Hydrogen sulfide detection device

Abstract

Provided is a hydrogen sulfide detection device capable of suppressing scattering of metal particles after corrosion in a hydrogen sulfide detection device using corrosion of a metal. The hydrogen sulfide detection device is provided with a substrate having a pattern formed of a metal that is corroded by reacting with hydrogen sulfide. The pattern includes a detection portion that detects hydrogen sulfide by corrosion of a metal exposed on the surface of the substrate. The detection unit is covered with a filter that is formed so that hydrogen sulfide gas passes therethrough and particles generated by the corroded metal do not pass therethrough.

Description

Technical Field

[0001] This disclosure relates to a hydrogen sulfide detection device applied to a battery pack containing battery cells having a sulfide-based electrolyte. Background Technology

[0002] As the next generation of battery cells constituting battery packs, all-solid-state batteries have attracted attention. Compared with conventional batteries that use liquid electrolytes, all-solid-state batteries offer advantages such as higher safety and longer lifespan. In particular, all-solid-state batteries using sulfide-based electrolytes are high-capacity and high-power batteries, and are expected to be used in vehicle batteries.

[0003] On the other hand, when the battery cells used as all-solid-state batteries are configured with sulfide-based electrolytes, hydrogen sulfide gas may be generated due to malfunctions. Hydrogen sulfide gas is toxic and corrodes surrounding metal components. Therefore, there is a need for technology to properly detect hydrogen sulfide generation in battery packs housing battery cells with sulfide-based electrolytes.

[0004] Japanese Patent Application Publication No. 2017-199667 discloses a detection system that includes a resistance-changing component in a battery cell. The resistance-changing component comprises a resistance-changing material whose resistance changes due to a chemical reaction with hydrogen sulfide. Based on the detection value between the terminals of the resistance-changing component, it is determined whether hydrogen sulfide has been generated in the battery cell. Summary of the Invention

[0005] In recent years, the use of metals that are corroded by reacting with hydrogen sulfide has been considered as a technology for detecting hydrogen sulfide generation in battery packs. In this technology, hydrogen sulfide generation can be detected by detecting changes in resistance caused by metal corrosion, or by detecting wire breaks or short circuits caused by metal corrosion. By utilizing metal corrosion in this way, it is hoped that a hydrogen sulfide detection device with high detection accuracy can be achieved.

[0006] On the other hand, in hydrogen sulfide detection devices that utilize metal corrosion, particles generated by the corroded metal may become airborne. Since corroded metal is conductive, if these particles become airborne within the battery pack, they may cause short circuits and malfunctions in the equipment within the battery pack.

[0007] This disclosure was made in view of the aforementioned issues. One object of this disclosure is to provide a technique for suppressing the dispersion of corroded metal particles in a hydrogen sulfide detection device that utilizes the corrosion of metals.

[0008] One aspect of this disclosure relates to a hydrogen sulfide detection device applied to a battery pack, the battery pack being a battery pack housing battery cells having a sulfide-based electrolyte. The hydrogen sulfide detection device includes a substrate having a pattern formed of metal capable of being corroded by reacting with hydrogen sulfide. The pattern includes a detection section for detecting hydrogen sulfide by corrosion of the metal exposed on the surface of the substrate. The detection section is covered by a filter formed to allow hydrogen sulfide gas to pass through but prevent particles generated by the corroded metal from passing through.

[0009] According to this disclosure, the detection section of the substrate is covered with a filter that is configured to allow hydrogen sulfide gas to pass through while preventing particles generated from corroded metal from passing through. This maintains the detection function of the hydrogen sulfide detection device and suppresses the scattering of corroded metal particles. Attached Figure Description

[0010] Hereinafter, the features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described with reference to the accompanying drawings, wherein the same symbols denote the same elements.

[0011] Figure 1 This is a schematic diagram showing the structure of the hydrogen sulfide detection device according to the first embodiment.

[0012] Figure 2 It is a flowchart representing the processing flow performed by the monitoring circuit.

