JP2015028884A - Power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage device capable of quickly cooling a power storage element.SOLUTION: A power storage module 10 is a power storage device including one or more power storage elements 100. The power storage module 10 include a liquid outflow member 210 which is disposed at the lateral side of the power storage elements 100 and stores a liquid therein. The liquid outflow member 210 includes outflow parts 212 and 213 which flow the liquid to the outer side of the liquid outflow member 210 at a predetermined temperature or pressure.

Description

  The present invention relates to a power storage device having one or more power storage elements.

  In a power storage device having one or more power storage elements, when the power storage element is repeatedly charged and discharged, the power storage element generates heat, and thus the power storage device needs to be cooled. For this reason, the technique which can cool an electrical storage apparatus conventionally is proposed (for example, refer patent document 1). In this technique, the power storage device is cooled by attaching a heat dissipation member to the power storage device (battery module).

Japanese Patent No. 5109559

  However, in the above conventional technique, the power storage device is cooled, but only the heat is dissipated by the heat radiating member and cooled by the cooling gas. Is insufficient and cannot be cooled rapidly.

  In particular, when a plurality of power storage elements are arranged adjacent to each other, the heat of the power storage elements that suddenly generate heat may be transferred in a chain manner to the adjacent power storage elements, which may affect the entire power storage device.

  The present invention has been made to solve the above problems, and an object thereof is to provide a power storage device capable of rapidly cooling a power storage element.

  In order to achieve the above object, a power storage device according to one embodiment of the present invention is a power storage device including one or more power storage elements, is disposed on a side of the power storage element, and contains or supplies liquid therein. The liquid outflow member includes an outflow portion that causes the liquid to flow out to the outside of the liquid outflow member at a predetermined temperature or pressure.

  According to this, the power storage device includes the liquid outflow member that stores or supplies the liquid on the side of the power storage element, and the liquid outflow member is an outflow portion that allows the liquid to flow outward at a predetermined temperature or pressure. have. That is, when the electricity storage element generates heat and the outflow portion reaches a predetermined temperature or the internal pressure of the liquid outflow member reaches a predetermined pressure, the outflow portion causes the liquid to flow out of the liquid outflow member. Accordingly, the liquid evaporates due to contact with the power storage element or the like, and the power storage element is cooled by an endothermic reaction when evaporating. For this reason, according to the said electrical storage apparatus, an electrical storage element can be cooled rapidly.

  Further, the outflow portion is formed on at least one of the first surface of the liquid outflow member facing the power storage element and the second surface opposite to the first surface. Also good.

  According to this, the outflow portion is formed on at least one of the first surface and the second surface of the liquid outflow member. Here, the first surface of the liquid outflow member is a surface facing the power storage element, and the second surface of the liquid outflow member is a surface facing another power storage element arranged on the side of the power storage element. For this reason, since the liquid that has flowed out from the outflow portion easily comes into contact with the power storage element or another power storage element, the power storage element can be rapidly cooled. For this reason, when a plurality of power storage elements are arranged adjacent to each other, it is possible to prevent the heat of the power storage elements that suddenly generated heat from being transferred to the adjacent power storage elements.

  Further, a holding member that is disposed on the side where the outflow portion of the liquid outflow member is disposed and holds the liquid that has flowed out from the outflow portion may be provided.

  According to this, the power storage device further includes a holding member that holds the liquid that has flowed out by the outflow portion. Accordingly, the holding member can hold the liquid that has flowed out from the outflow portion and prevent the liquid from flowing out of the power storage device, so that the power storage element can be efficiently and rapidly cooled.

  Further, the outflow portion releases the internal pressure of the liquid outflow member and causes the liquid to outflow to the outside of the liquid outflow member when the internal pressure of the liquid outflow member exceeds the predetermined pressure. It may be.

  According to this, when the internal pressure of the liquid outflow member exceeds a predetermined pressure, the outflow portion can rapidly cool the storage element that has rapidly generated heat by causing the liquid to flow out of the liquid outflow member. it can.

  In addition, the outflow portion may cause the liquid to flow out of the liquid outflow member by melting at the predetermined temperature.

  According to this, the outflow part melts at a predetermined temperature and allows the liquid to flow out to the outside of the liquid outflow member, so that the storage element exceeding a certain temperature can be rapidly cooled.

  In addition, the liquid outflow member may further include a pressure release portion that releases an internal pressure of the liquid outflow member before the outflow portion melts at the predetermined temperature.

  According to this, the liquid outflow member can release the internal pressure by the pressure release portion when the internal pressure becomes high before the outflow portion melts at a predetermined temperature, and thus the outflow portion is broken by the internal pressure. Can be suppressed. For this reason, it is possible to prevent the liquid from flowing out from the outflow part before the outflow part melts at a predetermined temperature, and to allow the liquid to flow out from the outflow part with high accuracy.

  Furthermore, a liquid supply unit that contains the liquid and is connected to the liquid outflow member so as to be able to supply the liquid may be provided.

  According to this, since the power storage device further includes the liquid supply unit that supplies the liquid to the liquid outflow member, even when the amount of the liquid stored in the liquid outflow member is small, a large amount of liquid is stored. It can be used for cooling the element, and the storage element can be rapidly cooled. Further, the liquid outflow member can be reduced, and the power storage device can be made compact.

  Further, the liquid may contain at least water.

  According to this, the outflow portion causes the liquid to flow out in order to cool the power storage element, and the liquid uses harmless, less corrosive, and highly safe water that does not ignite. Since water evaporates at 100 ° C. and has a large heat of evaporation, the use of water as the liquid can suppress the heat generation of the power storage element to hundreds of degrees or less that may cause a malfunction event. For this reason, according to the said electrical storage apparatus, safety | security is high and an electrical storage element can be cooled rapidly. Moreover, components other than water may be mixed in the liquid, and the evaporation temperature of the liquid can be controlled by components other than the water.

  The liquid outflow member is disposed between the electricity storage element and another electricity storage element adjacent to the electricity storage element, and the outflow portion is at a temperature equal to or lower than a temperature at which a safety valve of the other electricity storage element is opened. The liquid may flow out of the liquid outflow member at a temperature or pressure corresponding to the temperature.

