X-ray analysis system

Abstract

The present invention addresses the problem of providing an X-ray analysis system with which it is possible to appropriately observe the state of an electrode. An X-ray analysis system acquires analysis data by irradiating a battery cell, which is provided with a battery and a laminate that accommodates the battery, with X-rays. This X-ray analysis system is provided with: a sample holder capable of constraining a battery cell; a holding device that holds the sample holder and is capable of switching a position indicating irradiation of X-rays to the battery cells constrained on the sample holder; the charging and discharging device is used for charging and discharging the battery monomers constrained on the sample holding piece; the sample holder has a transmissive portion that can transmit X-rays through a plurality of dots of the battery cells.

Description

TECHNICAL FIELD

[0001] The present application relates to a system for X-ray analysis. BACKGROUND

[0002] Conventionally, as a method of observing the electrode state of a secondary battery module, X-ray analysis is known. The electrode state is, for example, the state of charge (SOC) indicating the state of charge. The X-ray analysis can observe the electrode state of the secondary battery module without processing the secondary battery module for observation, unlike a method of observing the cross section of the electrode by a scanning electron microscope (SEM). Therefore, it is widely used as a method of observing the electrode state of the secondary battery module (for example, Patent Literature 1). The system for X-ray analysis described in Patent Literature 1 is provided with a sample switching device for switching a stacked cell (secondary battery module) disposed at a passing position of X-rays. In the system for X-ray analysis described in Patent Literature 1, the sample switching device switches the stacked cell disposed at the passing position of X-rays, whereby X-ray analysis of a plurality of stacked cells can be efficiently performed.

[0003] [Patent Literature]

[0004] [Patent Literature]

[0005] Patent Literature 1: Japanese Patent Application Publication No. 2015-232546 SUMMARY

[0006] [Problems to be Solved by the Invention]

[0007] In a large secondary battery module, the electrode state of the secondary battery module can be deviated in the plane of the secondary battery module. However, the system for X-ray analysis described in Patent Literature 1 observes the electrode state of only a prescribed point in the plane of the secondary battery module. Therefore, when the system for X-ray analysis described in Patent Literature 1 is deviated in the plane of the secondary battery module, the electrode state can not be properly observed.

[0008] The present application is to solve the above-described problems, and aims to provide a system for X-ray analysis capable of properly observing the electrode state.

[0009] [Means of Solving the Problems]

[0010] (1) The X-ray analysis system of the present application is an X-ray analysis system that irradiates an X-ray to a battery cell having a battery and a battery stack that houses the battery, and acquires analysis data, and includes: a sample holder that can hold the battery cell; a holding device that holds the sample holder and can switch an irradiation position at which the X-ray is irradiated to the battery cell held by the sample holder; and a charge / discharge device that charges and discharges the battery cell held by the sample holder, wherein the sample holder has a transmission portion that can transmit the X-ray to a plurality of points on the battery cell.

[0011] (2) The X-ray analysis system according to (1), wherein the transmission portion can also include a plurality of partial transmission portions that are point-shaped.

[0012] (3) The X-ray analysis system according to (1), wherein the transmission portion can also have a wavy shape.

[0013] (4) The X-ray analysis system according to (1) or (2), wherein the sample holder has: a first holding member that is irradiated with the X-ray and is provided with the transmission portion; a second holding member that is irradiated with the X-ray transmitted through the first holding member; and a buffer member that is disposed between the first holding member and the battery cell, and the sample holder can hold and hold the battery cell from both surfaces of the battery cell through the first holding member and the second holding member.

[0014] (5) The X-ray analysis system according to (4), wherein the first holding member has an X-ray irradiation portion that is irradiated with the X-ray from an irradiation direction, the first holding member has a thick wall portion and a thin wall portion that is shorter in length along the irradiation direction than the thick wall portion, and the transmission portion can also be provided to the thin wall portion.

[0015] (6) The X-ray analysis system according to (4), wherein the second holding member has an additional transmission portion through which the X-ray transmitted through the transmission portion is transmitted, the transmission portion is a gap formed in the first holding member, the additional transmission portion is a gap formed in the second holding member, and a width of the transmission portion can be smaller than a width of the additional transmission portion.

[0016] (7) The X-ray analysis system according to (4), wherein the first holding member has an X-ray irradiation portion that is irradiated with the X-ray from an irradiation direction, the second holding member has an additional transmission portion through which the X-ray transmitted through the transmission portion is transmitted, the additional transmission portion is a gap formed in the second holding member, and a width of the gap formed in the second holding member can increase as it moves away from the first holding member when viewed along the irradiation direction.

[0017] (8) The system for X-ray analysis according to (1) or (2), wherein the system for X-ray analysis further comprises a detection device that detects the X-rays transmitted through the sample holder to acquire data for X-ray analysis, the holding device switches the irradiation position to a plurality of points, and the charge / discharge device performs the same mode of charge / discharge at the same state of charge at each of the plurality of points, whereby the detection device can also detect the X-rays transmitted through the sample holder at each of the plurality of points to acquire the electrode state distribution during the charge / discharge.

