JP6503216B2 - Method of testing storage device, method of testing storage device, method of manufacturing storage device, and method of manufacturing storage device - Google Patents

Description

  The present invention provides a method of testing a chargeable / dischargeable storage element, a method of testing a power storage device provided with a chargeable / dischargeable storage element, a method of manufacturing a power storage element using the check method of the power storage element, and a method of testing the power storage device. And a method of manufacturing a power storage device using the

  2. Description of the Related Art Conventionally, a method of inspecting a secondary battery for detecting a metal deposited on a negative electrode that causes micro short (fine short) is known (see Patent Document 1). Specifically, in this inspection method, first, the secondary battery is charged for the first time in a temperature range of −25 ° C. to 15 ° C., and then charge and discharge are repeated. Subsequently, the secondary battery is aged under a 25 ° C. environment. Then, the voltage of the secondary battery is measured before and after aging, and a micro short between the positive electrode and the negative electrode is detected from the voltage difference before and after aging.

  In the above inspection method, the occurrence of the micro short is detected from the voltage drop caused by the micro short. For this reason, when the metal deposited on the negative electrode penetrates the separator and does not reach the positive electrode, a micro short circuit does not occur. Therefore, the metal deposited on the negative electrode may be detected by the above inspection method. Can not.

  Therefore, an inspection method and manufacturing method of a secondary battery etc. which can detect a minute short circuit more accurately are desired.

JP 2005-209528 A

  Therefore, the present invention has an object of providing an inspection method of a storage element capable of detecting a slight short circuit more accurately, an inspection method of a storage device provided with a storage element, a method of manufacturing a storage element, and a method of manufacturing a storage device. Do.

The inspection method of a storage element according to the present invention is
An electrode assembly including a separator and a positive electrode and a negative electrode alternately stacked via the separator, and a case of a storage element having a case for housing the electrode assembly, the positive electrode and the negative electrode from the outside of the case Applying a force in the stacking direction,
Cooling the storage element;
Measuring an electrical property of the storage element in the cooled state in which the force is applied.

  According to this configuration, since the force in the stacking direction is applied to the electrode assembly through the case, the positive electrode and the negative electrode come close to each other, whereby metal (such as metal powder) is present between the positive electrode and the negative electrode. If the metal is deposited on the negative electrode (if the metal does not allow the positive electrode and the negative electrode to conduct when the force is not applied or if the metal is present or precipitated), then the positive electrode and the negative electrode are conducted (that is, The short circuit can be detected accurately by measuring the electrical characteristics of the storage element in this state. That is, when a metal is present between the positive electrode and the negative electrode by applying the force in the laminating direction to the electrode body, or when the metal is slightly precipitated in the negative electrode, a micro short circuit caused by these metals is The short circuit can be detected in the body, thereby measuring the electrical characteristics.

  Moreover, since the storage element is cooled and the pressure in the case is reduced, the force in the stacking direction via the case is efficiently applied to the electrode body, whereby metal is present between the positive electrode and the negative electrode, or Even when metals are deposited on the negative electrode, etc., it is possible to more reliably cause a micro short circuit caused by these metals.

in this case,
When the force is applied, the force is provided by a pair of holding members disposed on both sides of the case in the stacking direction, and a metal connection portion extending in the stacking direction and connecting the pair of holding members. Add to the case,
In the cooling, it is more preferable to cool the pair of holding members and the connection portion together with the storage element.

  According to this configuration, since the metal connection portion is shrunk by cooling, a force in the stacking direction caused by the contraction of the connection portion is applied to the electrode body from the pair of sandwiching members, whereby A greater force is applied to the electrode body. For this reason, in the storage element (electrode body), even when there is a slight metal between the positive electrode and the negative electrode, or even when the metal is slightly deposited on the negative electrode, a slight short circuit caused by these metals is caused. Can.

Moreover, the inspection method of the storage battery according to the present invention is
An electric storage device comprising: an electrode body including a separator and a positive electrode and a negative electrode alternately stacked via the separator; and at least one electric storage element having a case for housing the electrode body. Applying a force in the stacking direction of the positive electrode and the negative electrode from the outside of the case;
Cooling the storage element;
Measuring an electrical property of the storage element in the cooled state in which the force is applied.

  According to this configuration, in the power storage device constituting the power storage device, the force in the stacking direction is applied to the electrode body through the case, so that the positive electrode and the negative electrode approach each other in the electrode body, whereby the positive electrode and the negative electrode If there is a metal (such as metal powder) between them or if the metal is deposited on the negative electrode (if there is a metal that does not allow the positive electrode and the negative electrode to conduct when the force is not applied) And so on, and the electrical characteristics of the storage element are measured in this state, whereby the micro short circuit can be detected with high accuracy. That is, by applying a force in the stacking direction to the electrode body of the storage element constituting the storage device, a slight metal is present between the positive electrode and the negative electrode in the electrode body, or in the negative electrode of the electrode body In the case where the metal is slightly precipitated, a micro short circuit caused by the metal can be generated, whereby the micro short circuit can be detected with high accuracy by measuring the electrical characteristics.

  Moreover, since the storage element is cooled and the pressure in the case is reduced, the force in the stacking direction via the case is efficiently applied to the electrode body, whereby a slight metal is present between the positive electrode and the negative electrode. Also, even when a slight amount of metal is deposited on the negative electrode, a micro short circuit due to these metals can be more reliably generated.

In the inspection method of the power storage device,
The power storage device includes a plurality of the power storage elements.
When applying the force, a force is applied to the respective cases of the plurality of storage elements from the outside of the case in the stacking direction of the positive electrode and the negative electrode,
In the measurement of the electrical property, the electrical property of each of the plurality of storage elements may be measured.

  According to this configuration, in each of the plurality of power storage devices constituting the power storage device, fineness attributed to these metals is present when metal is present between the positive electrode and the negative electrode, or when metal is deposited on the negative electrode, etc. A short circuit can be generated, and the measurement of the electrical property can detect the short circuit.

Moreover, in the inspection method of the said electrical storage apparatus,
The power storage device is a holding member for holding the power storage element, and connects the pair of end members disposed on both sides of the power storage element in the stacking direction and the pair of end members extending in the stacking direction A holding member having a metallic connection portion,
The holding member applies the force to the storage element;
In the cooling, the holding member may be cooled together with the storage element.

  According to this configuration, the holding member applies a force in the stacking direction to the electrode body, that is, by using the clamping force by the holding member, the holding device and the like are not used separately from the power storage device. The above force can be applied to the electrode body, and thereby, when a metal is present between the positive electrode and the negative electrode, or when a metal is deposited on the negative electrode, a micro short circuit due to these metals is more reliably generated. It can be done.

