Energy Storage Module

Abstract

This power storage module is provided with a plurality of power storage devices and a heater for heating the plurality of power storage devices. Each of the plurality of power storage devices has an exhaust valve through which gas in the power storage device is discharged to the outside. The heater faces the exhaust valve. In addition, the power storage module is further provided with: a case for housing the plurality of power storage devices and the heater; and an exhaust duct that is formed on the upper side of the inside of the case and that is in communication with the the outside of the case.

Description

[Technical field]

[0001] The present disclosure relates to an energy storage module including a plurality of energy storage devices. [Background technology]

[0002] Conventionally, a storage module including a plurality of storage devices is known. For example, Patent Document 1 discloses a storage module including a plurality of storage devices, holding blocks forming the sides of the storage devices, and a heater attached to one of the opposing holding blocks. The heater heats the storage devices to an appropriate temperature when starting the storage devices, for example, at a low temperature. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-254637 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the power storage module disclosed in Patent Document 1, a heater is attached to the side surface of the power storage module, so a large amount of heat is dissipated to the outside of the power storage module, which reduces the heating efficiency of the heater when heating the power storage device.

[0005] An object of the present disclosure is to provide an electricity storage module capable of improving the heating efficiency of a heater that heats an electricity storage device. [Means for solving the problem]

[0006] An energy storage module that is one embodiment of the present disclosure includes a plurality of energy storage devices and a heater that heats the plurality of energy storage devices, each of which has an exhaust section that discharges gas within the energy storage device to the outside of the energy storage device, and the heater faces the exhaust section. Effect of the Invention

[0007] According to one embodiment of the present disclosure, it is possible to improve the heating efficiency of a heater that heats a power storage device. [Brief description of the drawings]

[0008] [Figure 1] 1 is a side cross-sectional view showing an example of an electric storage module according to an embodiment; [Diagram 2] 1 is a side cross-sectional view showing an example of an electricity storage device according to an embodiment; [Diagram 3] FIG. 2 is a schematic diagram illustrating a heater according to an embodiment; [Figure 4] FIG. 2 is a block diagram showing a control configuration of a heater according to an embodiment; [Diagram 5] FIG. 2 is a schematic diagram showing an arrangement of a heater and a power storage device. [Figure 6] FIG. 4 is a schematic diagram showing a heater according to another embodiment of the present invention. [Figure 7] FIG. 4 is a schematic diagram showing a heater according to another embodiment of the present invention. [Figure 8] 4 is a side cross-sectional view of the electricity storage module, showing a state in which gas is generated from the electricity storage device. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. The shapes, materials, and quantities described below are examples for the purpose of explanation and can be changed as appropriate according to the specifications of the energy storage module. In the following, the same reference numerals are used to denote equivalent elements in all drawings.

[0010] An electricity storage module 10 as one example of an embodiment will be described with reference to Fig. 1. Fig. 1 is a side cross-sectional view showing the electricity storage module 10.

[0011] The power storage module 10 is primarily used as a power source for motive power. The power storage module 10 is 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. However, the use of the power storage module 10 is not limited to a specific purpose, and the module may be used as a power source for various electric devices used indoors and outdoors, such as cleaners, radios, lighting devices, digital cameras, and video cameras, other than electric devices.

[0012] The energy storage module 10 includes a plurality of cylindrical energy storage devices 20, a heater 50 for heating the plurality of energy storage devices 20, a case 40 as a housing for accommodating the plurality of energy storage devices 20 and the heater 50, an exhaust duct 45 formed on the upper side of the interior of the case 40 and communicating with the outside of the case 40, a thermally conductive material 60 for conducting heat from the heater 50 to the energy storage devices 20, a current collecting plate 70 for electrically connecting each of the plurality of energy storage devices 20, an upper holder 80 for holding each of the upper ends of the plurality of energy storage devices 20, and a lower holder 90 for holding each of the lower ends of the plurality of energy storage devices 20.

