JP2009266563A - Energy storage device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an energy storage device capable of efficiently detecting gas discharge from a storage element, with cost hike restrained. <P>SOLUTION: The device includes a plurality of storage elements (11), a valve (60) fitted to each storage element for exhausting gas generated in the storage element, drain pipes (70) connected to the plurality of valves for guiding gas exhausted from each valve toward outside the storage device, and a gas sensor (80) for detecting gas. The gas sensor is arranged in the drain pipe at an area further downstream side of connecting parts with the plurality of valves in a gas exhaust channel. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a power storage device that can detect gas generated from a power storage element due to overcharge or the like.

  A secondary battery (unit cell) is generally composed of a power generation element having a function of charging and discharging, and a battery case that houses the power generation element. The power generation element includes, for example, a positive electrode body, a negative electrode body, and a separator.

  Here, if the secondary battery is overcharged, gas may be generated from the power generation element. Therefore, there are some which detect the generation of gas by detecting a pressure change in the battery case or detecting a temperature change in the power generation element. In addition, there is one that detects the generation of gas by detecting sound and vibration generated with the generation of gas (for example, see Patent Document 1).

On the other hand, there is one in which one exhaust duct is connected to a plurality of single cells, and a sensor for detecting gas emitted from the single cells is disposed inside the exhaust duct (for example, Patent Document 2).
JP 2002-8631 A (paragraph 0034) JP-A-8-255637 (paragraphs 0009, 0013, FIG. 1) JP 2004-247059 A

  However, when detecting a pressure change in the battery case or a temperature change of the power generation element, a sensor for detecting the pressure or temperature must be provided for each unit cell. Here, in an assembled battery in which a plurality of unit cells are electrically connected in series, the above-mentioned sensors must be prepared for the number of unit cells, resulting in an increase in cost.

  In addition, in the configuration for detecting sound and vibration, the detection accuracy may be reduced due to the influence of the external environment. For example, when an assembled battery equipped with a sensor for detecting sound or vibration is mounted on a vehicle, the sensor may also detect sound and vibration associated with the running of the vehicle. Will fall.

  On the other hand, in the configuration described in Patent Document 2, the position where the sensor for detecting the generation of gas is not specifically specified. Here, in FIG. 1 of patent document 2, the sensor is arrange | positioned in the area | region connected with the some single cell among the exhaust ducts. In such a configuration, the gas released from the unit cell may not be detected by the sensor depending on the positional relationship between the sensor and the unit cell.

  Here, with respect to the unit cell located on the upstream side of the gas discharge path with respect to the sensor, the gas released from the unit cell can be detected by the sensor. However, with respect to the unit cell located downstream of the gas discharge path with respect to the sensor, the gas released from the unit cell may be discharged through the exhaust duct without reaching the sensor. is there. In this case, the generation of gas cannot be detected by the sensor.

  Accordingly, an object of the present invention is to provide a power storage device including a plurality of power storage elements, capable of detecting gas generation even when gas is released from any one of the power storage elements while suppressing an increase in cost. To provide an apparatus.

  The power storage device according to the present invention includes a plurality of power storage elements, a valve provided in each power storage element for discharging gas generated in the power storage elements, and a gas connected to the plurality of valves and discharged from each valve An exhaust pipe for guiding the gas to the outside of the power storage device, and a gas sensor for detecting gas. And the gas sensor is arrange | positioned in the downstream area | region in the exhaust route of gas rather than the connection part with a some valve among exhaust pipes.

  Here, the exhaust pipe can be arranged so as to extend along the arrangement direction of the plurality of power storage elements. Further, when the exhaust pipe is branched into a plurality of parts according to the positions of the plurality of power storage elements, the gas sensor is located in a further downstream area from the branch point located on the most downstream side in the exhaust path of the gas in the exhaust pipe. Can be arranged. Thereby, even if gas is discharged from any of the plurality of power storage elements, the gas can be detected using one gas sensor. Therefore, the cost can be reduced as compared with the case of using a plurality of gas sensors.

  In addition, an electrical storage element can be comprised with the electric power generation element for charging / discharging, and the case where the electric power generation element was accommodated and the valve was provided. Examples of the power storage element include secondary batteries such as lithium ion batteries and nickel metal hydride batteries.

  The power storage device of the present invention can be mounted on a vehicle. In this case, a controller for switching the electrical connection between the power storage device and the electronic device between the connected state and the non-connected state is provided, and when the gas is detected by the gas sensor, the power storage device and the electronic device The connection can be disconnected. Accordingly, for example, further charging from the electronic device to the power storage device can be prohibited, and further generation of gas can be suppressed.