  According to this, the outflow portion allows the liquid to flow out to the outside of the liquid outflow member before the safety valve of the adjacent power storage element is opened, thereby preventing the temperature of the adjacent power storage element from rising. It is possible to prevent the safety valves from opening in a chain.

  In order to achieve the above object, a power storage device according to one embodiment of the present invention is a power storage device including a power storage module including a plurality of power storage devices, and is disposed on a side of the power storage module and inwardly. A liquid outflow member that contains or supplies liquid is provided, and the liquid outflow member has an outflow portion that causes the liquid to flow out to the outside of the liquid outflow member at a predetermined temperature or pressure.

  According to this, the power storage device includes the liquid outflow member that stores or supplies the liquid at the side of the power storage module, and the liquid outflow member is an outflow portion that causes the liquid to flow outward at a predetermined temperature or pressure. have. That is, when the power storage module generates heat and the outflow portion reaches a predetermined temperature or the internal pressure of the liquid outflow member reaches a predetermined pressure, the outflow portion causes the liquid to flow out of the liquid outflow member. As a result, the liquid evaporates due to contact with the power storage module or the like, and the power storage module is cooled by an endothermic reaction when evaporating. For this reason, according to the said electrical storage apparatus, an electrical storage module can be cooled rapidly.

  According to the power storage device of the present invention, the power storage element can be rapidly cooled.

It is a perspective view which shows the external appearance of the electrical storage module which concerns on Embodiment 1 of this invention. It is a disassembled perspective view which shows each component at the time of disassembling a part of electrical storage module which concerns on Embodiment 1 of this invention. It is a perspective view which sees through the element container of the electrical storage element which concerns on Embodiment 1 of this invention, and shows an element container inner side. It is a perspective view which shows the external appearance of the liquid outflow member which concerns on Embodiment 1 of this invention. It is a perspective view which shows the positional relationship of the liquid outflow member which concerns on Embodiment 1 of this invention, a holding member, and an electrical storage element. It is a disassembled perspective view which decomposes | disassembles a part of electrical storage module which concerns on the modification 1 of Embodiment 1 of this invention, and shows the structure of a cooling device. It is a perspective view which shows the external appearance of the liquid outflow member which concerns on the modification 1 of Embodiment 1 of this invention. It is a perspective view which shows the positional relationship of the cooling device and electrical storage element which concern on the modification 1 of Embodiment 1 of this invention. It is a perspective view which shows the external appearance of the liquid outflow member which concerns on the modification 2 of Embodiment 1 of this invention. It is a perspective view which shows the external appearance of the liquid supply part which supplies a liquid to the cooling device which concerns on the modification 3 of Embodiment 1 of this invention. It is a perspective view which shows the arrangement position of the cooling device which concerns on Embodiment 2 of this invention. It is a perspective view which shows the positional relationship of the cooling device which concerns on Embodiment 2 of this invention, and an electrical storage module.

  Hereinafter, a power storage module or a power storage pack as a power storage device according to an embodiment of the present invention will be described with reference to the drawings. Each of the embodiments described below shows a preferred specific example of the present invention. Numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of constituent elements, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept are described as optional constituent elements.

(Embodiment 1)
First, the configuration of the power storage module 10 will be described.

  FIG. 1 is a perspective view showing an appearance of a power storage module 10 according to Embodiment 1 of the present invention. The figure shows the inside of the exterior body 300 through the exterior body 300. FIG. 2 is an exploded perspective view showing each component when part of the power storage module 10 according to Embodiment 1 of the present invention is disassembled.

  In these figures, the Z-axis direction is shown as the vertical direction (direction in which gravity acts in the installed state), and in the following, the Z-axis direction will be described as the vertical direction. Since the case where it does not become an up-down direction is also considered, it is not limited to a Z-axis direction being an up-down direction. The same applies to the following drawings.

  The power storage module 10 is a power storage device (battery module) capable of charging electricity from the outside and discharging electricity to the outside. As shown in these drawings, the power storage module 10 includes a plurality of power storage elements 100 (four power storage elements 100 in the present embodiment) and a plurality of cooling devices 200 (three cooling devices 200 in the present embodiment). ) And an exterior body 300 that houses the plurality of power storage elements 100 and the plurality of cooling devices 200.

  The power storage module 10 also has a bus bar that electrically connects adjacent power storage elements 100, a control board for monitoring the charge state and the discharge state of the plurality of power storage elements 100, etc. Omitted and detailed description is also omitted.

  The storage element 100 is a secondary battery that can charge electricity and discharge electricity, and more specifically, is a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. In the present embodiment, four rectangular power storage elements 100 are arranged in series. Note that the number of power storage elements 100 is not limited to four, and may be other plural numbers or one. Further, the shape of the power storage element 100 is not particularly limited. Moreover, the electrical storage element 100 is not limited to a nonaqueous electrolyte secondary battery, A secondary battery other than a nonaqueous electrolyte secondary battery may be sufficient, and a capacitor may be sufficient as it. A detailed description of the configuration of the storage element 100 will be described later.

  The cooling device 200 is a device that is disposed between two adjacent power storage elements 100 and cools the power storage element 100 when the power storage element 100 generates heat. Note that the cooling device 200 may not be disposed between all the power storage elements 100.

  That is, in the present embodiment, three cooling devices 200 are arranged, but the number of cooling devices 200 may be three or less. In addition, the cooling device 200 is not between the two power storage elements 100 but the side surface of the power storage module 10 (for example, the surface on the negative side of the Y-axis direction of the power storage element 100 at the negative end in the Y-axis direction in FIG. It may be arranged on the X-axis direction plus side surface of the module 10 or the like. As described above, the cooling device 200 may be disposed on the side of at least one power storage element 100.

  For example, the X axis direction plus side indicates the arrow direction side of the X axis, and the X axis direction minus side indicates the opposite side to the X axis direction plus side. The same applies to the Y-axis direction and the Z-axis direction.

  Here, as shown in FIG. 2, the cooling device 200 includes a liquid outflow member 210 and holding members 220 and 230.

