Power storage module

Abstract

A power storage module (10) comprises at least one power storage device (20), a case (40) that accommodates the at least one power storage device (20), a cooling liquid (50) in which the at least one power storage device (20) is immersed inside the case (40), and a switching device (60) for switching between a state in which a gas that is inside the case (40) is discharged from the case 40 and a state in which the cooling liquid (50) is collected from the gas.

Description

Energy storage module

[0001] The present disclosure relates to an energy storage module.

[0002] An electric storage module is used as a power source having a plurality of electric storage devices. The electric storage module may include a plurality of electric storage devices, a case for accommodating the plurality of electric storage devices, and a coolant for immersing the plurality of electric storage devices within the case (see, for example, Patent Document 1).

[0003] Patent No. 6256439

[0004] There is a demand for further improvements in the reliability of energy storage modules.

[0005] The energy storage module according to the present disclosure is characterized by comprising at least one energy storage device, a case in which the at least one energy storage device is housed, a coolant in which the plurality of energy storage devices are immersed within the case, and a switching device that switches between a first state in which gas within the case is exhausted from the case and a second state in which the coolant contained in the gas is collected.

[0006] According to the energy storage module of the present disclosure, reliability can be improved.

[0007] Fig. 1 is a side cross-sectional view showing an energy storage module as an example of an embodiment; Fig. 2 is a side cross-sectional view showing an energy storage device as an example of an embodiment; Fig. 3 is a block diagram showing the configuration of a control device; Fig. 4 is a flow chart showing the flow of switching control; Fig. 5 is a side cross-sectional view showing a state of a switching device in a normal state; Fig. 6 is a side cross-sectional view showing a state of a switching device in a second state; Fig. 7 is a side cross-sectional view showing a state of a switching device in a first state; Fig. 8 is a side cross-sectional view showing an energy storage module as another example of an embodiment;

[0008] An example of an embodiment of the present disclosure will be described in detail below. In the following description, specific shapes, materials, directions, numerical values, etc. are examples for facilitating understanding of the present disclosure, and can be appropriately changed according to the application, purpose, specifications, etc.

[0009] [Overall Configuration of Energy Storage Module] An energy storage module 10 as an example of an embodiment will be described with reference to FIG.

[0010] The power storage module 10 is mounted on an electric vehicle as a power source for the motor that drives the electric vehicle. However, the power storage module of the present disclosure is not limited to being mounted on an electric vehicle, and may be used as a power source for motor-driven electric devices such as power tools, power-assisted bicycles, electric motorcycles, electric wheelchairs, electric tricycles, and electric carts. Furthermore, the use of the power storage module of the present disclosure is not limited, and may be used as a power source for various electric devices used indoors and outdoors, such as vacuum cleaners, radios, lighting devices, digital cameras, and video cameras.

[0011] The energy storage module 10 includes a plurality of energy storage devices 20, a case 40 that houses the plurality of energy storage devices 20, a coolant 50 that immerses the plurality of energy storage devices 20 inside the case 40, and a switching device 60 that switches between a state in which gas inside the case 40 is exhausted from the case 40 when an abnormality occurs in the energy storage device 20 (for example, when the energy storage device 20 generates heat), and a state in which the coolant 50 contained in the gas is recovered into the case 40.

[0012] The multiple power storage devices 20 may be packed as densely as possible within the power storage module 10 while taking safety into consideration, and adjacent power storage devices 20 may be arranged in close proximity to each other. For example, the power storage devices 20 may be arranged such that six power storage devices 20 surround one power storage device 20 in a plan view (or arranged in a staggered pattern). Alternatively, the multiple power storage devices 20 may be arranged such that the power storage devices 20 closest to each other are located on all four sides. Details of the power storage devices 20 will be described later.

[0013] The upper side of the power storage device 20 is held by an upper holder 31. The upper holder 31 is made of, for example, a thermoplastic resin. Thermoplastic resins are broadly classified into general-purpose plastics and engineering plastics, and examples thereof include polyethylene, polypropylene, polyamide, and ABS.

[0014] A positive current collector plate 33 is disposed on the upper surface of the upper holder 31. The positive current collector plate 33 is a member that connects positive terminals serving as first electrode terminals of the power storage device 20, which will be described later. The positive current collector plate 33 is immersed in the coolant 50 inside the case 40. The positive current collector plate 33 is formed from a metal plate having electrical conductivity.

