JP2015130267A - Buttery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a buttery capable of preventing sealing failure.SOLUTION: The buttery includes; a housing; a wall; an output terminal; and a lid. The housing has a storing part for storing an electrode and electrolyte. The wall has an outer face formed on the housing facing the outside of the housing and an opening formed in the outer face communicating with the storing part. The output terminal protrudes from the outer face and is electrically connected to the electrode. The lid has a first part which is positioned being separated away from the outer face and covers the opening, and a second part which encloses the first part and is fixed to the wall at a position away from the opening.

Description

  Embodiments described herein relate generally to a battery.

  In a non-aqueous electrolyte secondary battery such as a lithium ion battery, a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, and a non-aqueous solvent electrolyte, for example, are accommodated in a container. The electrolytic solution is injected from a liquid injection port provided in the container. The liquid injection port is sealed by a sealing plate after the electrolyte is injected. The sealing plate is fixed to the container by welding, for example.

JP 2008-147069 A JP 2006-196394 A Japanese Patent Laid-Open No. 2007-066600 JP 2012-169254 A JP 2013-140682 A

  After the electrolytic solution is injected into the container, the air in the container is vented. For example, at this time, the electrolytic solution may blow out from the injection port and adhere to the vicinity of the injection port. If the sealing plate is welded to the container from the attached electrolyte or salt of the electrolyte, the container may be insufficiently sealed by the sealing plate.

  One of the problems to be solved by the present invention is to provide a battery that can suppress the occurrence of poor sealing.

  A battery according to one embodiment includes a housing, a wall, an output terminal, and a lid. The housing includes an accommodating portion that accommodates an electrode and an electrolytic solution. The wall is provided on the housing, and has an outer surface facing the outside of the housing, and an opening that is provided on the outer surface and communicates with the housing portion. The output terminal protrudes from the outer surface and is electrically connected to the electrode. The lid is located at a distance from the outer surface and covers the opening; and a second part that surrounds the first part and is fixed to the wall at a position away from the opening. Have.

FIG. 1 is a perspective view showing a battery according to the first embodiment. FIG. 2 is a cross-sectional view showing a part of the battery of the first embodiment. FIG. 3 is a cross-sectional view showing a part of the battery according to the second embodiment. FIG. 4 is a cross-sectional view showing a part of the battery according to the third embodiment. FIG. 5 is a cross-sectional view showing a part of the battery according to the fourth embodiment.

  The first embodiment will be described below with reference to FIGS. 1 and 2. In the present specification, basically, an upward direction as viewed from the user is defined as an upward direction, and a downward direction as viewed from the user is defined as a downward direction. In addition, a plurality of expressions may be written together for the constituent elements according to the embodiment and the description of the elements. It is not precluded that other expressions not described in the component and description are made. Furthermore, it is not prevented that other expressions are given for the components and descriptions in which a plurality of expressions are not described.

  FIG. 1 is a perspective view showing a battery 10 according to the first embodiment. The battery 10 is a lithium ion secondary battery, for example. The battery 10 is not limited to this, and may be another type of battery. As shown in FIG. 1, the battery 10 is formed in a substantially rectangular parallelepiped. The battery 10 may have other shapes.

  As shown in the drawings, in this specification, an X axis, a Y axis, and a Z axis are defined. The X axis, the Y axis, and the Z axis are orthogonal to each other. The X axis is along the width (length in the longitudinal direction) of the battery 10. The Y axis is along the thickness (length in the short direction) of the battery 10. The Z axis is along the height (length in the vertical direction) of the battery 10.

  The battery 10 includes a housing 21, an electrode group 22, two output terminals 23, a gas exhaust valve 24, and a sealing plate 25. The housing | casing 21 may also be called a container, a case, a can, a box, or a wall, for example. The electrode group 22 is an example of an electrode. The output terminal 23 may also be referred to as a positive electrode, a negative electrode, a terminal, a conductive part, or a protruding part, for example. The sealing plate 25 is an example of a lid, and may be referred to as a sealing body, a sealing plug, a sealing portion, a sealing portion, a covering portion, or a member, for example.

