Power storage cell

Abstract

To facilitate reading identification information from a two-dimensional identification code regardless of a state of a power storage cell.SOLUTION: A power storage cell 1 includes a cell case 10, a first two-dimensional identification code 20, and a second two-dimensional code 30. The cell case 10 is configured to be able to store an electrode body. The first two-dimensional identification code 20 is provided on an outside surface of the cell case 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 outside surface of the cell case 10 separately 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 of preventing at least a portion of the first two-dimensional identification code 20 from being visually recognized when the second two-dimensional identification code 30 is seen from the front.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to an energy storage cell. [Background technology]

[0002] Patent Document 1 (JP Patent Publication 2011-210663 A) discloses a cylindrical battery equipped with a two-dimensional code bearing individual identification information and an auxiliary two-dimensional code bearing the same individual identification information as the two-dimensional code. The two-dimensional code is located in a specific area on the side of the battery that is 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 located at a third distance from the two-dimensional code in the specific area. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-210663 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the cylindrical battery described in Patent Document 1, the two two-dimensional codes are arranged so as to be relatively close to each other within a specific area. When the distance between the two two-dimensional codes becomes relatively close, it becomes easy for a situation to arise in which both two-dimensional codes cannot be read.

[0005] For example, when a storage cell is mounted on a module, a situation easily occurs in which when one two-dimensional code is not exposed to the outside of the module, the other two-dimensional code is also not exposed to the outside. Also, when dismantling a module in which a storage cell is mounted, a situation easily occurs in which when one two-dimensional code is damaged on the storage cell, the other two-dimensional code is also damaged.

[0006] The present disclosure has been made in consideration of the above problems, and has an object to provide a storage cell that makes it easy to read identification information from a two-dimensional identification code regardless of the state of the storage cell. [Means for solving the problem]

[0007] The energy storage cell according to the present disclosure includes a cell case, a first two-dimensional identification code, and a second two-dimensional identification code. The cell case is configured to accommodate an electrode body. The first two-dimensional identification code is provided on an outer surface of the cell case. 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 cell case at a distance 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 seen when the second two-dimensional identification code is viewed from the front.

[0008] According to the above configuration, it is possible to read the identification information from the second two-dimensional identification code even from a direction in which it is impossible to read the identification information from the first two-dimensional identification code, which in turn makes it easy to read the identification information from the two-dimensional identification code regardless of the state of the power storage cell.

[0009] For example, when the energy storage cell 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. This may facilitate reading of identification information from the two-dimensional identification code. Also, even if the energy storage cell is damaged on the front side of the first two-dimensional identification code, for example, when dismantling a module in which the energy storage cell is mounted, the second two-dimensional identification code may be prevented from being damaged. This may facilitate reading of identification information from the two-dimensional identification code regardless of the state of the energy storage cell. Effect of the Invention

[0010] According to the present disclosure, it becomes easy to read identification information from a two-dimensional identification code regardless of the state of the energy storage cell. [Brief description of the drawings]

[0011] [Figure 1] 1 is a perspective view showing a storage cell according to a first embodiment, viewed from above. [Diagram 2] 1 is a perspective view showing a storage cell according to a first embodiment, viewed from below. [Figure 3A] 1 is a diagram showing a storage cell when the first two-dimensional identification code is viewed from the front. FIG. [Figure 3B] 13 is a diagram showing a storage cell when the second two-dimensional identification code is viewed from the front. FIG. [Figure 4] 4 is a perspective view showing a storage cell according to a modified example of the first embodiment, viewed from below. FIG. [Diagram 5] FIG. 11 is a perspective view showing a storage cell according to a second embodiment. [Figure 6] FIG. 11 is a perspective view showing a storage cell according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, a storage cell according to each embodiment of the present disclosure will be described with reference to the drawings. The same or corresponding parts in the drawings are denoted by the same reference characters, and description thereof will not be repeated.

[0013] (Embodiment 1) Fig. 1 is a perspective view showing the power storage cell according to embodiment 1 from above, and Fig. 2 is a perspective view showing the power storage cell according to embodiment 1 from below.