[0015] The lower side of the power storage device 20 is held by a lower holder 32. The lower holder 32 is made of, for example, a thermoplastic resin. Thermoplastic resins are broadly classified into general-purpose plastics and engineering plastics, and polyethylene, polypropylene, polyamide, ABS, etc. are used.

[0016] A negative current collector 34 is disposed on the lower surface of the lower holder 32. The negative current collector 34 is a member that connects negative terminals serving as second electrode terminals of the power storage device 20, which will be described later. The negative current collector 34 is immersed in the coolant 50 inside the case 40. The negative current collector 34 is formed of a conductive metal plate. Note that, in FIG. 1 , the positive current collector 33 and the negative current collector 34 are disposed in the upper holder 31 and the lower holder 32, respectively, but these current collectors may be disposed in one of the holders and connected to the power storage device 20.

[0017] As described above, the case 40 houses a plurality of power storage devices 20. The case 40 is made of a metal such as aluminum or a resin, and is formed into a substantially rectangular parallelepiped shape. The case 40 can protect the power storage devices 20 housed therein from dust and water.

[0018] As described above, the coolant 50 immerses the plurality of power storage devices 20 inside the case 40. In the power storage module 10, the coolant 50 can cool the power storage devices 20. This can improve the reliability of the power storage module 10. The coolant 50 has insulating properties. This can prevent current leakage from one power storage device 20 to another power storage device 20 via the coolant 50. The coolant 50 may be, for example, insulating oil, transformer oil, silicone oil, or a fluorine-based inert liquid such as hydrofluoroether.

[0019] As described above, the switching device 60 switches between a first state in which gas is exhausted from the case 40 when an abnormality occurs in the power storage device 20, and a second state in which the coolant 50 contained in the gas is collected. The switching device 60 is provided above the case 40. The switching device 60 will be described in detail later.

[0020] [Power Storage Device] The power storage device 20 as an example of an embodiment will be described with reference to FIG.

[0021] In this embodiment, the power storage device 20 is a cylindrical lithium-ion secondary battery, but may also be a nickel-metal hydride battery, a capacitor, or the like. The power storage device 20 includes an electrode group 24, for example, a band-shaped positive electrode 21 and a band-shaped negative electrode 22 wound together with a band-shaped separator 23 interposed therebetween; a cylindrical outer can 25 that houses the electrode group 24 together with an electrolyte; a sealing member 26 that insulates and seals an opening at one axial end of the outer can 25; a foil-shaped positive electrode tab 27 that electrically connects the positive electrode 21 to the sealing member 26; and a negative electrode tab 28 that electrically connects the negative electrode 22 to the outer can 25. An insulating gasket 29 may be disposed between the outer periphery of the sealing member 26 and the inner circumferential surface of the opening of the outer can 25. Note that the outer casing of the power storage device of the present disclosure is not limited to the cylindrical outer can 25. A rectangular outer can or a pouch-shaped outer casing may also be used.

[0022] An annular groove 25A is formed on the outer peripheral surface of the outer can 25, on the opening side. This groove 25A is formed as an annular protrusion on the inner peripheral surface of the outer can 25. The gasket 29 and sealing body 26 are disposed on this annular protrusion within the outer can 25. Furthermore, the opening end of the outer can 25 is crimped so as to bend toward the inside of the outer can 25, with the gasket 29 disposed on the inner peripheral side. The crimped opening end and the protrusion sandwich the sealing body 26 in the axial direction via the gasket 29, thereby sealing the opening of the outer can 25.

[0023] The sealing body 26 is provided with a current interrupter (CID) or a safety valve that ruptures when the pressure inside the outer can 25 reaches or exceeds the operating pressure. An insulating plate 30 is provided between the electrode group 24 and the bottom surface 25B of the outer can 25 or between the electrode group 24 and the protrusion (groove 25A) to insulate the electrode group 24 from the outer can 25. The positive electrode tab 27 extends through a through-hole formed in the insulating plate 30. The negative electrode tab 28 may extend through a through-hole formed in the insulating plate 30 or may extend around the insulating plate 30.

