Power storage element box, testing device and evaluation method

Abstract

To provide a power storage element box, a testing device and an evaluation method, capable of preventing an effect from a defective power storage element on other power storage elements in a performance test for the power storage elements in a thermostatic chamber.SOLUTION: A power storage element is arranged while being stored in a power storage element box 20 within a thermostatic chamber, and is subjected to a performance test. The power storage element box includes a box main body 30 for storing the power storage element, and electrical wiring extending in the box main body and connecting with a tab of the power storage element. The box main body contains an insulating and nonflammable material.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a box for a power storage element, a test device, and an evaluation method.

Background Art

[0002] For example, as proposed in Patent Document 1, a power storage element formed by laminating a positive electrode and a negative electrode is known as a secondary battery. Power storage elements are widely used in various applications such as in-vehicle use and stationary housing use.

[0003] The performance of a power storage element is evaluated by a performance test carried out before actual use. In one example of a performance test, charging and discharging of the power storage element to be evaluated are repeated over a long period (for example, several months). The performance test is carried out in a thermostatic chamber, and the performance is evaluated under environmental conditions simulating the usage environment of the power storage element.

[0004] A plurality of power storage elements whose performance is evaluated under the same conditions are arranged in the thermostatic chamber. By evaluating the performance of a plurality of power storage elements, the reliability of the evaluation results can be improved.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] Problems may occur inside the thermostatic chamber where the performance test of the energy storage element is being conducted. For example, a short circuit may occur between two energy storage elements. In a performance test under severe conditions, it is even assumed that one of the energy storage elements may catch fire. And the problems occurring inside the thermostatic chamber may also affect other energy storage elements under test that are unrelated to the cause of the problems. That is, due to one problem, it becomes impossible to accurately evaluate the performance of a plurality of energy storage elements arranged inside the thermostatic chamber. Furthermore, it may be necessary to re-perform the performance test that requires a long time on a large number of energy storage elements. In order to re-perform the performance test over a long period, the evaluation results are obtained significantly later than the originally scheduled date.

[0007] The present invention has been made in consideration of the above points, and an object thereof is to accurately and stably evaluate the performance of a plurality of energy storage elements by a test inside a thermostatic chamber.

Means for Solving the Problems

[0008] The first energy storage element box according to an embodiment of the present invention is an energy storage element box arranged inside a thermostatic chamber where a performance test of the energy storage element is carried out, including a box body that contains a material having insulating and flame-retardant properties and houses the energy storage element, and an electrical wiring that extends inside the box body and is electrically connected to the energy storage element.

[0009] The second energy storage element box according to an embodiment of the present invention is an energy storage element box arranged inside a thermostatic chamber where a performance test of the energy storage element is carried out, including a box body that includes a wall portion partitioning an accommodation chamber for housing the energy storage element, and an electrical wiring that extends inside the box body and is electrically connected to the energy storage element, wherein a through hole is provided in the wall portion.

[0010] The first test device according to an embodiment of the present invention is a test device for carrying out a performance test of an energy storage element, including a thermostatic chamber, A plurality of boxes for storage elements disposed within the constant temperature bath, and each box for a storage element is capable of housing the storage element.

[0011] A second test apparatus according to an embodiment of the present invention is a test apparatus for performing a performance test on a storage element, and includes a constant temperature bath, and a plurality of boxes for storage elements disposed within the constant temperature bath, and each box for a storage element is a first or second box for a storage element according to an embodiment of the present invention.

[0012] A first evaluation method according to an embodiment of the present invention is an evaluation method for evaluating the performance of a storage element, and includes a step of disposing a plurality of boxes for storage elements, each housing the storage element, within a constant temperature bath, and a step of performing a test on the storage element within the constant temperature layer.

[0013] A second evaluation method according to an embodiment of the present invention is an evaluation method for evaluating the performance of a storage element, and includes a step of disposing a plurality of boxes for storage elements, each housing the storage element, within a constant temperature bath, and a step of performing a test on the storage element within the constant temperature layer, and each box for a storage element is a first or second box for a storage element according to an embodiment of the present invention.

Advantages of the Invention

[0014] According to the present invention, the performance of a plurality of storage elements can be accurately and stably evaluated by a test within a constant temperature bath.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

DETAILED DESCRIPTION OF THE INVENTION

[0016] One embodiment of the present disclosure relates to the following <1> to <19>.

[0017] <1> A box for a power storage element disposed in a thermostatic chamber in which a performance test of the power storage element is carried out, including a box body that contains the power storage element and is made of a material having insulation and flame retardancy, and an electrical wiring that extends inside the box body and is electrically connected to the power storage element. The box for a power storage element is provided.

[0018] <2> The box body includes a wall portion that defines a storage chamber for storing the power storage element, and the wall portion has insulation and flame retardancy. The box for a power storage element according to <1>.

[0019] <3> The box body includes a wall portion that defines a storage chamber for storing the power storage element, and the thickness of the wall portion is 0.5 mm or more. The box for a power storage element according to <1> or <2>.

[0020] <4> The glass transition temperature of the above-mentioned material is 100 °C or higher, and the box for a power storage element according to any one of <1> to <3>.

[0021] <5> The box body includes a wall portion that partitions a storage chamber for housing the power storage element. The box for a power storage element according to any one of <1> to <4>, wherein a through hole is provided in the wall portion.

[0022] <6> A box for a power storage element disposed in a thermostat in which a performance test of the power storage element is carried out, comprising a box body including a wall portion that partitions a storage chamber for housing the power storage element, and an electrical wiring that extends inside the box body and is electrically connected to the power storage element. The box for a power storage element, wherein a through hole is provided in the wall portion.

[0023] <7> The box for a power storage element according to <5> or <6>, wherein the opening ratio of the through hole is 10% or more.

[0024] <8> The box for a power storage element according to any one of <5> to <7>, wherein the through hole includes two or more through holes that are spaced apart from each other.

[0025] <9> The wall portion includes two plate portions that face each other with the storage chamber therebetween. The box for a power storage element according to any one of <5> to <8>, wherein the through hole includes through holes provided in each of the two plate portions.

[0026] <10> The wall portion includes two plate portions that face each other with the storage chamber therebetween. The box for a power storage element according to any one of <5> to <9>, wherein the through hole includes through holes provided in each of the two plate portions and facing each other.

[0027] <11> The wall portion includes a plurality of plate portions facing each other with the accommodation chamber therebetween. The through hole includes through holes provided in each of the plurality of plate portions, and is the box for a power storage element according to any one of <5> to <10>.

[0028] <12> The box for a power storage element according to any one of <5> to <11>, wherein the power storage element accommodated in the box body can be observed from outside the box body through the through hole.