[0014] 1 and 2, the storage cell 1 according to the first embodiment of the present disclosure is a so-called cylindrical battery. The storage cell 1 includes a cell case 10, a first two-dimensional identification code 20, and a second two-dimensional identification code 30.

[0015] The cell case 10 is configured to be able to accommodate an electrode assembly. In this embodiment, the cell case 10 accommodates the electrode assembly (not shown). The electrode assembly is composed of an electrode plate group in which a positive electrode and a negative electrode are wound with a separator interposed therebetween. The cell case 10 further accommodates an electrolyte (not shown).

[0016] The cell 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 it is formed of a conductive material such as aluminum, copper, or stainless steel.

[0017] 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 body accommodated in the cell case 10 in the axial direction Z of the cylindrical outer peripheral wall portion 11.

[0018] The top surface portion 12 has a top surface main body portion 121N, an external terminal 121P, and an insulating member 122.

[0019] 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 11. In this embodiment, the outer peripheral wall 11 and the top surface main body 121N are integrally formed as a single member. The outer peripheral wall 11 and the top surface main body 121N may be formed from different members. In this case, the outer peripheral wall 11 and the top surface main body 121N may be joined to each other by welding such as laser welding. A through hole 121Nh penetrating in the axial direction Z is formed at approximately the center of the top surface main body 121N. The material constituting the top surface main body 121N is not particularly limited, but it is formed from aluminum, copper, stainless steel, or the like.

[0020] The external terminal 121P has a circular outer shape when viewed from the axial direction Z. The external terminal 121P is located at the end of the cell case 10 in one direction of the axial direction Z. The external terminal 121P is located outside the top surface main body 121N in the axial direction Z. The external terminal 121P is located so as to cover the through hole of the top cover surface main body 121N. The external terminal 121P is electrically connected to either the positive electrode or the negative electrode of the electrode body housed in the cell case 10 through the through hole 121Nh. Specifically, the external terminal 121P is electrically connected to the positive electrode of the electrode body housed in the cell case 10 through the through hole 121Nh. The external terminal 121P is a positive electrode terminal. In this case, the cell case 10 may further include a positive electrode current collector. The external terminal 121P and the positive electrode of the electrode body may be electrically connected to each other through the positive electrode current collector. The external terminal 121P is made of aluminum, copper, stainless steel, or the like.

[0021] The insulating member 122 insulates the top surface main body portion 121N from the external terminals 121P. The insulating member 122 is disposed between the top surface main body portion 121N and the external terminals 121P.

[0022] 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 cell case 10 in the axial direction Z.

[0023] 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 bottom surface main body portion 131 is joined to the periphery of the outer peripheral wall portion 11 by welding such as laser welding. The bottom surface main body portion 131 may be fixedly connected to the outer peripheral wall portion 11 by crimping the outer peripheral wall portion 11. In addition, when the top surface main body portion 121N and the outer peripheral wall portion 11 are formed of different materials, the outer peripheral wall portion 11 and the bottom surface main body portion 131 may be integrally formed as a single member. The material constituting the bottom surface main body portion 131 is not particularly limited, but it is formed of a conductive material such as aluminum, copper, or stainless steel.

[0024] The bottom surface main body portion 131 is directly joined to the positive electrode or negative electrode of the electrode body in the cell case 10 by welding from the outside of the cell case 10. Specifically, the bottom surface main body portion 131 is joined to the negative electrode. As a result, the bottom surface main body portion 131 is negatively charged. The bottom surface main body portion 131 may function as a negative electrode 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 formed integrally with the outer peripheral wall portion 11 is also negatively charged. Therefore, the top surface main body portion 121N may be connected to another storage cell or the like as a negative electrode terminal.

[0025] The bottom surface main body portion 131 has an annular ridge portion 131A, a plurality of radial ridge portions 131B, a plurality of welded portions 131C, and a through hole 131D. The annular ridge portion 131A extends in an annular shape when viewed from the axial direction Z. The annular ridge portion 131A protrudes toward the inside of the cell case 10. The annular ridge portion 131A contacts the negative electrode of the electrode assembly.

