Battery system and method for detecting abnormalities in battery system

Abstract

To provide a battery system capable of quickly detecting the generation of hydrogen sulfide from an all-solid-state battery.SOLUTION: A battery system 100 includes a plurality of packs 222 in which all-solid-state battery cells 221 are sealed. The battery system 100 (ECU 150) detects deformation of each of the plurality of packs 222 caused by a change in the internal pressure of each of the plurality of packs 222.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a battery system and a method for detecting an abnormality in a battery system. [Background technology]

[0002] Japanese Patent Application Laid-Open No. 2022-046077 (Patent Document 1) discloses a configuration in which the concentration of hydrogen sulfide generated from an all-solid-state battery in a battery case is detected by a sensor disposed in the battery case. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-046077 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with the configuration of Patent Document 1, it is difficult to detect the generation of hydrogen sulfide unless a certain amount of hydrogen sulfide flows into the battery case. In response to this, a system that can quickly detect the generation of gases such as hydrogen sulfide from an all-solid-state battery is desired.

[0005] The present disclosure has been made to solve the above-mentioned problems, and an object of the present disclosure is to provide a battery system and a method for detecting an abnormality in a battery system that can quickly detect gas generation from an all-solid-state battery. [Means for solving the problem]

[0006] A battery system according to a first aspect of the present disclosure includes at least one pack in which all-solid-state battery cells are sealed, and a detection unit that detects deformation of the at least one pack due to a change in internal pressure of the at least one pack.

[0007] In the battery system according to the first aspect of the present disclosure, as described above, pack deformation due to changes in the internal pressure of the pack is detected. This makes it easier to detect gas generation even when the amount of gas generated is small, compared to when hydrogen sulfide generation is detected based on the concentration of hydrogen sulfide in a battery case that has a capacity significantly larger than that of the pack. As a result, gas generation from the all-solid-state battery cell can be detected quickly.

[0008] In the battery system according to the first aspect, the at least one pack preferably includes a plurality of packs. The detection unit detects deformation of each of the plurality of packs. Here, when detecting the concentration of hydrogen sulfide in a battery case that houses a plurality of packs, it is difficult to determine which pack is generating hydrogen sulfide. In contrast, with the above configuration, it is possible to detect the presence or absence of deformation in each of the plurality of packs. As a result, it is possible to easily detect which of the plurality of packs is generating gas.

[0009] In the battery system according to the first aspect, the detection unit preferably detects deformation of the at least one pack without contacting the at least one pack. This configuration prevents the detection unit from receiving pressure from the pack when the pack deforms, unlike when the detection unit is in contact with the at least one pack. As a result, deterioration of the detection unit can be suppressed.

[0010] In this case, the detection unit preferably includes an imaging unit and detects deformation of the at least one pack based on an image of the at least one pack captured by the imaging unit. With this configuration, deformation of the pack can be easily detected using the image.

[0011] In the battery system in which the detection unit includes an imaging unit, preferably, the at least one pack includes a vent valve that vents gas when the internal pressure reaches or exceeds a predetermined value. The detection unit detects deformation of the at least one pack based on an image showing that the vent valve is open. This configuration makes it possible to more reliably detect gas generation compared to detecting gas generation based only on pack expansion.

[0012] In the battery system in which the detection unit includes an imaging unit, the at least one pack preferably includes a plurality of packs arranged in a predetermined direction. The imaging unit is configured to be movable along the predetermined direction. With this configuration, the imaging unit can be moved close to each of the plurality of packs. As a result, detailed images of each of the plurality of packs can be obtained.

[0013] In the battery system according to the first aspect, the detection unit preferably includes a strain gauge attached in contact with a portion of the at least one pack that deforms due to a change in internal pressure. With this configuration, deformation of the pack can be easily detected based on a change in strain in the pack.

[0014] In the battery system according to the first aspect, the pressure sensor is preferably provided in a portion of at least one pack that deforms due to a change in internal pressure. With this configuration, deformation of the pack can be easily detected based on a change in pressure that the pressure sensor receives from the pack.

[0015] A method for detecting an abnormality in a battery system according to a second aspect of the present disclosure is a method for detecting an abnormality in a battery system including all-solid-state battery cells, and includes the steps of preparing a pack in which the all-solid-state battery cells are sealed, and detecting deformation of the pack due to a change in internal pressure of the pack.

