CN113169368A - Battery, battery pack, power storage device, vehicle, and flying object - Google Patents
Battery, battery pack, power storage device, vehicle, and flying object Download PDFInfo
- Publication number
- CN113169368A CN113169368A CN201880100276.3A CN201880100276A CN113169368A CN 113169368 A CN113169368 A CN 113169368A CN 201880100276 A CN201880100276 A CN 201880100276A CN 113169368 A CN113169368 A CN 113169368A
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- positive electrode
- negative electrode
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/547—Terminals characterised by the disposition of the terminals on the cells
- H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
-
- 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
- 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
- H01M50/172—Arrangements of electric connectors penetrating the casing
- H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
- H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/564—Terminals characterised by their manufacturing process
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Secondary Cells (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
The present invention solves the problem of providing a battery, a battery pack, a power storage device, a vehicle, and a vehicle, each of which has a lead shape having excellent large current characteristics among thin batteries. The battery (100) of the embodiment includes: a flat electrode group (3) including a positive electrode (7), a positive electrode collector tab (7a) electrically connected to the positive electrode (7), a negative electrode (8), and a negative electrode collector tab (8a) electrically connected to the negative electrode (8); an outer packaging member (1) comprising a first outer packaging part (5) and a second outer packaging part (6); a positive terminal section (3); a negative electrode terminal section (4); a first positive electrode insulation reinforcing member (24) including a positive electrode insulation reinforcing holding portion (24 a); and a first negative-electrode insulation reinforcing member (37) including a negative-electrode insulation reinforcing holding portion (37 a).
Description
Technical Field
Embodiments of the invention relate to a battery, a battery pack, a power storage device, a vehicle, and a flight vehicle.
Background
Batteries such as primary batteries and secondary batteries generally include: an electrode assembly including a positive electrode and a negative electrode, and an outer package member housing the electrode assembly.
As outer packaging materials, metal cans and laminate film containers have been put to practical use. The metal can is obtained by deep drawing from a metal plate such as aluminum. In order to manufacture a can by deep drawing, the metal plate needs to have a certain thickness, which hinders the thinning of the outer jacket material and leads to a loss in volume capacity. For example, when an outer can having a thickness of 0.5mm is applied to a battery having a thickness of 13mm, the total thickness of the outer can accounts for approximately 7.7% of the thickness of the battery. Since the battery is thin, the lead in the battery is required to be compactly stored by being bent complicatedly.
In a thin battery, since the outer package is thin, the outer package is easily deformed. The periphery of the terminal portion is easily deformed by decompression sealing or pressurization of the charging/discharging probe. In addition, a sealing failure and a conduction failure during charge and discharge may occur due to the deformation.
Documents of the prior art
Patent document
Patent document 1: international publication No. 2016/204147
Disclosure of Invention
Technical problem to be solved by the invention
The present invention is directed to a battery, a battery pack, an electric storage device, a vehicle, and a flight vehicle, which are less likely to deform in a thin battery.
Means for solving the problems
The battery of an embodiment includes: the flat electrode group comprises a positive electrode, a positive electrode collector lug electrically connected with the positive electrode, a negative electrode and a negative electrode collector lug electrically connected with the negative electrode, wherein the positive electrode collector lug wound into a flat shape is positioned on the first end surface, and the negative electrode collector lug wound into a flat shape is positioned on the second end surface; the electrode group side positive electrode lead is electrically connected with the positive electrode collector lug; an electrode group side negative electrode lead electrically connected to the negative electrode collector tab; an outer package member including a first outer package portion having a flange portion at an opening portion and a second outer package portion in which an electrode group is housed in a space formed by welding the flange portion of the first outer package portion and the second outer package portion; a positive terminal portion having a through-hole on a positive collector tab side, the first exterior packaging portion including: a positive electrode external terminal including a positive electrode head portion and a positive electrode shaft portion extending from the positive electrode head portion; and a positive electrode terminal lead having a through hole and electrically connected to the electrode group side positive electrode lead, wherein the positive electrode head portion protrudes to the outside of the first external packaging portion, the positive electrode shaft portion is inserted into the through hole of the positive electrode terminal lead, and the positive electrode shaft portion is fixed to the first external packaging portion and the positive electrode terminal lead by caulking; a negative terminal portion having a through-hole on a negative collector tab side, the negative terminal portion including: a negative external terminal including a negative head portion and a negative shaft portion extending from the negative head portion; and a negative electrode terminal lead having a through hole and electrically connected to the electrode group side negative electrode lead, the negative electrode head portion protruding to the outside of the first exterior packaging portion, the negative electrode shaft portion being inserted into the through hole of the negative electrode terminal lead, the negative electrode shaft portion being caulked and fixed to the first exterior packaging portion and the negative electrode terminal lead; a first positive electrode insulation reinforcing member disposed on an inner surface side of the first exterior cover part and an inner surface side of the second exterior cover part, and disposed between the positive electrode terminal and the second exterior cover part; and a first negative-electrode insulation reinforcing member disposed on an inner surface side of the first exterior cover portion and an inner surface side of the second exterior cover portion and disposed between the negative electrode terminal and the second exterior cover portion, the first positive-electrode insulation reinforcing member including a positive-electrode insulation reinforcing holding portion having an inclined surface facing an end portion of the positive-electrode shaft portion opposite to the positive-electrode head portion side, the first negative-electrode insulation reinforcing member including a negative-electrode insulation reinforcing holding portion having an inclined surface facing an end portion of the negative-electrode shaft portion opposite to the negative-electrode head portion side.
Drawings
Fig. 1 is a schematic perspective view of a battery according to a first embodiment.
Fig. 2 is an exploded perspective view of the battery shown in fig. 1, as viewed from the positive electrode side.
Fig. 3 is an exploded perspective view of the battery shown in fig. 1, as viewed from the negative electrode side.
Fig. 4 is a perspective view of an electrode assembly of the battery shown in fig. 1.
Fig. 5 is a perspective view showing a state where the electrode group is partially developed.
Fig. 6 is a schematic view seen from the positive electrode terminal side (negative electrode terminal side).
Fig. 7 is a cross-sectional view taken along the plane a-a' on the positive electrode side in fig. 6.
Fig. 8 is a cross-sectional view taken along plane B-B' on the positive electrode side of fig. 6.
Fig. 9 is a cross-sectional view taken along the plane C-C' on the positive electrode side in fig. 6.
Fig. 10 is a cross-sectional view taken along plane D-D' on the positive electrode side in fig. 7.
Fig. 11 is a cross-sectional view taken along the plane a-a' on the negative electrode side of fig. 6.
Fig. 12 is a schematic view for explaining angles of terminals, leads, and slopes.
Fig. 13 is a cross-sectional view taken along the plane a-a' on the positive electrode side in fig. 6 according to a modification.
Fig. 14 is a cross-sectional view taken along the plane a-a' on the positive electrode side in fig. 6 according to a modification.
Fig. 15 is a cross-sectional view taken along the plane B-B' on the positive electrode side in fig. 6 according to a modification.
Fig. 16 is a cross-sectional view taken along the plane C-C' on the positive electrode side in fig. 6 in a modification.
Fig. 17 is a cross-sectional view taken along the plane B-B' on the positive electrode side in fig. 6 in a modification.
Fig. 18 is a cross-sectional view taken along the plane a-a' on the positive electrode side in fig. 6 according to a modification.
Fig. 19 is a cross-sectional view taken along the plane B-B' on the positive electrode side in fig. 6 according to a modification.
Fig. 20 is a diagram showing a battery in which a terminal portion is fixed to the first exterior packaging portion of the battery shown in fig. 1.
Fig. 21 (a) is a plan view of the second exterior packaging member, and fig. 21 (b) is a plan view of the first exterior packaging member.
Fig. 22 (a), (b), (c), and (d) are three views showing the steps of manufacturing the battery according to the first embodiment.
Fig. 23A is a process diagram showing an assembly process of a battery in which a plurality of electrode groups are housed.
Fig. 23B is a process diagram showing an assembly process of a battery in which a plurality of electrode groups are housed.
Fig. 23C is a process diagram showing an assembly process of a battery in which a plurality of electrode groups are housed.
Fig. 24 is a schematic diagram showing a first example of a battery pack according to the second embodiment.
Fig. 25 is a schematic diagram showing a second example of the battery pack according to the second embodiment.
Fig. 26 is a schematic diagram of a power storage device according to a third embodiment.
Fig. 27 is a schematic diagram of a vehicle according to a fourth embodiment.
Fig. 28 is a schematic diagram of the flight vehicle according to the fifth embodiment.
Detailed Description
Hereinafter, embodiments will be described with reference to the drawings. In the embodiments, the same reference numerals are given to the common components, and redundant description is omitted. The drawings are schematic views for facilitating description of the embodiments and understanding thereof, and the shapes, dimensions, ratios, and the like of the drawings differ from each other in actual apparatuses and the like, but they can be appropriately designed and changed with reference to the following description and known techniques.
[ first embodiment ]
A battery according to a first embodiment will be described with reference to fig. 1 to 23. In the drawings, although a part of the components and a part of the components are not shown in the drawings, the positive electrode and the negative electrode are symmetrically configured, and therefore the part of one electrode not shown in the drawings is clear by the structure of the other electrode. In addition, the embodiment recognizes a case where the positive electrode and the negative electrode are configured asymmetrically.
The battery 100 shown in fig. 1 includes an exterior member 1, an electrode group 2, a positive terminal portion 3, a negative terminal portion 4, and an electrolyte (not shown). The battery 100 shown in fig. 1 is, for example, a secondary battery. The battery 100 of the embodiment is thin. The thickness of the thin battery 100 is preferably 5mm to 30mm, and more preferably 5mm to 25 mm.
Fig. 2 is an exploded perspective view of the battery shown in fig. 1, as viewed from the positive electrode side. Fig. 3 is an exploded perspective view of the battery shown in fig. 1, as viewed from the negative electrode side. As shown in fig. 1, 2, and 3, the outer jacket material 1 includes a first outer jacket portion 5 and a second outer jacket portion 6. The first exterior packaging part 5 is a bottomed rectangular tube container, and has a flange part 5b in an opening part 5 a. In the outer jacket material 1, the electrode group 2 is housed in a space formed by welding the flange portion 5b of the first outer jacket portion 5 and the second outer jacket portion 6.
The first exterior packaging part 5 and the second exterior packaging part 6 are preferably made of any one selected from the group consisting of stainless steel, aluminum laminate, and aluminum. In order to increase the battery capacity per unit volume of the battery 100, the thicknesses of the first exterior packaging part 5 and the second exterior packaging part 6, that is, the thicknesses of the first exterior packaging part 5 and the second exterior packaging part 6 are preferably in the range of 0.02mm to 0.3 mm. By setting the range, contradictory properties such as mechanical strength and flexibility can be achieved at the same time. A more preferable range of the plate thickness is 0.05mm to 0.15 mm.
As shown in fig. 1, 2, and 3, a concave portion protruding inward is provided near the center of a corner portion connecting the short side wall and the bottom of the first external packaging member 5, and the bottom of the concave portion is an inclined surface 5 d. The first external packaging member 5 has a depth equal to or less than the size of the opening 5a (the maximum length of the portion having the opening area). More preferably, the first external packaging material 5 has a depth (for example, as shown in fig. 2) equal to or less than the short side of the portion having the opening area. The first external packaging member 5 is, for example, a cup-shaped container having an opening portion formed by shallow drawing from a steel plate. On the other hand, the second exterior packaging part 6 is a lid. The second exterior package portion 6 covers the opening portion of the first exterior package portion 5. The second outer package 6 may be a cup-shaped container manufactured by shallow drawing in the same manner as the first outer package 5, or may be a plate-shaped container. When the second exterior packaging member 6 is a cup-shaped container, the side surface of the second exterior packaging member 6 can be regarded as a part of the side surface of the first exterior packaging member 5. When the second exterior packaging member 6 is a cup-shaped container, the inner surface of the second exterior packaging member 6 on the side surface side can be regarded as a part of the inner surface of the first exterior packaging member 5. The electrode group 2 is housed in a space formed by welding the flange portion 5b of the first exterior case portion 5 to the four sides of the second exterior case portion 6. The welding is, for example, resistance seam welding. Resistance seam welding can achieve high airtightness and heat resistance at lower cost than laser welding.
Fig. 4 is a perspective view of the electrode group 2 of the battery 100 shown in fig. 1. The positive electrode collector tab 7a of the electrode group 2 shown in fig. 4 is electrically connected to the electrode group-side positive electrode lead 12. When the spare positive electrode lead 11 is used, the spare positive electrode lead 11 can be configured to electrically connect the electrode group-side positive electrode lead 12 and the positive electrode collector tab 7a with the spare positive electrode lead 11 interposed therebetween. Similarly, the negative electrode current collector tab 8a of the electrode group 2 shown in fig. 4 is electrically connected to the electrode group-side negative electrode lead 14. When the spare negative electrode lead 13 is used, the spare negative electrode lead 13 may be configured to electrically connect the electrode group-side negative electrode lead 14 and the negative electrode current collector tab 8a with the spare negative electrode lead 13 interposed therebetween.
Since the battery is thin, the space for accommodating the electrode group 2 is a low height space. The height of the outer jacket material 1 (the maximum distance between the first outer jacket portion 5 and the second outer jacket portion 6) is 5mm to 30 mm. Battery 100 is thin, but in order to achieve a high capacity, the thickness of outer package 1 needs to be reduced. When the thickness of the outer jacket material 1 is reduced, the battery is easily deformed, but the battery is difficult to reinforce because the thickness of the battery is reduced. In the embodiment, the positive electrode insulation reinforcing member 24a is provided on the first positive electrode insulation reinforcing member 24 directly below the positive electrode terminal 17, and the negative electrode insulation reinforcing member 37a is provided on the first negative electrode insulation reinforcing member 37 directly below the negative electrode terminal 32, so that the battery 100 is not easily deformed even by external pressure or impact in the thickness direction of the battery 100.
As shown in fig. 5, the electrode group 2 has a flat shape and includes a positive electrode 7, a negative electrode 8, and a separator 9 disposed between the positive electrode 7 and the negative electrode 8. The flat electrode group 2 includes a positive electrode 7, a positive electrode collector tab 7a electrically connected to the positive electrode 7, a negative electrode 8, and a negative electrode collector tab 8a electrically connected to the negative electrode 8, the positive electrode collector tab 7a wound in a flat shape is located on the first end face, and the negative electrode collector tab 8a wound in a flat shape is located on the second end face. One of the flat 2 surfaces of the electrode group 2 (1 surface) faces the bottom surface of the first external packaging member 5, and the other flat 2 surfaces of the electrode group 2 faces the second external packaging member 6.