[0024] In the energy storage device 20, a positive electrode terminal as a first electrode terminal is provided on the top surface of the sealing body 26, and a negative electrode terminal as a second electrode terminal is provided on the bottom surface 25B of the outer can 25. A positive electrode lead of a positive electrode current collector 33 is joined by welding to the top surface of the sealing body 26, which is the positive electrode terminal as the first electrode terminal. A negative electrode lead of a negative electrode current collector 34 is joined by welding to the bottom surface 25B of the outer can 25, which is the negative electrode terminal as the second electrode terminal.

[0025] [Switching Device] A switching device 60 as an example of an embodiment will be described with reference to FIGS. 1 to 7. FIG.

[0026] As described above, the switching device 60 switches between a first state in which gas is exhausted from the case 40 when an abnormality occurs in the storage device 20, and a second state in which the coolant 50 contained in the gas is recovered into the case 40.

[0027] Here, abnormality of the power storage device 20 includes thermal runaway of the power storage device 20. Thermal runaway of the power storage device 20 includes a state in which the exhaust valve of at least one power storage device 20 is activated (hereinafter referred to as a first state), and a state in which the exhaust valve of at least one power storage device 20 is not activated but the power storage device 20 is at a high temperature (hereinafter referred to as a second state). The normal state refers to a state in which all power storage devices 20 are normal. The first and second states are determined by the pressure inside the case 40 and are not necessarily determined by the temperature of the power storage device 20. The state before the power storage device 20 experiences thermal runaway may also be defined as the first state.

[0028] In addition, the gases exhausted from the case 40 when the storage device 20 experiences thermal runaway include coolant 50 that has evaporated in a high-temperature, high-pressure environment when the storage device 20 reaches a high temperature, coolant 50 that has become mist (atomized liquid) in a high-temperature, high-pressure environment, and foreign matter and high-temperature gases inside the storage device 20 that have been exhausted into the inside of the case 40 when the exhaust valve of the storage device 20 is activated.

[0029] As will be described in detail later, in the first state, the switching device 60 can exhaust gas from the case 40 and exhaust foreign matter and high-temperature gas inside the power storage device 20 to the outside of the case 40 through the exhaust port 61. This can improve the reliability of the power storage module 10.

[0030] Furthermore, as will be described in detail later, in the second state, the switching device 60 can recover the mist of coolant 50 contained in the gas inside the case 40 (or collect it within the power storage module 10). This can minimize the loss of coolant 50 contained in the gas. As a result, the power storage module 10 can ensure its function of preventing fire from spreading and leaking from the power storage device 20. This can improve the reliability of the power storage module 10.

[0031] 1 and 3, the switching device 60 is provided in the case 40 and includes an exhaust port 61 for exhausting gas from the case 40, a recovery path 62 for collecting the coolant 50 contained in the gas and recovering it through a recovery port 67 into the case 40, a switching valve 63 for switching between a state in which the exhaust port 61 is connected to the outside of the case 40 and a state in which the exhaust port 61 is connected to the recovery path 62, a pressure sensor 64 as a pressure detector for detecting the pressure inside the case 40, a mesh-like collecting member 65 arranged in the recovery path 62 for collecting the coolant 50, a blower 66 for blowing air in a direction to recover the coolant 50 into the case 40, and a control device 70 for controlling the switching of the switching valve 63 and the operation of the blower 66. Note that the blower 66 in FIG. 1 and in FIGS. 5 to 8 described below is illustrated with its rotation axis aligned vertically to the plane of the drawing, but this is a conceptual illustration, and in reality the rotation axis is aligned along the extension direction of the recovery path 62.

[0032] As shown in FIG. 1 , exhaust port 61 is provided in case 40 and exhausts gas from case 40 in the event of thermal runaway of power storage device 20. When power storage device 20 is in a first state, exhaust port 61 exhausts gas inside case 40 to the outside of case 40. When power storage device 20 is in a second state, exhaust port 61 exhausts mist-like coolant 50 inside case 40 to recovery path 62. When power storage device 20 is in the first state, exhaust port 61 can prevent the inside of case 40 from becoming high pressure and causing case 40 to burst. When coolant 50 decreases, exhaust port 61 can replenish coolant 50 through exhaust port 61.

[0033] A pressure release valve may be provided in the exhaust port 61. The pressure release valve is a valve that opens when the pressure inside the case 40 is equal to or greater than a set pressure value. The pressure release valve allows gas to be exhausted from the case 40 only when high pressure is generated inside the case 40 during thermal runaway of the power storage device 20. The pressure release valve may be, for example, a membrane that can exhaust only gas. The pressure release valve may be, for example, a waterproof, breathable membrane.