[0013] The plurality of electric storage devices 20 are packed closely together in the electric storage module 10, and adjacent electric storage devices 20 are arranged. For example, the plurality of electric storage devices 20 may be arranged in a zigzag pattern in a plurality of rows. When the gas in the electric storage device 20 increases and the pressure in the electric storage device 20 rises (hereinafter, this state is also referred to as an abnormality in the electric storage device 20), the electric storage device 20 discharges gas or ejected material (e.g., contents such as electrolyte and solid matter in the electric storage device 20) generated from inside the electric storage device 20 to the outside of the electric storage device 20 (e.g., toward the upper side of the electric storage device 20 in FIG. 1 ). Details of the electric storage device 20 will be described later. Hereinafter, the discharge of gas accumulated inside the electric storage device 20 in an abnormal state is also referred to as exhaust.

[0014] The exhaust duct 45 exhausts gas inside the power storage device 20 to the outside of the case 40 when an abnormality occurs in the power storage device 20. The exhaust duct 45 is a duct formed by the upper side part 40A of the case 40 located above the heater 50 and the upper holder 80. The exhaust duct 45 has an exhaust port (not shown) that communicates with the outside of the case 40. The exhaust duct 45 in this embodiment is a duct formed by the upper side part 40A and the upper holder 80, but is not limited to this. The exhaust duct only needs to have a space that communicates with the outside of the case 40 on the side where the power storage device 20 is exhausted.

[0015] When the power storage device 20 exhausts gas, the heater 50 and the thermally conductive material 60 burst, and the exhaust duct 45 communicates with the inside of the power storage device 20. This allows the exhaust duct 45 to exhaust gas that was inside the power storage device 20 to the outside.

[0016] The heater 50 heats the power storage device 20 to an appropriate temperature, for example, when starting up the power storage device 20 at a low temperature. The heater 50 is disposed inside the exhaust duct 45 and on the bottom surface of the exhaust duct 45. The heater 50 is disposed above the upper holder 80 via a current collector plate 70. The heater 50 is also disposed above the power storage device 20 via a thermally conductive material 60. When the power storage device 20 exhausts gas, the heater 50 bursts due to the pressure of the exhausted gas. Details of the heater 50 will be described later.

[0017] According to the configuration of the heater 50, above the heater 50, the air in the upper part 40A of the case 40 and the exhaust duct 45 suppresses the heat generated by the heater 50 from escaping in a direction other than the heat transfer path to the power storage device 20. That is, above the heater 50, the air inside the upper part 40A of the case 40 and the exhaust duct 45 functions as a heat insulating material. As a result, when the heater 50 heats the power storage device 20, less heat is dissipated to the outside of the case 40 compared to a configuration in which the heater 50 is in contact with the air in an open space. On the other hand, below the heater 50, the heat conductive material 60 promotes the heat conduction of the heater 50. Therefore, when the heater 50 heats the power storage device 20, the power storage device 20 can be heated to an appropriate temperature in a short time. In addition, the loss of energy required to heat the power storage device 20 to a predetermined temperature can also be reduced. From the above, in the case 40, the outlet part of the exhaust duct 45 may be sealed when the power storage device 20 is in a normal state. This configuration improves the heat insulating effect between the air in exhaust duct 45 and the air outside case 40, further improving the heating efficiency of heater 50. When the exhaust section of power storage device 20 is provided on the bottom side of the exterior can, heater 50 may be disposed below power storage module 10 so that the exhaust section on the bottom side faces heater 50. Moreover, heater 50 may be composed of a pair of heaters 50 disposed on either side of power storage device 20.

[0018] The thermally conductive material 60 is for conducting heat from the heater 50 to the electricity storage device 20 when the electricity storage device 20 is heated to an appropriate temperature by the heater 50. That is, the heater 50 and the electricity storage device 20 are thermally connected via the thermally conductive material 60. The thermally conductive material 60 is insulating. The thermally conductive material 60 is accommodated between the heater 50 and the electricity storage device 20 at the opening 80B of the upper holder 80. When the electricity storage device 20 emits gas, the thermally conductive material 60 bursts due to the pressure of the gas. For example, the thermally conductive material 60 may be a two-component hardening material such as silicone, a paste-like silicone, or a two-component hardening material such as urethane containing a metal oxide (e.g., aluminum oxide, zinc oxide), a metal nitride (e.g., aluminum nitride, boron nitride), or a metal oxynitride (e.g., aluminum oxynitride).