  The housing | casing 21 is formed with an aluminum alloy, for example. The housing 21 may be formed of other materials such as other metals or synthetic resins. The housing 21 includes a container 31 and a lid 32. The lid 32 is an example of a wall, and may be referred to as, for example, an outer wall, a sealing portion, a sealing portion, a covering portion, or a member.

  The container 31 is formed in a flat, substantially rectangular parallelepiped box shape. The upper end 31a of the container 31 is opened. In other words, an opening is provided at the upper end 31 a of the container 31. A container 34 is provided inside the container 31. The accommodating part 34 leads to the opened upper end 31a. In other words, the accommodating portion 34 is opened to the outside at the upper end 31 a of the container 31.

  The lid 32 is formed in a substantially rectangular plate shape and closes the opened upper end 31 a of the container 31. In other words, the lid 32 closes the opening provided in the upper end 31 a of the container 31. The lid 32 is, for example, laser welded to the upper end 31 a of the container 31 to seal the housing portion 34.

  FIG. 2 is a cross-sectional view showing a part of the battery 10. As shown in FIG. 2, the lid 32 has an outer surface 36 and an inner surface 37. The outer surface 36 faces the outside of the housing 21. In other words, the outer surface 36 faces the opposite side of the container 31 of the container 31. The output terminal 23, the gas discharge valve 24, and the sealing plate 25 are disposed on the outer surface 36 of the lid body 32. The inner surface 37 is located on the opposite side of the outer surface 36 and faces the accommodating portion 34.

  The electrode group 22 illustrated in FIG. 1 includes, for example, a plurality of positive electrodes, a plurality of negative electrodes, and a plurality of separators. The positive electrode and the negative electrode have, for example, a strip-shaped current collector and an active material layer formed on at least one surface of the current collector. The current collector is formed of a metal foil such as an aluminum foil, for example. For example, the separator is formed in a band shape from a porous material.

  The positive electrode, the negative electrode, and the separator are formed in a sheet shape. The positive electrode and the negative electrode are stacked via the separator and wound in a coil shape. The positive electrode, negative electrode, and separator wound in a cylindrical shape are pressed flat. The positive electrode, the negative electrode, and the separator may be laminated without being wound.

  The positive and negative electrode current collectors are provided with a plurality of tabs. The tab extends from the upper end of the electrode group 22. The plurality of tabs of the positive electrode are overlapped with each other. Similarly, the plurality of tabs of the negative electrode are overlapped with each other.

  The electrode group 22 is accommodated in the accommodating portion 34 of the container 31 together with the nonaqueous electrolytic solution. The nonaqueous electrolytic solution is an example of an electrolytic solution. The non-aqueous electrolyte is prepared, for example, by dissolving an electrolyte such as a lithium salt in a non-aqueous solvent.

  The two output terminals 23 are a positive terminal and a negative terminal of the battery 10, respectively. The two output terminals 23 are respectively arranged at one end and the other end of the outer surface 36 of the lid 32 in the direction along the X axis.

  The output terminal 23 is formed in a rivet shape. The output terminal 23 protrudes from the outer surface 36 of the lid body 32. A part of the output terminal 23 protrudes from the inner surface 37 through a hole provided in the lid 32. The part of the output terminal 23 protruding from the inner surface 37 is electrically connected to the tab of the electrode group 22 by a lead provided in the housing portion 34. A gasket 39 that is an insulator is interposed in the gap between the output terminal 23 and the lid 32. The hole of the lid 32 is sealed by the output terminal 23 and the gasket 39.

  The gas discharge valve 24 is located between the two output terminals 23. The gas discharge valve 24 is opened when, for example, the pressure inside the storage unit 34 becomes higher than a threshold value. The opened gas discharge valve 24 releases the gas in the housing part 34 to the outside of the housing 21 and reduces the pressure in the housing part 34.

  As shown in FIG. 2, a liquid injection port 41 is provided in the lid 32. The liquid injection port 41 is an example of an opening, and may be referred to as a hole or a recess, for example. The liquid injection port 41 is a circular hole provided in the outer surface 36 of the lid 32. The liquid injection port 41 may be formed in other shapes.

