Battery system and electrified vehicle

Abstract

The battery system comprises a battery case (90), a battery (10) made of a sulfide-based all-solid-state battery housed in the battery case (90), a first detection unit (71) configured to detect hydrogen sulfide by being positioned on the bottom surface (91a) of the battery case (90) within the battery case (90), a second detection unit (72, 73) configured to detect hydrogen sulfide by being positioned vertically upward from the bottom surface (91a) within the battery case (90), and a control device (150). The control device (150) has an abnormality processing unit configured to perform abnormality processing based on the detection results of the first detection unit (71) and the second detection unit (72, 73). The above abnormality processing unit is configured to perform a first abnormality processing when hydrogen sulfide is detected by the first detection unit (71) alone, and to perform a second abnormality processing when hydrogen sulfide is detected by the second detection unit (72, 73).

Description

Technology Field

[0001] The present disclosure relates to a battery system and an electric vehicle. Background Technology

[0002] Japanese Patent Publication No. 2022-46077 discloses a battery system in which, in a secondary battery using a sulfur-based material in the positive electrode and / or solid electrolyte, the secondary battery is cooled by a cooler when the generation of hydrogen sulfide is predicted or detected.

[0003] In Japanese Patent Publication No. 2022-46077, the generation of hydrogen sulfide gas from a secondary battery is detected by detecting the pressure inside a battery case accommodating the secondary battery or the hydrogen sulfide concentration (sulfur concentration) inside the battery case. The problem to be solved

[0004] In the configuration of Japanese Patent Publication No. 2022-46077, hydrogen sulfide gas generated from a secondary battery cannot be detected until the battery case is filled with hydrogen sulfide gas and the pressure inside the battery case rises or the hydrogen sulfide concentration increases. It is desired to detect the generation of hydrogen sulfide even when the amount of hydrogen sulfide generated from the secondary battery is small.

[0005] The present disclosure provides a battery system capable of detecting the generation of hydrogen sulfide even when the amount of hydrogen sulfide generated from the battery is small. means of solving the problem

[0006] A battery system according to the first embodiment of the present disclosure comprises a battery case, a battery comprising a sulfide-based all-solid-state battery housed in the battery case, a first detection unit configured to detect hydrogen sulfide disposed on the bottom surface of the battery case within the battery case, a second detection unit configured to detect hydrogen sulfide disposed vertically upward from the bottom surface within the battery case, and a control device. The control device comprises an abnormality processing unit configured to perform abnormality processing based on the detection results of the first detection unit and the second detection unit. The abnormality processing unit is configured to perform a first abnormality processing when hydrogen sulfide is detected by the first detection unit alone, and to perform a second abnormality processing when hydrogen sulfide is detected by the second detection unit.

[0007] According to this configuration, the battery is composed of a sulfide-based all-solid-state battery. In the present disclosure, the sulfide-based all-solid-state battery contains a sulfur component in at least one of the positive electrode material or the solid electrolyte material. A first detection unit for detecting hydrogen sulfide is disposed on the bottom surface of the battery case, and a second detection unit for detecting hydrogen sulfide is disposed vertically upward from the bottom surface. An abnormality processing unit of the control device performs abnormality processing based on the detection results of the first detection unit and the second detection unit. The abnormality processing unit performs a first abnormality processing when hydrogen sulfide is detected by the first detection unit alone. The abnormality processing unit performs a second abnormality processing when hydrogen sulfide is detected by the second detection unit.

[0008] When the sulfur component contained in a sulfide-based all-solid-state battery reacts with moisture, hydrogen sulfide may be generated. Since hydrogen sulfide is heavier than air, it remains on the bottom side of the battery case. Since the first detection unit is positioned on the bottom side of the battery case, it can detect hydrogen sulfide remaining on the bottom side of the battery case even if the amount of hydrogen sulfide generated from the battery is small. Accordingly, the abnormality detection unit can perform a first abnormality treatment when hydrogen sulfide is detected solely by the first detection unit. The first abnormality treatment may be an abnormality treatment mode for cases where the generated hydrogen sulfide is small.

[0009] When a large amount of hydrogen sulfide is generated from the battery, the battery case becomes filled with hydrogen sulfide. When the battery case is filled with hydrogen sulfide, the hydrogen sulfide is detected by a second detection unit positioned vertically upward from the bottom surface. Accordingly, the abnormality detection unit can perform a second abnormality processing when hydrogen sulfide is detected by the second detection unit. The second abnormality processing may be an abnormality processing mode for cases where a large amount of hydrogen sulfide is generated.