[0034] When the power storage device 20 is in the second state, the recovery path 62 collects the mist of coolant 50 contained in the gas and recovers it inside the case 40. The recovery path 62 is formed as a duct that connects the exhaust port 61 and the recovery port 67 on the top surface of the case 40. The recovery path 62 also has an inclined portion 62A that slopes downward to the recovery port 67. The inclined portion 62A allows the collected coolant 50 to flow downward by gravity.

[0035] The switching valve 63 switches between a state in which the exhaust port 61 communicates with the outside of the case 40 and a state in which the exhaust port 61 communicates with the recovery path 62, depending on whether the power storage device 20 is in a first state or a second state. More specifically, the switching valve 63 is a damper-type on-off valve, and switches between a state in which the exhaust port 61 communicates with the outside of the case 40 by blocking the exhaust port 61 from the recovery path 62, and a state in which the exhaust port 61 communicates with the recovery path 62 by blocking the exhaust port 61 from the outside of the case 40. The switching valve 63 is connected to the control device 70, and is switched by a signal from the control device 70.

[0036] More specifically, when the pressure inside the case 40 detected by a pressure sensor 64 described later is equal to or higher than a first pressure, the switching valve 63 connects the exhaust port 61 to the outside of the case 40, and when the pressure inside the case 40 is lower than the first pressure, the switching valve 63 connects the exhaust port 61 to the recovery path 62. The first pressure may be set to be substantially the same as the pressure at which the exhaust valve of the above-described power storage device 20 operates. Note that the first pressure may be different from the operating pressure of the exhaust valve of the power storage device 20.

[0037] Although details will be described later, in the first state, the switching valve 63 can exhaust foreign matter and high-temperature gas inside the power storage device 20 from the exhaust port 61 to the outside of the case 40 (see FIG. 7 ). In addition, in the second state, the switching valve 63 can collect the mist-like coolant 50 and recover it from the recovery path 62 (see FIG. 6 ).

[0038] The pressure sensor 64 serving as a pressure detector detects the pressure inside the case 40. The pressure sensor 64 is connected to the control device 70 and transmits the detected pressure value to the control device 70.

[0039] The collection member 65 collects the coolant mist 50. The collection member 65 is disposed inside the recovery path 62. The material of the collection member 65 may be resin, metal, or ceramic. Specific examples of the material include glass fiber, glass wool, and polyvinylidene fluoride resin. The shape of the collection member 65 may be porous, mesh, or felt. The collection member 65 is formed in a cylindrical shape. This reduces the resistance that the collection member 65 provides when the coolant mist 50 passes through the recovery path 62.

[0040] The blower 66 blows air in a direction that collects the coolant mist 50 in the case 40. The blower 66 can promote the collection of the coolant mist 50. The blower 66 is connected to the control device 70 and is driven by a signal from the control device 70. More specifically, the blower 66 is driven when the pressure inside the case 40 detected by the pressure sensor 64 is equal to or greater than the second pressure and less than the first pressure. The second pressure is set to a pressure slightly greater than atmospheric pressure. Here, the normal state described above refers to a state in which the pressure inside the case 40 is lower than the second pressure. The blower 66 can promote the collection of the coolant 50 through the collection path 62 in the second state.

[0041] 3, the control device 70 is a computer including a CPU 71, which is a processor that performs information processing, and a memory 72 that stores data. The memory 72 stores a control program 73 and control program data 74. Note that the memory 72 may also store other programs and databases.

[0042] The control program 73 switches the switching valve 63 and drives the blower 66 in accordance with the pressure detected by the pressure sensor 64. The control program 73 is executed by the CPU 71. The control program data 74 temporarily stores data when the CPU 71 executes the control program 73, and also stores setting values ​​and the like required for executing the control program 73. The operation of the control device 70 is realized by the CPU 71 executing the control program 73.

[0043] [Switching Control] The operation (switching control) of the control device 70 will be described with reference to FIGS.

[0044] As shown in FIG. 3, in step S11, the CPU 71 causes the pressure detected by the pressure sensor 64 to be less than the second pressure, the pressure inside the case 40 to be close to atmospheric pressure, and all the storage devices 20 to be in a normal state (normal state), so the CPU 71 causes the switching valve 63 to connect the exhaust port 61 to the recovery path 62, and stops the blower 66 (see FIG. 5).