  According to the present invention, since the gas sensor is arranged in the downstream side of the exhaust pipe in the exhaust path of the gas from the connection portion with the plurality of valves, any one of the plurality of power storage elements. Even when the gas is discharged from the gas, the gas can be detected. Thereby, the number of gas sensors can be reduced and cost reduction can be aimed at.

  Examples of the present invention will be described below.

  First, the configuration of a battery pack (power storage device) that is Embodiment 1 of the present invention will be described with reference to FIG. Here, FIG. 1 is a perspective view showing an internal configuration of the battery pack of the present embodiment. The battery pack of this embodiment is mounted on a vehicle.

  Examples of the vehicle described above include a hybrid vehicle and an electric vehicle. A hybrid vehicle is a vehicle provided with other power sources such as an internal combustion engine and a fuel cell that output energy used for traveling of the vehicle in addition to the battery pack. An electric vehicle is a vehicle that travels using only the output of the battery pack. The battery pack according to the present embodiment outputs energy used for running the vehicle by discharging, or performs charging by receiving energy generated during braking of the vehicle or power supplied from outside the vehicle.

  The battery pack of the present embodiment includes the battery unit 1 shown in FIG. 1 and a pack case (not shown) that stores the battery unit 1. The battery unit 1 is fixed to the pack case, and the pack case is fixed to the vehicle body. Examples of the vehicle body include a floor panel and a frame. The pack case is preferably formed of a material excellent in durability and corrosion resistance. Specifically, a metal such as aluminum can be used as this material. In order to improve the heat dissipation of the battery pack (battery unit 1), a plurality of heat dissipating fins can be provided on the outer surface of the pack case.

  Further, the temperature of the battery unit 1 can be adjusted by supplying gas into the pack case. As this gas, for example, air existing in the interior of the vehicle, air existing outside the vehicle, or a gas having a component different from air can be used. Here, when the battery unit 1 is generating heat by charging and discharging, the battery unit 1 can be cooled by supplying gas (cooling gas) to the battery unit 1. Further, when the battery unit 1 is cooled by the influence of the external environment, the battery unit 1 can be warmed by supplying gas (heating gas) to the battery unit 1.

  On the other hand, the inside of the pack case can be filled with an insulating liquid, and the insulating liquid can be brought into contact with the battery unit 1. By using the liquid, the heat of the battery unit 1 can be easily released to the outside, or the heat from the outside can be easily transmitted to the battery unit 1.

  In the case of using an insulating liquid, it is necessary to keep the pack case sealed in order to prevent the liquid from leaking. As the insulating liquid, for example, insulating oil such as silicon oil can be used. An inert liquid can also be used instead of the insulating oil. This inert liquid is also a liquid having an insulating property, and specifically, fluorinate, Novec HFE (hydrofluoroether), and Novec 1230 (manufactured by 3M), which are fluorine-based inert liquids, can be used.

  Next, the structure of the battery unit 1 of a present Example is demonstrated.

  The battery unit 1 is composed of two battery modules 10. Each battery module 11 is composed of a plurality of single cells (storage element, secondary battery) 11 electrically connected in series by a bus bar, and these single cells 11 are arranged in one direction. . The two battery modules 10 are electrically connected in series by a bus bar.

  In each battery module 10, a spacer 20 is disposed between two adjacent unit cells 11 to guide the above-described gas to the side surface of the one unit cell 11 that faces the other unit cell 11. ing. The spacer 20 can be formed of an insulating material such as resin.

  Each battery module 11 is provided with a holding mechanism for holding the plurality of single cells 11 constituting the battery module 11 in a restrained state. The holding mechanism has a pair of end plates 30 disposed at both ends of the battery module 11 and a connecting member (not shown) for connecting the pair of end plates 30.

  Next, the configuration of the unit cell 11 will be described with reference to FIG. Here, FIG. 2 is a front view showing the configuration of the unit cell 11.

  In FIG. 2, the cell 11 includes a power generation element 11 a and a battery case 11 b that houses the power generation element 11 a. The battery case 11b is preferably formed of a material having excellent durability and corrosion resistance. Specifically, a metal such as aluminum can be used as this material. A safety valve 60 is provided on the upper surface of the battery case 11b. The configuration of the safety valve 60 will be described later. Further, an exhaust pipe 70 is connected to the upper surface of the battery case 11b so as to cover the safety valve 60. The configuration of the exhaust pipe 70 will be described later.