[0010] In a battery system according to the first embodiment of the present disclosure, the abnormality processing unit may be configured to perform a second abnormality processing when hydrogen sulfide is detected in the first detection unit and the second detection unit.

[0011] According to this configuration, it is possible to detect more reliably that the battery case is filled with hydrogen sulfide.

[0012] A battery system according to the first embodiment of the present disclosure may further comprise a communication channel configured to communicate the inside and outside of a battery case, and a second detection unit may be disposed within the communication channel.

[0013] According to this configuration, a second detection unit positioned vertically above the bottom surface of the battery case may be positioned inside a communication channel that connects the inside and outside of the battery case. Hydrogen sulfide generated from the battery may be discharged to the outside through the communication channel when it fills the battery case. Since the second detection unit may detect hydrogen sulfide discharged to the outside through the communication channel, it is possible to reliably detect that the battery case is filled with hydrogen sulfide.

[0014] A battery system according to the first embodiment of the present disclosure may further include a communication channel configured to communicate the inside and outside of a battery case, and a desulfurizing agent configured to adsorb hydrogen sulfide provided within the communication channel.

[0015] According to this configuration, when air containing hydrogen sulfide inside the battery case is discharged to the outside through the flue, the hydrogen sulfide is purified (adsorbed) by the desulfurizing agent. This prevents the release of hydrogen sulfide into the outside air.

[0016] In a battery system according to the first embodiment of the present disclosure, an opening and closing valve may be provided in the communication passage, and the second or more processing may include opening the opening and closing valve and communicating the inside and outside of the battery case through the communication passage.

[0017] According to this configuration, if a large amount of hydrogen sulfide is generated and a second or subsequent treatment is performed, the opening and closing valve provided in the flue may be opened. As a result, when air containing hydrogen sulfide inside the battery case is discharged to the outside through the flue, the hydrogen sulfide is purified (adsorbed) by the desulfurizing agent, thereby suppressing the release of hydrogen sulfide into the outside air.

[0018] A battery system according to the first embodiment of the present disclosure may further comprise an auxiliary communication channel that is in constant communication with the inside and outside of a battery case.

[0019] According to this configuration, the increase in internal pressure of the battery case can be suppressed by the auxiliary passage.

[0020] In a battery system according to the first embodiment of the present disclosure, the battery case may be mounted on an electric vehicle, and the battery may be a power source for the electric vehicle, and the first abnormal processing may be an abnormal driving processing that performs an abnormal driving of the electric vehicle, and the second abnormal processing may be a system stop processing that performs a driving stop of the electric vehicle.

[0021] According to this configuration, when the amount of hydrogen sulfide generated from the battery is low, a retreat driving process may be performed by the first treatment to perform retreat driving of the electric vehicle. In the present disclosure, the retreat driving may be capable of limiting the driving force or vehicle speed but enabling driving to a repair shop or a predetermined retreat location, or enabling driving within a predetermined distance or within a predetermined time.

[0022] In cases where a large amount of hydrogen sulfide is generated from the battery, a system stop process that stops the driving of the electric vehicle may be executed by a second or more treatment. In the present disclosure, the system stop process may be to immediately reduce the driving force of the electric vehicle to zero, thereby making the driving of the electric vehicle impossible. When executing the system stop process, the driving force may be generated for a short period of time so that the electric vehicle does not stop on the road.

[0023] In a battery system according to the first embodiment of the present disclosure, the second or more processing may include a notification processing that performs a notification toward the outside of the electric vehicle.

[0024] According to this configuration, it is possible to alert the surroundings of the electric vehicle that there is a large amount of hydrogen sulfide generated from the battery.

[0025] In a battery system according to the first embodiment of the present disclosure, the battery may be a laminated all-solid-state battery having a laminate film as an outer member.

[0026] In a laminated all-solid-state battery, there is a risk that the seal may easily come undone at the sealing points of the laminate film, particularly at the positive and negative terminals. If the coming of the seal is referred to as "seal out," air enters the interior of the all-solid-state battery through the seal-out area. If the intruded air contains moisture, the sulfur component of the all-solid-state battery may react with the moisture to generate hydrogen sulfide. Even if the generated hydrogen sulfide is gradually discharged from the seal-out area, the generation of hydrogen sulfide can be detected by the first detection unit.

[0027] An electric vehicle according to the second embodiment of the present disclosure may have a battery system according to the first embodiment of the present disclosure. A battery case may be mounted on the electric vehicle, and the battery may be a power source for the electric vehicle. The first abnormal processing may be a back-run processing that performs back-run of the electric vehicle. The second abnormal processing may be a system stop processing that performs a stop of operation of the electric vehicle.