  The liquid injection port 41 passes through the lid 32 and communicates with the accommodating portion 34 of the container 31. In other words, the liquid injection port 41 is provided from the outer surface 36 to the inner surface 37 of the lid 32 and opens to the outer surface 36 and the inner surface 37, respectively.

  From the liquid injection port 41, the non-aqueous electrolyte is injected into the accommodating portion 34 in which the electrode group 22 is accommodated. Further, before the non-aqueous electrolyte is injected and after the non-aqueous electrolyte is injected, the air inside the accommodating portion 34 is removed from the liquid inlet 41 (defoaming).

  The lid 32 may be provided with other openings. In this case, the non-aqueous electrolyte is injected from the liquid injection port 41 into the accommodating portion 34, while the air in the accommodating portion 34 is discharged to the outside from the other opening.

  The lid body 32 has a protrusion 44. The protruding portion 44 may also be referred to as a weir, a dike, a surrounding portion, a wall, an attachment portion, or a fixing portion, for example. The protruding portion 44 is a part of the lid body 32 and protrudes from the outer surface 36. The protruding portion 44 is provided at a position away from the liquid injection port 41.

  The protruding portion 44 extends on the circumference around the liquid injection port 41. That is, the protrusion 44 surrounds the liquid injection port 41 at a position away from the liquid injection port 41. The distance between the liquid injection port 41 and the protrusion 44 is, for example, 1 μm to 10 mm. The distance between the liquid injection port 41 and the protruding portion 44 is not limited to this.

  The protrusion 44 divides the outer surface 36 of the lid 32 into a first area A1 and a second area A2. The first area A <b> 1 is an area outside the protruding portion 44. That is, the first region A1 surrounds the protrusion 44. The second region A <b> 2 is a region inside the protruding portion 44. That is, the second region A2 is surrounded by the protrusion 44. The output terminal 23 and the gas discharge valve 24 are disposed in the first region A1. The liquid injection port 41 is disposed in the second region A2.

  The height at which the protruding portion 44 protrudes from the outer surface 36 of the lid body 32 is, for example, 1 μm to 5 mm. In addition, the height of the protrusion part 44 is not restricted to this. The height is a distance along the Z axis between the outer surface 36 and the end 44 a of the protrusion 44. An end 44 a of the protruding portion 44 is a plane parallel to the outer surface 36. The end 44a of the protruding portion 44 is not limited to this.

  The sealing plate 25 is formed of, for example, an aluminum alloy as in the case 21. The sealing plate 25 may be formed of other materials such as other metals or synthetic resins. The sealing plate 25 is formed in a flat disk shape, for example.

  The sealing plate 25 has a first portion 51 and a second portion 52. The first portion 51 can also be referred to as a covering portion, a separation portion, or a lid portion, for example. The second portion 52 may also be referred to as a peripheral portion, a fixed portion, or a welded portion. In FIG. 2, the first portion 51 and the second portion 52 are separated by a two-dot chain line. The two-dot chain line is along the inner edge of the end 44 a of the protrusion 44.

  The first portion 51 covers the liquid injection port 41 through the space S. In other words, the first portion 51 is located away from the outer surface 36 of the lid 32 in the direction along the Z axis. The distance between the 1st part 51 and the outer surface 36 of the cover body 32 is equal to the height of the protrusion part 44, and is 1 micrometer-5 mm.

  The second portion 52 is a peripheral portion of the disc-shaped sealing plate 25 and is provided around the first portion 51. In other words, the second portion 52 is formed in an annular shape surrounding the first portion 51. For this reason, the second portion 52 is separated from the liquid injection port 41 in the direction along the X axis and the Y axis.

  The second portion 52 is supported by the end portion 44 a of the protruding portion 44. For this reason, the second portion 52 covers the end 44 a and the inner surface 44 b of the protrusion 44. The inner surface 44b is a side surface of the protruding portion 44 facing the liquid injection port 41 in the direction along the X axis and the Y axis. The inner surface 44 b extends obliquely with respect to the outer surface 36 of the lid body 32. The inner surface 44b may be orthogonal to the outer surface 36.