[0045] In step S12, the CPU 71 checks whether the pressure detected by the pressure sensor 64 is equal to or greater than the second pressure. If the CPU 71 determines YES in step S12, the CPU 71 proceeds to step S13. If the CPU 71 determines NO in step S12, the CPU 71 returns to step S11.

[0046] In step S13, the CPU 71 drives the blower 66 while keeping the exhaust port 61 and the recovery path 62 in communication with each other via the switching valve 63, because the exhaust valve of at least one storage device 20 is not operating but the storage device 20 is in a high-temperature state (second state) and the coolant 50 has turned into a mist in the high-temperature and high-pressure environment inside the case 40 (see Figure 6).

[0047] As a result, the cooling liquid 50 in mist form is sent to the recovery path 62 by driving the blower 66, and the collection of the cooling liquid 50 in mist form is promoted by the collection member 65, thereby minimizing the loss of the cooling liquid 50.

[0048] In step S14, the CPU 71 checks whether the pressure detected by the pressure sensor 64 is equal to or greater than the first pressure. If the CPU 71 determines YES in step S14, the CPU 71 proceeds to step S15. If the CPU 71 determines NO in step S14, the CPU 71 returns to step S12.

[0049] In step S15, because the exhaust valve of at least one power storage device 20 is activated and foreign matter and high-temperature gas inside the power storage device 20 is being discharged into the inside of the case 40 (first state), the CPU 71 causes the switching valve 63 to communicate between the exhaust port 61 and the outside of the case 40 and stops the blower 66 (see FIG. 7 ). This allows the foreign matter and high-temperature gas inside the power storage device 20 to be discharged from the exhaust port 61 to the outside of the case 40.

[0050] The CPU 71 passes through step S15 and returns to step S14 again. At this time, if the pressure detected by the pressure sensor 64 becomes less than the second pressure, the CPU 71 returns to step S13 via step S12, and drives the blower 66 while the switching valve 63 keeps the exhaust port 61 and the recovery path 62 in communication with each other.

[0051] Another Embodiment A power storage module 110 as another example of the embodiment will be described with reference to FIG. 8 .

[0052] In the following, like reference numerals are used to designate components common to the above-described power storage module 10, and descriptions thereof will be omitted. The power storage module 110 includes a plurality of switching devices 60. In the example shown in Fig. 8, the power storage module 110 includes two switching devices 60, but may include two or more switching devices 60. Furthermore, each switching device 60 is provided with a common recovery port 67.

[0053] [Summary] The present disclosure is further described by the following embodiments. Configuration 1: An energy storage module comprising: at least one power storage device; a case that houses the at least one power storage device; a coolant that immerses the plurality of power storage devices within the case; and a switching device that switches between a first state in which gas within the case is exhausted from the case and a second state in which the coolant contained in the gas is collected. Configuration 2: The energy storage module according to configuration 1, wherein the switching device is provided in the case and comprises: an exhaust port that exhausts the gas; a collection path that collects the coolant contained in the gas; and a switching valve that switches between the first state and the second state, wherein in the first state, the switching valve connects the exhaust port to the outside of the case, and in the second state, the switching valve connects the exhaust port to the collection path. Configuration 3: The energy storage module according to configuration 2, further comprising a pressure detector that detects pressure inside the case, wherein the switching valve is switched to the first state when the pressure detected by the pressure detector is equal to or greater than a first pressure. Configuration 4: The energy storage module according to configuration 3, wherein the first pressure is set to be substantially the same as a pressure at which an exhaust valve of at least one of the energy storage devices operates. Configuration 5: The energy storage module according to configuration 3 or 4, wherein the switching valve is switched to a state in which the exhaust port and the recovery path communicate with each other when the pressure detected by the pressure detector is less than the first pressure and is a second pressure. Configuration 6: The energy storage module according to any of configurations 3 to 5, wherein a collection member that collects the coolant is disposed in the recovery path. Configuration 7: The energy storage module according to any of configurations 2 to 6, wherein the recovery path has a recovery port that communicates with the inside of the case. Configuration 8: The energy storage module according to configuration 7, wherein the recovery path slopes downward to the recovery port.Configuration 9: The energy storage module according to any one of configurations 2 to 8, wherein the recovery path is provided with a blower that blows air in a direction to recover the coolant into the case. Configuration 10: The energy storage module according to configuration 9, wherein the blower is driven when the pressure is equal to or greater than the second pressure and less than the first pressure. Configuration 11: The energy storage module according to configuration 10, wherein the second pressure is greater than atmospheric pressure. Configuration 12: The energy storage module according to any one of configurations 2 to 11, wherein the exhaust port is blocked by a waterproof / breathable membrane. Configuration 13: The energy storage module according to any one of configurations 7 to 12, comprising a plurality of the switching devices. Configuration 14: The energy storage module according to configuration 13, wherein the recovery paths of the plurality of switching devices each have the common recovery port. Configuration 15: The electricity storage module according to any one of Configurations 6 to 14, wherein the material of the collection member is glass fiber, glass wool, or polyvinylidene fluoride resin.