  The liquid outflow member 210 is a rectangular container disposed on the side (long side surface side) of the power storage element 100. Specifically, the liquid outflow member 210 is a flat member that is disposed on the upper side between one power storage element 100 and another power storage element 100 and extends in the X-axis direction. The shape of the liquid outflow member 210 is not limited to a rectangular shape, and may be a cylindrical shape.

  Further, the liquid outflow member 210 is disposed on the upper side between the two power storage elements 100. However, the liquid outflow member 210 may be any position as long as it does not hinder the cooling of the power storage module 10 by air cooling or the like. It may be arranged in any position. That is, when the power storage module 10 is provided with a fan or the like that cools the power storage module 10 with air, the liquid outflow member 210 is preferably disposed at a position that secures the air passage. In addition, when the power storage module 10 is provided with a device for cooling the power storage module 10 from below by water cooling, the liquid outflow member 210 may be disposed on the side of the power storage element 100.

  Further, the liquid is accommodated inside the liquid outflow member 210. The liquid outflow member 210 has an outflow portion (outflow portion 212 in FIG. 2) that causes the liquid to flow out to the outside of the liquid outflow member 210 at a predetermined pressure. A detailed description of the outflow portion will be described later.

  Here, the liquid accommodated inside the liquid outflow member 210 is preferably a liquid containing water, and in the present embodiment, the liquid is water. The liquid may be fluid or semi-solid (gel), and may be a liquid containing a refrigerant such as an HFC refrigerant or an inert gas solution. However, it is preferable that the solution contained in the liquid is non-flammable, has a large heat of evaporation, is less corrosive, and does not generate a toxic gas. The liquid is selected according to the magnitude of a pressure (for example, a pressure between 2 to 4 atmospheres) set as a pressure at which the outflow portion causes the liquid to flow out of the liquid outflow member 210.

  Moreover, components other than water may be mixed in the liquid, and the evaporation temperature of the liquid can be adjusted by components other than the water.

  The holding members 220 and 230 are arranged on the side where the outflow portion of the liquid outflow member 210 is disposed, and are sheet-like members that hold the liquid that the outflow portion has flowed out. Specifically, the holding members 220 and 230 are disposed between the liquid outflow member 210 and the two power storage elements 100 that sandwich the liquid outflow member 210, and absorb the liquid that the outflow portion has flowed out. That is, the holding members 220 and 230 are arranged on both sides of the liquid outflow member 210 so as to sandwich the liquid outflow member 210.

  The holding members 220 and 230 are rectangular sheets, and are arranged so as to cover the side surface (long side surface) of the power storage element 100. Note that the shape of the holding members 220 and 230 is not limited to a rectangular shape, and the entire side surface of the power storage element 100 may not be covered. In particular, when the power storage module 10 is provided with a fan or the like for cooling the power storage module 10 with air, like the liquid outflow member 210, the holding members 220 and 230 are provided at positions that secure the air passage. It is preferable to arrange.

  The holding members 220 and 230 are not particularly limited as long as the holding members 220 and 230 are formed from a member that holds the liquid that has flowed out from the outflow portion. For example, the holding members 220 and 230 are formed from a porous member such as a liquid absorbent material or sponge.

  The exterior body 300 is a rectangular (box-shaped) member that constitutes the exterior body of the power storage module 10. The exterior body 300 arranges the plurality of power storage elements 100, the cooling device 200, and the like at predetermined positions, and protects the plurality of power storage elements 100, the cooling device 200, and the like from impact and the like. Moreover, the exterior body 300 is made of an insulating material such as a resin, for example, and prevents the power storage element 100 and the like from coming into contact with an external metal member or the like.

  The exterior body 300 is provided with external electrode terminals for charging electricity from the outside and for discharging electricity to the outside, but illustration and detailed description thereof are omitted.

  Next, the power storage element 100 will be described in detail. FIG. 3 is a perspective view showing an appearance of power storage element 100 according to Embodiment 1 of the present invention. This figure shows the inside of the element container 110 through the element container 110.

  As shown in the figure, the storage element 100 includes an element container 110, a positive electrode terminal 120, and a negative electrode terminal 130, and the element container 110 includes a lid plate 111 that is an upper wall. Further, a positive electrode current collector 112, a negative electrode current collector 113, and an electrode body 114 are disposed inside the element container 110, and a safety valve 115 is formed on the lid plate 111. Note that a liquid such as an electrolytic solution is sealed inside the element container 110, but the liquid is not shown.

  The element container 110 includes a casing main body having a rectangular cylindrical shape made of metal and having a bottom, and a metal lid plate 111 that closes an opening of the casing main body. Further, the element container 110 can seal the inside by welding the lid plate 111 and the housing body after the electrode body 114 and the like are accommodated therein.

  The electrode body 114 includes a positive electrode, a negative electrode, and a separator, and is a power generation element that can store electricity. Specifically, the electrode body 114 is a winding type formed by winding a layered arrangement so that a separator is sandwiched between a positive electrode and a negative electrode so that the whole becomes an oval shape. It is an electrode body. The shape of the electrode body 114 may be circular or elliptical.

The positive electrode is an electrode plate in which a positive electrode active material layer is formed on the surface of a long belt-like conductive positive electrode current collector foil made of aluminum or an aluminum alloy. In addition, as a positive electrode active material used for a positive electrode active material layer, if it is a positive electrode active material which can occlude / release lithium ion, a well-known material can be used suitably. For example, as a positive electrode active material, a polyanion compound such as LiMPO ₄ , LiMSiO ₄ , LiMBO ₃ (M is one or more transition metal elements selected from Fe, Ni, Mn, Co, etc.), lithium titanate, Spinel compounds such as lithium manganate, lithium transition metal oxides such as LiMO ₂ (M is one or more transition metal elements selected from Fe, Ni, Mn, Co, and the like) can be used.