[0028] According to the present disclosure, the generation of hydrogen sulfide can be detected even when the amount of hydrogen sulfide generated from the battery is small. Brief explanation of the drawing

[0029] The features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, wherein similar reference numerals in the drawings indicate similar elements, and where: FIG. 1 is a schematic diagram showing the overall configuration of an electric vehicle equipped with a battery system according to the present embodiment. Figure 2 is a drawing showing a perspective view of a battery. Figure 3 is a diagram showing the schematic configuration of a battery. Figure 4a is a diagram illustrating the schematic configuration of a single cell. Figure 4b is a diagram illustrating the schematic configuration of a single cell. Figure 5a is a diagram illustrating a stacking method of single cells. Figure 5b is a diagram illustrating a stacking method of single cells. Figure 6 is a flowchart illustrating an example of abnormal processing control executed by the ECU. FIG. 7 is a flowchart illustrating an example of abnormal processing control executed by the ECU in Variant Example 1. FIG. 8 is a diagram showing the schematic configuration of the battery in Variant Example 2. Specific details for implementing the invention

[0030] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In addition, identical or substantial parts in the drawings are denoted by the same reference numerals, and their descriptions are not repeated.

[0031] FIG. 1 is a schematic diagram showing the overall configuration of an electric vehicle (100) equipped with a battery system according to an embodiment of the present disclosure. The electric vehicle (100) is equipped with a battery storage device (200) for storing power for driving. The electric vehicle (100) is configured to be able to drive using the power stored in the battery storage device (200). In the present embodiment, the electric vehicle (100) is an electric vehicle (BEV) that does not have an engine (internal combustion engine), but may be a hybrid vehicle (HEV) or a plug-in hybrid vehicle (PHEV) that has an engine.

[0032] An electric vehicle (100) is equipped with an Electronic Control Unit (ECU) (150). The ECU (150) is configured to perform charging and discharging control of a storage device (200). The ECU (150) is configured to include a processor (151), a Random Access Memory (RAM) (152), and a memory device (153). The ECU (150) may be a computer. The processor (151) may be a Central Processing Unit (CPU). The RAM (152) functions as a working memory that temporarily stores data processed by the processor (151). The memory device (153) is configured to store stored information. In addition to the program, information used in the program (e.g., maps, formulas, and various parameters) is stored in the memory device (153). By executing the program stored in the memory device (153) by the processor (151), various controls in the ECU (150) are executed. Additionally, the ECU (150) performs abnormal processing control as described below. In this embodiment, the battery system is composed of a storage device (200) and an ECU (150).

[0033] The monitoring module (130) includes various sensors that detect the state of the energy storage device (200) (e.g., voltage, current, and temperature) and outputs the detection results to the ECU (150). In addition to the sensor functions, the monitoring module (130) may be a Battery Management System (BMS) that further includes a State of Charge (SOC) estimation function, a State of Health (SOH) estimation function, a cell voltage equalization function, a diagnostic function, and a communication function. The ECU (150) can acquire the state of the energy storage device (200) (e.g., temperature, current, voltage, SOC, and internal resistance) based on the output of the monitoring module (130). Additionally, the energy storage device (200) is charged (externally charged) by power supplied from a charging facility.

[0034] The electric vehicle (100) further comprises a driving drive unit (110), an HMI (Human Machine Interface) device (120), a hazard lamp (140), an external indicator (160), and a driving wheel (W). The driving drive unit (110) includes a PCU (Power Control Unit) and an MG (Motor Generator) not shown, and is configured to drive the electric vehicle (100) using power accumulated in a battery storage device (200). The PCU is configured to include, for example, an inverter, a converter, and a relay (hereinafter referred to as "SMR (System Main Relay)"). The PCU is controlled by an ECU (150). The MG is, for example, a three-phase AC motor generator. The MG is driven by the PCU and is configured to rotate the driving wheel (W). The PCU drives the MG using power supplied from the battery storage device (200). Additionally, the MG is configured to perform regenerative power generation and supply the generated power to the energy storage device (200). The SMR is configured to switch the connection / disconnection of the power path from the energy storage device (200) to the PCU. The SMR becomes closed (connected) when the electric vehicle (100) is in operation.

[0035] The HMI device (120) includes an input device and a display device. The HMI device (120) may include a touch panel display. The hazard lamp (140) is a lamp positioned on the front, rear, left, and right sides of the electric vehicle (100), is the same as a turn signal, and functions as an emergency flashing indicator. The external indicator (160) is, for example, an LED indicator, is provided on the rear window, and the display content can be seen from the outside of the electric vehicle (100).