  A positive electrode terminal 11c and a negative electrode terminal 11d are connected to the power generation element 11a, and some of these terminals 11c and 11d protrude outside the battery case 11b. The positive electrode terminal 11c and the negative electrode terminal 11d in each unit cell 11 are electrically and mechanically connected to the positive electrode terminal 11c and the negative electrode terminal 11d in the other unit cell 11 by the bus bar 40 shown in FIG. Here, FIG. 3 is a view when a part of the battery module 11 is viewed from above.

  Next, the configuration of the power generation element 11a will be described with reference to FIG. Here, FIG. 4 is a cross-sectional view showing a schematic configuration of the power generation element 11a.

  A positive electrode layer (electrode layer) 52 is formed on one surface of the current collector 51, and a negative electrode layer (electrode layer) 53 is formed on the other surface. The electrode layers 52 and 53 and the current collector 51 constitute a bipolar electrode 54. The electrode layers 52 and 53 can be formed on the current collector 51 by using an inkjet method or the like. Each electrode layer 52, 53 contains an active material corresponding to the positive electrode and the negative electrode. Each electrode layer 52, 53 includes a conductive agent, a binder, an additive, an inorganic solid electrolyte for increasing ion conductivity, a polymer gel electrolyte, a polymer solid electrolyte, or the like as necessary.

  An electrolyte layer (separator) 55 is provided between the two bipolar electrodes 54. The electrolyte layer 55 is in contact with the positive electrode layer 52 in one bipolar electrode 54 and in contact with the negative electrode layer 53 in the other bipolar electrode 54. As described above, the bipolar electrode 54 and the electrolyte layer 55 are alternately laminated to constitute the power generation element 11a.

  In addition, although the power generation element 11a of the present embodiment has a laminated structure as shown in FIG. 4, the structure is not limited to this, and a configuration in which the bipolar electrode 54 is wound through the electrolyte layer 55 may be used.

  Here, an electrode layer (positive electrode layer 52 or negative electrode layer 53) is formed only on one surface of the current collector 51 located at both ends in the stacking direction (vertical direction in FIG. 4) of the power generation element 11a. Further, electrode terminals (positive terminal 11c and negative terminal 11d) for taking out current are electrically and mechanically connected to the other surface.

When a nickel metal hydride battery is used as the unit cell 11, nickel oxide is used as the active material of the positive electrode layer 52, and MmNi _(5-xyz) Al _x Mn is used as the active material of the negative electrode layer 53. A hydrogen storage alloy such as _y Co _z (Mm: Misch metal) can be used. Moreover, as the electrolyte layer 55, the thing which included the potassium hydroxide as electrolyte solution in the nonwoven fabric as a separator can be used.

  When a lithium ion battery is used as the unit cell 11, a lithium-transition metal composite oxide can be used as the active material of the positive electrode layer 52, and carbon can be used as the active material of the negative electrode layer 53. As the electrolyte layer 55, a separator in which a known organic electrolyte is included can be used. On the other hand, as the conductive agent, acetylene black, carbon black, graphite, carbon fiber, or carbon nanotube can be used.

  In this embodiment, as shown in FIG. 1, a case where a rectangular unit cell 11 is used will be described. However, the present invention is not limited to this, and a unit cell having another shape such as a cylindrical type can also be used. . In addition, an electric double layer capacitor can be used instead of the secondary battery.

  Further, in the present embodiment, the case where the bipolar electrode 54 is used has been described, but the present invention is not limited to this. For example, a positive electrode body in which a positive electrode layer is formed on both surfaces of a current collector and a negative electrode body in which a negative electrode layer is formed on both surfaces of the current collector can also be used. In this case, the positive electrode body and the negative electrode body are alternately arranged via the electrolyte layer.

  The current collector 51 can be formed of, for example, an aluminum foil or a plurality of metals (alloys). In addition, a metal (excluding aluminum) whose surface is covered with aluminum can be used as the current collector 51.

  As the current collector 51, a so-called composite current collector in which a plurality of metal stays are bonded together can be used. In the case of using this composite current collector, aluminum or the like can be used as the material for the positive electrode current collector, and nickel, copper, or the like can be used as the material for the negative electrode current collector. In addition, as the composite current collector, one in which the positive electrode current collector and the negative electrode current collector are in direct contact is used, or a conductive layer is provided between the positive electrode current collector and the negative electrode current collector. The provided one can be used.