[0018] [Effects of Invention]

[0019] According to the above (1), the sample holder has a transmission portion. The transmission portion enables the X-rays to be transmitted through the plurality of points P of the battery cell. Therefore, the X-rays can be irradiated at the plurality of points in the plane of the battery cell and the transmitted X-rays can be analyzed. As a result, even when there is a deviation at each site in the plane of the battery cell, the electrode state (e.g., SOC) can be appropriately observed. Therefore, the electrode state distribution in the plane of the battery cell during the charge / discharge can be appropriately observed.

[0020] According to the above (2), the transmission portion includes a plurality of point-like local transmission portions. Therefore, the transmission portion can be provided only at the required points. For example, when the transmission portion is a hole in the first constraint member, the number of holes can be reduced. Therefore, the strength and rigidity of the first constraint member can be improved.

[0021] According to the above (3), the transmission portion 270 has a wavy shape, and therefore the transmission portion enables the X-rays to be transmitted through a plurality of points on the battery cell over a wide range in the lateral and longitudinal directions of the battery cell. Therefore, the electrode state can be observed over a wide range in the plane of the battery cell. As a result, the electrode state can be appropriately observed.

[0022] According to the above (4), when the transmission portion is a gap, the force applied to the battery cell can be deviated in the plane. However, in the sample holder, the cushion member is disposed between the first constraint member and the battery cell. Therefore, the force applied to the battery cell can be balanced.

[0023] According to the above (5), the transmission portion is provided in the thin-walled portion. Therefore, the strength and rigidity of the first constraint member can be improved while suppressing the absorption of X-rays in the first constraint member.

[0024] According to the above (6), the width of the transmission portion is smaller than the width of the additional transmission portion. That is, the width of the additional transmission portion on the X-ray detection side is larger than the width of the transmission portion on the X-ray irradiation side. Therefore, a uniform electrode state can be obtained in the width direction of the battery cell.

[0025] According to the above (7), the width of the additional transmission portion increases as it moves away from the first restriction member, as viewed from the first restriction member side. Therefore, the width of the additional transmission portion on the X-ray detection side is greater than the width on the X-ray irradiation side.

[0026] According to the above (8), in the X-ray analysis system, the holding device switches the irradiation position to a plurality of points, the charge / discharge device performs the same pattern of charge / discharge at the same state of charge on the battery cell 600 at each of the plurality of points, and the detection device detects the X-rays transmitted through the sample holder at each of the plurality of points. Therefore, the X-rays can be irradiated at a plurality of points in the plane of the battery cell and the transmitted X-rays can be analyzed. As a result, even when there is a variation at each site in the plane of the battery cell, the electrode state (e.g., SOC) can be appropriately observed. Therefore, the electrode state distribution in the plane of the battery cell during the charge / discharge process can be appropriately observed. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a block diagram of an X-ray analysis system according to an embodiment of the present application.

[0028] Figure 2 is a schematic exploded perspective view of a sample holder.

[0029] Figure 3 is a schematic front view of the sample holder as viewed from the irradiation direction.

[0030] Figure 4 is a schematic exploded front view of a first restriction member as viewed from the irradiation direction.

[0031] Figure 5 is a schematic exploded front view of a second restriction member as viewed from the irradiation direction.

[0032] Figure 6A is a schematic cross-sectional view along the XIA-XIA line of Figure 3 .

[0033] Figure 6B is a schematic cross-sectional view along the XIB-XIB line of Figure 3 .

[0034] Figure 7 is a schematic exploded perspective view of a sample holder.

[0035] Figure 8A is a schematic front view of the sample holder as viewed from the -Z direction side.

[0036] Figure 8B is a schematic rear view of the sample holder as viewed from the +Z direction side.

[0037] Figure 9is a schematic cross-sectional view along the IX-IX line of Figure 8A .

[0038] Figure 10 is a graph showing an example of a simulation result of an in-plane distribution of SOC of a battery cell.

[0039] Figure 11 is a graph showing an example of an X-ray analysis result of SOC of a battery cell. DETAILED DESCRIPTION

[0040] [Embodiment 1]

[0041] Embodiments of the present application will be described below based on the drawings. Referring to Figure 1 , a system 1 for X-ray analysis of Embodiment 1 of the present application will be described. Figure 1 is a block diagram of the system 1 for X-ray analysis of Embodiments of the present application. In the following description, the X-axis direction of the coordinates shown in Figure 1 will be referred to as the left-right direction (the direction that is positive on the X-axis from the origin will be referred to as the right direction), the Z-axis direction will be referred to as the front-back direction (the direction that is positive on the Y-axis from the origin will be referred to as the front direction), and the Y-axis direction (the direction that is perpendicular to the XZ plane) will be referred to as the up-down direction (the direction that is positive on the Y-axis from the origin will be referred to as the up direction).

[0042] As shown in Figure 1 , the system 1 for X-ray analysis is provided with an X-ray irradiation device 100, a sample holder 200, a holding device 300, a charge-discharge device 400, and a detection device 500. The system 1 for X-ray analysis acquires analysis data by irradiating an X-ray to a battery cell 600. The system 1 for X-ray analysis acquires analysis data by, for example, an in-situ X-ray Diffraction (XRD) method or an in-situ X-ray Absorption Fine Structure (XAFS) method.

