Battery

Abstract

To disclose a battery that enables improved connectivity between terminals and current collectors while enhancing the structural efficiency around the terminals and current collectors.SOLUTION: A battery disclosed herein comprises an electrode laminate, a current collector, and terminals. The current collector protrudes from the electrode laminate. The terminal has a contact surface with the current collector. The contact surface includes curved surfaces. The curved surface bulges outward on the side opposite the current collector side.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present application discloses a battery. [Background technology]

[0002] Patent Document 1 discloses a technology for a battery in which an electrode stack and a lid terminal are electrically connected via a current collecting part, an outer casing is bonded to the outer periphery of the lid terminal, and the current collecting part and the electrode stack are housed inside the outer casing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-084066 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional batteries have room for improvement in terms of improving the structural efficiency around the terminals and current collectors, and improving the connectivity between the terminals and current collectors. [Means for solving the problem]

[0005] The present application discloses the following aspects as means for solving the above problems. <Aspect 1> A battery having an electrode stack, a current collector, and a terminal, the current collecting portion protrudes from the electrode stack, the terminal has a contact surface with the current collecting portion, the contact surface includes a curved surface; The curved surface bulges out toward the opposite side to the current collecting portion. battery. <Aspect 2> 2. The battery of embodiment 1, the electrode stack and the current collecting portion are housed in an exterior body, the terminal has the contact surface inside the exterior body, The terminal has an exposed surface facing the outside of the exterior body. battery. <Aspect 3> 3. The battery of embodiment 1 or 2, The terminal has a base and a protrusion, the base has a first surface and a second surface opposite the first surface; the protruding portion protrudes from the base portion toward the electrode stack, the protrusion has a first protrusion and a second protrusion, the first protruding portion has a third surface facing the second protruding portion and a fourth surface opposite to the third surface, the second protruding portion has a fifth surface facing the first protruding portion and a sixth surface opposite to the fifth surface, At least one of the first surface, the third surface, and the fifth surface has the contact surface. battery. <Aspect 4> 4. The battery of embodiment 3, the electrode stack and the current collecting portion are housed in an exterior body, the first surface, the third surface, and the fifth surface face the interior of the exterior body; the second surface faces the exterior of the exterior body, The fourth surface and the sixth surface are bonded to the exterior body. battery. <Aspect 5> 5. The battery of embodiment 3 or 4, The planar shape of the base is rectangular, the protrusion has a third protrusion and a fourth protrusion, the rectangle has first and second sides opposed to each other and third and fourth sides opposed to each other, the first protruding portion protrudes from the first side, the second protruding portion protrudes from the second side, the third protruding portion protrudes from the third side, The fourth protrusion protrudes from the fourth side. battery. [Effects of the Invention]

[0006] According to the battery of the present disclosure, the structural efficiency around the terminals and current collectors is likely to be improved (space is likely to be saved), and the connectivity between the terminals and current collectors is likely to be improved. [Brief explanation of the drawings]

[0007] [Figure 1] 1 shows a schematic diagram of an example of the external configuration of a battery. [Figure 2] 2 shows a schematic diagram of an example of a cross section taken along the line II-II of FIG. 1. [Figure 3] 2 shows a schematic diagram of an example of a cross section taken along the line III-III of FIG. 1. [Figure 4] 4 shows a schematic diagram of an example of a cross section taken along the line IV-IV in FIG. 1. [Figure 5] 2A and 2B are diagrams illustrating an example of the external shape of a terminal. [Figure 6] 2A and 2B are schematic diagrams illustrating an example of a cross-sectional shape of a terminal. [Figure 7] 2A and 2B are schematic diagrams illustrating an example of a cross-sectional shape of a terminal. [Figure 8] 2A and 2B are schematic diagrams illustrating an example of a cross-sectional shape of a terminal. [Figure 9] 2A and 2B are schematic diagrams illustrating an example of a cross-sectional shape of a terminal. [Figure 10] 1 is a schematic diagram illustrating an example of a bonding configuration between a terminal and an exterior body, with the current collector and electrode stack omitted. [Figure 11] FIG. 1 is a diagram for explaining problems with conventional batteries. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, one embodiment of the battery and the method for manufacturing the battery according to the present disclosure will be described, but the battery and the method for manufacturing the battery according to the present disclosure are not limited to the following embodiment.

[0009] 1. Issues with conventional batteries FIG. 11 shows an example of the cross-sectional structure of a conventional battery. As shown in FIG. 11, in conventional batteries, the current collector protruding from the electrode laminate is bent to connect the current collector to the terminal while ensuring structural efficiency around the terminal and the current collector. In this case, as shown in FIG. 11, there are concerns about deterioration of the current collector due to the bending radius of the current collector becoming too small, and deterioration of the exterior due to the current collector coming into contact with the exterior. Furthermore, in conventional batteries, the contact area between the terminal and the current collector is small, leaving room for improvement in the connectivity between the terminal and the current collector.

[0010] 2. Battery of the present disclosure In view of the above-mentioned problems, the present application discloses a battery capable of improving the structural efficiency around the terminals and current collectors while improving the connectivity between the terminals and current collectors. As shown in FIGS. 1 to 7, a battery 100 according to one embodiment includes an electrode stack 10, a current collector 20, and a terminal 30. The current collector 20 protrudes from the electrode stack 10. As shown in FIGS. 5 and 6, the terminal 30 has a contact surface 30a with the current collector 20. The contact surface 30a includes a curved surface 30ax. The curved surface 30ax bulges outward from the current collector 20.