  Next, the structure of the safety valve 60 provided in the battery case 11b of the unit cell 11 will be described with reference to FIG.

  As will be described later, the safety valve 60, when a gas is generated from the power generation element 11a when the unit cell 11 is abnormal (for example, at the time of overcharge), this gas is supplied to the outside of the unit cell 11, in other words, to the exhaust pipe 70. Used to release. Specifically, the safety valve 60 includes an exterior member 61 in which an opening 61a is formed, a lid member 62 for opening and closing the opening 11b1 formed in the battery case 11b, and the lid member 62 on the opening 11b1 side. And an urging member (spring) 63 for urging the lens.

  The exterior member 61 is fixed to the outer surface of the battery case 11b. The biasing member 63 has one end fixed to the lid member 62 and the other end fixed to the inner surface of the exterior member 61. The lid member 62 is formed of a member that can be elastically deformed so as to be in close contact with the outer surface of the battery case 11b.

  In the state shown in FIG. 5, the lid member 62 is in close contact with the battery case 11b and closes the opening 11b1. That is, the safety valve 60 is in a closed state. Thereby, the inside of the battery case 11b is hermetically sealed. Here, the size of the lid member 62 (the length in the left-right direction in FIG. 5) is larger than the size of the opening 11b1 (the length in the left-right direction in FIG. 5), and the size of the exterior member 61 (FIG. 5). The length in the left-right direction) is smaller.

  Further, the urging force by the urging member 63 can move in a direction in which the lid member 62 moves away from the opening 11b1 when the internal pressure of the battery case 11b accompanying the generation of gas reaches a predetermined value, as will be described below. Can be set as follows. When the lid member 62 moves in a direction away from the opening 11b1, the safety valve 60 is opened.

  Specifically, the urging force of the urging member 63 can be set based on the amount (predicted value) of gas that can be generated from the power generation element 11a. For example, when the internal pressure of the battery case 11b rises to 10 atm with the generation of gas, the safety valve 60 can change from the closed state to the open state when it reaches 5 atm (set value). be able to.

  The safety valve 60 of the present embodiment is in an open state when the internal pressure of the battery case 11b is equal to or higher than a predetermined value, and is in a closed state when the internal pressure of the battery case 11b is lower than a predetermined value. And the safety valve 60 changes between an open state and a closed state according to the internal pressure of the battery case 11. Such a configuration is called a so-called return type valve.

  Note that the safety valve 60 can also be configured as a so-called destructive valve instead of a return-type valve. Here, the destructive valve refers to a valve that changes irreversibly from a closed state to an open state.

  Specifically, as the destructive valve, a groove (including a notch) can be formed on the outer surface of the battery case 11b. By forming the groove portion, the thickness of the battery case 11b is thinner than other portions in the portion where the groove portion is formed, and the gas generated inside the battery case 11b can be released to the outside. Here, dimensions such as the size and depth of the groove may be appropriately set according to the internal pressure (set value) of the battery case 11b when the valve is changed from the closed state to the open state.

  In this embodiment, the safety valves 60 are provided for all the cells 11 constituting the battery module 10, but the present invention is not limited to this, and the safety valves 60 are provided for at least two cells 11. May be. Even in this case, with respect to at least two unit cells 11, gas can be released to the outside of the unit cells 11.

  On the other hand, an exhaust pipe 70 is connected to the battery case 11b. Specifically, as shown in FIG. 2, the exhaust pipe 70 is arranged so as to cover the safety valve 60 provided in each unit cell 11, and the gas released from the safety valve 60 is guided only to the exhaust pipe 70. It has come to be. That is, the exhaust pipe 70 is fixed to the unit cell 11 so that the gas released from the safety valve 60 does not leak out of the exhaust pipe 70.

  In this embodiment, the exhaust pipe 70 is fixed to the battery case 11b. However, the present invention is not limited to this. That is, any configuration may be used as long as the gas released from the safety valve 60 can be guided only to the exhaust pipe 70. For example, a tube that covers the safety valve 60 may be provided on the upper surface of the battery case 11 b, and this tube may be connected to the exhaust pipe 70. In this embodiment, the safety valve 60 is provided on the upper surface of the battery case 11b. However, the safety valve 60 may be provided at another position.