[0026] The multiple radial ridges 131B extend in a radial direction centered on the center of the bottom surface portion 13 when viewed in the axial direction. The multiple radial ridges 131B are arranged so as to be spaced apart from each other. The multiple radial ridges 131B are arranged at equal intervals in the circumferential direction. The multiple radial ridges 131B are connected to the annular ridge 131A. The multiple radial ridges 131B protrude toward the inside of the cell case 10. The multiple radial ridges 131B are in contact with the negative electrode of the electrode body.

[0027] The welds 131C are portions of the bottom body 131 that are joined to the negative electrode of the electrode body in the cell case 10 by welding. The welds 131C are formed by laser welding from the outside of the cell case 10. The welds 131C are formed on the annular ridge 131A. In the annular ridge 131A, the welds 131C are formed to extend along the circumferential direction when the center of the bottom body 13 is the center as viewed from the axial direction Z. The welds 131C are formed on each of the radial ridges 131B. In the radial ridge 131B, the welds 131C are formed to extend along the radial direction. The annular ridge 131A and the radial ridges 131B may be thinner than other portions of the bottom body 131. This makes it easier to form the welds 131C.

[0028] The through hole 131D is formed in the center of the bottom main body portion 131 when viewed from the axial direction Z. The through hole 131D may be used for pouring the electrolyte solution contained in the cell case 10.

[0029] The sealing plug 132 is inserted into the through hole 131D of the bottom main body portion 131. This fixes the sealing plug 132 to the bottom main body portion 131. The through hole 131D and the sealing plug 132 may function as a pressure relief valve for releasing the pressure inside the case 20 when the pressure inside the cell case 10 becomes excessively high.

[0030] The first two-dimensional identification code 20 is configured so that the identification information can be read by a predetermined reader. The identification information includes, for example, individual identification information of the storage cell 1 on which the first two-dimensional identification code 20 is provided. The individual identification information includes, for example, the manufacturing date, manufacturing time, manufacturing line, and lot number of the storage cell 1. The first two-dimensional identification code 20 is, for example, a QR code (registered trademark).

[0031] The first two-dimensional identification code 20 is provided on the outer surface of the cell case 10. The first two-dimensional identification code 20 may be printed directly on the outer surface of the cell case 10 with ink or the like, or a label on which the first two-dimensional identification code 20 is pre-printed may be attached to the outer surface of the cell case 10. The first two-dimensional identification code 20 may be engraved on the cell case 10 with a laser or the like. In this embodiment, the first two-dimensional identification code 20 is provided on the outer peripheral wall portion 11.

[0032] 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 may 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). It is preferable that the second two-dimensional identification code 30 is the same as the first two-dimensional identification code 20.

[0033] 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 cell case 10. The second two-dimensional identification code 30 may be printed directly on the outer surface of the cell case 10 with ink or the like, or a label on which the second two-dimensional identification code 30 is pre-printed may be attached to the outer surface of the cell case 10. The second two-dimensional identification code 30 may be engraved on the cell case 10 with a laser or the like.

[0034] In this 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.

[0035] The positions of the first two-dimensional identification code 20 and the second two-dimensional identification code 30 may be reversed. That is, the first two-dimensional identification code 20 may be provided on the top surface 12, and the second two-dimensional identification code 30 may be provided on the outer circumferential wall 11.

[0036] 3A is a diagram showing the storage cell when the first two-dimensional identification code is viewed from the front. As shown in FIG. 3A, 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 recognized when the first two-dimensional identification code 20 is viewed from the front. Specifically, the first two-dimensional identification code 20 is provided at a position where the entire second two-dimensional identification code 30 cannot be visually recognized when the first two-dimensional identification code 20 is viewed from the front. This is because the top surface main body portion 121N extends in a planar direction perpendicular to the axial direction Z of the outer peripheral wall portion 11.

[0037] In this 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 center of the area on the outer surface of the cell casing 10 where the two-dimensional identification code is provided.

