Battery pack and battery system

Abstract

To detect the occurrence of gas in a battery pack without the need to install a sensor for detecting the concentration of the gas.SOLUTION: A single battery 10 consists of a sulfide all solid-state battery. Busbars 51, 52, and 53 of a battery module 50, which electrically connect the single battery 10 in series, are connected to a voltage detection circuit via a printed circuit board 60 with wires La and Lb. A part of the wiring Lb is exposed from the insulating coating film by the notches (missing portions) 60n in the insulating coating film. When the difference between the voltage of single battery 10 between wirings La and the voltage of single battery between wiring La and wiring Lb is greater than a predetermined value, the exposed part of wiring Lb is corroded by the gas generated from the single battery 10 and it is determined that gas is generated from the single battery 10.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a battery pack and a battery system. [Background technology]

[0002] JP 2022-12308 A (Patent Document 1) discloses a battery system in which a gas sensor that detects the concentration of gas including hydrogen sulfide is provided within a battery pack, and a diagnostic device that diagnoses that an abnormal high concentration of hydrogen sulfide has occurred if the concentration detected by the gas sensor is higher than a threshold concentration. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-12308 Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, in order to detect an abnormally high concentration of hydrogen sulfide, it is necessary to provide a sensor for detecting the gas concentration inside the battery pack.

[0005] An object of the present disclosure is to make it possible to detect the generation of gas in a battery pack without providing a sensor for detecting the concentration of the gas. [Means for solving the problem]

[0006] The battery pack of the present disclosure includes a battery, which is a sulfide-based all-solid-state battery housed in a battery case and includes a first electrode terminal and a second electrode terminal, and a printed circuit board including wiring connected to the first electrode terminal and the second electrode terminal. The printed circuit board includes a first wiring connected to the first electrode terminal, a second wiring and a third wiring connected to the second electrode terminal, and an insulating coating covering the first wiring, the second wiring, and the third wiring, and at least a portion of the third wiring is exposed from the insulating coating and is exposed to gas generated from the battery.

[0007] According to this configuration, at least a portion of the third wiring is exposed from the insulating coating and is exposed to gas generated from the battery. Therefore, when gas is generated from the battery, the portion of the third wiring exposed from the insulating coating is corroded by the gas. As a result, the conductivity of the third wiring changes, for example, the resistance value of the third wiring increases. By detecting this change, it becomes possible to detect the gas generated from the battery without providing a sensor for detecting the gas concentration.

[0008] In the third wiring, the thickness of the portion exposed from the insulating film may be thinner than the thickness of the portion covered with the insulating film.

[0009] With this configuration, the portion exposed from the insulating coating is thinner than the portion covered by the insulating coating, and is therefore more susceptible to corrosion by gas. This causes a larger change in the conductivity of the third wiring due to corrosion, making it possible to detect gas generated by the battery.

[0010] The battery includes a power generating element made of an all-solid-state battery laminate, and an exterior member made of a laminate film that houses the power generating element and has a peripheral portion joined by thermal welding to seal the power generating element, and the portion of the third wiring that is exposed from the insulating coating may be disposed adjacent to the second electrode terminal.

[0011] According to this configuration, the battery has an exterior member made of a laminate film, and the first electrode terminal and the second electrode terminal extend from the laminate film. Gas (e.g., hydrogen sulfide) generated in the battery is likely to leak from the seal between the first electrode terminal and the second electrode terminal and the laminate film. The exposed portion of the third wiring adjacent to the second electrode terminal is exposed to the gas leaking from the seal, so that the change in conductivity of the third wiring due to corrosion becomes large, making it possible to detect the gas generated from the battery.

[0012] The battery system of the present disclosure includes the battery pack, a detection device connected to the printed circuit board, and a control device. When the control device detects, using the detection device, that the portion of the third wiring exposed from the insulating film is corroded, the control device determines that gas is being generated.

[0013] According to this configuration, when the control device detects that the third wiring of the battery pack is corroded using the detection device, it determines that gas is being generated. This makes it possible to detect gas generated from the battery without providing a sensor for detecting the concentration of gas.

[0014] Preferably, the detection device is a battery voltage detection circuit, and the control device may determine that gas is being generated when the difference between a first battery voltage, which is the battery voltage detected using the first wiring and the second wiring, and a second battery voltage, which is the battery voltage detected using the first wiring and the third wiring, is greater than or equal to a predetermined value.