[0013] Figure 3 This is a schematic diagram illustrating the function of the filter in the detection section of the cover substrate.

[0014] Figure 4 This is a schematic diagram illustrating a first modification of the hydrogen sulfide detection device according to the first embodiment.

[0015] Figure 5 This is a schematic diagram illustrating a second modification of the hydrogen sulfide detection device according to the first embodiment.

[0016] Figure 6 This is a schematic diagram showing the structure of the hydrogen sulfide detection device according to the second embodiment. Detailed Implementation

[0017] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. Furthermore, in each drawing, the same or equivalent structures are labeled with the same reference numerals, and their descriptions are simplified or omitted.

[0018] 1. First Implementation Method

[0019] 1.1 Structure

[0020] Figure 1 This is a schematic diagram showing the structure of the hydrogen sulfide detection device 10 according to the first embodiment. Figure 1 Part (A) in the text represents the overall structure of the hydrogen sulfide detection device 10 of the first embodiment. Figure 1 Part (B) in the diagram represents a cross-sectional view of the cut line A-A' shown in part (A).

[0021] The hydrogen sulfide detection device 10 is used in a battery pack housing battery cells with sulfide-based electrolytes to detect the generation of hydrogen sulfide. The hydrogen sulfide detection device 10 is housed together with the battery cells within the battery pack. The battery cells with sulfide-based electrolytes are typically all-solid-state batteries using solid-state sulfide-based electrolytes. The shape of the battery cells is not particularly limited. For example, the battery cells can be laminated or prismatic. All-solid-state batteries using sulfide-based electrolytes offer high capacity and high output power, making them suitable for vehicle batteries. Therefore, battery packs using the hydrogen sulfide detection device 10 can also be specifically mounted in vehicle batteries.

[0022] The hydrogen sulfide detection device 10 includes a monitoring circuit 100 and a substrate 200. The substrate 200 is a printed circuit board (PCB) having a pattern 220 formed of metal. The substrate 200 may also be a flexible printed circuit board (FPC).

[0023] The monitoring circuit 100 and the substrate 200 are connected to external devices via connectors 110 and 210, respectively. Figure 1 As shown, the monitoring circuit 100 and the substrate 200 are connected by a cable 300. The pattern 220 of the cable 300 and the substrate 200 forms a wiring (hereinafter also referred to as wiring) that electrically connects the first node 401 and the second node 402. The wiring forms a single current path.

[0024] Monitoring circuit 100 monitors the voltage between first node 401 and second node 402. In monitoring circuit 100, first node 401 is connected to a power supply with voltage Vcc (e.g., 5V) via resistor 120, and second node 402 is connected to ground (GND) with a reference potential (e.g., 0V). Monitoring circuit 100 includes monitoring processing unit 130. Monitoring processing unit 130 is a computer that performs the processing of the monitored voltage. In particular, monitoring processing unit 130 can also be a microcontroller. Monitoring processing unit 130 is configured to input the potential between resistor 120 and first node 401. For example, when monitoring processing unit 130 is a microcontroller, the microcontroller's input port is connected between resistor 120 and first node 401. Resistor 120 acts as a pull-up resistor for monitoring processing unit 130. For example, the resistance value of resistor 120 is approximately 10kΩ. Monitoring circuit 100 forms a voltage divider circuit, and monitoring processing unit 130 is capable of detecting the voltage between first node 401 and second node 402.

[0025] Furthermore, Figure 1 The structure of the monitoring circuit 100 shown is one example, and other structures can also be used. For example, the voltage between the first node 401 and the second node 402 can be indirectly detected by measuring the voltage across the resistor 120. That is, monitoring the voltage between the first node 401 and the second node 402 includes monitoring the voltage across the resistor 120. Therefore, the monitoring processing unit 130 can also be configured to measure the voltage across the resistor 120. Alternatively, for example, the monitoring circuit 100 can be configured to have a pull-down resistor for the monitoring processing unit 130. That is, the first node 401 can be directly connected to the power supply, and the second node 402 can be connected to the ground terminal GND via a resistor. Furthermore, the monitoring processing unit 130 can also be configured to detect the voltage between the first node 401 and the second node 402. For example, the input port of the microcontroller is connected between the resistor and the second node 402.

