WO2018100846A1 - Secondary battery and device - Google Patents
Secondary battery and device Download PDFInfo
- Publication number
- WO2018100846A1 WO2018100846A1 PCT/JP2017/033556 JP2017033556W WO2018100846A1 WO 2018100846 A1 WO2018100846 A1 WO 2018100846A1 JP 2017033556 W JP2017033556 W JP 2017033556W WO 2018100846 A1 WO2018100846 A1 WO 2018100846A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- secondary battery
- substrate
- bent
- step portion
- battery according
- Prior art date
Links
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/105—Pouches or flexible bags
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a secondary battery and a device.
- a secondary battery generally has a structure in which an electrode assembly (electrode body) and an electrolyte are accommodated in an exterior body (case), and further includes an external terminal for achieving electrical connection of the secondary battery. ing.
- Patent Document 1 A secondary battery provided with a stepped portion has been reported as a secondary battery that meets such requirements.
- the secondary battery is generally used together with a substrate, for example, an electronic circuit substrate such as a printed circuit board, a semiconductor substrate such as a silicon wafer, and a glass substrate such as a display panel.
- a substrate for example, an electronic circuit substrate such as a printed circuit board, a semiconductor substrate such as a silicon wafer, and a glass substrate such as a display panel.
- the protection circuit board is often used in lithium ion secondary batteries for the purpose of preventing overcharge, overdischarge and overcurrent.
- the inventors of the present invention have a new problem that when a step portion is provided in a secondary battery and a substrate is disposed there, a positional shift occurs between the secondary battery and the substrate due to vibration or the like. I found out. Specifically, as shown in FIG. 7, in the secondary battery 500 having the stepped portion 501, if the substrate 600 is disposed on the lower stepped portion 510 having the upper surface 502 having a relatively low height, the mutual displacement due to vibration or the like. Therefore, there is a problem that the electrical connection between the secondary battery 500 and the substrate 600 is lost. There is also a problem that the secondary battery 500 and the substrate 600 damage each other.
- An object of the present invention is to provide a secondary battery that prevents mutual displacement of the substrate due to vibration or the like.
- the present invention An electrode assembly including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, and a secondary battery in which an electrolyte is enclosed in an exterior body,
- the secondary battery has at least one step portion constituted by two upper surfaces having different heights; A seal portion on at least one side surface of the low step portion having a relatively low height of the upper surface;
- the seal part can be bent in the thickness direction of the secondary battery,
- the present invention relates to a secondary battery in which a bent seal portion formed when the seal portion is bent serves as a stopper portion for a substrate disposed on an upper surface of the low step portion.
- the secondary battery of the present invention prevents mutual displacement of a substrate, particularly a substrate disposed in a lower step portion of the substrate, due to vibration or the like. As a result, the electrical connection between the secondary battery and the substrate can be maintained, and mutual damage between the secondary battery and the substrate can be prevented.
- the substrate can be disposed on the upper surface while preventing the displacement as described above, space saving of the substrate can be achieved, and the secondary battery and the substrate are disposed. Can increase the degree of freedom.
- FIG. 1 shows a schematic perspective view of a device including a secondary battery and a substrate according to a first embodiment of the present invention.
- FIG. 1B shows a schematic plan view of the device of FIG. 1A.
- FIG. FIG. 1B is a schematic plan view showing a state when the seal portion is bent in the device of FIG. 1A.
- 1C is a schematic enlarged cross-sectional view of the device when the PP section of the device of FIG. 1C is viewed in the direction of the arrow, and the bent seal portion directly serves as a stopper portion for the substrate disposed on the lower step portion. It is sectional drawing which shows the state of time.
- 1C is a schematic enlarged cross-sectional view of the device when the QQ cross section of the device of FIG.
- FIG. 1C is viewed in the direction of the arrow, and the bent seal portion directly serves as a stopper portion for the substrate disposed on the low step portion. It is sectional drawing which shows the state of time.
- FIG. 1C is a schematic enlarged cross-sectional view of the device when the PP cross section of the device of FIG. 1C is viewed in the direction of the arrow, and the bent seal portion indirectly becomes a stopper portion for the substrate disposed on the low step portion. It is sectional drawing which shows the state of time.
- 1C is a schematic enlarged cross-sectional view of the device when the QQ cross section of the device of FIG. 1C is viewed in the direction of the arrow, and the bent seal portion indirectly serves as a stopper portion for the substrate disposed on the low step portion.
- 1C is a schematic enlarged cross-sectional view of the device when the RR cross section of the device of FIG. 1C is viewed in the direction of the arrow. It is typical sectional drawing for demonstrating the folding shape of a bending seal part, and the height h1 of a bending seal part and the height h2 of a board
- FIG. 3B shows a schematic plan view of the device of FIG. 3A.
- FIG. 3B is a schematic plan view showing a state when the seal portion is bent in the device of FIG. 3A.
- FIG. 3C is a schematic enlarged cross-sectional view of the device when the PP cross section of the device of FIG. 3C is viewed in the direction of the arrow, and the bent seal portion is directly disposed on the low step portion (second step portion). It is sectional drawing which shows a state when it becomes a stopper part with respect to a board
- 3C is a schematic enlarged cross-sectional view of the device when the QQ cross section of the device of FIG. 3C is viewed in the direction of the arrow, and the folded seal portion is directly disposed on the low step portion (first step portion).
- FIG. 5B is a schematic plan view showing a state when the seal portion is bent in the device of FIG.
- FIG. 5B is a schematic enlarged cross-sectional view of the device when the PP cross section of the device of FIG. 5B is viewed in the direction of the arrow, and the bent seal portion directly serves as a stopper portion for the substrate disposed on the low step portion. It is sectional drawing which shows the state of time.
- FIG. 5B is a schematic enlarged cross-sectional view of the device when the RR cross-section of the device of FIG. 5B is viewed in the arrow direction.
- the typical perspective view of the device containing the secondary battery and substrate concerning a 4th embodiment of the present invention is shown.
- FIG. 6B is a schematic plan view showing a state when the seal portion is bent in the device of FIG. 6A.
- substrate which concern on a prior art is shown.
- the present invention provides a secondary battery.
- the term “secondary battery” refers to a battery that can be repeatedly charged and discharged.
- the “secondary battery” is not excessively bound by the name, and may include, for example, “electric storage device”.
- the shape of the secondary battery of the present invention is not particularly limited, and may be a shape having a stepped portion described below on the upper surface or a shape not having the stepped portion. From the viewpoint of practical usability, a shape having the step portion is preferable.
- the secondary battery of the present invention has a stepped portion
- the secondary battery of the present invention is not particularly limited in the shape of the secondary battery as long as the bent seal portion directly or indirectly becomes the stopper portion of the substrate, as will be described later. It is clear that is obtained.
- various elements in the drawings are merely schematically and exemplarily shown for understanding of the present invention, and the appearance and size ratio may be different from the actual ones.
- the “vertical direction”, “left / right direction”, and “front / back direction” used directly or indirectly in this specification correspond to directions corresponding to the vertical direction, left / right direction, and front / back direction in the drawing, respectively. Unless otherwise specified, the same symbols or symbols indicate the same members or the same meaning.
- FIGS. 1A and 1B An example of a secondary battery according to the first embodiment and a schematic perspective view and a schematic plan view of a device including a substrate are shown in FIGS. 1A and 1B.
- an electrode assembly and an electrolyte which will be described later, are enclosed in the exterior body 6, and the peripheral portions 91a to 91d hold the electrolyte and the like inside the exterior body 6 in plan view.
- the sealing part (sealing part) is formed.
- the plan view is a state when the secondary battery is placed and viewed from directly above in the thickness (height) direction, and is in agreement with the plan view.
- the mounting is, for example, mounting with the surface of the maximum area of the secondary battery as the bottom surface.
- the seal portion is provided at the peripheral portion of the exterior body in a plan view so as to seal the electrode assembly, electrolyte, and the like inside the exterior body from the outside.
- the seal portion is formed by joining the overlapping portions of the exterior body, and appears from the side surface of the secondary battery.
- the seal portion is formed by heat sealing.
- the seal portion does not necessarily have to be formed on all peripheral portions of the exterior body (secondary battery).
- the seal portion may not be formed at the peripheral portion.
- the secondary battery 100A of this embodiment has only one step portion 15 and includes a low step portion 10 having a relatively low top surface and a high step portion 20 having a relatively high top surface.
- the step portion 15 is formed by two upper surfaces 11 and 21 having different heights.
- the low step portion 10 has three side surfaces 10a, 10b, and 10c.
- the side surface is a side surface including the exterior body 6 exposed in a state before the seal portion is bent as shown in FIG. 1A.
- the side surface 10a is a surface facing the side surface 10c.
- the seal portion provided on at least one side surface of the low step portion 10 can be bent in the thickness direction of the secondary battery 100A, and in detail, is substantially parallel to the thickness direction. It can be bent. Since the exterior body 6 is composed of a soft sheet, the bent seal portion may be joined to a so-called main body portion of the secondary battery, as will be described later. The main body is used in a concept including the low stage 10 and the high stage 20 of the secondary battery. When the exterior body 6 is particularly formed of a plastic sheet, when the seal portion is folded in the thickness direction of the secondary battery 100A, the shape of the folded portion is maintained, so that the connection to the main body portion is not necessarily required.
- FIG. 1C is a schematic plan view showing a state when the seal portion is bent in the device of FIG. 1A.
- the bent seal portion 50 directly becomes a stopper portion for the substrate 60 ⁇ / b> A disposed on the low step portion 10, and at least the upper end portion (501) of the bent seal portion 50.
- the protruding portion 501 of the bent seal portion 50 serves as a stopper portion for the substrate 60A.
- the tip of the bent seal portion 50 protrudes higher than the height of the upper surface 11 of the low step portion.
- the bent seal portion 50 When the bent seal portion 50 does not protrude from the upper surface 11 of the low step portion 10, the bent seal portion 50 indirectly becomes a stopper portion for the substrate 60A arranged on the low step portion 10. As shown in FIGS. 1F and 1G, the bent seal portion 50 indirectly becomes a stopper portion for the substrate 60 ⁇ / b> A disposed on the low step portion 10, and the bent seal portion 50 is an extension member as a separate member.
- the extension member 500 is protruded from the upper surface 11 of the low step portion 10, and the protrusion 502 of the extension member 500 is a stopper portion for the substrate.
- the extension member 500 is a member that extends the bent seal portion 50 in the thickness direction of the secondary battery, and usually has a plate shape.
- any material can be used as long as the material has a strength that can prevent the displacement of the substrate, and examples thereof include organic polymers such as polyolefin, polyester, polyamide, polyurethane, and polyimide. It is done.
- the coupling means is not particularly limited as long as the coupling between the bent seal part 50 and the extending member 500 is achieved, and may be, for example, an adhesive or an adhesive tape.
- an adhesive 56 is used as a coupling means.
- 1F and FIG. 1G are schematic enlarged cross-sectional views of the device of FIG. 1C taken along the PP and QQ sections in the direction of the arrows, respectively, and the bent seal portion is indirectly low. It is sectional drawing which shows a state when it becomes a stopper part with respect to the board
- the bent seal portion 50 supports the extension member 500 as a separate member, so that the extension member 500 of the low step portion 10 is supported. You may make it protrude from the upper surface 11 (not shown).
- the protruding portions of both the extension member and the bent seal portion serve as stopper portions for the substrate, and the protruding portion of the extending member 500 reinforces the protruding portion of the bent seal portion, thereby improving the reliability of misalignment prevention. .
- the bending direction is a direction substantially parallel to the thickness direction of the secondary battery 100A, for example, the upward direction when the secondary battery is placed. Specifically, the bending direction is, for example, the right direction in FIGS. 1D and 1F and the upward direction in FIGS. 1E and 1G.
- the bent seal portion 50a prevents the upward displacement of the substrate 60A at the protruding portion 501 or 502.
- the bent seal portion 50b prevents the substrate 60A from being displaced in the right direction at the protruding portion 501 or 502.
- the bent seal portion 50c prevents the positional deviation of the substrate 60A in the downward direction at the protruding portion 501 or 502.
- the height h1 (mm) of the protrusions 501 and 502 is not particularly limited as long as the protrusion exerts a stopper action against the positional deviation of the substrate.
- the height h1 only needs to be higher than the height H of the upper surface 11 of the lower step portion on which the substrate is disposed.
- the height h1 is equal to the height h2 (mm) of the substrate 60A.
- the upper limit value of the height h1 is usually equal to or less than the maximum height h3 (mm) of the secondary battery 100A.
- FIG. 1H is a schematic enlarged cross-sectional view of the device when the RR cross-section of the device of FIG. 1C is viewed in the direction of the arrow.
- the bent seal portion 50 has a single bent shape that is simply bent once, but is not limited thereto. As shown in FIGS. 2A and 2B, it may have a folded shape formed by bending once or more after being bent once.
- the height h3 (mm) is shown in FIGS. 2A and 2B.
- FIG. 2A is a schematic cross-sectional view in the vicinity of the bent seal portion 50 when the bent seal portion 50, particularly the protrusions 501 and 502 exert a stopper action on the substrate.
- FIG. 2B is a schematic cross-sectional view of the vicinity of the bent seal portion when the end portion of the secondary battery has the bent seal portion 50.
- the seal portions (91a to 91c in FIG. 1B) on all the side surfaces are bent to form stopper portions.
- the present embodiment is not limited to this, and for example, any one of the side seal portions may be folded into a stopper portion, or any two side seal portions may be folded into the stopper. It may be a part. From the standpoint of further preventing misalignment, it is preferable that all of the seal portions on the three side surfaces are bent to form a stopper portion.
- the bent seal portion 50 may not be coupled to a so-called main body portion (a low-stage portion and a rear-stage portion) of the secondary battery.
- main body portion a low-stage portion and a rear-stage portion
- an adhesive 56 is used as a coupling means.
- the protrusions 501 and 502 of the bent seal portion 50 may or may not be coupled to the substrate 60A. However, from the viewpoint of further preventing misalignment, at least in part, for example, FIG. As shown in FIGS. 1E, 1F and 1G, it is preferably bonded to the substrate 60A. Also in these drawings, the adhesive 56 is used as a coupling means.
- the substrate 60A and the so-called main body part (low stage part and rear stage part) of the secondary battery may or may not be coupled to each other in part or all of the contact portions. From the standpoint of further preventing misalignment, it is preferable that at least a portion is coupled, for example, as shown in FIGS. 1E and 1G. Also in these drawings, the adhesive 56 is used as a coupling means.
- the surplus portions 95a and 95b (corner areas indicated by broken lines) generated when the seal portions 91a to 91c are bent may be cut as long as the sealing inside the exterior body is maintained, Alternatively, it may be folded and bonded (attached) to one of the bent seal portions 50.
- the secondary battery of this embodiment includes the secondary battery 100A of the first embodiment, and has one or more step portions in the secondary battery 100A of the first embodiment.
- the secondary battery has n step portions (n is a natural number of 1 or more)
- the secondary battery has (n + 1) upper surfaces with different heights.
- the first step portion, the second step portion, the third step portion,..., And the (n + 1) -th step portion are called in order from the lowest top surface.
- the secondary battery of this embodiment prevents misalignment with the substrate disposed on the upper surface of the first step portion (low step portion). That is, the seal portion on at least one of the three side surfaces of the first step portion can be bent.
- the bent seal portion formed when such a seal portion is bent serves as a stopper portion for the substrate disposed on the upper surface of the first step portion directly or indirectly, and as a result, misalignment is prevented.
- the seal portions on the three side surfaces of the first step portion form a bent seal portion, and the bent seal portion serves as a stopper portion for the substrate.
- the low step portion is selected from the group consisting of step portions other than the step portion having the highest top surface (that is, the first step portion to the n th step portion).
- the upper surface of the step portion on which the substrate to be prevented from being displaced is arranged on any of the first step portion to the n-th step portion.
- the upper surface of a step part may be sufficient.
- the step portion on which the substrate to be prevented from misalignment is arranged is the upper surface of the first step portion, similarly to the case where n is 1 in the present embodiment.
- the seal portion on at least one of the three side surfaces of the first step portion can be bent.
- the bent seal portion formed when such a seal portion is bent serves as a stopper portion for the substrate disposed on the upper surface of the first step portion directly or indirectly, and as a result, misalignment is prevented.
- the seal portions on the three side surfaces of the first step portion form a bent seal portion, and the bent seal portions on the three side surfaces serve as stopper portions for the substrate.
- the seal portion on at least one of the side surfaces (for example, two side surfaces) of the k-th step portion can be bent.
- the bent seal portion formed when such a seal portion is bent serves as a stopper portion for the substrate disposed directly or indirectly on the upper surface of the k-th step portion. That is, similarly to the mechanism in the first embodiment, the bent seal portion or the protruding portion of the extension member serves as a stopper portion of the substrate, and as a result, misalignment is prevented.