[0043] The X-ray irradiation device 100 irradiates an X-ray X1 to the sample holder 200. That is, the X-ray irradiation device 100 irradiates the X-ray X1 along an irradiation direction D1. The irradiation direction D1 is a direction from the -Z side toward the +Z side.

[0044] The sample holder 200 is capable of restraining the battery cell 600. Details of the sample holder 200 will be described below with reference to the drawings that follow. Figure 2

[0045] ​The holding device 300 is used to hold the sample holder 200. The holding device 300 can switch the irradiation position P. The irradiation position P indicates the position where X-ray X1 is irradiated onto the battery cell 600 constrained on the sample holder 200. The holding device 300 is, for example, an actuator. The holding device 300 switches the irradiation position P within the plane (XY plane) of the battery cell 600 by moving the sample holder 200 along the X-axis and Y-axis directions.

[0046] The charging and discharging device 400 charges and discharges the battery cells 600 constrained on the sample holder 200. The charging and discharging device 400 may, for example, repeatedly charge and discharge the battery cells 600 within a predetermined time period. The charging and discharging device 400 may continue charging and discharging, for example, while the detection device 500 detects X-ray X2. Alternatively, the charging and discharging device 400 may stop charging and discharging while the detection device 500 detects X-ray X2.

[0047] The detection device 500 detects X-rays X2 that have passed through the sample holder 200 to obtain data for X-ray analysis. That is, the detection device 500 detects X-rays X2 that have passed through the battery cell 600 constrained on the sample holder 200 to obtain data for X-ray analysis.

[0048] In the X-ray analysis system 1, the holding device 300 switches the irradiation position P to multiple points, and the charging and discharging device 400 charges and discharges the battery cells in the same mode under the same charging state at each of the multiple points P. Meanwhile, the detection device 500 detects the X-rays X2 transmitted through the sample holder 200 at each of the multiple points P, thereby acquiring the electrode state distribution during the charging and discharging process. Therefore, the electrode state can be appropriately observed.

[0049] refer to Figures 1 to 5 The sample holder 200 will be described. Figure 2 This is a schematic exploded perspective view of the sample holder 200. Figure 3 This is a schematic front view of the sample holder 200 as viewed from the irradiation direction D1. Figure 4 This is a schematic exploded front view of the first constraint component 210 as viewed from the illumination direction D1. Figure 5 This is a schematic exploded front view of the second constraint component 260 as viewed from the illumination direction D1.

[0050] like Figure 2As shown, the sample holder 200 includes a first constraint member 210, a buffer member 220, a first insulating member 230, a second insulating member 250, a second constraint member 260, a transmission section 270, and an additional transmission section 280. The first constraint member 210, buffer member 220, first insulating member 230, second insulating member 250, and second constraint member 260 are arranged from the rear side (-Z direction side) in the following order: first constraint member 210, buffer member 220, first insulating member 230, second insulating member 250, and second constraint member 260. The sample holder 200 clamps and constrains the battery cell 600 from both surfaces of the battery cell 600 through the first constraint member 210 and the second constraint member 260.

[0051] The battery cell 600 comprises a battery 610 and a stack 620. The battery 610 is a lithium-ion all-solid-state battery. The battery 610 has a positive terminal 612, a negative terminal 614, and a solid electrolyte (not shown). Furthermore, the battery 610 is not limited to a lithium-ion all-solid-state battery; the electrolyte may also be liquid. The stack 620 houses the battery 610. Specifically, the stack 620 seals the battery 610.

[0052] The first constraint member 210 is located on one side (-Z direction side) of the battery cell 600. The first constraint member 210 is, for example, plate-shaped. The first constraint member 210 has, for example, a rectangular shape on its main surface. The first constraint member 210 is formed of a material that X-rays cannot penetrate. The first constraint member 210 is, for example, formed of metal. X-rays X1 are irradiated onto the first constraint member 210.

[0053] like Figure 3 and Figure 4 As shown, the first constraint member 210 has an upper member 211 and a lower member 212. Figure 3 As shown, the first constraint member 210 has an X-ray irradiated portion 213. The X-ray irradiated portion 213 represents the part that can be irradiated with X-rays. For example... Figure 4 As shown, the upper component 211 has an upper main body portion 2111, an upper protrusion 2113, and an upper recess 2114.

[0054] An upper through hole 2112 is formed in the upper main body portion 2111. The upper through hole 2112 is a hole that extends through the upper main body portion 2111 along the thickness direction (Z-axis direction). A bolt B1 is inserted into the upper through hole 2112 (see reference). Figure 2 The upper convex portion 2113 is the part that protrudes from the upper main body portion 2111. The upper concave portion 2114 is the part that is more recessed than the upper convex portion 2113.

[0055] The lower component 212 has a lower main body portion 2121, a lower protrusion 2123, and a lower recess 2124. A lower through hole 2122 is formed in the lower main body portion 2121. The lower through hole 2122 is a hole that extends along the thickness direction (Z-axis direction) of the lower main body portion 2121. Bolt B1 (reference) Figure 2 It is inserted into the lower through hole 2122. The lower protrusion 2123 is the part that protrudes from the lower main body part 2121. The lower recess 2124 is the part that is more recessed than the lower protrusion 2123.