[0026] The monitoring and processing unit 130 includes one or more processors 131 (hereinafter referred to as processors 131) and one or more storage devices 132 (hereinafter referred to as storage devices 132). The processors 131 perform various processes. The processors 131 may be, for example, general-purpose processors, application-specific processors, CPUs (Central Processing Units), GPUs (Graphics Processing Units), ASICs (Application Specific Integrated Circuits), FPGAs (Field-Programmable Gate Arrays), integrated circuits, existing circuits, and combinations thereof. The processors 131 may also be referred to as processing circuitry. The storage devices 132 store various information required by the processors 131 to perform processes. The storage devices 132 may be, for example, recording media such as RAM (Random Access Memory), ROM (Read Only Memory), SSDs (Solid State Drives), and HDDs (Hard Disk Drives). Storage device 132 stores a computer program that can be executed by processor 131. The computer program consists of multiple instruction codes that describe the processes that cause processor 131 to execute. The computer program is recorded in a computer-readable recording medium. The monitoring processing unit 130 performs its functions through the cooperation of processor 131, which executes the computer program, and storage device 132.

[0027] The metal used to form the pattern 220 of the substrate 200 is a metal that can be corroded by reacting with hydrogen sulfide. For example, copper or silver is used as the metal. Furthermore, the pattern 220 includes a detection section 500 for detecting hydrogen sulfide. In the first embodiment, the detection section 500 is formed by exposing a portion of the metal of the pattern 220 on the surface of the substrate 200. That is, the detection section 500 becomes the exposed metal portion of the pattern 220. This can be achieved by constructing the substrate 200 such that a portion of the pattern 220 is not surface protected (e.g., a cover layer, solder resist) or surface treated (e.g., flux, gold plating). The hydrogen sulfide detection device 10 of the first embodiment can detect the generation of hydrogen sulfide by means of the detection section 500 as described below.

[0028] Under normal conditions, when no hydrogen sulfide is generated from the battery cell, the path between node 401 and node 402 is a non-resistive current path. Therefore, the monitoring and processing unit 130 obtains the reference potential of the ground terminal GND as a detection value. Under abnormal conditions, when hydrogen sulfide is generated from the battery cell, the metal of the detection unit 500 reacts with the generated hydrogen sulfide and is corroded. When the metal becomes sulfide due to corrosion, the resistance value of the detection unit 500 increases. Furthermore, the metal tends to move radially as corrosion progresses. In addition, the corroded metal also moves when subjected to vibration or impact. For example, by applying vibration from a vehicle, the corroded metal moves. If corrosion continues in this way, the metal of the detection unit 500 gradually disappears and the cross-sectional area decreases. As a result, the resistance value of the detection unit 500 further increases. And eventually, the metal of the detection unit 500 breaks.

[0029] As the resistance value of the detection unit 500 increases, the monitoring and processing unit 130 obtains a voltage drop based on the resistance value of the detection unit 500 as a detection value. That is, as the resistance value of the detection unit 500 increases, the detection value of the monitoring and processing unit 130 rises from the reference potential. Then, when the metal of the detection unit 500 finally breaks, the power supply voltage Vcc is directly input to the monitoring and processing unit 130. That is, the monitoring and processing unit 130 obtains the voltage Vcc as a detection value.

[0030] When hydrogen sulfide is generated from the battery cell, the detection state of the detection unit 500 is manifested as the voltage between the first node 401 and the second node 402. That is, when hydrogen sulfide is generated from the battery cell, the detection value of the monitoring processing unit 130 changes from a reference potential to Vcc. Therefore, the monitoring processing unit 130 can determine whether hydrogen sulfide has been generated from the battery cell based on the change in the detection value (the voltage between the first node 401 and the second node 402). For example, if the monitoring processing unit 130 receives a change in the detection value from its initial value that exceeds a threshold, it determines that hydrogen sulfide has been generated from the battery cell. Alternatively, the monitoring processing unit 130 may also directly use the detection value without calculating the change in the detection value, and determine that hydrogen sulfide has been generated from the battery cell if the detection value exceeds a threshold.