The negative electrode is an electrode plate in which a negative electrode active material layer is formed on the surface of a long strip-like conductive negative electrode current collector foil made of copper or a copper alloy. In addition, as a negative electrode active material used for a negative electrode active material layer, if it is a negative electrode active material which can occlude-release lithium ion, a well-known material can be used suitably. For example, as the negative electrode active material, lithium metal, lithium alloy (lithium metal-containing alloys such as lithium-aluminum, lithium-lead, lithium-tin, lithium-aluminum-tin, lithium-gallium, and wood alloy), and lithium can be used. Alloys that can be occluded and released, carbon materials (eg, graphite, non-graphitizable carbon, graphitizable carbon, low-temperature calcined carbon, amorphous carbon, etc.), metal oxides, lithium metal oxides (Li ₄ Ti ₅ O ₁₂ etc. ) And polyphosphoric acid compounds.

  The positive electrode terminal 120 is an electrode terminal electrically connected to the positive electrode of the electrode body 114 via the positive electrode current collector 112, and the negative electrode terminal 130 is the negative electrode of the electrode body 114 via the negative electrode current collector 113. The electrode terminal is electrically connected to.

  That is, the positive electrode terminal 120 and the negative electrode terminal 130 lead the electricity stored in the electrode body 114 to the external space of the power storage element 100, and in order to store the electricity in the electrode body 114, It is an electrode terminal made of metal for introducing. The positive electrode terminal 120 and the negative electrode terminal 130 are attached to the lid plate 111 disposed above the electrode body 114.

  The positive electrode current collector 112 is a member that is disposed between the positive electrode of the electrode body 114 and the side wall of the element container 110 and has conductivity and rigidity that are electrically connected to the positive electrode terminal 120 and the positive electrode. The positive electrode current collector 112 is formed of a metal containing aluminum as a main component, like the positive electrode current collector foil of the positive electrode.

  The negative electrode current collector 113 is disposed between the negative electrode of the electrode body 114 and the side wall of the element container 110, and has conductivity and rigidity electrically connected to the negative electrode terminal 130 and the negative electrode of the electrode body 114. It is a member. The negative electrode current collector 113 is formed of a metal containing copper as a main component, like the negative electrode current collector foil of the negative electrode.

  The safety valve 115 is a circular safety valve that releases the pressure inside the element container 110 by opening the sealed state of the element container 110 by increasing the pressure inside the element container 110. The shape of the safety valve 115 is not limited to a circular shape. In the present embodiment, the safety valve 115 is provided on the lid plate 111, but the safety valve 115 may be provided on the side wall of the element container 110.

  Next, the liquid outflow member 210 will be described in detail. FIG. 4 is a perspective view showing an appearance of the liquid outflow member 210 according to Embodiment 1 of the present invention. FIG. 5 is a perspective view showing the positional relationship among the liquid outflow member 210, the holding members 220 and 230, and the power storage element 100 according to Embodiment 1 of the present invention.

  First, as shown in FIG. 4, the liquid outflow member 210 includes a member main body 211 and outflow portions 212 and 213 formed in the member main body 211.

  The member main body 211 is a rectangular (flat) container containing a liquid, and is formed of polypropylene (PP) or polyethylene (PE) in the present embodiment. The shape of the member main body 211 is not limited to a rectangular shape, and may be a cylindrical shape. The material of the member main body 211 is not limited to PP or PE, but may be polyphenylene sulfide (PPS), polyethylene terephthalate ( Other resin materials such as PET) and metals may be used.

  The outflow portions 212 and 213 are circular portions arranged on the side surface of the member main body 211. Specifically, four circular outflow portions 212 in two rows and two columns are arranged on the first surface 211a, which is the side surface on the negative side in the Y-axis direction of the member main body 211, and the Y-axis direction plus of the member main body 211 is positive. Four circular outflow portions 213 in 2 rows and 2 columns are arranged on the second surface 211b which is the side surface on the side.

  That is, the outflow portions 212 and 213 are formed on at least one of the first surface 211 a and the second surface 211 b of the member main body 211 of the liquid outflow member 210. Here, the 1st surface 211a is a surface facing the electrical storage element 100, and the 2nd surface 211b is a surface on the opposite side to the 1st surface 211a. In the present embodiment, the second surface 211 b is also a surface facing the power storage element 100.

  The outflow portions 212 and 213 are portions that allow the liquid contained inside the member main body 211 to flow out to the outside of the liquid outflow member 210 with a predetermined pressure. That is, the outflow portions 212 and 213 release the internal pressure of the liquid outflow member 210 and cause the liquid to flow out of the liquid outflow member 210 when the pressure inside the liquid outflow member 210 exceeds a predetermined pressure.

  Specifically, the outflow portions 212 and 213 are broken when the internal pressure of the liquid outflow member 210 exceeds a predetermined pressure, for example, because the thickness is smaller than that of the liquid outflow member 210 or a notch is formed. The liquid stored in the main body 211 is caused to flow out of the liquid outflow member 210. Here, the predetermined pressure is, for example, a pressure between 2 to 4 atmospheres.

  More specifically, the outflow portions 212 and 213 are at a pressure corresponding to a temperature (for example, 100 to 150 ° C.) that is equal to or lower than a temperature (for example, 140 to 170 ° C.) at which the safety valve 115 of the adjacent power storage element 100 is opened. The liquid is caused to flow out of the liquid outflow member 210. That is, the outflow portions 212 and 213 desirably allow the liquid in the member main body 211 to flow out of the liquid outflow member 210 before the safety valve 115 of the adjacent power storage element 100 is opened.

  As shown in FIG. 5, the holding member 220 is disposed between the outflow portion 212 and the Y-axis direction negative side storage element 100 (not shown), and the holding member 230 includes the outflow portion 213 and the Y axis. It is arranged between the storage element 100 on the plus side of the direction. For this reason, the liquid that flows out from the outflow portion 212 is absorbed by the holding member 220 and evaporates, thereby cooling the storage element 100 on the negative side in the Y-axis direction. Further, the liquid flowing out from the outflow portion 213 is absorbed by the holding member 230 and evaporated, thereby cooling the power storage element 100 on the Y axis direction plus side.

  Note that the arrangement of the outflow portions 212 and 213 is not limited to 2 rows and 2 columns, and may be any arrangement. The number of outflow portions 212 and 213 is not limited to four, and any number may be formed. It may be. In addition, the liquid outflow member 210 may have only one outflow portion of the outflow portions 212 and 213.