[0056] like Figure 3 As shown, the upper component 211 and the lower component 212 are configured to face each other in the Y-axis direction with a gap between them. More specifically, the upper component 211 and the lower component 212 are configured such that the upper protrusion 2113 and the lower recess 2124 face each other in the Y-axis direction. More specifically, the upper component 211 and the lower component 212 are configured such that the lower protrusion 2123 and the upper recess 2114 face each other in the Y-axis direction.

[0057] Refer again Figure 2 A buffer member 220 is disposed between the first constraint member 210 and the battery cell 600. The buffer member 220 is, for example, plate-shaped. The buffer member 220 has, for example, a rectangular shape on its main surface. The buffer member 220 is, for example, formed of urethane foam.

[0058] The first insulating member 230 is located on one side (-Z direction side) of the battery cell 600. The first insulating member 230 has, for example, a rectangular shape on its main surface. The first insulating member 230 is, for example, rectangular. The first insulating member 230 is formed of an insulating material. The first insulating member 230 is, for example, formed of resin. The first insulating member 230 is formed of an X-ray transmissible material. The first insulating member 230 is capable of transmitting X-rays through, for example, an X-ray irradiation device 100 (see reference). Figure 1 X-rays X1 irradiated by the radiation.

[0059] The second insulating member 250 is located on the other side (+Z direction side) of the battery cell 600. The second insulating member 250 is, for example, plate-shaped. The second insulating member 250 has, for example, a rectangular shape on its main surface. The second insulating member 250 is formed of an insulating material. The second insulating member 250 is, for example, formed of resin. The second insulating member 250 is formed of an X-ray transmissible material. The second insulating member 250 is capable of transmitting, for example, X-rays that have passed through the battery cell 600.

[0060] The second constraint member 260 is located on the other side (+Z direction side) of the battery cell 600. The second constraint member 260 is, for example, plate-shaped. The second constraint member 260 has, for example, a rectangular shape on its main surface. The second constraint member 260 is made of a material that X-rays cannot penetrate. The second constraint member 260 is, for example, made of metal. X-rays that have passed through the first constraint member 210 irradiate the second constraint member 260.

[0061] The second constraint member 260 has an upper member 261 and a lower member 262. For example... Figure 5 As shown, the upper component 261 has an upper main body portion 2611, an upper protrusion 2613, and an upper recess 2614.

[0062] An upper through hole 2612 is formed in the upper main body portion 2611. The upper through hole 2612 is a hole that extends through the upper main body portion 2611 along the thickness direction (Z-axis direction). A bolt B1 is inserted into the upper through hole 2612 (see reference). Figure 2 The upper convex portion 2613 is the part that protrudes from the upper main body portion 2611. The upper concave portion 2614 is the part that is more recessed than the upper convex portion 2613.

[0063] The lower component 262 has a lower main body portion 2621, a lower protrusion 2623, and a lower recess 2624. A lower through hole 2622 is formed in the lower main body portion 2621. The lower through hole 2622 is a hole that extends along the thickness direction (Z-axis direction) of the lower main body portion 2621. Bolt B1 (reference) Figure 2 It is inserted into the lower through hole 2622. The lower protrusion 2623 is the part that protrudes from the lower main body part 2621. The lower concave part 2624 is the part that is more recessed than the lower protrusion 2623.

[0064] The transmission section 270 transmits X-rays. Specifically, the transmission section 270 transmits, for example, X-rays X1 irradiated from the X-ray irradiation device 100. Figure 3As shown, in this embodiment, the transmission portion 270 is provided on the first constraint member 210. In this embodiment, the transmission portion 270 is a gap formed on the first constraint member 210. Alternatively, the transmission portion 270 may not be a gap formed on the first constraint member 210, but may be provided by blocking the gap formed on the first constraint member 210 with a material that does not easily absorb X-rays. For example, the transmission portion 270 may be provided by blocking the gap formed on the first constraint member 210 with carbon. In this embodiment, the transmission portion 270 has a wavy shape. The transmission portion 270 enables X-rays to pass through multiple points P of the battery cell 600. Points P1, P2, P3, P4, and P5 are examples of multiple points P. Multiple points P can be provided in the region corresponding to the transmission portion 270. Therefore, the state of the battery cell 600 can be observed at multiple points P. Therefore, the state of the electrodes in the plane of the battery cell 600 can be observed. As a result, the electrode state can be properly observed. Furthermore, in this embodiment, the transmission portion 270 has a wavy shape. Therefore, the transmission section 270 can transmit X-rays through multiple points P of the battery cell 600 over a wide range in both the transverse (X-axis direction) and longitudinal (Y-axis direction) directions. Consequently, the electrode state can be observed over a wide range within the plane of the battery cell 600. As a result, the electrode state can be properly observed. In this embodiment, the width of the transmission section 270 (the width of the gap between the upper member 211 and the lower member 212) is fixed. However, the width of the transmission section 270 can also vary locally.