[0038] Fig. 3B is a diagram showing the storage cell when the second two-dimensional identification code is viewed from the front. As shown in Fig. 3B, 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 recognized 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 entire first two-dimensional identification code 20 cannot be visually recognized 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 perpendicular to the planar direction in which the top surface main body portion 121N extends.

[0039] The second two-dimensional identification code 30 may be provided on the bottom surface portion 13. FIG. 4 is a perspective view showing a storage cell according to a modification of the first embodiment from below. As shown in FIG. 4, in a storage cell 1a according to the modification of the first embodiment, 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 modification, the positions of the first two-dimensional identification code 20 and the second two-dimensional identification code 30a may be reversed. 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.

[0040] In this modification, 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 seen 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 seen when the second two-dimensional identification code 30a is viewed from the front.

[0041] The energy storage cell 1 may also have three or more two-dimensional identification codes. For example, the third two-dimensional identification code may be arranged at a position 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.

[0042] As described above, the energy storage cell 1 according to the first embodiment of the present disclosure includes a cell case 10, a first two-dimensional identification code 20, and a second two-dimensional identification code 30. The cell case 10 is configured to be able to accommodate an electrode body. The first two-dimensional identification code 20 is provided on the outer surface of the cell case 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 cell case 10 at a distance 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 such that at least a part of the first two-dimensional identification code 20 cannot be seen when the second two-dimensional identification code 30 is viewed from the front.

[0043] According to the above configuration, it is possible to read the identification information from the second two-dimensional identification code 30 even from a direction in which it is not possible to read the identification information from the first two-dimensional identification code 20. As a result, it becomes easy to read the identification information from the two-dimensional identification code regardless of the state of the energy storage cell 1.

[0044] For example, when the energy storage cell 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. This may make it easier to read the identification information from the two-dimensional identification code. Also, even if the energy storage cell 1 is damaged on the front side of the first two-dimensional identification code 20, for example, when dismantling a module in which the energy storage cell 1 is mounted, the second two-dimensional identification code 30 can avoid damage. This may make it easier to read the identification information from the two-dimensional identification code regardless of the state of the energy storage cell 1.

[0045] Further, in the first embodiment of the present disclosure, the cell 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 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.

[0046] According to the above configuration, even if the power storage cell 1 has a so-called cylindrical shape, it is easy to read the identification information from the two-dimensional identification code regardless of the state of the power storage cell 1.

[0047] For example, before the energy storage cell 1 is incorporated into a 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 energy storage cells 1 are incorporated into a module and the outer peripheral walls 11 of the energy storage cells 1 are arranged so as to face each other. In this case, it is possible to read the identification information from the two-dimensional identification code on the top surface portion 12 or the bottom surface portion 13. For this reason, even if the energy storage cell has a so-called cylindrical shape, it is easy to read the identification information from the two-dimensional identification code regardless of the state of the energy storage cell 1.

[0048] (Embodiment 2) Hereinafter, a storage cell according to a second embodiment of the present disclosure will be described. In the second embodiment of the present disclosure, the position of the first two-dimensional identification code is different from that in the first embodiment. Note that the description of the same configuration and effects as those in the first embodiment will not be repeated.

[0049] Fig. 5 is a perspective view showing a storage cell according to embodiment 2. As shown in Fig. 5, in a storage cell 1x according to embodiment 2 of the present disclosure, one of a first two-dimensional identification code 20x and a second two-dimensional identification code 30 is provided on a 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 a bottom surface portion 13.

[0050] According to the above configuration, even if the power storage cell 1x has a so-called cylindrical shape, it is easy to read the identification information from the two-dimensional identification code regardless of the state of the power storage cell 1x.

[0051] For example, when one of top surface main body portion 121N of top surface portion 12 and bottom surface main body portion 131 of bottom surface portion 13 is connected to a bus bar or the like as a negative terminal, it is possible to read the identification information from the two-dimensional identification code provided on the other of them. Therefore, even if the power storage cell has a so-called cylindrical shape, it is easy to read the identification information from the two-dimensional identification code.