[0016] In the battery system anomaly detection method according to the second aspect of the present disclosure, as described above, pack deformation caused by a change in the internal pressure of the pack is detected, thereby providing a battery system anomaly detection method capable of quickly detecting gas generation from an all-solid-state battery.

[0017] According to the present disclosure, generation of gases such as hydrogen sulfide from an all-solid-state battery can be quickly detected. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a diagram showing the configuration of an electric vehicle equipped with a battery system according to a first embodiment. [Figure 2] 1 is a schematic diagram showing a battery according to a first embodiment; [Figure 3] FIG. 1 is a cross-sectional view of an all-solid-state battery. [Figure 4] 10A and 10B are diagrams showing modifications of the pack according to the first embodiment; [Figure 5] 3 is a diagram illustrating a method for detecting an abnormality in a battery system according to the first embodiment. FIG. [Figure 6] FIG. 10 is a diagram showing a screen that notifies the generation of hydrogen sulfide. [Figure 7] FIG. 10 is a diagram showing the configuration of a battery system according to a second embodiment. [Figure 8] 10A and 10B are diagrams showing deformation of a pack and strain gauges according to a second embodiment. [Figure 9] FIG. 10 is a diagram illustrating an abnormality detection method for a battery system according to a second embodiment. [Figure 10] 10A and 10B are diagrams illustrating deformation of the pack and a pressure sensor according to a modified example of the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference numerals, and description thereof will not be repeated.

[0020] [First embodiment] 1 is a diagram schematically showing the overall configuration of an electric vehicle 300 equipped with a battery system 100 according to the first embodiment. The battery system 100 includes a monitoring module 130, a battery 200, and an ECU 150, which will be described later.

[0021] The electrically powered vehicle 300 is configured to be able to run using electric power stored in the battery 200. In the first embodiment, the electrically powered vehicle 300 is an electric vehicle (BEV) that does not have an engine (internal combustion engine), but it may also be a hybrid vehicle (HEV) or a plug-in hybrid vehicle (PHEV) that has an engine. The battery 200 is charged (externally charged) with electric power supplied from a charging facility.

[0022] The ECU 150 is configured to perform charging control and discharging control of the battery 200. The ECU 150 includes a processor 151, a RAM (Random Access Memory) 152, and a storage device 153.

[0023] The ECU 150 may be a computer, and the processor 151 may be a CPU (Central Processing Unit).

[0024] The RAM 152 functions as a working memory that temporarily stores data to be processed by the processor 151 .

[0025] Storage device 153 is configured to be able to save stored information. In addition to programs, storage device 153 also stores information used by the programs (for example, maps, mathematical expressions, and various parameters). When processor 151 executes the programs stored in storage device 153, various controls in ECU 150 are performed.

[0026] Monitoring module 130 includes various sensors that detect the state of battery 200 (for example, voltage, current, and temperature) and outputs the detection results to ECU 150. Monitoring module 130 may be a BMS (Battery Management System) that has, in addition to the above sensor functions, a SOC (State Of Charge) estimation function, a SOH (State of Health) estimation function, a cell voltage equalization function, a diagnostic function, and a communication function. ECU 150 can obtain the state of battery 200 (for example, temperature, current, voltage, SOC, and internal resistance) based on the output of monitoring module 130.

[0027] The electric vehicle 300 further includes a travel drive unit 110, an HMI (Human Machine Interface) device 120, and drive wheels W.

[0028] The traveling drive unit 110 includes a PCU (Power Control Unit) and an MG (Motor Generator) (both not shown), and is configured to use the electric power stored in the battery 200 to cause the electric vehicle 300 to travel.

[0029] The PCU includes, for example, an inverter, a converter, and a relay (hereinafter referred to as a "System Main Relay (SMR)"). The PCU is controlled by the ECU 150.

[0030] The MG is, for example, a three-phase AC motor generator. The MG is configured to be driven by the PCU and rotate the drive wheels W. The PCU drives the MG using power supplied from the battery 200. The MG is also configured to perform regenerative power generation and supply the generated power to the battery 200.

[0031] The SMR is configured to switch between connection and disconnection of a power path from the battery 200 to the PCU. The SMR is set to a closed state (connected state) when the electric vehicle 300 is traveling.

[0032] The HMI device 120 includes an input device and a display device, and may include a touch panel display 121.