[0011] 2.1 Electrode stack The battery 100 supplies the power generated in the electrode stack 10 to an external device or the like via the current collecting parts 20 and the terminals 30. That is, the electrode stack 10 functions as the power generating element of the battery 100.

[0012] As shown in FIGS. 2 and 4 , the electrode stack 10 may be formed by stacking multiple electrode bodies. Each electrode body may include, for example, a layer made of a positive electrode current collector, a layer made of a positive electrode active material layer, an electrolyte layer, a layer made of a negative electrode active material layer, and a layer made of a negative electrode current collector. Known positive electrode current collectors, positive electrode active material layers, electrolyte layers, negative electrode active material layers, and negative electrode current collectors may be used. The electrode stack 10 may include a solid electrolyte, a liquid electrolyte, or both a solid electrolyte and a liquid electrolyte. When the electrode stack 10 includes at least a solid electrolyte, a battery 100 with excellent mechanical properties, output characteristics, and the like is easily obtained. The shape of the stacking surface of each layer constituting the electrode stack 10 may be, for example, rectangular.

[0013] The number of stacked electrode bodies in the electrode stack 10 is not particularly limited. In the electrode stack 10, the multiple electrode bodies may be connected to each other in series or in parallel. The electrode stack 10 may have a bipolar structure. Furthermore, in the electrode stack 10, the stacking surfaces of the electrode bodies may be insulated from each other by providing an insulating layer between one electrode body and another electrode body, for example. As shown in FIG. 2, in the battery 100, the multiple electrode bodies can be electrically connected to each other by the current collecting section 20. For example, the multiple electrode bodies can be electrically connected to each other in parallel by the current collecting section 20.

[0014] As shown in FIGS. 2 to 4 , the electrode stack 10 may have one end face 10x at one end of each layer in the stacking direction, another end face 10y at the other end of the stacking direction, and a side face 10z connecting the one end face 10x and the other end face 10y. The side face 10z may be formed by the outer edge of each layer constituting the electrode stack 10. In the electrode stack 10, the stacking areas of the layers may differ, so the side face 10z may have irregularities or gaps. Furthermore, the side face 10z may have a surface along the stacking direction of the layers in the electrode stack 10. Furthermore, the current collecting section 20, which will be described later, may protrude from the side face 10z of the electrode stack 10 toward the terminal 30. The electrode stack 10 may be, for example, plate-shaped or rectangular parallelepiped-shaped as a whole.

[0015] As shown in FIGS. 2 and 4, the electrode stack 10 has a thickness T 10 The electrode stack 10 may have a thickness T 10 is not particularly limited. 10 may be, for example, 5 mm or more and 100 mm or less, or 10 mm or more and 50 mm or less.

[0016] As shown in FIGS. 3 and 4, the electrode stack 10 has a width W along the stacking surface at the side surface 10z from which the current collecting portion 20 protrudes. 10 The electrode stack 10 may have a width W 10 is not particularly limited. 10 may be, for example, 10 mm or more and 500 mm or less, or 50 mm or more and 200 mm or less.

[0017] 2.2 Current collecting section The current collecting portion 20 protrudes from the electrode stack 10 and is connected to the contact surface 30 a of the terminal 30 , thereby electrically connecting the electrode stack 10 and the terminal 30 .

[0018] 2 and 3, the current collecting part 20 may be, for example, a bundle of multiple current collectors protruding from the side surface 10z of the electrode laminate 10 toward the terminal 30. The number of current collectors protruding in the same direction from the electrode laminate 10 is not particularly limited and may be, for example, 2 to 500, or 30 to 100. In the battery 100, the current collecting part 20 may be a bundle of multiple positive electrode current collectors, or a bundle of multiple negative electrode current collectors. In the battery 100, the multiple current collectors protruding from the side surface 10z of the electrode laminate 10 toward the terminal 30 may be bundled together, or may be separated into multiple bundles.

[0019] The current collector constituting the current collecting unit 20 may be, for example, a metal foil or a metal mesh. From the viewpoint of excellent handleability, the current collecting unit 20 may include multiple metal foils. Examples of metals constituting the current collector include Cu, Ni, Cr, Au, Pt, Ag, Al, Fe, Ti, Zn, Co, and stainless steel. The current collector may have a coating layer on its surface for the purpose of adjusting resistance, etc. Furthermore, when the current collecting unit 20 is made of multiple metal foils, some layer may be present between the multiple metal foils. The thickness of each current collector is not particularly limited. For example, it may be 0.1 μm or more, 1 μm or more, 1 mm or less, or 100 μm or less.

[0020] As shown in FIG. 3, the current collecting portion 20 has a width W 20 The current collecting portion 20 may have a width W 20 is not particularly limited. 20 may be, for example, 5 mm or more and 450 mm or less, or 20 mm or more and 190 mm or less.