  In addition, since the metal connection portion is shrunk by the cooling, the force in the stacking direction caused by the contraction of the connection portion is also applied to the electrode body from the pair of end members through the case, whereby A large force is applied to the electrode body. That is, it is possible to apply a greater force in the stacking direction to the electrode body by utilizing the tightening force caused by the contraction of the connection portion caused by the cooling of the holding member. For this reason, in the storage element (electrode body), even when there is a slight metal between the positive electrode and the negative electrode, or even when the metal is slightly deposited on the negative electrode, a slight short circuit caused by these metals is caused. Can.

Further, a method of manufacturing a storage element according to the present invention is:
An electrode assembly including a separator and a positive electrode and a negative electrode alternately stacked via the separator is housed in a case to form a storage element;
After the formation of the storage element, performing any one of the above-described storage element inspection methods.

  According to this configuration, when a metal is present between the positive electrode and the negative electrode, or when the metal is deposited on the negative electrode, etc., this can be detected as a slight short circuit. It is possible to prevent the use of the device.

Further, a method of manufacturing a power storage device according to the present invention is:
Forming a storage element by housing an electrode body including a separator and a positive electrode and a negative electrode stacked alternately via the separator in a case;
After the formation of the storage element, performing any one of the above-described storage device inspection methods.

  According to this configuration, in the electrode body of the storage element constituting the storage device, even when metal is present between the positive electrode and the negative electrode or when metal is deposited on the negative electrode, this is detected as a slight short circuit. Therefore, it is possible to prevent the use of a storage device provided with a storage element in a state in which the metal is present.

  As described above, according to the present invention, a method of inspecting a storage element capable of detecting a minute short circuit more accurately, a method of testing a storage device provided with a storage element, a method of manufacturing a storage element, and a method of manufacturing a storage device are provided. Can.

FIG. 1 is a perspective view of a power storage device according to the first embodiment. FIG. 2 is a perspective view of a storage element constituting the storage device. FIG. 3 is an exploded perspective view of the storage element. FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. FIG. 5 is a diagram for explaining an electrode body of the storage element. FIG. 6 is an exploded perspective view of the power storage device. FIG. 7 is a flowchart for explaining the method of manufacturing the power storage device. FIG. 8 is a schematic view for explaining an inspection of the power storage device. FIG. 9 is a flow chart for explaining an inspection of metal deposited on the negative electrode of the storage element constituting the storage device. FIG. 10 is a flowchart for explaining an inspection of the metal deposited on the negative electrode of the storage element according to the second embodiment. FIG. 11 is a perspective view for explaining a clamping device for clamping the storage element. FIG. 12 is a flowchart for explaining the method of manufacturing the storage element.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 9. In addition, the name of each component (each component) of each following embodiment including this embodiment is a thing in the said embodiment, and when different from the name of each component (each component) in a background art, is there.

  In the following, first, a power storage device to be tested will be described, and then a method of testing the power storage device and a method of manufacturing the power storage device using the test method will be described.

  The power storage device includes at least one power storage element 1 as shown in FIG. Specifically, the storage device includes a plurality of storage elements 1, a plurality of spacers 2 adjacent to the storage element 1, and a holding member 3 for holding the plurality of storage elements 1 and the plurality of spacers 2 collectively. The holding member 3 is made of metal. Therefore, the power storage device includes an insulator 4 between the power storage element 1 and the holding member 3 to insulate the power storage element 1 from the holding member 3.

  The storage element includes, as shown in FIGS. 2 to 5, an electrode assembly 5 including a positive electrode 53 and a negative electrode 54, and a case 10 for housing the electrode assembly 5. In addition to the electrode body 5 and the case 10, the storage element 1 includes an external terminal 11 disposed outside the case 10, a current collector 12 for electrically connecting the electrode body 5 and the external terminal 11, and the like.

  The electrode body 5 is a laminated body 52 in which the core 51 and the positive electrode 53 and the negative electrode 54 are laminated in a state where they are insulated from each other, and includes the laminated body 52 wound around the core 51. . When lithium ions move between the positive electrode 53 and the negative electrode 54 in the electrode body 5, the storage element 1 is charged and discharged.

  The core 51 is usually formed of an insulating material. The winding core 51 has a tubular shape. The core 51 of the present embodiment has a flat cylindrical shape. The core 51 of the present embodiment is formed by winding a sheet having flexibility or thermoplasticity.

  The sheet is formed of a synthetic resin. The sheet is resistant to the electrolyte. The sheet is made of, for example, polypropylene (PP), polyethylene (PE), polyphenylene sulfide (PPS), polyethylene terephthalate (PET). The sheet of the present embodiment is made of, for example, polypropylene. The material of the sheet constituting the winding core 51 is not limited to a synthetic resin, and may be a metal such as aluminum or copper.

  The laminate 52 is formed by winding the positive electrode 53 and the negative electrode 54 around the winding core 51 in a stacked state (stacked).

  The positive electrode 53 has a metal foil and a positive electrode active material layer formed on the metal foil. The metal foil is band-shaped. The metal foil of the present embodiment is, for example, an aluminum foil. The positive electrode 53 has a non-coated portion (a portion where the positive electrode active material layer is not formed) 531 of the positive electrode active material layer at one end of the width direction which is the short direction of the band shape. A portion of the positive electrode 53 where the positive electrode active material layer is formed is referred to as a covering portion 532.

  The positive electrode active material layer has a positive electrode active material and a binder.

The positive electrode active material is, for example, a lithium metal oxide. Specifically, the positive electrode active material is, for example, _a composite oxide (Li _a Co _y O ₂ , Li _a Ni _x represented by Li _a Me _b O _c (Me represents one or more transition metals). O ₂ , Li _a Mn _z O ₄ , Li _a Ni _x Co _y Mn _z O _{2 and the} like, Li _a Me _b (XO _c ) _d (Me represents one or more transition metals, and X represents, for example, P , Si, B, and V) (Li _a Fe _b PO ₄ , Li _a Mn _b PO ₄ , Li _a Mn _b SiO ₄ , Li _a Co _b PO ₄ F, etc.). The positive electrode active material of the present embodiment is Li _1.05 Ni _0.167 Co _0.66 Mn _0.167 O ₂ .

  The binder used for the positive electrode active material layer is, for example, polyvinylidene fluoride (PVdF), a copolymer of ethylene and vinyl alcohol, polymethyl methacrylate, polyethylene oxide, polypropylene oxide, polyvinyl alcohol, polyacrylic acid, polymethacryl Acid, styrene butadiene rubber (SBR). The binder of the present embodiment is polyvinylidene fluoride.

  The positive electrode active material layer may further have a conductive aid such as ketjen black (registered trademark), acetylene black, or graphite. The positive electrode active material layer of the present embodiment has acetylene black as a conductive additive.