[0019] The current collector 70 is, for example, a plate-like member having an insulating substrate 75, a positive current collector 71 (first current collector) disposed on the insulating substrate 75 and connected to a positive terminal, and a negative current collector 72 (second current collector) connected to a negative terminal. The current collector 70 may be disposed such that the insulating substrate 75 faces the upper holder 80. The positive current collector 71 and the negative current collector 72 are each a metal sheet, and have current collector leads for electrical connection from the edge of the metal sheet to each terminal. Each of these current collector leads extends to each of the power storage devices 20 through an opening 80B of the upper holder 80. The positive current collector 71 and the negative current collector 72 may be disposed side by side in the main surface direction of the insulating substrate 75. Also, a gap may be provided between the positive current collector 71 and the negative current collector 72. The current collector 70 is provided between the heater 50 and the upper holder 80. The current collecting plate 70 is made of a material having good electrical and thermal conductivity, and is a metal plate such as an iron plate, a nickel plate, a copper plate, or an aluminum plate, the surface of which is plated with nickel or the like. In the electricity storage module 10, a current collecting plate that functions as the positive current collecting member 71 and a current collecting plate that functions as the negative current collecting member 72 may be separated, and one current collecting plate may be disposed on the sealing body side of the electricity storage device 20 and electrically connected to the sealing body 32, and the other current collecting plate may be disposed on the bottom side of the exterior can 31 (see FIG. 2) of the electricity storage device 20 and electrically connected to the exterior can 31. In this case, the opening 90B of the lower holder 90 may be filled with a thermally conductive material 60.

[0020] The upper holder 80 holds the upper end portions of the arranged power storage devices 20. The lower surface of the upper holder 80 is formed with a storage section 80A in which the upper end portions of the power storage devices 20 are stored. The storage section 80A of the upper holder 80 is formed with an opening 80B that communicates the outer surface (upper surface) of the upper holder 80 with the storage section 80A, and stores the thermal conductive material 60. The upper holder 80 is formed of an insulating material such as a thermoplastic resin or a thermosetting resin. A holding material 81 is provided between the storage section 80A of the upper holder 80 and the lower end portions of the power storage devices 20. The holding material 81 is made of an epoxy adhesive or a silicone elastic adhesive. The upper holder 80 may be made of a metal such as aluminum or iron as long as insulation with the power storage devices 20 and the current collector plate 70 can be ensured.

[0021] The lower holder 90 holds the lower end portions of the arranged power storage devices 20. An upper surface of the lower holder 90 is formed with a storage section 90A for storing the lower end portions of the power storage devices 20. The lower holder 90 is formed of an insulating material such as a thermoplastic resin or a thermosetting resin. A holding material 91 is provided between the storage section 90A of the lower holder 90 and the lower end portions of the power storage devices 20. An epoxy adhesive or a silicone elastic adhesive is used as the holding material 91. The lower holder 90 may be made of a metal such as aluminum or iron as long as insulation from the power storage devices 20 and the current collector plate 70 can be ensured.

[0022] The electricity storage device 20 will be described with reference to Fig. 2. Fig. 2 is a side cross-sectional view showing the electricity storage device 20.

[0023] A cylindrical lithium ion secondary battery is used as the power storage device 20. Note that the power storage device 20 may be a nickel-metal hydride battery or a capacitor in addition to the lithium ion secondary battery. The power storage device 20 is configured by housing an electrode group 24 and an electrolyte inside a battery case 30. The battery case 30 has a cylindrical outer can 31 and a sealing body 32 that insulates and seals the outer can 31.

[0024] The electrode group 24 is configured by spirally winding a positive electrode 21 as a strip-shaped first electrode and a negative electrode 22 as a strip-shaped second electrode with a strip-shaped separator 23 interposed therebetween. In the electrode group 24, the positive electrode 21, the negative electrode 22, and the separator 23 are alternately stacked in the radial direction of the electrode group 24. Insulating plates 28, 29 are provided above and below the electrode group 24 (both ends in the winding axis direction of the electrode group 24), respectively.

[0025] The positive electrode 21 is electrically connected to the sealing body 32 (positive electrode terminal) by the positive electrode lead 26. The positive electrode lead 26 is connected to the positive electrode 21, extends from the upper end of the electrode group 24, passes through the through hole 28A of the insulating plate 28, and is welded to the lower surface of the filter 33 of the sealing body 32.