[0036] FIG. 2 is a drawing showing a perspective view of a battery storage device (200). The battery storage device (200) includes a battery case (90) and a battery module (50) housed in the battery case (90). The battery case (90) is composed of a lower case (91) and an upper case (92). In this embodiment, two battery modules (50) are housed in the space formed by the lower case (91) and the upper case (92). A breathing membrane (61) is provided in the upper case (92). The breathing membrane (61) will be described later. The battery storage device (200) may be mounted on the floor of an electric vehicle (100), may be mounted inside the passenger compartment of the electric vehicle (100), or may be mounted outside the passenger compartment of the electric vehicle (100).

[0037] FIG. 3 is a diagram showing the schematic configuration of a storage device (200). FIG. 3 is a cross-section along line III-III in FIG. 2. The battery module (50) is a battery that connects a plurality of single cells (10). The plurality of single cells (10) are stacked between a pair of end plates (31, 32).

[0038] FIGS. 4a and 4b are drawings illustrating the schematic configuration of a single cell (10) in the present embodiment. FIG. 4a is a drawing viewed from the top surface of the single cell (10). The single cell (10) is a laminated all-solid-state battery using a laminate film as an outer casing member (20), and a negative terminal (negative tab) (1a) and a positive terminal (positive tab) (5a) protrude from the outer casing member (20). The laminate film may be, for example, a pouch made of aluminum laminate film, or a film with a three-layer structure in which an aluminum foil is sandwiched between resin films.

[0039] FIG. 4b shows an all-solid-state battery stack (15) housed in an outer member (20), and shows a cross-section IVB-IVB of FIG. 4a. The all-solid-state battery stack (15) is a solid-state battery element (8) in which a negative electrode current collector layer (1), a negative electrode active material layer (2), a solid electrolyte layer (3), a positive electrode active material layer (4), and a positive electrode current collector layer (5) are stacked in this order, and three such elements are stacked in reverse order, sharing the negative electrode current collector layer (1) and the positive electrode current collector layer (5). The negative electrode current collector layer (1) is connected to the negative electrode terminal (1a), and the positive electrode current collector layer (5) is connected to the positive electrode terminal (5a). Additionally, the number of all-solid-state battery elements (8) included in the all-solid-state battery stack (15) may be one or four or more. The insulating film (7) insulates the solid-state battery laminate (15) and the outer member (laminate film) (20).

[0040] The single cell (10) is a sulfide-based all-solid-state battery. In the present disclosure, the sulfide-based all-solid-state battery contains a sulfur component in at least one of the material of the positive electrode active material layer (4) or the material of the solid electrolyte layer (3). In the present embodiment, the solid electrolyte layer (3) comprises a sulfide-based solid electrolyte, and for example, the sulfide-based solid electrolyte may be made from phosphorus pentasulfide (P2S5) or lithium sulfide (Li2S) as a starting material. In this case, the positive electrode active material layer (4) may include, for example, lithium cobaltate, lithium nickelate, lithium iron phosphate, etc. When the solid electrolyte layer (3) is composed of an oxide-based solid electrolyte, a sulfur-based positive electrode active material is used for the positive electrode active material layer (4). As the sulfur-based positive electrode active material, it may be an organic sulfur compound or an inorganic sulfur compound. Additionally, both the solid electrolyte layer (3) and the positive electrode active material layer (4) may contain a sulfur component.

[0041] Referring to FIG. 3, a plurality of single cells (10) are arranged between a pair of end plates (31, 32) and stacked. FIGS. 5a and 5b are drawings illustrating a method of stacking single cells (10). The single cells (10) are flat in shape and may be stacked such that the outer members (20) of the single cells (10) come into contact, as shown in FIG. 5a. Additionally, a plurality of single cells (10) may be stacked by interposing a flat spacer (not shown) between the single cells (10). Furthermore, as shown in FIG. 5b, a pair of frame pairs (21, 22) having inner surfaces corresponding to the outer shape of the single cells (10) may be used to cover the single cells (10), and the single cells (10) covered by the pair of frame pairs (21, 22) may be stacked.

[0042] Returning to FIG. 3, a plurality of single cells (10) are sandwiched between a pair of end plates (31, 32) in a stacked state, and a predetermined restraining load is applied by a restraining band, etc., not shown. The pair of end plates (31, 32) are fixed to the base plate (30) by brackets (41, 42).