- the bent seal portion or the extending member is a stopper portion for the substrate. Also works.
- the height of the substrate disposed on the upper surface of the (k ⁇ 1) -th step portion is higher than the height of the upper surface of the k-th step portion, the displacement of the substrate disposed on the upper surface of the k-th step portion is further prevented.
- the height h1 (mm) of the protrusion and the height h2 (mm) of the substrate are substantially the same as the height h1 of the protrusion and the height h2 of the substrate in the first embodiment, respectively.
- the height h1 (mm) of the projecting portion only needs to be higher than the height H of the upper surface of the k-th step portion on which the substrate is arranged. From the viewpoint of further preventing positional displacement, the height h2 (mm) of the substrate is Therefore, it is preferable to satisfy the relational expression (1), and it is more preferable to satisfy the relational expression (2).
- the upper limit value of the height h1 is usually equal to or less than the maximum height h3 (mm) of the secondary battery.
- the secondary battery 100B of FIGS. 3A and 3B has the two step portions 15 and 25, and the upper surface of the step portion on which the substrate to be prevented from being displaced is the upper surface of the second step portion. Except this, it is the same as the secondary battery of FIGS. 1A and 1B.
- the side surfaces 20a and 20c have seal portions 91a and 91c, and these seal portions can be bent.
- the side surface 20a is a surface facing the side surface 20c.
- the bent seal portions 50a and 50c formed when these seal portions 91a and 91c are bent are arranged directly or indirectly on the upper surface of the second step portion. This is a stopper for the substrate 60B1.
- the protruding portions 501 of the bent seal portions 50a and 50c serve as a stopper portion of the substrate 60B1.
- each of the substrate 60B1 is prevented from being displaced upward and downward.
- the bent seal portions 50a and 50c (or the extension member (not shown)) are provided.
- the height of the substrate 60B2 of the first step portion 10 is lower than the height of the upper surface 21 of the second step portion 20, but the height of the substrate 60B2 of the first step portion 10 is higher than the upper surface 21 of the second step portion 20. If it is higher than this, the positional deviation of the substrate 60B1 of the second step portion 20 is further prevented.
- the height h1 (mm) of the protruding portion 501 and the height h2 (mm) of the substrate 60B1 are substantially the same as the height h1 of the protruding portion and the height h2 of the substrate in the first embodiment, respectively. This is the height from the bottom surface to the tip (upper end) of each member when the battery is placed with the maximum area of the secondary battery as the bottom surface.
- the height h1 (mm) of the protruding portion 501 may be higher than the height H of the upper surface of the second step portion on which the substrate is disposed. From the standpoint of further preventing positional displacement, the height h2 (mm) of the substrate. Therefore, the relational expression (1) is preferably satisfied, and the relational expression (2) is more preferably satisfied.
- FIG. 3C is a schematic plan view showing a state when the seal portion is bent in the device of FIG. 3A.
- 3D is a schematic enlarged cross-sectional view of the device when the PP cross section of the device of FIG. 3C is viewed in the direction of the arrow, and a stopper for the substrate in which the bent seal portion is directly disposed on the low step portion. It is sectional drawing which shows a state when it becomes a part.
- 3E is a schematic enlarged cross-sectional view of the device of FIG. 3C viewed from the QQ section in the direction of the arrow, and a stopper for the substrate in which the bent seal portion is directly disposed on the low step portion. It is sectional drawing which shows a state when it becomes a part.
- the secondary battery 100C of the present embodiment is the same as the secondary battery 100A of the first embodiment, except that both the upper exterior member 6a and the lower exterior member 6b are cup molded bodies.
- the secondary battery 100A of the first embodiment is a cup molded body in which only the upper exterior member 6a constituting the exterior body 6 has a thickness, but the secondary battery 100A of the third embodiment.
- the battery 100C is a cup in which both the upper exterior member 6a and the lower exterior member 6b have a thickness, depending on the thickness (height) of the electrode assembly housed in the secondary battery. It is a molded body.
- FIG. 5A is a schematic perspective view of a device including a secondary battery and a substrate according to the third embodiment.
- 5C and 5D are schematic enlarged cross-sectional views of the device when the PP cross-section and the RR cross-section of the device of FIG. 5B are viewed in the direction of the arrows, respectively.
- FIG. 5B is a schematic plan view showing a state when the seal portion is bent in the device of FIG. 5A.
- the seal portion on at least one side surface of the low step portion 10 can be bent in the thickness direction of the secondary battery 100C, and at least one derived from the seal portion.
- the bent seal portion 50 (including 50a to 50c) directly or indirectly becomes a stopper portion for the substrate 60C disposed on the upper surface 11 of the low step portion 10.
- FIG. 5C is a cross-sectional view showing a state where the bent seal portion directly becomes a stopper portion for the substrate disposed on the low step portion.
- the bent seal portion 50 When the bent seal portion 50 does not protrude from the upper surface 11 of the low step portion 10, as in the first embodiment, the bent seal portion 50 supports an extension member (not shown) as a separate member, The extension member may protrude from the upper surface 11 of the low step portion 10. The protruding portion of the extension member serves as a stopper portion for the substrate.
- the height h1 (mm) of the protruding portion, the height h2 (mm) of the substrate, and the maximum height h3 (mm) of the secondary battery are all the maximum of the secondary battery. This is the height from the bottom surface to the tip (upper end) of each member when placed with the surface of the area as the bottom surface, for example, the heights h1, h2, and h3 shown in FIGS. 5C and 5D.
- FIGS. 6A and 6B In the secondary battery 100D of this embodiment, as shown in FIGS. 6A and 6B, since the three sides of the low stage portion 10 are surrounded by the high stage portion 20, only one low stage portion 10 is exposed. Only the side surface 10d is provided, and the seal portion included in the one side surface 10d of the low step portion 10 is bent in the thickness direction of the secondary battery 100D, and the substrate 60D disposed on the upper surface 11 of the low step portion 10 The secondary battery is the same as the secondary battery 100A of the first embodiment except that it is a stopper portion.
- FIG. 6A is a schematic perspective view of a device including a secondary battery and a substrate according to the fourth embodiment.
- FIG. 6B is a schematic plan view showing a state when the seal portion is bent in the device of FIG. 6A.
- the seal portion 91d on only one side surface 10d of the low step portion 10 can be bent in the thickness direction of the secondary battery 100D, and is derived from the seal portion. Only one bent seal portion 50b that acts as a stopper portion for the substrate 60D disposed on the upper surface 11 of the low step portion 10 is directly or indirectly.
- the secondary battery of the present invention includes an embodiment in which the above embodiments are combined.
- all the upper surfaces are usually substantially parallel to the horizontal surface and have a planar shape
- the present invention is that the upper surface is inclined with respect to the horizontal surface and the upper surface is curved as long as the object of the present invention is achieved. It does not prevent having a shape.
- the electrode assembly includes a positive electrode 1, a negative electrode 2, and a separator 3, and the positive electrode 1 and the negative electrode 2 are alternately arranged via the separator 3.
- the two external terminals 5 are usually connected to electrodes (positive electrode or negative electrode) via current collecting leads, and as a result, are led out from the seal portion.
- the electrode assembly has a planar laminated structure in which a plurality of electrode units (electrode constituent layers) including a positive electrode 1, a negative electrode 2, and a separator 3 arranged between the positive electrode 1 and the negative electrode 2 are laminated in a planar shape. have.
- the structure of the electrode assembly is not limited to a planar laminated structure.
- an electrode unit (electrode constituent layer) including a positive electrode 1, a negative electrode 2, and a separator 3 disposed between the positive electrode 1 and the negative electrode 2 is wound in a roll shape.
- You may have a wound structure (jelly roll type).
- the electrode assembly may have a so-called stack and folding structure in which a positive electrode, a separator, and a negative electrode are stacked on a long film and then folded.
- the positive electrode 1 is composed of at least a positive electrode material layer and a positive electrode current collector (foil), and it is sufficient that the positive electrode material layer is provided on at least one surface of the positive electrode current collector.
- a positive electrode material layer may be provided on both surfaces of the positive electrode current collector, or a positive electrode material layer may be provided on one surface of the positive electrode current collector.
- the positive electrode 1 preferable from the viewpoint of further increasing the capacity of the secondary battery is provided with a positive electrode material layer on both surfaces of the positive electrode current collector.
- the positive electrode material layer contains a positive electrode active material.
- the negative electrode 2 is composed of at least a negative electrode material layer and a negative electrode current collector (foil), and it is sufficient that the negative electrode material layer is provided on at least one surface of the negative electrode current collector.
- the negative electrode material layer may be provided on both surfaces of the negative electrode current collector, or the negative electrode material layer may be provided on one surface of the negative electrode current collector.
- the negative electrode 2 is preferably provided with a negative electrode material layer on both surfaces of the negative electrode current collector.
- the negative electrode material layer contains a negative electrode active material.
- the positive electrode active material included in the positive electrode material layer and the negative electrode active material included in the negative electrode material layer are materials directly involved in the transfer of electrons in the secondary battery, and are the main materials of the positive and negative electrodes that are responsible for charge / discharge, that is, the battery reaction. is there. More specifically, ions are brought into the electrolyte due to the “positive electrode active material included in the positive electrode material layer” and the “negative electrode active material included in the negative electrode material layer”, and the ions are interposed between the positive electrode and the negative electrode. Then, the electrons are transferred and the electrons are delivered and charged and discharged. As will be described later, the positive electrode material layer and the negative electrode material layer are particularly preferably layers capable of occluding and releasing lithium ions.
- the secondary battery according to the present invention corresponds to a so-called “lithium ion battery”.
- the positive electrode active material of the positive electrode material layer is made of, for example, a granular material, and a binder (also referred to as a “binder”) is included in the positive electrode material layer for sufficient contact between the particles and shape retention. preferable. Furthermore, it is also preferable that a conductive additive is included in the positive electrode material layer in order to facilitate the transmission of electrons that promote the battery reaction.
- the negative electrode active material of the negative electrode material layer is made of, for example, a granular material, and it is preferable that a binder is included for sufficient contact and shape retention between the particles, and smooth transmission of electrons that promote the battery reaction. In order to do so, a conductive aid may be included in the negative electrode material layer.
- the positive electrode material layer and the negative electrode material layer can also be referred to as “positive electrode composite material layer” and “negative electrode composite material layer”, respectively.
- the positive electrode active material is preferably a material that contributes to occlusion and release of lithium ions.
- the positive electrode active material is preferably, for example, a lithium-containing composite oxide.
- the positive electrode active material is preferably a lithium transition metal composite oxide containing lithium and at least one transition metal selected from the group consisting of cobalt, nickel, manganese, and iron. That is, in the positive electrode material layer of the secondary battery according to the present invention, such a lithium transition metal composite oxide is preferably included as a positive electrode active material.
- the positive electrode active material may be lithium cobaltate, lithium nickelate, lithium manganate, lithium iron phosphate, or a part of those transition metals replaced with another metal. Although such a positive electrode active material may be included as a single species, two or more types may be included in combination.
- the positive electrode active material contained in the positive electrode material layer is lithium cobalt oxide.
- the binder that can be included in the positive electrode material layer is not particularly limited, but includes polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, vinylidene fluoride-tetrafluoroethylene copolymer, and Mention may be made of at least one selected from the group consisting of polytetrafluoroethylene and the like.
- the conductive auxiliary agent that can be included in the positive electrode material layer is not particularly limited, but carbon black such as thermal black, furnace black, channel black, ketjen black, and acetylene black, graphite, carbon nanotube, and vapor phase growth.
- the binder of the positive electrode material layer is polyvinylidene fluoride
- the conductive additive of the positive electrode material layer is carbon black.
- the binder and conductive additive of the positive electrode material layer are a combination of polyvinylidene fluoride and carbon black.
- the negative electrode active material is preferably a material that contributes to occlusion and release of lithium ions. From this point of view, the negative electrode active material is preferably, for example, various carbon materials, oxides, or lithium alloys.
- Examples of various carbon materials of the negative electrode active material include graphite (natural graphite, artificial graphite), hard carbon, soft carbon, diamond-like carbon, and the like.
- graphite is preferable in that it has high electron conductivity and excellent adhesion to the negative electrode current collector.
- Examples of the oxide of the negative electrode active material include at least one selected from the group consisting of silicon oxide, tin oxide, indium oxide, zinc oxide, lithium oxide, and the like.
- the lithium alloy of the negative electrode active material may be any metal that can be alloyed with lithium.
- Al, Si, Pb, Sn, In, Bi, Ag, Ba, Ca, Hg, Pd, Pt, Te, Zn It may be a binary, ternary or higher alloy of a metal such as La and lithium.
- a binary, ternary or higher alloy of a metal such as La and lithium.
- Such an oxide is preferably amorphous in its structural form. This is because deterioration due to non-uniformity such as crystal grain boundaries or defects is less likely to be caused.
- the negative electrode active material of the negative electrode material layer is artificial graphite.
- the binder that can be included in the negative electrode material layer is not particularly limited, but is at least one selected from the group consisting of styrene butadiene rubber, polyacrylic acid, polyvinylidene fluoride, polyimide resin, and polyamideimide resin. Can be mentioned.
- the binder contained in the negative electrode material layer is styrene butadiene rubber.
- the conductive aid that can be included in the negative electrode material layer is not particularly limited, but carbon black such as thermal black, furnace black, channel black, ketjen black, and acetylene black, graphite, carbon nanotube, and vapor phase growth.
- Examples thereof include at least one selected from carbon fibers such as carbon fibers, metal powders such as copper, nickel, aluminum and silver, and polyphenylene derivatives.
- the component resulting from the thickener component for example, carboxymethylcellulose used at the time of battery manufacture may be contained in the negative electrode material layer.
- the negative electrode active material and the binder in the negative electrode material layer are a combination of artificial graphite and styrene butadiene rubber.
- the positive electrode current collector and the negative electrode current collector used for the positive electrode and the negative electrode are members that contribute to collecting and supplying electrons generated in the active material due to the battery reaction.
- a current collector may be a sheet-like metal member and may have a porous or perforated form.
- the current collector may be a metal foil, a punching metal, a net or an expanded metal.
- the positive electrode current collector used for the positive electrode is preferably made of a metal foil containing at least one selected from the group consisting of aluminum, stainless steel, nickel and the like, and may be, for example, an aluminum foil.
- the negative electrode current collector used for the negative electrode is preferably made of a metal foil containing at least one selected from the group consisting of copper, stainless steel, nickel and the like, and may be, for example, a copper foil.
- the separator 3 is a member provided from the viewpoints of preventing a short circuit due to contact between the positive and negative electrodes and holding the electrolyte.
- the separator can be said to be a member that allows ions to pass while preventing electronic contact between the positive electrode and the negative electrode.
- the separator is a porous or microporous insulating member and has a film form due to its small thickness.
- a polyolefin microporous film may be used as the separator.
- the microporous membrane used as the separator may include, for example, only polyethylene (PE) or only polypropylene (PP) as the polyolefin.
- the separator may be a laminate composed of “a microporous membrane made of PE” and “a microporous membrane made of PP”.
- the surface of the separator may be covered with an inorganic particle coat layer and / or an adhesive layer.
- the surface of the separator may have adhesiveness.
- Electrolyte helps the movement of metal ions released from the electrodes (positive and negative electrodes).
- the electrolyte may be a “non-aqueous” electrolyte, such as an organic electrolyte and an organic solvent, or may be a “aqueous” electrolyte containing water.
- the secondary battery of the present invention is preferably a non-aqueous electrolyte secondary battery in which an electrolyte containing a “non-aqueous” solvent and a solute is used as an electrolyte.
- the electrolyte may have a form such as liquid or gel (in the present specification, “liquid” non-aqueous electrolyte is also referred to as “non-aqueous electrolyte solution”).
- a solvent containing at least carbonate is preferable.
- Such carbonates may be cyclic carbonates and / or chain carbonates.
- examples of the cyclic carbonates include at least one selected from the group consisting of propylene carbonate (PC), ethylene carbonate (EC), butylene carbonate (BC), and vinylene carbonate (VC). be able to.
- examples of the chain carbonates include at least one selected from the group consisting of dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), and dipropyl carbonate (DPC).
- non-aqueous electrolyte for example, a mixture of ethylene carbonate and diethyl carbonate.
- nonaqueous electrolyte solutes for example, Li salts such as LiPF 6 and LiBF 4 are preferably used.
- any current collecting lead used in the field of secondary batteries can be used.
- a current collecting lead may be made of a material capable of achieving electron movement, and is usually made of a conductive material such as aluminum, nickel, iron, copper, and stainless steel.
- the form of the current collecting lead is not particularly limited, and may be, for example, a linear shape or a plate shape.