[0026] The negative electrode 22 is electrically connected to the exterior can 31 (negative electrode terminal) by a negative electrode lead 27. The negative electrode leads 27 are provided, for example, at each of an inner winding end and an outer winding end of the electrode group 24, extend from the lower end of the electrode group 24, and are welded to the bottom 31B of the exterior can 31.

[0027] The electrolytic solution contains a non-aqueous solvent and an electrolyte salt dissolved in the non-aqueous solvent. The non-aqueous electrolyte is not limited to a liquid electrolyte, and may be a gel or solid electrolyte.

[0028] The outer can 31 is a metallic container formed into a cylindrical shape having an opening 31A at the upper end side. The outer can 31 accommodates the electrode group 24 and the non-aqueous electrolyte. As described above, the outer can 31 is electrically connected to the negative electrode 22. The outer can 31 is formed by drawing a metal such as aluminum, iron, steel, copper, or nickel.

[0029] The sealing body 32 closes the opening 31A of the exterior can 31 together with the gasket 39. As described above, the sealing body 32 is electrically connected to the positive electrode 21. The sealing body 32 is formed by stacking a filter 33, an inner cap 34, an insulating member 35, an exhaust valve 36, and a cap 37 in this order from the electrode group 24 side. Each member constituting the sealing body 32 has, for example, a disk shape or a ring shape, and each member except for the insulating member 35 is electrically connected to each other. The exhaust valve 36 ruptures when the gas generated from inside the battery case 30 reaches a predetermined pressure or more in the event of thermal runaway of the electricity storage device 20 as described above.

[0030] For example, if an internal short circuit or the like occurs in the electrode group 24 and the internal pressure of the battery case 30 rises, the exhaust valve 36 bulges toward the cap 37, the connection between the inner cap 34 and the exhaust valve 36 comes off, and the current path between the inner cap 34 and the exhaust valve 36 is cut off. If the internal pressure of the battery case 30 rises further, the exhaust valve 36 breaks. As a result, gas generated inside the battery case 30 is discharged to the outside of the battery case 30 via the through hole 33A of the filter 33, the through hole of the inner cap 34, the crack in the ruptured exhaust valve 36, and the open part 37A of the cap 37.

[0031] The configuration of the heater 50 will be described with reference to Fig. 3. Fig. 3 is a schematic diagram showing the heater 50.

[0032] Heater 50 is formed in a sheet shape by providing substrates 52 above and below metal foil heater 51 as a heating element. The heating element is not limited to metal foil heater 51, and may be, for example, an electric heating wire heater.

[0033] The metal foil heater 51 is a thin sheet-like heating element that generates heat by passing electricity through a metal foil. The metal foil heater 51 is formed to pass through all the thermal conductive materials 60 of the power storage module 10, and heats all the power storage devices 20 via the thermal conductive materials 60. The metal foil heater 51 used is one that breaks when a pressure equal to or greater than a predetermined pressure is applied from the outside. The metal foil heater 51 is made of, for example, aluminum, a nickel-chromium alloy, iron, chromium, an aluminum alloy, or the like.

[0034] The substrate 52 is for conducting heat generated by the metal foil heater 51 to the outside of the heater 50. The substrate 52 used is one that will burst when pressure equal to or greater than the above-mentioned predetermined pressure is applied from the outside. The substrate 52 is also made of an insulating material. For example, silicon rubber, PET film, polyimide film, etc. are used as the substrate 52.

[0035] According to the configuration of the heater 50, the heater 50 explodes when a pressure equal to or greater than a predetermined pressure is applied from the outside. The predetermined pressure is set to a pressure that is at least lower than the pressure at which the exhaust valve 36 operates. As a result, when the exhaust valve 36 of the power storage device 20 explodes, the heater 50 explodes due to the pressure of the gas generated from inside the battery case 30. In this way, when an abnormality occurs in the power storage device 20, the inside of the power storage device 20 and the exhaust duct 45 are communicated with each other, and an exhaust path is secured.