  The exhaust pipe 70 is provided for each battery module 10 and extends in the direction in which the plurality of single cells 11 constituting each battery module 11 are arranged as shown in FIG. In this embodiment, since the battery unit 1 is composed of two battery modules 10, two exhaust pipes 70 are provided.

  As shown in FIG. 6, the two exhaust pipes 70 are connected to each other to form one exhaust pipe. In other words, the exhaust pipe 70 has a branched structure corresponding to the two battery modules 10. And when gas is discharged | emitted from the cell 11 in the two battery modules 10, after these gas merges, it will pass through the one exhaust pipe 70. FIG.

  The single exhaust pipe 70 extends to the outside of the vehicle, and discharges the gas generated in the unit cell 11 to the outside of the vehicle. Here, the exhaust pipe 70 penetrates the pack case that houses the battery unit 1, a part of the exhaust pipe 70 is located inside the pack case, and the other part of the exhaust pipe 70 is the pack. Located outside the case. Moreover, the arrow shown with the dotted line of FIG. 6 has shown the moving direction (exhaust path | route) of gas. Here, in practice, there is a gas component that travels in a direction different from the arrow indicated by the dotted line in FIG. 6, but the main gas flow is the arrow indicated by the dotted line in FIG. 6. A safety valve 60 is located on the upstream side (left side in FIG. 6) of the gas movement path.

  A gas sensor 80 for detecting gas flowing through the exhaust pipe 70 is provided at a connection portion between the two exhaust pipes 70. Here, the configuration of the gas sensor 80 will be described with reference to FIG.

  In this embodiment, a gas sensor having a crystal resonator is used as the gas sensor 80.

  The crystal resonator 81 has a crystal plate 82 and electrodes 83 formed on both surfaces of the crystal plate 82. The crystal resonator 81 is electrically connected to the oscillation circuit 84 and vibrates at a specific oscillation frequency. The crystal resonator 81 is covered with a sensitive film 85 for adsorbing gas. As the sensitive membrane 85, for example, a lipid membrane can be used. And the kind of gas to adsorb | suck and the amount of adsorption | suction can be changed according to the molecular structure of a lipid membrane, a membrane structure, and the coating amount. That is, as the structure of the sensitive film 85, a material capable of adsorbing the gas generated from the unit cell 11 may be selected.

  When a lithium ion battery is used as the unit cell 11, an organic solvent is generally used as the electrolytic solution, and an aromatic component such as a carbonate ester or a fatty acid ester is included. When this electrolytic solution is thermally decomposed, oxygen, carbon monoxide, and carbon dioxide are generated. For this reason, as the sensitive film | membrane 85, what can adsorb | suck the gas mentioned above can be selected.

  The crystal resonator 81 vibrates at a predetermined cycle in a normal state where no gas is adsorbed. Here, when the sensitive film 85 adsorbs the gas, the frequency of the crystal unit 81 changes due to a change in mass. Since the change in mass due to gas adsorption and the amount of change in the oscillation frequency in the crystal resonator 81 are in a proportional relationship, the change in gas concentration can be measured by using this relationship.

  The gas sensor 80 is not limited to a gas sensor using a crystal resonator, and may have any configuration as long as it can detect a specific gas released from the unit cell 11. For example, a gas sensor using a semiconductor can be used. In this semiconductor gas sensor, a metal oxide semiconductor is used, and gas can be detected by measuring a change in electrical conductivity of the semiconductor accompanying gas adsorption.

  Next, a part of the circuit configuration in the vehicle including the battery pack of the present embodiment will be described with reference to FIG.

  The battery pack 100 (the positive electrode and the negative electrode of the battery unit 1) is connected to the inverter 102 via the system relays 101a and 101b, and when the system relays 101a and 101b are turned on, a predetermined power is supplied to the inverter 102. Supply. Here, a DC / DC converter may be disposed between the battery pack 100 and the inverter 102. As a result, the voltage of the battery pack 100 can be supplied to the inverter 102 while being boosted.

  The inverter 102 is electrically connected to the traveling motor 103, and drives the traveling motor 103 using the output from the battery pack 100. Thereby, the vehicle of the present embodiment can travel using the driving force of the travel motor 103.

  Based on the output of the gas sensor 80, the controller 90 determines whether or not gas is generated from any single cell 11 in the battery unit 1. Here, when gas is generated from the unit cell 11, the controller 90 outputs the control signal to the system relays 101a and 101b, thereby switching the system relays 101a and 101b from on to off. Thereby, the electrical connection between the battery pack 100 and the inverter 102 is interrupted.