The positive electrode 7 includes a strip-shaped positive electrode current collector made of, for example, foil, a positive electrode current collector tab 7a made of one end portion of the positive electrode current collector parallel to the long side, and a positive electrode material layer (positive electrode active material-containing layer) 7b formed on the positive electrode current collector except at least a portion of the positive electrode current collector tab 7 a. The positive electrode collector tab 7a is disposed at the center in the width direction of the electrode group 2. The width of the positive electrode collector tab 7a is preferably narrower than the width of the electrode group 2. The width of the positive electrode current collector tab 7a and the width of the electrode group 2 are perpendicular to both the thickness direction of the battery 100 and the depth direction of the battery (the direction from the positive electrode terminal 17 to the negative electrode terminal 32). The positive electrode current collector tab 7a being narrower than the width of the electrode group 2 means that the end of the positive electrode current collector tab 7a in the width direction is notched. From the viewpoint of efficiently housing the current collector 2 in the exterior member 1, the positive electrode current collector tab 7a is notched 5mm or more from both ends, and is more preferably 10mm or more narrower than the width of the electrode group 2. In fig. 2 and the like, both side end portions of the positive electrode collector tab 7a are notched.
On the other hand, the negative electrode 8 includes a strip-shaped negative electrode current collector made of, for example, foil, a negative electrode current collector tab 8a made of one end portion of the negative electrode current collector parallel to the long side, and a negative electrode material layer (negative electrode active material containing layer) 8b formed on the negative electrode current collector except at least a portion of the negative electrode current collector tab 8 a. The width of the negative electrode collector tab 8a is preferably narrower than the width of the electrode group 2. The width of the negative electrode current collector tab 8a and the width of the electrode group 2 are perpendicular to both the thickness direction of the battery 100 and the depth direction of the battery 100 (the direction from the positive electrode terminal 17 toward the negative electrode terminal 32). The negative electrode current collector tab 8a being narrower than the width of the electrode group 2 means that the end of the negative electrode current collector tab 8a in the width direction is notched. From the viewpoint of efficiently housing the electrode group 2 in the outer cover 1, the negative electrode current collector tab 8a is notched 5mm or more from both ends, and is more preferably 10mm or more narrower than the width of the electrode group 2. In fig. 3 and the like, both side end portions of the negative electrode collector tab 8a are notched.
The electrode group 2 is formed by winding the positive electrode 7, the separator 9, and the negative electrode 8 in a flat shape such that the positive electrode material layer 7b of the positive electrode 7 and the negative electrode material layer 8b of the negative electrode 8 face each other with the separator 9 interposed therebetween, the positive electrode collector tab 7a protrudes toward one side of the winding shaft from the negative electrode 8 and the separator 9, and the negative electrode collector tab 8a protrudes toward the other side of the winding shaft from the positive electrode 7 and the separator 9. Therefore, in the electrode group 2, the positive electrode current collector tab 7a wound in a flat spiral shape is positioned on the first end surface perpendicular to the winding axis.
Further, a negative electrode current collector tab 8a wound in a flat spiral shape is positioned on a second end surface perpendicular to the winding axis. The insulating sheet 10 covers a portion between the positive electrode current collector tab 7a and the negative electrode current collector tab 8a in the outermost periphery of the electrode group 2. The insulating sheet 10 also covers a part of the positive electrode current collector tab 7a and the negative electrode current collector tab 8a in the outermost periphery of the electrode group 2. The electrode group 2 holds an electrolyte (not shown).
The spare positive electrode lead 11 is formed by bending a conductive plate into a U shape, and layers of the positive electrode current collector tab 7a are closely attached to each other with portions (near the center) other than the bent portions at both ends of the positive electrode current collector tab 7a interposed therebetween. The electrode group-side positive electrode lead 12 is a conductive plate having a larger area than the spare positive electrode lead 11. The spare positive electrode lead 11 can be omitted. In the case where the spare positive electrode lead 11 is not used, the positive electrode collector tab 7a is directly electrically connected to the electrode group-side positive electrode lead 12.
The spare negative electrode lead 13 is formed by bending a conductive plate into a U shape, and the layers of the negative electrode current collector tab 8a are bonded to each other with portions (near the center) other than the bent portions at both ends of the negative electrode current collector tab 8a interposed therebetween. The electrode group-side negative electrode lead 14 is a conductive plate having a larger area than the spare negative electrode lead 13. The spare negative electrode lead 13 can be omitted. In the case where the spare negative electrode lead 13 is not used, the negative electrode current collector tab 8a is directly electrically connected to the electrode group-side negative electrode lead 14.
Fig. 6 shows a schematic view of battery 100 viewed from the side of positive terminal portion 3 (the side of negative terminal portion 4). The view from the positive terminal portion 3 side is the same as the view from the negative terminal portion 4 side. In FIG. 6, the virtual lines (dashed lines) of A-A ', B-B ', and C-C ' are shown. Fig. 7 and the subsequent cross-sectional views show cross-sectional views of these a-a ', B-B ', and C-C ' planes, that is, cross-sectional views taken in the depth direction of the battery 100 (the direction from the positive terminal portion 3 toward the negative terminal portion 4) from the virtual line.
Fig. 7 is a cross-sectional view taken along the plane a-a' on the positive terminal portion 3 side in fig. 6. The a-a' surface is a cross section passing through the center of the positive electrode terminal 17 (the center of the inclined surface 5 d), and includes the positive electrode insulation reinforcing and holding portion 24 a. Fig. 8 is a cross-sectional view taken along the B-B' plane on the positive terminal portion 3 side in fig. 6. The B-B' surface is a cross section passing outside the positive electrode terminal 17 near the positive electrode terminal 17 and does not include the positive electrode insulation reinforcing and holding portion 24 a. Fig. 9 is a cross-sectional view taken along the plane C-C' on the positive terminal portion 3 side in fig. 6. The C-C' plane is a cross section passing through the first exterior covering 5 at a position close to the end thereof, and is a cross section not including the positive electrode insulation reinforcing and holding portion 24 a. As shown in fig. 7, the inside of the battery 100 of the positive electrode terminal 17 is supported by the positive electrode insulation reinforcing and holding portion 24 a. The positive electrode insulation reinforcing and holding portion 24a prevents the entire battery 100, particularly the positive terminal portion 3 side, from being deformed when a force is applied from the outside of the battery 100.
Fig. 10 is a cross-sectional view taken along the plane D-D' of fig. 7. Fig. 11 is a cross-sectional view taken along the plane a-a' on the negative terminal portion 4 side in fig. 6. The a-a' surface is a cross section passing through the center of the negative electrode terminal 32 (the center of the inclined surface 5 d), and includes the negative electrode insulation reinforcing and holding portion 37 a. As shown in fig. 11, the inside of the battery 100 of the negative terminal 32 is supported by the negative insulation reinforcing and holding portion 37 a. The negative insulation reinforcing and holding portion 37a prevents deformation of the entire battery 100, particularly the negative terminal portion 4 side, when a force is applied from the outside of the battery 100. Since the positive electrode side and the negative electrode side are symmetrical, the cross-sectional views of the B-B ', C-C ', and D-D ' surfaces on the negative electrode side are not shown, but the structure on the negative electrode terminal portion 4 side is understood by referring to fig. 8 to 10 on the positive electrode terminal portion 3 side.
The internal structure of battery 100 will be described below with reference to fig. 2, 3, and 7 to 11.
As shown in fig. 2, 3, and 7 to 10, the electrode group-side positive electrode lead 12 includes: a flat plate portion 12a electrically connected to the positive electrode collector tab 7a on the positive electrode collector tab 7a side, and a first extension portion 12b and a second extension portion 12c extending toward the second exterior cover 6 side. As shown in fig. 8, the first extension portion 12b and the second extension portion 12c are directly and electrically connected to the positive terminal lead 23. Between the first extension portion 12b and the second extension portion 12c, there is a gap 12d where the electrode group-side positive electrode lead 12 does not exist. As shown in fig. 7 and 10, the positive electrode shaft 17b is exposed from the gap 12 d. The electrode group-side positive electrode lead 12 is connected to the surface of the spare positive electrode lead 11 or the positive electrode collector tab 7 a. The spare positive electrode lead 11 is electrically connected to the positive electrode current collector tab 7a and the electrode group-side positive electrode lead 12. The positive electrode collector tab 7a is electrically connected to the electrode group-side positive electrode lead 12.
The positive electrode current collector tab 7a, the spare positive electrode lead 11, and the electrode group-side positive electrode lead 12 are integrated by welding, and the positive electrode 7 is electrically connected to the electrode group-side positive electrode lead 12 via the positive electrode current collector tab 7a and the spare positive electrode lead 11. The welding of the positive electrode collector tab 7a and the spare positive electrode lead 11 is performed by, for example, laser welding or ultrasonic welding. The welding of the spare positive electrode lead 11 and the electrode group-side positive electrode lead 12 is performed by, for example, laser welding or ultrasonic welding. The spare positive electrode lead 11 can be omitted. When the spare positive electrode lead 11 is omitted, the positive electrode current collector tab 7a and the electrode side positive electrode lead 12 are preferably welded.
As shown in fig. 2, 3, and 11, the electrode group-side negative electrode lead 14 includes: a flat plate portion 14a electrically connected to the negative electrode collector tab 8a on the negative electrode collector tab 8a side, a first extending portion 14b and a second extending portion 14c extending toward the second exterior covering portion 6 side. Referring to fig. 8, the first extension portion 14b and the second extension portion 14c are directly and electrically connected with the negative terminal lead 36. Between the first extending portion 14b and the second extending portion 14c, there is a gap 14d where the electrode group-side negative electrode lead 14 does not exist. As shown in fig. 10 and 11 for reference, the positive electrode shaft portion 32b is exposed from the gap 14 d. The electrode group-side negative electrode lead 14 is connected to the surface of the spare negative electrode lead 13 or the negative electrode current collector tab 8 a. The spare negative electrode lead 13 is electrically connected to the negative electrode current collector tab 8a and the electrode group-side negative electrode lead 14. The negative electrode current collector tab 8a is electrically connected to the electrode group-side negative electrode lead 14.
The negative electrode current collector tab 8a, the spare negative electrode lead 13, and the electrode group-side negative electrode lead 14 are integrated by welding, and the negative electrode 8 is electrically connected to the electrode group-side negative electrode lead 14 via the negative electrode current collector tab 8a and the spare negative electrode lead 13. The welding of the negative electrode collector tab 8a and the spare negative electrode lead 13 is performed by, for example, laser welding or ultrasonic welding. The spare negative electrode lead 13 and the electrode group-side negative electrode lead 14 are welded by, for example, laser welding or ultrasonic welding.
As shown in fig. 2, 3, 7, and 10, the positive terminal portion 3 includes a through hole 15 opened to the inclined surface 5d of the first exterior cover 5, a positive electrode outer element 17, a positive electrode insulating member 18a, a positive electrode reinforcing member (annular member) 18b, an insulating gasket 19, and a positive electrode terminal insulating member 20.
In the positive terminal portion 3, the first exterior packaging portion 5 has a through-hole 15 on the positive electrode current collector tab 7a side. The positive terminal 17 of the positive terminal portion 3 includes a positive head portion 17a and a positive shaft portion 17b extending from the positive head portion 17 a. The positive terminal portion 3 includes a positive terminal lead 23 having a through hole 23 e. In the positive terminal portion 3, the positive electrode head portion 17a protrudes outward from the first exterior covering portion 5, the positive electrode shaft portion 17b is inserted into the through hole 23e of the positive electrode terminal lead 23, and the positive electrode shaft portion 17b is swaged and fixed to the first exterior covering portion 5 and the positive electrode terminal lead 23.
As shown in fig. 7, the burring (annular rising portion) 16 extends from the peripheral edge of the through hole 15 toward the inside of the outer jacket material 1 and is formed by burring.
As shown in fig. 7, the positive electrode terminal 17 includes a frustum-shaped positive electrode head portion 17a and a cylindrical positive electrode shaft portion 17b penetrating through the through hole 15 of the first exterior covering 5. The cylindrical positive electrode shaft portion 17b extends from a plane parallel to the top surface of the positive electrode head portion 17 a. The positive electrode external terminal 17 is formed of a conductive material such as aluminum or an aluminum alloy.
The positive electrode insulating member 18a insulates the first exterior packaging part 5 from the positive electrode terminal 17 and the positive electrode terminal lead 23. The positive electrode reinforcing member 18b is sandwiched between the first exterior cover 5 and the positive electrode insulating member 18 a.
The positive electrode reinforcing member 18b is formed of, for example, a circular ring made of a material having higher rigidity than the gasket. Examples of the material having higher rigidity than the gasket include stainless steel, a material plated with iron (e.g., Ni, NiCr, etc.), ceramics, and a resin capable of having higher rigidity than the gasket (e.g., polyphenylene sulfide (PPS), polybutylene terephthalate (PBT)). As shown in fig. 7, the positive electrode reinforcing member 18b is disposed on the outer peripheral surface of the burring 16 and is in contact with the burring 16 and the positive electrode insulating member 18 a. In the case where the positive electrode reinforcing member 18b is formed of an insulating material such as resin or ceramic, it may be integrated with the second positive electrode insulating reinforcing member 25.
The insulating spacer 19 is a cylindrical body (cylindrical portion) having a flange portion 19a at one opening end. As shown in fig. 7, the insulating spacer 19 has a cylindrical body portion inserted into the through hole 15 and the burring portion 16, and a flange portion 19a disposed on the outer periphery of the through hole 15 on the outer surface of the first exterior cladding 5. The insulating spacer 19 is made of a resin such as a fluororesin, a fluororubber, a polyphenylene sulfide resin (PPS resin), a polyether ether ketone resin (PEEK resin), a polypropylene resin (PP resin), and a polybutylene terephthalate resin (PBT resin).
As shown in fig. 2 and 7, the positive electrode terminal insulating member 20 is a plate-like member bent at an obtuse angle, and has a through hole 20a at the bottom. The positive terminal insulating member 20 is disposed on the outer surface of the first exterior package 5. An insulating spacer 19 is inserted into the through hole 20a of the positive electrode terminal insulating member 20.
The positive electrode terminal lead 23 is a conductive plate having a flat plate portion 23a, a first extending portion 23b, a second extending portion 23c, and a third extending portion 23 d. In fig. 8, the positive electrode terminal lead 23 has a flat plate portion 23a on the electrode group 2 side. The first extension portion 23b and the second extension portion 23c extend toward the opening portion side of the first exterior cover 5, i.e., toward the second exterior cover 6. The first extension portion 23b and the second extension portion 23c are located on the second exterior case 6 side and extend in the same direction as the first extension portion 12b and the second extension portion 12c of the electrode group side positive electrode lead 12. The third extending portion 23d extends in a direction along the inclined surface 5 d. A through hole 23e is provided in the center of the third extension portion 23 d.