[0015] According to this configuration, the generation of gas can be detected by utilizing the battery voltage detection circuit. Effect of the Invention

[0016] According to the present disclosure, generation of gas within a battery pack can be detected without providing a sensor for detecting the concentration of gas. [Brief description of the drawings]

[0017] [Figure 1] 1 is a diagram showing a schematic overall configuration of a vehicle equipped with a battery pack according to an embodiment of the present invention; [Diagram 2] 1(A) and 1(B) are schematic configuration diagrams of a battery module. [Diagram 3] 1(A) and 1(B) are diagrams illustrating the schematic configuration of a single cell. [Figure 4] 2 is a diagram illustrating a schematic configuration of a voltage detection circuit included in the monitoring module. FIG. [Diagram 5]FIG. 4 is a diagram showing an example of a flowchart of a gas generation detection process executed by an ECU. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] 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 denoted by the same reference characters, and the description thereof will not be repeated.

[0019] 1 is a diagram illustrating a schematic overall configuration of a vehicle 100 equipped with a battery pack 200 according to an embodiment of the present disclosure. The vehicle 100 includes a battery pack 200 that stores electric power for running. The vehicle 100 is configured to be capable of running using the electric power stored in the battery pack 200. In the present embodiment, the vehicle 100 is an electric vehicle (BEV) that does not include an engine (internal combustion engine), but may also be a hybrid vehicle (HEV) that includes an engine, or a plug-in hybrid vehicle (PHEV).

[0020] The vehicle 100 includes a control device (ECU: Electronic Control Unit) 150. The ECU 150 is configured to perform charging control and discharging control of the battery pack 200. The ECU 150 includes a processor 151, a RAM (Random Access Memory) 152, and a storage device 153. The RAM 152 functions as a working memory that temporarily stores data processed by the processor 151. The storage device 153 stores information used by the programs (for example, maps, mathematical expressions, and various parameters). The processor 151 executes the programs stored in the storage device 153, thereby performing various controls in the ECU 150.

[0021] The monitoring module 130 includes various sensors that detect the state (for example, voltage, current, and temperature) of the battery pack 200 (battery module 50), and outputs the detection results to the ECU 150. The monitoring module 130 is also connected to a printed circuit board 60, which will be described later, and is capable of detecting the voltage of the battery module 50 (single cell 10).

[0022] The vehicle 100 further includes a traveling drive unit 110, an HMI (Human Machine Interface) device 120, a MIL (Malfunction Indicator Lamp) 125, a hazard lamp 140, an external display 160, and driving wheels W. The traveling drive unit 110 includes a PCU (Power Control Unit) and an MG (Motor Generator), not shown, and is configured to drive the MG using power stored in a battery pack 200 to cause the vehicle 100 to travel. The MG is also configured to perform regenerative power generation and supply the generated power to the battery pack 200. The battery pack 200 can be charged (externally charged) by power supplied from a charging facility.

[0023] The HMI device 120 includes an input device and a display device. The HMI device 120 may include a touch panel display. The MIL 125 is a warning light arranged on an instrument panel. The hazard lamps 140 are lamps arranged on the front, rear, left and right sides of the vehicle 100, and are the same as turn signals (directional indicators), and function as emergency flashing indicator lights. The external display 160 is, for example, an LED display, and is provided on the rear window so that the display content can be viewed from outside the vehicle 100.

[0024] The battery pack 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 a space formed by the lower case 91 and the upper case 92. A desulfurization unit (not shown) equipped with a breathing membrane is attached to the opening 70 of the upper case 92, and the inside and outside of the battery case 90 are communicated through the desulfurization unit. When the internal pressure of the battery case 90 becomes high, the desulfurization unit discharges the air in the battery case 90 to the outside. At this time, the desulfurization unit adsorbs hydrogen sulfide in the air. When the internal pressure of the battery case 90 becomes low, the outside air (outside air) is taken in. The battery pack 200 is mounted on the floor of the vehicle 100, and may be mounted on the inside of the vehicle cabin of the vehicle 100 or on the outside of the vehicle cabin of the vehicle 100.

[0025] Fig. 2 is a diagram showing a schematic configuration of a battery module 50. Fig. 2(A) is a top view of the battery module 50, and Fig. 2(B) is an enlarged view of part F in Fig. 2(A). The battery module 50 is an assembled battery in which a plurality of unit cells 10 are electrically connected in series. The plurality of unit cells 10 are stacked between a pair of end plates 30.