  The negative electrode 54 has a metal foil and a negative electrode active material layer formed on the metal foil. The metal foil is band-shaped. The metal foil of the present embodiment is, for example, a copper foil. In the negative electrode 54, a non-coated portion of a negative electrode active material layer (a negative electrode active material layer is formed on the other edge (the opposite side of the non-coated portion 531 of the positive electrode 53) of the width direction Portion 541). The width of the covering portion (portion where the negative electrode active material layer is formed) 542 of the negative electrode 54 is larger than the width of the covering portion 532 of the positive electrode 53.

  The negative electrode active material layer has a negative electrode active material and a binder.

  The negative electrode active material is, for example, a carbon material such as graphite, non-graphitizable carbon, and graphitizable carbon, or a material that causes an alloying reaction with lithium ions such as silicon (Si) and tin (Sn). The negative electrode active material of the present embodiment is non-graphitizable carbon.

  The binder used for the negative electrode active material layer is the same as the binder used for the positive electrode active material layer. The binder of the present embodiment is polyvinylidene fluoride.

  The negative electrode active material layer may further have a conductive aid such as ketjen black (registered trademark), acetylene black, or graphite. The negative electrode active material layer of the present embodiment does not have a conductive support agent.

  In the electrode body 5 of the present embodiment, the positive electrode 53 and the negative electrode 54 configured as described above are wound in a state of being insulated by the separator 55. That is, in the electrode body 5 of the present embodiment, the laminate 52 of the positive electrode 53, the negative electrode 54, and the separator 55 is wound.

  The separator 55 is a member having an insulating property. The separator 55 is disposed between the positive electrode 53 and the negative electrode 54. Thereby, the positive electrode 53 and the negative electrode 54 are mutually insulated in the electrode body 5 (specifically, the laminate 52). Further, the separator 55 holds the electrolytic solution in the case 10. Thereby, at the time of charge and discharge of the storage element 1, lithium ions move between the positive electrode 53 and the negative electrode 54 which are alternately stacked via the separator 55.

The separator 55 has a belt shape. The separator 55 is made of, for example, a porous film of polyethylene, polypropylene, cellulose, polyamide or the like. The separator 55 is formed by providing an inorganic layer containing inorganic particles such as SiO ₂ particles, Al ₂ O ₃ particles, boehmite (alumina hydrate) on a base material formed of a porous film. It is also good. The separator 55 of this embodiment is made of, for example, polyethylene. The width of the separator (the dimension in the widthwise direction of the band shape) is slightly larger than the width of the covering portion 542 of the negative electrode 54. The separator 55 is disposed between the positive electrode 53 and the negative electrode 54 which are overlapped in a state of being misaligned in the width direction such that the covering portions 532 overlap each other. At this time, the non-coated portion 531 of the positive electrode 53 and the non-coated portion 541 of the negative electrode 54 do not overlap. That is, the non-coated portion 531 of the positive electrode 53 protrudes in the width direction from the overlapping region of the positive electrode 53 and the negative electrode 54, and the non-coated region 541 of the negative electrode 54 extends in the width direction from the overlapping region of the positive electrode 53 and the negative electrode 54 It protrudes in the direction opposite to the protrusion direction of the non-coating part 531 of the positive electrode 53). The electrode body 5 is formed by winding the positive electrode 53, the negative electrode 54, and the separator 55, that is, the stacked body 52 in a stacked state. The non-coated laminated portion 56 in the electrode body 5 is configured by a portion where only the non-coated portion 531 of the positive electrode 53 or the non-coated portion 541 of the negative electrode 54 is laminated.

  The uncoated laminated portion 56 is provided on each electrode of the electrode body 5. That is, an uncoated laminated portion 56 in which only the uncoated portion 531 of the positive electrode 53 is laminated constitutes an uncoated laminated portion of the positive electrode in the electrode body 5 and an uncoated laminated portion in which only the uncoated portion 541 of the negative electrode 54 is laminated. 56 constitute an uncoated laminated portion of the negative electrode in the electrode body 5.

  In the electrode assembly 5 configured as described above, the flat portion 57 in which the positive electrode 53, the negative electrode 54, and the separator 55 are stacked in a substantially straight state, the positive electrode 53, the negative electrode 54, and the separator 55 are curved. And a curved portion 58 which is laminated. The electrode body 5 is housed in the case 10 so that the flat portion 57 is sandwiched between the case 10 (specifically, between a pair of long wall portions 100c described later) from the X-axis direction (lamination direction of the positive electrode 53 etc.) There is.

  The case 10 has a case main body 100 having an opening, and a lid plate 101 that closes (closes) the opening of the case main body 100. The case 10 accommodates the electrolytic solution in the internal space 13 (see FIG. 4) together with the electrode body 5 and the current collector 12 and the like. The case 10 is formed of a metal resistant to the electrolyte. The case 10 of the present embodiment is formed of, for example, an aluminum-based metal material such as aluminum or an aluminum alloy.

The electrolyte is a non-aqueous electrolyte. The electrolytic solution is obtained by dissolving an electrolyte salt in an organic solvent. The organic solvent is, for example, cyclic carbonates such as propylene carbonate and ethylene carbonate, linear carbonates such as dimethyl carbonate, diethyl carbonate, and ethyl methyl carbonate. The electrolyte salt is LiClO ₄ , LiBF ₄ , LiPF ₆ or the like. Electrolyte of the present embodiment, propylene carbonate, dimethyl carbonate, and ethyl methyl carbonate, propylene carbonate: dimethyl carbonate: ethylmethyl carbonate = 3: 2: in a mixed solvent adjusted at a ratio of 5, 1 mol / L LiPF ₆ Was dissolved.

  Case 10 is formed by joining in the state which the opening peripheral part 102 of case main body 100 and the peripheral part of lid plate 101 were piled up. Also, the case 10 has an internal space 13 defined by the case body 100 and the cover plate 101. In the present embodiment, the opening peripheral edge portion 102 of the case main body 100 and the peripheral edge portion of the lid plate 101 are joined by welding.

  The case main body 100 includes a plate-like closing portion 100a and a cylindrical trunk portion 100b connected to the periphery of the closing portion 100a.

  The closed portion 100a is located at the lower end of the case body 100 when the case body 100 is disposed such that the opening is upward (that is, the bottom wall of the case body 100 when the opening is upward). ) Site. The closed portion 100a has a rectangular shape when viewed in the normal direction of the closed portion 100a.

  In the following, as shown in FIG. 3, the short side direction of the closed portion 100a is taken as the X axis direction in orthogonal coordinates, the long side direction of the closed portion 100a is taken as the Y axis direction in orthogonal coordinates, and the normal direction of the closed portion 100a ( Let thickness direction be the Z-axis direction in Cartesian coordinates.

