is exposed to the environment inside the battery box;

[0065] Step 2: The resistance of the metal detector 3 is collected in real time by the data acquisition module in PCB board 2. The data processing module compares the collected data with the preset threshold. When the resistance exceeds the threshold, the corrosion level is determined. The communication module transmits the corrosion level of the metal detector 3 to the outside.

[0066] Step 3: When the components inside the battery box are initially corroded, the gas supply component 5 delivers nitrogen to the blowing shaft 4 on the detector body 1, and discharges the nitrogen into the battery box through the exhaust port 104.

[0067] The embodiments of the present invention have been described above, but the embodiments are not limited to the specific implementation methods described above. The specific implementation methods described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the embodiments described above, all of which are within the protection scope of the embodiments described above.

Claims

1. An integrated corrosion detector for battery boxes, characterized in that, Including the detector body (1); The detector body (1) has a loading cavity, and a PCB board (2) is installed in the loading cavity. A metal detector (3) is connected to the PCB board (2). The detector body (1) is filled with sealant (101) covering the PCB board (2) so that the PCB board (2) is placed in a sealed environment and the metal detector (3) is exposed to the external environment.

2. The integrated corrosion detector for battery boxes according to claim 1, characterized in that, Two limiting posts (103) are symmetrically installed at the bottom of the detector body (1), and two bayonets are opened at the bottom of the PCB board (2), with the two limiting posts (103) respectively plugged into the two bayonets.

3. The integrated corrosion detector for battery boxes according to claim 1, characterized in that, The detector body (1) is provided with a wire (105) connected to the PCB board (2), and the end of the wire (105) is connected to a connector (106).

4. An integrated corrosion detector for battery boxes according to claim 1, characterized in that, The PCB board (2) integrates a data acquisition module, a data processing module and a communication module. The data acquisition module is connected to the data processing module, and the data processing module is connected to the communication module. The data acquisition module is used to acquire the resistance signal of the metal detector (3).

5. An integrated corrosion detector for battery boxes according to claim 1, characterized in that, The metal detector (3) consists of a short-stroke first U-shaped aluminum wire (31) and a first U-shaped steel wire (32), both of which are connected to the PCB board (2).

6. An integrated corrosion detector for battery boxes according to claim 5, characterized in that, The detector body (1) has two protective blocks (102) installed inside. The PCB board (2) has two openings. The two protective blocks (102) pass through the two openings respectively, and the two protective blocks (102) correspond to the first U-shaped aluminum wire (31) and the first U-shaped steel wire (32) respectively. The top of the two protective blocks (102) is provided with an arc groove. The middle sections of the first U-shaped aluminum wire (31) and the first U-shaped steel wire (32) are respectively placed in the two arc grooves.

7. An integrated corrosion detector for battery boxes according to claim 1, characterized in that, The metal detector (3) consists of a long-stroke second U-shaped aluminum wire (33) and a second U-shaped steel wire (34). The second U-shaped aluminum wire (33) and the second U-shaped steel wire (34) are both connected to the PCB board (2). The two sides of the second U-shaped aluminum wire (33) and the second U-shaped steel wire (34) are arranged in a continuous bending and meandering manner.

8. An integrated corrosion detector for battery boxes according to claim 1, characterized in that, The detector body (1) has exhaust holes (104) on both sides of the top surface. The bottom of the exhaust hole (104) is connected to a blowing shaft (4). The bottom of the blowing shaft (4) is detachably connected to a gas supply component (5), which is used to deliver nitrogen gas into the blowing shaft (4) and discharge it through the exhaust hole (104).

9. An integrated corrosion detector for battery boxes according to claim 8, characterized in that, The gas supply component (5) includes a gas supply pipe (51) and a plug (52). The plug (52) is connected to the end of the gas supply pipe (51) and is plugged into the air blowing shaft (4). The gas supply pipe (51) is used to connect to the nitrogen supply equipment.

10. A method for detecting corrosion in a battery box, employing an integrated corrosion detector for battery boxes as described in any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Install the detector body (1) on the inner wall of the battery box, so that the metal detector (3) is exposed to the environment inside the battery box; Step 2: The resistance of the metal detector (3) is collected in real time by the data acquisition module in the PCB board (2). The data processing module compares the collected data with the preset threshold. When the resistance exceeds the threshold, the corrosion level is determined. The communication module transmits the corrosion level of the metal detector (3) to the outside. Step 3: When the components inside the battery box are initially corroded, the gas supply unit (5) delivers nitrogen to the blowing shaft (4) on the detector body (1) and discharges the nitrogen into the battery box through the exhaust port (104).

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