As shown in fig. 8 to 10, the first extending portion 23b of the positive electrode terminal lead 23 is integrated with the first extending portion 12b of the electrode group-side positive electrode lead 12 by welding. The opposing surfaces of the first extending portion 23b of the positive electrode terminal lead 23 and the first extending portion 12b of the electrode group-side positive electrode lead 12, or/and the end surface of the first extending portion 23b of the positive electrode terminal lead 23 on the tip end side and the end surface of the first extending portion 12b of the electrode group-side positive electrode lead 12 are welded.
As shown in fig. 8 to 10, the second extending portion 23c of the positive electrode terminal lead 23 is integrated with the second extending portion 12c of the electrode group-side positive electrode lead 12 by welding. The opposing surfaces of the second extending portion 23c of the positive electrode terminal lead 23 and the second extending portion 12c of the electrode group-side positive electrode lead 12, and/or the end surface of the second extending portion 23c of the positive electrode terminal lead 23 on the distal end side and the end surface of the second extending portion 12c of the electrode group-side positive electrode lead 12 are welded.
As shown in fig. 8 to 10, the extending direction of at least the distal end portion of the first extending portion 23b of the positive electrode terminal lead 23 and the first extending portion 12b of the electrode group-side positive electrode lead 12 is preferably perpendicular or substantially perpendicular (80 ° to 100 °) to the surface of the second exterior cover 6. The first extending portion 23b of the positive electrode terminal lead 23 and at least the distal end portion of the first extending portion 12b of the electrode group-side positive electrode lead 12 are formed so as to extend in a direction perpendicular or substantially perpendicular to the surface of the second external packaging member 6, and are manufactured without bending the leads after the first extending portion 23b of the positive electrode terminal lead 23 and the first extending portion 12b of the electrode group-side positive electrode lead 12 are welded.
As shown in fig. 8 to 10, the extending direction of at least the distal end portion of the second extending portion 23c of the positive electrode terminal lead 23 and the second extending portion 12c of the electrode group-side positive electrode lead 12 is preferably perpendicular or substantially perpendicular (80 ° to 100 °) to the surface of the second exterior cover 6. The second extending portion 23c of the positive electrode terminal lead 23 and at least the distal end portion of the second extending portion 12c of the electrode group-side positive electrode lead 12 are formed so as to extend in a direction perpendicular or substantially perpendicular to the surface of the second exterior cover 6, and are manufactured without bending the leads after the second extending portion 23c of the positive electrode terminal lead 23 and the second extending portion 12c of the electrode group-side positive electrode lead 12 are welded.
The lead wire is bent after welding, which has an advantage that the wiring at the terminal portion of the electrode can be made compact, but the lead wire is required to be thin in thickness in order to be bent with high accuracy after welding. However, it is not preferable to reduce the thickness of the lead wire because a large current is difficult to flow. By orienting the welded portion in the direction of the surface of the second exterior package 6, the thickness of the lead can be increased.
In consideration of the large current characteristic, the thickness of the positive electrode terminal lead 23 may be 0.5mm to 3.0mm, and the thickness of the electrode group-side positive electrode lead 12 may be 0.5mm to 3.0 mm. Further, considering the bending step of the leads before welding the leads to each other and the large current characteristic, the sum of the thickness of the positive electrode terminal lead 23 and the thickness of the electrode group side positive electrode lead 12 is preferably 1.0mm to 1.2 mm. These thicknesses are preferably satisfied at least in the welded portion.
As shown in fig. 2, 3, and 7 to 10, the first positive electrode insulation reinforcing member 24 has a structure in which a bottomed rectangular tube is divided into halves in the longitudinal direction. The first positive electrode insulation reinforcing member 24 covers the positive electrode current collector tab 7a from the winding center to about half of the second exterior covering portion 6 side, thereby reinforcing the second exterior covering portion 6, particularly in the vicinity of the short side. The first positive electrode insulation reinforcing member 24 is disposed on the inner surface side of the first exterior cover 5 and the inner surface side of the second exterior cover 6, and is disposed between the positive electrode terminal 17 and the second exterior cover 6. The first positive electrode insulation reinforcing member 24 has a positive electrode insulation reinforcing holding portion 24 a. The positive electrode insulation reinforcing and holding portion 24a has a slope facing the end of the positive electrode shaft portion 17b opposite to the positive electrode head portion 17 a. The slope of the positive insulation reinforcing and holding portion 24a supports the positive terminal portion 3, thereby improving the strength of the battery 100. The positive electrode insulation reinforcing and holding portion 24a is a portion extending from the bottom portion 24b of the first positive electrode insulation reinforcing member 24 toward the second exterior case 6 side. The first positive electrode insulation reinforcing member 24 includes a first side surface 24c facing the positive electrode terminal side of the first external packaging member 5 and a second side surface 24d facing the width direction surface of the first external packaging member 5. From the viewpoint of reinforcing the battery 100 on the positive terminal portion 3 side, it is preferable that the surface of the positive electrode shaft portion 17b facing the positive electrode insulation reinforcement holding portion 24a, that is, the surface of the end portion of the positive electrode shaft portion 17b on the side opposite to the positive electrode head portion 17a, be opposed to the inclined surface of the positive electrode insulation reinforcement holding portion 24a, that is, the positive electrode shaft portion 17b of the positive electrode insulation reinforcement holding portion 24a, and be smaller than the surface closest to the positive electrode shaft portion 17 b. When this requirement is satisfied, the positive electrode shaft portion 17 swaged and fixed to the positive electrode terminal lead 23 can be held in contact with the inclined surface of the large-area positive electrode insulation reinforcing and holding portion 24a, whereby the strength of the battery 100 on the positive electrode terminal portion 3 side is improved.
The positive terminal portion 3 preferably further includes a second positive insulation reinforcing member 25. As shown in fig. 2, 3, and 7 to 10, the second positive electrode insulation reinforcing member 25 has a structure in which a bottomed rectangular tube is divided into halves in the longitudinal direction. The second positive electrode insulation reinforcing member 25 is disposed on the inner surface side of the first exterior cover 5, between the positive electrode terminal lead 23 and the first exterior cover 5, and faces the first positive electrode insulation reinforcing member 24.
The second positive electrode insulation reinforcing member 25 includes: a bottom portion 25a facing the bottom portion of the first external packaging member 5, a first side portion 25b facing the side surface (short side wall) of the first external packaging member 5 in the positive electrode terminal direction, an inclined portion 25c connecting the bottom portion 25a and the first side portion 25b and disposed at the center of the second positive electrode insulation reinforcing member 25, a through hole 25d opening at the center of the inclined portion 25c, and a second side portion 25e facing the side surface (long side wall) of the first external packaging member 5 in the width direction. The second positive electrode insulating and reinforcing member 25 covers the corner portion connected from the short-side wall to the bottom surface of the first external packaging member 5 and the corner portion connected from the short-side wall to the long-side surface of the first external packaging member 5. This can reinforce the first external packaging member 5, particularly, the vicinity of the corner where the short-side wall and the long-side wall intersect with the bottom. The through hole 25d communicates with the through hole 15 of the first exterior package portion 5. The positive electrode terminal lead 23 is disposed on the second positive electrode insulation reinforcing member 25. The through hole 23e of the positive electrode terminal lead 23 communicates with the through hole 25d of the second positive electrode insulation reinforcing member 25 and the through hole 15 of the first exterior package 5.
In view of insulation and strength, the second positive electrode insulation reinforcing member 25 is preferably fixed to the positive electrode shaft portion 17b, the first exterior covering portion 5, and the positive electrode terminal lead 23 by caulking and is fixed to the positive electrode terminal portion 3.
The first positive electrode insulation reinforcing member 24 and the second positive electrode insulation reinforcing member 25 are insulating, and preferably are molded resin.
For example, it is preferable that the positive electrode current collector tab 7a is partially wound around the insulating sheet 10, and the insulating sheet 10 on the positive electrode current collector tab 7a side is covered with at least the first positive electrode insulation reinforcing member 24 and the second positive electrode insulation reinforcing member 25, so that the positive electrode current collector tab 7a and the positive electrode terminal 17 in the battery 100 are not short-circuited with the first exterior packaging part 5 and the second exterior packaging part 6. Preferably, the first positive electrode insulation reinforcing member 24 and the second positive electrode insulation reinforcing member 25 cover the inner surface side from the positive electrode terminal 17 of the first exterior covering part 5 and the second exterior covering part 6 to the positive electrode collector tab 7a, so that the positive electrode collector tab 7a and the positive electrode terminal 17 in the battery 100 are not short-circuited with the first exterior covering part 5 and the second exterior covering part 6.
The positive electrode shaft portion 17b of the positive electrode external terminal 17 is inserted into the through hole 20a of the insulating gasket 19 and the positive electrode terminal insulating member 20, the through hole 15 of the first exterior covering portion 5, the through hole 25c of the second positive electrode insulating reinforcing member 25, and the through hole 23e of the positive electrode terminal lead 23, and then is plastically deformed by caulking. As a result, these components are integrated, and the positive electrode external terminal 17 is electrically connected to the positive electrode terminal lead 23. Therefore, the positive electrode external terminal 17 also functions as a rivet. Further, the end face 17b of the positive electrode shaft portion of the positive electrode external terminal 17 may be welded to the boundary portion of the through hole 23e of the positive electrode terminal lead 23 by laser or the like, thereby achieving a stronger connection and an improvement in electrical conductivity.
As shown in fig. 3 and 11, the negative terminal portion 4 includes a through hole 30 opened on the inclined surface 5d of the first exterior package portion 5, a negative terminal 32, a negative insulating member 33a, a negative reinforcing member (annular member) 33b, an insulating gasket 34, and a negative terminal insulating member 35.
In the negative terminal portion 4, the first exterior covering portion 5 has a through-hole 30 on the negative electrode current collector tab 8a side. The negative terminal 32 of the negative terminal portion 4 includes a negative head portion 32a and a negative shaft portion 32b extending from the negative head portion 32 a. The negative terminal portion 4 includes a negative terminal lead 36 having a through hole 36 e. In the negative terminal portion 4, the negative head portion 32a protrudes outward from the first exterior cover 5, the negative shaft portion 32b is inserted into the through hole 36e of the negative terminal lead 36, and the negative shaft portion 32b is fixed by caulking to the first exterior cover 5 and the negative terminal lead 36.
As shown in fig. 11, the burring (annular rising portion) 31 extends from the peripheral edge of the through hole 30 toward the inside of the outer jacket material 1 and is formed by burring.
As shown in fig. 11, the negative electrode terminal 32 includes a truncated pyramid-shaped negative electrode head portion 32a and a columnar negative electrode shaft portion 32b penetrating through the through hole 30 of the first exterior covering portion 5. The cylindrical negative electrode shaft portion 32b extends from a plane parallel to the top surface of the negative electrode head portion 32 a. The negative electrode terminal 32 is formed of a conductive material such as aluminum or an aluminum alloy.
The negative electrode insulating member 33a insulates the first exterior package 5 from the negative electrode terminal 32 and the negative electrode terminal lead 36. The negative electrode reinforcing member 33b is sandwiched between the first exterior packaging part 5 and the negative electrode insulating member 33 a.
The negative electrode reinforcing member 33b is formed of, for example, a circular ring made of a material having higher rigidity than the gasket. Examples of the material having higher rigidity than the gasket include stainless steel, a material plated with iron (e.g., Ni, NiCr, etc.), ceramics, and a resin capable of having higher rigidity than the gasket (e.g., polyphenylene sulfide (PPS), polybutylene terephthalate (PBT)). As shown in fig. 11, the negative electrode reinforcing member 33b is disposed on the outer peripheral surface of the burring 31 and is in contact with the burring 31 and the negative electrode insulating member 33 a. When negative electrode reinforcing member 33b is formed of an insulating material such as resin or ceramic, it may be integrated with first negative electrode insulating reinforcing member 37.
The insulating spacer 34 is a cylindrical body (tube portion) having a flange portion 34a at one opening end. As shown in fig. 3 and 11, the insulating spacer 34 has a cylindrical body portion inserted into the through hole 30 and the burring 31, and a flange portion 34a disposed on the outer periphery of the through hole 30 on the outer surface of the first exterior cladding 5. The insulating spacer 34 is made of a resin such as a fluororesin, a fluororubber, a polyphenylene sulfide resin (PPS resin), a polyether ether ketone resin (PEEK resin), a polypropylene resin (PP resin), and a polybutylene terephthalate resin (PBT resin).
As shown in fig. 3 and 11, the negative electrode terminal insulating member 35 is a plate-like member bent at an obtuse angle, and has a through hole 35a at the bottom. The negative terminal insulating member 35 is disposed on the outer surface of the first exterior package 5. An insulating spacer 34 is inserted into the through hole 35a of the negative terminal insulating member 35.
The negative terminal lead 36 is a conductive plate having a flat plate portion 36a, a first extending portion 36b, a second extending portion 36c, and a third extending portion 36 d. In fig. 11, the negative electrode terminal lead 36 has a flat plate portion 36a on the electrode group 2 side. The first extension 36b and the second extension 36c extend toward the opening side of the first exterior cover 5, i.e., toward the second exterior cover 6. The first extension 36b and the second extension 36c are located on the second exterior case 6 side and extend in the same direction as the first extension 14b and the second extension 14c of the electrode group-side negative electrode lead 14. The third extending portion 36d extends in a direction along the inclined surface 5 d. A through hole 36e is provided in the center of the third extension 36 d.
As shown in fig. 9 to 10 and 11 for reference, the first extending portion 36b of the negative electrode terminal lead 36 and the first extending portion 14b of the electrode group-side negative electrode lead 14 are integrated by welding. The facing surfaces of the first extending portion 36b of the negative electrode terminal lead 36 and the first extending portion 14b of the electrode group-side negative electrode lead 14, and/or the end surface of the first extending portion 36b of the distal-end negative electrode terminal lead 36 and the end surface of the first extending portion 14b of the electrode group-side negative electrode lead 14 are also welded.
As shown in fig. 9 to 10 and 11 for reference, the second extending portion 36c of the negative electrode terminal lead 36 and the second extending portion 14c of the electrode group-side negative electrode lead 14 are integrated by welding. The facing surfaces of the second extending portion 36c of the negative electrode terminal lead 36 and the second extending portion 14c of the electrode group-side negative electrode lead 14, and/or the end surface of the second extending portion 36c of the negative electrode terminal lead 36 on the tip side and the end surface of the second extending portion 14c of the electrode group-side negative electrode lead 14 are welded.