[0031] Figure 2 This is a flowchart representing the processing flow performed by the monitoring circuit 100 (more specifically, the monitoring processing unit 130). Figure 2 The processing flow shown is executed repeatedly at each specified processing cycle.

[0032] First, in step S110, the monitoring circuit 100 acquires a detection value. Next, in step S120, the monitoring circuit 100 calculates the change in the detection value from an initial value. In the hydrogen sulfide detection device 10 described above, the initial value is a reference potential, and the change in the initial value is the difference between the detection value and the reference potential. Specifically, when the reference potential is set to 0V, the change in the initial value is consistent with the detection value. Next, in step S130, the monitoring circuit 100 determines whether the calculated change is greater than a threshold. If the change is below the threshold (step S130; No), the monitoring circuit 100 considers that no hydrogen sulfide has been generated and terminates the current process. If the change is greater than the threshold (step S130; Yes), the monitoring circuit 100 determines that hydrogen sulfide has been generated from the battery cell (step S140). The monitoring circuit 100 can also perform a process of warning a user (e.g., the driver of a vehicle) about the generation of hydrogen sulfide through a display or sound.

[0033] Figure 2 The illustrated processing flow is one example; the monitoring circuit 100 can also determine that hydrogen sulfide has been generated from the battery cell through other processing flows. For example, as described above, the monitoring circuit 100 can also determine that hydrogen sulfide has been generated from the battery cell directly using the detection value without calculating the change in the detection value. In this case, Figure 2 In the processing flow shown, step S120 is skipped. Furthermore, in step S130, it is determined whether the detected value is greater than a threshold. If the detected value is greater than the threshold, the monitoring circuit 100 determines that hydrogen sulfide has been generated from the battery cell.

[0034] As explained above, the hydrogen sulfide detection device 10 of the first embodiment can detect the generation of hydrogen sulfide by detecting the corrosion of the metal in the detection section 500. On the other hand, in the hydrogen sulfide detection device 10, particles generated by the corroded metal may scatter. Since the corroded metal is conductive, if these particles scatter within the battery pack, they may cause short circuits and malfunctions in the devices within the battery pack. This situation is particularly concerning in environments where the hydrogen sulfide detection device 10 is used, such as in vehicle batteries, where vibrations and shocks are easily transmitted.

[0035] Therefore, in the hydrogen sulfide detection device 10 of the first embodiment, as Figure 1 As shown, the detection section 500 of the substrate 200 is covered by a filter 600. The filter 600 is configured to allow hydrogen sulfide gas to pass through but not particles generated by the corroded metal (sulfides). Typically, the size of hydrogen sulfide gas molecules is sufficiently smaller than the size of particles generated by the corroded metal. Therefore, for example, the filter 600 can be formed from a filter material having a pore size larger than the size of hydrogen sulfide gas molecules and smaller than the size of particles generated by the corroded metal.

[0036] exist Figure 1 In the example shown, such as Figure 1 As shown in part (B), the filter 600 has: a cover portion 610 covering the detection section 500, and a sealing portion 620 that is adhered to the surface of the substrate 200 and seals the space 700 covered by the cover portion 610. Furthermore, in Figure 1 In the example shown, the cover 610 has a surface 611 (hereinafter referred to as the first surface 611) that extends obliquely from the end of the sealing portion 620 toward the inside of the space 700, and a surface 612 (hereinafter referred to as the second surface 612) that is opposite to the detection portion 500 and parallel to the surface of the substrate 200.

[0037] Thus, the detection section 500 is covered by the filter 600, thereby suppressing the dispersion of particles generated by corroded metal. The function of the filter 600 will be explained in more detail below.