[0043] A battery module (50), comprising a single cell (10), a base plate (30), etc., stacked between a pair of end plates (31, 32), is fixed to the bottom surface (91a) of a lower case (91). The battery case (90) is a casing (housing) that accommodates the battery module (50).

[0044] A duct (60) is provided in the upper case (92). The duct (60) is a passage connecting the inside and outside of the battery case (90), and when the internal pressure of the battery case (90) increases, it discharges the air inside the battery case (90) to the outside, and when the internal pressure of the battery case (90) decreases, it introduces outside air (external air). The duct (60) is installed in an opening formed in the ceiling surface (92a) of the upper case (92).

[0045] At the end of the duct (60), a breathing membrane (61, 62) made of an air-permeable waterproof (moisture-permeable waterproof) sheet is provided. The air-permeable waterproof (moisture-permeable waterproof) sheet may be, for example, GORE-TEX (registered trademark). A desulfurizing agent (63) is placed inside the duct (60). The desulfurizing agent (63) may be, for example, a pellet-shaped desulfurizing agent with iron oxide as the main component, and chemically adsorbs hydrogen sulfide. When the internal pressure of the battery case (90) increases, the air inside the battery case (90) is discharged to the outside through the duct (60), as indicated by the arrow of the dotted line. At this time, the hydrogen sulfide contained in the air is chemically adsorbed by the desulfurizing agent (63), and the hydrogen sulfide is purified. In this way, the duct (60) functions as a desulfurization unit.

[0046] A plurality of hydrogen sulfide sensors are disposed inside the battery case (90). The hydrogen sulfide sensor is a sensor that detects the concentration of hydrogen sulfide (H2S) contained in the atmosphere and outputs a signal indicating the detection result to the ECU (150). The hydrogen sulfide sensor may be, for example, a thermal wire type semiconductor sensor or a potential electrolytic sensor. In this embodiment, a first hydrogen sulfide sensor (71) disposed on the bottom surface of the battery case (90), a second hydrogen sulfide sensor (72) disposed on the top surface of the battery case (90), and a third hydrogen sulfide sensor (73) disposed inside the duct (60) are provided.

[0047] A first hydrogen sulfide sensor (71) is provided on the bottom surface (91a) of the lower case (91) and is provided in multiple numbers around the battery module (50). There may be only one first hydrogen sulfide sensor (71). A second hydrogen sulfide sensor (72) is provided in multiple numbers on the ceiling surface (92a) of the upper case (92). There may be only one second hydrogen sulfide sensor (72). A third hydrogen sulfide sensor (73) is provided inside the duct (60) and is located on the inner side of the battery case (90) above the desulfurizing agent (63). The second hydrogen sulfide sensor (72) and the third hydrogen sulfide sensor (73) are positioned above (vertically upward) the first hydrogen sulfide sensor (71). Assuming that the bottom surface (91a) of the lower case (91) is positioned along the horizontal direction, the upper direction is expressed as the vertical direction upward. The first hydrogen sulfide sensor (71) corresponds to an example of the “first detection unit” of the present disclosure, and the second hydrogen sulfide sensor (72) and the third hydrogen sulfide sensor (73) correspond to an example of the “second detection unit” of the present disclosure.

[0048] The single cell (10) of the present embodiment is a laminated all-solid-state battery, and there is a risk that the seal may easily come undone at the sealing points of the outer casing member (20) (laminate film), particularly at the negative electrode terminal (1a) and the positive electrode terminal (5a). If the opening of the seal is referred to as "seal-out," air enters through the seal-out area. If the intruded air contains moisture, the moisture reacts with the sulfur component contained in the solid electrolyte layer (3) or the positive electrode active material layer (4), generating hydrogen sulfide. The amount of hydrogen sulfide generated by seal-out is generally small. Furthermore, if the single cell (10) is exposed to a high temperature, and for some reason the sulfur component contained in the solid electrolyte layer (3) or the positive electrode active material layer (4) reacts with moisture, a large amount of hydrogen sulfide is generated.

[0049] In this embodiment, based on detection signals from a plurality of hydrogen sulfide sensors placed within the battery case (90), the generation of a small amount of hydrogen sulfide, such as seal out, and the generation of a large amount of hydrogen sulfide at high temperatures are detected, and abnormality processing is performed. FIG. 6 is a flowchart showing an example of abnormality processing control executed by the ECU (150). This flowchart is repeatedly processed at predetermined intervals by the abnormality processing unit, which is a functional block configured in the ECU (150).