  The second portion 52 is fixed to the end portion 44a of the protruding portion 44 by, for example, laser welding. That is, the second portion 52 is fixed to the protruding portion 44 that is a part of the lid 32 at a position away from the liquid injection port 41. In FIG. 2, the welded portion W is indicated by a two-dot chain line.

  As described above, the second portion 52 is fixed to the end portion 44 a of the protruding portion 44. For this reason, the 1st part 51 which continues flatly from the 2nd part 52 covers 2nd area | region A2 of the outer surface 36 in which the liquid inlet 41 was provided through the space S. FIG. That is, the sealing plate 25 seals the liquid injection port 41 at a position floating from the second region A <b> 2 of the outer surface 36.

  In the battery 10 according to the first embodiment, the first portion 51 of the sealing plate 25 is located away from the outer surface 36 of the lid 32 and covers the liquid injection port 41. The second portion 52 of the sealing plate 25 surrounds the first portion 51 and is fixed to the lid 32 at a position away from the liquid injection port 41. That is, the sealing plate 25 forms a certain space around the liquid injection port 41, covers the liquid injection port 41, and is fixed to the lid body 32.

  As described above, the non-aqueous electrolyte is injected from the liquid injection port 41 into the accommodating portion 34 in which the electrode group 22 is accommodated. Further, after the non-aqueous electrolyte is injected, the air inside the accommodating portion 34 is extracted from the liquid injection port 41. At this time, the non-aqueous electrolyte may be ejected from the liquid injection port 41 together with air.

  The nonaqueous electrolytic solution overflowing from the liquid injection port 41 and a salt thereof (hereinafter referred to as an electrolytic solution or the like) E adhere to the upper end 41 a of the liquid injection port 41 or the outer surface 36 around the liquid injection port 41. The upper end 41 a is a portion of the liquid injection port 41 that opens to the outer surface 36. The electrolytic solution E or the like stays in the second region A2 of the outer surface 36 in the space around the liquid injection port 41.

  The second portion 52 of the sealing plate 25 is welded to the end portion 44a of the protruding portion 44 that is away from the second region A2. Thus, even if the electrolyte solution E or the like is attached around the liquid injection port 41, the sealing plate 25 is a portion that avoids the portion (second region A2) to which the electrolyte solution E or the like adheres, Fixed to the lid 32. In other words, the portion where the electrolytic solution E is attached and the portion where the sealing plate 25 is welded to the lid body 32 are physically separated.

  If the sealing plate 25 is welded to the lid body 32 from above the electrolyte E or the like, a pinhole is generated at the welded portion between the sealing plate 25 and the lid body 32, and the sealing performance of the battery 10 may be impaired. There is sex. Further, if the sealing plate 25 is welded to the lid body 32 in a state where the sealing plate 25 is lifted by the electrolytic solution E or the like, a gap may be generated between the sealing plate 25 and the lid body 32. According to the battery 10 of the first embodiment, it is possible to suppress the occurrence of such a sealing failure (welding failure). Thereby, the yield of the battery 10 improves.

  The protruding portion 44 protrudes from the outer surface 36 of the lid 32 and surrounds the liquid injection port 41 at a position away from the liquid injection port 41. For this reason, even if the electrolyte etc. E overflows from the liquid injection port 41, the electrolyte etc. E is formed in the protrusion 44 and the portion (second region A2) between the liquid injection port 41 and the protrusion 44. Will stay.

  The electrolytic solution E or the like that wants to fly further is received by the inner surface 44 b of the protruding portion 44 protruding from the outer surface 36. That is, the protruding portion 44 holds the electrolyte solution E or the like inside the protruding portion 44. In other words, the protruding portion 44 limits the range in which the electrolytic solution E or the like diffuses around the liquid injection port 41.

  Since the protruding portion 44 holds the electrolytic solution E or the like, the electrolytic solution or the like E is suppressed from adhering to the tip 44 a of the protruding portion 44. For this reason, the second portion 52 of the sealing plate 25 is welded to the end portion 44 a of the protruding portion 44 without the electrolyte solution E being interposed between the sealing plate 25 and the end portion 44 a of the protruding portion 44. The Thereby, it can suppress that the sealing defect arises between the sealing board 25 and the cover body 32. FIG.