[0026] FIG. 3 is a diagram illustrating a schematic configuration of a cell 10 in this embodiment. FIG. 3(A) is a top view of the cell 10. The cell 10 is a laminated type all-solid-state battery using a laminate film as the exterior member 20, and a negative electrode terminal (negative electrode tab) 1a and a positive electrode terminal (positive electrode tab) 5a extend from the exterior member 20. One of the negative electrode terminal 1a and the positive electrode terminal 5a corresponds to the "first electrode terminal" of the present disclosure, and the other corresponds to the "second electrode terminal" of the present disclosure. The laminate film may be, for example, a pouch made of an aluminum laminate film, or a film with a three-layer structure in which aluminum foil is sandwiched between resin films.

[0027] FIG. 3(B) shows the all-solid-state battery laminate 15 housed in the exterior member 20, and shows the cross section BB of FIG. 3(A). In the all-solid-state battery laminate 15, three all-solid-state battery elements 8, each of which is composed of 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 stacked in this order, are stacked in the 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. The number of all-solid-state battery elements 8 included in the all-solid-state battery laminate 15 may be one, or may be four or more. The insulating film 7 insulates between the all-solid-state battery laminate 15 and the exterior member (laminate film) 20. The all-solid-state battery laminate 15 or the all-solid-state battery element 8 corresponds to an example of the "power generation element" of the present disclosure. After the all-solid-state battery stack 15 is housed in an exterior member (laminate film) 20, the outer periphery (peripheral edge) of the exterior member 20 is joined by thermal welding (thermal fusion) to seal the all-solid-state battery stack 15. As a result, a seal portion is formed on the outer periphery of the exterior member.

[0028] The cell 10 is a sulfide-based all-solid-state battery. In the present disclosure, a sulfide-based all-solid-state battery is one in which at least one of the material of the positive electrode active material layer 4 and the material of the solid electrolyte layer 3 contains a sulfur component. In the present embodiment, the solid electrolyte layer 3 contains a sulfide-based solid electrolyte, and for example, the sulfide-based solid electrolyte may be one that uses phosphorus pentasulfide (P2S5) or lithium sulfide (Li2S) as a starting material. In this case, the positive electrode active material layer 4 may contain, for example, lithium cobalt oxide, lithium nickel oxide, lithium iron phosphate, or the like. 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. The sulfur-based positive electrode active material may be an organic sulfur compound or an inorganic sulfur compound. Note that both the solid electrolyte layer 3 and the positive electrode active material layer 4 may contain a sulfur component.

[0029] Referring to FIG. 2, a plurality (n pieces) of unit cells 10 are arranged and stacked between a pair of end plates 30. The unit cells 10 are sandwiched between the pair of end plates 30 in a stacked state, and a predetermined restraining load is applied by a restraining band or the like (not shown). The negative electrode terminals 1a and positive electrode terminals 5a of adjacent unit cells 10 are electrically connected in series by a bus bar 51. In FIG. 2, twelve unit cells 10 are connected in series, but the number of unit cells 10 may be any number. In FIG. 2(A), a bus bar 52 is connected to the positive electrode terminal 5a of the unit cell 10 located at the leftmost position, and a bus bar 53 is connected to the negative electrode terminal 1a of the unit cell 10 located at the rightmost position. When two battery modules 50 are connected in series, one of the bus bar 52 and the bus bar 53 is connected to the other battery module 50, and the other is connected to an output terminal. When two battery modules 50 are connected in parallel, the bus bar 52 and the bus bar 53 are connected to an output terminal.

[0030] The battery module 50 is provided with a printed circuit board 60 including wiring connected to the bus bars 51, 52, and 53. The printed circuit board 60 is, for example, a flexible printed circuit board (FPC: Flexible Printed Circuits), and is formed by providing wiring made of a conductive foil (for example, copper foil) on the surface of a base film via an adhesive layer, and covering the wiring with an insulating film (cover layer). As shown in FIG. 2(B), the printed circuit board 60 is provided with a plurality of wirings La and a plurality of wirings Lb. The wirings La are wirings (for example, copper foils) all of which are covered with an insulating film, and are indicated by dashed lines. The wirings Lb are wirings in which a part of the wiring is exposed from the insulating film, and the wirings exposed from the insulating film (hereinafter also referred to as exposed parts) are indicated by solid lines, and the wirings covered with the insulating film are indicated by dashed lines. The exposed parts of the wirings Lb may be thinner than the parts of the wirings La and Lb covered with the insulating film. The exposed portion of the wiring Lb may be formed by providing a notch (missing portion) 60n in the insulating coating.