[0021] 2.3 Terminals As shown in FIGS. 2, 3, and 5 to 7, the terminal 30 has a contact surface 30a with the current collecting part 20. The contact surface 30a includes a curved surface 30ax. The curved surface 30ax bulges away from the current collecting part 20. "The curved surface bulges away from the current collecting part" means that the curved surface 30ax is concave. By including the curved surface 30ax in the contact surface 30a with the current collecting part 20 of the terminal 30, the current collecting part 20 can be connected to the terminal 30 while being aligned with the contact surface 30a. In other words, the contact area between the contact surface 30a and the current collecting part 20 is increased, improving the connectivity of the current collecting part 20 with the terminal 30. Furthermore, by having the contact surface 30a as a concave surface, a portion of the current collecting part 20 can be accommodated within the space defined by the concave surface, thereby improving the structural efficiency around the terminal 30.

[0022] 2.3.1 Contact surfaces As described above, the contact surface 30a of the terminal 30 includes a curved surface 30ax that bulges toward the opposite side from the current collecting portion 20. In the battery 100, the current collecting portion 20 contacts the contact surface 30a along the contact surface 30a, including the curved surface 30ax, thereby ensuring connection between the current collecting portion 20 and the terminal 30. The radius of curvature of the curved surface 30ax can be determined appropriately depending on the bundle shape of the current collecting portion 20, the size of the terminal 30, and the like. For example, the contact surface 30a may include a curved surface 30ax having a radius of curvature of 0.5 mm or more and 50 mm or less. The contact surface 30a may have the curved surface 30ax only in part, or the entire contact surface 30a may be composed of the curved surface 30ax. Furthermore, the contact surface 30a may be a combination of a flat surface 30ay and a curved surface 30ax, as shown in the figure, or a combination of multiple curved surfaces 30ax with different radii of curvature.

[0023] 2.3.2 Surfaces other than contact surfaces The terminal 30 may have a surface other than the contact surface 30a. The surface other than the contact surface 30a is not particularly limited. For example, as shown in FIGS. 2, 3, and 5 to 7, when the electrode stack 10 and the current collecting part 20 are housed in an exterior body 40, the terminal 30 may have the contact surface 30a inside the exterior body 40, or may have an exposed surface facing the outside of the exterior body 40 (for example, a second surface 31y described later). Furthermore, as shown in FIGS. 2 and 3, the terminal 30 may have an adhesive surface with the exterior body 40 (for example, a fourth surface 32ay or a sixth surface 32by described later).

[0024] 2.3.3 Examples of terminal shapes Specific examples of the shape of the terminal 30 will be described below, but the shape of the terminal 30 is not limited to the specific shape described below. As shown in FIGS. 2, 3, and 5 to 7, the terminal 30 may have a base 31 and a protruding portion 32. The base 31 may have a first surface 31x and a second surface 31y opposite the first surface 31x. The protruding portion 32 may protrude from the base 31 toward the electrode stack 10. The protruding portion 32 may have a first protruding portion 32a and a second protruding portion 32b. The first protruding portion 32a may have a third surface 32ax facing the second protruding portion 32b and a fourth surface 32ay opposite the third surface 32ax. The second protruding portion 32b may have a fifth surface 32bx facing the first protruding portion 32a and a sixth surface 32by opposite the fifth surface 32bx. In this case, at least one of the first surface 31x, the third surface 32ax, and the fifth surface 32bx may have the contact surface 30a. When the terminal 30 has such a shape, the structural efficiency around the terminal 30 is likely to be further improved.

[0025] 2 and 3 , when the electrode stack 10 and the current collecting part 20 are housed in an exterior body 40, the first surface 31x, the third surface 32ax, and the fifth surface 32bx may face the inside of the exterior body 40, the second surface 31y may face the outside of the exterior body 40, and the fourth surface 32ay and the sixth surface 32by may be bonded to the exterior body 40. When the electrode stack 10, the current collecting part 20, the terminal 30, and the exterior body 40 satisfy this positional relationship, the structural efficiency around the terminal 30 is likely to be further improved.

[0026] 2.3.3.1 Base As shown in FIGS. 2, 3, and 5 to 7, the base 31 may have a first surface 31x facing the electrode laminate 10 and a second surface 31y facing the opposite side to the electrode laminate 10. The base 31 may correspond to, for example, the bottom of a vessel-shaped terminal 30. As shown in FIGS. 2 and 3, the first surface 31x may be in contact with the current collector 20 and may have a joint 25 with the current collector 20. On the other hand, the second surface 31y may face the outside of the battery 100. The first surface 31x and the second surface 31y of the base 31 may be, for example, flat as shown in the drawings, or may have an uneven surface. Furthermore, as described above, the first surface 31x may constitute a contact surface 30a including a curved surface 30ax. The planar shapes of the first surface 31x and the second surface 31y (referring to the planar shapes when the first surface or the second surface is projected) are not particularly limited. Although the planar shapes of the illustrated first surface 31x and second surface 31y are rectangular, the planar shapes may be square, quadrilaterals other than rectangles (rectangles and squares), other polygonal shapes, circular or elliptical shapes, or other shapes. In particular, when first surface 31x and second surface 31y are rectangular, in particular when they are rectangular, handling properties and mechanical strength are likely to be improved. Note that the terms "polygon," "quadrilateral," "rectangle," and "rectangle" used in this application each include shapes with chamfered corners and shapes with rounded corners.