[0029] <13> The power storage element includes an electrode body, an exterior member that houses the electrode body, and a tab that is electrically connected to the electrode body and extends from the exterior member. The electrical wiring includes two electrical wirings connected to different tabs of the power storage element, and is the box for a power storage element according to any one of <1> to <12>.

[0030] <14> The power storage element includes an electrode body, an exterior member that houses the electrode body, and a tab that is electrically connected to the electrode body and extends from the exterior member. The power storage element further includes a terminal block to which the electrical wiring and the tab of the power storage element are fixed. The terminal block is attached to the box body, and is the box for a power storage element according to any one of <1> to <13>.

[0031] <15> The power storage element includes an electrode body and an exterior member that houses the electrode body. The maximum value of the distance between the exterior member of the power storage element accommodated in the box body and the box body is 10% or less of the length of the long side of the exterior member, and is the box for a power storage element according to any one of <1> to <14>.

[0032] <16> A test apparatus for performing a performance test of a power storage element, a thermostatic chamber, and a plurality of boxes for power storage elements disposed in the thermostatic chamber. A test device in which each box for a storage element can accommodate the storage element.

[0033] <17> A test device for performing a performance test of a storage element, a thermostatic bath, and a plurality of boxes for storage elements arranged in the thermostatic bath, wherein each box for a storage element is the box for a storage element described in any one of <1> to <15>. A test device.

[0034] <18> An evaluation method for evaluating the performance of a storage element, comprising the steps of arranging a plurality of boxes for storage elements, each containing the storage element, in a thermostatic bath, and performing a test on the storage element in the thermostatic layer. An evaluation method.

[0035] <19> An evaluation method for evaluating the performance of a storage element, comprising the steps of arranging a plurality of boxes for storage elements, each containing the storage element, in a thermostatic bath, and performing a test on the storage element in the thermostatic layer, wherein each box for a storage element is the box for a storage element described in any one of <1> to <15>. An evaluation method.

[0036] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. In the drawings attached to this specification, for the sake of easy understanding, the scale, the aspect ratio of the vertical and horizontal dimensions, etc. are appropriately changed and exaggerated from those of the actual object. In some of the drawings, the configurations shown may be omitted in other drawings. The scale and the aspect ratio of the vertical and horizontal dimensions may be different between the drawings.

[0037] In this specification, terms specifying shapes, geometric conditions, and their degrees, such as terms like "parallel", "orthogonal", "identical", etc., and values of lengths and angles, etc., are not limited to strict meanings, but are interpreted to include ranges to the extent that similar functions can be expected.

[0038] To clarify the relationship of directions between the drawings, in some of the drawings, the common first direction D1, second direction D2, and third direction D3 are indicated by arrows with common reference numerals. The tip side of the arrow is the first side of each direction. The side opposite to the tip of the arrow is the second side of each direction. An arrow directed from the paper surface into the depth along the direction perpendicular to the paper surface of the drawing is indicated by a symbol with an "x" in a circle, as shown in FIG. 1 for example. An arrow directed from the paper surface toward the front along the direction perpendicular to the paper surface of the drawing is indicated by a symbol with a dot in a circle, as shown in FIG. 3 for example.

[0039] In the illustrated example, the first direction D1 and the second direction D2 are parallel to the horizontal direction. The first direction D1 and the second direction D2 are perpendicular to each other. The third direction D3 is parallel to the vertical direction.

[0040] In this specification, a plurality of candidates for upper limit values and a plurality of candidates for lower limit values regarding a numerical range may be described in a different sentence. In this description, the numerical range may be constituted by combining any one candidate for the upper limit value and any one candidate for the lower limit value. As an example, consider the description "Parameter B may be A1 or more, may be A2 or more, and may be A3 or more. Parameter B may be A4 or less, may be A5 or less, and may be A6 or less." In this example, the numerical range of parameter B may be A1 or more and A4 or less, may be A1 or more and A5 or less, may be A1 or more and A6 or less, may be A2 or more and A4 or less, may be A2 or more and A5 or less, may be A2 or more and A6 or less, may be A3 or more and A4 or less, may be A3 or more and A5 or less, and may be A3 or more and A6 or less.

[0041] FIGS. 1 to 7 are diagrams for explaining an embodiment. FIG. 1 is a front view showing a specific example of a test apparatus 5 in this embodiment. The test apparatus 5 includes a thermostatic chamber 10 and a plurality of boxes 20 for storage elements. The box 20 for storage elements houses a storage element 60. As shown in FIG. 1, a plurality of boxes 20 for storage elements can be arranged in the thermostatic chamber 10 simultaneously.

[0042] Inside each storage element box 20, a storage element 60 is accommodated. The storage element 60 is a secondary battery. The storage element 60 may be the minimum unit as a chargeable element. In actual use, the storage element 60 may be electrically connected directly or in parallel with other storage elements 60. The storage element 60 may form a storage element module together with other storage elements 60. The storage element 60 can adopt various types. The storage element 60 may be, for example, a lithium-ion secondary battery.

[0043] FIG. 7 shows a specific example of the storage element 60 that can be accommodated in the storage element box 20. The storage element 60 shown in FIG. 3 has a flat shape. As shown in FIG. 3, the storage element 60 may include an electrode body 62, an exterior member 64, and a tab 66. The electrode body 62 may include a positive electrode plate and a negative electrode plate. The electrode body 62 may include a plurality of positive electrode plates and a plurality of negative electrode plates stacked alternately. The exterior member 64 accommodates the electrode body 62. The exterior member 64 forms a sealed space for accommodating the electrode body 62. The tab 66 is electrically connected to the electrode body 62 and extends to the outside of the exterior member 64. The tab 66 functions as a terminal of the storage element 60.

[0044] However, the storage element 60 shown in FIG. 7 is only an example. The storage element 60 may have a configuration different from the configuration shown in FIG. 7. In the example shown in FIG. 7, the storage element 60 includes a pair of tabs 66 protruding on both sides in the first direction D1 which is the longitudinal direction, but is not limited to this example, and the storage element 60 may include a tab 66 extending in a direction other than the first direction D1. The storage element 60 may include a tab 66 protruding only on one side in any direction. Also, the storage element 60 may not include a tab 66 protruding from the exterior member 64. In this example, the electrical wiring 22 described later may be connected to the terminal portion of the electrode body 62. The terminal portion may be a part of the positive electrode plate or the negative electrode plate included in the electrode body 62.

[0045] The power storage element 60 is evaluated for performance prior to actual use. The test apparatus 5 is an apparatus for conducting tests for evaluating the performance of the power storage element 60. As an example, the power storage element 60 is evaluated for whether it has resistance to tests involving repeated charging and discharging over a long period. During the test, the thermostatic chamber 10 maintains the constant temperature chamber 12 that houses the power storage element box 20 at the test temperature. The test temperature may be the temperature of the usage environment of the power storage element 60 to be evaluated.