[0031] 2(B), the wiring La (La-1) of the printed circuit board 60 is connected to the bus bar 52 via a connector 61. This wiring La (La-1) is connected to the positive electrode terminal 5a of the rightmost cell 10 (10-1) via the bus bar 52. This wiring La (La-1) corresponds to the "first wiring" of the present disclosure. The wiring La (La-2) and wiring Lb (Lb-1) are connected to the bus bar 51 (51-1) via a connector 62, the bus bar 51 (51-1) connecting the negative electrode terminal 1a of the cell 10 (10-1) and the positive electrode terminal 5a of the cell 10 (10-2) adjacent to the cell 10 (10-1). The wiring La (La-2) and wiring Lb (Lb-1) are connected to the negative electrode terminal 1a of the cell 10 (10-1) and the positive electrode terminal 5a of the cell 10 (10-2) via the bus bar 51 (51-1). The wiring La (La-2) corresponds to the "second wiring" in the present disclosure, and the wiring Lb (Lb-1) corresponds to the "third wiring" in the present disclosure.

[0032] A wiring La (La-3) is connected via a connector 61 to a bus bar 51 (51-2) that connects the negative electrode terminal 1a of the cell 10 (10-2) and the positive electrode terminal 5a of the cell 10 (10-3) adjacent to the cell 10 (10-2). This wiring La (La-3) is connected via the bus bar 51 (51-2) to the negative electrode terminal 1a of the cell 10 (10-2) and the positive electrode terminal 5a of the cell 10 (10-3). This wiring La (La-3) corresponds to the "first wiring" in this disclosure.

[0033] A bus bar 51 (51-3) that connects the negative terminal 1a of the cell 10 (10-3) and the positive terminal 5a of the cell 10 (10-4) adjacent to the cell 10 (10-3) is connected to the wiring La (La-4) and the wiring Lb (Lb-2) via a connector 62. The wiring La (La-4) and the wiring Lb (Lb-2) are connected to the negative terminal 1a of the cell 10 (10-3) and the positive terminal 5a of the cell 10 (10-4) via the bus bar 51 (51-3). The wiring La (La-4) corresponds to the "second wiring" in this disclosure, and the wiring Lb (Lb-2) corresponds to the "third wiring" in this disclosure. In the following, the bus bars 51 and 53 are connected to the wiring La and the wiring Lb by a similar configuration, and the printed circuit board 60 is connected to the monitoring module 130.

[0034] 4 is a diagram illustrating a schematic configuration of the voltage detection circuit 131 included in the monitoring module 130. This voltage detection circuit 131 also functions as an equalization unit that equalizes the voltages of the cells 10. The monitoring module 130 or the voltage detection circuit 131 corresponds to an example of a “detection device” in the present disclosure. The voltage detection circuit 131 is connected to the wiring La and wiring Lb of the printed circuit board 60.

[0035] The voltage detection circuit 131 detects the voltage of the cell 10 via a plurality of voltage detection lines L1, branch lines L11, and branch lines L12. The voltage detection line L1 is connected to the positive terminal of the cell 10 (10-1) and the negative terminal of the cell 10 (10-n) (more specifically, bus bars 52, 53) via wiring La of the printed circuit board 60. In addition, between the cell 10 (10-1) and the cell 10 (10-n), the voltage detection line L1 is connected to the negative terminal of one cell and the positive terminal of the other cell (more specifically, bus bar 51) via wiring La or wiring Lb of the printed circuit board 60.

[0036] Between the single battery 10 (10-1) and the single battery 10 (10-n), a bus bar 51 (51-1, 51-3, ...) to which the wiring La and the wiring Lb are connected, and the voltage detection line L1 are provided with a switch S1, and the switch S1 is configured to selectively switch the connection between the voltage detection line L1 and the wiring La and the connection between the voltage detection line L1 and the wiring Lb.

[0037] The voltage detection line L1 is provided with a fuse F and chip beads Cb. The fuse F melts when an overcurrent occurs to protect the circuit. The chip beads Cb reduce the applied stress when a surge voltage is applied instantaneously.

