Battery

Abstract

To disclose a battery capable of improving the impact resistance of terminals and current collectors.SOLUTION: A battery disclosed herein comprises an electrode laminate, a current collector, and terminals. The electrode laminate is electrically connected to the terminal via the current collector. The terminal has a base and a protruding portion. The base has a first surface facing the electrode laminate side and a second surface on the opposite side from the first surface. The protruding portion extends from the base toward the electrode laminate. The protruding portion has a first protruding portion and a second protruding portion. The first protruding portion has a third surface facing the second protruding portion side and a fourth surface on the opposite side from the third surface. The second protruding portion has a fifth surface facing the first protruding portion side and a sixth surface on the opposite side from the fifth surface. The current collector is bonded to one or both of the third surface and the fifth surface.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 the impact resistance of 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 electrode stack is electrically connected to the terminal via the current collecting portion, The terminal has a base and a protrusion, the base portion has a first surface facing the electrode stack and a second surface opposite to 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, The current collecting portion is bonded to one or both of the third surface and the fifth surface. battery. <Aspect 2> 2. The battery of embodiment 1, The current collecting portion is bonded to the first surface. battery. <Aspect 3> 3. The battery of embodiment 1 or 2, The current collecting portion is bonded to both the third surface and the fifth surface. battery. <Aspect 4> 2. The battery of embodiment 1, the current collecting portion passes near the third surface and the first surface and is joined to the fifth surface; battery. <Aspect 5> The battery of any one of Aspects 1 to 4, The base is thicker than the first protruding portion and the second protruding portion. battery. <Aspect 6> The battery of any one of Aspects 1 to 5, the protrusion has a third protrusion and a fourth protrusion, the third protruding portion has a seventh surface facing the fourth protruding portion and an eighth surface opposite to the seventh surface, The fourth protruding portion has a ninth surface facing the third protruding portion and a tenth surface opposite to the ninth surface. battery. <Aspect 7> 7. The battery of embodiment 6, The base portion is thicker than the third protruding portion and the fourth protruding portion. battery. <Aspect 8> 8. The battery of embodiment 6 or 7, The planar shape of the base is rectangular, 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. <Aspect 9> 8. The battery of embodiment 6 or 7, The planar shape of the base is rectangular, the first protrusion protrudes from one long side of the rectangle, the second protrusion protrudes from the other long side of the rectangle, the third protrusion protrudes from one short side of the rectangle, The fourth protrusion protrudes from the other short side of the rectangle. battery. <Aspect 10> 10. The battery of embodiment 9, The stacking direction of the electrode stack is along the short side, The width direction of the electrode stack is along the long side. battery. <Aspect 11> The battery of any one of Aspects 1 to 10, The protrusion protrudes from the outer edge of the base. battery. <Aspect 12> The battery of any one of Aspects 1 to 11, The ratio of the width of the current collecting portion to the inner width of the base is 0.9 or more. battery. <Aspect 13> The battery of any one of Aspects 1 to 12, The thickness of the base portion is smaller than the protrusion length of the protrusion portion. battery. <Aspect 14> The battery of any one of Aspects 1 to 13, The thickness of the terminal is smaller than the thickness of the electrode laminate. battery. <Aspect 15> The battery of any one of Aspects 1 to 14, The protrusion has an insulating layer on an end surface facing the electrode stack. battery. <Aspect 16> The battery of any one of Aspects 1 to 15, the electrode stack and the current collecting portion are housed in a laminate exterior body, The laminate exterior body is adhered to the fourth surface and the sixth surface. battery. [Effects of the Invention]

[0006] The battery of the present disclosure has excellent impact resistance in the terminals and current collectors. For example, even if an impact is applied to the base of the terminal by some member, the impact is unlikely to be transmitted to the current collectors. [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 in 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] 10A and 10B are schematic diagrams illustrating other examples of cross-sectional shapes of terminals. [Figure 9] 10A and 10B are schematic diagrams illustrating other examples of connection between terminals and current collecting portions. [Figure 10] 10A and 10B are schematic diagrams illustrating other examples of connection between terminals and current collecting portions. [Figure 11] 10A and 10B are schematic diagrams illustrating other examples of connection between terminals and current collecting portions. [Figure 12] 10A and 10B are schematic diagrams illustrating other examples of connection between terminals and current collecting portions. [Figure 13] 10A and 10B are schematic diagrams illustrating other examples of connection between terminals and current collecting portions. [Figure 14] 10A and 10B are schematic diagrams illustrating other examples of connection between terminals and current collecting portions. [Figure 15] 10 is a schematic diagram showing an example of a cross-sectional shape of a terminal when an insulating layer is provided on a part of the terminal. [Figure 16] 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. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, one embodiment of the battery of the present disclosure will be described, but the battery of the present disclosure is not limited to the following embodiment.