[0046] Each of the plurality of power storage element boxes 20 arranged in the thermostatic chamber 10 houses a power storage element 60. According to the test apparatus 5, the performance of a plurality of power storage elements 60 can be tested simultaneously. In the present embodiment, a device has been devised to accurately and stably evaluate the performance of a plurality of power storage elements 60 through a performance test using one thermostatic chamber 10.

[0047] Hereinafter, the thermostatic chamber 10 and the power storage element box 20 will be described in order.

[0048] The thermostatic chamber 10 has a constant temperature chamber 12 that houses the power storage element box 20. The thermostatic chamber 10 can maintain the temperature of the constant temperature chamber 12. The thermostatic chamber 10 can maintain the temperature of the constant temperature chamber 12 at a temperature other than room temperature. The thermostatic chamber 10 may be able to set the temperature of the constant temperature chamber 12 to an arbitrary temperature within a predetermined temperature range. The predetermined temperature is not particularly limited and may be selected according to the application of the power storage element 60 to be evaluated. As an example, the predetermined temperature may be -70°C or higher and 80°C or lower. When the internal temperature of the thermostatic chamber 10 can be changed, performance tests under different temperature conditions can be carried out with one test apparatus 5.

[0049] The number of power storage element boxes 20 that can be arranged simultaneously in the constant temperature chamber 12 of the thermostatic chamber 10 is not limited. In the example shown in FIG. 1, 12 power storage element boxes 20 can be arranged in the thermostatic chamber 10.

[0050] The configuration of the thermostat 10 is not particularly limited. The thermostat 10 may be various known ovens. In the example shown in FIG. 1, the thermostat 10 includes a partition wall 14 that partitions the constant temperature chamber 12. The partition wall 14 may include a door. The constant temperature chamber 12 may be opened by the door.

[0051] As shown in FIG. 1, the thermostat 10 may include a shelf 16 disposed in the constant temperature chamber 12. In the example shown in FIG. 1, the shelf 16 is held by the partition wall 14. The shelf 16 extends in a horizontal direction orthogonal to the third direction D3. Three shelves 16 are arranged at intervals in the third direction D3. By using the shelf 16, the number of boxes 20 for storage elements that can be arranged in the constant temperature chamber 12 can be increased.

[0052] As shown in FIG. 1, the thermostat 10 may include a pull-out mounting table 18. The mounting table 18 may be slidably provided on the shelf 16. The mounting table 18 may be movable only in the first direction D1 with respect to the partition wall 14 and the shelf 16. In the illustrated example, four mounting tables 18 are arranged on one shelf 16. The four mounting tables 18 are arranged in the second direction D2. One storage element box 20 can be placed on one mounting table 18. Different from the illustrated example, two storage element boxes 20 may be placed on one mounting table 18. By making the mounting table 18 pull-outable from the constant temperature chamber 12, the arrangement of the storage element box 20 into the constant temperature chamber 12 and the removal of the storage element box 20 from the constant temperature chamber 12 can be easily performed.

[0053] The storage element box 20 includes a box body 30 and electrical wiring 22. The box body 30 has a storage chamber 30a. The box body 30 can store the storage element 60 in the storage chamber 30a. The electrical wiring 22 extends in the storage chamber 30a. The electrical wiring 22 is electrically connected to the tab 66 of the storage element 60. The electrical wiring 22 may directly contact the tab 66 or may be electrically connected to the tab 66 via a conductive inclusion.

[0054] The box body 30 may contain a material having insulation and flame retardancy. The "material having insulation" means that the volume resistivity of the material is greater than 1.0×10 6 Ω·cm. Resin is exemplified as the material having insulation. The "material having flame retardancy" means a material that is evaluated as "V-2" or higher in the UL94 standard regarding flame retardancy established and approved by Underwriters Laboratories Inc. in the United States. The material having insulation and flame retardancy is not particularly limited.

[0055] Bakelite (registered trademark) is exemplified as the material having insulation and flame retardancy. Bakelite is a cured product of a thermosetting resin composition. Bakelite is a phenolic resin obtained by curing phenol and formaldehyde. Bakelite has excellent insulation and excellent flame retardancy.

[0056] Other materials having insulation and flame retardancy include thermoplastic resins such as liquid crystal polymer, polyether ether ketone, polyphenylene sulfide, polyphenylene ether, polyphenylene oxide, polyether imide, polyether sulfone, polyethylene naphthalate, polyethylene terephthalate, thermoplastic polyimide, or polymer alloys composed of them. Furthermore, cyanate resins such as polyimide, heat-resistant epoxy resin, bismaleimide triazine, thermosetting resins such as thermosetting modified polyphenylene ether, phenolic resin, etc. may be mentioned. What impregnates a base material such as paper, cotton cloth, glass cloth with resin varnish as a reinforcing agent may be used as the wall part having insulation and flame retardancy.

[0057] When the material is resin, a lower limit may be set for the glass transition temperature Tg (°C) of the material. By setting a lower limit for the glass transition temperature Tg (°C) of the material, as will be described later, it is possible to suppress the defects of the power storage element 60 generated in the constant temperature chamber 12 of the constant temperature bath 10 from affecting other power storage elements 60. The glass transition temperature Tg of the material may be 100°C or higher, 110°C or higher, 120°C or higher, or 140°C or higher. There is no particular upper limit set for the glass transition temperature Tg of the material. The glass transition temperature Tg of the material may be 200°C or lower.

[0058] The box body 30 may include a wall portion 35 that partitions the accommodation chamber 30a. The wall portion 35 may include a material having insulation and flame retardancy. The wall portion 35 may be composed of a material having insulation and flame retardancy.

[0059] A lower limit may be set for the thickness (mm) of the wall portion 35. By setting a lower limit for the thickness (mm) of the wall portion 35, as will be described later, it is possible to suppress the defects of the power storage element 60 generated in the constant temperature chamber 12 of the constant temperature bath 10 from affecting other power storage elements 60. The thickness of the wall portion 35 may be 0.5 mm or more, 1.0 mm or more, 2.0 mm or more, or 5.0 mm or more. There is no particular upper limit set for the thickness of the wall portion 35. The thickness of the wall portion 35 may be 20 mm or less or 10 mm or less.

[0060] As shown in FIGS. 2 to 6, the box body 30 may have a rectangular parallelepiped shape. In the illustrated example, the wall portion 35 includes a side plate portion 36, a bottom plate portion 37, and a top plate portion 38 as plate portions. One or more of the side plate portion 36, the bottom plate portion 37, and the top plate portion 38 may also be simply referred to as "plate portions". The bottom plate portion 37 and the top plate portion 38 face each other in the first direction D1. The side plate portion 36 connects the bottom plate portion 37 and the top plate portion 38. The side plate portion 36 is cylindrical with an axial direction along the third direction D3. The side plate portion 36 is a square cylinder. The side plate portion 36 includes four plate portions.