[0038] A Zener diode D is connected in parallel to the cells 10 via a voltage detection line L1. The cathode of the Zener diode D is connected to the positive terminal side of the corresponding cell, and the anode is connected to the negative terminal side of the corresponding cell. When an overvoltage is applied from the battery module 50 (cell 10) to the voltage detection circuit 131, a current flows through the Zener diode D, thereby protecting the voltage detection circuit 131 from the overvoltage.

[0039] The voltage detection line L1 branches into a branch line L11 and a branch line L12 on the monitoring module 130 side of the Zener diode D. The branch line L11 is connected to the comparator 131a via a switch So, and the branch line L12 is connected to the comparator 131a via a switch Sh. For example, a photo MOS (Metal Oxide Semiconductor) relay can be used for the switch So and the switch Sh. Note that the branch line L11 branched from the voltage detection line L1 connected to the positive terminal (bus bar 52) of the cell 10 (10-1) arranged on the positive output terminal side of the battery module 50 is not connected to the comparator 131a. In addition, the voltage detection line L1 connected to the negative terminal of the cell 10 (10-n) arranged on the negative output terminal side of the battery module 50 does not include the branch line L12.

[0040] A resistor R1 is provided in the branch line L12. A capacitor (flying capacitor) C is provided between the branch line L12 connected to the positive terminal of each cell 10 and the branch line L11 connected to the negative terminal. In the branch line L12, the capacitor C is connected between the resistor R1 and the switch Sh, and the resistor R1 and the capacitor C form an RC low-pass filter. The capacitor C is connected in parallel with the corresponding cell 10, and the charge of the corresponding cell 10 is charged to the capacitor C, and the voltage value of the capacitor C becomes equal to the voltage value of the corresponding cell 10. By turning on (closing) the switch Sh and the switch So corresponding to a specific cell 10, the comparator 131a outputs the voltage of the specific cell 10. As a result, the monitoring module 130 can detect the voltage of each cell 10 using the voltage detection circuit 131 by sequentially turning on the switches Sh and So corresponding to each cell 10.

[0041] The voltage detection circuit 131 includes a discharge resistor Rd provided in the branch line L11 and a switch S1 that connects (closes) / disconnects (opens) adjacent branch lines L11, and functions as an equalization unit. For example, by closing the switch S1 corresponding to a cell 10 having a higher voltage than the reference voltage, the current discharged from that cell 10 is consumed by the discharge resistor Rd, and the voltages of the cells 10 can be equalized.

[0042] In the single battery 10, for example, there is a concern that air may infiltrate from a sealed portion of the exterior member 20 (laminate film). In particular, the negative electrode terminal 1a and the positive electrode terminal 5a (electrode tab) extend from the sealed portion of the exterior member 20, and the exterior member (laminate film) 20 is joined and sealed so as to sandwich the negative electrode terminal 1a and the positive electrode terminal 5a, and air is likely to infiltrate from the sealed portion of the seal portion. If the infiltrating air contains moisture, the sulfur component contained in the solid electrolyte layer 3 or the positive electrode active material layer 4 reacts with the moisture to generate hydrogen sulfide, which may be released into the battery case 90. In this embodiment, the generation of hydrogen sulfide is detected by utilizing the fact that the exposed portion of the wiring Lb is corroded by hydrogen sulfide and its conductivity changes.

[0043] FIG. 5 is a diagram showing an example of a flowchart of the gas generation detection process executed by the ECU 150. This flowchart may be processed at predetermined intervals. For example, the process may be performed when the power switch of the vehicle 100 is turned ON, at predetermined time intervals while the vehicle 100 is running, or at the start of external charging of the battery pack 200 (battery module 50). In step (hereinafter, step is abbreviated as "S") 10, the switch S2 of the voltage detection circuit 131 is switched to the wiring Lb. This connects the wiring Lb to the voltage detection line L1. In the following step S11, after the switch S2 is switched to the wiring Lb, the switches Sh and So corresponding to each cell 10 are sequentially turned ON after a set time has elapsed, and the voltage VBb of each cell 10 is detected.

[0044] In S12, the switch S2 of the voltage detection circuit 131 is switched to the wire La. This connects the wire La to the voltage detection line L1. In the following S13, after the switch S2 is switched to the wire La and a set time has elapsed, the switches Sh and So corresponding to each cell 10 are sequentially turned ON to detect the voltage VBa of each cell 10.