[0038] 1.2 Functions of the Filter

[0039] Figure 3 This is a schematic diagram illustrating the function of the filter 600 in the detection unit 500 covering the substrate 200. As described above, the filter 600 is configured to allow hydrogen sulfide gas to pass through while preventing particles 510 generated by corroded metal from passing through. Therefore, as... Figure 3As shown in section (A), hydrogen sulfide gas generated from the battery cell flows into the space 700 through the filter 600. Furthermore, the metal of the detection unit 500 corrodes due to the hydrogen sulfide flowing into the space 700. Thus, the hydrogen sulfide detection device 10 can detect the generation of hydrogen sulfide. On the other hand, the filter 600 prevents particles 510 generated by the corroded metal from passing through. Therefore, the particles 510 generated by the corroded metal remain in the space 700. In this way, the filter 600 can suppress the dispersion of particles 510 generated by the corroded metal within the battery pack.

[0040] Furthermore, according to the first embodiment, the cover portion 610 has a first surface 611 and a second surface 612. By having the first surface 611 and the second surface 612 in this way, the cover portion 610... Figure 3 As shown in part (B), most of the particles 510 generated by the corroded metal can be concentrated at the end of the sealing part 620. This suppresses the particles 510 remaining in the space 700 from obstructing the flow of hydrogen sulfide gas. Consequently, the detection accuracy of the hydrogen sulfide detection device 10 can be prevented from decreasing due to the particles 510 remaining in the space 700.

[0041] 1.3 Effects

[0042] As explained above, the hydrogen sulfide detection device 10 of the first embodiment can detect hydrogen sulfide generation from the battery cell via the detection section 500 of the substrate 200. Specifically, according to the first embodiment, the detection section 500 of the substrate 200 is covered by a filter 600 that is configured to allow hydrogen sulfide gas to pass through while preventing particles 510 generated from corroded metal from passing through. This maintains the detection function of the hydrogen sulfide detection device 10 and suppresses the dispersion of particles 510 from corroded metal.

[0043] 1.4 Variations

[0044] The hydrogen sulfide detection device 10 of the first embodiment can be modified in various ways. Hereinafter, examples of modifications of the hydrogen sulfide detection device 10 of the first embodiment will be described.

[0045] 1.4.1 First Variation

[0046] In the first modified example, the substrate 200 is configured to have a recess in the space 700 covered by the cover portion 610 of the filter 600. Figure 4 This is a schematic diagram illustrating one example of the first variation. In Figure 4 In the example shown, the substrate 200 has two recesses 230 within the space 700. The recesses 230 are, for example, grooves formed on the surface of the substrate 200.

[0047] According to the first modified example, the substrate 200 has a recess 230 in the space 700, which allows the particles 510 of the corroded metal to accumulate and remain in the recess 230. This further suppresses the obstruction of the hydrogen sulfide gas flow by the particles 510. As a result, the reduction in detection accuracy of the hydrogen sulfide detection device 10 due to the particles 510 can be further suppressed.

[0048] Furthermore, in Figure 4 In the example shown, the recess 230 has an inclined surface 231. This allows corroded metal particles 510 to easily accumulate due to the recess 230. Alternatively, the substrate 200 may be configured such that the entire portion of the space 700 except for the detection section 500 is a recess 230. Or, the substrate 200 may be configured such that the recess 230 is located adjacent to the end of the sealing section 620 of the filter 600. By providing the recess 230 in this way, particles 510 can also easily accumulate through the recess 230. As a result, the detection accuracy of the hydrogen sulfide detection device 10 can be further suppressed from decreasing due to particles 510.

[0049] 1.4.2 Second Variation Example

[0050] In the second variation, the filter 600 is configured to cover the entire substrate 200. Figure 5 This is a schematic diagram illustrating one example of the second variation. Figure 5 Part (A) in the diagram represents the overall structure of the hydrogen sulfide detection device 10 of the second modification, and part (B) represents a cross-sectional view along the cut line A-A' shown in part (A). Figure 5 In the example shown, the entire substrate 200 is covered by the filter 600.