  As described above, according to power storage module 10 as the power storage device according to Embodiment 1 of the present invention, liquid outflow member 210 containing liquid is provided on the side of power storage element 100, and liquid outflow member 210 is , Outflow portions 212 and 213 for allowing the liquid to flow outward at a predetermined pressure. That is, when the storage element 100 generates heat and the outflow portions 212 and 213 reach a predetermined pressure, the outflow portions 212 and 213 cause the liquid to flow out of the liquid outflow member 210. As a result, the liquid evaporates due to contact with the power storage element 100 or the like, and the power storage element 100 is cooled by an endothermic reaction at the time of evaporation. For this reason, according to the electrical storage module 10, the electrical storage element 100 can be cooled rapidly.

  That is, the outflow portions 212 and 213 can rapidly cool the power storage element 100 by allowing the liquid to flow out of the liquid outflow member 210 when the internal pressure of the liquid outflow member 210 exceeds a predetermined pressure. .

  The outflow portions 212 and 213 are formed on at least one of the first surface 211 a and the second surface 211 b of the liquid outflow member 210. Here, the first surface 211 a of the liquid outflow member 210 is a surface facing the power storage element 100, and the second surface 211 b of the liquid outflow member 210 is another power storage element disposed on the side of the power storage element 100. 100 is a surface facing 100. For this reason, the liquid flowing out from the outflow portions 212 and 213 easily comes into contact with the power storage element 100 or another power storage element 100, so that the power storage element 100 can be rapidly cooled. For this reason, when a plurality of power storage elements 100 are arranged adjacent to each other, it is possible to prevent the heat of the power storage elements 100 that suddenly generated heat from being transferred to the adjacent power storage elements 100.

  The power storage module 10 further includes holding members 220 and 230 that hold the liquid that has flowed out from the outflow portions 212 and 213. Accordingly, the holding members 220 and 230 can hold the liquid that has flowed out by the outflow portions 212 and 213 and prevent the liquid from flowing out of the power storage module 10. Can be cooled.

  In addition, the outflow portions 212 and 213 cause liquid to flow out in order to cool the power storage element 100, but the liquid uses harmless, less corrosive, and highly safe water that does not ignite. Since water evaporates at 100 ° C. and has a large heat of evaporation, the use of water as the liquid can suppress the heat generation of the power storage element 100 to hundreds of degrees or less that may cause a malfunction event. For this reason, according to the electrical storage module 10, safety is high and the electrical storage element 100 can be cooled rapidly. Moreover, components other than water may be mixed in the liquid, and the evaporation temperature of the liquid can be controlled by components other than the water.

  In addition, since the liquid outflow member 210 is disposed between the two power storage elements 100, when the power storage element 100 abnormally generates heat, heat transfer to the adjacent power storage element 100 can be suppressed. Thus, when a certain power storage element 100 abnormally generates heat, heat is transmitted to the adjacent power storage element 100, and heat is further transmitted to the adjacent power storage element 100. It is possible to suppress chain transmission.

  Further, the outflow portions 212 and 213 cause the liquid to flow out of the liquid outflow member 210 before the safety valve 115 of the adjacent power storage element 100 is opened to prevent the temperature of the adjacent power storage element 100 from rising, It is possible to prevent the safety valve 115 of the adjacent power storage element 100 from opening in a chain manner.

(Modification 1 of Embodiment 1)
Next, a first modification of the first embodiment will be described. In the first embodiment, the liquid outflow member 210 has the outflow portions 212 and 213 that allow the liquid to flow out of the liquid outflow member 210 at a predetermined pressure. However, in this modification, the liquid outflow member has an outflow portion that allows the liquid to flow out of the liquid outflow member at a predetermined temperature.

  FIG. 6 is an exploded perspective view showing a configuration of cooling device 400 by disassembling a part of the power storage module according to Modification 1 of Embodiment 1 of the present invention. FIG. 7 is a perspective view showing the appearance of the liquid outflow member 410 according to Modification 1 of Embodiment 1 of the present invention. FIG. 8 is a perspective view showing a positional relationship between cooling device 400 and power storage element 100 according to Modification 1 of Embodiment 1 of the present invention.

  First, as shown in FIG. 6, the cooling device 400 is disposed between two adjacent power storage elements 100 as in the first embodiment, and includes a liquid outflow member 410 and holding members 420 and 430. I have.

  The liquid outflow member 410 is a rectangular container that is disposed on the side (long side surface side) of the power storage element 100 and contains the liquid inside. The liquid outflow member 410 has an outflow part (outflow part 412 in FIG. 6) that causes the liquid to flow out to the outside of the liquid outflow member 410 at a predetermined temperature. In addition, about the shape and arrangement position of the liquid outflow member 410, since it is the same structure as the liquid outflow member 210 in the said Embodiment 1, detailed description is abbreviate | omitted.

  The holding members 420 and 430 are arranged on the side where the outflow part of the liquid outflow member 410 is arranged, and are sheet-like members that hold (absorb) the liquid that the outflow part has flowed out. Here, the holding member 420 has four through holes 421 into which the four outflow portions 412 of the liquid outflow member 410 are respectively inserted, and the holding member 430 includes the four outflow portions 413 ( 7) has four through-holes 431 into which each is inserted. In addition, about the other structure of the holding members 420 and 430, since it is the structure similar to the holding members 220 and 230 in the said Embodiment 1, detailed description is abbreviate | omitted.

  As shown in FIG. 7, the liquid outflow member 410 includes a member main body 411 and outflow portions 412 and 413 formed in the member main body 411. Here, since the member main body 411 has the same configuration as the member main body 211 in the first embodiment, detailed description thereof is omitted.

  The outflow portions 412 and 413 are portions that are arranged on the side surface of the member main body 411 and project in a disk shape. Specifically, four disk-shaped outflow portions 412 in two rows and two columns are arranged on the first surface 411a which is the side surface on the minus side in the Y-axis direction of the member main body 411, and the Y-axis direction plus of the member main body 411 is positive. Four disk-shaped outflow portions 413 of 2 rows and 2 columns are arranged on the second surface 411b which is the side surface on the side.