[0061] As shown in FIG. 2, the box body 30 may include a storage box portion 31 and a lid portion 32. In the example shown in FIG. 2, the storage box portion 31 includes a side plate portion 36 and a bottom plate portion 37. The storage box portion 31 is open on the first side in the first direction D1. The lid portion 32 includes a top plate portion 38. The lid portion 32 closes the opening of the storage box portion 31. The lid portion 32 may be maintained in a state of closing the opening of the storage box portion 31 by a fixture (not shown). The lid portion 32 may be swingably connected to the storage box portion 31 by a hinge (not shown).

[0062] An upper limit may be provided for the ratio of the maximum value of the distance between the exterior material 64 of the power storage element 60 housed in the box body 30 and the box body 30 to the length of the long side of the exterior material. By providing an upper limit for this ratio, as will be described later, the performance of a plurality of power storage elements 60 can be evaluated more accurately and efficiently through a performance test using one thermostatic chamber 10. The maximum value of the distance between the exterior material 64 of the power storage element 60 housed in the box body 30 and the box body 30 may be 10% or less, 8% or less, or 5% or less of the length of the long side of the exterior material. No lower limit is particularly set for this ratio. This ratio may be 0% or more, or greater than 0%.

[0063] Here, the "distance" means the shortest length from each position of the power storage element 60 to the inner surface of the box body 30. Even when the through-hole 40 described later is formed, the "distance" is determined on the premise that the inner surface is blocked. The "maximum value of the distance" means the maximum value among the distances determined for any position of the power storage element 60 housed in the box body 30.

[0064] As shown in FIG. 2, a through-hole 40 may be provided in the wall portion 35. The through-hole 40 is a hole that penetrates the wall portion 35. The through-hole 40 allows the outside and the inside of the wall portion 35 to communicate with each other. The gas at a predetermined temperature in the constant temperature chamber 12 can enter the storage chamber 30a through the through-hole 40.

[0065] A lower limit may be set for the opening ratio of the through-hole 40. The opening ratio is the ratio of the opening area of the through-hole 40 to the surface area of the box body 30 when the through-hole 40 is not formed. The unit of the opening ratio is "%".

[0066] By setting a lower limit for the opening ratio of the through-hole 40, it becomes easier for gas to move through the through-hole 40, and heat exchange between the constant temperature chamber 12 and the storage chamber 30a can be promoted. That is, the temperature of the storage chamber 30a can be quickly approximated to the temperature of the constant temperature chamber 12. Also, by setting a lower limit for the opening ratio of the through-hole 40, it becomes easier to observe the power storage element 60 housed in the power storage element box 20 through the through-hole 40. The opening ratio of the through-hole 40 may be 10% or more, 15% or more, 20% or more, 25% or more, or 30% or more.

[0067] The upper limit of the opening ratio of the through-hole 40 is not particularly set. From the viewpoint of ensuring the rigidity of the box body 30, the opening ratio of the through-hole 40 may be 70% or less, 60% or less, or 50% or less.

[0068] The shape of the through-hole 40 is not particularly limited. In the illustrated example, the shape of the opening of the through-hole 40 is circular or elliptical. The shape of the opening of the through-hole 40 may be triangular, quadrangular, or pentagonal. The shapes and sizes of the through-holes 40 provided in the wall portion 35 may be the same as or different from each other.

[0069] Two or more through-holes 40 that are separated from each other may be provided in the wall portion 35. As shown in FIGS. 2 to 6, a plurality of through-holes 40 may be provided in the wall portion 35.

[0070] The wall portion 35 includes two plate portions facing each other with the accommodation chamber 30a therebetween, and through holes 40 may be provided in each of the two plate portions. As shown in FIG. 3, through holes 40 may be respectively provided in two plate portions facing the first direction D1 of the side plate portion 36 including four plate portions. As shown in FIG. 3, through holes 40 may be respectively provided in two plate portions facing the second direction D2 of the side plate portion 36 including four plate portions. As shown in FIGS. 4 and 5, through holes 40 may be respectively provided in the bottom plate portion 37 and the top plate portion 38 facing the third direction D3.

[0071] The wall portion 35 includes two plate portions facing each other with the accommodation chamber 30a therebetween, and facing through holes 40 may be provided in each of the two plate portions. As shown in FIG. 3, facing through holes 40 may be respectively provided in two plate portions facing the first direction D1 of the side plate portion 36 including four plate portions in a facing manner. As shown in FIG. 3, facing through holes 40 may be respectively provided in two plate portions facing the second direction D2 of the side plate portion 36 including four plate portions in a facing manner. As shown in FIGS. 4 and 5, facing through holes 40 may be respectively provided in the bottom plate portion 37 and the top plate portion 38 facing the third direction D3 in a facing manner.

[0072] The wall portion 35 includes a plurality of plate portions 36, 37, 38 facing each other with the accommodation chamber 30a therebetween, and through holes 40 may be provided in each of the plurality of plate portions 36, 37, 38. That is, the wall portion 35 includes a plurality of plate portions 36, 37, 38 facing each other with the accommodation chamber 30a therebetween, and through holes 40 may be provided in all the plate portions 36, 37, 38 included in the wall portion 35. In the examples shown in FIGS. 2 to 6, through holes 40 are provided in all the plate portions 36, 37, 38.

[0073] As shown in FIGS. 3 and 6, the box 20 for the energy storage element includes the electrical wiring 22 provided in the accommodation chamber 30a. The electrical wiring 22 is electrically connected to the energy storage element 60. In the illustrated example, the electrical wiring 22 is electrically connected to the tab 66 of the energy storage element 60. The electrical wiring 22 may be in direct contact with the tab 66, or may be electrically connected to the tab 66 via a conductive inclusion. In the figures other than FIGS. 3 and 6, the illustration of the electrical wiring 22 is omitted.

[0074] As shown in FIGS. 3 and 6, the box 20 for the energy storage element may include two or more electrical wirings 22. In the illustrated example, the box 20 for the energy storage element includes, as the electrical wiring 22, a first main electrical wiring 23A, a second main electrical wiring 23B, and a thermocouple 24.

[0075] The first main electrical wiring 23A and the second main electrical wiring 23B are electrically connected to different portions of the energy storage element 60, for example, different tabs 66. In the illustrated example, the first main electrical wiring 23A is electrically connected to the tab 66 located on the first side in the first direction D1. The second main electrical wiring 23B is electrically connected to the tab 66 located on the second side in the first direction D1.