- any external terminal used in the field of secondary batteries can be used.
- Such an external terminal may be made of a material capable of achieving electron movement, and is usually made of a conductive material such as aluminum, nickel, iron, copper, and stainless steel.
- the form of the external terminal 5 is not particularly limited, and is usually plate-shaped.
- the external terminal 5 may be electrically and directly connected to the substrate 60, or may be electrically and indirectly connected to the substrate 60 through another device.
- the current collecting lead can also be used as an external terminal.
- the exterior body 6 is a flexible pouch (soft bag) made of a soft sheet.
- the soft sheet only needs to have a degree of softness that can achieve bending of the seal portion, and is preferably a plastic sheet.
- the plastic sheet is a sheet having a characteristic that the deformation due to the external force is maintained when the external sheet is applied and then removed.
- a so-called laminate film can be used.
- a flexible pouch made of a laminate film can be produced, for example, by laminating two laminate films and heat-sealing the peripheral edge.
- As the laminate film a film obtained by laminating a metal foil and a polymer film is generally used.
- a film having a three-layer structure including an outer layer polymer film / metal foil / inner layer polymer film is exemplified.
- the outer layer polymer film is for preventing damage to the metal foil due to permeation and contact of moisture and the like, and polymers such as polyamide and polyester can be suitably used.
- the metal foil is for preventing the permeation of moisture and gas, and a foil of copper, aluminum, stainless steel or the like can be suitably used.
- the inner layer polymer film is for protecting the metal foil from the electrolyte accommodated therein, and for melting and sealing at the time of heat sealing, and polyolefin or acid-modified polyolefin can be suitably used.
- the thickness of the laminate film is not particularly limited, and is preferably 1 ⁇ m or more and 1 mm or less, for example.
- the substrate 60 may be a so-called rigid substrate or a flexible substrate.
- a rigid substrate is preferred. This is because when a rigid substrate is used, formation of a dead space and damage to the secondary battery due to the substrate are likely to be a problem, and even when a rigid substrate is used in the present invention, such a problem can be sufficiently avoided.
- the rigid substrate any rigid substrate used in the field of substrates used with secondary batteries can be used, and examples thereof include a glass / epoxy resin substrate.
- the substrate examples include an electronic circuit substrate such as a printed circuit board, a semiconductor substrate such as a silicon wafer, and a glass substrate such as a display panel.
- an electronic circuit substrate such as a printed circuit board
- a semiconductor substrate such as a silicon wafer
- a glass substrate such as a display panel.
- a secondary battery pack is constituted by the protection circuit board and the secondary battery.
- the secondary battery according to the present invention can be used in various fields where power storage is assumed.
- the secondary battery according to the present invention particularly the non-aqueous electrolyte secondary battery, is merely an example, and the electric / information / communication field (for example, a mobile phone, a smart phone, a smart watch, a laptop computer) in which a mobile device is used.
- mobile devices such as digital cameras
- home / small industrial applications eg, power tools, golf carts, home / care / industrial robots
- large industrial applications eg, forklifts, elevators, bay harbor cranes
- transportation system field for example, fields such as hybrid vehicles, electric vehicles, buses, trains, electric assist bicycles, electric motorcycles
- power system applications for example, various power generation, road conditioners, smart grids, general home-installed types
- Fields such as power storage systems
- space and deep sea applications for example, space) ⁇ , it can be used in the field
- diving research vessel such as diving research vessel.
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Abstract
The present invention provides a secondary battery that prevents mutual positional displacement due to vibration or the like with respect to a substrate, in particular, a substrate disposed on a low step portion formed by a step portion. The present invention pertains to a secondary battery 100A obtained by sealing, in an exterior body 6, an electrolyte and an electrode assembly including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, wherein the secondary battery has: one or more step portions 15 each formed by two upper surfaces 11, 21 having mutually different heights; and a sealing portion on at least one side surface of a low step portion 10 having a height of the upper surface that is relatively low. The sealing portion is bendable in the thickness direction of the secondary battery. A bent sealing portion 50b formed when said sealing portion is bent serves as a stopper portion with respect to a substrate 60A disposed on the upper surface 11 of the low step portion 10.
Description
本発明は二次電池およびデバイスに関する。
The present invention relates to a secondary battery and a device.
従来、種々の電子機器の電源として、二次電池が用いられている。二次電池は一般的に外装体（ケース）内に電極組立体（電極体）および電解質が収容された構造を有し、さらに二次電池の電気的接続を達成するための外部端子を具備している。
Conventionally, secondary batteries have been used as power sources for various electronic devices. A secondary battery generally has a structure in which an electrode assembly (electrode body) and an electrolyte are accommodated in an exterior body (case), and further includes an external terminal for achieving electrical connection of the secondary battery. ing.
近年、電子機器の薄型化および小型化が進んでおり、それに伴い、二次電池の薄型化および小型化への要求が高まっている。このような要求に応える二次電池として、段差部を設けた二次電池が報告されている（特許文献１）。
In recent years, electronic devices are becoming thinner and smaller, and accordingly, demands for thinner and smaller secondary batteries are increasing. A secondary battery provided with a stepped portion has been reported as a secondary battery that meets such requirements (Patent Document 1).
また二次電池は、基板、例えばプリント基板などの電子回路基板、シリコンウェハーなどの半導体基板、ディスプレイパネルなどのガラス基板とともに使用されるのが一般的である。特に保護回路基板は、リチウムイオン二次電池において、過充電、過放電および過電流の防止等を目的としてよく使用される。
Further, the secondary battery is generally used together with a substrate, for example, an electronic circuit substrate such as a printed circuit board, a semiconductor substrate such as a silicon wafer, and a glass substrate such as a display panel. In particular, the protection circuit board is often used in lithium ion secondary batteries for the purpose of preventing overcharge, overdischarge and overcurrent.
そこで、本発明の発明者等は、二次電池に段差部を設け、そこに基板を配置すると、二次電池と基板との間で、振動などによって、相互に位置ズレが生じるという新たな問題を見い出した。詳しくは図７に示すように、段差部５０１を有する二次電池５００において、高さが相対的に低い上面５０２を有する低段部５１０に基板６００を配置すると、振動などによって、相互に位置ズレするため、二次電池５００と基板６００との電気的接続が失われるという問題があった。また二次電池５００および基板６００が相互に損傷を与え合うという問題もあった。
Therefore, the inventors of the present invention have a new problem that when a step portion is provided in a secondary battery and a substrate is disposed there, a positional shift occurs between the secondary battery and the substrate due to vibration or the like. I found out. Specifically, as shown in FIG. 7, in the secondary battery 500 having the stepped portion 501, if the substrate 600 is disposed on the lower stepped portion 510 having the upper surface 502 having a relatively low height, the mutual displacement due to vibration or the like. Therefore, there is a problem that the electrical connection between the secondary battery 500 and the substrate 600 is lost. There is also a problem that the secondary battery 500 and the substrate 600 damage each other.
本発明は、基板との、振動などによる相互の位置ズレを防止する二次電池を提供することを目的とする。
An object of the present invention is to provide a secondary battery that prevents mutual displacement of the substrate due to vibration or the like.
本発明は特に、段差部により形成される低段部に配置される基板との、振動などによる相互の位置ズレを防止する二次電池を提供することを目的とする。
It is an object of the present invention to provide a secondary battery that prevents mutual displacement due to vibration or the like with a substrate disposed in a lower step portion formed by a step portion.
本発明は、
正極、負極および該正極と該負極との間に配置されたセパレータを含む電極組立体および電解質が外装体に封入された二次電池であって、
前記二次電池が互いに高さの異なる２つの上面により構成される段差部を１つ以上有し、
前記上面の高さが相対的に低い低段部の少なくとも１つの側面にシール部を有し、
該シール部が前記二次電池の厚み方向に折り曲げ可能となっており、
該シール部が折り曲げられたときに形成される折曲シール部が、前記低段部の上面に配置される基板に対するストッパー部となる、二次電池に関する。 The present invention
An electrode assembly including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, and a secondary battery in which an electrolyte is enclosed in an exterior body,
The secondary battery has at least one step portion constituted by two upper surfaces having different heights;
A seal portion on at least one side surface of the low step portion having a relatively low height of the upper surface;
The seal part can be bent in the thickness direction of the secondary battery,
The present invention relates to a secondary battery in which a bent seal portion formed when the seal portion is bent serves as a stopper portion for a substrate disposed on an upper surface of the low step portion.
正極、負極および該正極と該負極との間に配置されたセパレータを含む電極組立体および電解質が外装体に封入された二次電池であって、
前記二次電池が互いに高さの異なる２つの上面により構成される段差部を１つ以上有し、
前記上面の高さが相対的に低い低段部の少なくとも１つの側面にシール部を有し、
該シール部が前記二次電池の厚み方向に折り曲げ可能となっており、
該シール部が折り曲げられたときに形成される折曲シール部が、前記低段部の上面に配置される基板に対するストッパー部となる、二次電池に関する。 The present invention
An electrode assembly including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, and a secondary battery in which an electrolyte is enclosed in an exterior body,
The secondary battery has at least one step portion constituted by two upper surfaces having different heights;
A seal portion on at least one side surface of the low step portion having a relatively low height of the upper surface;
The seal part can be bent in the thickness direction of the secondary battery,
The present invention relates to a secondary battery in which a bent seal portion formed when the seal portion is bent serves as a stopper portion for a substrate disposed on an upper surface of the low step portion.
本発明の二次電池は、基板、特に基板の低段部に配置される基板との、振動などによる相互の位置ズレを防止する。その結果、二次電池と基板との電気的接続を維持することができ、また二次電池および基板の相互損傷を防止することができる。
本発明の二次電池は、上記のように位置ズレを防止しつつ、上面に基板を配置することができるので、基板の省スペース化を達成することができ、また二次電池および基板の配置の自由度を高めることができる。 The secondary battery of the present invention prevents mutual displacement of a substrate, particularly a substrate disposed in a lower step portion of the substrate, due to vibration or the like. As a result, the electrical connection between the secondary battery and the substrate can be maintained, and mutual damage between the secondary battery and the substrate can be prevented.
In the secondary battery of the present invention, since the substrate can be disposed on the upper surface while preventing the displacement as described above, space saving of the substrate can be achieved, and the secondary battery and the substrate are disposed. Can increase the degree of freedom.
本発明の二次電池は、上記のように位置ズレを防止しつつ、上面に基板を配置することができるので、基板の省スペース化を達成することができ、また二次電池および基板の配置の自由度を高めることができる。 The secondary battery of the present invention prevents mutual displacement of a substrate, particularly a substrate disposed in a lower step portion of the substrate, due to vibration or the like. As a result, the electrical connection between the secondary battery and the substrate can be maintained, and mutual damage between the secondary battery and the substrate can be prevented.
In the secondary battery of the present invention, since the substrate can be disposed on the upper surface while preventing the displacement as described above, space saving of the substrate can be achieved, and the secondary battery and the substrate are disposed. Can increase the degree of freedom.
［二次電池］
本発明は二次電池を提供する。本明細書中、「二次電池」という用語は充電および放電の繰り返しが可能な電池のことを指している。「二次電池」は、その名称に過度に拘泥されるものではなく、例えば、「蓄電デバイス」なども包含し得る。 [Secondary battery]
The present invention provides a secondary battery. In this specification, the term “secondary battery” refers to a battery that can be repeatedly charged and discharged. The “secondary battery” is not excessively bound by the name, and may include, for example, “electric storage device”.
本発明は二次電池を提供する。本明細書中、「二次電池」という用語は充電および放電の繰り返しが可能な電池のことを指している。「二次電池」は、その名称に過度に拘泥されるものではなく、例えば、「蓄電デバイス」なども包含し得る。 [Secondary battery]
The present invention provides a secondary battery. In this specification, the term “secondary battery” refers to a battery that can be repeatedly charged and discharged. The “secondary battery” is not excessively bound by the name, and may include, for example, “electric storage device”.
本発明の二次電池が有する形状は特に限定されず、上面に後述の段差部を有する形状であっても、または当該段差部を有さない形状であってもよいが、二次電池の分野における実際的な有用性の観点からは、当該段差部を有する形状が好ましい。
The shape of the secondary battery of the present invention is not particularly limited, and may be a shape having a stepped portion described below on the upper surface or a shape not having the stepped portion. From the viewpoint of practical usability, a shape having the step portion is preferable.
以下、本発明の二次電池が段差部を有する場合について、幾つかの実施態様を示す図面を用いて詳しく説明する。しかしながら、本発明の二次電池は、後述するように折曲シール部が直接的または間接的に基板のストッパー部となる限り、二次電池の形状は特に限定されることなく、本発明の効果が得られることは明らかである。本明細書中、図面における各種の要素は、本発明の理解のために模式的かつ例示的に示したにすぎず、外観および寸法比などは実物と異なり得る。本明細書で直接的または間接的に用いる“上下方向”、“左右方向”および“表裏方向”はそれぞれ、図中における上下方向、左右方向および表裏方向に対応した方向に相当する。特記しない限り、同じ符号または記号は、同じ部材または同じ意味内容を示すものとする。
Hereinafter, the case where the secondary battery of the present invention has a stepped portion will be described in detail with reference to the drawings showing some embodiments. However, the secondary battery of the present invention is not particularly limited in the shape of the secondary battery as long as the bent seal portion directly or indirectly becomes the stopper portion of the substrate, as will be described later. It is clear that is obtained. In the present specification, various elements in the drawings are merely schematically and exemplarily shown for understanding of the present invention, and the appearance and size ratio may be different from the actual ones. The “vertical direction”, “left / right direction”, and “front / back direction” used directly or indirectly in this specification correspond to directions corresponding to the vertical direction, left / right direction, and front / back direction in the drawing, respectively. Unless otherwise specified, the same symbols or symbols indicate the same members or the same meaning.
（第１実施態様）
第１実施態様に係る二次電池の一例と基板を含むデバイスの模式的斜視図および模式的平面図をそれ図１Ａおよび図１Ｂに示す。本実施態様の二次電池１００Ａは、後述する電極組立体および電解質が外装体６に封入されており、平面視においてその周縁部９１ａ～９１ｄには、外装体６内部に電解質等を保持するためのシール部（封止部）が形成されている。平面視とは、二次電池を載置してその厚み（高さ）方向の真上から見たときの状態のことであり、平面図と同意である。載置は、例えば二次電池の最大面積の面を底面にした載置である。 (First embodiment)
An example of a secondary battery according to the first embodiment and a schematic perspective view and a schematic plan view of a device including a substrate are shown in FIGS. 1A and 1B. In thesecondary battery 100A of the present embodiment, an electrode assembly and an electrolyte, which will be described later, are enclosed in the exterior body 6, and the peripheral portions 91a to 91d hold the electrolyte and the like inside the exterior body 6 in plan view. The sealing part (sealing part) is formed. The plan view is a state when the secondary battery is placed and viewed from directly above in the thickness (height) direction, and is in agreement with the plan view. The mounting is, for example, mounting with the surface of the maximum area of the secondary battery as the bottom surface.
第１実施態様に係る二次電池の一例と基板を含むデバイスの模式的斜視図および模式的平面図をそれ図１Ａおよび図１Ｂに示す。本実施態様の二次電池１００Ａは、後述する電極組立体および電解質が外装体６に封入されており、平面視においてその周縁部９１ａ～９１ｄには、外装体６内部に電解質等を保持するためのシール部（封止部）が形成されている。平面視とは、二次電池を載置してその厚み（高さ）方向の真上から見たときの状態のことであり、平面図と同意である。載置は、例えば二次電池の最大面積の面を底面にした載置である。 (First embodiment)
An example of a secondary battery according to the first embodiment and a schematic perspective view and a schematic plan view of a device including a substrate are shown in FIGS. 1A and 1B. In the
シール部は、外装体内部の電極組立体および電解質等を外界から封止すべく、平面視における外装体の周縁部に設けられるものである。シール部は外装体の重ね合わせ部分を結合することにより形成され、二次電池の側面から現出する。外装体が例えば、後述のラミネートフィルムから形成される場合、シール部はヒートシールにより形成される。シール部は外装体内部に電解質等が保持される限り、必ずしも外装体（二次電池）の全ての周縁部に形成されなければならないというわけではない。例えば、外装体がラミネートフィルムから形成され、かつ当該ラミネートフィルムを周縁部で折り返して連続的に用いる場合には当該周縁部でシール部は形成されなくてもよい。
The seal portion is provided at the peripheral portion of the exterior body in a plan view so as to seal the electrode assembly, electrolyte, and the like inside the exterior body from the outside. The seal portion is formed by joining the overlapping portions of the exterior body, and appears from the side surface of the secondary battery. For example, when the exterior body is formed from a laminate film described later, the seal portion is formed by heat sealing. As long as an electrolyte or the like is held inside the exterior body, the seal portion does not necessarily have to be formed on all peripheral portions of the exterior body (secondary battery). For example, when the exterior body is formed from a laminate film and the laminate film is continuously used by being folded at the peripheral portion, the seal portion may not be formed at the peripheral portion.