[0045] In the subsequent S14, after calculating the largest value (maximum value) MAXΔVB in the difference (|VBa - VBb|) between the voltages VBa and VBb of each single battery 10, the process proceeds to S15. In S15, it is determined whether the maximum value MAXΔVB is equal to or greater than a predetermined value A. If the maximum value MAXΔVB is less than the predetermined value A (MAXΔVB < A), a negative determination is made and the current routine ends.

[0046] If the maximum value MAXΔVB is equal to or greater than the predetermined value A (MAXΔVB ≥ A), an affirmative determination is made and the process proceeds to S16. In S16, it is determined that hydrogen sulfide (gas) is being generated from the single battery 10. Also, to notify the generation of hydrogen sulfide, MIL125 is lit, a message indicating "Battery abnormality" is displayed on the display device of the HMI device 120, the hazard lamp 140 is blinked, and a message indicating "Caution (Hydrogen sulfide)" is displayed on the external display 160.

[0047] When hydrogen sulfide is generated and released in the single battery 10, the exposed portion of the wiring Lb is corroded by the hydrogen sulfide, its conductivity changes, for example, the resistance value of the wiring Lb increases. For this reason, when the exposed portion of the wiring Lb is corroded by hydrogen sulfide, the difference in the time constant of the RC circuit including the capacitor C becomes large between the voltage detection line L1 connected to the wiring La and the voltage detection line L1 connected to the wiring Lb. Therefore, when the difference between the voltage VBa detected using the wiring La and the voltage VBb detected using the wiring Lb becomes large and the maximum value MAXΔVB is equal to or greater than the predetermined value A, it can be determined that hydrogen sulfide is being generated from the single battery 10, and the generation of hydrogen sulfide can be detected.

[0048] Note that when the above gas generation detection process is not being executed, the ECU150 selects to switch the switch S2 so as to always connect the wiring La and the voltage detection line L1. Thereby, the voltage detected using the wiring La is adopted as the voltage value of each single battery 10, and various controls such as battery control can be executed.

[0049] According to the above embodiment, the battery module 50 includes a single cell 10 made of a sulfide-based solid battery including a negative electrode terminal 1a and a positive electrode terminal 5a, and a printed circuit board 60 including wiring connected to the negative electrode terminal 1a and the positive electrode terminal 5a. The printed circuit board 60 has a wiring La connected to one of the negative electrode terminal 1a and the positive electrode terminal 5a, and a wiring La and a wiring Lb connected to the other of the negative electrode terminal 1a and the positive electrode terminal 5a. The wiring La and the wiring Lb are covered with an insulating film, and a portion of the wiring Lb adjacent to the negative electrode terminal 1a or the positive electrode terminal 5a is exposed from the insulating film. The exposed portion of the wiring Lb is exposed to hydrogen sulfide (gas) generated from the single cell 10. Therefore, when hydrogen sulfide is generated from the single cell 10, the exposed portion of the wiring Lb is corroded by the hydrogen sulfide. As a result, the conductivity of the wiring Lb changes, and by detecting this change, it is possible to detect hydrogen sulfide generated from the single cell 10 without providing a sensor for detecting the concentration of the gas. Furthermore, if the exposed portion of the wiring Lb is thinner than the portions of the wiring La and wiring Lb covered with the insulating film, the effect of corrosion of the exposed portion by hydrogen sulfide becomes greater, which increases the change in conductivity of the exposed portion due to corrosion, making it easier to detect the gas generated from the cell 10.

[0050] According to the above embodiment, the cell 10 is a laminate-type all-solid-state battery in which the exterior member 20 is made of a laminate film, and the negative electrode terminal (negative electrode tab) 1a and the positive electrode terminal (positive electrode tab) 5a extend from the exterior member 20. Hydrogen sulfide generated in the cell 10 is likely to leak from the seal portion between the negative electrode terminal 1a and the positive electrode terminal 5a and the exterior member (laminate film) 20. The exposed portion of the wiring Lb adjacent to the negative electrode terminal 1a or the positive electrode terminal 5a is exposed to the gas leaking from the seal portion, and therefore the change in conductivity of the exposed portion due to corrosion becomes large, and the gas generated from the cell 10 can be detected well.

