Electric storage device

Abstract

The power storage element includes an element case, a first two-dimensional identification code, and a second two-dimensional identification code. The element case is configured so as to be able to accommodate the electrode body. The first two-dimensional identification code is arranged on the outer surface of the element shell. The first two-dimensional identification code is configured so as to be able to read identification information. The second two-dimensional identification code is arranged on the outer surface of the element shell in a mode of being separated from the first two-dimensional identification code. The second two-dimensional identification code is configured so as to be able to read the same identification information as the first two-dimensional identification code. The second two-dimensional identification code is arranged at a position where at least a part of the first two-dimensional identification code cannot be visually confirmed when the second two-dimensional identification code is observed from the front side.

Description

Technical Field

[0001] The present disclosure relates to a power storage element. Background Art

[0002] A cylindrical battery having a two-dimensional code in which individual identification information is recorded and an auxiliary two-dimensional code in which the same individual identification information as that of the two-dimensional code is recorded is disclosed in Japanese Unexamined Patent Application Publication No. 2011-210663. The two-dimensional code is in a specific area on the side surface of the battery that has a first distance from the bottom of the battery and a second distance from the head of the battery. The auxiliary two-dimensional code is at a position having a third distance from the two-dimensional code within the specific area. Summary of the Utility Model

[0003] In the cylindrical battery described in Japanese Unexamined Patent Application Publication No. 2011-210663, the two two-dimensional codes are arranged in a relatively close manner within the specific area. Since the distances between the two two-dimensional codes become relatively close, a situation where both two-dimensional codes cannot be read easily occurs.

[0004] For example, in a state where the power storage element is mounted on a module, when one two-dimensional code is not exposed to the outside of the module, a situation where the other two-dimensional code is also not exposed to the outside easily occurs. In addition, when the module on which the power storage element is mounted is disassembled, etc., when one two-dimensional code of the power storage element is damaged, a situation where the other two-dimensional code is also damaged easily occurs.

[0005] The present disclosure has been completed in view of the above problems, and an object thereof is to provide a power storage element in which reading of identification information from a two-dimensional identification code is facilitated regardless of the state of the power storage element.

[0006] The power storage element based on the present disclosure includes an element housing, a first two-dimensional identification code, and a second two-dimensional identification code. The element housing is configured to be able to accommodate an electrode body. The first two-dimensional identification code is provided on the outer surface of the element housing. The first two-dimensional identification code is configured to be able to read identification information. The second two-dimensional identification code is provided on the outer surface of the element housing in a manner separated from the first two-dimensional identification code. The second two-dimensional identification code is configured to be able to read the same identification information as the first two-dimensional identification code. The second two-dimensional identification code is provided at a position where at least a part of the first two-dimensional identification code cannot be visually confirmed when the second two-dimensional identification code is viewed from the front.

[0007] According to the above structure, even from a direction in which the identification information cannot be read from the first two-dimensional identification code, the identification information can be read from the second two-dimensional identification code. Furthermore, reading of the identification information from the two-dimensional identification code is facilitated regardless of the state of the power storage element.

[0008] For example, in a state where a power storage element is mounted on a module, even if the first two-dimensional identification code is not exposed to the outside of the module, the second two-dimensional identification code may be exposed to the outside of the module. Therefore, it may be easier to read the identification information from the two-dimensional identification code. In addition, when disassembling the module on which the power storage element is mounted or the like, when the power storage element is damaged on the front side of the first two-dimensional identification code, the second two-dimensional identification code may also avoid damage. Therefore, it may be easier to read the identification information from the two-dimensional identification code regardless of the state of the power storage element.

[0009] According to the present disclosure, it is easier to read the identification information from the two-dimensional identification code regardless of the state of the power storage element. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Features, advantages, and technical and industrial significance of typical embodiments of the present utility model will be described below with reference to the accompanying drawings, in which the same reference numerals denote the same elements, wherein:

[0011] Figure 1 is a perspective view showing the power storage element according to Embodiment 1 from above;

[0012] Figure 2 is a perspective view showing the power storage element according to Embodiment 1 from below;

[0013] Figure 3A is a view showing the power storage element when the first two-dimensional identification code is observed from the front;

[0014] Figure 3B is a view showing the power storage element when the second two-dimensional identification code is observed from the front;

[0015] Figure 4 is a perspective view showing the power storage element according to a modification of Embodiment 1 from below;

[0016] Figure 5 is a perspective view showing the power storage element according to Embodiment 2;

[0017] Figure 6 is a perspective view showing the power storage element according to Embodiment 3. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Hereinafter, the power storage element according to each embodiment of the present disclosure will be described while referring to the attached Figure 1 drawings. The same or corresponding parts in the drawings are denoted by the same reference numerals, and the description thereof will not be repeated.