[0036] In addition, when the electricity storage device 20 exhausts, ejected matter may be discharged together with the gas. The ejected matter is often conductive and high-temperature objects such as broken pieces of the positive electrode 21, the negative electrode 22, leads, and the like housed in the battery case 30, and electrolyte. In addition, if the exhausted electricity storage device 20 is subjected to vibration after exhaust from the electricity storage device 20 is completed, the ejected matter may fly out through the ruptured part of the exhaust valve 36. According to the configuration of the heater 50, since the base material 52 is formed of an insulating material, when the ejected matter is ejected into the exhaust duct 45, the passing ejected matter and the current collector plate 70 of the other electricity storage device 20 are easily electrically insulated by the heater 50. In addition, since the base material 52 has heat resistance to withstand the temperature rise of the metal foil heater 51, even if the base material 52 comes into contact with the high-temperature ejected matter, the base material 52 is unlikely to form a hole or tear. As a result, the current collector plate 70 is unlikely to short-circuit. This effect is particularly effective when the positive current collecting member 71 and the negative current collecting member 72 in the current collecting plate 70 are arranged together in one location in the power storage module 10. Since the positive current collecting member 71 and the negative current collecting member 72 are arranged with a gap therebetween in the current collecting plate 70, arranging the heater 50 to cover this gap is effective in suppressing a short circuit in the current collecting plate 70. By suppressing a short circuit in this manner, it is possible to suppress a normal power storage device 20 from falling into an abnormal state due to the influence of an abnormal power storage device 20.

[0037] The control configuration of the heater 50 will be described with reference to Fig. 4. Fig. 4 is a block diagram showing the control configuration of the heater 50.

[0038] The heater 50 is connected to a power source 55 that supplies power and to a controller 56 that controls the supply of power and detects breakage of the heater 50 .

[0039] The power supply 55 supplies power to the metal foil heater 51 of the heater 50. The power supply 55 may be the power storage module 10. Alternatively, a power supply of the electric device in which the power storage module 10 is mounted or another power supply of the electric device may be used.

[0040] The control device 56 has a function of controlling the supply of power to the metal foil heater 51 so that the power storage device 20 is at an appropriate temperature, for example, using a temperature sensor provided near the power storage device 20. The control device 56 can also detect that the power supply to the metal foil heater 51 has been cut off, for example, by detecting that the resistance value of the metal foil heater 51 has become infinite. This allows the control device 56 to detect that the heater 50 has burst. In other words, the control device 56 can detect that at least one power storage device 20 in the power storage module 10 is in an abnormal state.

[0041] The arrangement of the heater 50 and the power storage device 20 will be described with reference to Fig. 5. Fig. 5 is a schematic diagram showing the arrangement of the heater 50 and the power storage device 20.

[0042] As illustrated in FIG. 5, a part of metal foil heater 51 may be opposed to opening 80B of upper holder 80 in order to more reliably burst metal foil heater 51 when electricity storage device 20 is exhausted.

[0043] Furthermore, in metal foil heater 51, the portion that does not overlap opening 80B may be fixed more firmly than the portion that overlaps opening 80B. Therefore, heater 50 may be fixed to case 40 or upper holder 80 at this non-overlapping portion.

[0044] The configuration of a heater 50 as another example of the embodiment will be described with reference to Fig. 6 and Fig. 7. Fig. 6 and Fig. 7 are schematic diagrams showing the heater 50.

[0045] As illustrated in FIG. 6, in a heater 50 as another example of the embodiment, a fragile portion 51A, for example, configured by a perforation, may be formed in a portion of the metal foil heater 51 overlapping the opening 80B so that the mechanical strength is weaker than the other portions of the metal foil heater 51. With these configurations, the metal foil heater 51 is partially weakened and becomes more likely to burst. Similarly, a fragile portion 52A, such as a perforation, may be formed in the vicinity of the opening 80B of the base material 52, not in the metal foil heater 51, so that the mechanical strength is weaker than the other portions of the base material 52, and the base material 52 and the metal foil heater 51 overlapping the opening 80B may be simultaneously burst. In this case, the fragile portion 51A or the fragile portion 52A may be formed outside the periphery of the opening 80B. This configuration increases the area of ​​contact between the region surrounded by the fragile parts 51A, 52A in the heater 50 and the gas ejected from the electricity storage device 20, and increases the stress applied to the fragile parts 51A, 52A when the gas collides with this region, compared to the heater 50 in which the fragile parts 51A, 52A are within the opening 80B. This makes it possible to more reliably burst the heater 50.