本実施態様の二次電池１００Ａは段差部１５を１つのみ有し、上面の高さが相対的に低い低段部１０および上面の高さが相対的に高い高段部２０を含む。段差部１５は互いに高さの異なる２つの上面１１、２１により形成されている。
The secondary battery 100A of this embodiment has only one step portion 15 and includes a low step portion 10 having a relatively low top surface and a high step portion 20 having a relatively high top surface. The step portion 15 is formed by two upper surfaces 11 and 21 having different heights.
本実施態様において、低段部１０は３つの側面１０ａ、１０ｂおよび１０ｃを有している。側面とは、図１Ａに示すようなシール部の折り曲げ前の状態において露出している外装体６からなる側面のことである。側面１０ａは側面１０ｃと対向する面である。
In this embodiment, the low step portion 10 has three side surfaces 10a, 10b, and 10c. The side surface is a side surface including the exterior body 6 exposed in a state before the seal portion is bent as shown in FIG. 1A. The side surface 10a is a surface facing the side surface 10c.
本実施態様の二次電池１００Ａは、低段部１０の少なくとも１つの側面に有するシール部が当該二次電池１００Ａの厚み方向に折り曲げ可能となっており、詳しくは当該厚み方向に略平行になるように折り曲げ可能である。外装体６は軟質シートから構成されるので、後述するように、折り曲げられたシール部は二次電池のいわゆる本体部に結合すればよい。本体部は二次電池の低段部１０および高段部２０を含む概念で用いるものとする。外装体６が特に可塑性シートから構成される場合、シール部が二次電池１００Ａの厚み方向に折り曲げられると、折り曲げられたままの形状を維持するので、本体部への結合は必ずしも要さない。これらの結果、シール部９１ａ～９１ｃが図１Ｃに示すように折り曲げられたときに形成される折曲シール部５０（５０ａ～５０ｃを包含する）（以下、「折曲シール部」ということがある）は直接的または間接的に、低段部１０の上面１１に配置される基板６０Ａに対するストッパー部となる。すなわち、折曲シール部５０は基板６０Ａの移動を制限し、ストッパー作用を発揮する。図１Ｃは図１Ａのデバイスにおいてシール部を折り曲げたときの状態を示す模式的平面図を示す。
In the secondary battery 100A of the present embodiment, the seal portion provided on at least one side surface of the low step portion 10 can be bent in the thickness direction of the secondary battery 100A, and in detail, is substantially parallel to the thickness direction. It can be bent. Since the exterior body 6 is composed of a soft sheet, the bent seal portion may be joined to a so-called main body portion of the secondary battery, as will be described later. The main body is used in a concept including the low stage 10 and the high stage 20 of the secondary battery. When the exterior body 6 is particularly formed of a plastic sheet, when the seal portion is folded in the thickness direction of the secondary battery 100A, the shape of the folded portion is maintained, so that the connection to the main body portion is not necessarily required. As a result, the bent seal portions 50 (including 50a to 50c) formed when the seal portions 91a to 91c are bent as shown in FIG. 1C (hereinafter, referred to as “folded seal portions”). ) Directly or indirectly serves as a stopper portion for the substrate 60 </ b> A disposed on the upper surface 11 of the low step portion 10. That is, the bent seal portion 50 restricts the movement of the substrate 60A and exhibits a stopper action. FIG. 1C is a schematic plan view showing a state when the seal portion is bent in the device of FIG. 1A.
折曲シール部５０は直接的に、低段部１０上に配置される基板６０Ａに対するストッパー部となるとは、図１Ｄおよび図１Ｅに示すように、折曲シール部５０の少なくとも上端部（５０１）が低段部１０の上面１１から突出しており、当該折曲シール部５０の突出部５０１が基板６０Ａに対するストッパー部となるという意味である。詳しくは折曲シール部５０の先端は低段部の上面１１の高さよりも高く突出している。図１Ｄおよび図１Ｅはそれぞれ、図１ＣのデバイスのＰ－Ｐ断面およびＱ－Ｑ断面を矢印方向でみたときのデバイスの模式的拡大断面図であって、折曲シール部が直接的に、低段部上に配置される基板に対するストッパー部となるときの状態を示す断面図である。
As shown in FIGS. 1D and 1E, the bent seal portion 50 directly becomes a stopper portion for the substrate 60 </ b> A disposed on the low step portion 10, and at least the upper end portion (501) of the bent seal portion 50. Means that the protruding portion 501 of the bent seal portion 50 serves as a stopper portion for the substrate 60A. Specifically, the tip of the bent seal portion 50 protrudes higher than the height of the upper surface 11 of the low step portion. 1D and 1E are schematic enlarged cross-sectional views of the device shown in FIG. 1C taken along the PP and QQ cross sections in the direction of the arrows, respectively, in which the bent seal portion is directly and low It is sectional drawing which shows a state when it becomes a stopper part with respect to the board | substrate arrange | positioned on a step part.
折曲シール部５０が低段部１０の上面１１から突出しない場合、当該折曲シール部５０は間接的に、低段部１０上に配置される基板６０Ａに対するストッパー部となる。折曲シール部５０は間接的に、低段部１０上に配置される基板６０Ａに対するストッパー部となるとは、図１Ｆおよび図１Ｇに示すように、当該折曲シール部５０が別部材として延長部材５００を支持することにより、当該延長部材５００を低段部１０の上面１１から突出させ、当該延長部材５００の突出部５０２が基板に対するストッパー部となるという意味である。折曲シール部５０による延長部材５００の支持は、延長部材の一部を折曲シール部５０と本体部（低段部または高段部）との間に挟み込み、これらを結合することにより、達成することができる。延長部材５００は折曲シール部５０を二次電池の厚み方向に延長する部材であり、通常、板形状を有する。延長部材を構成する材料としては、基板の位置ズレを防止できる程度の強度を有する材料であればあらゆる材料が使用可能であり、例えば、ポリオレフィン、ポリエステル、ポリアミド、ポリウレタン、ポリイミド等の有機ポリマーが挙げられる。結合手段は、折曲シール部５０と延長部材５００との結合が達成される限り特に限定されず、例えば、接着剤、貼着テープ等であってもよい。これらの図においては、結合手段として接着剤５６が使用されている。図１Ｆおよび図１Ｇはそれぞれ、図１ＣのデバイスのＰ－Ｐ断面およびＱ－Ｑ断面を矢印方向でみたときのデバイスの模式的拡大断面図であって、折曲シール部が間接的に、低段部上に配置される基板に対するストッパー部となるときの状態を示す断面図である。
When the bent seal portion 50 does not protrude from the upper surface 11 of the low step portion 10, the bent seal portion 50 indirectly becomes a stopper portion for the substrate 60A arranged on the low step portion 10. As shown in FIGS. 1F and 1G, the bent seal portion 50 indirectly becomes a stopper portion for the substrate 60 </ b> A disposed on the low step portion 10, and the bent seal portion 50 is an extension member as a separate member. By supporting 500, the extension member 500 is protruded from the upper surface 11 of the low step portion 10, and the protrusion 502 of the extension member 500 is a stopper portion for the substrate. Support of the extension member 500 by the bent seal portion 50 is achieved by sandwiching a part of the extension member between the bent seal portion 50 and the main body portion (low step portion or high step portion) and connecting them. can do. The extension member 500 is a member that extends the bent seal portion 50 in the thickness direction of the secondary battery, and usually has a plate shape. As the material constituting the extension member, any material can be used as long as the material has a strength that can prevent the displacement of the substrate, and examples thereof include organic polymers such as polyolefin, polyester, polyamide, polyurethane, and polyimide. It is done. The coupling means is not particularly limited as long as the coupling between the bent seal part 50 and the extending member 500 is achieved, and may be, for example, an adhesive or an adhesive tape. In these drawings, an adhesive 56 is used as a coupling means. 1F and FIG. 1G are schematic enlarged cross-sectional views of the device of FIG. 1C taken along the PP and QQ sections in the direction of the arrows, respectively, and the bent seal portion is indirectly low. It is sectional drawing which shows a state when it becomes a stopper part with respect to the board | substrate arrange | positioned on a step part.
折曲シール部５０が低段部１０の上面１１から突出する場合であっても、折曲シール部５０が別部材として延長部材５００を支持することにより、当該延長部材５００を低段部１０の上面１１から突出させてもよい（図示せず）。これにより、延長部材および折曲シール部の両方の突出部が基板に対するストッパー部となり、延長部材５００の突出部が折曲シール部の突出部を補強するため、位置ズレ防止の信頼性が向上する。
Even when the bent seal portion 50 protrudes from the upper surface 11 of the low step portion 10, the bent seal portion 50 supports the extension member 500 as a separate member, so that the extension member 500 of the low step portion 10 is supported. You may make it protrude from the upper surface 11 (not shown). As a result, the protruding portions of both the extension member and the bent seal portion serve as stopper portions for the substrate, and the protruding portion of the extending member 500 reinforces the protruding portion of the bent seal portion, thereby improving the reliability of misalignment prevention. .
折り曲げ方向は、二次電池１００Ａの厚み方向に略平行な方向であり、例えば、二次電池を載置したときの上方向のことである。折り曲げ方向は、具体的には、例えば図１Ｄおよび図１Ｆにおける右方向、図１Ｅおよび図１Ｇにおける上方向である。
The bending direction is a direction substantially parallel to the thickness direction of the secondary battery 100A, for example, the upward direction when the secondary battery is placed. Specifically, the bending direction is, for example, the right direction in FIGS. 1D and 1F and the upward direction in FIGS. 1E and 1G.
ストッパー作用について、具体的には、例えば、図１Ｃ、図１Ｄおよび図１Ｆに示すように、折曲シール部５０ａは突出部５０１または５０２において、基板６０Ａの上方向への位置ズレを防止する。また例えば、図１Ｃ、図１Ｅおよび図１Ｇに示すように、折曲シール部５０ｂは突出部５０１または５０２において、基板６０Ａの右方向への位置ズレを防止する。また例えば、図１Ｃ、図１Ｄおよび図１Ｆに示すように、折曲シール部５０ｃは突出部５０１または５０２において、基板６０Ａの下方向への位置ズレを防止する。
Regarding the stopper action, specifically, for example, as shown in FIGS. 1C, 1D, and 1F, the bent seal portion 50a prevents the upward displacement of the substrate 60A at the protruding portion 501 or 502. Further, for example, as shown in FIGS. 1C, 1E, and 1G, the bent seal portion 50b prevents the substrate 60A from being displaced in the right direction at the protruding portion 501 or 502. Further, for example, as shown in FIGS. 1C, 1D, and 1F, the bent seal portion 50c prevents the positional deviation of the substrate 60A in the downward direction at the protruding portion 501 or 502.
突出部５０１および５０２の高さｈ１（ｍｍ）は、当該突出部が基板の位置ズレに対するストッパー作用を発揮する限り特に限定されない。例えば、当該高さｈ１は、基板が配置される低段部の上面１１の高さＨ超であればよく、位置ズレのさらなる防止の観点からは、基板６０Ａの高さｈ２（ｍｍ）との関係で、以下の関係式（１）を満たすことが好ましく、以下の関係式（２）を満たすことがより好ましい。なお、当該高さｈ１の上限値は通常、二次電池１００Ａの最大高さｈ３（ｍｍ）以下である。
ｈ１≧ｈ２ （１）
ｈ３≧ｈ１≧ｈ２ （２） The height h1 (mm) of the protrusions 501 and 502 is not particularly limited as long as the protrusion exerts a stopper action against the positional deviation of the substrate. For example, the height h1 only needs to be higher than the height H of the upper surface 11 of the lower step portion on which the substrate is disposed. From the viewpoint of further preventing displacement, the height h1 is equal to the height h2 (mm) of the substrate 60A. In relation, it is preferable to satisfy the following relational expression (1), and it is more preferable to satisfy the following relational expression (2). The upper limit value of the height h1 is usually equal to or less than the maximum height h3 (mm) of the secondary battery 100A.
h1 ≧ h2 (1)
h3 ≧ h1 ≧ h2 (2)
ｈ１≧ｈ２ （１）
ｈ３≧ｈ１≧ｈ２ （２） The height h1 (mm) of the
h1 ≧ h2 (1)
h3 ≧ h1 ≧ h2 (2)
突出部５０１および５０２の高さｈ１（ｍｍ）、基板６０Ａの高さｈ２（ｍｍ）および二次電池１００Ａの最大高さｈ３（ｍｍ）はいずれも、二次電池を当該二次電池の最大面積の面を底面にして載置したときの、当該底面から各部材の先端（上端）までの高さであり、例えば、図１Ｄ、図１Ｅ、図１Ｆ、図１Ｇおよび図１Ｈ（以下、図１Ｄ～図１Ｈという）に示す各高さｈ１、ｈ２およびｈ３である。図１Ｈは、図１ＣのデバイスのＲ－Ｒ断面を矢印方向でみたときのデバイスの模式的拡大断面図を示す。
The height h1 (mm) of the protrusions 501 and 502, the height h2 (mm) of the substrate 60A, and the maximum height h3 (mm) of the secondary battery 100A are all the maximum area of the secondary battery. 1D, FIG. 1E, FIG. 1F, FIG. 1G, and FIG. 1H (hereinafter, FIG. 1D), for example, the height from the bottom surface to the tip (upper end) of each member. To heights h1, h2 and h3 shown in FIG. 1H). FIG. 1H is a schematic enlarged cross-sectional view of the device when the RR cross-section of the device of FIG. 1C is viewed in the direction of the arrow.
折曲シール部５０の折り曲げ形状は、例えば図１Ｄ～図１Ｈに示すように、単に１回折り曲げただけの単一折曲形状を有しているが、これに限定されるものではなく、例えば、図２Ａおよび図２Ｂに示すように、１回折り曲げた後、１回以上折り返して成る折り返し形状を有していてもよい。折曲シール部５０が折り返し形状を有する場合における折曲シール部５０（特に突出部５０１および５０２）の高さｈ１（ｍｍ）、基板６０Ａの高さｈ２（ｍｍ）、および二次電池１００の最大高さｈ３（ｍｍ）を図２Ａおよび図２Ｂに示す。図２Ａは、折曲シール部５０、特にその突出部５０１および５０２が基板のストッパー作用を発揮するときの折曲シール部近傍の模式的断面図である。図２Ｂは、二次電池の端部に折曲シール部５０を有するときの折曲シール部近傍の模式的断面図である。
For example, as shown in FIGS. 1D to 1H, the bent seal portion 50 has a single bent shape that is simply bent once, but is not limited thereto. As shown in FIGS. 2A and 2B, it may have a folded shape formed by bending once or more after being bent once. The height h1 (mm) of the bent seal portion 50 (particularly the protruding portions 501 and 502), the height h2 (mm) of the substrate 60A, and the maximum of the secondary battery 100 when the bent seal portion 50 has a folded shape. The height h3 (mm) is shown in FIGS. 2A and 2B. FIG. 2A is a schematic cross-sectional view in the vicinity of the bent seal portion 50 when the bent seal portion 50, particularly the protrusions 501 and 502 exert a stopper action on the substrate. FIG. 2B is a schematic cross-sectional view of the vicinity of the bent seal portion when the end portion of the secondary battery has the bent seal portion 50.
図１Ｃにおいては、低段部１０の３つの側面１０ａ、１０ｂおよび１０ｃのうち、全ての側面のシール部（図１Ｂ中、９１ａ～９１ｃ）が折り曲げられてストッパー部となっている。しかし、本実施態様はこれに限定されず、例えば、いずれか１つの側面のシール部が折り曲げられてストッパー部となっていてもよいし、またはいずれか２つの側面のシール部が折り曲げられてストッパー部となっていてもよい。位置ズレのさらなる防止の観点からは、３つの側面のシール部のうち全てのシール部が折り曲げられてストッパー部となっていることが好ましい。
In FIG. 1C, among the three side surfaces 10a, 10b and 10c of the low step portion 10, the seal portions (91a to 91c in FIG. 1B) on all the side surfaces are bent to form stopper portions. However, the present embodiment is not limited to this, and for example, any one of the side seal portions may be folded into a stopper portion, or any two side seal portions may be folded into the stopper. It may be a part. From the standpoint of further preventing misalignment, it is preferable that all of the seal portions on the three side surfaces are bent to form a stopper portion.