[0027] As shown in FIGS. 6 and 7, the base 31 has a thickness T 31 (minimum thickness from the first surface 31x to the second surface 31y). 31 is not particularly limited. In particular, the thickness T 31 When the distance is 0.1 mm or more and 10 mm or less, or 0.2 mm or more and 3 mm or less, the structural efficiency around the terminal 30 and the strength of the terminal 30 tend to be well balanced.

[0028] As shown in FIG. 6, the base 31 has a length (height) L 1 in the stacking direction of the electrode stack 10 in the inner dimension of the first surface 31x (from the inner surface of the first protrusion 32a to the inner surface of the second protrusion 32b). 31xAs shown in FIG. 6, the length L 31x is the height H of the opening 33 of the terminal 30 described later. 33 Alternatively, the length L of the first surface 31x of the base 31 may be the same as the length L of the first surface 31x of the base 31. 31x is the height H 33 The length L of the first surface 31x of the base 31 in the inner dimension may be smaller or larger than 31x is not particularly limited, and may be 4.8 mm or more and 99.8 mm or less, or 9.8 mm or more and 49.8 mm or less.

[0029] As shown in FIG. 6, the base 31 has a length (height) L 31y As shown in FIGS. 2 and 6, the base 31 may have a length L 31y is the thickness T of the terminal 30 30 (the length from the fourth surface 32ay of the first protrusion 32a to the sixth surface 32by of the second protrusion 32b). Alternatively, the length L 31y is the thickness T of the terminal 30 30 8, the first protrusion 32a and the second protrusion 32b may protrude from inside the outer edge of the first surface 31x of the base 31 toward the electrode stack 10. The length L 31y is not particularly limited, and may be 4.9 mm or more and 99.9 mm or less, or 9.9 mm or more and 49.9 mm or less.

[0030] As shown in FIG. 7, the base 31 has an inner dimension of the first surface 31x that is a width W along the stacking surface of the electrode stack 10. 31x As shown in FIG. 7, the width W 31x is the width W of the opening 33 of the terminal 30 described later. 33 Alternatively, the width W of the first surface 31x of the base 31 may be the same as the inner dimension of the width W 31x is the width W 33The width W of the first surface 31x of the base 31 may be smaller than 31x is not particularly limited, and may be 7.5 mm or more and 475 mm or less, or 30 mm or more and 195 mm or less.

[0031] As shown in FIG. 7, the base 31 has a width W 31y As shown in FIG. 7, the width W 31y is the width W of the opening 33 of the terminal 30 described later. 33 and the thickness T of the third protrusion 32c 32c and the thickness T of the fourth protrusion 32d 32d Alternatively, the width W of the second surface 31y of the base 31 may be the same as the sum of the width W of the second surface 31y and the width W of the second surface 31y of the base 31. 31y is the width W 33 and thickness T 32c and thickness T 32d The width W of the second surface 31y of the base 31 may be larger than the sum of the width W of the second surface 31y and the width W of the second surface 31y. 31y is not particularly limited, and may be 8.1 mm or more and 475.1 mm or less, or 30.1 mm or more and 195.1 mm or less.

[0032] On the first surface 31x of the base 31, the length (height) L 31x and width W 31x Relative to L 31x / W 31x is not particularly limited. In particular, the ratio L 31x / W 31x When the ratio is 0.01 or more and 13.3 or less, or 0.05 or more and 1.66 or less, the connectivity of the current collecting portion 20 to the terminal 30 and the strength of the terminal are easily ensured.

[0033] On the second surface 31y of the base 31, the length (height) L 31y and width W 31y Relative to L 31y / W 31y is not particularly limited. In particular, the ratio L 31y / W 31yWhen the ratio is 0.01 or more and 13.3 or less, or 0.05 or more and 1.66 or less, the connectivity of the current collecting portion 20 to the terminal 30 and the strength of the terminal are easily ensured.

[0034] 2.3.3.2 Protrusions The protrusion 32 protrudes from the base 31 toward the electrode stack 10. As shown in FIGS. 2, 3, and 5 to 7, the protrusion 32 may have a certain thickness and protrude linearly from the base 31 toward the electrode stack 10, except for the portion where the curved surface 30ax is formed. As shown in FIG. 2, the protrusion 32 may have a first protrusion 32a and a second protrusion 32b in one cross section. The first protrusion 32a has a third surface 32ax facing the second protrusion 32b and a fourth surface 32ay opposite the third surface 32ax. The second protrusion 32b has a fifth surface 32bx facing the first protrusion 32a and a sixth surface 32by opposite the fifth surface 32bx. Furthermore, as shown in FIG. 3, the protrusion 32 may have a third protrusion 32c and a fourth protrusion 32d in a cross section perpendicular to the one cross section. In this case, the third protrusion 32c may have a seventh surface 32cx facing the fourth protrusion 32d and an eighth surface 32cy opposite the seventh surface 32cx. The fourth protrusion 32d may have a ninth surface 32dx facing the third protrusion 32c and a tenth surface 32dy opposite the ninth surface 32dx.