[0033] FIG. 2 is a schematic cross-sectional view of battery 200. Battery 200 includes a battery case 210, a plurality of battery modules 220, an exhaust pipe 230, a camera 240, and a movement mechanism 250. Each of the plurality of battery modules 220, camera 240, and movement mechanism 250 is housed in battery case 210. Note that while FIG. 2 shows an example in which three battery modules 220 are provided, the number of battery modules 220 is not limited to the above example. Furthermore, camera 240 is an example of an "imaging unit" in the present disclosure. Furthermore, each of camera 240 and ECU 150 is included in a "detection unit" in the present disclosure.

[0034] The plurality of battery modules 220 are arranged side by side in the X direction shown in Fig. 2 inside the battery case 210. The battery modules 220 are arranged spaced apart from each other.

[0035] Each of the plurality of battery modules 220 is disposed on the bottom surface 211 of the battery case 210. Each of the plurality of battery modules 220 includes a plurality of all-solid-state battery cells 221 and a pack 222. As will be described with reference to FIG. 3, each of the plurality of all-solid-state battery cells 221 is a sulfide-based all-solid-state battery. The plurality of all-solid-state battery cells 221 of each of the plurality of battery modules 220 are stacked in the Y direction shown in FIG. 2. The Y direction is a direction perpendicular to the above-mentioned X direction.

[0036] The pack 222 encases and houses the multiple all-solid-state battery cells 221 that are stacked on top of each other. As a result, the multiple all-solid-state battery cells 221 are sealed by the pack 222. The pack 222 is a laminated pack (a pouch made of a metal foil laminated film). The pack 222 deforms (for example, expands) when the internal pressure increases due to the generation of hydrogen sulfide.

[0037] The exhaust pipe 230 is provided to extend from the inside to the outside of the battery case 210. The exhaust pipe 230 exhausts hydrogen sulfide inside the battery case 210 to the outside of the battery case 210.

[0038] The camera 240 captures an image of each of the plurality of battery modules 220. The camera 240 captures an image of each of the plurality of battery modules 220 (packs 222) without contacting each of the plurality of battery modules 220. The image of each of the plurality of battery modules 220 acquired by the camera 240 is transmitted to the ECU 150 (see FIG. 1).

[0039] The movement mechanism 250 is attached, for example, to the ceiling surface 212 of the battery case 210 opposite the bottom surface 211 of the battery case 210. The movement mechanism 250 is configured to move the camera 240 along the X direction. Specifically, the movement mechanism 250 can move the camera 240 to a position opposite each of the plurality of battery modules 220 (in the Y direction). This makes it possible to bring the camera 240 close to each of the plurality of battery modules 220 and acquire an image.

[0040] Movement mechanism 250 may automatically move camera 240 at predetermined intervals. Movement mechanism 250 may move camera 240 in accordance with a command from ECU 150. Movement mechanism 250 may also move camera 240 based on a command (operation) from a user via HMI device 120 or a mobile terminal (not shown) or the like. Movement mechanism 250 may be configured to move camera 240 two-dimensionally along ceiling surface 212, not just in the X direction, or may be configured to move camera 240 in the Y direction.

[0041] <All-solid-state battery> 3 is a diagram schematically showing the configuration of an all-solid-state battery cell 221. The all-solid-state battery cell 221 includes, as power storage elements, a positive electrode layer 221a, a negative electrode layer 221b, and a solid electrolyte layer 221c. The all-solid-state battery cell 221 may include an exterior body (not shown) for housing the power storage elements. The exterior body is, for example, a pouch made of a metal foil laminate film.

[0042] <Positive electrode layer> The positive electrode layer 221a includes a positive electrode active material layer 221d and a positive electrode current collector 221e. The positive electrode active material layer 221d is formed by applying a positive electrode slurry (prepared by kneading the material of the positive electrode active material layer 221d with a solvent) to the surface of the positive electrode current collector 221e and drying the applied slurry. The positive electrode active material layer 221d is in close contact with the solid electrolyte layer 221c. The thickness of the positive electrode active material layer 221d is, for example, 0.1 μm or more and 1000 μm or less.

[0043] <Negative electrode layer> The negative electrode layer 221b includes a negative electrode active material layer 221f and a negative electrode current collector 221g. The negative electrode active material layer 221f is formed by applying a negative electrode slurry (prepared by kneading the material of the negative electrode active material layer 221f with a solvent) to the surface of the negative electrode current collector 221g and drying the applied slurry. The negative electrode active material layer 221f is in close contact with the solid electrolyte layer 221c. The thickness of the negative electrode active material layer 221f is, for example, 0.1 μm or more and 1000 μm or less.