  That is, the outflow portions 412 and 413 are formed on at least one of the first surface 411 a and the second surface 411 b of the member main body 411 of the liquid outflow member 410. Here, the 1st surface 411a is a surface facing the electrical storage element 100, and the 2nd surface 411b is a surface on the opposite side to the 1st surface 411a. In the present modification, the second surface 411 b is also a surface facing the power storage element 100.

  Further, the outflow portions 412 and 413 are portions that allow the liquid stored inside the member main body 411 to flow out to the outside of the liquid outflow member 410 at a predetermined temperature. In other words, the outflow portions 412 and 413 pass through the through holes 421 and 431 of the holding members 420 and 430 and are in contact with the power storage element 100, and are melted at a predetermined temperature by the heat generation of the power storage element 100, so that the liquid The liquid is caused to flow out of the outflow member 410.

  Specifically, the outflow portions 412 and 413 are formed of a member that melts at a temperature lower than that of the member main body 411, so that when the temperature in the liquid outflow member 410 exceeds a predetermined temperature, the outflow portions 412 and 413 are melted. The liquid stored in the main body 411 is caused to flow out of the liquid outflow member 410.

  Here, the predetermined temperature is not the temperature of the entire liquid outflow member 410 but the temperature of the liquid outflow member 410 at a position close to the power storage element 100, for example, a temperature between 100 and 150 ° C. That is, the outflow portions 412 and 413 are melted due to the temperature of the liquid outflow member 410 at a position close to the electric storage element 100 being increased due to the electric storage element 100 being overheated. The material of the outflow portions 412 and 413 is not particularly limited as long as it melts at the predetermined temperature. For example, the outflow portions 412 and 413 are formed of a resin material such as polypropylene (PP) or polyethylene (PE).

  More specifically, the outflow portions 412 and 413 are at a temperature (for example, 100 to 150 ° C.) corresponding to a temperature equal to or lower than a temperature (for example, 140 to 170 ° C.) at which the safety valve 115 included in the adjacent power storage element 100 is opened. The liquid is caused to flow out of the liquid outflow member 410. That is, the outflow portions 412 and 413 cause the liquid in the member main body 411 to flow out of the liquid outflow member 410 before the safety valve 115 of the adjacent power storage element 100 is opened.

  Here, since the liquid accommodated in the member main body 411 is the same as the liquid accommodated in the member main body 211 in the said Embodiment 1, detailed description is abbreviate | omitted. The liquid is selected according to the magnitude of the temperature (for example, a temperature between 100 to 150 ° C.) set as the temperature at which the outflow portions 412 and 413 cause the liquid to flow out of the liquid outflow member 410. The

  Further, as shown in FIG. 8, the holding member 420 is disposed between the member main body 411 and the Y-axis direction negative side storage element 100 (not shown), and the holding member 430 includes the member main body 411 and the Y axis. It is arranged between the storage element 100 on the plus side of the direction. For this reason, the liquid that flows out from the outflow portion 412 is absorbed by the holding member 420 and evaporates, thereby cooling the storage element 100 on the negative side in the Y-axis direction. Further, the liquid flowing out from the outflow portion 413 is absorbed by the holding member 430 and evaporated, thereby cooling the power storage element 100 on the Y axis direction plus side.

  Note that the arrangement of the outflow portions 412 and 413 is not limited to 2 rows and 2 columns, and may be any arrangement, and the number of outflow portions 412 and 413 is not limited to four, and any number may be formed. It may be. Further, the liquid outflow member 410 may have only one outflow portion of the outflow portions 412 and 413. In addition, the outflow portions 412 and 413 are not formed in the liquid outflow member 410, but the entire liquid outflow member 410 is formed of the same material as the outflow portions 412 and 413, and the entire liquid outflow member 410 serves as the outflow portion. A functioning configuration may be used.

  As described above, according to the power storage module according to the first modification of the first embodiment of the present invention, the liquid outflow member 410 containing the liquid is provided on the side of the power storage element 100, Outflow portions 412 and 413 for allowing the liquid to flow outward at a predetermined temperature are provided. That is, when the storage element 100 generates heat and the outflow portions 412 and 413 reach a predetermined temperature, the outflow portions 412 and 413 cause the liquid to flow out of the liquid outflow member 410. For this reason, according to the said electrical storage module, the electrical storage element 100 can be cooled rapidly.

  That is, the outflow portions 412 and 413 can rapidly cool the power storage element 100 that has exceeded a certain temperature by melting at a predetermined temperature and allowing the liquid to flow out of the liquid outflow member 410.

(Modification 2 of Embodiment 1)
Next, a second modification of the first embodiment will be described. In the first modification, the liquid outflow member 410 has the outflow portions 412 and 413 that allow the liquid to flow out of the liquid outflow member 410 at a predetermined temperature. However, in this modification, the liquid outflow member further has a pressure release portion that releases the internal pressure of the liquid outflow member before the outflow portion melts at a predetermined temperature.

  FIG. 9 is a perspective view showing an appearance of a liquid outflow member 510 according to Modification 2 of Embodiment 1 of the present invention.

  As shown in the figure, the liquid outflow member 510 has a member main body 511, outflow portions 512 and 513 (not shown) formed in the member main body 511, and a pressure release portion 514. Here, since the member main body 511 and the outflow portions 512 and 513 have the same configurations as the member main body 411 and the outflow portions 412 and 413 in the first modification, detailed description thereof is omitted. That is, the liquid outflow member 510 has a configuration in which the pressure release portion 514 is formed in the liquid outflow member 410 in the first modification.

  The pressure release portion 514 is a circular safety valve that is formed on the upper surface of the member main body 511 and releases the internal pressure of the liquid outflow member 510. In other words, the pressure release portion 514 is broken when the internal pressure of the liquid outflow member 510 exceeds a predetermined pressure due to being formed thinner than the liquid outflow member 510 or a notch is formed. Release internal pressure.

  Specifically, the pressure release part 514 releases the internal pressure of the liquid outflow member 510 before the outflow parts 512 and 513 are melted at a predetermined temperature. That is, the pressure release portion 514 prevents the outflow portions 512 and 513 from being broken because the internal pressure of the liquid outflow member 510 becomes too high before the temperature of the liquid in the liquid outflow member 510 reaches the predetermined temperature. Have a role. Here, the pressure release portion 514 is set so as to be released at a pressure smaller than the pressure at which the outflow portions 512 and 513 are broken.