  In the present embodiment, the gas sensor 80 is disposed at the connection portion of the two exhaust pipes 70 extending from each battery module 10. For this reason, even if gas is discharged from any single cell 11 of the battery module 10, this gas passes through the gas sensor 80. That is, by using only one gas sensor 80, this gas can be detected even if gas is released from any of the plurality of unit cells 11 constituting the battery unit 1. Thereby, the number of gas sensors 80 can be reduced to the minimum number (one), and the cost can be reduced as compared with the case where a plurality of gas sensors 80 are used.

  In the present embodiment, as shown in FIG. 6, the gas sensor 80 is disposed at a location where the two exhaust pipes 70 are connected, but the present invention is not limited to this. That is, the gas sensor 80 may be disposed in a region downstream of the gas exhaust path from the location where the two exhaust pipes 70 are connected.

  In this embodiment, two exhaust pipes 70 are provided for the two battery modules 10 constituting the battery unit 1 and these exhaust pipes 70 are connected to each other. However, the present invention is not limited to this. That is, the present invention can also be applied when the battery unit 1 is configured by one battery module 10 or when the battery unit 1 is configured by arranging three or more battery modules 10 in parallel.

  When the battery unit 1 is composed of one battery module 10, one exhaust pipe 70 is used. In this case, the gas sensor 80 can be provided at a position on the downstream side in the gas discharge path from the portion of the single exhaust pipe 70 connected to the plurality of safety valves 60 in the battery module 10. Thus, even when gas is released from any one of the plurality of safety valves 60, the gas sensor 80 can efficiently detect the generation of gas.

  When the battery unit 1 is composed of three or more battery modules 10, an exhaust pipe 70 is provided for each battery module 10, and these exhaust pipes 70 are connected to form one exhaust pipe 70. be able to. In other words, the exhaust pipe 70 can be branched corresponding to three or more battery modules 10. Here, when three or more exhaust pipes 70 are connected, three or more exhaust pipes 70 may be connected together at one place to form one exhaust pipe 70, It is also possible to make one exhaust pipe 70 finally by changing the connection point. In other words, the exhaust pipe 70 can be branched into three or more at one branch point, or can be branched into a plurality at a plurality of branch points.

  In this case, the gas sensor 80 may be disposed in a region where one exhaust pipe 70 is finally formed. In other words, the gas sensor 80 may be disposed in a region from the branch point closest to the exhaust port side to the exhaust port in the exhaust pipe 70. Thereby, even if gas is discharged from any single cell 11, the gas can be detected by using one gas sensor 80.

It is an external view which shows the structure of a battery unit. It is a front view which shows the structure of a cell. It is a figure when a part of battery module is seen from the upper part. It is sectional drawing which shows the structure of an electric power generation element. It is sectional drawing which shows the structure of a safety valve. It is a figure for demonstrating the shape of an exhaust pipe, and the position of a gas sensor. It is a figure which shows the structure of a gas sensor. It is a block diagram which shows the structure in a part of vehicle.

Explanation of symbols

1: Battery unit 10: Battery module 11: Single battery (storage element)
60: Safety valve 70: Exhaust pipe 80: Gas sensor

Claims (6)

A plurality of power storage elements;
A valve provided in each of the electricity storage elements for discharging gas generated in the electricity storage element;
An exhaust pipe connected to the plurality of valves for guiding the gas discharged from the valves to the outside of the power storage device;
A gas sensor for detecting the gas,
The power storage device according to claim 1, wherein the gas sensor is disposed in a region of the exhaust pipe downstream of a connection portion with the plurality of valves in the gas exhaust path.   The power storage device according to claim 1, wherein the exhaust pipe extends along an arrangement direction of the plurality of power storage elements. The exhaust pipe is branched into a plurality according to the positions of the plurality of power storage elements,
3. The power storage device according to claim 1, wherein the gas sensor is arranged in a region further downstream from a branch point located on the most downstream side in the exhaust path of the gas in the exhaust pipe. .   The said electrical storage element has a power generation element for performing charging / discharging, and the case in which the said power generation element was accommodated, and the said valve | bulb was provided, The Claim 1 characterized by the above-mentioned. Power storage device.   A vehicle comprising the power storage device according to any one of claims 1 to 4. A controller for switching an electrical connection between the power storage device and the electronic device between a connected state and a disconnected state;
The vehicle according to claim 5, wherein when the gas is detected by the gas sensor, the controller puts the power storage device and the electronic device into a disconnected state.

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