[0076] In the illustrated example, the first main electrical wiring 23A and the second main electrical wiring 23B have the crimp terminals 25 fixed to their tips. Different from the illustrated example, the first main electrical wiring 23A and the second main electrical wiring 23B may have connectors other than the crimp terminals 25 fixed to their tips. The first main electrical wiring 23A and the second main electrical wiring 23B may have conductive clips such as alligator clips fixed to their tips. Furthermore, the method of electrical connection between the first main electrical wiring 23A and the second main electrical wiring 23B and the energy storage element 60 is not particularly limited. By fixing the first main electrical wiring 23A and the second main electrical wiring 23B and the energy storage element 60 in a state of direct contact with each other by means of resistance welding or the like, the electrical connection between the first main electrical wiring 23A and the second main electrical wiring 23B and the energy storage element 60 may be ensured. The electrical connection between the first main electrical wiring 23A and the second main electrical wiring 23B and the energy storage element 60 may be ensured via a conductive member such as metal.

[0077] As shown in FIG. 2, the tip of the thermocouple 24 may be maintained in contact with the power storage element 60 by a fixture 24a such as a tape. According to this example, the temperature of the power storage element 60 can be measured using the thermocouple 24. Different from the illustrated example, the thermocouple 24 may measure the ambient temperature of the accommodation chamber 30a. The thermocouple 24 may measure the temperature of the box body 30. In the illustrated example, the power storage element box 20 includes one thermocouple 24. The power storage element box 20 may include two or more thermocouples 24 to enable measurement of a plurality of locations of the power storage element 60.

[0078] As shown in FIGS. 3 and 6, the power storage element box 20 may include an electrical connector 28. The electrical connector 28 is electrically connected to the base end portion of the electrical wiring 22. The base end portions of the first main electrical wiring 23A and the second main electrical wiring 23B are respectively attached to the electrical connector 28. The base end portion of the thermocouple 24 is also attached to the electrical connector 28.

[0079] As shown by the dashed-dotted line in FIG. 2, the electrical wiring 19 of the constant temperature bath 10 is also electrically connected to the electrical connector 28. Power transmission to the power storage element 60 and power reception from the power storage element 60 are performed using the electrical wiring 19, the first main electrical wiring 23A, and the second main electrical wiring 23B. Using the electrical wiring 19, the measurement result of the thermocouple 24 is transmitted to an external controller, and the temperature is calculated.

[0080] As well shown in FIGS. 4 to 6, the power storage element box 20 may include a terminal block 26. The terminal block 26 is provided inside the box body 30, that is, in the accommodation chamber 30a. The terminal block 26 may be fixed to the box body 30. The terminal block 26 may be movably attached to the box body 30. The terminal block 26 may be attached to the box body 30 so as to be movable in a first direction D1 parallel to the longitudinal direction of the power storage element 60 with respect to the box body 30.

[0081] As described above, the position of the tab 66 of the power storage element 60 can be variously changed. The terminal block 26 may be fixed to the box body 30 at a position facing the tab 66 of the power storage element 60.

[0082] Using the fixture 27, the tips of the first main electrical wiring 23A and the second main electrical wiring 23B may be fixed to the terminal block 26. Using the fixture 27, the tab 66 of the power storage element 60 may be fixed to the terminal block 26. In the example shown in FIGS. 4 to 6, the fixture 27 is a screw or a bolt. A hole through which the fixture 27 passes is formed in the tab 66. The fixture 27 can pass through the tab 66 and the crimp terminal 25 and be fixed to the terminal block 26. Thereby, the tab 66 and the crimp terminal 25 can be maintained in an electrically connected state. After the test is completed, the power storage element 60 can be taken out of the box body 30 by removing the fixture 27 from the terminal block 26.

[0083] As described above, instead of the crimp terminal 25, a conductive clip (for example, an alligator clip) may be provided at the tips of the first main electrical wiring 23A and the second main electrical wiring 23B. According to this example, the tab 66 may be electrically connected to the first main electrical wiring 23A and the second main electrical wiring 23B by the clip sandwiching the tab 66 or by the clip sandwiching a conductive fixture 27. As another example, no crimp terminal 25 is provided at the tips of the first main electrical wiring 23A and the second main electrical wiring 23B, and the tips of the first main electrical wiring 23A and the second main electrical wiring 23B may be directly fixed to the terminal block 26 by the fixture 27.

[0084] As well shown in FIGS. 4 to 6, the power storage element box 20 may include a support base 42 that supports the power storage element 60 in the accommodation chamber 30a. As shown in FIG. 4, by arranging the power storage element box 20 on the support base 42, it is possible to suppress the power storage element 60 from bending in a state where the tab 66 on the terminal block 26 is arranged. Thereby, the power storage element 60 can be arranged in the accommodation chamber 30a in the same posture as the actual use state of the power storage element 60, and the reliability of the performance test can be improved. Also, the power storage element 60 can be separated from the wall portion 35 (for example, the bottom plate portion 37), and the temperature of the power storage element 60 can be made uniform.

[0085] As shown in FIGS. 4 to 6, the plurality of support bases 42 of the storage element box 20 may be included. In the example shown in FIGS. 4 to 6, two support bases 42 are arranged in the second direction D2. Each support base 42 is elongated and has a longitudinal direction in the first direction D1.

[0086] As shown in FIGS. 4 to 6, the support base 42 may include a table 43 and a base 44. The table 43 is in planar contact with the storage element 60. The table 43 supports the storage element 60 from the second side in the third direction D3. The base 44 supports the table 43 away from the bottom plate portion 37. The table 43 may be fixed to the bottom plate portion 37 via the base 44. In the illustrated example, one table 43 extending in the first direction D1 is supported by a plurality (for example, three) of bases 44 arranged in the first direction D1.

[0087] As shown in FIG. 6, a through hole 43a may be provided in the table 43. The through hole 43a may be directly opposed to the through hole 40 provided in the bottom plate portion 37 in the first direction D1.

[0088] The operation of the test apparatus 5 and the storage element box 20 having the above configuration will be described.

[0089] The test apparatus 5 is used for a test for evaluating the performance of the storage element 60. The evaluation method for evaluating the performance of the storage element includes a step of arranging a plurality of storage element boxes 20 each containing the storage element 60 in the thermostatic chamber 10, and a step of performing a test on the storage element 60 in the thermostatic layer 10.

[0090] First, the storage element 60 to be evaluated is housed in the box body 30 of the storage element box 20. Inside the storage element box 20, the electrical wiring 22 is electrically connected to the tab 66 of the storage element 60 located in the storage chamber 30a.