[0009] 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 electrode stack 10 is electrically connected to the terminal 30 via the current collector 20. The terminal 30 includes a base 31 and a protruding portion 32. The base 31 includes a first surface 31x facing the electrode stack 10 and a second surface 31y opposite the first surface 31x. The protruding portion 32 protrudes from the base 31 toward the electrode stack 10. The protruding portion 32 includes a first protruding portion 32a and a second protruding portion 32b. The first protruding portion 32a includes a third surface 32ax facing the second protruding portion 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 to the fifth surface 32bx. The current collecting portion 20 is joined to one or both of the third surface 32ax and the fifth surface 32bx.

[0010] 1. Electrode laminate 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.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 2. Current collecting section The current collecting portion 20 protrudes from the electrode stack 10 toward the terminal 30, and electrically connects the electrode stack 10 and the terminal 30. More specifically, as shown in Figures 2 and 3, a part of the current collecting portion 20 including the tip on the terminal 30 side is joined to one or both of the third surface 32ax and the fifth surface 32bx of the terminal 30.

[0017] 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, 10 to 200, 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.

[0018] 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.

[0019] 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.

[0020] 3. Terminals As shown in FIGS. 2, 3, and 5 to 7, the terminal 30 has a base 31, a first protrusion 32a, and a second protrusion 32b. As shown in FIGS. 2 and 3, a first surface 31x of the base 31 on the electrode stack 10 side may face the inside of the battery, and a second surface 31y on the opposite side from the electrode stack 10 may face the outside of the battery 100. As shown in FIG. 6, a third surface 32ax of the first protrusion 32a facing the second protrusion 32b may face the inside of the battery, and a fourth surface 32ay opposite the third surface 32ax may be bonded to the exterior body 40. As shown in FIG. 6, a fifth surface 32bx of the second protrusion 32b facing the first protrusion 32a may face the inside of the battery, and a sixth surface 32by opposite the fifth surface 32bx may be bonded to the exterior body 40.

[0021] 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 not be in contact with the current collector 20, or may be in contact with the current collector 20 as described below 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 flat, as shown in the drawings, or may have irregularities. The planar shapes of the first surface 31x and the second surface 31y (referring to the planar shapes when the first surface and the second surface are 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.

[0022] As shown in FIGS. 6 and 7, the base 31 has a thickness T 31 (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.

[0023] 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). 31x As 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.

[0024] As shown in FIG. 6, the base 31 has a length (height) L 31y As shown in FIG. 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 30 308, 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. 31y is the above length L 31x The thickness T 10 The length L of the base 31 at the second surface 31y may be smaller than 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.

[0025] 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 It may be the same as the width W 31x is the width W mentioned above 20 It may be larger than the width W 31x is the width W described below 31y Alternatively, the width W of the first surface 31x of the base 31 may be smaller than the width W of the first surface 31x. 31x is the width W 33 The 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.

[0026] 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 32cand thickness T 32d The width W 31y is the width W 31x and width W 33 It may be larger than the width W 31y is the width W 10 The width W of the second surface 31y of the base 31 may be smaller than 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.

[0027] 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.

[0028] 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 31y 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.

[0029] 3.2 Protrusion 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 protrude linearly from the base 31 toward the electrode stack 10 while having a certain thickness. As shown in FIG. 2, the protrusion 32 has 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.

[0030] 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.

[0031] 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 32 The 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. 32That 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.

[0032] 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 protrusion length L of the protrusion 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.

[0033] 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.

[0034] 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 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 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, it is easier to ensure the structural efficiency around the terminal and the strength of the terminal.

[0035] 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, connecting the current collecting part 20 to the first protrusion 32a or the second protrusion 32b protruding from at least the long side of the base 31 facilitates improving the connectivity of the current collecting part 20 to the terminal 30.

[0036] 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, 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.

[0037] 3.2.1 First protrusion The first protrusion 32a has 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 also have a joint 25 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 be flat, as shown in the figure, or may have an uneven surface. 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.