[0051] In the second modification, the shape of the filter 600 differs from that of the first embodiment described above. However, in the second modification, the detection section 500 of the substrate 200 is also covered by the filter 600. Therefore, in the second modification, the detection function of the hydrogen sulfide detection device 10 can be maintained, and the dispersion of corroded metal particles 510 can be suppressed. Thus, the shape of the filter 600 is not particularly limited as long as it covers the detection section 500 of the substrate 200.

[0052] 2. Second Implementation Method

[0053] The second embodiment will now be described. However, the description will focus on the differences from the first embodiment, and details that are repeated in the first embodiment will be omitted.

[0054] 2.1 Structure

[0055] Figure 6This is a schematic diagram showing the structure of the hydrogen sulfide detection device 10 according to the second embodiment. Figure 6 Part (A) in the text represents the overall structure of the hydrogen sulfide detection device 10 of the second embodiment. Figure 6 Part (B) in the diagram represents a cross-sectional view of the cut line B-B' shown in part (A).

[0056] The hydrogen sulfide detection device 10 of the second embodiment includes a monitoring circuit 100 and a substrate 200, similar to those of the first embodiment. Furthermore, the monitoring circuit 100 and the substrate 200 are connected via a cable 300. However, in the second embodiment, the pattern 220 of the substrate 200 and the structure of the detection section 500 differ from those of the first embodiment.

[0057] In the second embodiment, the detection unit 500 includes a first metal portion 501 and a second metal portion 502. The first metal portion 501 and the second metal portion 502 are formed by metal exposed on the surface of the substrate 200. Specifically, the first metal portion 501 and the second metal portion 502 are formed by vias or through holes. The inner wall surface of the circular vias or through holes is plated with the same metal as pattern 220.

[0058] The first metal part 501 is connected to the first node 401 and the second metal part 502 is connected to the second node 402 via wiring formed by cable 300 and pattern 220. Additionally, the first metal part 501 is connected to the second node 402 via a resistor element 221. The resistor element 221 is, for example, a chip component with a resistance value of approximately 10kΩ. Furthermore, as... Figure 6 As shown, the first metal portion 501 and the second metal portion 502 are arranged adjacent to each other with a gap between them. In particular, through surface protection or the like implemented on the substrate 200, the first metal portion 501 and the second metal portion 502 are electrically insulated. That is, the first metal portion 501 and the second metal portion 502 are in a non-conductive state. The hydrogen sulfide detection device 10 of the second embodiment can detect the generation of hydrogen sulfide by means of the detection unit 500 including such a first metal portion 501 and a second metal portion 502, as described below.

[0059] Under normal conditions, i.e., when no hydrogen sulfide is generated from the battery cell, as described above, the first metal part 501 and the second metal part 502 are in a non-conductive state. Therefore, the monitoring and processing unit 130 obtains the voltage Vcc of the power supply as a detection value. Under abnormal conditions, i.e., when hydrogen sulfide is generated from the battery cell, the metals of the first metal part 501 and the second metal part 502 react with the generated hydrogen sulfide and are corroded. Thus, since the corroded metal (sulfide) expands radially, the first metal part 501 and the second metal part 502 are connected by the sulfide. Since the sulfide is conductive, the first metal part 501 and the second metal part 502 become conductive. At this time, the monitoring and processing unit 130 obtains the voltage division based on the resistance value between the first node 401 and the second node 402 as a detection value. Here, the first metal part 501 and the second metal part 502 are adjacent to each other, and the resistance value of the sulfide connecting the first metal part 501 and the second metal part 502 is small relative to the resistance 120. Therefore, when the first metal part 501 and the second metal part 502 are in a conductive state, the potential of the ground terminal GND is almost directly input to the monitoring and processing unit 130. That is, the monitoring and processing unit 130 obtains the reference potential as the detection value.