[0035] In the battery 100, the thickness T of the protrusion 32 32 (For example, T in Figures 6 and 7 32a ~T 32d ) is not particularly limited. In particular, the thickness T 32 When the thickness is 0.1 mm or more and 10 mm or less, or 0.2 mm or more and 3 mm or less, the connectivity of the current collecting part 20 to the terminal 30 and the strength of the terminal are easily ensured. Note that the "thickness of the protrusion" referred to in this application is measured at the end face of the protrusion on the electrode stack side.

[0036] As shown in FIGS. 6 and 7, the protrusion 32 extends from the first surface 31x of the base 31 toward the electrode stack 10 by a protrusion length L 32The protrusion 32 may have a protrusion length L 32 is not particularly limited, and may be 3 mm or more and 50 mm or less, or 5 mm or more and 30 mm or less. 32 That is, the first protruding portion 32a, the second protruding portion 32b, the third protruding portion 32c, and the fourth protruding portion 32d may be flush with each other on the end surface on the electrode stack 10 side. Alternatively, the protruding length of a portion of the protruding portion 32 may be different from the protruding length of the other portion.

[0037] As shown in FIGS. 6 and 7, the thickness T 31 is the protrusion length L of the protrusion 32 32 The thickness T of the base 31 may be smaller than 31 By making the thickness T of the base 31 relatively thin, a space for inserting the current collecting part 20 becomes large. 31 and the protruding length L of the protruding portion 32 32 Relative to T 31 / L 32 may be, for example, greater than 0 and less than 1.0, 0.02 or greater and 0.5 or less, or 0.05 or greater and 0.25 or less.

[0038] 2, 3, and 5 to 7, in the terminal 30, the protrusion 32 may protrude from the outer edge of the base 31. That is, the planar shape of the second surface 31y of the base 31 may coincide with the shape defined by the outer periphery of the protrusion 32. Alternatively, as shown in FIG. 9, the protrusion 32 may protrude from inside the outer edge of the first surface 31x of the base 31. That is, the planar shape of the second surface 31y of the base 31 may be larger than the shape defined by the outer periphery of the protrusion 32.

[0039] When the protrusion 32 protrudes from the outer edge of the base 31, the shape defined by the outer periphery of the protrusion 32 corresponds to the planar shape of the second surface 31y of the base 31. For example, if the planar shape of the base 31 (the planar shape of the second surface 31y) is rectangular, the rectangle has a first side and a second side facing each other and a third side and a fourth side facing each other, and the protrusion 32 has the above-mentioned first protrusion 32a, second protrusion 32b, third protrusion 32c, and fourth protrusion 32d, the first protrusion 32a may protrude from the first side, the second protrusion 32b may protrude from the second side, the third protrusion 32c may protrude from the third side, and the fourth protrusion 32d may protrude from the fourth side. In this way, by having the protrusion 32 protrude from the outer edge of the rectangular base 31, the structural efficiency around the terminal and the strength of the terminal may be easily ensured.

[0040] Furthermore, for example, when the planar shape of the base 31 (the planar shape of the second surface 31y) is rectangular, the first protrusion 32a may protrude from one long side of the rectangle, the second protrusion 32b may protrude from the other long side of the rectangle, the third protrusion 32c may protrude from one short side of the rectangle, and the fourth protrusion 32d may protrude from the other short side of the rectangle. Having the protrusions 32 protrude from the outer edge of the rectangular base 31 in this manner facilitates ensuring the structural efficiency around the terminal and the strength of the terminal. Furthermore, forming a contact surface 30a with the current collecting part 20 on the long side facilitates further improving the connectivity between the terminal 30 and the current collecting part 20.

[0041] Furthermore, when the planar shape of the base 31 (the planar shape of the second surface 31y) is rectangular, the stacking direction in the electrode laminate 10 may be along the short side of the rectangle, and the width direction of the electrode laminate 10 may be along the long side of the rectangle. This makes it easy to ensure a large space for inserting the current collecting part 20, improves the connectivity between the terminal 30 and the current collecting part 20, and tends to provide an excellent balance between structural efficiency and strength around the terminal 30 and the current collecting part 20.

[0042] The first protrusion 32a may have a third surface 32ax facing the second protrusion 32b and a fourth surface 32ay opposite the third surface 32ax. As shown in FIG. 2, the third surface 32ax may be in contact with the current collecting unit 20. The third surface 32ax may have a joint with the current collecting unit 20. On the other hand, as shown in FIG. 2, the fourth surface 32ay may be an adhesive surface with the exterior body 40. The third surface 32ax and the fourth surface 32ay of the first protrusion 32a may have, for example, a flat surface as shown in the figure, or may have an uneven surface. As described above, the third surface 32ax may constitute the contact surface 30a including the curved surface 30ax. The planar shapes of the third surface 32ax and the fourth surface 32ay (referring to the planar shapes when the third surface and the fourth surface are projected) are not particularly limited. In particular, when the third surface 32ax and the fourth surface 32ay have a rectangular planar shape, the structural efficiency around the terminal 30 is likely to be improved, and the connectivity of the current collecting portion 20 to the terminal 30 and the strength of the terminal 30 are likely to be improved.