[0019] Embodiment 1

[0020] Figure 1 is a perspective view showing the power storage element according to Embodiment 1 from above.Figure 2 This is a perspective view showing the energy storage element according to the first embodiment from below.

[0021] like Figure 1 and Figure 2 As shown, the energy storage device 1 according to the first embodiment of the present disclosure is a so-called cylindrical battery. The energy storage device 1 includes a device case 10 , a first two-dimensional identification code 20 , and a second two-dimensional identification code 30 .

[0022] The element case 10 is configured to accommodate an electrode assembly. In this embodiment, the element case 10 houses an electrode assembly (not shown). The electrode assembly is composed of a plate assembly in which a positive electrode and a negative electrode are wound with a separator interposed therebetween. The element case 10 also houses an electrolyte (not shown).

[0023] The element case 10 includes an outer peripheral wall portion 11, a top surface portion 12, and a bottom surface portion 13. The outer peripheral wall portion 11 has a cylindrical outer shape. The material constituting the outer peripheral wall portion 11 is not particularly limited, but is formed of a conductive material such as aluminum, copper, or stainless steel.

[0024] The top surface portion 12 closes one end of the outer peripheral wall portion 11. The top surface portion 12 is located on one side of the electrode assembly housed in the element case 10 in the axial direction Z of the cylindrical outer peripheral wall portion 11.

[0025] The top surface portion 12 includes a top surface main body portion 121N, external terminals 121P, and an insulating member 122 .

[0026] The top surface main body 121N has a plate-like outer shape. The top surface main body 121N has a circular outer shape when viewed from the axial direction Z. The periphery of the top surface main body 121N is connected to the outer peripheral wall portion 11. In the present embodiment, the outer peripheral wall portion 11 and the top surface main body 121N are integrally formed as a single component. It should be noted that the outer peripheral wall portion 11 and the top surface main body 121N can also be formed by components independent of each other. In this case, the outer peripheral wall portion 11 and the top surface main body 121N can also be joined to each other by welding such as laser welding. A through hole 121Nh is formed in the approximate center of the top surface main body 121N, which passes through in the axial direction Z. The material constituting the top surface main body 121N is not particularly limited, but is formed of aluminum, copper, stainless steel, or the like.

[0027] The external terminal 121P has a circular outer shape when viewed from the axial direction Z. The external terminal 121P is located at the outermost end in one direction of the axial direction Z in the component housing 10. The external terminal 121P is located outside the top surface main body portion 121N in the axial direction Z. The external terminal 121P is located at the position covering the through hole of the top surface main body portion 121N. The external terminal 121P is electrically connected to either the positive electrode or the negative electrode of the electrode body housed in the component housing 10 via the through hole 121Nh. Specifically, the external terminal 121P is electrically connected to the positive electrode of the electrode body housed in the component housing 10 through the through hole 121Nh. The external terminal 121P is a positive terminal. At this time, the component housing 10 may further include a positive current collector plate. The external terminal 121P and the positive electrode of the electrode body may be electrically connected to each other via the positive current collector plate. The external terminal 121P is formed of aluminum, copper, stainless steel, or the like.

[0028] The insulating member 122 insulates the top surface main body portion 121N and the external terminal 121P. The insulating member 122 is disposed between the top surface main body portion 121N and the external terminal 121P.

[0029] The bottom surface portion 13 closes the other end of the outer peripheral wall portion 11. The bottom surface portion 13 is located on the other side of the electrode body housed in the component housing 10 in the axial direction Z.