  The shape of the pressure release portion 514 is not limited to a circular shape, and may be any shape, and the arrangement position of the pressure release portion 514 is not the upper surface of the member body 511 but the member body 511. It may be formed on the upper part of the side surface.

  As described above, according to the power storage module according to Modification 2 of Embodiment 1 of the present invention, liquid outflow member 510 has a high internal pressure before outflow portions 512 and 513 are melted at a predetermined temperature. In addition, since the internal pressure can be released by the pressure release portion 514, the outflow portions 512 and 513 can be prevented from being broken by the internal pressure. For this reason, it is possible to prevent liquid from flowing out from the outflow portions 512 and 513 before the outflow portions 512 and 513 are melted at a predetermined temperature, and to allow the liquid to flow out from the outflow portions 512 and 513 with high accuracy.

(Modification 3 of Embodiment 1)
Next, a third modification of the first embodiment will be described. In the first embodiment, the liquid sealed in the liquid outflow member 210 flows out from the outflow portions 212 and 213. However, in this modification, the liquid is supplied from the liquid supply unit to the liquid outflow member, and the liquid flows out from the outflow unit.

  FIG. 10 is a perspective view showing an appearance of a liquid supply unit 600 that supplies a liquid to cooling device 200 according to Modification 3 of Embodiment 1 of the present invention.

  As shown in the figure, a liquid supply unit 600 is arranged above the cooling device 200 shown in the first embodiment. Specifically, the liquid supply unit 600 is disposed above the power storage element 100 on the side of the cooling device 200. Since the configuration other than the liquid supply unit 600 is the same as that of the first embodiment, detailed description thereof is omitted.

  Here, the liquid supply unit 600 is a rectangular container in which a liquid is accommodated, and is connected to the liquid outflow member 210 so that the liquid can be supplied. In other words, the liquid supply unit 600 is connected to the liquid outflow member 210 via the connection pipe 610 and supplies the liquid to the liquid outflow member 210 through the connection pipe 610. Specifically, when the liquid stored in the liquid outflow member 210 flows out of the liquid outflow member 210 from the outflow portions 212 and 213, the liquid is supplied from the liquid supply unit 600 to the liquid outflow member 210. Thus, the replenished liquid flows out of the liquid outflow member 210 from the outflow portions 212 and 213.

  As described above, the liquid outflow member 210 plays a role of supplying the liquid supplied from the liquid supply unit 600 inward and allowing the liquid supplied inward to flow out outward. In other words, the liquid outflow member 210 plays a role like a faucet.

  The liquid supply unit 600 may have a hole for taking in air when supplying the liquid to the liquid outflow member 210. In order to prevent the liquid from evaporating from the hole, the hole is preferably configured to be closed when the liquid is not supplied.

  The liquid supply unit 600 may be a resin container or a metal container. The liquid supply unit 600 may be disposed on the side of the power storage element 100, but is preferably disposed above the liquid outflow member 210 in order to supply the liquid outflow member 210. Further, the shape of the liquid supply unit 600 is not limited to a rectangular shape.

  As described above, according to the power storage module according to the third modification of the first embodiment of the present invention, the liquid supply unit 600 that supplies the liquid to the liquid outflow member 210 is further provided. Even when the amount of liquid stored in the battery is small, a large amount of liquid can be used for cooling the power storage element 100, and the power storage element 100 can be rapidly cooled. Moreover, the liquid outflow member 210 can be made small, and the apparatus can be made compact.

(Embodiment 2)
Next, Embodiment 2 will be described. In Embodiment 1 above, cooling device 200 is provided in power storage module 10, but in Embodiment 2, the cooling device is provided in a power storage pack having a plurality of power storage modules 10.

  FIG. 11 is a perspective view showing an arrangement position of the cooling device 700 according to Embodiment 2 of the present invention. Specifically, the figure is a perspective view showing an external appearance of a power storage pack having a plurality of power storage modules. FIG. 12 is a perspective view showing a positional relationship between cooling device 700 and power storage module 10 according to Embodiment 2 of the present invention.

  First, as illustrated in FIG. 11, the power storage pack 1 is a power storage device (battery pack) including three power storage modules 10. Note that the power storage pack 1 may have a configuration including two or four or more power storage modules 10.

  In addition, the power storage pack 1 includes a cooling device 700 between two adjacent power storage modules 10 among the three power storage modules 10. And the cooling device 700 is provided with the liquid outflow member 710 and the holding members 720 and 730, as shown in FIG. Here, the configuration of the liquid outflow member 710 and the holding members 720 and 730 included in the cooling device 700 is the same as the liquid outflow member 210 and the holding members 220 and 230 included in the cooling device 200 in the first embodiment. Detailed description will be omitted.

  That is, the liquid outflow member 710 is a container that is disposed on the side of the power storage module 10 including the plurality of power storage elements 100 and that stores liquid therein. Further, the liquid outflow member 710 has an outflow portion 712 that causes the liquid to flow out to the outside of the liquid outflow member 710 at a predetermined temperature or pressure.

  Here, the outflow portion 712 causes the liquid to flow out of the liquid outflow member 710 at a temperature or pressure corresponding to a temperature equal to or lower than the temperature at which the safety valve 115 of the power storage element 100 of the power storage module 10 is opened.

  Note that the cooling device 700 may not be disposed between all the power storage modules 10. That is, in this embodiment, two cooling devices 700 are arranged, but the number of cooling devices 700 may be one. Further, the cooling device 700 is not between the two power storage modules 10 but the side surface of the power storage pack 1 (for example, the surface on the positive side of the X-axis direction of the power storage module 10 at the X-axis direction positive side end in FIG. It may be arranged on the surface of the pack 1 on the negative side in the Y-axis direction).

  In addition, the liquid outflow member 710 and the holding members 720 and 730 may be arranged at any position, but when the power storage pack 1 is provided with a fan or the like for cooling the power storage pack 1 with air, It is preferable to arrange the air passage in such a position. Similarly, the shapes of the liquid outflow member 710 and the holding members 720 and 730 preferably have a shape that secures the air passage, for example, by providing holes in the holding members 720 and 730.