  The body 100b of the present embodiment has a flat rectangular tube shape. The body 100b has a pair of long wall portions 100c extending from the long side in the peripheral edge of the closing portion 100a and a pair of short wall portions 100d extending from the short side in the peripheral edge of the closing portion 100a. That is, the pair of long wall portions 100c are opposed to each other with an interval in the Y axis direction (specifically, an interval corresponding to the short side in the peripheral edge of the closed portion 100a), and the pair of short wall portions 100d is an interval in the Y axis direction (In detail, the gap corresponds to the long side of the periphery of the closed portion 100a). By connecting the short wall portions 100d to the corresponding end portions of the pair of long wall portions 100c (specifically, facing in the X-axis direction), the rectangular cylindrical trunk portion 100b is formed.

  As described above, the case main body 100 has a rectangular tube shape (that is, a bottomed rectangular tube shape) in which one end in the opening direction (Z-axis direction) is closed.

  The lid plate 101 is a plate-like member that closes the opening of the case main body 100. Specifically, the cover plate 101 abuts on the case body 100 so as to close the opening of the case body 100. The lid plate 101 has an outline shape corresponding to the opening peripheral edge portion 102 of the case main body 100 when viewed in the Z-axis direction. That is, the cover plate 101 is a rectangular plate material long in the Y-axis direction when viewed in the Z-axis direction.

  The external terminal 11 is a portion electrically connected to an external terminal of another storage element or an external device. The external terminal 11 is formed of a conductive member. For example, the external terminal 11 is formed of a highly weldable metal material such as an aluminum-based metal material such as aluminum or aluminum alloy, or a copper-based metal material such as copper or a copper alloy. The external terminal 11 has a surface 110 to which a bus bar or the like can be welded. The surface 110 in the present embodiment is a plane.

  The current collector 12 is disposed in the case 10 and is connected to the electrode assembly 5 directly or indirectly in a conductive manner. The current collector 12 is formed of a conductive member and disposed along the inner surface of the case 10. In the storage element 1 of the present embodiment, in the case 10, the positive electrode uncoated laminated portion 56 of the electrode body 5 and the negative electrode uncoated laminated portion 56 are respectively disposed.

  The current collector 12 of the positive electrode and the current collector 12 of the negative electrode are formed of different materials. Specifically, the current collector 12 of the positive electrode is formed of, for example, aluminum or an aluminum alloy, and the current collector 12 of the negative electrode is formed of, for example, copper or a copper alloy.

  The storage element 1 includes an insulating member 14 and the like that insulate the electrode body 5 from the case 10. The insulating member 14 of the present embodiment is, for example, an insulating cover. The insulating member 14 is disposed between the case 10 (specifically, the case body 100) and the electrode assembly 5 (see FIG. 4). The insulating member 14 is formed of a sheet-like member having an insulating property. The insulating member 14 of the present embodiment is formed of, for example, a resin such as polypropylene or polyphenylene sulfide. The insulating member 14 of the present embodiment is formed into a bag shape by bending a sheet-like member having insulation that is cut into a predetermined shape. In the storage element 1 of the present embodiment, the electrode body 5 (specifically, the electrode body 5 and the current collector 12) housed in the bag-shaped insulating member 14 is housed in the case 10.

  Spacer 2 has insulation and is adjacent to storage element 1 in the X-axis direction as shown in FIGS. 1 and 6. The spacer 2 has a base adjacent to the storage element 1 (more specifically, the case 10, more specifically, the long wall portion 100c of the body 100b), and a restriction portion for preventing positional deviation of the storage element 1 adjacent to the base. Have.

  The spacer 2 will be described more specifically. The power storage device includes two types of spacers 2 (2A, 2B). Specifically, the power storage device includes an internal spacer 2A disposed between two power storage elements 1 and an external spacer 2B adjacent to the power storage element 1 at the end of the plurality of power storage elements 1.

  The internal spacer 2A moves in the Y-axis and Z-axis directions with respect to the base 20A of the storage element 1 adjacent to the base 20A adjacent to the storage element 1 (specifically, the long wall portion 100c of the case main body 100) and the base 20A And a regulating unit 21A for regulating positional deviation).

  The base 20A of the internal spacer 2A is sandwiched between two adjacent storage elements 1. That is, the storage elements 1 are disposed on both sides of the base 20A of the internal spacer 2A in the X-axis direction. The base 20A extends along the storage element 1 (specifically, the long wall portion 100c) adjacent to the base 20A in the X-axis direction. The base 20A of the present embodiment extends in a direction (Y-Z plane (plane including Y-axis and Z-axis) direction) orthogonal to the X-axis direction. The base 20A has a size corresponding to the long wall portion 100c of the storage element 1.

  The base 20A of the internal spacer 2A of the present embodiment forms an air passage 203 between the base 20A and the storage element 1 for passing a cooling fluid (fluid for cooling).

  The restricting portion 21A suppresses (restricts) the positional deviation in the YZ plane direction with respect to the internal spacer 2A (base 20A) of the storage element 1 located on both sides in the X axis direction. Thus, the restricting portion 21A can restrict the relative movement of the two storage elements 1 adjacent to the internal spacer 2A in the Y-Z plane direction. Specifically, the restricting portions 21A extend from the base 20 to both sides in the X-axis direction. When the restriction portion 21A holds (restrains) the four corners of the storage element 1, positional deviation in the YZ plane direction with respect to the internal spacer 2A (base 20A) of the storage element 1 is restricted.

  As described above, the power storage device of the present embodiment includes the plurality of power storage elements 1, and the internal spacer 2A is disposed between the adjacent power storage elements 1. Therefore, the power storage device of the present embodiment includes a plurality of internal spacers 2A.

  The external spacer 2B has a base 20B adjacent to the storage element 1 in the X-axis direction, and a restricting portion 21B for suppressing positional deviation of the storage element 1 adjacent to the base 20B with respect to the base 20B. The external spacer 2 </ b> B of the present embodiment forms a ventilation path 203 for allowing the cooling fluid to pass between it and the adjacent storage element 1.

  The base 20B of the outer spacer 2B extends along the storage element 1 (specifically, the long wall portion 100c) adjacent to the base 20B in the X-axis direction. The base 20B of the present embodiment extends in the YZ plane direction. The base 20B of the outer spacer 2B has substantially the same size as the long wall portion 100c of the storage element 1.

  The restricting portion 21B restricts positional deviation (relative movement) of the storage element 1 adjacent to the external spacer 2B with respect to the base 20B. The restricting portion 21B extends from the base 20B of the outer spacer 2B toward the storage element 1 adjacent to the base 20B. When the restriction portion 21B holds (restrains) the four corners of the storage element 1, positional deviation of the storage element 1 with respect to the external spacer 2B (base 20B) in the YZ plane direction is restricted.