[0050] In step 10 (hereinafter, the step is abbreviated as "S"), it is determined whether hydrogen sulfide is detected by the first hydrogen sulfide sensor (71). The first, second, and third hydrogen sulfide sensors (71, 72, 73) output a signal indicating the concentration of hydrogen sulfide to the ECU (150). The ECU (150) (anomaly processing unit) determines the concentration of hydrogen sulfide from the received detection signal, and determines that hydrogen sulfide is detected when the determined concentration exceeds a threshold value. Since hydrogen sulfide is not normally present in the battery case (90), the threshold value may be the lower limit value of the detection level of the hydrogen sulfide sensor. Additionally, when setting the threshold value, the rise in the baseline of the detection level of the hydrogen sulfide sensor due to unwanted gases other than hydrogen sulfide (H2S) may be taken into account.

[0051] If hydrogen sulfide is detected by at least one of the plurality of first hydrogen sulfide sensors (71), it is determined positively and proceeds to S11. If hydrogen sulfide is not detected by any of the first hydrogen sulfide sensors (71), it is determined negatively and the current routine is terminated.

[0052] In S11, it is determined whether hydrogen sulfide is detected by the second hydrogen sulfide sensor (72) or the third hydrogen sulfide sensor (73). When hydrogen sulfide is not detected by all of the second hydrogen sulfide sensors (72) and the third hydrogen sulfide sensor (73), it is determined negatively and proceeds to S12. When hydrogen sulfide is detected by at least one of the multiple second hydrogen sulfide sensors (72), or when hydrogen sulfide is detected by the third hydrogen sulfide sensor (73), it is determined positively and proceeds to S13.

[0053] When a positive judgment is made in S10 and a negative judgment is made in S11, hydrogen sulfide is detected only by the first hydrogen sulfide sensor (71) placed on the bottom surface of the battery case (90), and it can be determined that hydrogen sulfide is generated due to seal out. Therefore, in S12, a retreat driving process is performed. In this embodiment, the retreat driving process limits the MG output of the driving drive unit (110). This causes a hindrance to normal driving of the electric vehicle (100), but driving to a repair shop or a designated retreat location (e.g., a storage location (parking lot) for the electric vehicle (100)) is possible. The retreat driving process may be a control that enables driving within a predetermined distance or within a predetermined time from the time S12 is first processed, and prevents driving when the predetermined distance or predetermined time is exceeded. Additionally, the HMI device (120) displays the intent that there is a “battery abnormal condition” and that “delivery to a repair shop” is required. When S12 is processed, the current routine is terminated.

[0054] When a positive judgment is made at S10 and also at S11, a large amount of hydrogen sulfide is generated and the inside of the battery case (90) is filled with hydrogen sulfide, and hydrogen sulfide is detected by the second hydrogen sulfide sensor (72) or the third hydrogen sulfide sensor (73). Therefore, at S13, a system stop process is performed. In this embodiment, the system stop process is performed by opening the SMR (cutting state) and cutting off the power path from the storage device (200) to the PCU. As a result, if the electric vehicle (100) is in motion, the electric vehicle (100) is stopped. Additionally, the system stop process causes the hazard lamp (140) to flash and displays a warning (hydrogen sulfide) on the external indicator (160). The HMI device (120) displays a warning that the system has stopped and requests to stop on the shoulder. Additionally, after displaying "system stop processing" and "parking on the shoulder" on the HMI device (120), the blocking of the SMR may be delayed for a short period during which the electric vehicle (100) in motion can be stopped on the shoulder, so that the electric vehicle (100) does not stop on the road. When S13 is processed, the current routine is terminated.

[0055] Since hydrogen sulfide is heavier than air, it remains on the bottom side of the battery case (90). According to this embodiment, since the first hydrogen sulfide sensor (71) is positioned on the bottom side of the battery case (90), hydrogen sulfide remaining on the bottom side of the battery case (90) can be detected even when the amount of hydrogen sulfide generated from the single cell (10) is small. Furthermore, when the amount of hydrogen sulfide generated from the single cell (10) is large, hydrogen sulfide fills the battery case (90). When hydrogen sulfide fills the battery case (90), hydrogen sulfide is detected by the second hydrogen sulfide sensor (72) or the third hydrogen sulfide sensor (73) positioned vertically above the bottom side of the battery case (90).