[0091] In the illustrated example, the storage element 60 is arranged in the storage chamber 30a of the box body 30 such that the longitudinal direction of the exterior material 64 is parallel to the first direction D1. At this time, the lid portion 32 of the box body 30 opens the upper opening of the storage box portion 31.

[0092] One tab 66 of the energy storage element 60 is disposed on one terminal block 26. The tip of the first main electrical wiring 23A is also disposed on the one terminal block 26 together with the one tab 66. Using the fixture 27, the crimp terminal 25 fixed to the tip of the one tab 66 and the first main electrical wiring 23A is fixed to the terminal block 26. Thereby, the one tab 66 and the first main electrical wiring 23A are maintained in an electrically connected state.

[0093] The other tab 66 of the energy storage element 60 is disposed on the other terminal block 26. The tip of the second main electrical wiring 23B is also disposed on the other terminal block 26 together with the other tab 66. Using the fixture 27, the crimp terminal 25 fixed to the tip of the other tab 66 and the second main electrical wiring 23B is fixed to the terminal block 26. Thereby, the other tab 66 and the second main electrical wiring 23B are maintained in an electrically connected state.

[0094] In the illustrated example, the tip of the thermocouple 24 is disposed and fixed to the position to be measured for temperature using the fixture 24a.

[0095] As described above, the arrangement of the energy storage element 60 in the accommodation chamber 30a and the installation of the electrical wiring 22 in the accommodation chamber 30a are completed. Thereafter, the opening of the box body 30 is closed by the lid portion 32. The lid portion 32 is fixed to the box body 30 in a state where the opening of the box body 30 is closed.

[0096] The above operations are performed on the energy storage element box 20 taken out from the constant temperature chamber 12 of the constant temperature bath 10. Therefore, the preparatory work for the tests related to the energy storage element 60 and the electrical wiring 22 can be easily and stably performed. Thereby, physical damage to the energy storage element 60 unintentionally and defects such as a short circuit in one energy storage element box 20 can be effectively suppressed.

[0097] Next, the battery element box 20 housing the battery element 60 is placed in the constant temperature chamber 12. A plurality of battery element boxes 20 are arranged in the constant temperature chamber 12. The battery element 60 is housed in the box body 30 of each battery element box 20. The electrical connector 28 of the battery element box 20 placed in the constant temperature chamber 12 is electrically connected to the electrical wiring 19 of the constant temperature bath 10.

[0098] In the test apparatus 5 shown in FIG. 1, the battery element box 20 housing the battery element 60 is placed on the mounting table 18 of the constant temperature bath 10. When placing the battery element box 20, the mounting table 18 is pulled out from the shelf 16 in the constant temperature chamber 12 toward the second side in the first direction D1. Therefore, the battery element box 20 can be easily placed on the mounting table 18. Next, the mounting table 18 is slid with respect to the shelf 16 and the partition wall 14 toward the first side in the first direction D1. Thereby, the battery element box 20 is arranged at a predetermined position in the accommodation chamber 30a.

[0099] The electrical wiring 19 (see FIG. 2) of the constant temperature bath 10 is electrically connected to the electrical connector 28 of each battery element box 20. This operation may be performed with the mounting table 18 pulled out from the shelf 16. This operation may also be performed with the mounting table 18 arranged in the accommodation chamber 30a together with the battery element box 20. In the illustrated example, by moving the mounting table 18 toward the accommodation chamber 30a, the electrical connector of the constant temperature bath 10 may be inserted into the electrical connector 28 of the battery element box 20 to automatically ensure electrical connection.

[0100] Thus, the process of arranging the plurality of battery element boxes 20 each housing the battery element 60 in the constant temperature bath 10 is completed. Next, a process of testing the battery element 60 is performed in the constant temperature layer 10.

[0101] After the electrical connection between the thermostat 10 and the box 20 for the power storage element is ensured, a performance test is conducted to evaluate the performance of the plurality of power storage elements 60 housed in the thermostatic chamber 12. As an example of the performance test, a charge-discharge test is exemplified. In the charge-discharge test, charging and discharging of the power storage element to be evaluated are repeated over a long period (for example, several months). During the performance test, the thermostatic chamber 12 of the thermostat 10 is set to a predetermined temperature, for example, a temperature considering the use of the power storage element 20 to be evaluated. From the results of the performance test for the plurality of power storage elements 60, the performance of the power storage element 60 can be evaluated.

[0102] By the way, problems may occur in the thermostatic chamber of the thermostat during the performance test. In a conventional test apparatus, a short circuit could occur between two power storage elements. Also, in a performance test under severe temperature conditions, problems such as combustion of any one of the power storage elements may occur. These problems occurring in the thermostatic chamber can also affect other power storage elements being tested that are unrelated to the cause of the problem. That is, due to one problem, it may become impossible to correctly evaluate the performance of a large number of power storage elements arranged in the thermostatic chamber. Furthermore, it may become necessary to re-conduct the performance test that requires a long time for a large number of power storage elements. When it becomes necessary to re-conduct the performance test over a long period, the evaluation results will be significantly delayed from the originally scheduled date.

[0103] To address such conventional problems, in one specific example of the present embodiment, the box body 30 that houses the energy storage element 60 includes a material having insulating properties and flame retardancy. Since the box body 30 that houses the energy storage element 60 includes a material having insulating properties and flame retardancy, it is possible to suppress the energy storage element 60 housed in the storage chamber 30a from short-circuiting with other energy storage elements 60 arranged in the constant temperature chamber 12 of the constant temperature bath 10. Further, even if the energy storage element 60 housed in the storage chamber 30a catches fire, it is possible to suppress the spread of fire to other energy storage elements 60 arranged in the constant temperature chamber 12. That is, even if a problem occurs in one energy storage element 60 arranged in the constant temperature chamber 12, it is possible to suppress other energy storage elements 60 arranged in the constant temperature chamber 12 from being affected by the problem. In other words, for the energy storage elements 60 that are not the target of the problem, the performance test can be continued, and the results of the performance test can be obtained as planned. Also, in the first place, since the energy storage element 60 to be evaluated is arranged in the storage chamber 30a of the box body 30, the energy storage element 60 can be physically protected. As described above, by the performance test using one constant temperature bath 10, the performance of a plurality of energy storage elements 60 can be accurately and stably evaluated.

[0104] In the above-described specific example, the box body 30 includes a wall portion 35 that partitions a storage chamber 30a for housing the energy storage element 60, and the wall portion 35 has insulating properties and flame retardancy. That is, a material having insulating properties and flame retardancy is used for the wall portion 35 that partitions the storage chamber 30a. According to this specific example, problems such as short-circuiting between a plurality of energy storage elements 60 arranged inside the constant temperature bath 10 and the spread of fire in the constant temperature chamber 12 of the constant temperature bath 10 can be more effectively suppressed. Therefore, by the performance test using one constant temperature bath 10, the performance of a plurality of energy storage elements 60 can be evaluated more accurately and more stably.