[0030] The bottom surface portion 13 includes a bottom surface main body portion 131 and a sealing plug 132. The bottom surface main body portion 131 has a plate-like outer shape. The bottom surface main body portion 131 has a circular outer shape when viewed from the axial direction. The periphery of the bottom surface main body portion 131 is connected to the outer peripheral wall portion 11. The periphery of the bottom surface main body portion 131 and the outer peripheral wall portion 11 are joined by welding such as laser welding. The bottom surface main body portion 131 may also be fixedly connected to the outer peripheral wall portion 11 by tightening the outer peripheral wall portion 11. It should be noted that in the case where the top surface main body portion 121N and the outer peripheral wall portion 11 are formed of different members, the outer peripheral wall portion 11 and the bottom surface main body portion 131 may also be integrally formed as a single member. The material constituting the bottom surface main body portion 131 is not particularly limited, but is formed of a conductive material such as aluminum, copper, or stainless steel.

[0031] The bottom surface main body portion 131 is directly joined to the positive electrode or the negative electrode of the electrode body in the component housing 10 by welding from the outside of the component housing 10. Specifically, the bottom surface main body portion 131 is joined to the negative electrode. Thus, the bottom surface main body portion 131 is negatively charged. The bottom surface main body portion 131 can function as a negative terminal. In addition, the outer peripheral wall portion 11 joined to the bottom surface main body portion 131 is also negatively charged. The top surface main body portion 121N integrally formed with the outer peripheral wall portion 11 is also negatively charged. Thus, the top surface main body portion 121N can be connected to other energy storage elements or the like as a negative terminal.

[0032] The bottom surface main body portion 131 has an annular rib portion 131A, a plurality of radial rib portions 131B, a plurality of welding portions 131C, and a through hole 131D. The annular rib portion 131A extends annularly when viewed from the axial direction Z. The annular rib portion 131A protrudes toward the inner side of the element housing 10. The annular rib portion 131A contacts the negative electrode of the electrode body.

[0033] The plurality of radial rib portions 131B extend in the radial direction centered on the center of the bottom surface portion 13 when viewed from the axial direction. The plurality of radial rib portions 131B are arranged in a separated manner. The plurality of radial rib portions 131B are arranged at equal intervals in the circumferential direction. The plurality of radial rib portions 131B are connected to the annular rib portion 131A. The plurality of radial rib portions 131B protrude toward the inner side of the element housing 10. The plurality of radial rib portions 131B contact the negative electrode of the electrode body.

[0034] The plurality of welding portions 131C are portions in the bottom surface main body portion 131 that are joined to the negative electrode of the electrode body in the element housing 10 by welding. The plurality of welding portions 131C are formed by laser welding from the outside of the element housing 10. The plurality of welding portions 131C are formed in the annular rib portion 131A. In the annular rib portion 131A, the plurality of welding portions 131C are formed so as to extend along the circumferential direction centered on the center of the bottom surface portion 13 when viewed from the axial direction Z. The plurality of welding portions 131C are respectively formed in the plurality of radial rib portions 131B. In the radial rib portion 131B, the welding portion 131C is formed so as to extend along the radial direction. The annular rib portion 131A and the plurality of radial rib portions 131B may be thinner than other portions in the bottom surface main body portion 131. Thereby, the formation of the welding portion 131C becomes easy.

[0035] [[ID=⑨]]The through hole 131D is formed at the center of the bottom surface main body portion 131 when viewed from the axial direction Z. The through hole 131D can be used for injecting the electrolytic solution housed in the element housing 10.

[0036] The sealing plug 132 is inserted through the through hole 131D of the bottom surface main body portion 131. Thereby, the sealing plug 132 is fixed to the bottom surface main body portion 131. The through hole 131D and the sealing plug 132 can function as a pressure release valve for releasing the pressure inside the element housing 10 when the pressure inside the element housing 10 becomes excessively high.

[0037] The first two-dimensional identification code 20 is configured to be able to read identification information by a prescribed reader. The identification information includes, for example, the individual identification information of the storage battery element 1 provided with the first two-dimensional identification code 20. The individual identification information includes, for example, the manufacturing date, manufacturing time, manufacturing line, and lot number of the storage battery element 1. The first two-dimensional identification code 20 is, for example, a QR code (registered trademark).

[0038] The first two-dimensional identification code 20 is provided on the outer surface of the component housing 10. The first two-dimensional identification code 20 can be directly printed on the outer surface of the component housing 10 with ink or the like, or a label pre-printed with the first two-dimensional identification code 20 can be pasted on the outer surface of the component housing 10. The first two-dimensional identification code 20 can also be engraved on the component housing 10 by laser or the like. In the present embodiment, the first two-dimensional identification code 20 is provided on the outer peripheral wall portion 11.