  The external spacer 2B configured as described above is disposed between the storage element 1 and the holding member 3 in the X-axis direction. At this time, the external spacer 2B also forms an air passage 203 for allowing the cooling fluid to pass between it and the holding member 3 (specifically, the end member 30 described later).

  The power storage device of the present embodiment includes a pair of external spacers 2B. Each of the pair of external spacers 2B is adjacent to the storage element 1 at the end of the plurality of storage elements 1. That is, the pair of external spacers 2B are arranged so as to sandwich the plurality of aligned storage elements 1 in the X-axis direction.

  Holding member 3 clamps storage element 1 and spacer 2 in the X-axis direction (that is, the stacking direction of positive electrode 53, negative electrode 54 and separator 55 in flat part 57 of electrode body 5 (hereinafter simply referred to as “positive electrode 53 etc. Hold in the direction of stacking). Specifically, as shown in FIGS. 1 and 6, the holding member 3 includes a pair of end members 30 disposed on both sides of the plurality of storage elements 1 aligned in the X-axis direction, and the pair of end members 30. And a frame 31 connecting the two.

  Each of the pair of end members 30 extends along the storage element 1 (specifically, the long wall portion 100c). The end member 30 of the present embodiment extends in the Y-Z plane direction. Each end member 30 faces the outer spacer 2B. The termination member 30 of the present embodiment has a substantially rectangular shape (a shape corresponding to the storage element 1) as viewed in the X-axis direction.

  The frame 31 has connection parts 310 and 311 which connect the pair of end members 30 to each other. Specifically, a plurality of (two in the example of the present embodiment) connection portions 310 and 311 of the frame 31 extend along the corners of the plurality of storage elements 1 aligned in the X-axis direction via the internal spacer 2A. Have. The holding member 3 of the present embodiment has a frame 31 at one end and the other end in the Y-axis direction. Each of the pair of frames 31 is a first connection portion 310 disposed at a position corresponding to the cover plate 101 of the storage element 1 and a second connection portion 311 disposed at a position corresponding to the closed portion 100 a of the storage element 1. And. The first connection portion 310 extends in the X-axis direction. Similarly to the first connection portion 310, the second connection portion 311 also extends in the X-axis direction. In addition, the frame 31 has a support portion 312 that connects the first connection portion 310 and the second connection portion 311. The support portion 312 connects corresponding end portions of a pair of connection portions (a first connection portion 310 and a second connection portion 311) on the same side with respect to the storage element 1 in the Y-axis direction. In addition, the frame 31 includes a reinforcing portion 314 that connects intermediate portions of the first connection portion 310 and the second connection portion 311 adjacent to each other in the Z-axis direction.

  Both end portions in the X-axis direction of the frame 31 configured as described above (specifically, both end portions of the first connection portion 310 and the second connection portion 311) are fixed to the pair of end members 30. At this time, when the frame 31 is connected to the pair of end members 30, the first connection portion 310 and the second connection portion 311 have the plurality of storage elements 1 aligned in the X-axis direction in the same direction. It is set to such a length as to be tightened. Therefore, each end member 30 presses the outer spacer 2B in the X-axis direction. Thus, in each of the storage elements 1 arranged in the X-axis direction, a force toward the internal space 13 is applied to each of the pair of long wall portions 100c. At this time, as described above, the electrode body 5 is housed (arranged) in the case 10 so that the flat portion 57 is sandwiched between the pair of long wall portions 100c in the stacking direction of the positive electrode 53 and the like in the flat portion 57. . For this reason, the flat portion 57 is in a state in which a force in the stacking direction of the positive electrode 53 and the like (in the example of the present embodiment, the X-axis direction) is applied.

  Also, the frame 31 is made of metal as described above, and shrinks slightly by being cooled.

  The insulator 4 is made of an insulating material, and insulates between the storage element 1 and the holding member 3. The power storage device of the present embodiment includes a pair of insulators 4 as shown in FIGS. 1 and 6. Each of the pair of insulators 4 is connected to the first insulating portion 40 disposed between the first connection portion 310 and the spacer 2 (the restricting portion 21A of the inner spacer 2A and the restricting portion 21B of the outer spacer 2B) A second insulating portion 41 is disposed between the portion 311 and the spacer 2 (the restricting portion 21A of the inner spacer 2A and the restricting portion 21B of the outer spacer 2B). The insulator 4 is a third insulating portion connecting the first insulating portion 40 and the second insulating portion 41, and is a third insulating portion disposed between the external spacer 2 B and the support portion 312 of the frame 31. It has a section 42. Furthermore, the insulator 4 is the fourth insulating portion 43 connecting the middle position of the first insulating portion 40 and the middle position of the second insulating portion 41, and between the storage element 1 and the reinforcing portion 314 of the frame 31. It has the 4th insulation part 43 arrange | positioned.

  Next, a method of manufacturing the power storage device will be described with reference to FIGS.

  With the electrode body 5 around which the positive electrode 53, the negative electrode 54, and the separator 55 are wound is disposed in the case main body 100, the opening of the case main body 100 is closed (sealed) by the cover plate 101. At this time, the external terminal 11, the current collector 12, the insulating member 14 and the like are also arranged or assembled at predetermined positions. Thus, the storage element 1 is formed (step S1).

  Next, the plurality of storage devices 1 and the plurality of spacers 2 are alternately arranged in the X-axis direction, and the plurality of storage devices 1 and the plurality of spacers 2 in the aligned state are collectively held by the holding member 3. Thus, the assembly process of the power storage device is completed (step S2).

  When the assembly process of the storage device is completed, the storage device is inspected. In this inspection, a metal (for example, metal powder generated when cutting the positive electrode 53, the negative electrode 54, etc., etc., which are mixed in the electrode body 5 at the time of assembling the storage element 1 etc.) It is checked whether or not the metal such as wear debris is present, and whether these metals are deposited on the negative electrode 54 (step S3). Specifically, it is as follows.

  First, as shown in FIG. 8, the power storage device is disposed in a test chamber 70 or the like capable of controlling the ambient temperature, such as a thermostat, and the power storage device is configured to measure the electrical characteristics of each power storage element 1. A conducting wire or the like is connected to the external terminal 11 of each storage element 1 (step S31). At this time, each storage element 1 of the storage device is in a charged state. Here, the electrical characteristic is not limited as long as it is a characteristic that is electrically measured in the storage element 1, and examples include voltage and electrical resistance. In the present embodiment, the voltage is measured.