[0046] 7, in heater 50 as another example of the embodiment, mesh portion 52B made up of countless fine holes may be formed in a portion overlapping opening 80B of metal foil heater 51 or base material 52, so that only gas emitted from electricity storage device 20 passes through mesh portion 52B of heater 50, and ejected matter is blocked by the smallness of the holes in mesh portion 52B. With this configuration, gas discharged from electricity storage device 20 can be guided to exhaust duct 45 without causing heater 50 to burst.

[0047] A state in which gas is generated from the electricity storage device 20 will be described with reference to Fig. 8. Fig. 8 is a side cross-sectional view showing the electricity storage module 10.

[0048] In the electricity storage device 20, gas is generated when thermal runaway occurs or when a component inside the electricity storage device 20 deteriorates. When gas is generated in the electricity storage device 20, the exhaust valve 36 bursts as described above, and the gas is discharged from the cap 37.

[0049] The thermally conductive material 60 used is one that breaks when a pressure equal to or greater than a predetermined pressure is applied from the outside. The predetermined pressure is set to a pressure that is at least lower than the pressure at which the exhaust valve 36 operates. As a result, the thermally conductive material 60 breaks due to the pressure of the gas ejected from the electricity storage device 20 that breaks the exhaust valve 36. Then, the gas discharged from the electricity storage device 20 passes through the cracks in the broken thermally conductive material 60 and reaches the heater 50.

[0050] As described above, the heater 50 bursts due to the pressure of the gas ejected from the power storage device 20 bursting the exhaust valve 36. As a result, the gas discharged from the power storage device 20 passes through the cracks in the burst heater 50 and reaches the exhaust duct 45. At this time, the control device 56 detects that the heater 50 has burst, thereby detecting that the power storage device 20 is in an abnormal state.

[0051] The exhaust duct 45 exhausts gas discharged from the power storage device 20 to the outside. In this way, in the power storage module 10, when the power storage device 20 goes into an abnormal state, the thermally conductive material 60 and the heater 50 burst, so that the inside of the power storage device 20 communicates with the exhaust duct 45, and an exhaust path is secured. As a result, even if the thermally conductive material 60 and the heater 50 are disposed between the power storage device 20 and the exhaust duct 45, the gas or ejected material discharged from the power storage device 20 can be exhausted to the outside.

[0052] A description will now be given of the effects of the power storage module 10. According to the power storage module 10, the heating efficiency of the heater 50 that heats the power storage device 20 can be improved.

[0053] That is, by providing the heater 50 inside the exhaust duct 45, the upper part 40A of the case 40 and the air inside the exhaust duct 45 function as a heat insulator, and it is possible to reduce heat radiation from the heater 50 to the outside of the electricity storage module 10. This makes it possible to improve the heating efficiency of the heater 50 when heating the electricity storage device 20.

[0054] Furthermore, even if heater 50 is provided inside exhaust duct 45, an exhaust path for the gas generated from electricity storage device 20 can be ensured.

[0055] That is, the heater 50 and the thermally conductive material 60 are designed to burst when a pressure equal to or greater than a predetermined pressure is applied from the outside, and the predetermined pressure is set to a pressure at least lower than the pressure at which the exhaust valve 36 operates. As a result, even if the exhaust valve 36 of the electricity storage device 20 operates and gas is ejected from the electricity storage device 20, the heater 50 and the thermally conductive material 60 burst due to the pressure of this gas, and the electricity storage device 20 and the exhaust duct 45 communicate with each other, so that the gas generated from the electricity storage device 20 is exhausted from the exhaust duct 45 to the outside.

[0056] Furthermore, since the base material 52 constituting the heater 50 is formed of an insulating material, when the ejection generated from inside the power storage device 20 passes through the inside of the exhaust duct 45, the ejection passing through is electrically insulated from the current collecting plate 70 of the other power storage device 20 by the heater 50. This prevents the current collecting plate 70 from shorting out. Also, there is no need to provide a separate insulating material inside the exhaust duct 45, and the number of parts can be reduced.

[0057] Furthermore, since the base material 52 constituting the heater 50 is formed of an insulating material, when ejection generated from inside the power storage device 20 passes through the inside of the exhaust duct 45, the passing ejection is likely to be electrically insulated by the heater 50 from other normal power storage devices 20. Therefore, even if one power storage device 20 becomes abnormal, a short circuit with the other power storage devices 20 can be prevented. This makes it possible to prevent a chain reaction of abnormalities of the power storage devices 20 in the power storage module 10. Also, there is no need to provide a separate insulating material inside the exhaust duct 45, and the number of parts can be reduced.