[0105] In the above-described specific example, the box body 30 includes a wall portion 35 that defines an accommodation chamber 30a for accommodating the power storage element 60. The thickness of the wall portion is 0.5 mm or more, and may be 1.0 mm or more, 2.0 mm or more, or 5.0 mm or more. According to this specific example, problems such as similar burning in the constant temperature chamber 12 of the constant temperature bath 10 can be more effectively suppressed. Therefore, the performance of a plurality of power storage elements 60 can be evaluated more accurately and stably by a performance test using one constant temperature bath 10.

[0106] In the above-described specific example, the glass transition temperature of the flame-retardant material is 100°C or more, and may be 110°C or more, 120°C or more, or 140°C or more. According to this specific example, problems such as similar burning in the constant temperature chamber 12 of the constant temperature bath 10 can be more effectively suppressed. Therefore, the performance of a plurality of power storage elements 60 can be evaluated more accurately and stably by a performance test using one constant temperature bath 10.

[0107] In a specific example of the present embodiment, the box body 30 includes a wall portion 35 that defines an accommodation chamber 30a for accommodating the power storage element 60, and a through hole 40 is provided in the wall portion 35. First, since the power storage element 60 to be evaluated is arranged in the accommodation chamber 30a of the box body 30, the power storage element 60 can be physically protected. In addition, a short circuit between a plurality of power storage elements 60 arranged in the constant temperature chamber 12 of the constant temperature bath 10 can be suppressed. On the other hand, since the through hole 40 is provided in the wall portion 35, gas can pass through the through hole 40. That is, it is possible to suppress the ambient temperature of the accommodation chamber 30a from deviating from the ambient temperature of the constant temperature chamber 12. Therefore, the performance of the power storage element 60 to be evaluated can be evaluated in a state where it is arranged in a predetermined temperature atmosphere. Further, when it is possible to observe the power storage element 60 accommodated in the box body 30 from outside the box body 30 through the through hole 40, it is possible to confirm that no abnormality has occurred in the power storage element 60 to be evaluated during the performance test. Thus, the performance of a plurality of power storage elements 60 can be accurately and stably evaluated by a performance test using one constant temperature bath 10.

[0108] In the above-described specific example, the through hole 40 is configured as follows. The opening ratio of the through hole is 10% or more, and may be 15% or more, 20% or more, 25% or more, or 30% or more. The through hole 40 includes two or more through holes that are separated from each other. The wall portion 35 includes two plate portions that face each other with the accommodation chamber 30a interposed therebetween, and the through hole 40 may include through holes provided in each of the two plate portions. The wall portion 35 includes two plate portions that face each other with the accommodation chamber 30a interposed therebetween, and the through hole 40 may include through holes provided in each of the two plate portions and facing each other. The wall portion 35 includes two plate portions that face each other with the accommodation chamber 30a interposed therebetween, and the through hole 40 may include through holes provided in each of a plurality of plate portions.

[0109] According to the configuration of the through hole 40 described above, since the passage of gas through the through hole 40 is promoted, it is possible to more effectively suppress the atmosphere temperature of the accommodation chamber 30a from deviating from the atmosphere temperature of the constant temperature chamber 12 of the constant temperature bath 10. In addition, it becomes easier to observe the power storage element 60 accommodated in the box body 30 from outside the box body 30 through the through hole 40. It is possible to more accurately confirm that no abnormality has occurred in the power storage element 60 during the performance test. As a result, the performance of a plurality of power storage elements 60 can be evaluated more accurately and stably by a performance test using one constant temperature bath 10.

[0110] In one of the above-described specific examples, the electrical wiring 22 includes two electrical wirings 23A and 23B that are connected to different tabs 66 of the power storage element 60. According to this specific example, the entire power storage element 60 including the two tabs 66 can be arranged in the accommodation chamber 30a of the box body 30. Therefore, it is possible to more effectively suppress problems such as short circuits between a plurality of power storage elements 60 arranged in the constant temperature chamber 12 of the constant temperature bath 10 and burning in the constant temperature bath 10. Furthermore, the box body 30 can more effectively physically protect the power storage element 60. As a result, the performance of a plurality of power storage elements 60 can be evaluated more accurately and stably by a performance test using one constant temperature bath 10.

[0111] In the above-described specific example, the box 20 for the energy storage element further includes a terminal block 26 to which the electrical wiring 22 and the tab 66 of the energy storage element 60 are fixed. The terminal block 26 is attached to the box body 30. According to this specific example, the tab 66 of the energy storage element 60 and the electrical wiring 22 can be fixed to the terminal block 26 attached to the box body 30. As a result, it is possible to suppress the movement of the energy storage element 60 and the electrical wiring 22 within the accommodation chamber 30a of the box body 30. Thereby, problems such as a short circuit within one energy storage element 60, a short circuit between a plurality of energy storage elements 60, and physical damage to the energy storage element 60 can be more effectively suppressed. Therefore, the performance of a plurality of energy storage elements 60 can be evaluated more accurately and stably by a performance test using one constant temperature bath 10.

[0112] In the above-described specific example, the energy storage element 60 includes an electrode body 62 including a positive electrode plate and a negative electrode plate, an exterior material 64 that houses the electrode body 62, and a tab 66 that is electrically connected to the electrode body 62 and extends from the exterior material 64. The maximum value of the distance between the exterior material 64 of the energy storage element 60 housed in the box body 30 and the box body 30 is 10% or less of the length of the long side of the exterior material 64, and may be 8% or less, or may be 5% or less. According to this specific example, the gap between the box body 30 and the energy storage element 60 can be reduced. The box body 30 can be made smaller and lighter, and the box 20 for the energy storage element can be made easier to handle. In addition, the volume of the accommodation chamber 30a can be reduced, and the temperature in the accommodation chamber 30a can be quickly brought close to the temperature of the constant temperature chamber 12. Furthermore, more boxes 20 for the energy storage element and energy storage elements 60 can be accommodated in the constant temperature chamber 12 having a certain volume. Thereby, the performance of a plurality of energy storage elements 60 can be evaluated more accurately and efficiently by a performance test using one constant temperature bath 10.

[0113] In the above-described specific example, the power storage element 60 housed in the box body 30 can be observed from outside the box body 30 through the through hole 40. According to this specific example, it is possible to confirm that no abnormality has occurred in the power storage element 60 to be evaluated during the performance test. Therefore, by using a single constant temperature bath 10 for the performance test, the performance of a plurality of power storage elements 60 can be evaluated more accurately and stably.