  Subsequently, the temperature of the test room 70 is lowered to cool the power storage device (step S32). When the temperature of the test chamber 70 drops to a predetermined temperature (in the example of the present embodiment, a predetermined temperature of 10 ° C. or less), this temperature is maintained until the end of the inspection.

  When the storage device is sufficiently cooled to about the temperature of the test room 70 and the temperature of the storage device is stabilized, the voltage (first voltage) of each storage element 1 is measured (step S33), and each storage element measured Record the first voltage of 1. In the inspection method of the present embodiment, the first voltage of each storage element 1 is recorded in the recording unit (hard disk, memory, etc.) 72 of the inspection device 71 etc. to which the conducting wire is connected.

  Next, after a predetermined period (a predetermined period of 0.8 days or more and 3 days or less in the example of this embodiment) elapses after the first voltage is measured, the voltage of each storage element 1 (second Voltage) is measured (step S34). The temperature of the test chamber 70 is maintained at the predetermined temperature at least from the measurement of the first voltage to the measurement of the second voltage.

  When the second voltage of each storage element 1 is measured, the inspection device 71 or the like extracts a first voltage corresponding to the measured second voltage from the recording unit, and outputs the first voltage and the first voltage. From the second voltage (ie, from the first voltage and the second voltage measured from the same storage element 1), a short circuit occurs in the storage element 1 at which the first and second voltages are measured. It is determined whether or not it is present (step S35). The inspection apparatus 71 or the like according to the present embodiment determines the voltage drop in the storage element 1 from when the first voltage is measured to when the second voltage is measured, and this voltage drop is determined based on a predetermined value (threshold). When it is large, it is determined that a short circuit has occurred in the storage element 1.

  The short circuit is caused by the metal deposited on the negative electrode 54. Specifically, it is as follows. It is assumed that metal impurities (hereinafter, also simply referred to as “metal”) such as metal wear debris of manufacturing equipment of storage element 1 are mixed in the inside of electrode body 5 (specifically, in the vicinity of positive electrode 53) When the storage element 1 provided with the electrode assembly 5 is charged, part of the impurities is dissolved by the potential of the positive electrode 53. Then, the dissolved metal diffuses in the electrolytic solution to reach the negative electrode 54, and is deposited by the potential of the negative electrode 54. Thus, a metal (metal powder, metal wear debris, etc.) mixed between the positive electrode 53 and the negative electrode 54 and a metal deposited on the negative electrode 54 penetrate the separator 55 to conduct the positive electrode 53 and the negative electrode 54. Cause a slight short circuit.

  The storage element 1 determined to have a slight short circuit in the above-described storage device inspection is replaced, whereby the storage device is completed.

  According to the above storage device testing method, in storage device 1 of the storage device, holding member 3 holds electrode assembly 5 (specifically, flat portion 57) via case 10 in the X axis direction (flat portion 57). The force in the stacking direction of the positive electrode 53 or the like is applied. Therefore, in the electrode body 5, the positive electrode 53 and the negative electrode 54 come close to each other, whereby a metal present between the positive electrode 53 and the negative electrode 54 or a metal deposited in the negative electrode 54 (in the state where the force is not applied) When there is a metal to the extent that the positive electrode 53 and the negative electrode 54 do not conduct) or the like comes into contact with the positive electrode 53 (that is, a short circuit occurs), the first voltage and the second From the voltage and the minute short circuit caused by the metal can be detected with high accuracy. That is, by applying a force in the stacking direction of the positive electrode 53 or the like to the electrode assembly 5 of the storage element 1 constituting the storage device, a slight amount of metal or negative electrode 54 between the positive electrode 53 and the negative electrode 54 in the electrode assembly 5 is applied. It is possible to cause a slight short circuit due to the metal deposited on the first and second voltages. As a result, the metal between the positive electrode 53 and the negative electrode 54 of the storage element 1, the metal deposited on the negative electrode 54, and the like can be detected with high accuracy.

  In the method of testing the storage device of the present embodiment, the plurality of storage devices 1 aligned in the X-axis direction are tightened by the holding member 3, whereby the cases 10 of the respective storage devices 1 (more specifically, the electrode body through the case 10) A force directed inward in the stacking direction of the electrode assembly 5 is applied to the flat portion 57). Therefore, in each of the plurality of power storage devices 1 configuring the power storage device, the metal between the positive electrode 53 and the negative electrode 54 and the metal deposited on the negative electrode 54 can be detected with high accuracy.

  Moreover, in the inspection method of the storage device of the present embodiment, the holding member 3 applies a force in the X axis direction (the stacking direction of the positive electrode 53 and the like in the flat portion 57) to the electrode body 5 (flat portion 57). By using the clamping force of the holding member 3, the force can be applied to the electrode body 5 without using a clamping device (clamping device) or the like separate from the power storage device. This makes it possible to accurately detect the metal between the positive electrode 53 and the negative electrode 54, the metal deposited on the negative electrode 54, and the like.

  Further, in the method of inspecting the power storage device of the present embodiment, since the entire power storage device is cooled, the power storage element 1 constituting the power storage device is cooled and the pressure in the case 10 is reduced. Therefore, a force in the X-axis direction (the stacking direction of the positive electrode 53 and the like in the flat portion 57) through the case 10 is efficiently applied to the electrode assembly 5. In addition, since the metal connection portions 310 and 311 contract due to cooling, a force in the X axis direction (the stacking direction) caused by the contraction of the connection portions 310 and 311 is also applied to the electrode assembly 5 from the pair of end members 30. . Thereby, a larger force in the X-axis direction (the stacking direction) is applied to the electrode assembly 5. That is, by utilizing the tightening force caused by the contraction of the connection portions 310 and 311 generated by the cooling of the holding member 3, a larger force in the X axis direction (the stacking direction) can be applied to the electrode body 5. Therefore, in the storage element 1 (electrode assembly 5), when there is a slight amount of metal between the positive electrode 53 and the negative electrode 54, or when a slight amount of metal is deposited on the negative electrode 54, A short circuit can be generated, and as a result, the metal can be detected more accurately.

  Further, in the method of manufacturing the power storage device of the present embodiment, since the above-described inspection (detection of the metal deposited on the negative electrode 54) is performed after the process of assembling the power storage device, When metal is present between the positive electrode 53 and the negative electrode 54 in the body 5 or when metal is deposited on the negative electrode 54, these metals can be detected with high accuracy. Therefore, it is possible to prevent the use of the power storage device including the power storage element 1 in a state in which a metal is present between the positive electrode 53 and the negative electrode 54 or in a state in which the metal is deposited on the negative electrode 54.

  Next, a second embodiment of the present invention will be described with reference to FIGS. Specifically, in the present embodiment, a method of inspecting the storage element 1 and a method of manufacturing the storage element 1 using the inspection method will be described. The storage element 1 to be inspected in the present embodiment has the same configuration as the storage element 1 in the first embodiment.