  As described above, according to the power storage pack 1 as the power storage device according to the second embodiment of the present invention, the liquid outflow member 710 that stores liquid is provided on the side of the power storage module 10, and the liquid outflow member 710 is provided. Has an outflow portion 712 that allows the liquid to flow outward at a predetermined temperature or pressure. That is, when the power storage module 10 generates heat and the outflow portion 712 reaches a predetermined temperature or the internal pressure of the liquid outflow member 710 reaches a predetermined pressure, the outflow portion 712 causes liquid to flow outward from the liquid outflow member 710. To flow. As a result, the liquid evaporates due to contact with the power storage module 10 or the like, and the power storage module 10 is cooled by an endothermic reaction when evaporating. For this reason, according to the electrical storage pack 1, the electrical storage module 10 can be rapidly cooled.

  In addition, since the liquid outflow member 710 is disposed between the two power storage modules 10, when the power storage module 10 abnormally generates heat, it is possible to suppress the transfer of heat to the adjacent power storage module 10. As a result, when a certain power storage module 10 abnormally generates heat, heat is transmitted to the adjacent power storage module 10 and further heat is transmitted to the adjacent power storage module 10. It is possible to suppress chain transmission.

  In addition, the outflow portion 712 causes the liquid to flow out of the liquid outflow member 710 before the safety valve 115 of the power storage element 100 included in the adjacent power storage module 10 is opened, thereby increasing the temperature of the adjacent power storage module 10. It is possible to prevent the safety valve 115 of the power storage element 100 of the adjacent power storage module 10 from opening.

  In addition, the structure which applied each component of the said Embodiment 1 and its modifications 1-3 to the said Embodiment 2 may be sufficient. That is, for example, the liquid outflow member 710 may have a pressure release portion that releases the internal pressure of the liquid outflow member 710 before the outflow portion 712 is melted at a predetermined temperature, or liquid is supplied to the liquid outflow member 710. You may provide the liquid supply part connected so that supply was possible.

  As described above, in the second embodiment, the power storage device 100 in the first embodiment is replaced with the power storage module 10, but the power storage module 10 in the second embodiment is replaced with a battery pack. It doesn't matter. That is, a configuration may be adopted in which a liquid outflow member is provided on the side of the electricity storage pack so that the inner liquid flows out at a predetermined temperature or pressure.

  The power storage module 10 and the power storage pack 1 as the power storage device according to the embodiment of the present invention and the modifications thereof have been described above, but the present invention is not limited to the above embodiment and the modifications thereof. In other words, it should be considered that the embodiment and its modification disclosed this time are illustrative and not restrictive in all respects. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  For example, in the above-described embodiment and its modification, the cooling device is configured to include the holding member, but the cooling device may be configured not to include the holding member.

  Moreover, in the said embodiment and its modification, the electrical storage module 10 as an electrical storage apparatus was provided with the some electrical storage element, the some cooling device, and the exterior body. However, the power storage device may have a configuration including only one power storage element and one cooling device arranged on the side of the one power storage element.

  Moreover, the form constructed | assembled combining the said embodiment and the said modification arbitrarily is also contained in the scope of the present invention. For example, a configuration in which the first or second modification of the first embodiment is applied to the third modification of the first embodiment may be used.

  The present invention can be applied to a power storage module in which power storage elements such as a plurality of lithium ion secondary batteries are accommodated.

DESCRIPTION OF SYMBOLS 1 Power storage pack 10 Power storage module 100 Power storage element 110 Element container 111 Cover plate 112 Positive electrode current collector 113 Negative electrode current collector 114 Electrode body 115 Safety valve 120 Positive electrode terminal 130 Negative electrode terminal 200, 400, 700 Cooling device 210, 410, 510, 710 Liquid outflow member 211, 411, 511 Member main body 211a, 411a First surface 211b, 411b Second surface 212, 213, 412, 413, 512, 513, 712 Outflow portion 220, 230, 420, 430, 720, 730 Holding member 300 exterior body 421,431 through hole 514 pressure release part 600 liquid supply part 610 connecting pipe

Claims (10)

A power storage device having one or more power storage elements,
A liquid outflow member that is disposed on the side of the power storage element and that stores or supplies liquid therein is provided.
The liquid outflow member has an outflow portion that causes the liquid to flow out to the outside of the liquid outflow member at a predetermined temperature or pressure. The said outflow part is formed in the at least 1 surface of the 1st surface of the said liquid outflow member facing the said electrical storage element, and the 2nd surface on the opposite side to a said 1st surface. Power storage device. further,
The power storage device according to claim 1, further comprising: a holding member that is disposed on a side where the outflow portion of the liquid outflow member is disposed, and holds the liquid that has flowed out from the outflow portion. The outflow part releases the internal pressure of the liquid outflow member and causes the liquid to outflow to the outside of the liquid outflow member when the pressure inside the liquid outflow member exceeds the predetermined pressure. The electrical storage apparatus of any one of -3. The power storage device according to any one of claims 1 to 4, wherein the outflow portion melts at the predetermined temperature to cause the liquid to flow out of the liquid outflow member. The power storage device according to claim 5, wherein the liquid outflow member further includes a pressure release portion that releases an internal pressure of the liquid outflow member before the outflow portion melts at the predetermined temperature. The power storage device according to claim 1, further comprising a liquid supply unit that contains the liquid and is connected to the liquid outflow member so that the liquid can be supplied. The power storage device according to claim 1, wherein the liquid includes at least water. The liquid outflow member is disposed between the power storage element and another power storage element adjacent to the power storage element,
The outflow part causes the liquid to flow out to the outside of the liquid outflow member at a temperature or pressure corresponding to a temperature equal to or lower than a temperature at which a safety valve of the other power storage element is opened. 2. The power storage device according to item 1. A power storage device comprising a power storage module having a plurality of power storage devices,
A liquid outflow member that is disposed on the side of the power storage module and that stores or supplies liquid therein is provided.
The liquid outflow member has an outflow portion that causes the liquid to flow out to the outside of the liquid outflow member at a predetermined temperature or pressure.

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