[0114] In the embodiment described above, the box 20 for power storage element is disposed in the constant temperature bath 10 in which the performance test of the power storage element 60 is carried out. It includes a box body 30 that houses the power storage element 60, and electrical wirings 22, 23A, 23B that extend inside the box body 30 and are electrically connected to the tabs 66 of the power storage element 60. The box 20 for power storage element includes a material having insulating and flame-retardant properties. According to the box 20 for power storage element of this embodiment, since the power storage element 60 to be evaluated is disposed in the accommodation chamber 30a of the box body 30, the power storage element 60 can be physically protected. Further, since the box body 30 that houses the power storage element 60 includes a material having insulating and flame-retardant properties, it is possible to suppress the power storage element 60 housed in the accommodation chamber 30a from short-circuiting with other power storage elements 60 disposed in the constant temperature bath 10. Even if the power storage element 60 housed in the accommodation chamber 30a burns, it is possible to suppress the spread of fire to other power storage elements 60 disposed in the constant temperature bath 10. Thus, by using a single constant temperature bath 10 for the performance test, the performance of a plurality of power storage elements 60 can be evaluated accurately and stably.

[0115] In the embodiment described above, the test apparatus 5 is an apparatus for performing a performance test on the energy storage element 60. The test apparatus 5 includes a thermostatic chamber 10 and a plurality of boxes 20 for energy storage elements disposed within the thermostatic chamber 10. Each box 20 for an energy storage element can accommodate the energy storage element 60. According to the test apparatus 5 according to the present embodiment, since the energy storage element 60 to be evaluated is disposed in the accommodation chamber 30a of the box body 30, the energy storage element 60 can be physically protected. Further, it is possible to suppress the energy storage element 60 accommodated in the accommodation chamber 30a from short-circuiting with other energy storage elements 60 disposed within the thermostatic chamber 10. As a result, the performance of a plurality of energy storage elements 60 can be accurately and stably evaluated by a performance test using a single thermostatic chamber 10.

[0116] Although one embodiment has been described with reference to specific examples, the above-described specific examples do not limit one embodiment. The one embodiment described above can be implemented with various other specific examples, and various omissions, replacements, changes, additions, etc. can be made without departing from the gist thereof.

Explanation of Reference Numerals

[0117] D1: First direction, D2: Second direction, D3: Third direction, 5: Test apparatus, 10: Thermostatic chamber, 12: Constant temperature room, 14: Partition wall, 16: Shelf, 18: Mounting table, 20: Box for energy storage element, 22: Electrical wiring, 23A: First main electrical wiring, 23B: Second main electrical wiring, 24: Thermocouple, 24a: Fixture, 25: Crimp terminal, 26: Terminal block, 27: Fixture, 28: Electrical connector, 30: Box body, 30a: Accommodation chamber, 31: Accommodation box portion, 32: Lid portion, 35: Wall portion, 36: Side plate portion, 37: Bottom plate portion, 38: Top plate portion, 40: Through hole, 42: Support base, 43: Table, 43a: Through hole, 44: Base, 60: Energy storage element, 62: Electrode body, 64: Exterior material, 66: Tab

Claims

1. A box for a storage element, which is disposed in a thermostatic chamber where a performance test of the storage element is carried out, including a box body made of a material having insulation and flame retardancy and housing the storage element, and an electrical wiring extending in the box body and electrically connected to the storage element. The box for a storage element is provided with the above.

2. The box body includes a wall portion that partitions a storage chamber for housing the storage element, and the thickness of the wall portion is 0.5 mm or more. The box for a storage element according to claim 1.

3. The glass transition temperature of the material is 100° C. or more. The box for a storage element according to claim 1.

4. The box body includes a wall portion that partitions a storage chamber for housing the storage element, and a through hole is provided in the wall portion. The box for a storage element according to claim 1.

5. A box for a storage element, which is disposed in a thermostatic chamber where a performance test of the storage element is carried out, including a box body including a wall portion that partitions a storage chamber for housing the storage element, and an electrical wiring extending in the box body and electrically connected to the storage element. The box for a storage element is provided with the above, and a through hole is provided in the wall portion.

6. The opening ratio of the through hole is 10% or more. The box for a storage element according to claim 4 or 5.

7. The through hole includes two or more through holes that are spaced apart from each other. The box for a storage element according to claim 4 or 5.

8. The wall portion includes two plate portions that face each other with the storage chamber therebetween, and the through hole includes through holes provided in each of the two plate portions. The box for a storage element according to claim 4 or 5.

9. The wall portion includes two plate portions that face each other with the storage chamber therebetween, and the through hole includes through holes provided in each of the two plate portions and facing each other. The box for a storage element according to claim 4 or 5.

10. The wall portion includes a plurality of plate portions that face each other with the storage chamber therebetween, and the through hole includes through holes provided in each of the plurality of plate portions. The box for a storage element according to claim 4 or 5.

11. The storage element accommodated in the box body can be observed from outside the box body through the through hole. The box for a storage element according to claim 4 or 5.

12. The storage element includes an electrode body, an exterior material that houses the electrode body, and a tab that is electrically connected to the electrode body and extends from the exterior material, and the electrical wiring includes two electrical wirings that are electrically connected to different tabs of the storage element. The box for a storage element according to claim 1 or 5.

13. The storage element includes an electrode body, an exterior material that houses the electrode body, and a tab that is electrically connected to the electrode body and extends from the exterior material, further includes a terminal block to which the electrical wiring and the tab of the storage element are fixed, The terminal block is attached to the box body. The box for a storage element according to claim 1 or 5.

14. The storage element includes an electrode body and an exterior material that houses the electrode body, The maximum value of the distance between the exterior material of the storage element housed in the box body and the box body is 10% or less of the length of the long side of the exterior material. The box for a storage element according to claim 1 or 5.

15. A test device for performing a performance test of a storage element, a thermostatic chamber, and a plurality of boxes for storage elements arranged in the thermostatic chamber. Each box for a storage element is capable of housing the storage element. The test device.

16. A test device for performing a performance test of a storage element, a thermostatic chamber, and a plurality of boxes for storage elements arranged in the thermostatic chamber. Each box for a storage element is the box for a storage element according to claim 1 or 5. The test device.

17. An evaluation method for evaluating the performance of a storage element, including the steps of arranging a plurality of boxes for storage elements each housing the storage element in a thermostatic chamber, and performing a test on the storage element in the thermostatic layer. The evaluation method.

18. An evaluation method for evaluating the performance of a storage element, including the steps of arranging a plurality of boxes for storage elements each housing the storage element in a thermostatic chamber, and performing a test on the storage element in the thermostatic layer. Each box for a storage element is the box for a storage element according to claim 1 or 5. The evaluation method.

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