  First, the storage element 1 is disposed in a test chamber or the like capable of controlling the ambient temperature, such as a thermostat, and a lead wire or the like is connected to the external terminal 11 of the storage element 1 so as to measure the voltage (step S11). At this time, the storage element 1 is in a charged state. In addition, as shown in FIG. 12, the storage element 1 is disposed in a test chamber or the like in a state of being clamped in the X-axis direction (the stacking direction of the positive electrode 53 etc. in the flat portion 57) by a clamping (clamping) device 80. (Step S12). The order of steps S11 and S12 may be reversed, or may be performed simultaneously.

  Here, according to the holding device 80, a force in the X-axis direction (the stacking direction of the positive electrode 53 and the like in the flat portion 57) can be continuously applied to the storage element 1. That is, the holding device 80 can keep holding the storage element 1 in the X-axis direction. The sandwiching device 80 includes a pair of sandwiching members 81 disposed on both sides of the case 10 in the X-axis direction (the stacking direction of the positive electrode 53 and the like in the flat portion 57) when the storage element 1 is disposed; And a metal connection portion 82 extending directly and indirectly connecting the pair of holding members 81 with each other. The holding device 80 also includes a distance adjusting mechanism 84 that adjusts the distance between the pair of holding members 81 by rotating the rotation operation unit 83.

  Step S12 and subsequent steps are the same as the method of inspecting the power storage device in the first embodiment. Specifically, it is as follows.

  The test chamber is lowered to a predetermined temperature (in the example of the present embodiment, a predetermined temperature of 10 ° C. or less) to cool the storage element 1 (step S13). After the storage element 1 is sufficiently cooled, the voltage (first voltage) of the storage element 1 is measured (step S14), and a predetermined period (0 in the example of the present embodiment) after the first voltage is measured. After a lapse of a predetermined period of not less than 8 days and not more than 3 days, the voltage (second voltage) of the storage element 1 is measured (step S15). From the first voltage and the second voltage, it is determined whether or not a short circuit has occurred in the storage element 1 (step S16). In the storage element inspection method according to the present embodiment, as in the storage device inspection method according to the first embodiment, in the storage element 1 from when the first voltage is measured to when the second voltage is measured. When the voltage drop is larger than a predetermined value (threshold value), it is determined that a short circuit has occurred in the storage element 1.

  The inspection method of the storage element 1 described above is used, for example, in a method of manufacturing the storage element 1 as described below.

  With the electrode body 5 around which the positive electrode 53, the negative electrode 54, and the separator 55 are wound is disposed in the case main body 100, the opening of the case main body 100 is closed (sealed) by the cover plate 101. At this time, the external terminal 11, the current collector 12, the insulating member 14 and the like are also arranged or assembled at predetermined positions. Thereby, the storage element 1 is formed (step S21).

  When the process of assembling the storage element 1 is completed, the above-described inspection of the storage element 1, that is, whether metal is mixed in the electrode body 5 at the time of assembly of the storage element 1, etc. It is checked whether or not it is present (step S22). The storage element 1 determined to have a slight short circuit in this inspection is not shipped as a defective product. On the other hand, the storage element 1 which is determined in the inspection that no short circuit has occurred is shipped as a finished product.

  According to the above-described inspection method of storage element 1, the force in the X-axis direction (the stacking direction of positive electrode 53 and the like in flat portion 57) is applied to electrode body 5 (specifically, flat portion 57) through case 10 by sandwiching device 80. When the positive electrode 53 and the negative electrode 54 approach each other and a metal is present between the positive electrode 53 and the negative electrode 54 or when a metal is deposited on the negative electrode 54 (in the state where the force is not applied, The positive electrode 53 and the negative electrode 54 are electrically connected (that is, a short circuit occurs) when there is a metal that does not electrically connect the negative electrode 54. The metal can be accurately detected from the first voltage and the second voltage measured at predetermined intervals in the slightly shorted state. That is, by applying a force in the X-axis direction (the stacking direction) to the electrode body 5, a fine metal caused by a slight metal between the positive electrode 53 and the negative electrode 54 or a metal slightly deposited in the negative electrode 54 By causing a short circuit in the electrode assembly 5 and detecting this slight short circuit from the first voltage and the second voltage, the metal deposited on the negative electrode 54 can be detected with high accuracy.

  In the method of inspecting the storage element 1 of the present embodiment, since the storage element 1 is cooled between the measurement of the first voltage and the measurement of the second voltage, the pressure in the case 10 is reduced. For this reason, the force in the X-axis direction (the stacking direction of the positive electrode 53 and the like in the flat portion 57) by the sandwiching device 80 via the case 10 is efficiently applied to the electrode body 5, thereby providing a space between the positive electrode 53 and the negative electrode 54. A slight short circuit due to a slight amount of metal or a slight amount of metal deposited on the negative electrode 54 can be generated. As a result, the metal deposited on the negative electrode 54 can be detected more accurately.

  Further, in the method of inspecting the storage element 1 of the present embodiment, the storage device 1 as well as the holding device 80 that includes the metal connection portion 82 and that clamps (holds) the storage element 1 is also cooled. Therefore, the metal connection portion 82 is shrunk by cooling, and a force in the X-axis direction (the stacking direction) caused by the contraction of the connection portion 82 is applied to the electrode assembly 5 from the pair of holding members 81. Thereby, a larger force in the X-axis direction (the stacking direction) is applied to the electrode assembly 5. Therefore, in the storage element 1 (electrode assembly 5), a slight short circuit caused by a smaller amount of metal between the positive electrode 53 and the negative electrode 54 or a smaller amount of metal deposited in the negative electrode 54 can be generated. As a result, the metal deposited on the negative electrode 54 can be detected more accurately.

  Further, in the method of manufacturing the storage element 1 of the present embodiment, after the assembly step of the storage element 1, the above-described inspection (detection of metal deposited on the negative electrode 54) is performed. A smaller amount of metal between the positive electrode 53 and the negative electrode 54 and a metal deposited on the negative electrode 54 can be detected with high accuracy. For this reason, it is possible to prevent the use of the storage element 1 in a state in which a metal is present between the positive electrode 53 and the negative electrode 54 or in a state in which a metal is deposited on the negative electrode 54.

  The method of testing the storage element 1 of the present invention, the method of testing the storage device including the storage element 1, the method of manufacturing the storage element 1, and the method of fabricating the storage device including the storage element 1 are the first and second embodiments. Of course, various changes can be made without departing from the scope of the present invention. For example, the configuration of one embodiment can be added to the configuration of another embodiment, and part of the configuration of one embodiment can be replaced with the configuration of another embodiment. In addition, some of the configuration of an embodiment can be deleted.