[0043] The second protrusion 32b may have a fifth surface 32bx facing the first protrusion 32a and a sixth surface 32by opposite the fifth surface 32bx. The fifth surface 32bx may or may not have a contact surface 30a with the current collecting unit 20. On the other hand, as shown in FIG. 2, the sixth surface 32by may be an adhesive surface with the exterior body 40. The fifth surface 32bx and the sixth surface 32by of the second protrusion 32b may be, for example, flat as shown in the figure, or may have an uneven surface. As described above, the fifth surface 32bx may constitute the contact surface 30a including the curved surface 30ax. The planar shapes of the fifth surface 32bx and the sixth surface 32by (referring to the planar shapes when the fifth surface and the sixth surface are projected) are not particularly limited. In particular, when the fifth surface 32bx and the sixth surface 32by have a rectangular planar shape, the structural efficiency around the terminal 30 is likely to be improved, and the connectivity of the current collecting portion 20 to the terminal 30 and the strength of the terminal 30 are likely to be improved.

[0044] The third protrusion 32c may have a seventh surface 32cx facing the fourth protrusion 32d and an eighth surface 32cy opposite the seventh surface 32cx. As shown in FIG. 3, the seventh surface 32cx does not need to contact the current collecting unit 20. On the other hand, as shown in FIG. 3, the eighth surface 32cy may be an adhesive surface for bonding to the exterior body 40. The seventh surface 32cx and the eighth surface 32cy of the third protrusion 32c may be flat, as shown in the figure, or may have irregularities. The planar shapes of the seventh surface 32cx and the eighth surface 32cy (meaning the planar shapes when the seventh surface and the eighth surface are projected) are not particularly limited. In particular, when the seventh surface 32cx and the eighth surface 32cy have a rectangular planar shape, the structural efficiency around the terminal 30 is likely to be improved, and the connectivity of the current collecting unit 20 to the terminal 30 and the strength of the terminal 30 are likely to be improved.

[0045] The fourth protrusion 32d may have a ninth surface 32dx facing the third protrusion 32c and a tenth surface 32dy opposite the ninth surface 32dx. As shown in FIG. 3, the ninth surface 32dx does not need to contact the current collecting unit 20. On the other hand, as shown in FIG. 3, the tenth surface 32dy may be an adhesive surface for bonding to the exterior body 40. The ninth surface 32dx and the tenth surface 32dy of the fourth protrusion 32d may be flat as shown in the figure, or may have irregularities. The planar shapes of the ninth surface 32dx and the tenth surface 32dy (referring to the planar shapes when the seventh and eighth surfaces are projected) are not particularly limited. In particular, when the ninth surface 32dx and the tenth surface 32dy have a rectangular planar shape, the structural efficiency around the terminal 30 is likely to be improved, and the connectivity of the current collecting unit 20 to the terminal 30 and the strength of the terminal 30 are likely to be improved.

[0046] 2.3.3.3 Aperture 2, 3, and 5 to 7, the terminal 30 may have an opening 33 on the electrode stack 10 side. In this case, the current collecting part 20 may be inserted into the opening 33 and connected to the terminal 30. The shape of the opening 33 may be defined by the protrusion 32. The shape of the opening 33 is not particularly limited. The shape of the opening 33 may be rectangular, circular, elliptical, or any other shape.

[0047] When the shape of the opening 33 is rectangular and the rectangle has a first side and a second side facing each other and a third side and a fourth side facing each other, the first protruding portion 32a of the protruding portion 32 may constitute the first side, the second protruding portion 32b may constitute the second side, the third protruding portion 32c may constitute the third side, and the fourth protruding portion 32d may constitute the fourth side. When the shape of the opening 33 defined by the protruding portion 32 is rectangular, it is easier to ensure structural efficiency around the terminal, strength of the terminal, and the like.

[0048] When the shape of the opening 33 is rectangular, the first protrusion 32a of the protrusion 32 may form one short side of the rectangle, the second protrusion 32b may form the other short side of the rectangle, the third protrusion 32c may form one long side of the rectangle, and the fourth protrusion 32d may form the other long side of the rectangle. In this case, too, it is easy to ensure the structural efficiency around the terminal and the strength of the terminal.

[0049] Furthermore, when the shape of the opening 33 is rectangular, the stacking direction in the electrode stack 10 may be along the short side of the rectangle, and the width direction of the electrode stack 10 may be along the long side of the rectangle. This makes it easy to ensure a large space for inserting the current collecting part 20, and also makes it easy to achieve an excellent balance between structural efficiency and strength around the terminal 30 and the current collecting part 20.

[0050] As shown in FIG. 6, the opening 33 has a height H 33 The height H of the opening 33 33 is not particularly limited. In particular, the height H of the opening 33 33 When the opening 33 is 4.8 mm or more and 99.8 mm or less, or 9.8 mm or more and 49.8 mm or less, the strength of the terminal 30 is easily ensured, and the insertion of the current collecting part 20 into the opening 33 and the joining of the current collecting part 20 to the terminal 30 are made easier.

[0051] As shown in FIG. 7, the opening 33 has a width W33 The width W of the opening 33 33 In particular, the width W of the opening 33 is not limited to a specific value. 33 When the width W of the current collecting portion 20 is 7.5 mm or more and 475 mm or less, or 30 mm or more and 195 mm or less, the strength of the terminal 30 is easily ensured, and 20 is easily secured.

[0052] Height H of opening 33 33 and width W 33 Relative to H 33 / W 33 is not particularly limited. In particular, the ratio H 33 / W 33 When the ratio is 0.01 or more and 13.3 or less, or 0.05 or more and 1.66 or less, the bonding property of the current collecting portion 20 and the strength of the terminal 30 tend to be excellent.