[0052] In this embodiment, specifically, the first two-dimensional identification code 20x is provided on the bottom surface 13, and the second two-dimensional identification code 30 is provided on the top surface 12. The positions of the first two-dimensional identification code 20x and the second two-dimensional identification code 30 may be reversed. That is, the first two-dimensional identification code 20x may be provided on the top surface 12, and the second two-dimensional identification code 30 may be provided on the bottom surface 13.

[0053] The first two-dimensional identification code 20x and the second two-dimensional identification code 30 are not aligned in the axial direction Z. The first two-dimensional identification code 20x and the second two-dimensional identification code 30 may be aligned in the axial direction Z.

[0054] (Embodiment 3) Hereinafter, a storage cell according to a third embodiment of the present disclosure will be described. In the third embodiment of the present disclosure, the position of the second two-dimensional identification code is different from that in the first embodiment. Note that the description of the same configuration and effects as those in the first embodiment will not be repeated.

[0055] Fig. 6 is a perspective view showing a storage cell according to embodiment 3. As shown in Fig. 6, in a storage cell 1y according to embodiment 3 of the present disclosure, a first two-dimensional identification code 20 is provided on an outer circumferential wall portion 11. A second two-dimensional identification code 30y is provided on the outer circumferential wall portion 11 so as to face in the opposite direction to the direction in which the first two-dimensional identification code 20 faces.

[0056] According to the above configuration, even if the power storage cell 1y has a so-called cylindrical shape, it is easy to read the identification information from the two-dimensional identification code regardless of the state of the power storage cell 1y.

[0057] For example, even if the power storage cell 1y is damaged on the front side of the first two-dimensional identification code 20, the second two-dimensional identification code 30y, which faces in the opposite direction to the first two-dimensional identification code 20, is likely to avoid damage. Therefore, it may be easy to read the identification information from the two-dimensional identification code regardless of the state of the power storage cell 1y.

[0058] In this embodiment, the first two-dimensional identification code 20 and the second two-dimensional identification code 30y are not aligned in an imaginary plane direction perpendicular to the axial direction Z. The first two-dimensional identification code 20 and the second two-dimensional identification code 30y may be aligned in an imaginary plane direction perpendicular to the axial direction Z.

[0059] In the above description of the embodiments, configurations that can be combined may be combined with each other.

[0060] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present disclosure is defined by the claims, not by the description of the embodiments described above, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0061] 1, 1a, 1x, 1y storage cell, 10 cell case, 11 outer peripheral wall portion, 12 top surface portion, 121N top surface main body portion, 121P external terminal, 122 insulating member, 13 bottom surface portion, 131 bottom surface main body portion, 131A annular ridge portion, 131B radial ridge portion, 131C welded portion, 132 sealing plug, 20, 20x first two-dimensional identification code, 30, 30a, 30y second two-dimensional identification code.

Claims

1. A cell case configured to accommodate an electrode body; A first two-dimensional identification code provided on an outer surface of the cell case and configured to read identification information; a second two-dimensional identification code provided on an outer surface of the cell case at a distance from the first two-dimensional identification code and configured to be capable of reading the same identification information as the first two-dimensional identification code; A storage cell, wherein the second two-dimensional identification code is provided in a position such that at least a portion of the first two-dimensional identification code is not visible when the second two-dimensional identification code is viewed from the front.

2. The cell casing comprises: A cylindrical outer peripheral wall portion; A top surface portion that closes one end of the outer peripheral wall portion; a bottom surface portion closing 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 circumferential wall portion; The energy storage cell according to claim 1 , wherein 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 cell casing comprises: A cylindrical outer peripheral wall portion; A top surface portion that closes one end of the outer peripheral wall portion; a bottom surface portion closing 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 energy storage cell according to claim 1 , wherein 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 cell casing comprises: A cylindrical outer peripheral wall portion; A top surface portion that closes one end of the outer peripheral wall portion; a bottom surface portion closing the other end of the outer peripheral wall portion, the first two-dimensional identification code is provided on the outer peripheral wall portion, The energy storage cell according to claim 1 , wherein the second two-dimensional identification code is provided on the outer peripheral wall portion so as to face in a direction opposite to a direction in which the first two-dimensional identification code faces.

Images