[0044] ≪Solid electrolyte layer≫ The solid electrolyte layer 221c is interposed between the positive electrode layer 221a and the negative electrode layer 221b. The solid electrolyte layer 221c separates the positive electrode layer 221a from the negative electrode layer 221b. The thickness of the solid electrolyte layer 221c is, for example, not less than 0.1 μm and not more than 1000 μm.

[0045] The positive electrode layer 221a, the solid electrolyte layer 221c, and the negative electrode layer 221b are stacked in the direction in which the multiple all-solid-state battery cells 221 are stacked (Y direction). In the example shown in Fig. 3, the positive electrode layer 221a is provided on the Y1 side of the solid electrolyte layer 221c, and the negative electrode layer 221b is provided on the Y2 side (opposite to Y1) of the solid electrolyte layer 221c. The positions of the positive electrode layer 221a and the negative electrode layer 221b may be opposite to those in the example shown in Fig. 3.

[0046] FIG. 4 is a diagram showing how the pack 222 deforms in response to changes in the internal pressure of the pack 222. As shown in FIG.

[0047] 4(A) is a diagram showing a case where the internal pressure of the pack 222 is low because no hydrogen sulfide is generated (or the amount generated is small) from the all-solid-state battery cell 221. In this case, the pack 222 is not deformed.

[0048] FIG. 4(B) is a diagram showing a case where the internal pressure of the pack 222 is moderate due to the generation of hydrogen sulfide from the all-solid-state battery cell 221. In this case, the portion 222a of the pack 222 changes so as to expand. Note that the internal pressure of the pack 222 in this case is less than a threshold value, which will be described later. Note that the portion 222a is provided in the center in the X direction of the surface of the pack 222 on the Y1 side (camera 240 side). The portion 222a is a portion formed so as to be able to expand due to an increase in the internal pressure of the pack 222. For example, the portion 222a is a portion formed so as to sag slightly when no hydrogen sulfide is generated. Furthermore, the portion 222a may be a portion having lower rigidity than portions of the pack 222 other than the portion 222a.

[0049] 4(C) is a diagram showing a case where the internal pressure of the pack 222 is high due to hydrogen sulfide being generated from the all-solid-state battery cell 221. In this case, in addition to the expansion of the portion 222a of the pack 222, the exhaust valve 222b of the pack 222 opens. The exhaust valve 222b has a function of exhausting hydrogen sulfide from the pack 222. The exhaust valve 222b is formed to open when the internal pressure of the pack 222 reaches or exceeds a threshold value. The exhaust valve 222b is provided, for example, at the end of the Y1 side (camera 240 side) of the pack 222 on the X1 side.

[0050] In conventional battery systems, the generation of hydrogen sulfide is detected by placing a sensor for detecting hydrogen sulfide inside the battery case. In this case, it is difficult to detect the generation of hydrogen sulfide unless a certain amount of hydrogen sulfide flows into the battery case. In response to this, a system that can quickly detect the generation of hydrogen sulfide from an all-solid-state battery is desired.

[0051] In the first embodiment, the ECU 150 detects deformation of the pack 222 caused by a change in the internal pressure of the pack 222. Specifically, the ECU 150 determines whether the pack 222 is deformed or not based on an image of the pack 222 captured by the camera 240. The ECU 150 detects deformation of each of the plurality of packs 222 based on the image of each of the plurality of packs 222 captured by the camera 240.

[0052] Specifically, ECU 150 determines that pack 222 is deformed when it detects that portion 222a (see FIG. 4A) of pack 222 is expanded based on the image of pack 222. Furthermore, ECU 150 determines that pack 222 is deformed when it detects that exhaust valve 222b (see FIG. 4C) of pack 222 is open based on the image of pack 222.

[0053] For example, an image of the pack 222 when no hydrogen sulfide is generated (see FIG. 4A) is stored in the storage device 153 of the ECU 150. The ECU 150 (processor 151) determines whether the pack 222 is deformed by comparing the image stored in the storage device 153 with an image of the pack 222 acquired by the camera 240. In addition, the above determination process may use, for example, a trained model generated by machine learning technology such as deep learning.

[0054] <Method for detecting abnormalities in battery systems> Next, a method for detecting an abnormality in the battery system 100 will be described with reference to Figures 5 and 6. Note that the following steps S3 to S5 are continuously repeated at predetermined intervals.