  The sealing plate 25 is fixed to the protruding portion 44. For this reason, the position (projection part 44) which attaches the sealing plate 25 becomes clear, and positioning of the sealing plate 25 becomes easy. Thereby, the battery 10 can be manufactured more easily.

  The second embodiment will be described below with reference to FIG. In the following description of the plurality of embodiments, components having the same functions as the components already described are denoted by the same reference numerals as those described above, and further description may be omitted. . In addition, a plurality of components to which the same reference numerals are attached do not necessarily have the same functions and properties, and may have different functions and properties according to each embodiment.

  FIG. 3 is a cross-sectional view showing a part of the battery 10 according to the second embodiment. As shown in FIG. 3, the height of the protruding portion 44 in the second embodiment is higher than the height at which the output terminal 23 protrudes from the outer surface 36 of the lid 32. The height of the output terminal 23 is a length along the Z-axis from the outer surface 36 of the lid 32 to the end portion 23 a of the output terminal 23. The end 23 a of the output terminal 23 is a plane parallel to the outer surface 36. The end 23a of the output terminal 23 is not limited to this.

  According to the battery 10 of the second embodiment, the height of the protruding portion 44 is higher than the height of the output terminal 23. The conductive member M may fall on the lid 32 of such a battery 10. The member M is, for example, another battery having a conductive casing, a bus bar that electrically connects the plurality of batteries 10, or a screw.

  The height of the protruding portion 44 is higher than the height of the output terminal 23. For this reason, the protrusion part 44 receives the member M which falls. Further, the member M may hit one output terminal 23. However, since the protruding portion 44 that protrudes larger than the output terminal 23 supports the member M, the member M is prevented from contacting the two output terminals 23 at the same time. Therefore, the occurrence of a short circuit due to the conductive member M is suppressed.

  The third embodiment will be described below with reference to FIG. FIG. 4 is a cross-sectional view showing a part of the battery 10 according to the third embodiment. As shown in FIG. 4, the lid body 32 of the third embodiment does not have the protruding portion 44.

  The second portion 52 of the sealing plate 25 of the third embodiment is fixed to the outer surface 36 of the lid 32 by welding. The second portion 52 is welded to the outer surface 36 at a position separated from the liquid injection port 41 by, for example, 1 μm to 10 mm. The distance between the liquid injection port 41 and the second portion 52 is not limited to this.

  The first portion 51 is formed in a substantially dome shape that avoids the liquid injection port 41. The second portion 52 is a flange-shaped portion provided around the substantially dome-shaped first portion 51. The first portion 51 includes a covering wall 51a and an inclined wall 51b. The covering wall 51 can also be called a ceiling part, for example.

  The covering wall 51 a is disposed in parallel with the outer surface 36 of the lid body 32 with the space S therebetween. That is, the covering wall 51a covers a part of the outer surface 36 and the liquid injection port 41 at a position away from the outer surface 36 in the direction along the Z axis. The distance between the covering wall 51a and the outer surface 36 is, for example, 1 μm to 5 mm. The distance between the covering wall 51a and the outer surface 36 is not limited to this.

  The inclined wall 51 b surrounds the cover wall 51 a and is interposed between the cover wall 51 a and the second portion 52. The inclined wall 51b is formed in a substantially truncated cone shape. In other words, the inclined wall 51 b extends obliquely with respect to the outer surface 36.

  The shape of the first portion 51 is not limited to the above. For example, the first portion 51 may be formed in a cylindrical shape or a hemispherical shape. The first portion 51 covers the liquid injection port 41 and the outer surface 36 around the liquid injection port 41 from a remote position.

  According to the battery 10 of the third embodiment, the second portion 52 of the sealing plate 25 is fixed to the outer surface 36 of the lid 32 at a position away from the liquid injection port 41. On the other hand, the first portion 51 is located away from the outer surface 36 and covers the liquid injection port 41. That is, the sealing plate 25 covers the liquid injection port 41 by forming a certain space around the liquid injection port 41 and is fixed to the outer surface 36 of the lid 32.