[0065] The additional transmission section 280 can transmit X-rays. Specifically, the additional transmission section 280 can, for example, allow X-rays that have passed through the transmission section 270 to pass through. In this embodiment, the additional transmission section 280 is provided on the second constraint member 260. In this embodiment, the additional transmission section 280 is formed in a gap in the second constraint member 260. Alternatively, the additional transmission section 280 may not be formed in a gap in the second constraint member 260, but may be provided by forming a gap in the second constraint member 260 through a material that does not easily absorb X-rays. For example, the additional transmission section 280 may be provided by forming a gap in the second constraint member 260 through carbon blockage. In this embodiment, the additional transmission section 280 has a wavy shape. The X-rays X2 that have passed through the additional transmission section 280, that is, the X-rays X2 that have passed through the sample holder 200 after passing through the battery cell 600, reach the detection device 500 (reference). Figure 1Therefore, the detection device 500 acquires X-ray analysis data by detecting X-ray X2. As a result, the electrode state can be observed at multiple points P within the plane of the battery cell 600. Therefore, the electrode state can be observed appropriately. Furthermore, in this embodiment, the additional transmission section 280 has a wavy shape. Therefore, the additional transmission section 280 can transmit X-rays at multiple points P of the battery cell 600 to the detection device 500 over a wide range in the transverse (X-axis direction) and longitudinal (Y-axis direction) directions of the battery cell 600. Therefore, the electrode state can be observed over a wide range within the plane of the battery cell 600. As a result, the electrode state can be observed appropriately. In this embodiment, the width of the additional transmission section 280 (the width of the gap between the upper member 261 and the lower member 262) is fixed. However, the width of the additional transmission section 280 may vary locally.

[0066] refer to Figure 6A and Figure 6B Further explanation is given regarding the sample holder 200. Figure 6A It is along Figure 3 A schematic cross-sectional view of the XIA-XIA line. Figure 6B It is along Figure 3 A schematic cross-sectional view of the XIB-XIB line.

[0067] like Figure 6A and Figure 6B As shown, the first constraint member 210 has a thick-walled portion 216 and a thin-walled portion 217. The thickness of the thin-walled portion 217 is less than that of the thick-walled portion 216. The transmission portion 270 is provided in the thin-walled portion 217. The upper through hole 2112 (see reference) Figure 4 ) and the lower through hole 2122 (reference) Figure 4 It is formed in the thick-walled part 216.

[0068] The second constraint member 260 has a thick-walled portion 266 and a thin-walled portion 267. The thickness of the thin-walled portion 267 is less than that of the thick-walled portion 266. An additional transmission portion 280 is provided in the thin-walled portion 267. A through hole 2612 is located on the upper side (see reference). Figure 5 ) and the lower through hole 2622 (reference) Figure 5 It is formed in the thick-walled part 216.

[0069] In this embodiment, the width (length along the Y-axis) of the transmission section 270 is the same as the width (length along the Y-axis) of the additional transmission section 280. Alternatively, the width of the transmission section 270 may differ from the width of the additional transmission section 280. In this case, the width of the transmission section 270 is preferably smaller than the width of the additional transmission section 280. Since the additional transmission section 280 is positioned corresponding to the transmission section 270, the X-ray X1 irradiated from the X-ray irradiation device 100 passes through the transmission section 270, passes through the battery cell 600, and then passes through the additional transmission section 280, finally reaching the detection device 500 as X-ray X2.

[0070] As mentioned above, refer to Figure 1 As shown in Figure 6, in the X-ray analysis system 1 of this embodiment, the sample holder 200 has a transmission section 270. The transmission section 270 allows X-rays to pass through multiple points P of the battery cell 600. Therefore, X-rays can be irradiated at multiple points P within the plane of the battery cell 600 to perform analysis of the transmitted X-rays. As a result, even when there is a deviation at each location within the plane of the battery cell 600, the electrode state (e.g., SOC) can be properly observed. Therefore, the electrode state distribution within the plane of the battery cell 600 during the charging and discharging process can be properly observed.

[0071] Furthermore, the transmission section 270 has a wave-like shape, so that X-rays can be transmitted through multiple points P of the battery cell 600 over a wide range in both the transverse (X-axis direction) and longitudinal (Y-axis direction) directions of the battery cell 600. Therefore, the electrode state can be observed over a wide range within the plane of the battery cell 600. As a result, the electrode state can be properly observed.

[0072] Furthermore, when the transmission section 270 is a gap, the force applied to the battery cell 600 may deviate in-plane. However, in the sample holder 200, the buffer member 220 is disposed between the first constraint member 210 and the battery cell 600. Therefore, the force applied to the battery cell 600 can be balanced.

[0073] Furthermore, the transmission portion 270 is provided in the thin-walled portion 217. Therefore, it is possible to suppress X-ray absorption in the first constraint member 210 while improving the strength and rigidity of the first constraint member 210.

[0074] Furthermore, in the X-ray analysis system 1, the holding device 300 switches the irradiation position P to multiple points, and the charging / discharging device 400 charges and discharges the battery cell 600 in the same mode under the same charging state at each of the multiple points. Thereby, the detection device 500 detects the X-rays X2 transmitted through the sample holder 200 at each of the multiple points. Therefore, X-rays can be irradiated at multiple points P within the plane of the battery cell 600, and analysis of the transmitted X-rays can be performed. As a result, even when there are deviations at each location within the plane of the battery cell 600, the electrode state (e.g., SOC) can be properly observed. Therefore, the distribution of the electrode state within the plane of the battery cell 600 during the charging and discharging process can be properly observed.