[0058] Furthermore, the control device 56 can detect that the heater 50 has burst. This allows the control device 56 to detect that at least one of the power storage devices 20 in the power storage module 10 has entered an abnormal state. This makes it possible to prevent a chain reaction of abnormalities in the power storage devices 20 in the power storage module 10.

[0059] It should be noted that the present invention is not limited to the above-described embodiment and its modified examples, and various modifications and improvements are possible within the scope of the matters described in the claims of this application. [Explanation of symbols]

[0060] 10 Energy storage module, 15 housing, 15A upper part, 20 Energy storage device, 21 Positive electrode, 22 Negative electrode, 23 Separator, 24 Electrode group, 26 Positive electrode lead, 27 Negative electrode lead, 28 Insulating plate, 28A Through hole, 29 Insulating plate, 30 Battery case, 31 Outer can, 31A Opening, 31B Bottom, 32 Sealing body, 33 Filter, 33A Through hole, 34 Inner cap, 35 Insulating member, 36 Exhaust valve, 37 Cap, 37A Opening, 39 Gasket, 40 Case (housing), 40A Upper part, 45 Exhaust duct, 50 Heater, 51 Metal foil heater, 52 Base material, 55 Power source, 56 Control device, 60 Thermal conductive material, 70 Current collector, 71 Positive electrode current collector, 72 Negative electrode current collecting member, 75 insulating substrate, 80 upper holder, 80A storage portion, 80B opening, 81 holding material, 90 lower holder, 90A storage portion, 91 holding material.

Claims

1. A plurality of power storage devices; a heater for heating the plurality of power storage devices; a housing that houses the plurality of power storage devices and the heater; an exhaust duct formed on one side of the inside of the housing and communicating with the outside of the housing; Equipped with Each of the plurality of power storage devices has an exhaust unit that exhausts gas inside the power storage device to the outside of the power storage device, The heater faces the exhaust portion and is disposed between the exhaust duct and the plurality of power storage devices. Energy storage module.

2. The energy storage module according to claim 1 , When the power storage device is exhausted, the heater explodes. Energy storage module.

3. The storage module according to claim 2, The heater has a weak portion formed therein, the weak portion having a mechanical strength weaker than other portions of the heater. Energy storage module.

4. The storage module according to claim 2 or 3, Further comprising a control device that detects the rupture of the heater when the heater ruptures. Energy storage module.

5. The energy storage module according to any one of claims 1 to 4, The heater includes a heating element and a base material covering the heating element, The substrate is made of an insulating material. Energy storage module.

6. The energy storage module according to claim 1 , a holder including a plurality of storage sections for respectively storing the plurality of power storage devices and a plurality of openings for respectively communicating the plurality of storage sections with an outer surface; The exhaust portion of the power storage device overlaps with each of the plurality of openings. Energy storage module.

7. The storage module according to claim 6, the opening is provided between the heater and the power storage device, An electrically insulating thermally conductive material is disposed inside the opening. Energy storage module.

8. The storage module according to claim 7, When the power storage device discharges gas, the gas passes through the opening while bursting the thermally conductive material. Energy storage module.

9. The storage module according to claim 6, a current collector plate between the heater and the holder for electrically connecting the plurality of power storage devices; The power storage device has a first electrode and a second electrode, the current collecting plate includes a first current collecting member electrically connected to the first electrode, a second current collecting member arranged alongside the first current collecting member and electrically connecting to the second electrode, and a gap formed between the first current collecting member and the second current collecting member, The heater faces the gap. Energy storage module.

10. A plurality of power storage devices; a heater for heating the plurality of power storage devices; a housing that houses the plurality of power storage devices and the heater; an exhaust duct formed on one side of the inside of the housing and communicating with the outside of the housing; Equipped with Each of the plurality of power storage devices has an exhaust section that exhausts contents contained in the power storage device to the outside of the power storage device, The heater is disposed so as to block the gas discharged from the exhaust portion, and is disposed between the exhaust duct and the plurality of power storage devices. Energy storage module.

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