[0053] 2.3.4 Other matters regarding terminals As mentioned above, the base 31 has a thickness T 31 and the protrusion 32 has a thickness T 32 Here, the thickness T of the base 31 31 and the thickness T of the first protrusion 32a. 32a and the thickness T of the second protrusion 32b 32b The relationship between them is not particularly limited. In particular, when the base 31 is thicker than the first protruding portion 32a and the second protruding portion 32b, the structural efficiency around the terminal and the strength of the terminal are likely to be improved.

[0054] In addition, the thickness T of the base 31 31 and the thickness T of the third protrusion 32c. 32c and the thickness T of the fourth protrusion 32d 32d The relationship between them is not particularly limited. In particular, when the base 31 is thicker than the third protruding portion 32c and the fourth protruding portion 32d, the structural efficiency around the terminal and the strength of the terminal are likely to be improved.

[0055] The terminal 30 can be easily manufactured by, for example, pressing a metal material using a punch or the like to form the desired concave shape, cutting a metal material to form the desired concave shape, or electrical discharge machining a metal material to form the desired concave shape. The material of the terminal 30 may be appropriately selected taking into consideration sufficient conductivity, appropriate mechanical strength, and the like. For example, the material of the terminal 30 may be aluminum, copper, iron, nickel, or an alloy thereof. The terminal 30 may be formed by plating any of the above metals or alloys onto a substrate.

[0056] An insulating layer may be provided between the terminal 30 and the electrode stack 10. This further facilitates suppression of short circuits and the like in the battery 100. For example, as shown in FIG. 10 , the protruding portion 32 of the terminal 30 may have an insulating layer 35 on the end surface facing the electrode stack 10. For example, the insulating layer 35 can be formed on the end surface of the protruding portion 32 of the terminal 30 by applying or transferring an insulating resin material (e.g., ultraviolet-curable resin such as an acrylic monomer / oligomer; thermosetting resin such as an epoxy resin or an imide resin; or thermoplastic resin such as polypropylene or polyethylene) to the end surface of the protruding portion 32 of the terminal 30, or by forming a layer made of a metal oxide (e.g., aluminum oxide) on the end surface by anodizing or the like. The thickness of the insulating layer 35 is not particularly limited. When the insulating layer 35 is made of an insulating resin material, its thickness may be, for example, 0.1 mm or more and 1.0 mm or less. When the insulating layer 35 is made of a metal oxide formed by anodizing or the like, its thickness may be, for example, 0.01 mm or more and less than 0.10 mm.

[0057] 2.4 Supplementary information on the arrangement of electrode stacks, current collectors, and terminals In the battery 100, there are no particular limitations on the arrangement of the electrode laminate 10, the current collecting parts 20, and the terminals 30, as long as the current collecting parts 20 protruding from the electrode laminate 10 are electrically connected to a predetermined surface of the terminals 30. In the battery 100, by employing terminals 30 having the above-described specific shapes, it is easy to save space around the terminals 30 and the current collecting parts 20, and it is easy to improve the connectivity of the current collecting parts 20 to the terminals 30. Below, a supplementary explanation of an example of the arrangement of the electrode laminate 10, the current collecting parts 20, and the terminals 30 will be provided.

[0058] 2.4.1 Terminal width and current collecting part width As described above, the current collecting part 20 protruding from the electrode stack 10 may be inserted into the opening 33 of the terminal 30 and connected to a predetermined surface of the terminal 30. Here, when a large current flows through the current collecting part 20 and the terminal 30, heat may be generated in the current collecting part 20 and the terminal 30. According to the knowledge of the present inventors, the heat generation temperature around the terminal 30 and the current collecting part 20 varies depending on the width of the current collecting part 20 relative to the width of the terminal 30. As shown in FIG. 3, for example, when the width W of the opening 33 of the terminal 30 is 33 Width W of the current collecting part 20 20 Ratio of W 20 / W 33 When the inner width W of the base 31 of the terminal 30 is 0.9 or more, it is possible to significantly suppress heat generation around the terminal 30 and the current collecting portion 20. 31x Width W of the current collecting portion 20 relative to (width of the inner dimension of the first surface 31x) 20 Ratio of W 20 / W 31x Similarly, when the ratio is 0.9 or more, heat generation around the terminal 30 and the current collecting portion 20 can be significantly suppressed.

[0059] 2.4.2 Electrode laminate thickness and terminal thickness Thickness T of terminal 30 30 is the thickness T of the electrode laminate 10 10 In particular, as shown in FIG. 2, the thickness T 30However, if the thickness is thinner than the thickness of the electrode laminate 10, it becomes easier to further improve the adhesion between the exterior body and the terminal 30 by, for example, placing resin 34 between the laminate exterior body and the terminal 30.

[0060] 2.4.3 Joint form between current collector and terminal As described above, the current collecting part 20 contacts the contact surface 30a of the terminal 30. The current collecting part 20 may be bonded to a portion of the contact surface 30a of the terminal 30 to form a bonded part 25. In one embodiment, the current collecting part 20 may be bonded to at least a portion of the contact surface 30a of the terminal 30 by ultrasonic bonding or laser bonding.