[0075] [Implementation Method 2]

[0076] refer to Figures 7 to 9 This describes the X-ray analysis system 1 of Embodiment 2 of the present invention. Figure 7 This is a schematic exploded perspective view of the sample holder 200 according to Embodiment 2 of the present invention. Figure 8A This is a schematic front view of the sample holder 200 as viewed from the -Z direction side. Figure 8B This is a schematic rear view of the sample holder 200 as viewed from the +Z direction side. Figure 9 It is along Figure 8A A schematic cross-sectional view of the IX-IX line. The X-ray analysis system 1 of Embodiment 2 differs from the X-ray analysis system 1 of Embodiment 1 in that the transmission section 270 and the additional transmission section 280 are different. The differences between Embodiment 2 and Embodiment 1 will be mainly explained below.

[0077] like Figure 7 As shown, the sample holder 200 includes a first constraint member 210, a buffer member 220, a first insulating member 230, a second insulating member 250, a second constraint member 260, a transmissive portion 270, and an additional transmissive portion 280. Furthermore, in Embodiment 2, the arrangement of the buffer member 220 and the first insulating member 230 differs from that in Embodiment 1.

[0078] like Figure 8AAs shown, the first constraint member 210 has a main body 218. A through hole 2182 is formed on the main body 218. The through hole 2162 is a hole that extends along the thickness direction (Z-axis direction) of the main body 218. A bolt B1 is inserted into the through hole 2162. A transmission part 270 is provided on the first constraint member 210. In this embodiment, the transmission part 270 includes a plurality of partial transmission parts 272. In this embodiment, the transmission part 270 includes nine partial transmission parts 272. The nine partial transmission parts 272 are arranged at intervals along the X-axis direction and the Y-axis direction. In this embodiment, the nine partial transmission parts 272 are arranged in a matrix of three in the X-axis direction and three in the Y-axis direction. Each of the plurality of partial transmission parts 272 is a point. The plurality of partial transmission parts 272 are provided on the first constraint member 210. Each of the plurality of partial transmission parts 272 is a hole that extends along the thickness direction (Z-axis direction) of the main body 218.

[0079] like Figure 8B As shown, the second constraint member 260 has a main body 268. A through hole 2682 is formed on the main body 268. The through hole 2682 is a hole that extends along the thickness direction (Z-axis direction) of the main body 268. A bolt B1 is inserted into the through hole 2682. An additional transmission portion 280 is provided on the second constraint member 260. The additional transmission portion 280 includes a plurality of partial additional transmission portions 282. In this embodiment, the additional transmission portion 280 includes nine partial additional transmission portions 282. The nine partial transmission portions 282 are arranged at intervals along the X-axis direction and the Y-axis direction. In this embodiment, the nine partial additional transmission portions 282 are arranged in a matrix of three in the X-axis direction and three in the Y-axis direction. In this embodiment, each of the plurality of partial additional transmission portions 282 is point-like. The plurality of partial additional transmission portions 282 are provided on the second constraint member 260. Each of the multiple additional local transmission sections 282 is a hole that extends along the thickness direction (Z-axis direction) of the main body section 218.

[0080] like Figure 9 As shown, the width W1 (length along the Y-axis) of the transmissive portion 270 is smaller than the width W2 (length along the Y-axis) of the additional transmissive portion 280. When viewed from the side of the first constraint member 210, the width of the additional transmissive portion 280 increases as it moves away from the first constraint member 210. The second constraint member 260 has a wall surface 269. The wall surface 269 forms a partial transmissive portion 272. The wall surface 269 is inclined relative to the Z-axis. Specifically, the wall surface 269a is inclined towards the +Y direction relative to the Z-axis. The wall surface 269b is inclined towards the -Y direction relative to the Z-axis.

[0081] In summary, for reference Figures 7 to 9As can be seen, in the X-ray analysis system 1 of this embodiment, the transmission section 270 includes a plurality of point-like local transmission sections 272. Therefore, the transmission section 270 can be provided only at the required locations. For example, when the transmission section 270 is a hole on the first constraint member 210, the number of holes can be reduced. Therefore, the strength and rigidity of the first constraint member 210 can be improved.

[0082] Furthermore, the width W1 (length along the Y-axis) of the transmission section 270 is smaller than the width W2 (length along the Y-axis) of the additional transmission section 280. That is, the width W2 of the additional transmission section 280 on the X-ray detection side is greater than the width W1 of the transmission section 270 on the X-ray irradiation side. A uniform electrode state can be obtained in the width direction (Y-axis direction) of the battery cell 600.

[0083] Furthermore, viewed from the side of the first constraint member 210, the width W2 of the additional transmission portion 280 increases as it moves away from the first constraint member 210. Therefore, the width of the additional transmission portion 280 on the X-ray detection side is greater than its width on the X-ray irradiation side.