折曲シール部５０は、二次電池のいわゆる本体部（低段部および後段部）に結合されていなくてもよいが、位置ズレのさらなる防止の観点からは、少なくとも一部において、例えば図１Ｄ、図１Ｅ、図１Ｆ、図１Ｇおよび図１Ｈに示すように、上記した延長部材の結合手段と同様の結合手段により、本体部に結合されていることが好ましい。これらの図においては、結合手段として接着剤５６が使用されている。
The bent seal portion 50 may not be coupled to a so-called main body portion (a low-stage portion and a rear-stage portion) of the secondary battery. However, from the viewpoint of further preventing misalignment, for example, FIG. 1E, FIG. 1F, FIG. 1G, and FIG. 1H, it is preferable that it is coupled to the main body portion by a coupling means similar to the coupling means of the extension member described above. In these drawings, an adhesive 56 is used as a coupling means.
折曲シール部５０の突出部５０１および５０２は、基板６０Ａに結合されていても、または結合されていなくてもよいが、位置ズレのさらなる防止の観点からは、少なくとも一部において、例えば図１Ｄ、図１Ｅ、図１Ｆおよび図１Ｇに示すように、基板６０Ａに結合されていることが好ましい。これらの図においても、結合手段として接着剤５６が使用されている。
The protrusions 501 and 502 of the bent seal portion 50 may or may not be coupled to the substrate 60A. However, from the viewpoint of further preventing misalignment, at least in part, for example, FIG. As shown in FIGS. 1E, 1F and 1G, it is preferably bonded to the substrate 60A. Also in these drawings, the adhesive 56 is used as a coupling means.
基板６０Ａと二次電池のいわゆる本体部（低段部および後段部）とは、それらの接触部分の一部または全部において、相互に結合されていても、または結合されていなくてもよいが、位置ズレのさらなる防止の観点からは、少なくとも一部において、例えば図１Ｅおよび図１Ｇに示すように、結合されていることが好ましい。これらの図においても、結合手段として接着剤５６が使用されている。
The substrate 60A and the so-called main body part (low stage part and rear stage part) of the secondary battery may or may not be coupled to each other in part or all of the contact portions. From the standpoint of further preventing misalignment, it is preferable that at least a portion is coupled, for example, as shown in FIGS. 1E and 1G. Also in these drawings, the adhesive 56 is used as a coupling means.
シール部９１ａ～９１ｃが折り曲げられたときに生じる図１Ｂに示すような余剰分９５ａおよび９５ｂ（破線による隅領域）は、外装体内部の封止が維持される限り、裁断されてもよいし、または折り畳まれて折曲シール部５０のいずれかに結合（貼付）されてもよい。
The surplus portions 95a and 95b (corner areas indicated by broken lines) generated when the seal portions 91a to 91c are bent may be cut as long as the sealing inside the exterior body is maintained, Alternatively, it may be folded and bonded (attached) to one of the bent seal portions 50.
（第２実施態様）
本実施態様の二次電池は、第１実施態様の二次電池１００Ａを包含するものであり、第１実施態様の二次電池１００Ａにおいて１以上の段差部を有している。二次電池がｎ個の段差部を有するとき（ｎは１以上の自然数である）、当該二次電池は、高さが異なる（ｎ＋１）個の上面を有する。このとき、上面の高さが最も低いものから順に第１段部、第２段部、第３段部、・・・、および第（ｎ＋１）段部と呼ぶものとする。 (Second embodiment)
The secondary battery of this embodiment includes thesecondary battery 100A of the first embodiment, and has one or more step portions in the secondary battery 100A of the first embodiment. When the secondary battery has n step portions (n is a natural number of 1 or more), the secondary battery has (n + 1) upper surfaces with different heights. At this time, the first step portion, the second step portion, the third step portion,..., And the (n + 1) -th step portion are called in order from the lowest top surface.
本実施態様の二次電池は、第１実施態様の二次電池１００Ａを包含するものであり、第１実施態様の二次電池１００Ａにおいて１以上の段差部を有している。二次電池がｎ個の段差部を有するとき（ｎは１以上の自然数である）、当該二次電池は、高さが異なる（ｎ＋１）個の上面を有する。このとき、上面の高さが最も低いものから順に第１段部、第２段部、第３段部、・・・、および第（ｎ＋１）段部と呼ぶものとする。 (Second embodiment)
The secondary battery of this embodiment includes the
第２実施態様においてｎが１の場合、前記第１実施態様に相当し、低段部は第１段部のことである。この場合、本実施態様の二次電池は、第１段部（低段部）の上面に配置される基板との位置ズレを防止する。すなわち、第１段部が有する３つの側面のうち少なくとも１つの側面にあるシール部が折り曲げ可能となっている。このようなシール部が折り曲げられたときに形成される折曲シール部が直接的または間接的に当該第１段部の上面に配置される基板に対するストッパー部となり、結果として位置ズレが防止される。好ましい態様においては、第１段部が有する３つの側面にあるシール部が折曲シール部を形成し、当該折曲シール部が当該基板に対するストッパー部となる。
In the second embodiment, when n is 1, it corresponds to the first embodiment, and the low step portion is the first step portion. In this case, the secondary battery of this embodiment prevents misalignment with the substrate disposed on the upper surface of the first step portion (low step portion). That is, the seal portion on at least one of the three side surfaces of the first step portion can be bent. The bent seal portion formed when such a seal portion is bent serves as a stopper portion for the substrate disposed on the upper surface of the first step portion directly or indirectly, and as a result, misalignment is prevented. . In a preferred embodiment, the seal portions on the three side surfaces of the first step portion form a bent seal portion, and the bent seal portion serves as a stopper portion for the substrate.
第２実施態様においてｎが２以上の場合、低段部は上面の高さが最も高い段部以外の段部（すなわち、第１段部～第ｎ段部）からなる群から選択される。換言すると、ｎが２以上の本実施態様の二次電池においては、位置ズレ防止の対象となる基板が配置される段部の上面は、第１段部～第ｎ段部のうち、いずれの段部の上面であってもよい。
In the second embodiment, when n is 2 or more, the low step portion is selected from the group consisting of step portions other than the step portion having the highest top surface (that is, the first step portion to the n th step portion). In other words, in the secondary battery of the present embodiment in which n is 2 or more, the upper surface of the step portion on which the substrate to be prevented from being displaced is arranged on any of the first step portion to the n-th step portion. The upper surface of a step part may be sufficient.
例えば、第２実施態様においてｎが２以上であって、位置ズレ防止の対象となる基板が配置される段部が第１段部の上面とき、本実施態様においてｎが１の場合と同様に、当該第１段部が有する３つの側面のうち少なくとも１つの側面にあるシール部が折り曲げ可能となっている。このようなシール部が折り曲げられたときに形成される折曲シール部が直接的または間接的に当該第１段部の上面に配置される基板に対するストッパー部となり、結果として位置ズレが防止される。好ましい態様においては、第１段部が有する３つの側面にあるシール部が折曲シール部を形成し、当該３つの側面の折曲シール部が当該基板に対するストッパー部となる。
For example, in the second embodiment, when n is 2 or more and the step portion on which the substrate to be prevented from misalignment is arranged is the upper surface of the first step portion, similarly to the case where n is 1 in the present embodiment. The seal portion on at least one of the three side surfaces of the first step portion can be bent. The bent seal portion formed when such a seal portion is bent serves as a stopper portion for the substrate disposed on the upper surface of the first step portion directly or indirectly, and as a result, misalignment is prevented. . In a preferred embodiment, the seal portions on the three side surfaces of the first step portion form a bent seal portion, and the bent seal portions on the three side surfaces serve as stopper portions for the substrate.
また例えば、第２実施態様においてｎが２以上であって、位置ズレ防止の対象となる基板が配置される段部が第ｋ段部（ｋは２～ｎの整数）の上面のとき、当該第ｋ段部が有する側面（例えば２つの側面）のうち少なくとも１つの側面にあるシール部が折り曲げ可能となっている。このようなシール部が折り曲げられたときに形成される折曲シール部が直接的または間接的に当該第ｋ段部の上面に配置される基板に対するストッパー部となる。すなわち、第１実施態様におけるメカニズムと同様に、折曲シール部または延長部材の突出部が当該基板のストッパー部となり、結果として位置ズレが防止される。このとき、折曲シール部または延長部材は、第ｋ段部の下位の段部（第１段部～第（ｋ－１）段部）に基板が配置されていると、当該基板に対するストッパー部としても作用する。第（ｋ－１）段部の上面に配置される基板の高さが第ｋ段部の上面高さより高いと、第ｋ段部の上面に配置される基板の位置ズレがより一層、防止される。突出部の高さｈ１（ｍｍ）および基板の高さｈ２（ｍｍ）はそれぞれ、第１実施態様における突出部の高さｈ１および基板の高さｈ２と略同様であり、いずれも二次電池を当該二次電池の最大面積の面を底面にして載置したときの当該底面から各部材の先端（上端）までの高さである。突出部の高さｈ１（ｍｍ）は基板が配置される第ｋ段部の上面の高さＨ超であればよく、位置ズレのさらなる防止の観点からは、基板の高さｈ２（ｍｍ）との関係で、前記関係式（１）を満たすことが好ましく、前記関係式（２）を満たすことがより好ましい。なお、当該高さｈ１の上限値は通常、二次電池の最大高さｈ３（ｍｍ）以下である。
Further, for example, in the second embodiment, when n is 2 or more and the step portion on which the substrate to be prevented from being displaced is arranged is the upper surface of the k-th step portion (k is an integer of 2 to n), The seal portion on at least one of the side surfaces (for example, two side surfaces) of the k-th step portion can be bent. The bent seal portion formed when such a seal portion is bent serves as a stopper portion for the substrate disposed directly or indirectly on the upper surface of the k-th step portion. That is, similarly to the mechanism in the first embodiment, the bent seal portion or the protruding portion of the extension member serves as a stopper portion of the substrate, and as a result, misalignment is prevented. At this time, when the substrate is disposed at the lower step portion (the first step portion to the (k-1) step portion) of the kth step portion, the bent seal portion or the extending member is a stopper portion for the substrate. Also works. When the height of the substrate disposed on the upper surface of the (k−1) -th step portion is higher than the height of the upper surface of the k-th step portion, the displacement of the substrate disposed on the upper surface of the k-th step portion is further prevented. The The height h1 (mm) of the protrusion and the height h2 (mm) of the substrate are substantially the same as the height h1 of the protrusion and the height h2 of the substrate in the first embodiment, respectively. This is the height from the bottom surface to the tip (upper end) of each member when the secondary battery is placed with the surface having the maximum area as the bottom surface. The height h1 (mm) of the projecting portion only needs to be higher than the height H of the upper surface of the k-th step portion on which the substrate is arranged. From the viewpoint of further preventing positional displacement, the height h2 (mm) of the substrate is Therefore, it is preferable to satisfy the relational expression (1), and it is more preferable to satisfy the relational expression (2). The upper limit value of the height h1 is usually equal to or less than the maximum height h3 (mm) of the secondary battery.
具体的には、第２実施態様において２個（ｎ＝２）の段差部を有する二次電池１００Ｂの模式的斜視図および模式的平面図をそれぞれ図３Ａおよび図３Ｂに示す。図３Ａおよび図３Ｂの二次電池１００Ｂは、２個の段差部１５，２５を有すること、および位置ズレ防止の対象となる基板が配置される段部の上面が第２段部の上面であること以外、図１Ａおよび図１Ｂの二次電池と同様である。
Specifically, a schematic perspective view and a schematic plan view of a secondary battery 100B having two (n = 2) step portions in the second embodiment are shown in FIGS. 3A and 3B, respectively. The secondary battery 100B of FIGS. 3A and 3B has the two step portions 15 and 25, and the upper surface of the step portion on which the substrate to be prevented from being displaced is the upper surface of the second step portion. Except this, it is the same as the secondary battery of FIGS. 1A and 1B.
二次電池１００Ｂにおいては第２段部２０が有する側面のうち側面２０ａおよび２０ｃがシール部９１ａおよび９１ｃを有し、これらのシール部が折り曲げ可能となっている。側面２０ａは、図３Ａ中、図示されていないが、側面２０ｃと対向する面である。これらのシール部９１ａおよび９１ｃが、図３Ｃに示すように、折り曲げられたときに形成される折曲シール部５０ａおよび５０ｃが、直接的または間接的に当該第２段部の上面に配置される基板６０Ｂ１に対するストッパー部となる。詳しくは、図３Ｄに示すように、第１実施態様におけるメカニズムと同様に、折曲シール部５０ａおよび５０ｃ（または延長部材（図示せず））の突出部５０１が当該基板６０Ｂ１のストッパー部となり、それぞれ基板６０Ｂ１の上方向および下方向への位置ズレを防止する。このとき、図３Ａ～図３Ｃおよび図３Ｅに示すように、第１段部１０の上面１１に基板６０Ｂ２が配置されていると、折曲シール部５０ａおよび５０ｃ（または延長部材（図示せず））は当該基板に対するストッパー部としても作用する。図３Ｅにおいて、第１段部１０の基板６０Ｂ２の高さは第２段部２０の上面２１高さより低いが、第１段部１０の基板６０Ｂ２の高さが第２段部２０の上面２１高さより高いと、第２段部２０の基板６０Ｂ１の位置ズレがより一層、防止される。突出部５０１の高さｈ１（ｍｍ）および基板６０Ｂ１の高さｈ２（ｍｍ）はそれぞれ、第１実施態様における突出部の高さｈ１および基板の高さｈ２と略同様であり、いずれも二次電池を当該二次電池の最大面積の面を底面にして載置したときの当該底面から各部材の先端（上端）までの高さである。突出部５０１の高さｈ１（ｍｍ）は基板が配置される第２段部の上面の高さＨ超であればよく、位置ズレのさらなる防止の観点からは、基板の高さｈ２（ｍｍ）との関係で、前記関係式（１）を満たすことが好ましく、前記関係式（２）を満たすことがより好ましい。なお、当該高さｈ１の上限値は通常、二次電池の最大高さｈ３（ｍｍ）以下である。図３Ｃは図３Ａのデバイスにおいてシール部を折り曲げたときの状態を示す模式的平面図を示す。図３Ｄは図３ＣのデバイスのＰ－Ｐ断面を矢印方向でみたときのデバイスの模式的拡大断面図であって、折曲シール部が直接的に、低段部上に配置される基板に対するストッパー部となるときの状態を示す断面図である。図３Ｅは図３ＣのデバイスのＱ－Ｑ断面を矢印方向でみたときのデバイスの模式的拡大断面図であって、折曲シール部が直接的に、低段部上に配置される基板に対するストッパー部となるときの状態を示す断面図である。
In the secondary battery 100B, of the side surfaces of the second step portion 20, the side surfaces 20a and 20c have seal portions 91a and 91c, and these seal portions can be bent. Although not shown in FIG. 3A, the side surface 20a is a surface facing the side surface 20c. As shown in FIG. 3C, the bent seal portions 50a and 50c formed when these seal portions 91a and 91c are bent are arranged directly or indirectly on the upper surface of the second step portion. This is a stopper for the substrate 60B1. Specifically, as shown in FIG. 3D, similar to the mechanism in the first embodiment, the protruding portions 501 of the bent seal portions 50a and 50c (or the extension member (not shown)) serve as a stopper portion of the substrate 60B1. Each of the substrate 60B1 is prevented from being displaced upward and downward. At this time, as shown in FIGS. 3A to 3C and 3E, when the substrate 60B2 is disposed on the upper surface 11 of the first step portion 10, the bent seal portions 50a and 50c (or the extension member (not shown)) are provided. ) Also acts as a stopper for the substrate. 3E, the height of the substrate 60B2 of the first step portion 10 is lower than the height of the upper surface 21 of the second step portion 20, but the height of the substrate 60B2 of the first step portion 10 is higher than the upper surface 21 of the second step portion 20. If it is higher than this, the positional deviation of the substrate 60B1 of the second step portion 20 is further prevented. The height h1 (mm) of the protruding portion 501 and the height h2 (mm) of the substrate 60B1 are substantially the same as the height h1 of the protruding portion and the height h2 of the substrate in the first embodiment, respectively. This is the height from the bottom surface to the tip (upper end) of each member when the battery is placed with the maximum area of the secondary battery as the bottom surface. The height h1 (mm) of the protruding portion 501 may be higher than the height H of the upper surface of the second step portion on which the substrate is disposed. From the standpoint of further preventing positional displacement, the height h2 (mm) of the substrate. Therefore, the relational expression (1) is preferably satisfied, and the relational expression (2) is more preferably satisfied. The upper limit value of the height h1 is usually equal to or less than the maximum height h3 (mm) of the secondary battery. FIG. 3C is a schematic plan view showing a state when the seal portion is bent in the device of FIG. 3A. 3D is a schematic enlarged cross-sectional view of the device when the PP cross section of the device of FIG. 3C is viewed in the direction of the arrow, and a stopper for the substrate in which the bent seal portion is directly disposed on the low step portion. It is sectional drawing which shows a state when it becomes a part. 3E is a schematic enlarged cross-sectional view of the device of FIG. 3C viewed from the QQ section in the direction of the arrow, and a stopper for the substrate in which the bent seal portion is directly disposed on the low step portion. It is sectional drawing which shows a state when it becomes a part.