[0054] It should be noted that the present disclosure is not limited to the above-described embodiments and their variations, and it goes without saying that various modifications and improvements are possible within the scope of the matters described in the claims of the present application.

[0055] REFERENCE SIGNS LIST 10 Energy storage module, 20 Energy storage device, 21 Positive electrode, 22 Negative electrode, 23 Separator, 24 Electrode group, 25 Outer can, 25A Groove, 25B Bottom surface, 26 Sealing body, 27 Positive electrode tab, 28 Negative electrode tab, 29 Gasket, 30 Insulating plate, 31 Upper holder, 32 Lower holder, 33 Positive electrode current collector, 34 Negative electrode current collector, 40 Case, 50 Coolant, 60 Switching device, 61 Exhaust port, 62 Recovery path, 62A Inclined portion, 63 Switching valve, 64 Pressure sensor (pressure detector), 65 Collection member, 66 Blower, 67 Recovery port, 70 Control device, 71 CPU, 72 Memory, 73 Control program, 74 Control program data, 110 Energy storage module

Claims

1. An energy storage module comprising: at least one energy storage device; a case that houses the at least one energy storage device; a cooling liquid that immerses the plurality of energy storage devices within the case; and a switching device that switches between a first state in which gas within the case is exhausted from the case, and a second state in which the cooling liquid contained in the gas is collected.

2. An energy storage module according to claim 1, wherein the switching device is provided in the case and comprises: an exhaust port for exhausting the gas; a recovery path for collecting the coolant contained in the gas; and a switching valve for switching between the first state and the second state, wherein in the first state, the switching valve connects the exhaust port to the outside of the case, and in the second state, the switching valve connects the exhaust port to the recovery path.

3. An energy storage module according to claim 2, further comprising a pressure detector that detects the pressure inside the case, and wherein the switching valve is switched to the first state when the pressure detected by the pressure detector is equal to or greater than a first pressure.

4. An electric storage module according to claim 3, wherein the first pressure is set to be substantially the same as a pressure at which an exhaust valve of at least one of the electric storage devices operates.

5. An energy storage module according to claim 3 or 4, wherein the switching valve is switched to a state in which the exhaust port and the recovery path communicate with each other when the pressure detected by the pressure detector is a second pressure that is lower than the first pressure.

6. An electric storage module according to any one of claims 3 to 5, wherein a collection member for collecting the coolant is disposed in the recovery path.

7. The energy storage module according to any one of claims 2 to 6, wherein the recovery path has a recovery port that communicates with the inside of the case.

8. The energy storage module according to claim 7, wherein the recovery path slopes downward to the recovery port.

9. An electric storage module according to any one of claims 2 to 8, wherein the recovery path is provided with a blower that blows air in a direction in which the coolant is recovered into the case.

10. The energy storage module according to claim 9, wherein the blower is driven when the pressure is equal to or greater than the second pressure and less than the first pressure.

11. The energy storage module according to claim 10, wherein the second pressure is greater than atmospheric pressure.

12. The energy storage module according to any one of claims 2 to 11, wherein the exhaust port is closed by a waterproof and breathable membrane.

13. The energy storage module according to any one of claims 7 to 12, comprising a plurality of the switching devices.

14. The energy storage module according to claim 13, wherein the recovery paths of the plurality of switching devices each have a common recovery port.

15. An electricity storage module according to any one of claims 6 to 14, wherein the material of the collection member is glass fiber, glass wool, or polyvinylidene fluoride resin.

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