As shown in fig. 9 to 10 and 11 for reference, it is preferable that the extending direction of at least the tip portion of the first extending portion 36b of the negative electrode terminal lead 36 and the first extending portion 14b of the electrode group-side negative electrode lead 14 is perpendicular or substantially perpendicular (80 ° to 100 °) to the surface of the second exterior cover 6. The fact that the extending direction of at least the tip portion of the first extending portion 36b of the negative electrode terminal lead 36 and the first extending portion 14b of the electrode group-side negative electrode lead 14 is perpendicular or substantially perpendicular to the surface of the second exterior cover 6 means that the leads are not bent after the first extending portion 36b of the negative electrode terminal lead 36 and the first extending portion 14b of the electrode group-side negative electrode lead 14 are welded.
As shown in fig. 9 to 10 and 11 for reference, the extending direction of at least the distal end portion of the second extending portion 36c of the negative electrode terminal lead 36 and the second extending portion 14c of the electrode group-side negative electrode lead 14 is preferably perpendicular or substantially perpendicular (80 ° to 100 °) to the surface of the second exterior cover 6. The second extending portion 36c of the negative electrode terminal lead 36 and the extending direction of at least the distal end portion of the second extending portion 14c of the electrode group-side negative electrode lead 14 are perpendicular or substantially perpendicular to the surface of the second exterior cover 6, and the second extending portion 36c of the negative electrode terminal lead 36 and the second extending portion 14c of the electrode group-side negative electrode lead 14 are manufactured without bending the leads after welding.
The lead is bent after welding, which has an advantage that the wiring at the terminal portion of the electrode can be made compact, but the lead is required to be thin in thickness in order to be bent with high accuracy after welding. However, it is not preferable to reduce the thickness of the lead wire in that it is difficult to flow a large current. By orienting the welded portion in the direction of the surface of the second exterior package 6, the thickness of the lead can be increased.
In consideration of the large current characteristics, the thickness of the negative electrode terminal lead 36 may be 0.5mm to 3.0mm, and the thickness of the electrode group-side negative electrode lead 14 may be 0.5mm to 3.0 mm. Further, considering the lead bending step before the welding of the leads and the large current characteristic, the sum of the thickness of the negative electrode terminal lead 36 and the thickness of the electrode group-side negative electrode lead 14 is preferably 1.0mm to 1.2 mm.
As shown in fig. 2, 3, and 11 and fig. 9 to 10 for reference, the first negative electrode insulation reinforcing member 37 has a structure in which a bottomed rectangular tube is divided into halves in the longitudinal direction. The first negative electrode insulation reinforcing member 37 covers the negative electrode current collector tab 8a from the winding center to the second exterior covering portion 6 side by about half, thereby reinforcing the second exterior covering portion 6, particularly in the vicinity of the short side. The first negative electrode insulation reinforcing member 37 is disposed on the inner surface side of the first exterior case 5 and the inner surface side of the second exterior case 6, and is disposed between the negative electrode terminal 32 and the second exterior case 6. The first negative-electrode insulation reinforcing member 37 has a negative-electrode insulation reinforcing holding portion 37 a. The negative electrode insulation reinforcing and holding portion 37a has a slope facing the end of the negative electrode shaft portion 32b opposite to the negative electrode head portion 32 a. The negative terminal portion 3 is supported by the slope of the negative insulation reinforcing and holding portion 37a, thereby improving the strength of the battery 100. The negative electrode insulation reinforcing and holding portion 37a is a portion extending from a bottom portion 37b of the first negative electrode insulation reinforcing member 37 toward the second exterior case 6 side. The first negative electrode insulation reinforcing member 37 includes a first side surface 37c facing the negative electrode terminal side of the first external packaging member 5 and a second side surface 37d facing the width direction surface of the first external packaging member 5. From the viewpoint of reinforcing the battery 100 on the negative terminal portion 4 side, it is preferable that the surface of the negative electrode shaft portion 32b facing the negative electrode insulation reinforcement holding portion 37a, that is, the surface of the end portion of the negative electrode shaft portion 32b on the side opposite to the positive electrode head portion 32a, be opposed to the inclined surface of the negative electrode insulation reinforcement holding portion 37a, that is, the negative electrode shaft portion 32b of the negative electrode insulation reinforcement holding portion 37a, and be smaller than the surface closest to the negative electrode shaft portion 32 b. When this requirement is satisfied, the negative electrode shaft portion 32 swaged and fixed to the negative electrode terminal lead 36 can be held in contact with the inclined surface of the large-area negative electrode insulation reinforcing and holding portion 37a, whereby the strength of the battery 100 on the negative electrode terminal portion 4 side is improved.
The negative terminal portion 3 is preferably further provided with a second negative insulation reinforcing member 38. As shown in fig. 2, 3, and 11 and fig. 9 to 10 for reference, the second negative-electrode insulation reinforcing member 38 has a structure in which a bottomed rectangular tube is divided into halves in the longitudinal direction. The second negative electrode insulation reinforcing member 38 is disposed on the inner surface side of the first exterior cover 5, between the negative electrode terminal lead 36 and the first exterior cover 5, and faces the first negative electrode insulation reinforcing member 37.
The second negative electrode insulation reinforcing member 38 has: a bottom portion 38a facing the bottom portion side of the first external packaging member 5, a first side surface portion 38b facing the side surface (short side wall) side in the negative electrode terminal direction of the first external packaging member 5, an inclined portion 38c connecting the bottom portion 38a and the first side surface portion 38b and disposed at the center of the second negative electrode insulation reinforcing member 38, a through hole 38d opening at the center of the inclined portion 38d, and a second side surface portion 38e facing the side surface (long side wall) side in the width direction of the first external packaging member 5. The second negative electrode insulation reinforcing member 38 covers a corner portion connected from the short-side wall to the bottom surface of the first external packaging member 5 and a corner portion connected from the short-side wall to the long-side surface of the first external packaging member 5. This makes it possible to reinforce the one exterior package portion 5, particularly, the vicinity of the corner where the short-side wall and the long-side wall intersect with the bottom portion. The through hole 38d communicates with the through hole 30 of the first exterior package portion 5. The negative electrode terminal lead 36 is disposed on the second negative electrode insulation reinforcing member 38. The through hole 36e of the negative electrode terminal lead 36 communicates with the through hole 38d of the second negative electrode insulation reinforcing member 38 and the through hole 30 of the first exterior package 5.
In view of insulation and strength, the second negative electrode insulation reinforcing member 38 is preferably fixed to the negative electrode shaft portion 32b, the first exterior covering portion 5, and the negative electrode terminal lead 36 by caulking and is preferably fixed to the negative electrode terminal portion 4.
The first negative electrode insulation reinforcing member 37 and the second negative electrode insulation reinforcing member 38 are preferably insulating and molded resins.
For example, it is preferable that the negative electrode current collector tab 8a is partially wound around the insulating sheet 10, and at least the insulating sheet 10 on the negative electrode current collector tab 8a side is covered with the first negative electrode insulation reinforcing member 37 and the second negative electrode insulation reinforcing member 38, so that the negative electrode current collector tab 8a and the positive electrode terminal 17 in the battery 100 are not short-circuited with the first exterior packaging part 5 and the second exterior packaging part 6. Further, it is preferable that the first exterior packaging part 5 and the second exterior packaging part 6 are configured such that the inner surface side between the negative electrode terminal 32 and the negative electrode collector tab 8a is covered with the first negative electrode insulation reinforcing member 37 and the second negative electrode insulation reinforcing member 38, thereby preventing the negative electrode collector tab 8a and the negative electrode terminal 32 in the battery 100 from being short-circuited with the first exterior packaging part 5 and the second exterior packaging part 6.
The negative electrode shaft portion 32b of the negative electrode terminal 32 is inserted into the insulating gasket 34, the through hole 35a of the negative electrode insulating member 35, the through hole 30 of the first exterior covering portion 5, the through hole 37c of the first negative electrode insulating reinforcing member 37, and the through hole 36e of the negative electrode terminal lead 36, and then is plastically deformed by caulking. As a result, these components are integrated, and the negative electrode terminal 32 is electrically connected to the negative electrode terminal lead 36. Therefore, the negative terminal 32 also functions as a rivet. Further, the end face 32b of the negative electrode shaft portion of the negative electrode terminal 32 may be welded to the boundary portion of the through hole 36e of the negative electrode terminal lead 36 by laser or the like, thereby achieving a stronger connection and an improvement in electrical conductivity.
The spare positive electrode terminal lead 11, the electrode group-side positive electrode lead 12, the positive electrode terminal lead 23, the spare negative electrode terminal lead 13, the electrode group-side negative electrode lead 14, and the negative electrode terminal lead 36 may be formed of, for example, aluminum or an aluminum alloy material. In order to reduce the contact resistance, the material of the lead is preferably the same as that of the positive electrode collector or the negative electrode collector that can be electrically connected to the lead.
The positive electrode insulating member 18a, the first positive electrode insulating reinforcing member 24, the second positive electrode insulating reinforcing member 25, the negative electrode insulating member 33a, the first negative electrode terminal insulating reinforcing member 37, and the second negative electrode insulating reinforcing member 38 are formed of, for example, 1 or more thermoplastic resins selected from the group consisting of tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), polypropylene (PP), Polyethylene (PE), polyethylene terephthalate (PET), Polytetrafluoroethylene (PTFE), Polyphenylene Sulfide (PPs), polyether ether ketone (PEEK), and the like.
The electrode group 2 is housed in the first exterior covering portion 5 such that the positive electrode collector tab 7a faces the positive electrode terminal portion 3 and the negative electrode collector tab 8a faces the negative electrode terminal portion 4. Therefore, a plane intersecting the positive electrode collector tab 7a and the negative electrode collector tab 8a of the electrode group 2 faces the bottom surface 5c in the first exterior covering member 5, and a curved surface intersecting the positive electrode collector tab 7a and the negative electrode collector tab 8a faces the long-side surface in the first exterior covering member 5.
By providing the positive electrode insulation reinforcement holding portion 24a and the negative electrode insulation reinforcement holding portion 37a as in the embodiment, the strength of the battery 100 is improved. In the battery 100 having improved strength, the displacement of the battery 100 when a load of 10N is applied to the positive electrode terminal or the negative electrode terminal from the first exterior covering part 5 toward the second exterior covering part 6 is less than 1.0 mm. Therefore, the reliability of battery 100 is improved even under severe environments.
Next, the angle, distance, and the like between the positive electrode terminal 17 (negative electrode terminal 32) and the positive electrode insulation reinforcement holding portion 24a (negative electrode insulation reinforcement holding portion 37a) will be described with reference to fig. 12. Fig. 12 is a schematic view for explaining angles of terminals, leads, and slopes. Since the positive electrode side and the negative electrode side are the same, the positive electrode side will be mainly described.
If the inclined surface of the positive electrode insulation reinforcement holding portion 24a facing the end portion of the positive electrode shaft portion 17b opposite to the positive electrode head portion 17a is parallel or substantially parallel to the end portion of the positive electrode shaft portion 17b opposite to the positive electrode head portion 17a facing the inclined surface, the deformation of the battery 100 due to external pressure can be further prevented. Therefore, when the angle formed by the surface of the positive electrode shaft portion 17a facing the inclined surface of the positive electrode insulation reinforcement holding portion 24a and the second casing portion 6 is a1, the angle formed by the inclined surface of the positive electrode insulation reinforcement holding portion 24a and the second casing portion 6 is a2, the angle formed by the surface of the negative electrode shaft portion 32B facing the inclined surface of the negative electrode insulation reinforcement holding portion 37a and the second casing portion 6 is B1, and the angle formed by the inclined surface of the negative electrode insulation reinforcement holding portion 37a and the second casing portion 6 is B2, it is preferable that | a1-a2| ≦ 8 degrees and | B1-B2| ≦ 8 degrees are satisfied. When this relationship is satisfied, the difference in angle between the end portions of the positive electrode shaft portion 17b opposite to the positive electrode head portion 17a, which end portions face the inclined surface, is small, and therefore external pressure can be received by the entire inclined surface. From this viewpoint, | A1-A2| ≦ 5 degrees and | B1-B2| ≦ 5 degrees are more preferably satisfied.
The angle a1 formed by the surface of the positive electrode shaft 17a facing the inclined surface of the positive electrode insulation reinforcement holding portion 24a and the second exterior packaging portion 6, and the angle a2 formed by the inclined surface of the positive electrode insulation reinforcement holding portion 24a and the second exterior packaging portion 6 are obtained by using the virtual lines L1 to L5 in fig. 12. The angle is determined by performing a ct (computed tomography) inspection using X-rays on a cross section of the center of the battery 100 as shown in fig. 7 including the positive electrode shaft portion 17a and the positive electrode insulation reinforcing and holding portion 24 a.
The virtual line L1 is a line along the bottom surface of the second exterior package portion 6. The virtual line L2 is a line passing through 2 points (X1 and X2) where the third extension 23d of the positive electrode terminal lead 23 contacts the positive electrode shaft portion 17 b. An intersection of a perpendicular line L3 from a virtual line L2 passing through the contact point X1 and the positive electrode insulation reinforcing and holding portion 24a is defined as Y1. An intersection of a perpendicular line L4 from a virtual line L2 passing through the contact point X2 and the positive electrode insulation reinforcing and holding portion 24a is defined as Y2. The line passing through Y1 and Y2 is defined as a virtual line L5. The angle a1 between the surface of the positive electrode shaft 17a facing the inclined surface of the positive electrode insulation reinforcing and holding portion 24a and the second exterior packaging member 6 is the angle between the virtual line L1 and the virtual line L2. The angle a2 formed by the slope of the positive electrode insulation reinforcing and holding portion 24a and the second exterior cover 6 is the angle formed by the virtual line L1 and the virtual line L2.
The angle B1 formed by the surface of the negative electrode shaft 32B facing the inclined surface of the negative electrode insulation reinforcing and holding portion 37a and the second exterior packaging member 6, and the angle B2 formed by the inclined surface of the negative electrode insulation reinforcing and holding portion 37a and the second exterior packaging member 6 were also obtained in the same manner.
If the distance between the slope of the positive electrode insulation reinforcement holding portion 24a and the positive electrode shaft portion 17b is long, the impact when the positive electrode insulation reinforcement holding portion 24a and the positive electrode shaft portion 17b come into contact is likely to be large, and the effect of improving the strength of the battery 100 is small. Therefore, the distance between the slope of the positive electrode insulation reinforcing and holding portion 24a and the positive electrode shaft portion 17b is preferably 0.0mm to 1.0 mm. Similarly, the distance between the slope of the negative electrode insulation reinforcing and holding portion 37a and the negative electrode shaft portion 32b is preferably 0.0mm to 1.0 mm.