[0039] The second two-dimensional identification code 30 is configured to be able to read the same identification information as the first two-dimensional identification code 20. At least a part of the identification information read by the second two-dimensional identification code 30 can be the same as the identification information read by the first two-dimensional identification code 20. The second two-dimensional identification code 30 is, for example, a QR code (registered trademark). The second two-dimensional identification code 30 is preferably the same as the first two-dimensional identification code 20.

[0040] The second two-dimensional identification code 30 is separated from the first two-dimensional identification code 20. The second two-dimensional identification code 30 is provided on the outer surface of the component housing 10. The second two-dimensional identification code 30 can be directly printed on the outer surface of the component housing 10 with ink or the like, or a label pre-printed with the second two-dimensional identification code 30 can be pasted on the outer surface of the component housing 10. The second two-dimensional identification code 30 can also be engraved on the component housing 10 by laser or the like.

[0041] In the present embodiment, the second two-dimensional identification code 30 is provided on the top surface portion 12. Specifically, the second two-dimensional identification code 30 is provided on the top surface main body portion 121N.

[0042] It should be noted that the positions of the first two-dimensional identification code 20 and the second two-dimensional identification code 30 may be opposite to each other. That is, it may also be that the first two-dimensional identification code 20 is provided on the top surface portion 12 and the second two-dimensional identification code 30 is provided on the outer peripheral wall portion 11.

[0043] Figure 3A is a view of the power storage element when observing the first two-dimensional identification code from the front. As Figure 3A shown, the first two-dimensional identification code 20 is provided at a position where at least a part of the second two-dimensional identification code 30 cannot be visually confirmed when observing the first two-dimensional identification code 20 from the front. Specifically, the first two-dimensional identification code 20 is provided at a position where the whole of the second two-dimensional identification code 30 cannot be visually confirmed when observing the first two-dimensional identification code 20 from the front. This is because the top surface main body portion 121N extends in the plane direction orthogonal to the axial direction Z of the outer peripheral wall portion 11.

[0044] It should be noted that in the present specification, the front of the two-dimensional identification code is a position on a certain imaginary straight line. The imaginary straight line is a normal line drawn at the central portion of the area where the two-dimensional identification code is provided on the outer surface of the component housing 10.

[0045] Figure 3B This is a view showing the power storage element when viewed from the front. As Figure 3B shown, the second two-dimensional identification code 30 is provided at a position where at least a part of the first two-dimensional identification code 20 cannot be visually confirmed when the second two-dimensional identification code 30 is viewed from the front. Specifically, the second two-dimensional identification code 30 is provided at a position where the whole of the first two-dimensional identification code 20 cannot be visually confirmed when the second two-dimensional identification code 30 is viewed from the front. This is because the outer peripheral surface of the outer peripheral wall portion 11 extends in a direction orthogonal to the plane direction in which the top surface main body portion 121N extends.

[0046] In addition, the second two-dimensional identification code 30 may also be provided on the bottom surface portion 13. Figure 4 This is a perspective view showing the power storage element according to the modified example of Embodiment 1 from below. As Figure 4 shown, in the power storage element 1a according to the modified example of Embodiment 1, the second two-dimensional identification code 30a is provided on the bottom surface portion 13. Specifically, the second two-dimensional identification code 30a is provided on the bottom surface main body portion 131. In this modified example, the positions of the first two-dimensional identification code 20 and the second two-dimensional identification code 30a may be opposite to each other. That is, the second two-dimensional identification code 30a may be provided on the outer peripheral wall portion 11, and the first two-dimensional identification code 20 may be provided on the bottom surface portion 13.

[0047] In this modified example, the first two-dimensional identification code 20 is also provided at a position where at least a part of the second two-dimensional identification code 30a cannot be visually confirmed when the first two-dimensional identification code 20 is viewed from the front. The second two-dimensional identification code 30a is provided at a position where at least a part of the first two-dimensional identification code 20 cannot be visually confirmed when the second two-dimensional identification code 30a is viewed from the front.

[0048] In addition, the power storage element 1 may also include three or more two-dimensional identification codes. For example, the third two-dimensional identification code can be arranged at the positions where the first two-dimensional identification code 20 and the second two-dimensional identification code 30 can be arranged in the present embodiment and the above-described modified examples.