[0084] refer to Figure 10 This section illustrates an example of the simulation results for the in-plane distribution of the State of Charge (SOC) of a single battery cell. SOC represents the charge rate of a single battery cell. Figure 10 This is a figure illustrating an example of the simulation results showing the in-plane distribution of the State of Charge (SOC) of a single battery cell. Figure 10 In the diagram, the X and Y axes represent the X and Y coordinates of a single battery cell. Figure 10 In the diagram, the coordinates X=0 and Y=0 represent the coordinates of the negative terminal 614. Figure 10 In the diagram, the coordinates of X=0 and Y=maximum value represent the coordinates of the position of the positive terminal 612. Figure 10 In the diagram, regions R1 to R5 represent regions with roughly the same SOC. Figure 10 In the diagram, regions R1 to R5 represent regions with roughly the same SOC. Figure 10 In this context, the density of the dot pattern represents the State of Charge (SOC) value; a higher dot pattern density indicates a higher SOC. That is, in... Figure 10 In this context, SOC represents the region R1 < region R2 < region R3 < region R4 < region R5.

[0085] like Figure 10 As shown, the SOC is lowest in the regions near the maximum values ​​of X=0, Y=0, and X=0, Y=0. The SOC gradually increases as one moves away from these regions. Specifically, the SOC gradually increases as one moves away from the positive endpoint 612 and / or the negative endpoint 614. In other words, the SOC exhibits a gradient-increasing trend as one moves away from the positive endpoint 612 and / or the negative endpoint 614. Figure 10In this diagram, the State of Charge (SOC) is defined as region R1 < region R2 < region R3 < region R4 < region R5. Furthermore, for simplification, regions with roughly the same SOC are divided into five regions. However, the SOC of each of regions R1, R2, R3, R4, and R5 exhibits a gradient increasing trend as they move away from the positive terminal 612 and / or the negative terminal 614. Therefore, the SOC of a typical battery cell, especially a large battery cell, tends to deviate within the plane. Thus, for the SOC of a battery cell, especially a large battery cell, it is preferable to analyze the electrode state characteristics by measuring multiple points within the plane. The X-ray analysis system 1 of this invention can measure the electrode state of a battery cell at multiple points within the plane.

[0086] refer to Figure 11 This is an example illustrating the results of X-ray analysis of the state of charge (SOC) of a single battery cell. Figure 11 This is an example of an X-ray analysis result showing the state of charge (SOC) of a single battery cell. Specifically, Figure 11 The X-ray analysis system according to an embodiment of the present invention (reference) Figure 1 In ) use Figure 2 The sample holder 200 shown is an example of an X-ray analysis result of the state of charge (SOC) of a single battery cell at multiple points in the plane. Figure 11 In the diagram, the horizontal axis represents time. Figure 11 The vertical axis represents the diffraction angle 2θ of the peak intensity of the detected X-rays.

[0087] like Figure 11 As shown, the diffraction angle 2θ of the peak intensity of X-rays detected at multiple measurement points varies at each measurement point over time. That is, it has been confirmed that the diffraction angle 2θ of the detected peak intensity of the measured X-rays varies at each location (XY coordinate) of the battery cell over time. Therefore, for the state of charge (SOC) of a battery cell, especially the SOC of a large battery cell, it is preferable to analyze the characteristics of the electrode state by measuring the diffraction angle 2θ of the peak intensity of X-rays detected at multiple points in the plane. The X-ray analysis system 1 of the present invention can measure the electrode state at multiple points in the plane for the SOC of a battery cell.

[0088] The X-ray analysis system 1 according to this embodiment can achieve the following effects.

[0089] (1) In the X-ray analysis system 1, the sample holder 200 has a transmission section 270. The transmission section 270 allows X-rays to pass through multiple points P of the battery cell 600. Therefore, X-rays can be irradiated at multiple points P within the plane of the battery cell 600 to perform analysis of the transmitted X-rays. As a result, even if there is a deviation at each location within the plane of the battery cell 600, the electrode state (e.g., SOC) can be properly observed. Therefore, the electrode state distribution within the plane of the battery cell 600 during the charging and discharging process can be properly observed.

[0090] (2) In the X-ray analysis system 1, the transmission section 270 includes a plurality of point-like local transmission sections 272. Therefore, the transmission section 270 can be provided only at the required locations. For example, when the transmission section 270 is a hole on the first constraint member 210, the number of holes can be reduced. Therefore, the strength and rigidity of the first constraint member 210 can be improved.

[0091] (3) In the X-ray analysis system 1, the transmission section 270 has a wave-like shape, so that X-rays can be transmitted through multiple points P of the battery cell 600 over a wide range in both the transverse (X-axis direction) and longitudinal (Y-axis direction) directions of the battery cell 600. Therefore, the electrode state can be observed over a wide range within the plane of the battery cell 600. As a result, the electrode state can be properly observed.

[0092] (4) In the X-ray analysis system 1, when the transmission section 270 is a gap, the force applied to the battery cell 600 may deviate in the plane. However, in the sample holder 200, the buffer member 220 is disposed between the first constraint member 210 and the battery cell 600. Therefore, the force applied to the battery cell 600 can be balanced.

[0093] (5) In the X-ray analysis system 1, the transmission part 270 is provided in the thin-walled part 217. Therefore, the strength and rigidity of the first constraint member 210 can be improved while suppressing X-ray absorption in the first constraint member 210.

[0094] (6) In the X-ray analysis system 1, the width W1 (length along the Y-axis) of the transmission section 270 is smaller than the width W2 (length along the Y-axis) of the additional transmission section 280. That is, the width W2 of the additional transmission section 280 on the X-ray detection side is greater than the width W1 of the transmission section 270 on the X-ray irradiation side. A uniform electrode state can be obtained in the width direction (Y-axis direction) of the battery cell 600.