The distance between the slope of the positive electrode insulation reinforcing and holding portion 24a and the positive electrode shaft portion 17b is determined from the average value of the distance between X1 and Y1 and the distance between X2 and Y2. The distance between the slope of the negative insulation reinforcement holder 37a and the negative shaft 32b is also determined from the average of the distance between X1 and Y1 and the distance between X2 and Y2.
In order to further effectively increase the strength of the positive electrode insulation reinforcing and holding portion 24a, the inclined surface of the positive electrode insulation reinforcing and holding portion 24a is preferably a wide inclined surface and also faces the positive electrode terminal lead 23 (third extending portion 23 d). Similarly, the slope of the negative insulation reinforcement holder 37a is preferably a wide slope, and faces the negative terminal lead 36 (third extension 23 d).
If the distance between the slope of the positive electrode insulation reinforcement holding portion 24a and the positive electrode terminal lead 23 is long, the impact when the positive electrode insulation reinforcement holding portion 24a and the positive electrode terminal lead 23 come into contact is likely to increase, and therefore the effect of improving the strength of the battery 100 is reduced. Therefore, the distance between the slope of the positive insulation reinforcing and holding portion 24a and the positive terminal lead 23 is preferably 0.0mm to 1.0 mm. Similarly, the distance between the slope of the negative insulation reinforcement holder 37a and the negative terminal lead 36 is preferably 0.0mm to 1.0 mm.
The distance between the slope of the positive electrode insulation reinforcement holding portion 24a and the positive electrode terminal lead 23 is determined from the average value of the distance between the Y1 and the intersection of the virtual line L3 and the positive electrode insulation reinforcement holding portion 24a of the positive electrode terminal lead 23, and the distance between the Y2 and the intersection of the virtual line L4 and the positive electrode insulation reinforcement holding portion 24a of the positive electrode terminal lead 23. Similarly, the distance between the slope of the negative insulation reinforcement holder 37a and the negative terminal lead 36 is determined from the average value of the distance between the intersection of the virtual line L3 and the negative insulation reinforcement holder 37a of the negative terminal lead 36 and Y1, and the distance between the intersection of the virtual line L4 and the negative insulation reinforcement holder 37a of the negative terminal lead 36 and Y2.
At the corner portion connecting the short side wall and the bottom of the first exterior covering portion 5, a gap is formed between the electrode group 2 and the positive electrode current collector tab 7a, and between the electrode group 2 and the negative electrode current collector tab 8 a. By providing a concave portion protruding inward at a corner portion connecting the short side wall and the bottom of the first external packaging member 5 and providing the bottom of the concave portion as the inclined surface 5d, the dead space in the first external packaging member 5 is reduced, and therefore the volumetric energy density of the battery can be improved. Further, by disposing the positive terminal portion 3 and the negative terminal portion 4 on the inclined surface 5d, the area for disposing the terminal portions can be increased as compared with the case where the positive terminal portion 3 and the negative terminal portion 4 are disposed on the short-side surface having no inclined surface. Therefore, the diameters of the positive electrode shaft portion 17b of the positive electrode terminal 17 and the negative electrode shaft portion 32b of the negative electrode terminal 32 can be increased, and thus a large current (high-rate current) can be passed with low resistance.
As a result of housing the electrode group 2 in the first exterior package part 5, the positive electrode collector tab 7a is covered by a bottomed rectangular cylindrical cover formed by the lower end of the second positive electrode insulating and reinforcing member 25 being in contact with the upper end of the first positive electrode insulating and reinforcing member 24. The negative electrode collector tab 8a is covered by a bottomed rectangular cylindrical cover formed by the lower end of the second negative electrode insulation reinforcing member 38 being in contact with the upper end of the first negative electrode insulation reinforcing member 37.
The second exterior package portion 6 functions as a cover of the first exterior package portion 5. The flange portion 5b of the first exterior package portion 5 and the four sides of the second exterior package portion 6 are welded, whereby the electrode group 2 is sealed in the exterior member 1.
The battery shown in fig. 1 to 11 described above preferably includes an outer jacket material that houses the electrode group in a space formed by welding the first outer jacket portion having the flange portion at the opening portion and the second outer jacket portion. By providing the positive electrode insulation reinforcing and holding portion 24a and the negative electrode insulation reinforcing and holding portion 37a, high strength can be maintained even when the first exterior cover portion and the second exterior cover portion are made thin. As a result, since the flexibility of the outer jacket material can be improved, the electrode group 2 can be easily restrained by pressure reduction sealing, application of a load from the outside of the outer jacket material 1, or the like. This stabilizes the inter-electrode distance of the electrode group 2, reduces the resistance, and facilitates the realization of a battery pack having vibration resistance and impact resistance. Further, if the first exterior cover 5 and the second exterior cover 6 have high flexibility, the distance from the inner surfaces of the first and second exterior covers to the electrode group 2 can be easily shortened, and therefore, the heat dissipation of the battery can be improved.
The first exterior cover 5 and the second exterior cover 6 made of stainless steel are easy to weld and can be sealed by inexpensive resistance seam welding. Therefore, the outer jacket material 1 having a gas tightness higher than that of the laminated film container can be realized at low cost. In addition, the heat resistance of outer jacket material 1 can be improved. For example, SUS304 has a melting point of 1400 ℃ and Al has a melting point of 650 ℃.
Further, the shaft portion of the external terminal is swaged and fixed to the through hole, and as a result, plastic deformation occurs. As a result, although a force is applied in the radial direction of the insulating spacer, since the burring part is reinforced by the annular member disposed outside the burring part, a compressive stress is generated in the insulating spacer, and the external terminal can be connected to the first external packaging part 5 with high strength. Even if the plate thickness of the first external packaging member 5, that is, the plate thickness of the flange portion is reduced, the flange portion can be reinforced by the annular member, and therefore, the external terminal can be connected to the first external packaging member 5 with high strength regardless of the plate thickness of the first external packaging member 5. Further, since the burring extends from the edge of the through hole toward the inside of the outer jacket material 1, liquid leakage when the internal pressure of the outer jacket material 1 rises due to gas generation or the like can be suppressed by the action of external pressure. Therefore, high reliability can be achieved even when the first exterior cover 5 and the second exterior cover 6 are made thin.
Therefore, according to the battery of the first embodiment, since high strength and reliability can be obtained even when the thicknesses of the first exterior cover portion 5 and the second exterior cover portion 6 are made thin, the battery having excellent flexibility and heat dissipation properties and high strength and reliability can be provided.
If the first external packaging member 5 has a depth equal to or less than the maximum length of the opening, the area of the opening of the first external packaging member 5 increases. The second exterior cover is welded to the four sides of the first exterior cover, but if the opening area is increased, the length of the welded side is increased, and therefore, it becomes easy to weld the three sides first and inject the electrolyte from the gap of the remaining side. Further, since the outer jacket material 1 can be temporarily sealed by providing a portion having a lower welding strength than the other portions, a member for temporary sealing (for example, a rubber plug) can be eliminated. Further, since the outer jacket material 1 has a flat shape, the heat dissipation performance of the battery can be improved.
The first external packaging member 5 includes a concave portion having an inclined surface 5d, and a terminal portion is disposed on the inclined surface 5d, whereby a dead space in the first external packaging member 5 can be reduced.
The inclined surface 5d is not limited to being provided near the center of the short side of the outer jacket material 1, and may extend over the entire short side of the outer jacket material.
The end surface of the head portion of the electrode terminal has a quadrangular top surface, and a first inclined surface and a second inclined surface connected to two opposite sides of the top surface, so that the welding direction can be changed by selecting any one of the three surfaces as a welding surface. In addition, the shaft portion of the electrode terminal has a stepped inclined surface, so that the electrode terminal is firmly fixed.
The difference (thickness) between the outer shape and the inner diameter of the positive terminal portion 3, the negative terminal portion 4, or both of the annular members is preferably equal to or greater than the thickness of the first exterior packaging portion 5. Thus, the external terminal can be connected to the first exterior packaging part 5 with high strength regardless of the thickness of the first exterior packaging part 5. Specifically, the shortest thickness can be 0.1mm or more.
The outer shape of the annular member does not necessarily have to be the same shape as the cross-sectional shape of the cuff, and may be a polyhedron such as a rectangle or a hexagon, or may be a complex shape of one or more curved lines and one or more straight lines.
As the second exterior package portion 6, a flat plate as illustrated in fig. 5 and 6 may be used, but a flat plate having a flange portion at an opening portion may be used instead of the flat plate. An example of such a structure is the same as the first exterior package portion 5.
The spare positive electrode lead 11 and the spare negative electrode lead 13 are not limited to the U-shaped conductive plates, and conductive flat plates may be used. Alternatively, the spare positive electrode lead 11 or the spare negative electrode lead 13 or both of them may not be used.
The outer jacket material 1 may further include a safety valve or the like that can release the pressure inside the battery when the internal pressure of the battery increases to a predetermined value or more.
The battery 100 of the first embodiment may be a primary battery or may be a secondary battery. As an example of the battery 100 of the first embodiment, a lithium ion secondary battery is exemplified.
Hereinafter, the positive electrode 7, the negative electrode 8, the separator 9, and the electrolyte of the battery 100 according to the first embodiment will be described.
1) Positive electrode 7
The positive electrode 7 can include, for example, a positive electrode current collector, a positive electrode material layer held by the positive electrode current collector, and a positive electrode current collector tab 7 a. The positive electrode material layer can contain, for example, a positive electrode active material, a conductive agent, and a binder.
As the positive electrode active material, for example, an oxide or a sulfide can be used. Examples of the oxide and sulfide include lithium-intercalated manganese dioxide (MnO)2) Iron oxide, copper oxide, nickel oxide, lithium manganese composite oxide (e.g., Li)xMn2O4Or LixMnO2) Lithium nickel composite oxide (e.g., Li)xNiO2) Lithium cobalt composite oxide (e.g., Li)xCoO2) Lithium nickel cobalt complex oxide (e.g., LiNi)1-yCoyO2) Lithium manganese cobalt composite oxide (e.g., Li)xMnyCo1-yO2) Lithium manganese nickel composite oxide having spinel structure (e.g., Li)xMn2-yNiyO4) Lithium phosphorus oxide having olivine structure (e.g. Li)xFePO4、LixFe1- yMnyPO4、LixCoPO4) Iron (Fe) sulfate2(SO4)3) Vanadium oxide (e.g. V)2O5) And lithium nickel cobalt manganese composite oxides. In the formula, x is more than 0 and less than or equal to 1, and y is more than 0 and less than or equal to 1. These compounds may be used alone or in combination as an active material.
The binder is blended to bind the active material to the current collector. Examples of the binder include Polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVdF), and fluorine-based rubber.
The conductive agent is blended as necessary to improve the current collecting performance and to suppress the contact resistance between the active material and the current collector. Examples of the conductive agent include carbonaceous materials such as acetylene black, carbon black, and graphite.
In the positive electrode material layer, the positive electrode active material and the binder are preferably blended in a proportion of 80 mass% to 98 mass% and 2 mass% to 20 mass%, respectively.
By setting the amount of the binder to 2% by mass or more, sufficient electrode strength can be obtained. Further, by setting the content to 20 mass% or less, the amount of the insulating material of the electrode can be reduced, and the internal resistance can be reduced.
When the conductive agent is added, the positive electrode active material, the binder, and the conductive agent are preferably blended in a proportion of 77 mass% to 95 mass%, 2 mass% to 20 mass%, and 3 mass% to 15 mass%, respectively. The above-described effects can be exhibited by setting the amount of the conductive agent to 3 mass% or more. Further, by setting the content to 15% by mass or less, the decomposition of the nonaqueous electrolyte on the surface of the positive electrode conductive agent during high-temperature storage can be reduced.
The positive electrode current collector is preferably an aluminum foil or an aluminum alloy foil containing at least 1 element selected from Mg, Ti, Zn, Ni, Cr, Mn, Fe, Cu, and Si.
The positive electrode current collector is preferably integrated with a positive electrode current collector tab. Alternatively, the positive electrode current collector may be separate from the positive electrode current collector tab.
2) Negative electrode 8
The negative electrode 8 can include, for example, a negative electrode current collector, a negative electrode material layer held by the negative electrode current collector, and a negative electrode current collector tab 8 a. The negative electrode material layer may contain, for example, a negative electrode active material, a conductive agent, and a binder.
As the negative electrode active material, for example, a metal oxide, a metal nitride, an alloy, carbon, or the like capable of inserting and extracting lithium ions can be used. It is preferable to use a catalyst capable of being at least 0.4V (for Li/Li)+) A material which is capable of intercalating and deintercalating lithium ions at a high potential of (3) is used as the negative electrode active material.
Examples of the negative electrode active material include a graphite material, a carbonaceous material (e.g., graphite, coke, carbon fiber, spherical carbon, a thermally decomposed gaseous carbonaceous material, a resin-fired material, etc.), a chalcogen compound (e.g., titanium disulfide, molybdenum disulfide, niobium selenide, etc.), a light metal (e.g., aluminum alloy, magnesium alloy, lithium alloy, etc.), and Li4+xTi5O12(x varies in the range of-1. ltoreq. x. ltoreq.3 depending on charge-discharge reaction) and spinel-type lithium titanate and ramsdellite-type Li2+xTi3O7(x varies in the range of-1. ltoreq. x. ltoreq.3 depending on charge-discharge reaction), a metal composite oxide containing Ti and at least 1 element selected from the group consisting of P, V, Sn, Cu, Ni and Fe, a niobium-titanium composite oxide, and the like.
Examples of the metal composite oxide containing Ti and at least 1 element selected from the group consisting of P, V, Sn, Cu, Ni and Fe include TiO2-P2O5、TiO2-V2O5、TiO2-P2O5-SnO2、TiO2-P2O5MO (M is at least 1 element selected from Cu, Ni and Fe). These metal composite oxides are intercalated with lithium by charging, and thereby changed into lithium titanium composite oxides. Preferably 1 or more of the group consisting of lithium titanium oxide (e.g., spinel-type lithium titanate), silicon, tin, and the like. The binder of the negative electrode active material layer is the same as that of the positive electrode active material layer. Conductive material of negative electrode active material layer and positive electrode active material layerThe conductive agents are the same.