[0051] According to the above embodiment, when the ECU 150 detects that the exposed portion of the wiring Lb is corroded, using the voltage detection circuit 131 of the monitoring module 130 connected to the printed circuit board 60, the ECU 150 determines that hydrogen sulfide is being generated from the cell 10. This makes it possible to detect hydrogen sulfide being generated from the cell 10 by the voltage detection circuit 131 of the monitoring module 130 without providing a sensor for detecting the concentration of gas.

[0052] According to the above embodiment, the ECU 150 determines that hydrogen sulfide is being generated when the difference between the voltage VBa, which is the voltage of the cell 10 detected using the wire La, and the voltage VBb, which is detected using the wires La and Lb, is equal to or greater than a predetermined value A. This makes it possible to detect hydrogen sulfide generated from the cell 10 using the voltage detection circuit 131, and to execute various types of control such as battery control by adopting the voltage detected by the voltage detection circuit 131 using the wire La as the voltage value of each cell 10.

[0053] In the above embodiment, the voltage VBa and voltage VBb of each cell 10 are detected to detect the generation of hydrogen sulfide. The voltages of a plurality of cells 10 (e.g., 2 to 6 cells) connected in series may be detected in the same manner as in the above embodiment to detect the generation of hydrogen sulfide. Furthermore, the voltage of the battery module 50 (the voltage between busbar 52 and busbar 53) may be detected in the same manner as in the above embodiment to detect the generation of hydrogen sulfide.

[0054] In the above embodiment, the voltage detection circuit 131 detects the voltage of the cell 10 using a capacitor (flying capacitor) C, but the voltage of the cell 10 may be detected without using the capacitor C. In this case, the exposed portion of the wiring Lb may corrode, for example, increasing in resistance, and a voltage difference corresponding to that resistance may be detected. Also, instead of providing the switch S2, two voltage detection circuits may be provided, and each of the voltage detection circuits may detect the voltage VBa of the cell 10 and the voltage VBb of the cell 10.

[0055] In the above embodiment, an example has been described in which the battery pack 200 (battery module 50) is mounted on the vehicle 100. The battery pack 200 may be a stationary power storage device.

[0056] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present 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 of the claims. [Explanation of symbols]

[0057] 1 negative electrode collector layer, 1a negative electrode terminal, 2 negative electrode active material layer, 3 solid electrolyte layer, 4 positive electrode active material layer, 5 positive electrode collector layer, 5a positive electrode terminal, 7 insulating film, 8 all-solid-state battery element, 10 single cell, 15 all-solid-state battery laminate, 20 exterior member, 30 end plate, 50 battery module, 51, 52, 53 bus bars, 60 printed circuit board, 90 battery case, 100 vehicle, 110 driving drive unit, 120 HMI device, 125 MIL, 130 monitoring module, 131 voltage detection circuit, 140 hazard lamp, 150 control device (ECU), L1 voltage detection line, La, Lb wiring, S1, S2, So, Sh switches.

Claims

1. A battery including a sulfide-based all-solid-state battery housed in a battery case and including a first electrode terminal and a second electrode terminal; a printed circuit board including wiring connected to the first electrode terminal and the second electrode terminal, The printed circuit board is a first wiring connected to the first electrode terminal; a second wiring and a third wiring connected to the second electrode terminal; an insulating film covering the first wiring, the second wiring, and the third wiring; At least a portion of the third wiring is exposed from the insulating coating and is exposed to gas generated from the battery.

2. 2 . The battery pack according to claim 1 , wherein a thickness of the third wire at a portion exposed from the insulating coating is thinner than a thickness of a portion covered with the insulating coating.

3. The battery comprises: A power generating element formed of an all-solid-state battery laminate; an exterior member made of a laminate film that houses the power generating element and has a peripheral portion joined by thermal welding to seal the power generating element; The battery pack according to claim 1 , wherein the portion of the third wire that is exposed from the insulating coating is disposed adjacent to the second electrode terminal.

4. The battery pack according to any one of claims 1 to 3, A detection device connected to the printed circuit board; A control device, The control device includes: the battery system determining that the gas is being generated when the detection device detects that a portion of the third wiring that is exposed from the insulating coating is corroded.

5. the detection device is a voltage detection circuit for the battery, The control device includes:

5. The battery system of claim 4, wherein the gas is determined to be generated when a difference between a first battery voltage, which is the voltage of the battery detected using the first wiring and the second wiring, and a second battery voltage, which is the voltage of the battery detected using the first wiring and the third wiring, is greater than or equal to a predetermined value.

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