[0061] 2.5 Other materials The battery 100 may include other obvious components of a battery in addition to the electrode stack 10, the current collector 20, and the terminal 30. For example, various components such as those disclosed in Patent Document 1 (JP 2023-084066 A) may be employed as other components. An example of other components included in the battery 100 will be described below.

[0062] 2.5.1 Exterior The battery 100 may have an exterior body 40 that houses the electrode stack 10 and the current collecting portion 20. The exterior body may be made of a laminate film (laminated exterior body) or a metal case. As shown in the figure, the electrode stack 10 and the current collecting portion 20 may be housed in the laminate exterior body, and the laminate exterior body may be bonded to the fourth surface 32ay of the first protrusion 32a and the sixth surface 32by of the second protrusion 32b.

[0063] The exterior body 40 may be, for example, a cylindrical body having an opening. That is, as shown in Figures 2 and 3, the electrode stack 10 and the current collecting part 20 are housed inside the cylindrical exterior body 40, and the outer surface of the protrusion 32 of the terminal 30 can be adhered and sealed near the opening of the exterior body 40. In this case, as shown in Figures 2 and 3, the vicinity of the opening of the exterior body 40 and the protrusion 32 of the terminal 30 can be adhered so as to overlap each other when viewed in the stacking direction of the electrode stack 10. This can improve the sealing performance of the battery 100 and the structural efficiency around the terminal 30.

[0064] As shown in FIG. 10, the length L between the end face (or opening 33) of the terminal 30 on the electrode stack 10 side and the opening 41 of the exterior body 40 is 41 is not particularly limited. In particular, the length L 41 When the protrusion length L of the protrusion 32 is 1.0 mm or more and 20 mm or less, or 3.0 mm or more and 15 mm or less, a good balance between sealing performance and structural efficiency is likely to be achieved. 32 The above length L 41 The ratio of L 41 / L 32 In particular, the ratio L 41 / L 32 When the ratio is 0.1 or more and 1.0 or less, or 0.5 or more and 1.0 or less, a good balance between sealing performance and structural efficiency is likely to be achieved. When the exterior body 40 is a laminate exterior body, the laminate exterior body may be bonded to the outer surface of the protrusion 32 by heat sealing or the like, for example. When the exterior body 40 is a metal case, the metal case may be bonded to the outer peripheral surface of the protrusion 32 by welding or using an adhesive, for example. As described above, a resin 34 may be disposed between the outer surface of the protrusion 32 and the exterior body 40.

[0065] 2.5.2 Busbars The battery 100 may include a conductive member for connecting one battery to another. For example, in the battery 100, a bus bar may be connected to the terminal 30. A plurality of batteries 100 may be combined to form an assembled battery.

[0066] 3.Applications Battery 100 has a wide range of applications. For example, battery 100 can be suitably used in at least one type of vehicle selected from a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), and an electric vehicle (BEV). In other words, the technology of the present disclosure also has an aspect of a vehicle having battery 100 of the present disclosure. [Explanation of symbols]

[0067] 100 batteries 10 Electrode laminate 20 Current collector 25 Joint 30 terminals 30a contact surface 30ax curved surface 30ay flat surface 31 Base 31x 1st side 31y 2nd side 32 Protrusion 32a 1st protrusion 32ax 3rd side 32ay 4th page 32b Second protrusion 32bx 5th side 32by 6th page 32c Third protrusion 32cx 7th side 32cy side 8 32d 4th protrusion 32dx 9th page 32dy side 10 33 Aperture 34 Resin 35 Insulating layer 40 Exterior body 41 Aperture

Claims

1. A battery having an electrode stack, a current collector, and a terminal, the current collecting portion protrudes from the electrode stack, the terminal has a contact surface with the current collecting portion, the contact surface includes a curved surface; The curved surface bulges out toward the opposite side to the current collecting portion. battery.

2. 10. The battery of claim 1, the electrode stack and the current collecting portion are housed in an exterior body, the terminal has the contact surface inside the exterior body, The terminal has an exposed surface facing the outside of the exterior body. battery.

3. 10. The battery of claim 1, The terminal has a base and a protrusion, the base has a first surface and a second surface opposite the first surface; the protruding portion protrudes from the base portion toward the electrode stack, the protrusion has a first protrusion and a second protrusion, the first protruding portion has a third surface facing the second protruding portion and a fourth surface opposite to the third surface, the second protruding portion has a fifth surface facing the first protruding portion and a sixth surface opposite to the fifth surface, At least one of the first surface, the third surface, and the fifth surface has the contact surface. battery.

4. 4. The battery of claim 3, the electrode stack and the current collecting portion are housed in an exterior body, the first surface, the third surface, and the fifth surface face the interior of the exterior body; the second surface faces the exterior of the exterior body, The fourth surface and the sixth surface are bonded to the exterior body. battery.

5. 5. The battery according to claim 3 or 4, The planar shape of the base is rectangular, the protrusion has a third protrusion and a fourth protrusion, the rectangle has first and second sides opposed to each other and third and fourth sides opposed to each other, the first protruding portion protrudes from the first side, the second protruding portion protrudes from the second side, the third protruding portion protrudes from the third side, the fourth protrusion protrudes from the fourth side; battery.

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