As the niobium-containing titanium composite oxide, for example, a compound having the general formula LiaTiMbNb2±βO7±σ(wherein each subscript has a value of 0. ltoreq. a.ltoreq.5, 0. ltoreq. b.ltoreq.0.3, 0. ltoreq. beta.ltoreq.0.3, 0. ltoreq. sigma.ltoreq.0.3, M is a monoclinic crystal structure represented by at least 1 (may be 1 or may be plural) selected from the group consisting of Fe, V, Mo and Ta), or a compound oxide having a crystal structure represented by the general formula Li2+a1M(I)2-b1Ti6-c1M(II)d1O14+σ1(wherein each subscript has a value of 0. ltoreq. a 1. ltoreq.6, 0. ltoreq. b 1. ltoreq.2, 0. ltoreq. c 1. ltoreq.6, 0. ltoreq. d 1. ltoreq.6, and-0.5. ltoreq. sigma.1. ltoreq.0.5, M (I) is at least 1 kind (may be 1 kind or may be plural kinds) selected from the group consisting of Sr, Ba, Ca, Mg, Na, Cs and K, and M (II) is at least 1 kind (may be 1 kind or may be plural kinds) selected from the group consisting of Zr, Sn, V, Nb, Ta, Mo, W, Fe, Co, Mn and Al, and comprises a composite oxide of an orthorhombic crystal structure represented by Nb). In the above general formula Li2+a1M(I)2-b1Ti6-c1M(II)d1O14+σ1Wherein each subscript has a value of 0. ltoreq. a 1. ltoreq.6, 0. ltoreq. b 1. ltoreq.2, 0. ltoreq. c 1. ltoreq.6, 0. ltoreq. d 1. ltoreq.6, and-0.5. ltoreq. sigma.1. ltoreq.0.5, M (I) is at least 1 kind (may be 1 kind or may be plural kinds) selected from the group consisting of Sr, Ba, Ca, Mg, Na, Cs and K, and M (II) is Nb, or is a combination of Nb and at least 1 kind (may be 1 kind or may be plural kinds) selected from the group consisting of Zr, Sn, V, Ta, Mo, W, Fe, Co, Mn and Al. In particular, the monoclinic niobium-titanium composite oxide is more preferable because the capacity per unit weight is large and the battery capacity can be improved.
The conductive agent is added to improve the current collecting performance and suppress the contact resistance between the negative electrode active material and the current collector. Examples of the conductive agent include carbonaceous materials such as acetylene black, carbon black, and graphite.
The binder is added to fill the gaps between the dispersed negative electrode active material and to bind the negative electrode active material to the current collector. Examples of the binder include Polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVdF), fluorine-based rubber, and styrene butadiene rubber.
The active material, the conductive agent, and the binder in the negative electrode material layer are preferably blended in a proportion of 68 mass% to 96 mass%, 2 mass% to 30 mass%, and 2 mass% to 30 mass%, respectively. By setting the amount of the conductive agent to 2 mass% or more, the current collecting performance of the negative electrode layer can be improved. In addition, by setting the amount of the binder to 2% by mass or more, the adhesion between the negative electrode material layer and the current collector can be sufficiently expressed, and excellent cycle characteristics can be expected. On the other hand, in order to increase the capacity, it is preferable that the conductive agent and the binder are each 28 mass% or less.
As the current collector, a material electrochemically stable at the insertion potential and the extraction potential of lithium of the negative electrode active material is used. The current collector is preferably made of an aluminum alloy containing at least 1 element selected from copper, nickel, stainless steel, aluminum, or Mg, Ti, Zn, Mn, Fe, Cu, and Si. The thickness of the current collector is preferably in the range of 5 to 20 μm. The current collector having such a thickness can balance the strength and weight of the negative electrode.
The negative electrode current collector is preferably integrated with the negative electrode current collector tab 8 a. Alternatively, the negative electrode current collector may be separate from the negative electrode current collector tab 8 a.
The negative electrode 8 is produced, for example, by the following processes: the negative electrode active material, the binder, and the conductive agent are suspended in a common solvent to prepare a slurry, and the slurry is applied to a current collector and dried to form a negative electrode material layer, followed by pressing. The negative electrode may be produced by forming the negative electrode active material, the binder, and the conductive agent into a particulate form as a negative electrode material layer and disposing the negative electrode material layer on the current collector.
3) Diaphragm 9
Is a porous thin insulating film. The separator 9 includes a nonwoven fabric, a film, paper, an inorganic particle layer, and the like, each of which is made of a resin ultrathin nanofiber film. Examples of the material constituting the separator 9 include polyolefins such as polyethylene and polypropylene, cellulose, polyester, polyvinyl alcohol, polyimide, polyamide, polyamideimide, polytetrafluoroethylene, and vinylon. Examples of the separator 9 that are preferable from the viewpoint of the thinness and the mechanical strength include a nonwoven fabric containing cellulose fibers. The inorganic particle layer contains oxide particles, a thickener, and a binder. As the oxide particles, metal oxides such as aluminum oxide, titanium oxide, magnesium oxide, zinc oxide, and barium sulfate can be used. Carboxymethyl cellulose can be used as the thickener. As the binder, methyl acrylate or an acrylic copolymer containing the same, Styrene Butadiene Rubber (SBR), or the like can be used. The insulating sheet 10 may be made of nonwoven fabric, film, or paper, as in the case of the separator 9. The insulating sheet 10 is preferably further fixed with an unillustrated tape.
4) Electrolyte
The electrolyte is preferably a solution containing an electrolyte salt and a nonaqueous solvent, a nonaqueous gel-like electrolyte in which a polymer material is combined with a solution containing an electrolyte salt and a nonaqueous solvent, a solution containing an electrolyte salt and water, or an aqueous gel-like electrolyte in which a polymer material is combined with a solution containing an electrolyte salt and water.
The electrolyte salt contained in the nonaqueous solution can be LiPF, for example6、LiBF4、Li(CF3SO2)2N (lithium bistrifluoromethanesulfonamide; commonly known as LiTFSI), LiCF3SO3(generic name LiTFS), Li (C)2F5SO2)2N (lithium bis-pentafluoroethanesulfonyl amide; commonly known as LiBETI), LiClO4、LiAsF6、LiSbF6、LiB(C2O4)2(lithium bis (oxalato) borate; commonly known as LiBOB), difluoro (trifluoro-2-oxide-2-trifluoro-methylpropanesulfonic acid (2-) -0, 0), LiBF2OCOOC(CF3)2(lithium borate; commonly known as LiBF)2(HHIB)). These electrolyte salts may be used alone or in combination of two or more. Particularly preferred is LiPF6、LiBF4. The lithium salt can use a supporting salt that conducts electricity to ions. For example, lithium hexafluorophosphate (LiPF) is exemplified6) Lithium tetrafluoroborate, imide-based supporting salts, and the like. The lithium salt may contain 1 or 2 or more species.
The concentration of the nonaqueous electrolyte salt is preferably in the range of 0.5mol/L to 3mol/L, more preferably in the range of 0.7mol/L to 2 mol/L. By defining the electrolyte concentration in this manner, the performance when a high load current flows can be further improved while suppressing the influence of an increase in viscosity due to an increase in the electrolyte salt concentration.
The nonaqueous solvent is not particularly limited, and for example, cyclic carbonates such as Propylene Carbonate (PC) and Ethylene Carbonate (EC), chain carbonates such as diethyl carbonate (DEC), dimethyl carbonate (DMC), methylethyl carbonate (MEC) and dipropyl carbonate (DPC), 1, 2-Dimethoxyethane (DME), γ -butyrolactone (GBL), Tetrahydrofuran (THF), 2-methyltetrahydrofuran (2-MeHF), 1, 3-dioxolane, sulfolane and Acetonitrile (AN) can be used. These solvents may be used alone or in combination of two or more. The nonaqueous solvent containing a cyclic carbonate and/or a chain carbonate is preferable. Examples of the polymer material contained in the nonaqueous gel electrolyte include polyvinylidene fluoride (PVdF), Polyacrylonitrile (PAN), polyethylene oxide (PEO), and polymethacrylate.
Examples of the electrolyte salt contained in the aqueous solution include LiCl, LiBr, LiOH and Li2SO4、LiNO3、LiN(SO2CF3)2(trifluoromethanesulfonylamide; commonly known as LiTFSA), Li N (SO)2C2F5)2(bis (pentafluoroethanesulfonyl) amide; commonly known as LiBETA), LiN (SO)2F)2(bis-fluorosulfonyl amide; commonly known as LiFSA), LiB [ (OCO)2]2And the like. The kind of the lithium salt to be used may be 1 kind or 2 or more kinds. Examples of the polymer material contained in the aqueous gel electrolyte include polyvinylidene fluoride (PVdF), Polyacrylonitrile (PAN), polyethylene oxide (PEO), and polymethacrylate.
The concentration of the aqueous electrolyte salt is preferably 1mol/L to 12mol/L, and more preferably 112mol/L to 10 mol/L. LiOH and Li may be added to suppress electrolysis of the electrolyte2SO4And adjusting the pH value. The pH is preferably 3 to 13, more preferably pH4 to 12 inclusive.
Alternatively, as the nonaqueous electrolyte, an ambient temperature molten salt (ionic melt) containing lithium ions, a polymer solid electrolyte, an inorganic solid electrolyte, or the like may be used.
The normal temperature molten salt (ionic melt) is a compound that can exist as a liquid at normal temperature (15 to 25 ℃) in an organic salt composed of a combination of organic cations and anions. The ambient temperature molten salt includes an ambient temperature molten salt in which a monomer exists as a liquid, an ambient temperature molten salt which becomes a liquid by being mixed with an electrolyte, and an ambient temperature molten salt which becomes a liquid by being dissolved in an organic solvent. The melting point of the ambient temperature molten salt used for the nonaqueous electrolyte battery is usually 25 ℃ or lower. In addition, the organic cation typically has a 4-stage ammonium backbone.
Fig. 13 shows a positive electrode portion of a battery 101 according to a modification of the battery 100 of the first embodiment. Since the positive electrode side and the negative electrode side are symmetrical, the negative electrode side is not shown and a part of the description is omitted. Fig. 13 is a cross-sectional view of a plane a-a' of fig. 6 according to a modification. In the battery 101 shown in fig. 13, the first positive electrode insulation reinforcing member 24 projects from the positive electrode collector tab 7a side toward the second positive electrode insulation reinforcing member 25 side, and the second positive electrode insulation reinforcing member 25 projects from the positive electrode collector tab 7a side toward the first positive electrode insulation reinforcing member 24 side. The protruding portion of the first positive electrode insulation reinforcing member 24 is defined as a protruding portion 24 d. The protruding portion of the second positive electrode insulation reinforcing member 25 is defined as a protruding portion 25 f. Preferably, the protruding portion 24d of the first positive electrode insulation reinforcing member 24 and the protruding portion 25f of the second positive electrode insulation reinforcing member 25 face each other. The protrusion 24d and the protrusion 25f prevent the positive electrode current collector tab 7a from approaching the positive terminal portion 3 side, thereby preventing deformation of the battery 101 due to a force in the depth direction of the battery 101. Similarly, although not shown, the first negative electrode insulation reinforcing member 37 protrudes from the end portion on the negative electrode collector tab 8a side toward the second negative electrode insulation reinforcing member 38 side, and the second negative electrode insulation reinforcing member 38 protrudes from the end portion on the negative electrode collector tab 8a side toward the first negative electrode insulation reinforcing member 37 side, so that deformation of the battery 101 due to a force in the depth direction of the battery 101 can be prevented.
Fig. 14 shows a positive terminal portion 3 side of a battery 102 according to a modification of the battery 100 of the first embodiment. Since the positive terminal portion 3 side and the negative terminal portion 4 side are symmetrical, illustration and a part of description of the negative terminal portion 4 side are omitted. The first positive electrode insulation reinforcing member 24 and the second positive electrode insulation reinforcing member 25 are fitted to the positive terminal portion 3 side of the battery 102 shown in fig. 14. Fig. 14 is a cross-sectional view of a plane a-a' of fig. 6 according to a modification. Specifically, it is preferable that the convex portion 24e of the first positive electrode insulating and reinforcing member 24 along the first side surface 24c of the side wall 5e between the flange portion 5b and the inclined portion 5d of the first exterior covering portion 5 and the side wall 5e of the second positive electrode insulating and reinforcing member 25 along the flange portion 5b and the inclined portion 5d of the first exterior covering portion 5 are fitted into the concave portion 25g of the first side surface portion 25b facing the first side surface 24c of the first positive electrode insulating and reinforcing member 24. By disposing the convex portion 24e on the first exterior cover 5 side of the concave portion 25g, the first positive electrode insulation reinforcing member 24 which is not caulked and fixed can be fixed by the second positive electrode insulation reinforcing member 25 which is caulked and fixed. By fixing the first positive electrode insulation reinforcing member 24, the first positive electrode insulation reinforcing member 24 is prevented from approaching the positive electrode collector tab 7a side, and deformation of the battery 102 due to a force in the depth direction of the battery 102 can be prevented. Although not shown, the first negative insulation reinforcing member 37 and the second negative insulation reinforcing member 38 are similarly fitted to each other on the negative terminal portion 4 side. By fitting the negative terminal portion 4 side, the battery 102 can be prevented from being deformed by a force in the depth direction of the battery 102 even on the negative terminal portion 4 side, as in the case of the positive terminal portion 3 side. The shape of the concave-convex portion to be fitted and which one is the convex portion can be arbitrarily selected.
Fig. 15 shows a positive terminal portion 3 side of a battery 103 according to a modification of the battery 100 of the first embodiment. Since the positive terminal portion 3 side and the negative terminal portion 4 side are symmetrical, the negative terminal portion 4 side is not shown and a part of the description is omitted. Fig. 15 is a cross-sectional view of the plane B-B' of fig. 6 in a modification. On the positive terminal portion 3 side of the battery 103 shown in fig. 15, the first positive insulation reinforcing member 24 and the second positive insulation reinforcing member 25 are provided as protruding portions serving as pillars, and the first positive insulation reinforcing member 24 and the second positive insulation reinforcing member 25 are prevented from being deformed except just under the positive terminal 17, thereby enhancing the strength of the battery 103. In fig. 15, the protruding portion 24f of the first positive electrode insulation reinforcing member 24 and the protruding portion 25h of the second positive electrode insulation reinforcing member 25 constitute a pillar, but the pillar may be constituted by only the protruding portion 24f or the protruding portion 25 h. As with the positive terminal portion 3, the support is provided also on the negative terminal portion 4 side, so that deformation of the battery 103 due to a force in the thickness direction of the battery 103 can be prevented.