  The liquid injection port 41 is separated from the portion to which the second portion 52 is welded. Even when the electrolyte etc. E overflows from the injection port 41, the electrolyte etc. E remains between the injection port 41 and the portion where the second portion 52 is welded. In other words, the second portion 52 is welded to the outer surface 36 of the lid 32 outside the region where the electrolytic solution E or the like will adhere. That is, a portion where the second portion 52 is welded to the lid body 32 and a portion where the electrolytic solution E adheres are separated.

  The second portion 52 is welded to the outer surface 36 of the lid 32 at a position away from the liquid injection port 41, thereby suppressing the presence of the electrolyte E or the like between the second portion 52 and the outer surface 36. Is done. Furthermore, since the first portion 51 is located away from the outer surface 36, the sealing plate 25 is suppressed from being lifted by the electrolytic solution E or the like attached to the outer surface 36. Thereby, poor welding between the sealing plate 25 and the lid 32 is suppressed.

  Hereinafter, a fourth embodiment will be described with reference to FIG. FIG. 5 is a cross-sectional view showing a part of the battery 10 according to the fourth embodiment. As shown in FIG. 5, the battery 10 of the fourth embodiment has a protruding portion 44 as in the first embodiment.

  The second area A2 of the outer surface 36 surrounded by the protrusion 44 is recessed more than the first area A1. In other words, the second area A2 is closer to the accommodating portion 34 than the first area A1. In other words, the distance along the Z axis from the first region A1 to the end 44a of the protruding portion 44 is the distance along the Z axis from the second region A2 to the end 44a of the protruding portion 44. Shorter than.

  The sealing plate 25 of the fourth embodiment is formed in a substantially dome shape as in the third embodiment. The second portion 52 surrounds the protruding portion 44 and is fixed to the outer surface 36 of the lid 32 by, for example, welding. In other words, the second portion 52 is farther from the liquid injection port 41 than the protruding portion 44.

  The covering wall 51a of the first portion 51 is separated from the end 44a of the protruding portion 44 in the direction along the Z axis. The covering wall 51 a covers the end portion 44 a and the inner surface 44 b of the protruding portion 44 and the second region A 2 of the outer surface 36 located inside the protruding portion 44.

  The inclined wall 51b of the first portion 51 is located outside the protruding portion 44 in the direction along the X axis and the Y axis. The inclined wall 51b may be partially located inside the protruding portion 44. The inclined wall 51b covers the outer surface 44c of the protruding portion 44 through a gap. The outer surface 44c is a side surface of the protruding portion 44 located on the opposite side of the inner surface 44b.

  As described above, the first portion 51 covers the protruding portion 44, the second region A <b> 2 of the outer surface 36 surrounded by the protruding portion 44, and the liquid injection port 41. The first portion 51 is separated from the protrusion 44. Note that the first portion 51 may contact the protruding portion 44. Furthermore, the first portion 51 may be fixed to the protruding portion 44 by, for example, welding.

  According to the battery 10 of the fourth embodiment, the first portion 51 of the sealing plate 25 covers the protruding portion 44. Further, the second portion 52 surrounds the protruding portion 44 and is fixed to the outer surface 36 of the lid body 32.

  The protrusion 44 limits the diffusion of the electrolyte solution E overflowing from the liquid injection port 41. Even if the electrolytic solution E adheres to the vicinity of the end portion 44 a of the projecting portion 44, the second portion 52 is fixed to the outer surface 36 outside the projecting portion 44. For this reason, it is suppressed that the 2nd part 52 is welded to the outer surface 36 in the state which electrolyte solution etc. intervened between the 2nd part 52 and the outer surface 36 of the cover body 32. FIG. Therefore, poor welding between the sealing plate 25 and the lid body 32 is suppressed.