[0095] (7) In the X-ray analysis system 1, when viewed from the side of the first constraint member 210, the width W2 of the additional transmission section 280 increases as it moves away from the first constraint member 210. Therefore, the width of the additional transmission section 280 on the X-ray detection side is greater than the width on the X-ray irradiation side.

[0096] (8) In the X-ray analysis system 1, the holding device 300 switches the irradiation position P to multiple points, and the charging and discharging device 400 charges and discharges the battery cell 600 in the same mode under the same charging state at each of the multiple points. Meanwhile, the detection device 500 detects the X-rays X2 transmitted through the sample holder 200 at each of the multiple points. Therefore, X-rays can be irradiated at multiple points P within the plane of the battery cell 600, and analysis of the transmitted X-rays can be performed. As a result, even when there are deviations at each location within the plane of the battery cell 600, the electrode state (e.g., SOC) can be properly observed. Therefore, the distribution of the electrode state within the plane of the battery cell 600 during the charging and discharging process can be properly observed.

[0097] The embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments and various changes and modifications can be made.

[0098] Figure Labels

[0099] 200: Sample holder

[0100] 210: First constraint component

[0101] 213: X-ray irradiated part

[0102] 216: Thick-walled section

[0103] 217: Thin-walled section

[0104] 220: Buffer component

[0105] 260: Second constraint component

[0106] 266: Thick-walled section

[0107] 267: Thin-walled section

[0108] 269, 269a, 269b: wall

[0109] 270: Transmitting section

[0110] 272: Localized Transmissive Section

[0111] 280: Additional transmission section

[0112] 300: Holding device

[0113] 400: Charging and discharging device

[0114] 500: Detection device

[0115] 600: Battery cell

[0116] 610: Battery

[0117] 620: Laminated body

Claims

1. An X-ray analysis system for acquiring analytical data by irradiating a single cell containing a battery and a stack housing the battery with X-rays, said X-ray analysis system comprising: The sample holder can constrain the aforementioned battery cells; The holding device holds the aforementioned sample holder and is capable of switching the irradiation position for irradiating the aforementioned battery cell constrained on the aforementioned sample holder with the aforementioned X-rays; and, A charging and discharging device is used to charge and discharge the aforementioned battery cells that are constrained on the aforementioned sample holder. The aforementioned sample holder has a transmissive portion that allows X-rays to pass through multiple points on the aforementioned battery cell.

2. The X-ray analysis system according to claim 1, wherein, The aforementioned transmissive portion includes multiple point-like local transmissive portions.

3. The X-ray analysis system according to claim 1, wherein, The aforementioned transmission section has a wave-like shape.

4. The X-ray analysis system according to claim 1 or 2, wherein, The aforementioned sample holder has: The first constraint component, which is irradiated by the aforementioned X-rays, is provided with the aforementioned transmission part; The second restraint component is irradiated by the aforementioned X-rays that have passed through the first restraint component; and, A buffer component is disposed between the aforementioned first constraint component and the aforementioned battery cell; The aforementioned sample holder clamps and constrains the aforementioned battery cell from both surfaces through the aforementioned first constraint member and the second constraint member.

5. The X-ray analysis system according to claim 4, wherein, The aforementioned first constraint member has an X-ray irradiated portion that is irradiated by the aforementioned X-rays from the irradiation direction. The aforementioned first constraint component has: Thick-walled portion; and, The thin-walled portion is shorter than the thick-walled portion along the aforementioned irradiation direction; The aforementioned transmissive portion is located in the aforementioned thin-walled portion.

6. The X-ray analysis system according to claim 4, wherein, The aforementioned second constraint member has an additional transmission section for transmitting the aforementioned X-rays that have passed through the aforementioned transmission section. The aforementioned transmission portion is formed in the gap of the aforementioned first constraint member. The aforementioned additional transmission portion is a gap formed on the aforementioned second constraint member. The width of the aforementioned transmissive portion is smaller than the width of the aforementioned additional transmissive portion.

7. The X-ray analysis system according to claim 4, wherein, The aforementioned first constraint member has an X-ray irradiated portion that is irradiated by the aforementioned X-rays from the irradiation direction. The aforementioned second constraint member has an additional transmission section for transmitting the aforementioned X-rays that have passed through the aforementioned transmission section. The aforementioned additional transmission portion is a gap formed on the aforementioned second constraint member. When viewed along the aforementioned irradiation direction, the gap width formed on the aforementioned second constraint member increases as it moves away from the aforementioned first constraint member.

8. The X-ray analysis system according to claim 1 or 2, further comprising a detection device that detects the X-rays transmitted through the aforementioned sample holder to acquire X-ray analysis data. The aforementioned holding device switches the aforementioned irradiation position to multiple points, and the aforementioned charging and discharging device performs the same charging and discharging on the aforementioned battery cell in the same charging state and the same mode at each of the aforementioned multiple points. In this way, the aforementioned detection device detects the aforementioned X-rays transmitted through the aforementioned sample holder at each of the aforementioned multiple points and obtains the electrode state distribution during the charging and discharging process.

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