Fig. 16 shows the positive terminal portion 3 side of the battery 104 in a modification of the battery 100 of the first embodiment. Since the positive terminal portion 3 side and the negative terminal portion 4 side are symmetrical, the negative terminal portion 4 side is not shown and a part of the description is omitted. The first positive electrode insulation reinforcing member 24 and the second positive electrode insulation reinforcing member 25 are fitted to the positive terminal portion 3 side of the battery 104 shown in fig. 16. Fig. 16 is a cross-sectional view of plane E-E' of fig. 6 in a modification. Specifically, the fitting is preferably performed by fitting the concave portion 24g of the second side surface 24d of the first positive electrode insulating/reinforcing member 24 facing the width direction of the first external covering 5 into the convex portion 25i of the second side surface 25e of the second positive electrode insulating/reinforcing member 25 facing the side surface (long-side wall) of the width direction of the first external covering 5. By fitting the convex portion 24e and the concave portion 25g, the first positive electrode insulation reinforcing member 24 that is not caulked and fixed can be fixed by the second positive electrode insulation reinforcing member 25 that is caulked and fixed. By fixing the first positive electrode insulation reinforcing member 24, the first positive electrode insulation reinforcing member 24 is prevented from approaching the positive electrode collector tab 7a side, and deformation of the battery 104 due to a force in the depth direction of the battery 104 can be prevented. Although not shown, the first negative insulation reinforcing member 37 is similarly fitted to the second negative insulation reinforcing member 38 on the negative terminal portion 4 side. By fitting the negative terminal portion 4 side, the battery 104 can be prevented from being deformed by a force in the depth direction of the battery 104 even on the negative terminal portion 4 side, as in the case of the positive terminal portion 3 side. The shape of the concave-convex portion to be fitted and which one is the convex portion can be arbitrarily selected.
Fig. 17 shows a positive terminal portion 3 side of a battery 105 according to a modification of the battery 100 of the first embodiment. Since the positive electrode side and the negative electrode side are symmetrical, the negative electrode side is not shown and a part of the description is omitted. The battery 105 shown in fig. 17 is a modification of the battery 102 shown in fig. 14, and the first positive electrode insulation reinforcing member 24 is fitted to the second positive electrode insulation reinforcing member 25. The concave portion 24h provided in the protruding portion 24f of the first positive electrode insulation reinforcing member 24 is fitted to the convex portion 25j provided in the protruding portion 25h of the second positive electrode insulation reinforcing member 25, and the strength of the battery 105 in the thickness direction and the depth direction by the fitting of the support column is improved. The negative terminal portion 4 can also prevent the battery 105 from being deformed by the forces in the thickness direction and the depth direction, as in the positive terminal portion 3. The shape of the concave-convex portion to be fitted and which one is the convex portion can be arbitrarily selected.
Fig. 18 and 19 show a positive terminal portion 3 side of a battery 106 according to a modification of the battery 100 of the first embodiment. Since the positive electrode side and the negative electrode side are symmetrical, the negative electrode side is not shown and a part of the description is omitted. Fig. 18 is a cross-sectional view of a plane a-a' of fig. 6 according to a modification. Fig. 19 is a cross-sectional view of the plane B-B' of fig. 6 in a modification. In order to increase the ratio of the electrode group 2 in the battery 106, the center portion in the width direction of the positive electrode current collector tab 7a is notched. The battery 106 shown in fig. 18 and 19 is a modification of the battery 100, and the portion of the positive electrode collector tab 7a in the center in the width direction that faces the positive electrode insulation reinforcing and holding portion 24a is notched. That is, the positive electrode collector tab 7a does not face the positive electrode insulation reinforcing and holding portion 24 a. The facing direction referred to herein is a direction from the positive electrode external terminal 17 toward the negative electrode external terminal 32. Similarly, the positive electrode spare lead 11 and the electrode group-side positive electrode lead 12 do not face the positive electrode insulation reinforcing and holding portion 24a, respectively. That is, the spare positive electrode lead 11 and the electrode group-side positive electrode lead 12 are not provided in the portion where the positive electrode current collector tab 7a is not present, and the spare positive electrode lead 11 and the electrode group-side positive electrode lead 12 are divided into 2 portions. Similarly, the negative electrode collector tab 8a does not face the negative electrode insulation reinforcing and holding portion 37a on the negative electrode side. Then, the spare negative electrode lead 13 and the electrode group-side negative electrode lead 14 do not face the negative electrode insulation reinforcing and holding portion 37a, respectively. With this configuration, the battery strength can be improved, and the battery 106 having a larger capacity can be obtained.
Next, a method for manufacturing the battery of the first embodiment is described below. Fig. 21 (a) to 21 (b) and fig. 22 (a) to 22 (d) show process diagrams for manufacturing a battery.
An electrode group 2 as illustrated in fig. 4 was produced. Further, a first exterior cover 5 to which the positive terminal portion 3 and the negative terminal portion 4 are fixed is manufactured as illustrated in fig. 20. In addition, at least 1 guide hole for positioning is opened in each of the first exterior cover 5 and the second exterior cover 6. Fig. 21 (a) and 21 (b) show an example thereof. Fig. 21 (a) shows an example in which guide holes 39 for positioning are opened at four corners of the second exterior cover 6. Fig. 21 (b) shows an example in which guide holes 39 for positioning are opened at four corners of the first exterior packaging part 5.
The electrode group 2 is housed in the first exterior package portion 5, the electrode group-side positive electrode lead 12 is joined to the positive electrode terminal lead 23 by welding or the like, and the electrode group-side negative electrode lead 14 is joined to the negative electrode terminal lead 36 by welding or the like. The joining can be performed by, for example, laser welding, TIG welding, or friction stir welding. In the embodiment, any of the joints is treated as a weld.
Next, the second positive electrode insulation reinforcing member 25 and the second negative electrode insulation reinforcing member 38 are covered on the positive electrode collector tab 7a and the negative electrode collector tab 8a of the electrode group 2. Next, the second exterior cover 6 is disposed on the first exterior cover 5. Since the guide holes 39 are opened at the four corners of each of the first exterior packaging member 5 and the second exterior packaging member 6, the position of the second exterior packaging member 6 with respect to the first exterior packaging member 5 can be easily determined.
Next, as shown in fig. 22 (a), three sides (for example, two long sides and two short sides) of the first exterior cover part 5 and the second exterior cover part 6 are welded. The welding is, for example, resistance seam welding. The welding site is indicated by reference numeral 40. The welding portion 40 is preferably located inside the outer edges of the first and second external packaging members 5 and 6.
After injecting the electrolyte solution from the opening of the unwelded one side, the one side is welded by, for example, resistance seam welding as shown in fig. 22 (b). The welded portion 41 is preferably an outer edge portion of the first exterior cover 5 and the second exterior cover 6.
Next, after aging and initial charge and discharge are performed, as shown in fig. 22 (c), a cut portion 42 is produced by cutting a part of the welded portion 41, and the gas in the outer jacket material 1 is released. Then, as shown in fig. 22 d, a welding portion (a long side of the second exterior packaging part 6) 43 on the inner side of the welding portion 41 is welded by resistance seam welding or the like. The welding is preferably performed in a reduced pressure atmosphere.
Then, the guide hole 39 can be removed by cutting the vicinity of the outer edges of the first exterior packaging part 5 and the second exterior packaging part 6 as necessary. In addition, the guide hole 39 may be left unchanged.
By the above-described method, the battery of the first embodiment can be manufactured with high productivity.
The battery of the first embodiment can include a plurality of electrode groups 2 in 1 outer package 1. In this case, as the second exterior cover 6, it is preferable to use an exterior cover having a flange portion at an opening portion, as in the first exterior cover 5. In consideration of the strength of the battery 100, it is preferable to provide only 1 electrode group 2 in 1 outer package 1.
Fig. 23 is a process diagram illustrating the steps for manufacturing the positive terminal portion 3 side of the battery 100 in the case where 1 electrode group 2 is housed in one exterior member 1. The electrode group 2 is prepared, and the center tip of the positive electrode current collector tab 7a is bundled with a spare positive electrode lead 11. Next, as shown in the process diagram of fig. 23A, the spare positive electrode lead 11 and the electrode group-side positive electrode lead 12 are welded. After welding, the electrode group-side positive electrode lead 12 is bent to form the first extending portion 12 as shown in fig. 23B. Alternatively, a previously bent electrode-side positive electrode lead may be welded to the spare positive electrode lead 11 to obtain a member as shown in fig. 23B.
Then, the component of fig. 23B is inserted from the opening portion side of the first outer package 5 in which the positive terminal portion 3 is previously incorporated. After the insertion, the first extension 12b of the electrode group-side positive electrode lead 12 and the first extension of the positive electrode terminal lead 23 are fixed by laser welding, and 1 electrode group 2 is fixed in the first exterior covering portion 5 as shown in fig. 23C. Then, the battery 100 can be obtained by capping with the second exterior packaging member 6.
The battery of the first embodiment described above can increase the thickness of the lead in outer jacket material 1 and provide a large current flow direction even when the battery is thin.
(second embodiment)
The battery pack of the second embodiment includes 1 or more batteries of the first embodiment. Fig. 24 and 25 show an example of a battery pack of the battery according to the first embodiment.
As shown in fig. 24, the battery pack 200 uses the batteries 100 to 106 of the first embodiment as unit cells (cells). The battery pack 200 is sometimes covered by a laminate not shown. A conductive coupling member 62 having a triangular prism shape is disposed between the top surface of the negative electrode terminal 32 of the first unit battery cell 60 and the top surface of the negative electrode terminal 32 of the second unit battery cell 61. Further, a conductive coupling member 62 having a triangular prism shape is disposed between the top surface of the positive electrode terminal 17 of the first unit battery cell 60 and the top surface of the positive electrode terminal 17 of the second unit battery cell 61. The two top surfaces and the conductive connecting member 62 are electrically connected by soldering, respectively. Examples of welding include laser welding, arc welding, and resistance welding. This results in a unit (unit)63 of the battery pack in which the first unit battery cell 60 and the second unit battery cell 61 are connected in parallel. The battery pack 200 is obtained by connecting the cells 63 of the battery pack in series with each other using the bus bars 64.
The battery pack 201 shown in fig. 25 uses the batteries 100 to 106 of the first embodiment as unit battery cells. A cell in which the first unit battery cell 60 and the second unit battery cell 61 are connected in series using the conductive connecting member 62 is used as a cell 65 of the battery pack, and the cells 65 of the battery pack are connected in series with each other via the bus bar 64, thereby constituting a battery pack. The method of electrically connecting the first unit battery cell 60 and the second unit battery cell 61 using the conductive coupling member 62 is the same as the method described with reference to fig. 20.
In the battery pack shown in fig. 24 and 25, the adjacent first unit battery cell 60 and second unit battery cell 61 are stacked with the main surfaces of the outer jacket material 1 facing each other. For example, in the cell 63 of the battery pack shown in fig. 20, the main surface of the first exterior cover 5 of the first unit battery cell 60 faces the main surface of the first exterior cover 5 of the second unit battery cell 61. In addition, in the cells 63 of the adjacent battery packs, the main surface of the second exterior cover 6 of the second unit battery cell 61 of the cell 63 of one battery pack faces the main surface of the second exterior cover 6 of the second unit battery cell 61 of the cell 63 of the other battery pack. By stacking the cells with the main surfaces of the outer jacket material facing each other in this manner, the volumetric energy density of the battery pack can be increased.
As shown in fig. 24 and 25, it is preferable to provide an insulating space between the unit battery cell 60 and the unit battery cell 61, between the unit battery cells 60 and 60, and between the unit battery cells 61 and 61, or to provide a gap of 0.03mm or more, or to interpose an insulating member (for example, polypropylene as a resin, polyphenylene sulfide, epoxy, alumina as a fine ceramic, zirconia, or the like) between them.
The positive electrode external terminal 17 and the negative electrode terminal 32 have truncated pyramid-shaped head portions, and thus the external terminals of the unit cells can be connected to one portion (the first inclined surface) and the bus bars can be connected to the other portion (the second inclined surface) of two portions (for example, the first and second inclined surfaces) of 1 head portion. That is, the connection in both directions can be performed with 1 head. As a result, the path for electrically connecting the batteries can be shortened, and thus a large current can be easily caused to flow through the battery pack with low resistance.
Since the battery pack according to the second embodiment includes at least one battery according to the first embodiment, it is possible to achieve a reduction in thickness and an improvement in flexibility, and to provide a battery pack having high strength and excellent reliability and capable of reducing manufacturing cost.
The battery pack is used as a power source for electronic devices and vehicles (railway vehicles, automobiles, bicycles with prime movers, light vehicles, railroad cars, and the like).
As described above, the battery pack may include a battery pack in which a plurality of batteries are electrically connected in series, in parallel, or a combination of series and parallel. The Battery pack may include a circuit such as a Battery Control Unit (BMU) in addition to the Battery pack, but a circuit included in a device (for example, a vehicle) in which the Battery pack is mounted may be used as the Battery Control Unit. The battery control unit has a function of monitoring the voltage or current or both of the battery cell and the battery pack to prevent overcharge and overdischarge.
(third embodiment)
The third embodiment relates to an electrical storage device. Battery packs 200 and 201 according to the second embodiment can be mounted on power storage device 300. The power storage device 300 shown in the conceptual diagram of fig. 26 includes battery packs 200 and 201, an inverter 302, and a converter 301. The converter 301 converts dc power from the external ac power supply 303 to charge the battery packs 200 and 201, and the inverter 302 converts ac power from the battery packs 200 and 201 to supply electric power to the load 304 connected to the power storage device 300. By employing the power storage device 300 of the present configuration having the battery packs 200 and 201 of the embodiment, a power storage device having excellent battery characteristics can be provided. In addition, the batteries 100 to 106 may be used instead of the battery packs 200, 201. The reliability of battery packs 200 and 201 is improved, and thus the reliability of battery 300 is also improved.
(fourth embodiment)
The fourth embodiment relates to a vehicle. The vehicle of the fourth embodiment uses the battery packs 200, 201 of the second embodiment. The structure of the vehicle according to the present embodiment will be described in brief with reference to the schematic diagram of the vehicle 400 in fig. 27. Vehicle 400 has battery packs 200, 201, a vehicle body 401, a motor 402, wheels 403, and a control unit 404. Battery packs 200 and 201, motor 402, wheels 403, and control unit 404 are disposed on vehicle body 401. The control unit 404 converts or adjusts the output of the electric power output from the battery packs 200 and 201. The motor 402 rotates the wheels 403 using the electric power output from the battery packs 200, 201. The vehicle 400 also includes an electric vehicle such as an electric train, and a hybrid vehicle having another drive source such as an engine. The battery packs 200 and 201 may be charged with regenerative energy from the motor 402. The device driven by the electric energy from the battery packs 200 and 201 is not limited to the motor, and may be used as a power source for operating the electric device included in the vehicle 400. It is preferable to obtain regenerative energy when vehicle 400 decelerates and charge battery packs 200 and 201 using the obtained regenerative energy. By adopting the vehicle 400 of the present configuration having the battery packs 200, 201 of the embodiment, a vehicle having excellent battery characteristics can be provided. In addition, the batteries 100 to 106 may be used instead of the battery packs 200 and 201. By improving the reliability of the battery packs 200, 201, the reliability of the vehicle 400 is also improved.