  The first portion 51 covers the protrusion 44 at a position away from the protrusion 44. For this reason, even if the dimensions of the sealing plate 25 and / or the protruding portion 44 vary, the protruding portion 44 prevents the sealing plate 25 from floating. Furthermore, even if the electrolytic solution E or the like adheres to the end 44a or the outer surface 44c of the protruding portion 44, the sealing plate 25 is suppressed from being lifted by the electrolytic solution E or the like. Thereby, poor welding between the sealing plate 25 and the lid 32 is suppressed.

  The batteries according to the above embodiments are in the form of a battery pack having a single or a plurality of lithium ion secondary batteries, for example, a power source of a relatively small device such as a mobile phone, a personal computer, a portable music player, etc. In addition, it can also be used as a power source for relatively large devices such as electric bicycles, hybrid electric vehicles, and electric vehicles. The assembled battery is also used as a mobile power source such as a power source for automobiles and bicycles (moving bodies), for example, and as a stationary power source such as a power source for a POS (point of sales) system. Also used. Further, various devices can be mounted as a set in which a plurality of assembled batteries are connected in series or in parallel.

  A lithium ion secondary battery is a type of non-aqueous electrolyte secondary battery, and lithium ions in the electrolyte are responsible for electrical conduction. Examples of the positive electrode material include lithium manganese composite oxide, lithium nickel composite oxide, lithium cobalt composite oxide, lithium nickel cobalt composite oxide, lithium manganese cobalt composite oxide, spinel type lithium manganese nickel composite oxide, and olivine structure. As the negative electrode material, for example, an oxide-based material such as lithium titanate (LTO), a carbonaceous material, a silicon-based material, or the like is used. Further, as an electrolyte (for example, an electrolytic solution), for example, a lithium salt such as a fluorine-based complex salt (for example, LiBF4, LiPF6) is blended, for example, ethylene carbonate, propylene carbonate, diethyl carbonate, ethyl methyl carbonate, dimethyl carbonate. These organic solvents are used alone or in combination.

  According to at least one embodiment described above, the first portion of the lid is located away from the outer surface and covers the opening, and the second portion of the lid surrounds the first portion and from the opening. Fixed to the wall at a distance. Thereby, it can suppress that the sealing defect of a battery arises.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  For example, in the above embodiment, an example of the lid is the sealing plate 25. However, the lid is not limited to this and may be another member. Furthermore, an example of the opening is a liquid injection port 41. However, the opening is not limited to this and may be another part.

  Furthermore, in the above embodiment, the sealing plate 25 is fixed to the lid 32 by welding. However, the lid is not limited to this, and may be fixed to the wall by another method such as adhesion or welding.

  DESCRIPTION OF SYMBOLS 10 ... Battery, 21 ... Housing | casing, 22 ... Electrode group, 23 ... Output terminal, 25 ... Sealing board, 32 ... Lid body, 34 ... Storage part, 36 ... Outer surface, 41 ... Injection hole, 44 ... Projection part, 51 ... 1st part, 52 ... 2nd part, A1 ... 1st area | region, A2 ... 2nd area | region.

Claims (8)

A housing having an accommodating portion for accommodating an electrode and an electrolyte solution;
A wall provided on the housing and having an outer surface facing the outside of the housing; and an opening provided on the outer surface and leading to the housing portion;
An output terminal protruding from the outer surface and electrically connected to the electrode;
A lid having a first part located away from the outer surface and covering the opening; and a second part surrounding the first part and secured to the wall at a position away from the opening;
A battery comprising: The wall has a protrusion that protrudes from the outer surface and surrounds the opening at a position away from the opening;
The lid covers the protrusion;
The battery according to claim 1.   The battery of claim 2, wherein the second portion is fixed to the protrusion. The first portion covers the protrusion;
The second portion surrounds the protrusion and is fixed to the outer surface.
The battery according to claim 2.   The battery of claim 4, wherein the first portion is separated from the protrusion.   The battery according to claim 2, wherein the outer surface includes a first region surrounding the protrusion and a second region surrounded by the protrusion and recessed from the first region.   The battery according to claim 2, wherein a height at which the protruding portion protrudes from the outer surface is higher than a height at which the output terminal protrudes from the outer surface.   The battery of claim 1, wherein the second portion is fixed to the outer surface at a position away from the opening.

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