[0056] According to the present embodiment, when the hydrogen sulfide generated from the single cell (10) is small and hydrogen sulfide is detected by the first hydrogen sulfide sensor (71) alone, a retreat driving process is executed. The retreat driving process corresponds to an example of the "first abnormality treatment" of the present disclosure. According to the present embodiment, when the hydrogen sulfide generated from the single cell (10) is large and hydrogen sulfide is detected by the second hydrogen sulfide sensor (72) or the third hydrogen sulfide sensor (73), a system stop process is executed. The system stop process corresponds to an example of the "second abnormality treatment" of the present disclosure. When the hydrogen sulfide generated from the single cell (10) is small, retreat driving is enabled, and when the hydrogen sulfide generated from the single cell (10) is large, the electric vehicle (100) is stopped immediately, so appropriate treatment can be performed according to the amount of hydrogen sulfide generated from the single cell (10).

[0057] In the above embodiment, in S11, in addition to the second hydrogen sulfide sensor (72), the third hydrogen sulfide sensor (73) was used to determine whether hydrogen sulfide was detected. However, the third hydrogen sulfide sensor (73) placed in the duct (60) may be omitted, and the second hydrogen sulfide sensor (72) may be used to determine whether hydrogen sulfide was detected.

[0058] In the above embodiment, in S11, in addition to the third hydrogen sulfide sensor (73), the second hydrogen sulfide sensor (72) was used to determine whether hydrogen sulfide was detected. However, the second hydrogen sulfide sensor (72) may be omitted, and the third hydrogen sulfide sensor (73) placed in the duct (60) may be used to determine whether hydrogen sulfide was detected.

[0059] In the above embodiment, an example has been described in which a battery system (energy storage device (200) and ECU (150)) is mounted on an electric vehicle (100). The battery system may be a stationary energy storage device. In this case, in S12, the charging and discharging power of the energy storage device (200) may be limited (first abnormal processing), and in S13, the charging and discharging of the energy storage device (200) may be stopped and an alarm sound may be emitted externally.

[0060] In the above embodiment, a first hydrogen sulfide sensor (71) is placed on the bottom surface of the battery case (90), and a second hydrogen sulfide sensor (72) is placed on the top surface of the battery case (90). However, a first sampling passage opened on the bottom surface of the battery case (90) and a second sampling passage opened on the top surface of the battery case (90) may be provided, and the first and second sampling passages may be connected to the hydrogen sulfide sensors. Hydrogen sulfide on the bottom surface of the battery case (90) can be detected from the gas (air) introduced to the hydrogen sulfide sensor through the first sampling passage, and hydrogen sulfide filling the battery case (90) can be detected from the gas introduced to the hydrogen sulfide sensor through the second sampling passage. In this case, the first sampling passage opened on the bottom surface of the battery case (90) corresponds to the “first detection part” of the present disclosure, and the second sampling passage opened on the top surface of the battery case (90) corresponds to the “second detection part” of the present disclosure.

[0061] (Variation Example 1)

[0062] FIG. 7 is a flowchart showing an example of an abnormality processing control executed by the ECU (150) in Variant Example 1. This flowchart is processed repeatedly at predetermined intervals by the abnormality processing unit, which is a functional block configured in the ECU (150), and S14 is added to the flowchart of the above embodiment.

[0063] S14 is processed when a negative determination is made in S10. In S14, it is determined whether hydrogen sulfide is detected by the second hydrogen sulfide sensor (72) or the third hydrogen sulfide sensor (73). When hydrogen sulfide is not detected by all of the second hydrogen sulfide sensors (72) and the third hydrogen sulfide sensor (73), a negative determination is made, and the current routine is terminated. When hydrogen sulfide is detected by at least one of the multiple second hydrogen sulfide sensors (72), or when hydrogen sulfide is detected by the third hydrogen sulfide sensor (73), a positive determination is made, and the process proceeds to S13.

[0064] According to this variant example 1, even if hydrogen sulfide cannot be detected by the first hydrogen sulfide sensor (71) due to any error, etc., if there is a large amount of hydrogen sulfide generated from the single cell (10) and hydrogen sulfide fills the battery case (90), system shutdown processing (second abnormal processing) can be performed.

[0065] (Variation Example 2)

[0066] FIG. 8 is a diagram showing the schematic configuration of a storage device (200a) in Variant Example 2. The storage device (200a) differs from the storage device (200) of the above embodiment in that it is equipped with an electronic shut-off valve (65) and a sub-duct (80).

[0067] The electronic shut-off valve (65) performs communication / blocking of the duct (60) and is an electronic valve that is normally closed. When the electronic shut-off valve (65) receives an open signal from the ECU (150), it opens the valve.