[0049] As described above, the power storage element 1 according to Embodiment 1 of the present disclosure includes an element housing 10, a first two-dimensional identification code 20, and a second two-dimensional identification code 30. The element housing 10 is configured to be able to house an electrode body. The first two-dimensional identification code 20 is provided on the outer surface of the element housing 10. The first two-dimensional identification code 20 is configured to be able to read identification information. The second two-dimensional identification code 30 is provided on the outer surface of the element housing 10 so as to be separated from the first two-dimensional identification code 20. The second two-dimensional identification code 30 is configured to be able to read the same identification information as the first two-dimensional identification code 20. The second two-dimensional identification code 30 is provided at a position where at least a part of the first two-dimensional identification code 20 cannot be visually confirmed when the second two-dimensional identification code 30 is viewed from the front.

[0050] According to the above structure, even from a direction where the identification information cannot be read from the first two-dimensional identification code 20, the identification information can be read from the second two-dimensional identification code 30. Furthermore, the reading of the identification information from the two-dimensional identification code becomes easy regardless of the state of the power storage element 1.

[0051] For example, in a state where the power storage element 1 is mounted on a module, even if the first two-dimensional identification code 20 is not exposed to the outside of the module, the second two-dimensional identification code 30 may be exposed to the outside of the module. Therefore, the reading of the identification information from the two-dimensional identification code may become easy. In addition, when the module on which the power storage element 1 is mounted is disassembled, etc., when the power storage element 1 is damaged on the front side of the first two-dimensional identification code 20, the second two-dimensional identification code 30 may also avoid damage. Therefore, the reading of the identification information from the two-dimensional identification code may become easy regardless of the state of the power storage element 1.

[0052] Moreover, in Embodiment 1 of the present disclosure, the element housing 10 includes an outer peripheral wall portion 11, a top surface portion 12, and a bottom surface portion 13. The outer peripheral wall portion 11 is cylindrical. The top surface portion 12 closes one end of the outer peripheral wall portion 11. The bottom surface portion 13 closes the other end of the outer peripheral wall portion 11. One of the first two-dimensional identification code 20 and the second two-dimensional identification code 30 is provided on the outer peripheral wall portion 11. The other of the first two-dimensional identification code 20 and the second two-dimensional identification code 30 is provided on the top surface portion 12 or the bottom surface portion 13.

[0053] According to the above structure, even if the power storage element 1 has a so-called cylindrical shape, the reading of the identification information from the two-dimensional identification code becomes easy regardless of the state of the power storage element 1.

[0054] For example, in a state before the power storage element 1 is incorporated into the module, the identification information can be read from the two-dimensional identification code on the outer peripheral wall portion 11. On the other hand, there are cases where a plurality of power storage elements 1 are incorporated into the module and arranged in such a manner that the outer peripheral wall portions 11 of the respective power storage elements 1 face each other. In this case, the identification information can be read from the two-dimensional identification code on the top surface portion 12 or the bottom surface portion 13. Therefore, even if the power storage element has a so-called cylindrical shape, the reading of the identification information from the two-dimensional identification code becomes easy regardless of the state of the power storage element 1.

[0055] Embodiment 2

[0056] Hereinafter, the power storage element according to Embodiment 2 of the present disclosure will be described. In Embodiment 2 of the present disclosure, the position of the first two-dimensional identification code is different from that in Embodiment 1. It should be noted that the same structures and effects as those in Embodiment 1 will not be repeatedly described.

[0057] Figure 5 is a perspective view showing the power storage element according to Embodiment 2. As Figure 5 shown, in the power storage element 1x according to Embodiment 2 of the present disclosure, one of the first two-dimensional identification code 20x and the second two-dimensional identification code 30 is provided on the top surface portion 12. The other of the first two-dimensional identification code 20x and the second two-dimensional identification code 30 is provided on the bottom surface portion 13.

[0058] According to the above structure, even if the power storage element 1x has a so-called cylindrical shape, the reading of the identification information from the two-dimensional identification code becomes easy regardless of the state of the power storage element 1x.

[0059] For example, when one of the top surface main body portion 121N of the top surface portion 12 and the bottom surface main body portion 131 of the bottom surface portion 13 is connected to a bus bar or the like as a negative terminal, the identification information can be read from the two-dimensional identification code provided on the other of them. Therefore, even if the power storage element has a so-called cylindrical shape, the reading of the identification information from the two-dimensional identification code becomes easy.