（第３実施態様）
本実施態様の二次電池１００Ｃは、上側外装部材６ａおよび下側外装部材６ｂの両方が厚みを有するカップ成形体であること以外、第１実施態様の二次電池１００Ａと同様である。 (Third embodiment)
Thesecondary battery 100C of the present embodiment is the same as the secondary battery 100A of the first embodiment, except that both the upper exterior member 6a and the lower exterior member 6b are cup molded bodies.
本実施態様の二次電池１００Ｃは、上側外装部材６ａおよび下側外装部材６ｂの両方が厚みを有するカップ成形体であること以外、第１実施態様の二次電池１００Ａと同様である。 (Third embodiment)
The
詳しくは、第１実施態様の二次電池１００Ａは、図４Ａに示すように、外装体６を構成する上側外装部材６ａのみが厚みを有するカップ成形体であるが、第３実施態様の二次電池１００Ｃは、当該二次電池内に収容される電極組立体の厚み（高さ）に応じて、図４Ｂに示すように、上側外装部材６ａおよび下側外装部材６ｂの両方が厚みを有するカップ成形体である。
Specifically, as shown in FIG. 4A, the secondary battery 100A of the first embodiment is a cup molded body in which only the upper exterior member 6a constituting the exterior body 6 has a thickness, but the secondary battery 100A of the third embodiment. As shown in FIG. 4B, the battery 100C is a cup in which both the upper exterior member 6a and the lower exterior member 6b have a thickness, depending on the thickness (height) of the electrode assembly housed in the secondary battery. It is a molded body.
本実施態様の二次電池１００Ｃにおいては、図５Ａ、図５Ｃおよび図５Ｄに示すように、シール部９１ａ～９１ｄおよび折曲シール部５０ａ～５０ｃが二次電池１００Ｃのいわゆる本体部の厚み方向の中央近傍から形成されている。図５Ａは、第３実施態様に係る二次電池と基板を含むデバイスの模式的斜視図を示す。図５Ｃおよび図５Ｄはそれぞれ、図５ＢのデバイスのＰ－Ｐ断面およびＲ－Ｒ断面を矢印方向でみたときのデバイスの模式的拡大断面図である。図５Ｂは図５Ａのデバイスにおいてシール部を折り曲げたときの状態を示す模式的平面図を示す。
In the secondary battery 100C of this embodiment, as shown in FIGS. 5A, 5C, and 5D, the seal portions 91a to 91d and the bent seal portions 50a to 50c are arranged in the thickness direction of the so-called main body portion of the secondary battery 100C. It is formed from the vicinity of the center. FIG. 5A is a schematic perspective view of a device including a secondary battery and a substrate according to the third embodiment. 5C and 5D are schematic enlarged cross-sectional views of the device when the PP cross-section and the RR cross-section of the device of FIG. 5B are viewed in the direction of the arrows, respectively. FIG. 5B is a schematic plan view showing a state when the seal portion is bent in the device of FIG. 5A.
本実施態様の二次電池１００Ｃにおいても、低段部１０の少なくとも１つの側面にあるシール部が当該二次電池１００Ｃの厚み方向に折り曲げ可能となっており、当該シール部に由来する少なくとも１つの折曲シール部５０（５０ａ～５０ｃを包含する）が直接的または間接的に、低段部１０の上面１１に配置される基板６０Ｃに対するストッパー部となる。
Also in the secondary battery 100C of the present embodiment, the seal portion on at least one side surface of the low step portion 10 can be bent in the thickness direction of the secondary battery 100C, and at least one derived from the seal portion. The bent seal portion 50 (including 50a to 50c) directly or indirectly becomes a stopper portion for the substrate 60C disposed on the upper surface 11 of the low step portion 10.
例えば図５Ｃに示すように、折曲シール部５０の少なくとも上端部（５０１）が低段部１０の上面１１から突出しており、当該折曲シール部５０の突出部５０１が基板６０Ｃに対するストッパー部となる。図５Ｃは、折曲シール部が直接的に、低段部上に配置される基板に対するストッパー部となるときの状態を示す断面図である。
For example, as shown in FIG. 5C, at least the upper end portion (501) of the bent seal portion 50 protrudes from the upper surface 11 of the low step portion 10, and the protruding portion 501 of the bent seal portion 50 is a stopper portion for the substrate 60C. Become. FIG. 5C is a cross-sectional view showing a state where the bent seal portion directly becomes a stopper portion for the substrate disposed on the low step portion.
折曲シール部５０が低段部１０の上面１１から突出しない場合、第１実施態様においてと同様に、当該折曲シール部５０が別部材として延長部材（図示せず）を支持することにより、当該延長部材を低段部１０の上面１１から突出させてもよい。当該延長部材の突出部が基板に対するストッパー部となる。
When the bent seal portion 50 does not protrude from the upper surface 11 of the low step portion 10, as in the first embodiment, the bent seal portion 50 supports an extension member (not shown) as a separate member, The extension member may protrude from the upper surface 11 of the low step portion 10. The protruding portion of the extension member serves as a stopper portion for the substrate.
本実施態様においても、突出部の高さｈ１（ｍｍ）、基板の高さｈ２（ｍｍ）および二次電池の最大高さｈ３（ｍｍ）はいずれも、二次電池を当該二次電池の最大面積の面を底面にして載置したときの、当該底面から各部材の先端（上端）までの高さであり、例えば、図５Ｃおよび図５Ｄに示す各高さｈ１、ｈ２およびｈ３である。
Also in this embodiment, the height h1 (mm) of the protruding portion, the height h2 (mm) of the substrate, and the maximum height h3 (mm) of the secondary battery are all the maximum of the secondary battery. This is the height from the bottom surface to the tip (upper end) of each member when placed with the surface of the area as the bottom surface, for example, the heights h1, h2, and h3 shown in FIGS. 5C and 5D.
（第４実施態様）
本実施態様の二次電池１００Ｄは、図６Ａおよび図６Ｂに示すように、低段部１０の３方が高段部２０に取り囲まれているため、低段部１０は１つのみの露出する側面１０ｄしか有さないこと、および低段部１０の当該１つの側面１０ｄに有するシール部が二次電池１００Ｄの厚み方向に折り曲げられて、低段部１０の上面１１に配置される基板６０Ｄに対するストッパー部となっていること以外、第１実施態様の二次電池１００Ａと同様である。図６Ａは、第４実施態様に係る二次電池と基板を含むデバイスの模式的斜視図を示す。図６Ｂは図６Ａのデバイスにおいてシール部を折り曲げたときの状態を示す模式的平面図を示す。 (Fourth embodiment)
In thesecondary battery 100D of this embodiment, as shown in FIGS. 6A and 6B, since the three sides of the low stage portion 10 are surrounded by the high stage portion 20, only one low stage portion 10 is exposed. Only the side surface 10d is provided, and the seal portion included in the one side surface 10d of the low step portion 10 is bent in the thickness direction of the secondary battery 100D, and the substrate 60D disposed on the upper surface 11 of the low step portion 10 The secondary battery is the same as the secondary battery 100A of the first embodiment except that it is a stopper portion. FIG. 6A is a schematic perspective view of a device including a secondary battery and a substrate according to the fourth embodiment. FIG. 6B is a schematic plan view showing a state when the seal portion is bent in the device of FIG. 6A.
本実施態様の二次電池１００Ｄは、図６Ａおよび図６Ｂに示すように、低段部１０の３方が高段部２０に取り囲まれているため、低段部１０は１つのみの露出する側面１０ｄしか有さないこと、および低段部１０の当該１つの側面１０ｄに有するシール部が二次電池１００Ｄの厚み方向に折り曲げられて、低段部１０の上面１１に配置される基板６０Ｄに対するストッパー部となっていること以外、第１実施態様の二次電池１００Ａと同様である。図６Ａは、第４実施態様に係る二次電池と基板を含むデバイスの模式的斜視図を示す。図６Ｂは図６Ａのデバイスにおいてシール部を折り曲げたときの状態を示す模式的平面図を示す。 (Fourth embodiment)
In the
本実施態様の二次電池１００Ｄにおいては、低段部１０が有する１つのみの側面１０ｄにあるシール部９１ｄが当該二次電池１００Ｄの厚み方向に折り曲げ可能となっており、当該シール部に由来する１つのみの折曲シール部５０ｂが直接的または間接的に、低段部１０の上面１１に配置される基板６０Ｄに対するストッパー部となる。
In the secondary battery 100D of this embodiment, the seal portion 91d on only one side surface 10d of the low step portion 10 can be bent in the thickness direction of the secondary battery 100D, and is derived from the seal portion. Only one bent seal portion 50b that acts as a stopper portion for the substrate 60D disposed on the upper surface 11 of the low step portion 10 is directly or indirectly.
以上、本発明の二次電池を幾つかの実施態様により説明したが、本発明の二次電池は、上記した実施態様を組み合わせた態様も包含する。全ての上面は通常、水平面に略平行で平面形状を有しているが、本発明は、本発明の目的が達成される限り、上面が水平面に対して傾斜していること、および上面が曲面形状を有していることを妨げるものではない。
As mentioned above, although the secondary battery of the present invention has been described with some embodiments, the secondary battery of the present invention includes an embodiment in which the above embodiments are combined. Although all the upper surfaces are usually substantially parallel to the horizontal surface and have a planar shape, the present invention is that the upper surface is inclined with respect to the horizontal surface and the upper surface is curved as long as the object of the present invention is achieved. It does not prevent having a shape.
［二次電池の構成部材］
電極組立体は、例えば、図４Ａおよび図４Ｂに示すように、正極１、負極２およびセパレータ３を含み、正極１と負極２とがセパレータ３を介して交互に配置されている。２つの外部端子５は通常、集電リードを介して電極（正極または負極）に連結され、結果としてシール部から外部に導出されている。これらの図において、電極組立体は、正極１、負極２および正極１と負極２との間に配置されたセパレータ３を含む複数の電極ユニット（電極構成層）を平面状に積層した平面積層構造を有している。電極組立体の構造は平面積層構造に限定されず、例えば、正極１、負極２および正極１と負極２との間に配置されたセパレータ３を含む電極ユニット（電極構成層）をロール状に巻回した巻回構造（ジェリーロール型）を有していてもよい。また例えば、電極組立体は、正極、セパレータ、負極を長いフィルム上に積層してから折りたたんだ、いわゆるスタックアンドフォールディング型構造を有していてもよい。 [Components of secondary battery]
For example, as shown in FIGS. 4A and 4B, the electrode assembly includes a positive electrode 1, anegative electrode 2, and a separator 3, and the positive electrode 1 and the negative electrode 2 are alternately arranged via the separator 3. The two external terminals 5 are usually connected to electrodes (positive electrode or negative electrode) via current collecting leads, and as a result, are led out from the seal portion. In these drawings, the electrode assembly has a planar laminated structure in which a plurality of electrode units (electrode constituent layers) including a positive electrode 1, a negative electrode 2, and a separator 3 arranged between the positive electrode 1 and the negative electrode 2 are laminated in a planar shape. have. The structure of the electrode assembly is not limited to a planar laminated structure. For example, an electrode unit (electrode constituent layer) including a positive electrode 1, a negative electrode 2, and a separator 3 disposed between the positive electrode 1 and the negative electrode 2 is wound in a roll shape. You may have a wound structure (jelly roll type). For example, the electrode assembly may have a so-called stack and folding structure in which a positive electrode, a separator, and a negative electrode are stacked on a long film and then folded.
電極組立体は、例えば、図４Ａおよび図４Ｂに示すように、正極１、負極２およびセパレータ３を含み、正極１と負極２とがセパレータ３を介して交互に配置されている。２つの外部端子５は通常、集電リードを介して電極（正極または負極）に連結され、結果としてシール部から外部に導出されている。これらの図において、電極組立体は、正極１、負極２および正極１と負極２との間に配置されたセパレータ３を含む複数の電極ユニット（電極構成層）を平面状に積層した平面積層構造を有している。電極組立体の構造は平面積層構造に限定されず、例えば、正極１、負極２および正極１と負極２との間に配置されたセパレータ３を含む電極ユニット（電極構成層）をロール状に巻回した巻回構造（ジェリーロール型）を有していてもよい。また例えば、電極組立体は、正極、セパレータ、負極を長いフィルム上に積層してから折りたたんだ、いわゆるスタックアンドフォールディング型構造を有していてもよい。 [Components of secondary battery]
For example, as shown in FIGS. 4A and 4B, the electrode assembly includes a positive electrode 1, a
正極１は少なくとも正極材層および正極集電体（箔）から構成されており、正極集電体の少なくとも片面に正極材層が設けられていればよい。例えば、正極１は、正極集電体の両面に正極材層が設けられていてもよいし、または正極集電体の片面に正極材層が設けられていてもよい。二次電池のさらなる高容量化の観点から好ましい正極１は正極集電体の両面に正極材層が設けられている。正極材層には正極活物質が含まれている。
The positive electrode 1 is composed of at least a positive electrode material layer and a positive electrode current collector (foil), and it is sufficient that the positive electrode material layer is provided on at least one surface of the positive electrode current collector. For example, in the positive electrode 1, a positive electrode material layer may be provided on both surfaces of the positive electrode current collector, or a positive electrode material layer may be provided on one surface of the positive electrode current collector. The positive electrode 1 preferable from the viewpoint of further increasing the capacity of the secondary battery is provided with a positive electrode material layer on both surfaces of the positive electrode current collector. The positive electrode material layer contains a positive electrode active material.
負極２は少なくとも負極材層および負極集電体（箔）から構成されており、負極集電体の少なくとも片面に負極材層が設けられていればよい。例えば、負極２は、負極集電体の両面に負極材層が設けられていてもよいし、または負極集電体の片面に負極材層が設けられていてもよい。二次電池のさらなる高容量化の観点から好ましい負極２は負極集電体の両面に負極材層が設けられている。負極材層には負極活物質が含まれている。
The negative electrode 2 is composed of at least a negative electrode material layer and a negative electrode current collector (foil), and it is sufficient that the negative electrode material layer is provided on at least one surface of the negative electrode current collector. For example, in the negative electrode 2, the negative electrode material layer may be provided on both surfaces of the negative electrode current collector, or the negative electrode material layer may be provided on one surface of the negative electrode current collector. From the viewpoint of further increasing the capacity of the secondary battery, the negative electrode 2 is preferably provided with a negative electrode material layer on both surfaces of the negative electrode current collector. The negative electrode material layer contains a negative electrode active material.
正極材層に含まれる正極活物質および負極材層に含まれる負極活物質は、二次電池において電子の受け渡しに直接関与する物質であり、充放電、すなわち電池反応を担う正負極の主物質である。より具体的には、「正極材層に含まれる正極活物質」および「負極材層に含まれる負極活物質」に起因して電解質にイオンがもたらされ、かかるイオンが正極と負極との間で移動して電子の受け渡しが行われて充放電がなされる。後述でも触れるが、正極材層および負極材層は特にリチウムイオンを吸蔵放出可能な層であることが好ましい。つまり、電解質を介してリチウムイオンが正極と負極との間で移動して電池の充放電が行われる二次電池が好ましい。充放電にリチウムイオンが関与する場合、本発明に係る二次電池は、いわゆる“リチウムイオン電池”に相当する。
The positive electrode active material included in the positive electrode material layer and the negative electrode active material included in the negative electrode material layer are materials directly involved in the transfer of electrons in the secondary battery, and are the main materials of the positive and negative electrodes that are responsible for charge / discharge, that is, the battery reaction. is there. More specifically, ions are brought into the electrolyte due to the “positive electrode active material included in the positive electrode material layer” and the “negative electrode active material included in the negative electrode material layer”, and the ions are interposed between the positive electrode and the negative electrode. Then, the electrons are transferred and the electrons are delivered and charged and discharged. As will be described later, the positive electrode material layer and the negative electrode material layer are particularly preferably layers capable of occluding and releasing lithium ions. That is, a secondary battery in which lithium ions move between the positive electrode and the negative electrode through the electrolyte to charge and discharge the battery is preferable. When lithium ions are involved in charging / discharging, the secondary battery according to the present invention corresponds to a so-called “lithium ion battery”.
