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 an electric storage element. Background Art

[0002] Japanese Patent Application Laid-Open No. 2011-210663 discloses a cylindrical battery having a two-dimensional code recording individual identification information and an auxiliary two-dimensional code recording 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 at 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 in the specific area at a third distance from the two-dimensional code. Summary of the invention

[0003] In the cylindrical battery described in Japanese Patent Application Laid-Open No. 2011-210663, two two-dimensional codes are arranged at a relatively close distance in a specific area. When the distance between the two two-dimensional codes becomes relatively close, it is easy to cause a situation where both two-dimensional codes cannot be read.

[0004] For example, when the storage element is mounted in a module, if one of the two-dimensional codes is not exposed to the outside of the module, the other two-dimensional code is likely to be not exposed to the outside. In addition, when the module with the storage element is disassembled, if one of the two-dimensional codes in the storage element is damaged, the other two-dimensional code is likely to be damaged.

[0005] The present disclosure has been made in view of the above-mentioned problems, and an object of the present disclosure is to provide an electric storage device that facilitates reading of identification information from a two-dimensional identification code regardless of the state of the electric storage device.

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

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

[0008] For example, when the storage element is mounted on the 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 is possible to easily read the identification information from the two-dimensional identification code. In addition, when the module equipped with the storage element is disassembled, when the storage element is damaged on the front side of the first two-dimensional identification code, the second two-dimensional identification code may avoid damage. Therefore, it is possible to easily read the identification information from the two-dimensional identification code regardless of the state of the storage element.

[0009] According to the present disclosure, it is easy to read identification information from a 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 exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like numerals represent like elements, and in which:

[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 diagram showing the power storage element when the first two-dimensional identification code is viewed from the front;

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

[0015] Figure 4 is a perspective view showing an electric storage element according to a modification of the first embodiment from below;

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

[0017] Figure 6 It is a perspective view showing an electric storage element according to the third embodiment. DETAILED DESCRIPTION

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

[0019] Implementation Method 1

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

[0021] like Figure 1 and Figure 2 As shown, the electric storage device 1 according to the first embodiment of the present disclosure is a so-called cylindrical battery. The electric 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 body. In the present embodiment, the element case 10 accommodates an electrode body (not shown). The electrode body is composed of an electrode plate group in which a positive electrode and a negative electrode are wound with a separator interposed therebetween. The element case 10 also accommodates 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 body 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, an external terminal 121P, and an insulating member 122 .

[0026] The top surface main body 121N has a plate-like shape. The top surface main body 121N has a circular shape when viewed from the axial direction Z. The periphery of the top surface main body 121N is connected to the peripheral wall portion 11. In the present embodiment, the peripheral wall portion 11 and the top surface main body 121N are integrally formed as a single component. It should be noted that the peripheral wall portion 11 and the top surface main body 121N may also be formed by components independent of each other. In this case, the peripheral wall portion 11 and the top surface main body 121N may 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 shape when viewed from the axial direction Z. The external terminal 121P is located at the end portion in one direction of the axial direction Z in the element housing 10. The external terminal 121P is located outside the top surface main body 121N in the axial direction Z. The external terminal 121P is located at the position of the through hole covering the top 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 element 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 element housing 10 via the through hole 121Nh. The external terminal 121P is a positive terminal. At this time, the element housing 10 may further include a positive electrode collector plate. The external terminal 121P and the positive electrode of the electrode body may be electrically connected to each other via the positive electrode 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 from 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 accommodated in the element case 10 in the axial direction Z.

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

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

[0032] The bottom body 131 includes an annular convex portion 131A, a plurality of radial convex portions 131B, a plurality of welding portions 131C, and a through hole 131D. The annular convex portion 131A extends in an annular shape when viewed from the axial direction Z. The annular convex portion 131A protrudes toward the inner side of the element case 10. The annular convex portion 131A contacts the negative electrode of the electrode body.

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

[0034] The plurality of welds 131C are portions of the bottom main body 131 that are joined to the negative electrode of the electrode body in the element case 10 by welding. The plurality of welds 131C are formed by laser welding from the outside of the element case 10. The plurality of welds 131C are formed in the annular ridge portion 131A. In the annular ridge portion 131A, the plurality of welds 131C are formed in a manner extending in the circumferential direction when the center of the bottom surface portion 13 is the center when viewed from the axial direction Z. The plurality of welds 131C are respectively formed in the plurality of radial ridge portions 131B. In the radial ridge portion 131B, the welds 131C are formed in a manner extending in the radial direction. The annular ridge portion 131A and the plurality of radial ridge portions 131B can be thinner than other portions in the bottom main body 131. Thus, the formation of the welds 131C becomes easy.

[0035] The through hole 131D is formed at the center of the bottom body portion 131 when viewed from the axial direction Z. The through hole 131D can be used to inject the electrolyte contained in the element case 10 .

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

[0037] The first two-dimensional identification code 20 is configured to be readable by a predetermined reader. The identification information includes, for example, individual identification information of the storage 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 batch number of the storage 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 by ink or the like, or a label pre-printed with the first two-dimensional identification code 20 can be attached to 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 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 portion 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). 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 set 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 by ink or the like, or a label pre-printed with the second two-dimensional identification code 30 can be attached to 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 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.

[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, the first two-dimensional identification code 20 may be provided on the top surface portion 12 , and the second two-dimensional identification code 30 may be provided on the peripheral wall portion 11 .