[0060] Thus, in the second embodiment, when hydrogen sulfide is generated from the battery cell, the detection state of the detection unit 500 is also manifested as the voltage between the first node 401 and the second node 402. That is, when hydrogen sulfide is generated from the battery cell, the detection value of the monitoring processing unit 130 changes from Vcc to the reference potential. Therefore, the monitoring processing unit 130 can determine whether hydrogen sulfide has been generated from the battery cell based on the change in the detection value (the voltage between the first node 401 and the second node 402). The processing flow performed by the monitoring circuit 100 (more specifically, the monitoring processing unit 130) can be the same as in the first embodiment (see [reference]). Figure 2 As explained above, the hydrogen sulfide detection device 10 of the second embodiment can detect the generation of hydrogen sulfide by the corrosion of the metal in the detection section 500.

[0061] Furthermore, in the hydrogen sulfide detection device 10 of the second embodiment, the detection section 500 of the substrate 200 is also covered by the filter 600. Similar to the first embodiment, the filter 600 is configured to allow hydrogen sulfide gas to pass through but not particles 510 generated by corroded metal. Additionally, the filter 600 has a cover portion 610 and a sealing portion 620, the cover portion 610 having a first surface 611 and a second surface 612.

[0062] 2.2 Effects

[0063] As explained above, the hydrogen sulfide detection device 10 of the second embodiment can detect hydrogen sulfide generation from the battery cell through the detection section 500 of the substrate 200. Furthermore, according to the second embodiment, similarly to the first embodiment, the detection section 500 of the substrate 200 is covered by a filter 600 that is formed to allow hydrogen sulfide gas to pass through but prevent particles 510 generated by corroded metal from passing through. This maintains the detection function of the hydrogen sulfide detection device 10 and suppresses the scattering of particles 510 from corroded metal. Additionally, according to the second embodiment, similarly to the first embodiment, the cover portion 610 of the filter 600 has a first surface 611 and a second surface 612. This allows most of the particles 510 generated by corroded metal to accumulate at the end of the sealing portion 620. As a result, the detection accuracy of the hydrogen sulfide detection device 10 can be prevented from decreasing due to particles 510 remaining in the space 700.

[0064] 2.3 Variation Example

[0065] The modifications (first and second modifications) described in the first embodiment can also be appropriately applied to the hydrogen sulfide detection device 10 of the second embodiment.

[0066] 3 Other

[0067] In the first and second embodiments described above, the structures of the detection unit 500 for detecting hydrogen sulfide differ. However, in both embodiments, the detection unit 500 is covered by a filter 600 that is configured to allow hydrogen sulfide gas to pass through while preventing particles 510 generated from corroded metal from passing through, thereby achieving the same effect. Thus, the technical features of this embodiment can also be appropriately applied to hydrogen sulfide detection devices 10 with detection units 500 having other structures.

Claims

1. A hydrogen sulfide detection device, applied to a battery pack, said battery pack being a battery pack containing battery cells having a sulfide-based electrolyte. The hydrogen sulfide detection device includes a substrate having a pattern formed from a metal that can react with hydrogen sulfide and be corroded. The pattern includes a detection unit that detects hydrogen sulfide by corroding the metal exposed on the surface of the substrate. The detection unit is covered by a filter configured to allow hydrogen sulfide gas to pass through but prevent particles generated by the corroded metal from passing through.

2. The hydrogen sulfide detection device according to claim 1, The filter has: a cover portion that covers the detection part, and a sealing part that is adhered to the surface of the substrate and seals the space covered by the cover portion. The cover has: a surface that extends obliquely from the end of the sealing portion toward the inside of the space, and a surface that is opposite to the detection portion and parallel to the surface of the substrate.

3. The hydrogen sulfide detection device according to claim 1, The substrate has a recess within the space covered by the filter.

4. The hydrogen sulfide detection device according to claim 3, The recess has an inclined surface.

5. The hydrogen sulfide detection device according to any one of claims 1 to 4, It also has a monitoring circuit. The pattern is electrically connected between the first node and the second node. The monitoring circuit determines whether hydrogen sulfide has been generated from the battery cell based on the voltage change between the first node and the second node.

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