[0060] In the present embodiment, specifically, the first two-dimensional identification code 20x is provided on the bottom surface portion 13, and the second two-dimensional identification code 30 is provided on the top surface portion 12. It should be noted that the positions of the first two-dimensional identification code 20x and the second two-dimensional identification code 30 may be opposite to each other. That is, it may be that the first two-dimensional identification code 20x is provided on the top surface portion 12 and the second two-dimensional identification code 30 is provided on the bottom surface portion 13.

[0061] The first two-dimensional identification code 20x and the second two-dimensional identification code 30 are not arranged in the axial direction Z. The first two-dimensional identification code 20x and the second two-dimensional identification code 30 may also be arranged in the axial direction Z.

[0062] Embodiment 3

[0063] Hereinafter, a power storage element according to Embodiment 3 of the present disclosure will be described. In Embodiment 3 of the present disclosure, the position of the second two-dimensional identification code is different from that in Embodiment 1. It should be noted that the same structures and effects as those in Embodiment 1 will not be repeatedly described.

[0064] Figure 6 is a perspective view showing the power storage element according to Embodiment 3. As Figure 6 shown, in the power storage element 1y according to Embodiment 3 of the present disclosure, the first two-dimensional identification code 20 is provided on the outer peripheral wall portion 11. The second two-dimensional identification code 30y is provided on the outer peripheral wall portion 11 so as to face in a direction opposite to the direction in which the first two-dimensional identification code 20 faces.

[0065] According to the above structure, even if the power storage element 1y has a so-called cylindrical shape, it becomes easy to read the identification information from the two-dimensional identification code regardless of the state of the power storage element 1y.

[0066] For example, when the power storage element 1y is damaged on the front side of the first two-dimensional identification code 20, the second two-dimensional identification code 30y facing in a direction opposite to the direction in which the first two-dimensional identification code 20 faces is also likely to avoid damage. Thus, it may become easy to read the identification information from the two-dimensional identification code regardless of the state of the power storage element 1y.

[0067] In the present embodiment, the first two-dimensional identification code 20 and the second two-dimensional identification code 30y are not arranged in the direction of a virtual plane orthogonal to the axial direction Z. The first two-dimensional identification code 20 and the second two-dimensional identification code 30y may also be arranged in the direction of a virtual plane orthogonal to the axial direction Z.

[0068] In the description of the above embodiments, structures that can be combined may also be combined with each other.

[0069] It should be considered that the embodiments disclosed this time are illustrative in all aspects and not restrictive. The scope of the present disclosure is represented not by the description of the above embodiments but by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

Claims

1. A power storage element, comprising: An element housing configured to accommodate an electrode body; A first two-dimensional identification code provided on an outer surface of the element housing and configured to be able to read identification information; and A second two-dimensional identification code provided on the outer surface of the element housing in a manner separated from the first two-dimensional identification code and configured to be able to read the same identification information as the first two-dimensional identification code, The second two-dimensional identification code is provided at a position where at least a part of the first two-dimensional identification code cannot be visually confirmed when the second two-dimensional identification code is viewed from the front.

2. The power storage element according to claim 1, wherein The element housing includes: A cylindrical outer peripheral wall portion; A top surface portion that closes one end of the outer peripheral wall portion; and A bottom surface portion that closes the other end of the outer peripheral wall portion, One of the first two-dimensional identification code and the second two-dimensional identification code is provided on the outer peripheral wall portion, The other of the first two-dimensional identification code and the second two-dimensional identification code is provided on the top surface portion or the bottom surface portion.

3. The power storage element according to claim 1, wherein The element housing includes: A cylindrical outer peripheral wall portion; A top surface portion that closes one end of the outer peripheral wall portion; and A bottom surface portion that closes the other end of the outer peripheral wall portion, One of the first two-dimensional identification code and the second two-dimensional identification code is provided on the top surface portion, The other of the first two-dimensional identification code and the second two-dimensional identification code is provided on the bottom surface portion.

4. The power storage element according to claim 1, wherein The element housing includes: A cylindrical outer peripheral wall portion; A top surface portion that closes one end of the outer peripheral wall portion; and A bottom surface portion that closes the other end of the outer peripheral wall portion, The first two-dimensional identification code is provided on the outer peripheral wall portion, The second two-dimensional identification code is provided on the outer peripheral wall portion in a direction opposite to the direction in which the first two-dimensional identification code faces.

Images