正極材層の正極活物質は例えば粒状体から成るところ、粒子同士の十分な接触と形状保持のためにバインダー（“結着材”とも称される）が正極材層に含まれていることが好ましい。更には、電池反応を推進する電子の伝達を円滑にするために導電助剤が正極材層に含まれていることも好ましい。同様にして、負極材層の負極活物質は例えば粒状体から成るところ、粒子同士の十分な接触と形状保持のためにバインダーが含まれることが好ましく、電池反応を推進する電子の伝達を円滑にするために導電助剤が負極材層に含まれていてもよい。このように、複数の成分が含有されて成る形態ゆえ、正極材層および負極材層はそれぞれ“正極合材層”および“負極合材層”などと称すこともできる。
The positive electrode active material of the positive electrode material layer is made of, for example, a granular material, and a binder (also referred to as a “binder”) is included in the positive electrode material layer for sufficient contact between the particles and shape retention. preferable. Furthermore, it is also preferable that a conductive additive is included in the positive electrode material layer in order to facilitate the transmission of electrons that promote the battery reaction. Similarly, the negative electrode active material of the negative electrode material layer is made of, for example, a granular material, and it is preferable that a binder is included for sufficient contact and shape retention between the particles, and smooth transmission of electrons that promote the battery reaction. In order to do so, a conductive aid may be included in the negative electrode material layer. Thus, because of the form in which a plurality of components are contained, the positive electrode material layer and the negative electrode material layer can also be referred to as “positive electrode composite material layer” and “negative electrode composite material layer”, respectively.
正極活物質は、リチウムイオンの吸蔵放出に資する物質であることが好ましい。かかる観点でいえば、正極活物質は例えばリチウム含有複合酸化物であることが好ましい。より具体的には、正極活物質は、リチウムと、コバルト、ニッケル、マンガンおよび鉄から成る群から選択される少なくとも１種の遷移金属とを含むリチウム遷移金属複合酸化物であることが好ましい。つまり、本発明に係る二次電池の正極材層においては、そのようなリチウム遷移金属複合酸化物が正極活物質として好ましくは含まれている。例えば、正極活物質はコバルト酸リチウム、ニッケル酸リチウム、マンガン酸リチウム、リン酸鉄リチウム、または、それらの遷移金属の一部を別の金属で置き換えたものであってよい。このような正極活物質は、単独種として含まれてよいものの、二種以上が組み合わされて含まれていてもよい。より好適な態様では正極材層に含まれる正極活物質がコバルト酸リチウムとなっている。
The positive electrode active material is preferably a material that contributes to occlusion and release of lithium ions. From this point of view, the positive electrode active material is preferably, for example, a lithium-containing composite oxide. More specifically, the positive electrode active material is preferably a lithium transition metal composite oxide containing lithium and at least one transition metal selected from the group consisting of cobalt, nickel, manganese, and iron. That is, in the positive electrode material layer of the secondary battery according to the present invention, such a lithium transition metal composite oxide is preferably included as a positive electrode active material. For example, the positive electrode active material may be lithium cobaltate, lithium nickelate, lithium manganate, lithium iron phosphate, or a part of those transition metals replaced with another metal. Although such a positive electrode active material may be included as a single species, two or more types may be included in combination. In a more preferred embodiment, the positive electrode active material contained in the positive electrode material layer is lithium cobalt oxide.
正極材層に含まれる得るバインダーとしては、特に制限されるわけではないが、ポリフッ化ビリニデン、ビリニデンフルオライド－ヘキサフルオロプロピレン共重合体、ビリニデンフルオライド－テトラフルオロチレン共重合体およびポリテトラフルオロチレンなどから成る群から選択される少なくとも１種を挙げることができる。正極材層に含まれる得る導電助剤としては、特に制限されるわけではないが、サーマルブラック、ファーネスブラック、チャンネルブラック、ケッチェンブラックおよびアセチレンブラック等のカーボンブラック、黒鉛、カーボンナノチューブおよび気相成長炭素繊維等の炭素繊維、銅、ニッケル、アルミニウムおよび銀等の金属粉末、ならびに、ポリフェニレン誘導体などから選択される少なくとも１種を挙げることができる。より好適な態様では正極材層のバインダーはポリフッ化ビニリデンであり、また、別のより好適な態様では正極材層の導電助剤はカーボンブラックである。さらに好適な態様では、正極材層のバインダーおよび導電助剤が、ポリフッ化ビニリデンとカーボンブラックとの組合せとなっている。
The binder that can be included in the positive electrode material layer is not particularly limited, but includes polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, vinylidene fluoride-tetrafluoroethylene copolymer, and Mention may be made of at least one selected from the group consisting of polytetrafluoroethylene and the like. The conductive auxiliary agent that can be included in the positive electrode material layer is not particularly limited, but carbon black such as thermal black, furnace black, channel black, ketjen black, and acetylene black, graphite, carbon nanotube, and vapor phase growth. Examples thereof include at least one selected from carbon fibers such as carbon fibers, metal powders such as copper, nickel, aluminum and silver, and polyphenylene derivatives. In a more preferred aspect, the binder of the positive electrode material layer is polyvinylidene fluoride, and in another more preferred aspect, the conductive additive of the positive electrode material layer is carbon black. In a more preferred embodiment, the binder and conductive additive of the positive electrode material layer are a combination of polyvinylidene fluoride and carbon black.
負極活物質は、リチウムイオンの吸蔵放出に資する物質であることが好ましい。かかる観点でいえば、負極活物質は例えば各種の炭素材料、酸化物、または、リチウム合金などであることが好ましい。
The negative electrode active material is preferably a material that contributes to occlusion and release of lithium ions. From this point of view, the negative electrode active material is preferably, for example, various carbon materials, oxides, or lithium alloys.
負極活物質の各種の炭素材料としては、黒鉛（天然黒鉛、人造黒鉛）、ハードカーボン、ソフトカーボン、ダイヤモンド状炭素などを挙げることができる。特に、黒鉛は電子伝導性が高く、負極集電体との接着性が優れる点などで好ましい。負極活物質の酸化物としては、酸化シリコン、酸化スズ、酸化インジウム、酸化亜鉛および酸化リチウムなどから成る群から選択される少なくとも１種を挙げることができる。負極活物質のリチウム合金は、リチウムと合金形成され得る金属であればよく、例えば、Ａｌ、Ｓｉ、Ｐｂ、Ｓｎ、Ｉｎ、Ｂｉ、Ａｇ、Ｂａ、Ｃａ、Ｈｇ、Ｐｄ、Ｐｔ、Ｔｅ、Ｚｎ、Ｌａなどの金属とリチウムとの２元、３元またはそれ以上の合金であってよい。このような酸化物は、その構造形態としてアモルファスとなっていることが好ましい。結晶粒界または欠陥といった不均一性に起因する劣化が引き起こされにくくなるからである。より好適な態様では負極材層の負極活物質が人造黒鉛となっている。
Examples of various carbon materials of the negative electrode active material include graphite (natural graphite, artificial graphite), hard carbon, soft carbon, diamond-like carbon, and the like. In particular, graphite is preferable in that it has high electron conductivity and excellent adhesion to the negative electrode current collector. Examples of the oxide of the negative electrode active material include at least one selected from the group consisting of silicon oxide, tin oxide, indium oxide, zinc oxide, lithium oxide, and the like. The lithium alloy of the negative electrode active material may be any metal that can be alloyed with lithium. For example, Al, Si, Pb, Sn, In, Bi, Ag, Ba, Ca, Hg, Pd, Pt, Te, Zn, It may be a binary, ternary or higher alloy of a metal such as La and lithium. Such an oxide is preferably amorphous in its structural form. This is because deterioration due to non-uniformity such as crystal grain boundaries or defects is less likely to be caused. In a more preferred embodiment, the negative electrode active material of the negative electrode material layer is artificial graphite.
負極材層に含まれる得るバインダーとしては、特に制限されるわけではないが、スチレンブタジエンゴム、ポリアクリル酸、ポリフッ化ビニリデン、ポリイミド系樹脂およびポリアミドイミド系樹脂から成る群から選択される少なくとも１種を挙げることができる。より好適な実施態様では負極材層に含まれるバインダーはスチレンブタジエンゴムとなっている。負極材層に含まれる得る導電助剤としては、特に制限されるわけではないが、サーマルブラック、ファーネスブラック、チャンネルブラック、ケッチェンブラックおよびアセチレンブラック等のカーボンブラック、黒鉛、カーボンナノチューブおよび気相成長炭素繊維等の炭素繊維、銅、ニッケル、アルミニウムおよび銀等の金属粉末、ならびに、ポリフェニレン誘導体などから選択される少なくとも１種を挙げることができる。なお、負極材層には、電池製造時に使用された増粘剤成分（例えばカルボキシルメチルセルロース）に起因する成分が含まれていてもよい。
The binder that can be included in the negative electrode material layer is not particularly limited, but is at least one selected from the group consisting of styrene butadiene rubber, polyacrylic acid, polyvinylidene fluoride, polyimide resin, and polyamideimide resin. Can be mentioned. In a more preferred embodiment, the binder contained in the negative electrode material layer is styrene butadiene rubber. The conductive aid that can be included in the negative electrode material layer is not particularly limited, but carbon black such as thermal black, furnace black, channel black, ketjen black, and acetylene black, graphite, carbon nanotube, and vapor phase growth. Examples thereof include at least one selected from carbon fibers such as carbon fibers, metal powders such as copper, nickel, aluminum and silver, and polyphenylene derivatives. In addition, the component resulting from the thickener component (for example, carboxymethylcellulose) used at the time of battery manufacture may be contained in the negative electrode material layer.
さらに好適な態様では、負極材層における負極活物質およびバインダーが人造黒鉛とスチレンブタジエンゴムとの組合せとなっている。
In a more preferred embodiment, the negative electrode active material and the binder in the negative electrode material layer are a combination of artificial graphite and styrene butadiene rubber.
正極および負極に用いられる正極集電体および負極集電体は電池反応に起因して活物質で発生した電子を集めたり供給したりするのに資する部材である。このような集電体は、シート状の金属部材であってよく、多孔または穿孔の形態を有していてよい。例えば、集電体は金属箔、パンチングメタル、網またはエキスパンドメタル等であってよい。正極に用いられる正極集電体は、アルミニウム、ステンレスおよびニッケル等から成る群から選択される少なくとも１種を含んだ金属箔から成るものが好ましく、例えばアルミニウム箔であってよい。一方、負極に用いられる負極集電体は、銅、ステンレスおよびニッケル等から成る群から選択される少なくとも１種を含んだ金属箔から成るものが好ましく、例えば銅箔であってよい。
The positive electrode current collector and the negative electrode current collector used for the positive electrode and the negative electrode are members that contribute to collecting and supplying electrons generated in the active material due to the battery reaction. Such a current collector may be a sheet-like metal member and may have a porous or perforated form. For example, the current collector may be a metal foil, a punching metal, a net or an expanded metal. The positive electrode current collector used for the positive electrode is preferably made of a metal foil containing at least one selected from the group consisting of aluminum, stainless steel, nickel and the like, and may be, for example, an aluminum foil. On the other hand, the negative electrode current collector used for the negative electrode is preferably made of a metal foil containing at least one selected from the group consisting of copper, stainless steel, nickel and the like, and may be, for example, a copper foil.
セパレータ３は、正負極の接触による短絡防止および電解質保持などの観点から設けられる部材である。換言すれば、セパレータは、正極と負極との間の電子的接触を防止しつつイオンを通過させる部材であるといえる。好ましくは、セパレータは多孔性または微多孔性の絶縁性部材であり、その小さい厚みに起因して膜形態を有している。あくまでも例示にすぎないが、ポリオレフィン製の微多孔膜がセパレータとして用いられてよい。この点、セパレータとして用いられる微多孔膜は、例えば、ポリオレフィンとしてポリエチレン（ＰＥ）のみ又はポリプロピレン（ＰＰ）のみを含んだものであってよい。更にいえば、セパレータは、“ＰＥ製の微多孔膜”と“ＰＰ製の微多孔膜”とから構成される積層体であってもよい。セパレータの表面は無機粒子コート層および／または接着層等により覆われていてもよい。セパレータの表面は接着性を有していてもよい。
The separator 3 is a member provided from the viewpoints of preventing a short circuit due to contact between the positive and negative electrodes and holding the electrolyte. In other words, the separator can be said to be a member that allows ions to pass while preventing electronic contact between the positive electrode and the negative electrode. Preferably, the separator is a porous or microporous insulating member and has a film form due to its small thickness. Although only illustrative, a polyolefin microporous film may be used as the separator. In this regard, the microporous membrane used as the separator may include, for example, only polyethylene (PE) or only polypropylene (PP) as the polyolefin. Furthermore, the separator may be a laminate composed of “a microporous membrane made of PE” and “a microporous membrane made of PP”. The surface of the separator may be covered with an inorganic particle coat layer and / or an adhesive layer. The surface of the separator may have adhesiveness.
電解質は電極（正極・負極）から放出された金属イオンの移動を助力する。電解質は有機電解質および有機溶媒などの“非水系”の電解質であっても、または水を含む“水系”の電解質であってもよい。本発明の二次電池は、電解質として“非水系”の溶媒と、溶質とを含む電解質が用いられた非水電解質二次電池が好ましい。電解質は液体状またはゲル状などの形態を有し得る（なお、本明細書において“液体状”の非水電解質は「非水電解質液」とも称される）。
Electrolyte helps the movement of metal ions released from the electrodes (positive and negative electrodes). The electrolyte may be a “non-aqueous” electrolyte, such as an organic electrolyte and an organic solvent, or may be a “aqueous” electrolyte containing water. The secondary battery of the present invention is preferably a non-aqueous electrolyte secondary battery in which an electrolyte containing a “non-aqueous” solvent and a solute is used as an electrolyte. The electrolyte may have a form such as liquid or gel (in the present specification, “liquid” non-aqueous electrolyte is also referred to as “non-aqueous electrolyte solution”).
具体的な非水電解質の溶媒としては、少なくともカーボネートを含んで成るものが好ましい。かかるカーボネートは、環状カーボネート類および／または鎖状カーボネート類であってもよい。特に制限されるわけではないが、環状カーボネート類としては、プロピレンカーボネート（ＰＣ）、エチレンカーボネート（ＥＣ）、ブチレンカーボネート（ＢＣ）およびビニレンカーボネート（ＶＣ）から成る群から選択される少なくとも１種を挙げることができる。鎖状カーボネート類としては、ジメチルカーボネート（ＤＭＣ）、ジエチルカーボネート（ＤＥＣ）、エチルメチルカーボネート（ＥＭＣ）およびジプロピルカーボネート（ＤＰＣ）から成る群から選択される少なくも１種を挙げることができる。本発明の１つの好適な実施態様では、非水電解質として環状カーボネート類と鎖状カーボネート類との組合せが用いられ、例えばエチレンカーボネートとジエチルカーボネートとの混合物が用いられる。
具体的な非水電解質の溶質としては、例えば、ＬｉＰＦ６およびＬｉＢＦ４などのＬｉ塩が好ましく用いられる。 As a specific non-aqueous electrolyte solvent, a solvent containing at least carbonate is preferable. Such carbonates may be cyclic carbonates and / or chain carbonates. Although not particularly limited, examples of the cyclic carbonates include at least one selected from the group consisting of propylene carbonate (PC), ethylene carbonate (EC), butylene carbonate (BC), and vinylene carbonate (VC). be able to. Examples of the chain carbonates include at least one selected from the group consisting of dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), and dipropyl carbonate (DPC). In one preferred embodiment of the present invention, a combination of cyclic carbonates and chain carbonates is used as the non-aqueous electrolyte, for example, a mixture of ethylene carbonate and diethyl carbonate.
As specific nonaqueous electrolyte solutes, for example, Li salts such as LiPF 6 and LiBF 4 are preferably used.
具体的な非水電解質の溶質としては、例えば、ＬｉＰＦ６およびＬｉＢＦ４などのＬｉ塩が好ましく用いられる。 As a specific non-aqueous electrolyte solvent, a solvent containing at least carbonate is preferable. Such carbonates may be cyclic carbonates and / or chain carbonates. Although not particularly limited, examples of the cyclic carbonates include at least one selected from the group consisting of propylene carbonate (PC), ethylene carbonate (EC), butylene carbonate (BC), and vinylene carbonate (VC). be able to. Examples of the chain carbonates include at least one selected from the group consisting of dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), and dipropyl carbonate (DPC). In one preferred embodiment of the present invention, a combination of cyclic carbonates and chain carbonates is used as the non-aqueous electrolyte, for example, a mixture of ethylene carbonate and diethyl carbonate.
As specific nonaqueous electrolyte solutes, for example, Li salts such as LiPF 6 and LiBF 4 are preferably used.