[0055] In step S1, the pack 222 is prepared. Specifically, a battery module 220 is prepared in which a plurality of all-solid-state battery cells 221 are sealed in the pack 222. In step S2, an image of the pack 222 before deformation (see FIG. 4(A)) is stored in the storage device 153 (see FIG. 1). Note that the processes of steps S1 and S2 are processes that are performed in the manufacturing stage of the electric vehicle 300. The following processes of steps S3 to S5 are performed when the electric vehicle 300 is being used by a user.

[0056] In step S3, camera 240 acquires an image of each of the plurality of packs 222 in battery case 210. Camera 240 may capture images of the plurality of packs 222 in sequence (one by one) while being moved by movement mechanism 250. Camera 240 may also have a wide angle of view so that it can simultaneously capture images of the plurality of packs 222.

[0057] In step S4, ECU 150 determines whether pack 222 is deformed. Specifically, ECU 150 compares the image of pack 222 before deformation stored in storage device 153 in step S2 with the image of pack 222 acquired in step S3. If ECU 150 detects at least one of expansion of portion 222a of pack 222 and opening of exhaust valve 222b through the comparison, it determines that pack 222 is deformed. If it is determined that pack 222 is deformed (Yes in S4), the process proceeds to step S5. If it is determined that pack 222 is not deformed (No in S4), the process ends.

[0058] In step S5, ECU 150 notifies the user of electric vehicle 300 of the generation of hydrogen sulfide. For example, as shown in Fig. 6, ECU 150 displays message 122, "Hydrogen sulfide may be being generated from the battery," on touch panel display 121 of HMI device 120. Note that instead of (or in addition to) displaying message 122, the notification may be made by voice. Furthermore, ECU 150 may transmit a signal to a mobile terminal or the like (not shown) of the user to make the above notification.

[0059] As described above, in this embodiment, ECU 150 detects deformation of pack 222 caused by a change in the internal pressure of pack 222 based on images acquired by camera 240. This makes it possible to detect the generation of hydrogen sulfide more quickly than in the case of directly detecting hydrogen sulfide discharged from pack 222 to battery case 210. As a result, it is possible to prevent hydrogen sulfide from being discharged into battery case 210.

[0060] [Second embodiment] A second embodiment of the present disclosure will be described with reference to Figures 7 to 9. In the second embodiment, a strain gauge 510 is used to detect deformation of the pack 222. The same components as those in the first embodiment are denoted by the same reference numerals and will not be described repeatedly.

[0061] 7 is a diagram schematically showing the configuration of a battery system 400 according to the second embodiment. The battery system 400 includes a battery 500 and an ECU 450.

[0062] The ECU 450 is configured to perform charging control and discharging control of the battery 500. The ECU 450 includes a processor 451, a RAM 452, and a storage device 453.

[0063] Battery 500 differs from battery 200 of the first embodiment in that it includes strain gauges 510 instead of camera 240 and moving mechanism 250 (both see FIG. 2). Strain gauges 510 are attached to each of a plurality of packs 222. Data on the amount of strain detected by strain gauges 510 is transmitted to ECU 450. Note that strain gauges 510 and ECU 450 are each included in the "detection unit" of the present disclosure.

[0064] 8(A), strain gauge 510 is attached in contact with portion 222a of pack 222. For example, strain gauge 510 is fixed to portion 222a by being adhered with an adhesive or the like. When the internal pressure of pack 222 is low and pack 222 is not deformed, the amount of strain detected by strain gauge 510 is zero.

[0065] When portion 222a expands due to hydrogen sulfide (see FIG. 8(B)), the strain detected by strain gauge 510 becomes greater than 0. When the amount of strain detected by strain gauge 510 becomes equal to or greater than a threshold value, ECU 450 determines that pack 222 is deformed.

[0066] <Method for detecting abnormalities in battery systems> Next, a method for detecting an abnormality in the battery system 400 will be described with reference to Fig. 9. Note that detailed descriptions of steps that are the same as those in the first embodiment will not be repeated. The following steps S11, S12, and S5 are performed when the electric vehicle is being used by a user, and are continuously repeated at predetermined intervals.

[0067] In step S11 after step S1, ECU 450 acquires data on the detected values ​​(amount of strain) of strain gauges 510 attached to each pack 222.