(fifth embodiment)
A fifth embodiment relates to a flying body (e.g., a multi-axis helicopter). The battery packs 200 and 201 of the second embodiment are used as the flight vehicle of the fifth embodiment. The configuration of the flight vehicle according to the present embodiment will be briefly described with reference to a schematic diagram of a flight vehicle (four-axis helicopter) 500 in fig. 28. The flight vehicle 500 includes battery packs 200 and 201, a body frame 501, a motor 502, a rotor 503, and a control unit 504. The battery packs 200 and 201, the motor 502, the rotary wing 503, and the control unit 504 are disposed on the body frame 501. The control unit 504 converts or adjusts the output of the electric power output from the battery packs 200 and 201. The motor 502 rotates the rotary wing 503 using the electric power output from the battery packs 200 and 201. By using the flight body 500 of the present configuration having the battery packs 200, 201 of the embodiment, a flight body with improved reliability is provided. In addition, the batteries 100 to 106 may be used instead of the battery packs 200, 201.
Several embodiments of the present invention have been described, but these embodiments are presented as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in other various ways, and various omissions, substitutions, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof.
Description of the reference numerals
1 … outer package member, 2 … electrode group, 3 … positive electrode terminal portion, 4 … negative electrode terminal portion, 5 … first outer package portion, 5a … opening portion, 5b … flange portion, 5c … bottom surface, 5d … inclined surface, 5e … side wall, 6 … second outer package portion, 7 … positive electrode, 7a … positive electrode collector tab, 7b … positive electrode material layer, 8 … negative electrode, 8a … negative electrode collector tab, 8b … negative electrode material layer, 9 … diaphragm, 10 … insulating sheet, 11 … backup positive electrode lead, 12 … electrode group side positive electrode lead, 13 … backup negative electrode lead, 14 … electrode group side negative electrode lead, 15, 30 … first outer package portion through hole, 16, 31 … burring portion, 17 … positive electrode external terminal, 17a … positive electrode head portion, 17b … positive electrode insulating member, 18a … positive electrode insulating member, 18b … positive electrode reinforcing member, 3619, … insulating member, 20 … positive electrode terminal insulating member, 21 … head portion, 23 … positive electrode terminal lead, 24 … first positive electrode insulating and reinforcing member, 24a … positive electrode insulating and reinforcing holding portion, 25 … second positive electrode insulating and reinforcing member, 32 … negative electrode external terminal, 32a … negative electrode head portion, 32b … negative electrode shaft portion, 33a … negative electrode insulating member, 33b … negative electrode reinforcing member, 35 … negative electrode terminal insulating member, 36 … negative electrode terminal lead, 37 … first negative electrode insulating and reinforcing member, 37a … negative electrode insulating and reinforcing holding portion, 38 … second insulating and reinforcing member, 39 … guide hole, 40, 41, 43 … welded portion, 42 … cut-out portion, 60 … first unit cell, 61 … second unit cell, 62 … conductive connecting member, 63, 65 … cell group, 64 … bus bar, 100 to 36106 cell, 200, 36201 cell, … cell pack, 300 electrical storage device, 301 … converter, 302 … inverter, 303 … external ac power supply, 304 … load, 400 … vehicle, 401 … vehicle body, 402 … motor, 403 … wheel, 404 … control unit, 500 … flight vehicle, 501 … body frame, 502 … motor, 503 … rotor wing, 504 … control unit.
Claims (19)
1. A battery, comprising:
the flat electrode group comprises a positive electrode, a positive electrode collector lug electrically connected with the positive electrode, a negative electrode and a negative electrode collector lug electrically connected with the negative electrode, wherein the positive electrode collector lug wound into a flat shape is positioned on a first end surface, and the negative electrode collector lug wound into a flat shape is positioned on a second end surface;
an electrode group-side positive electrode lead electrically connected to the positive electrode collector tab;
an electrode group-side negative electrode lead electrically connected to the negative electrode collector tab;
an outer package member including a first outer package portion having a flange portion at an opening portion and a second outer package portion in which the electrode group is housed in a space formed by welding the flange portion of the first outer package portion and the second outer package portion;
a positive terminal portion having a through-hole on the positive collector tab side, the first exterior packaging portion including: a positive electrode external terminal including a positive electrode head portion and a positive electrode shaft portion extending from the positive electrode head portion; and a positive electrode terminal lead having a through hole and electrically connected to the electrode group side positive electrode lead, wherein the positive electrode head portion protrudes outward of the first exterior cover portion, the positive electrode shaft portion is inserted into the through hole of the positive electrode terminal lead, and the positive electrode shaft portion is fixed to the first exterior cover portion and the positive electrode terminal lead by caulking;
a negative terminal portion having a through-hole on the negative collector tab side, the first exterior packaging portion including: a negative external terminal including a negative head portion and a negative shaft portion extending from the negative head portion; and a negative electrode terminal lead having a through hole and electrically connected to the electrode group side negative electrode lead, wherein the negative electrode head portion protrudes outward of the first exterior cover portion, the negative electrode shaft portion is inserted into the through hole of the negative electrode terminal lead, and the negative electrode shaft portion is fixed to the first exterior cover portion and the negative electrode terminal lead by caulking;
a first positive electrode insulation reinforcing member disposed on an inner surface side of the first exterior cover part and an inner surface side of the second exterior cover part, and disposed between the positive electrode terminal and the second exterior cover part; and
a first negative electrode insulation reinforcing member disposed between the negative electrode terminal and the second exterior case portion, the first negative electrode insulation reinforcing member being disposed on an inner surface side of the first exterior case portion and an inner surface side of the second exterior case portion,
the first positive electrode insulation reinforcing member includes a positive electrode insulation reinforcing and holding portion having a slope facing an end portion of the positive electrode shaft portion opposite to the positive electrode head portion side,
the first negative electrode insulation reinforcing member includes a negative electrode insulation reinforcing and holding portion having a slope facing an end portion of the negative electrode shaft portion opposite to the negative electrode head portion.
2. The battery according to claim 1, wherein,
an angle formed by a surface of the positive electrode shaft portion facing the inclined surface of the positive electrode insulation reinforcing and holding portion and the second exterior packaging portion is defined as A1,
the angle formed by the inclined surface of the positive electrode insulation reinforcing and holding portion and the second outer package portion was set to a2,
an angle formed by a surface of the negative electrode shaft portion facing the inclined surface of the negative electrode insulation reinforcing and holding portion and the second exterior packaging portion is B1,
the angle formed by the slope of the negative electrode insulation reinforcing and holding portion and the second exterior packaging member was set to B2,
satisfies | A1-A2| < 8 degrees and | B1-B2| < 8 degrees.
3. The battery according to claim 1 or 2,
the distance between the inclined surface of the positive electrode insulation reinforcing and holding part and the positive electrode shaft part is more than 0.0mm and less than 1.0mm,
the distance between the inclined surface of the negative electrode insulation reinforcing and holding portion and the negative electrode shaft portion is 0.0mm to 1.0 mm.
4. The battery according to any one of claims 1 to 3,
the inclined surface of the positive electrode insulation reinforcing and holding portion is opposed to the positive electrode terminal lead,
the inclined surface of the negative insulation reinforcement holding portion faces the negative terminal lead.
5. The battery according to any one of claims 1 to 4,
the distance between the inclined surface of the positive electrode insulation reinforcing and holding part and the positive electrode terminal lead is more than 0.0mm and less than 1.0mm,
the distance between the inclined surface of the negative electrode insulation reinforcing and holding portion and the negative electrode terminal lead is 0.0mm to 1.0 mm.
6. The battery according to any one of claims 1 to 5, further comprising:
a second positive electrode insulation reinforcing member disposed on an inner surface side of the first exterior cover portion, between the positive electrode terminal lead and the first exterior cover portion, and facing the first positive electrode insulation reinforcing member; and
a second negative electrode insulation reinforcing member disposed on an inner surface side of the first exterior cover portion, between the negative electrode terminal lead and the first exterior cover portion, and facing the first negative electrode insulation reinforcing member,
the second positive electrode insulation reinforcing member is fixed to the positive electrode shaft, the first outer package portion, and the positive electrode terminal lead by caulking,
the second negative electrode insulation reinforcing member is fixed to the negative electrode shaft portion, the first exterior packaging portion, and the negative electrode terminal lead by caulking.
7. The battery according to claim 6, wherein,
the end portion side of the first positive electrode insulation reinforcing member on the positive electrode collector tab side protrudes toward the second positive electrode insulation reinforcing member side,
the end portion side of the second positive electrode insulation reinforcing member on the positive electrode collector tab side protrudes toward the first positive electrode insulation reinforcing member side,
the end portion side of the first negative electrode insulation reinforcing member on the negative electrode collector tab side protrudes toward the second negative electrode insulation reinforcing member side,
the end portion of the second negative electrode insulation reinforcing member on the negative electrode collector tab side protrudes toward the first negative electrode insulation reinforcing member side.
8. The battery according to claim 6 or 7,
the first positive electrode insulation reinforcing member, the second positive electrode insulation reinforcing member, the first negative electrode insulation reinforcing member, and the second negative electrode insulation reinforcing member are resins,
the first and second exterior packaging parts are covered with the first and second positive electrode insulation reinforcing members on the inner surface side from the positive electrode terminal to the positive electrode collector tab,
the first and second exterior packaging parts are covered with the first and second negative electrode insulation reinforcing members on the inner surface side from the negative electrode terminal to the negative electrode collector tab.
9. The battery according to any one of claims 6 to 8,
the first positive electrode insulation reinforcing member and the second positive electrode insulation reinforcing member are fitted together,
the first negative electrode insulation reinforcing member and the second negative electrode insulation reinforcing member are fitted.
10. The battery according to any one of claims 1 to 9,
the width of the positive electrode collector tab is narrower than the width of the electrode group,
the width of the negative electrode collector tab is narrower than the width of the electrode group.
11. The battery according to any one of claims 1 to 10,
the positive electrode current collecting tabs are respectively notched by more than 5mm from both ends,
the negative electrode collector lug is cut by more than 5mm from two ends.
12. The battery according to any one of claims 1 to 11,
the first exterior packaging part and the second exterior packaging part are made of any one selected from the group consisting of stainless steel, aluminum laminate and aluminum,
the first and second exterior packaging parts have a plate thickness of 0.02mm to 0.3 mm.
13. The battery according to any one of claims 1 to 12,
the positive electrode collector tab does not face the positive electrode insulation reinforcing and holding part,
the negative electrode collector tab does not face the negative electrode insulation reinforcing and holding portion.
14. The battery according to any one of claims 1 to 13,
a displacement of the battery when a load of 10N is applied to the positive electrode terminal or the negative electrode terminal in a direction from the first exterior packaging part toward the second exterior packaging part is less than 1.0 mm.
15. The battery according to any one of claims 1 to 14,
the number of the electrode groups is 1,
the thickness of the battery is 5mm to 30 mm.
16. A battery pack comprising 1 or more batteries according to claims 1 to 15.
17. An electricity storage device comprising the battery according to claims 1 to 15 or the battery pack according to claim 16.
18. A vehicle comprising the battery of claims 1-15 or the battery pack of claim 16.
19. A flying object comprising the battery of claims 1-15 or the battery pack of claim 16.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2018/046374 WO2020129128A1 (en) | 2018-12-17 | 2018-12-17 | Battery, battery pack, electrical storage device, vehicle, and flying object |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113169368A true CN113169368A (en) | 2021-07-23 |
| CN113169368B CN113169368B (en) | 2023-08-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880100276.3A Active CN113169368B (en) | 2018-12-17 | 2018-12-17 | Battery, battery pack, power storage device, vehicle, and flying body |
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| Country | Link |
|---|---|
| JP (1) | JP7155290B2 (en) |
| CN (1) | CN113169368B (en) |
| WO (1) | WO2020129128A1 (en) |
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| KR20230114017A (en) * | 2022-01-24 | 2023-08-01 | 삼성에스디아이 주식회사 | secondary battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20070097153A (en) * | 2006-03-28 | 2007-10-04 | 삼성에스디아이 주식회사 | Secondary battery |
| JP2011070918A (en) * | 2009-09-25 | 2011-04-07 | Toshiba Corp | Battery |
| WO2014054733A1 (en) * | 2012-10-03 | 2014-04-10 | 新神戸電機株式会社 | Secondary battery |
| JP2015115210A (en) * | 2013-12-12 | 2015-06-22 | 日立マクセル株式会社 | Nonaqueous electrolyte secondary battery |
| WO2016204147A1 (en) * | 2015-06-15 | 2016-12-22 | 株式会社 東芝 | Battery and battery pack |
| CN107887560A (en) * | 2016-09-30 | 2018-04-06 | 三洋电机株式会社 | Rechargeable nonaqueous electrolytic battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000195475A (en) * | 1998-12-25 | 2000-07-14 | Mitsubishi Chemicals Corp | Secondary battery |
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- 2018-12-17 JP JP2020560658A patent/JP7155290B2/en active Active
- 2018-12-17 CN CN201880100276.3A patent/CN113169368B/en active Active
- 2018-12-17 WO PCT/JP2018/046374 patent/WO2020129128A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070097153A (en) * | 2006-03-28 | 2007-10-04 | 삼성에스디아이 주식회사 | Secondary battery |
| JP2011070918A (en) * | 2009-09-25 | 2011-04-07 | Toshiba Corp | Battery |
| WO2014054733A1 (en) * | 2012-10-03 | 2014-04-10 | 新神戸電機株式会社 | Secondary battery |
| JP2015115210A (en) * | 2013-12-12 | 2015-06-22 | 日立マクセル株式会社 | Nonaqueous electrolyte secondary battery |
| WO2016204147A1 (en) * | 2015-06-15 | 2016-12-22 | 株式会社 東芝 | Battery and battery pack |
| CN107887560A (en) * | 2016-09-30 | 2018-04-06 | 三洋电机株式会社 | Rechargeable nonaqueous electrolytic battery |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2020129128A1 (en) | 2021-09-27 |
| WO2020129128A1 (en) | 2020-06-25 |
| JP7155290B2 (en) | 2022-10-18 |
| CN113169368B (en) | 2023-08-04 |
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