  In the inspection method of the storage device of the first embodiment and the inspection method of the storage element 1 of the second embodiment (hereinafter simply referred to as “the inspection method of the first and second embodiments”), at least the first Although the storage device or storage element 1 is in a cooled state from the measurement of the voltage to the measurement of the second voltage, the present invention is not limited to this configuration. The power storage device or the power storage element may not be cooled between the measurement of the first voltage and the measurement of the second voltage. Even with this configuration, a force is applied to the electrode body 5 (flat portion 57) from both sides in the X-axis direction (the stacking direction of the positive electrode 53 and the like in the flat portion 57). ) The metal and the metal deposited on the negative electrode 54 can be detected with high accuracy.

  In addition, cooling of the power storage device or the like may be performed only during a part of the period from the measurement of the first voltage to the measurement of the second voltage. Even with this configuration, the pressure in the case decreases while cooling. For this reason, the metal which has deposited only to such an extent that a slight short circuit does not occur only by the force applied to the electrode body 5 in the stacking direction of the positive electrode 53 etc. can be minutely short circuited (while cooling) Thus, the metal can be detected because a larger voltage drop can be detected than in the case of normal discharge only.

  In the inspection methods of the first and second embodiments, the power storage device and the like are cooled to a predetermined temperature of 10 ° C. or less, but the present invention is not limited to this configuration. It may be cooled to a temperature lower than the temperature of the internal space 13 of the case 10 when the storage device or the like is stored or the like before the inspection. As a result, the pressure inside the case 10 can be reduced, and external force can be easily transmitted to the electrode body 5 through the case 10.

  In the method of testing the storage device of the first embodiment, the metal in the negative electrode 54 and the metal having a smaller amount than the ones (mixed) between the positive electrode 53 and the negative electrode 54 are obtained only by the clamping force in the X axis direction by the holding member 3. Although the metal deposited on the positive electrode 53 is brought into contact with the positive electrode 53 and the negative electrode 54 (slightly shorted), the present invention is not limited to this configuration. The storage device may be further tightened in the X-axis direction by a clamping (clamping) device 80 or the like.

  The inspection object of the inspection methods of the first and second embodiments is the so-called wound type storage element 1 in which the positive electrode 53 and the like are wound, but the substantially rectangular positive electrode 53, the negative electrode 54 and the separator 55 are stacked It may be a so-called stacked type storage element.

  In the first and second embodiments, although the storage element and the storage device are inspected based on the first voltage and the second voltage, the present invention is not limited to this. That is, for example, a reference value of the electrical characteristic measured in the storage element and the storage device may be set, and the inspection may be performed based on the reference value. Specifically, for example, the resistance value of the storage element may be measured, and when the resistance value is larger than the reference value, it may be determined that a slight short circuit has occurred.

  DESCRIPTION OF SYMBOLS 1 ... Storage element, 10 ... Case, 100 ... Case main body, 100a ... Blocking part, 100b ... Body part, 100c ... Long wall part, 100d ... Short wall part, 101 ... Lid board, 102 ... Opening peripheral part, 11 ... External terminal , 110: surface, 12: current collector, 13: internal space, 14: insulating member, 2: spacer, 2A: internal spacer, 2B: external spacer, 20, 20A, 20B: base, 203: ventilation path, 21A, 21B: Regulating part, 3: Holding member, 30: Terminating member, 31: Frame, 310: First connection part (connection part), 311: Second connection part (connection part), 312: Support part, 314: Reinforcement part , 4: insulator, 40: first insulating part, 41: second insulating part, 42: third insulating part, 43: fourth insulating part, 5: electrode body, 51: winding core, 52: laminate, 53 ... Positive electrode, 54 ... negative electrode, 531, 541 ... uncoated portion 532, 542: coated portion, 55: separator, 56: uncoated laminated portion, positive electrode uncoated laminated portion, negative electrode uncoated laminated portion, 57: flat portion, 58: curved portion, 70: test chamber, 71: inspection device, DESCRIPTION OF SYMBOLS 80 ... clamping apparatus, 81 ... clamping member, 82 ... connection part, 83 ... rotation operation part, 84 ... space | interval adjustment mechanism

Claims (7)

An electrode assembly including a separator and a positive electrode and a negative electrode alternately stacked via the separator, and a case of a storage element having a case for housing the electrode assembly, the positive electrode and the negative electrode from the outside of the case Applying a force in the stacking direction,
Cooling the storage element;
And a measuring twice the electrical characteristics at a predetermined time before Symbol storage element,
And that the cooling and the addition of the force, at least, between the measurement start the electrical characteristics of the first time until the end of measurement of the second time in the electrical characteristics, that is maintained, the inspection method of the storage element. When the force is applied, the force is provided by a pair of holding members disposed on both sides of the case in the stacking direction, and a metal connection portion extending in the stacking direction and connecting the pair of holding members. Add to the case,
The method of testing a storage element according to claim 1, wherein the pair of holding members and the connection portion are cooled together with the storage element in the cooling. An electric storage device comprising: an electrode body including a separator and a positive electrode and a negative electrode alternately stacked via the separator; and at least one electric storage element having a case for housing the electrode body. Applying a force in the stacking direction of the positive electrode and the negative electrode from the outside of the case;
Cooling the storage element;
And a measuring twice the electrical characteristics at a predetermined time before Symbol storage element,
And that the cooling and the addition of the force, at least, between the measurement start the electrical characteristics of the first time until the end of measurement of the second time in the electrical characteristics, that is maintained, the inspection method of a power storage device. The power storage device includes a plurality of the power storage elements.
When applying the force, a force is applied to the respective cases of the plurality of storage elements from the outside of the case in the stacking direction of the positive electrode and the negative electrode,
The storage device testing method according to claim 3, wherein in the measurement of the electrical characteristics, the electrical characteristics of each of the plurality of storage devices are measured. The power storage device is a holding member for holding the power storage element, and connects the pair of end members disposed on both sides of the power storage element in the stacking direction and the pair of end members extending in the stacking direction A holding member having a metallic connection portion,
The holding member applies the force to the storage element;
The method of testing a storage device according to claim 4, wherein the holding member is cooled together with the storage element in the cooling. An electrode assembly including a separator and a positive electrode and a negative electrode alternately stacked via the separator is housed in a case to form a storage element;
A method for manufacturing a storage element, comprising performing the method for testing a storage element according to claim 1 after forming the storage element. Forming a storage element by housing an electrode body including a separator and a positive electrode and a negative electrode stacked alternately via the separator in a case;
A method of manufacturing a power storage device, comprising: performing the method of testing a power storage device according to any one of claims 3 to 5 after formation of the power storage element.