[0043] Figure 3A 2 is a diagram showing the storage element when the first two-dimensional identification code is viewed from the front. Figure 3A As shown, the first two-dimensional identification code 20 is provided at a position where at least a portion of the second two-dimensional identification code 30 cannot be visually confirmed when the first two-dimensional identification code 20 is observed 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 confirmed when the first two-dimensional identification code 20 is observed from the front. This is because the top surface main body 121N extends in a plane direction orthogonal to the axial direction Z of the outer peripheral wall portion 11.

[0044] It should be noted that in this specification, the front side of the two-dimensional identification code is a position on a certain imaginary straight line, which is a normal line drawn at the center of the region on the outer surface of the element case 10 where the two-dimensional identification code is provided.

[0045] Figure 3B 2 is a diagram showing the storage element when the second two-dimensional identification code is viewed from the front. Figure 3B As shown, the second two-dimensional identification code 30 is provided at a position where at least a portion of the first two-dimensional identification code 20 cannot be visually confirmed when the second two-dimensional identification code 30 is observed 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 confirmed when the second two-dimensional identification code 30 is observed 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 1 is a perspective view showing a storage element according to a modification of the first embodiment from below. Figure 4 As shown, in the storage element 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 position of the first two-dimensional identification code 20 and the position of 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 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 set at a position where at least a portion of the second two-dimensional identification code 30a cannot be visually confirmed when the first two-dimensional identification code 20 is observed from the front. The second two-dimensional identification code 30a is set at a position where at least a portion of the first two-dimensional identification code 20 cannot be visually confirmed when the second two-dimensional identification code 30a is observed from the front.

[0048] In addition, the power storage element 1 may include three or more two-dimensional identification codes. For example, the third two-dimensional identification code can be arranged at the 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-mentioned modification examples.

[0049] As described above, the storage element 1 involved in 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 accommodate 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 read identification information. The second two-dimensional identification code 30 is provided on the outer surface of the element housing 10 in a manner separated from the first two-dimensional identification code 20. The second two-dimensional identification code 30 is configured 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 portion of the first two-dimensional identification code 20 cannot be visually confirmed when the second two-dimensional identification code 30 is observed from the front.

[0050] According to the above configuration, identification information can be read from the second two-dimensional identification code 30 even from a direction in which identification information cannot be read from the first two-dimensional identification code 20. Furthermore, identification information can be easily read from the two-dimensional identification code regardless of the state of the power storage element 1.

[0051] For example, when the storage element 1 is mounted on the 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, it is possible to easily read the identification information from the two-dimensional identification code. In addition, when the module on which the storage element 1 is mounted is disassembled, if the 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 be prevented from being damaged. Therefore, it is possible to easily read the identification information from the two-dimensional identification code regardless of the state of the storage element 1.

[0052] Moreover, in the first embodiment of the present disclosure, the element housing 10 includes an outer peripheral wall portion 11, a top face portion 12, and a bottom face portion 13. The outer peripheral wall portion 11 is cylindrical. The top face portion 12 closes one end of the outer peripheral wall portion 11. The bottom face 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 face portion 12 or the bottom face portion 13.

[0053] According to the above configuration, even if the energy storage element 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 energy storage element 1 .

[0054] For example, in a state before the storage element 1 is incorporated into the module, identification information can be read from the two-dimensional identification code on the peripheral wall portion 11. On the other hand, there is a case where a plurality of storage elements 1 are incorporated into the module and arranged so that the peripheral walls 11 of the storage elements 1 face each other. In this case, 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 storage element 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 storage element 1.

[0055] Implementation Method 2

[0056] Hereinafter, the electric 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 configuration and effects as those in Embodiment 1 will not be described repeatedly.

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

[0058] According to the above-described configuration, even if the power storage element 1 x 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 element 1 x.

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

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

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

[0062] Implementation 3

[0063] Hereinafter, the 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 configuration and effects as those in Embodiment 1 will not be described repeatedly.

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

[0065] According to the above configuration, even if the power storage element 1 y 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 element 1 y.

[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 the direction opposite to the first two-dimensional identification code 20 is also easily free from damage. Therefore, it is possible to easily read the identification information from the two-dimensional identification code regardless of the state of the power storage element 1y.

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

[0068] In the description of the above-mentioned embodiments, it is also possible to combine the structures that can be combined with each other.

[0069] The embodiments disclosed this time should be considered as illustrative in all aspects and not restrictive. The scope of the present disclosure is indicated by the claims rather than the description of the embodiments described above, 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 the electrode body; A first two-dimensional identification code is disposed on the outer surface of the component housing and is configured to read identification information; and A second two-dimensional identification code is provided on the outer surface of the component housing in a manner separate from the first two-dimensional identification code, and 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 portion of the first two-dimensional identification code cannot be visually recognized when the second two-dimensional identification code is viewed from the front.

2. The electric storage element according to claim 1, The component housing comprises: A cylindrical outer peripheral wall portion; A top portion that closes one end of the peripheral wall portion; and The bottom portion 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 electric storage element according to claim 1, The component housing comprises: A cylindrical outer peripheral wall portion; A top portion that closes one end of the peripheral wall portion; and The bottom portion 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 set 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 electric storage element according to claim 1, The component housing comprises: A cylindrical outer peripheral wall portion; A top portion that closes one end of the peripheral wall portion; and The bottom portion closes the other end of the outer peripheral wall portion. The first two-dimensional identification code is arranged on the outer peripheral wall portion, The second two-dimensional identification code is provided on the outer peripheral wall portion so as to face a direction opposite to a direction in which the first two-dimensional identification code faces.

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