[0068] In step S12, ECU 450 determines whether pack 222 is deformed. Specifically, ECU 450 determines that pack 222 is deformed when the detection value of strain gauge 510 acquired in step S11 is equal to or greater than a threshold value. If it is determined that pack 222 is deformed (Yes in S12), the process proceeds to step S5. If it is determined that pack 222 is not deformed (No in S12), the process ends.

[0069] The other configurations and effects are the same as those of the first embodiment, and therefore will not be described repeatedly.

[0070] In the second embodiment, an example was shown in which the strain gauge 510 was provided in the portion 222a of the pack 222, but the present disclosure is not limited to this. As shown in Fig. 10, a pressure sensor 610 may be provided so as to correspond to the portion 222a. The pressure sensor 610 is provided in each portion 222a of the multiple packs 222.

[0071] 10(A), the pressure sensor 610 is provided at a distance from the portion 222a of the pack 222 when the pack 222 is not deformed. In other words, the pressure sensor 610 is provided adjacent to (facing) the portion 222a of the pack 222 when the pack 222 is not deformed. The pressure sensor 610 may be fixed to, for example, the ceiling surface 212 of the battery case 210 (see FIG. 2).

[0072] 10(B), pressure sensor 610 comes into contact with portion 222a in a deformed state. As a result, when pack 222 is deformed, the detection value detected by pressure sensor 610 increases. When the detection value is equal to or greater than a threshold value, the ECU determines that pack 222 is deformed. Note that pressure sensor 610 may also come into contact with portion 222a of pack 222 in an undeformed state. Furthermore, pressure sensor 610 is included in the "detection unit" of the present disclosure.

[0073] Also, a distance sensor may be provided at a position facing portion 222a instead of pressure sensor 610. The distance sensor can detect a change in the distance between the distance sensor and portion 222a due to the expansion of portion 222a.

[0074] In the first and second embodiments, an example in which a plurality of packs 222 are provided in the battery has been described, but the present disclosure is not limited to this. The battery may be provided with only one pack 222. Furthermore, each pack 222 may include one sealed all-solid-state battery cell 221.

[0075] In the above embodiment, an example was shown in which the ECU determines the deformation of the pack, but the present disclosure is not limited to this. A sensor such as a camera or a strain gauge may perform the above determination and transmit the determination result to the ECU.

[0076] The configurations (processing) of the above-described embodiment and the above-described modifications may be combined with each other.

[0077] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present disclosure is defined by the claims, not by the description of the above embodiments, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0078] 100, 400 battery system, 150, 450 ECU (detection unit), 221 all-solid-state battery cell, 222 pack, 221a part (deformable part), 222b discharge valve, 240 camera (imaging unit) (detection unit), 510 strain gauge (detection unit), 610 pressure sensor.

Claims

1. Multiple packs of sealed solid-state battery cells; a single acquisition unit that acquires information based on deformation of each of the plurality of packs due to a change in internal pressure of the plurality of packs; a detection unit that detects deformation of each of the plurality of packs based on the information acquired by the acquisition unit, A battery system, wherein the acquisition unit is disposed in a non-contact state with the plurality of packs.

2. the acquisition unit includes an imaging unit, The battery system according to claim 1 , wherein the detection unit detects deformation of each of the plurality of packs based on images of the plurality of packs captured by the imaging unit.

3. Each of the plurality of packs includes a discharge valve that discharges gas when the internal pressure reaches or exceeds a predetermined value, The battery system according to claim 2 , wherein the detection unit detects deformation of each of the plurality of packs based on the image indicating that the discharge valve is open.

4. the plurality of packs are arranged in a predetermined direction, The battery system according to claim 2 , wherein the imaging unit is configured to be movable along the predetermined direction.

5. A method for detecting an abnormality in a battery system including an all-solid-state battery cell, preparing a plurality of packs in which the all-solid-state battery cells are sealed; acquiring information based on deformation of each of the plurality of packs caused by a change in internal pressure of the plurality of packs by a single acquisition unit that is not in contact with the plurality of packs; detecting deformation of each of the plurality of packs based on the information acquired by the acquisition unit.

6. At least one pack in which all-solid-state battery cells are sealed; a detection unit that detects deformation of the at least one pack due to a change in internal pressure of the at least one pack, the detection unit detects deformation of the at least one pack in a non-contact state with the at least one pack; The detection unit An imaging unit is included, A battery system that detects deformation of the at least one pack based on an image of the at least one pack captured by the imaging unit.

Images