[0068] The auxiliary duct (80) is a passage connecting the inside and outside of the battery case (90), and when the internal pressure of the battery case (90) increases, it discharges the air inside the battery case (90) to the outside, and when the internal pressure of the battery case (90) decreases, it introduces outside air (external air). The auxiliary duct (80) is installed in an opening formed on the side of the lower case (91).

[0069] At the end of the auxiliary duct (80), a breathing membrane (81, 82) made of an air-permeable waterproof (moisture-permeable waterproof) sheet is provided, and inside the auxiliary duct (80), a pellet-shaped desulfurizing agent (63) is arranged. The auxiliary duct (80) is a passage that constantly communicates the inside and outside of the battery case (90) and corresponds to the “auxiliary passage” of the present disclosure.

[0070] In this variant 2 as well, the abnormal processing control of FIG. 6 is executed by the ECU (150) in the same manner as in the above embodiment. In variant 2, during the system shutdown process of S13, an opening signal is output to the electronic shut-off valve (65), and the electronic shut-off valve (65) is opened. Accordingly, in variant 2, when there is a large amount of hydrogen sulfide generated from the single cell (10) and the system shutdown process is performed, air inside the battery case (90) is discharged to the outside through the duct (60) in addition to the auxiliary duct (80). That is, the system shutdown process (second abnormal processing) includes opening the electronic shut-off valve (65) and connecting the inside and outside of the battery case (90) through the duct (60). At this time, the hydrogen sulfide contained in the air is chemically adsorbed by the desulfurizing agent (63), and the hydrogen sulfide is purified.

[0071] The embodiments disclosed herein should be considered illustrative in all respects and not restrictive. The scope of this disclosure is defined by the claims, not by the description of the embodiments described above, and is intended to include all modifications within the meaning and scope equivalent to the claims.

Claims

Claim 1 A battery system comprises a battery case (90), a battery (10) made of a sulfide-based all-solid-state battery housed in the battery case (90), a first detection unit (71) configured to detect hydrogen sulfide disposed on the bottom surface (91a) of the battery case (90) within the battery case (90), a second detection unit (72, 73) configured to detect hydrogen sulfide disposed vertically upward from the bottom surface (91a) within the battery case (90), and a control device (150). The control device (150) comprises an abnormality processing unit configured to perform abnormality processing based on the detection results of the first detection unit (71) and the second detection unit (72, 73). The abnormality processing unit performs a first abnormality processing when hydrogen sulfide is detected solely by the first detection unit (71), and the second detection unit (72, A battery system configured to perform a second abnormal treatment when hydrogen sulfide is detected by 73), wherein the first abnormal treatment is different from the second abnormal treatment. Claim 2 A battery system according to claim 1, wherein the abnormality processing unit is configured to perform the second abnormality processing when hydrogen sulfide is detected in the first detection unit (71) and the second detection unit (72, 73). Claim 3 A battery system according to claim 1, further comprising a communication channel (60) configured to communicate the inside and outside of the battery case (90), wherein the second detection unit (73) is disposed within the communication channel (60). Claim 4 A battery system according to claim 1, further comprising a communication channel (60) configured to communicate the inside and outside of the battery case (90), and a desulfurizing agent (63) configured to adsorb hydrogen sulfide provided within the communication channel (60). Claim 5 A battery system according to claim 4, further comprising an opening / closing valve (65) provided in the above-mentioned passage, wherein the second or more processing comprises opening the opening / closing valve (65) and communicating the inside and outside of the battery case (90) through the above-mentioned passage (60). Claim 6 A battery system according to claim 5, further comprising a secondary communication channel (80) that constantly communicates the inside and outside of the battery case (90). Claim 7 A battery system according to any one of claims 1 to 6, wherein the battery case (90) is mounted on an electric vehicle (100), the battery (10) is a power source for the electric vehicle (100), the first abnormal processing is a retreat driving processing that performs retreat driving of the electric vehicle (100), and the second abnormal processing is a system stop processing that performs driving stop of the electric vehicle (100). Claim 8 In claim 7, the above second or more processing includes a notification processing that performs a notification toward the outside of the electric vehicle (100), a battery system. Claim 9 In claim 8, the battery system is a laminated all-solid-state battery having a laminate film as an outer member (20). Claim 10 An electric vehicle (100) comprising a battery system described in any one of claims 1 to 6, wherein the battery case (90) is mounted on the electric vehicle (100), the battery (10) is a power source for the electric vehicle (100), the first abnormal processing is a retreat driving processing that performs retreat driving of the electric vehicle (100), and the second abnormal processing is a system stop processing that performs driving stop of the electric vehicle (100).

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