集電リードとしては、二次電池の分野で使用されているあらゆる集電リードが使用可能である。そのような集電リードは、電子の移動が達成され得る材料から構成されればよく、通常はアルミニウム、ニッケル、鉄、銅、ステンレスなどの導電性材料から構成される。集電リードの形態は特に限定されず、例えば、線状であってもよいし、または板状であってもよい。
As the current collecting lead, any current collecting lead used in the field of secondary batteries can be used. Such a current collecting lead may be made of a material capable of achieving electron movement, and is usually made of a conductive material such as aluminum, nickel, iron, copper, and stainless steel. The form of the current collecting lead is not particularly limited, and may be, for example, a linear shape or a plate shape.
外部端子５としては、二次電池の分野で使用されているあらゆる外部端子が使用可能である。そのような外部端子は、電子の移動が達成され得る材料から構成されればよく、通常はアルミニウム、ニッケル、鉄、銅、ステンレスなどの導電性材料から構成される。外部端子５の形態は特に限定されず、通常は板状である。外部端子５は、基板６０と電気的かつ直接的に接続されてもよいし、または他のデバイスを介して基板６０と電気的かつ間接的に接続されてもよい。また、前記集電リードを外部端子として用いることも可能である。
As the external terminal 5, any external terminal used in the field of secondary batteries can be used. Such an external terminal may be made of a material capable of achieving electron movement, and is usually made of a conductive material such as aluminum, nickel, iron, copper, and stainless steel. The form of the external terminal 5 is not particularly limited, and is usually plate-shaped. The external terminal 5 may be electrically and directly connected to the substrate 60, or may be electrically and indirectly connected to the substrate 60 through another device. The current collecting lead can also be used as an external terminal.
外装体６は軟質シートから構成されるフレキシブルパウチ（軟質袋体）である。軟質シートは、シール部の折り曲げを達成できる程度の軟質性を有していればよく、好ましく可塑性シートである。可塑性シートは、外力を付与した後、除去したとき、外力による変形が維持される特性を有するシートのことであり、例えば、いわゆるラミネートフィルムが使用できる。ラミネートフィルムからなるフレキシブルパウチは例えば、２枚のラミネートフィルムを重ね合わせ、その周縁部をヒートシールすることにより製造できる。ラミネートフィルムとしては、金属箔とポリマーフィルムを積層したフィルムが一般的であり、具体的には、外層ポリマーフィルム／金属箔／内層ポリマーフィルムから成る３層構成のものが例示される。外層ポリマーフィルムは水分等の透過および接触等による金属箔の損傷を防止するためのものであり、ポリアミドおよびポリエステル等のポリマーが好適に使用できる。金属箔は水分およびガスの透過を防止するためのものであり、銅、アルミニウム、ステンレス等の箔が好適に使用できる。内層ポリマーフィルムは、内部に収納する電解質から金属箔を保護するとともに、ヒートシール時に溶融封口させるためのものであり、ポリオレフィンまたは酸変性ポリオレフィンが好適に使用できる。ラミネートフィルムの厚さは特に限定されず、例えば、１μｍ以上１ｍｍ以下が好ましい。
The exterior body 6 is a flexible pouch (soft bag) made of a soft sheet. The soft sheet only needs to have a degree of softness that can achieve bending of the seal portion, and is preferably a plastic sheet. The plastic sheet is a sheet having a characteristic that the deformation due to the external force is maintained when the external sheet is applied and then removed. For example, a so-called laminate film can be used. A flexible pouch made of a laminate film can be produced, for example, by laminating two laminate films and heat-sealing the peripheral edge. As the laminate film, a film obtained by laminating a metal foil and a polymer film is generally used. Specifically, a film having a three-layer structure including an outer layer polymer film / metal foil / inner layer polymer film is exemplified. The outer layer polymer film is for preventing damage to the metal foil due to permeation and contact of moisture and the like, and polymers such as polyamide and polyester can be suitably used. The metal foil is for preventing the permeation of moisture and gas, and a foil of copper, aluminum, stainless steel or the like can be suitably used. The inner layer polymer film is for protecting the metal foil from the electrolyte accommodated therein, and for melting and sealing at the time of heat sealing, and polyolefin or acid-modified polyolefin can be suitably used. The thickness of the laminate film is not particularly limited, and is preferably 1 μm or more and 1 mm or less, for example.
［基板］
基板６０（６０Ａ、６０Ｂ１、６０Ｂ２、６０Ｃおよび６０Ｄを包含する）はいわゆるリジッド基板であってもよいし、またはフレキシブル基板であってもよい。好ましくはリジッド基板である。リジッド基板を用いた場合、デットスペースの形成や当該基板による二次電池の損傷が問題となりやすいところ、本発明においてリジッド基板を用いた場合においても、そのような問題を十分に回避できるためである。リジッド基板としては、二次電池とともに使用される基板の分野で使用されるあらゆるリジッド基板が使用可能であり、例えば、ガラス・エポキシ樹脂基板が挙げられる。 [substrate]
The substrate 60 (including 60A, 60B1, 60B2, 60C and 60D) may be a so-called rigid substrate or a flexible substrate. A rigid substrate is preferred. This is because when a rigid substrate is used, formation of a dead space and damage to the secondary battery due to the substrate are likely to be a problem, and even when a rigid substrate is used in the present invention, such a problem can be sufficiently avoided. . As the rigid substrate, any rigid substrate used in the field of substrates used with secondary batteries can be used, and examples thereof include a glass / epoxy resin substrate.
基板６０（６０Ａ、６０Ｂ１、６０Ｂ２、６０Ｃおよび６０Ｄを包含する）はいわゆるリジッド基板であってもよいし、またはフレキシブル基板であってもよい。好ましくはリジッド基板である。リジッド基板を用いた場合、デットスペースの形成や当該基板による二次電池の損傷が問題となりやすいところ、本発明においてリジッド基板を用いた場合においても、そのような問題を十分に回避できるためである。リジッド基板としては、二次電池とともに使用される基板の分野で使用されるあらゆるリジッド基板が使用可能であり、例えば、ガラス・エポキシ樹脂基板が挙げられる。 [substrate]
The substrate 60 (including 60A, 60B1, 60B2, 60C and 60D) may be a so-called rigid substrate or a flexible substrate. A rigid substrate is preferred. This is because when a rigid substrate is used, formation of a dead space and damage to the secondary battery due to the substrate are likely to be a problem, and even when a rigid substrate is used in the present invention, such a problem can be sufficiently avoided. . As the rigid substrate, any rigid substrate used in the field of substrates used with secondary batteries can be used, and examples thereof include a glass / epoxy resin substrate.
基板としては、プリント基板などの電子回路基板、シリコンウェハーなどの半導体基板、ディスプレイパネルなどのガラス基板等が挙げられる。
Examples of the substrate include an electronic circuit substrate such as a printed circuit board, a semiconductor substrate such as a silicon wafer, and a glass substrate such as a display panel.
基板が、二次電池の過充電、過放電および過電流を防止するための、いわゆる保護回路基板であるとき、当該保護回路基板および上記二次電池より、二次電池パックが構成される。
When the board is a so-called protection circuit board for preventing overcharge, overdischarge and overcurrent of the secondary battery, a secondary battery pack is constituted by the protection circuit board and the secondary battery.
本発明に係る二次電池は、蓄電が想定される様々な分野に利用することができる。あくまでも例示にすぎないが、本発明に係る二次電池、特に非水電解質二次電池は、モバイル機器などが使用される電気・情報・通信分野（例えば、携帯電話、スマートフォン、スマートウォッチ、ノートパソコンおよびデジタルカメラなどのモバイル機器分野）、家庭・小型産業用途（例えば、電動工具、ゴルフカート、家庭用・介護用・産業用ロボットの分野）、大型産業用途（例えば、フォークリフト、エレベーター、湾港クレーンの分野）、交通システム分野（例えば、ハイブリッド車、電気自動車、バス、電車、電動アシスト自転車、電動二輪車などの分野）、電力系統用途（例えば、各種発電、ロードコンディショナー、スマートグリッド、一般家庭設置型蓄電システムなどの分野）、ならびに、宇宙・深海用途（例えば、宇宙探査機、潜水調査船などの分野）に利用することができる。
The secondary battery according to the present invention can be used in various fields where power storage is assumed. The secondary battery according to the present invention, particularly the non-aqueous electrolyte secondary battery, is merely an example, and the electric / information / communication field (for example, a mobile phone, a smart phone, a smart watch, a laptop computer) in which a mobile device is used. And mobile devices such as digital cameras), home / small industrial applications (eg, power tools, golf carts, home / care / industrial robots), large industrial applications (eg, forklifts, elevators, bay harbor cranes) Field), transportation system field (for example, fields such as hybrid vehicles, electric vehicles, buses, trains, electric assist bicycles, electric motorcycles), power system applications (for example, various power generation, road conditioners, smart grids, general home-installed types) Fields such as power storage systems), as well as space and deep sea applications (for example, space)査機, it can be used in the field), such as diving research vessel.
１：正極
２：負極
３：セパレータ
５：外部端子
６：外装体
６ａ：上側外装部材
６ｂ：下側外装部材
１０：第１段部（低段部）
１０ａ：１０ｂ：１０ｃ：側面
２０：第２段部
３０：第３段部
５０：５０ａ：５０ｂ：５０ｃ：シール部が折り曲げられた折曲シール部
５６：接着剤
６０：６０Ａ：６０Ｂ：６０Ｃ：６０Ｄ：基板
９０：９１ａ～９１ｄ：シール部
１００：１００Ａ：１００Ｂ：１００Ｃ：１００Ｄ：二次電池 1: Positive electrode 2: Negative electrode 3: Separator 5: External terminal 6:Exterior body 6a: Upper exterior member 6b: Lower exterior member 10: First step (low step)
10a: 10b: 10c: Side surface 20: Second step portion 30: Third step portion 50: 50a: 50b: 50c: Bent seal portion where the seal portion is bent 56: Adhesive 60: 60A: 60B: 60C: 60D : Substrate 90: 91a to 91d: Sealing part 100: 100A: 100B: 100C: 100D: Secondary battery
２：負極
３：セパレータ
５：外部端子
６：外装体
６ａ：上側外装部材
６ｂ：下側外装部材
１０：第１段部（低段部）
１０ａ：１０ｂ：１０ｃ：側面
２０：第２段部
３０：第３段部
５０：５０ａ：５０ｂ：５０ｃ：シール部が折り曲げられた折曲シール部
５６：接着剤
６０：６０Ａ：６０Ｂ：６０Ｃ：６０Ｄ：基板
９０：９１ａ～９１ｄ：シール部
１００：１００Ａ：１００Ｂ：１００Ｃ：１００Ｄ：二次電池 1: Positive electrode 2: Negative electrode 3: Separator 5: External terminal 6:
10a: 10b: 10c: Side surface 20: Second step portion 30: Third step portion 50: 50a: 50b: 50c: Bent seal portion where the seal portion is bent 56: Adhesive 60: 60A: 60B: 60C: 60D : Substrate 90: 91a to 91d: Sealing part 100: 100A: 100B: 100C: 100D: Secondary battery
Claims (17)
- 正極、負極および該正極と該負極との間に配置されたセパレータを含む電極組立体および電解質が外装体に封入された二次電池であって、
前記二次電池が互いに高さの異なる２つの上面により構成される段差部を１つ以上有し、
前記上面の高さが相対的に低い低段部の少なくとも１つの側面にシール部を有し、
該シール部が前記二次電池の厚み方向に折り曲げ可能となっており、
該シール部が折り曲げられたときに形成される折曲シール部が、前記低段部の上面に配置される基板に対するストッパー部となる、二次電池。 An electrode assembly including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, and a secondary battery in which an electrolyte is enclosed in an exterior body,
The secondary battery has at least one step portion constituted by two upper surfaces having different heights;
A seal portion on at least one side surface of the low step portion having a relatively low height of the upper surface;
The seal part can be bent in the thickness direction of the secondary battery,
A secondary battery in which a bent seal portion formed when the seal portion is bent serves as a stopper portion for a substrate disposed on an upper surface of the low step portion. - 前記段差部の数が１のとき、前記低段部は前記上面の高さが最も低い第１段部である、請求項１に記載の二次電池。 The secondary battery according to claim 1, wherein when the number of the stepped portions is 1, the low stepped portion is a first stepped portion having the lowest top surface.
- 前記段差部の数が２以上のとき、前記低段部は前記上面の高さが最も高い段部以外の段部からなる群から選択される、請求項１に記載の二次電池。 The secondary battery according to claim 1, wherein when the number of stepped portions is two or more, the low stepped portion is selected from the group consisting of stepped portions other than the stepped portion having the highest upper surface height.
- 前記折曲シール部の少なくとも上端部が前記低段部の上面から突出し、該折曲シール部の突出部が前記基板に対するストッパー部となる、請求項１～３のいずれかに記載の二次電池。 The secondary battery according to any one of claims 1 to 3, wherein at least an upper end portion of the bent seal portion protrudes from an upper surface of the low step portion, and a protruding portion of the bent seal portion serves as a stopper portion for the substrate. .
- 前記折曲シール部が延長部材を支持し、該延長部材の少なくとも上端部が前記低段部の上面から突出し、該延長部材の突出部が前記基板に対するストッパー部となる、請求項１～３のいずれかに記載の二次電池。 The bent seal portion supports an extension member, at least an upper end portion of the extension member protrudes from an upper surface of the low step portion, and a protrusion portion of the extension member serves as a stopper portion for the substrate. A secondary battery according to any one of the above.
- 前記突出部が前記基板と結合される、請求項４または５に記載の二次電池。 The secondary battery according to claim 4 or 5, wherein the protrusion is coupled to the substrate.
- 前記突出部の高さｈ１および前記基板の高さｈ２は以下の関係式を満たす、請求項４～６のいずれかに記載の二次電池：
ｈ１≧ｈ２。 The secondary battery according to claim 4, wherein the height h1 of the protrusion and the height h2 of the substrate satisfy the following relational expression:
h1 ≧ h2. - 前記二次電池が２つの外部端子をさらに備え、
該２つの外部端子は基板と電気的に接続される、請求項１～７のいずれかに記載の二次電池。 The secondary battery further includes two external terminals,
The secondary battery according to any one of claims 1 to 7, wherein the two external terminals are electrically connected to a substrate. - 前記外装体が可塑性シートから構成されている、請求項１～８のいずれかに記載の二次電池。 The secondary battery according to any one of claims 1 to 8, wherein the exterior body is made of a plastic sheet.
- 前記外装体がフレキシブルパウチである、請求項１～９のいずれかに記載の二次電池。 The secondary battery according to any one of claims 1 to 9, wherein the outer package is a flexible pouch.
- 前記電極組立体が、前記正極、前記負極および前記セパレータを含む複数の電極ユニットを平面状に積層した平面積層構造を有するか、または前記正極、前記負極および前記セパレータを含む電極ユニットをロール状に巻回した巻回構造を有する、請求項１～１０のいずれかに記載の二次電池。 The electrode assembly has a planar stacked structure in which a plurality of electrode units including the positive electrode, the negative electrode, and the separator are stacked in a planar shape, or the electrode unit including the positive electrode, the negative electrode, and the separator is rolled. The secondary battery according to any one of claims 1 to 10, which has a wound structure.
- 前記基板がリジッド基板またはフレキシブル基板である、請求項１～１１のいずれかに記載の二次電池。 The secondary battery according to any one of claims 1 to 11, wherein the substrate is a rigid substrate or a flexible substrate.
- 前記基板が保護回路基板である、請求項１～１２のいずれかに記載の二次電池。 The secondary battery according to any one of claims 1 to 12, wherein the substrate is a protective circuit substrate.
- 前記正極および前記負極がリチウムイオンを吸蔵放出可能な層を有する、請求項１～１３のいずれかに記載の二次電池。 The secondary battery according to any one of claims 1 to 13, wherein the positive electrode and the negative electrode have a layer capable of inserting and extracting lithium ions.
- 請求項１～１４のいずれかに記載の前記二次電池；および
前記低段部上に配置された基板を含む、デバイス。 A device comprising: the secondary battery according to any one of claims 1 to 14; and a substrate disposed on the lower stage portion. - 前記基板が保護回路基板であり、
前記デバイスが二次電池パックである、請求項１５に記載のデバイス。 The substrate is a protective circuit substrate;
The device according to claim 15, wherein the device is a secondary battery pack. - 前記デバイスがモバイル機器である、請求項１５または１６に記載のデバイス。 The device according to claim 15 or 16, wherein the device is a mobile device.
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| JP2000285881A (en) * | 1999-03-30 | 2000-10-13 | Kyocera Corp | Thin battery and its manufacture |
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| JP2002260608A (en) * | 2001-02-27 | 2002-09-13 | Sanyo Electric Co Ltd | Packed battery |
| JP2006093101A (en) * | 2004-09-24 | 2006-04-06 | Samsung Sdi Co Ltd | Lithium polymer battery with strength reinforcement layer and its manufacturing method |
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