[0038] 3.2.2 Second protrusion The second protrusion 32b has a fifth surface 32bx facing the first protrusion 32a and a sixth surface 32by opposite the fifth surface 32bx. As shown in FIG. 2, the fifth surface 32bx does not need to be in contact with the current collecting unit 20. Alternatively, as described below, the fifth surface 32bx may be in contact with the current collecting unit 20 or may have a joint 25 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 flat as shown in the figure, or may have an uneven surface. 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.

[0039] 3.2.3 Third protrusion 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.

[0040] 3.2.4 Fourth protrusion 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.

[0041] 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.

[0042] 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.

[0043] When the shape of the opening 33 is rectangular, the first protrusion 32a of the protrusion 32 may form one long side of the rectangle, the second protrusion 32b may form the other long side of the rectangle, the third protrusion 32c may form one short side of the rectangle, and the fourth protrusion 32d may form the other short side of the rectangle. In this case, too, the structural efficiency around the terminal and the strength of the terminal can be easily ensured.

[0044] 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.

[0045] 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. For example, the height H33 is the length L 31x The height H 33 is the length L 31y It may be smaller than the height H 33 is the thickness T 10 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.

[0046] As shown in FIG. 7, the opening 33 has a width W 33 The width W of the opening 33 33 is not particularly limited. 33 is the width W 20 Larger than width W 33 is the width W 31x It may be the same as the width W 33 is the width W 31y The width W 33 is the width W 10 In particular, the width W of the opening 33 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.

[0047] 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.

[0048] 3.4 Other matters regarding terminals As mentioned above, the base 31 has a thickness T 31and 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.

[0049] 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.

[0050] As described above, in the battery 100, the current collecting part 20 is joined to the third surface 32ax of the first protrusion 32a of the terminal 30 and / or the fifth surface 32bx of the second protrusion 32b. In the battery 100, the second surface 31y of the base 31 of the terminal 30 can function, for example, as a surface against which a probe for passing a large current through the battery 100 is pressed, or as a surface for connecting batteries 100 to each other. In this regard, the base 31 is more susceptible to impacts from external members than the protrusion 32. In the battery 100, the current collecting part 20 is joined to the protrusion 32, which is a part less susceptible to impacts from external members, thereby improving the impact resistance of the terminal 30 and the current collecting part 20.

[0051] While FIGS. 2 and 3 show a configuration in which the current collecting portion 20 is connected to the third surface 32ax of the first protrusion 32a of the terminal 30, the configuration of the battery of the present disclosure is not limited thereto. For example, as shown in FIG. 9, the current collecting portion 20 may be connected to the fifth surface 32bx of the second protrusion 32b of the terminal 30. Also, as shown in FIG. 9, the current collecting portion 20 may be bonded to the fifth surface 32bx while passing near the third surface 32ax and the first surface 31x. "Passing near the third surface and the first surface" means that the current collecting portion 20 is not "bonded" to the third surface 32ax and the first surface 31x. However, the current collecting portion 20 may be "in contact" with the third surface 32ax and the first surface 31x. "Near the third surface" and "near the first surface" refer to a distance within 5 mm from each surface. Even in this case, the impact resistance of the terminal 30 and the current collecting portion 20 is improved, as described above. Furthermore, when the current collecting portion 20 passes near the third surface 32ax and the first surface 31x and is joined to the fifth surface 32bx, the length of the current collecting portion 20 from the electrode stack 10 to the joint 25 becomes longer, which reduces tension on the current collecting portion 20 and makes it less likely that impacts from the terminal 30 will be transmitted to the current collecting portion 20 and the electrode stack 10.

[0052] As shown in Figures 10 and 11, the current collecting part 20 may be bonded to the first surface 31x. Also, as shown in Figure 12, the current collecting part 20 may be bonded to both the third surface 32ax and the fifth surface 32bx. Furthermore, as shown in Figure 13, the current collecting part 20 may be bonded to the first surface 31x, the third surface 32ax, and the fifth surface 32bx. It is believed that by bonding the current collecting part 20 to at least two surfaces of the terminal 30 as shown in Figures 10 to 13, the impact resistance of the terminal 30 and the current collecting part 20 is further improved.

[0053] 2, 3, and 9 to 13 illustrate an example in which a plurality of current collectors protruding from the side surface 10z of the electrode laminate 10 toward the terminal 30 are bundled together to form the current collecting section 20. However, the configuration of the current collecting section 20 is not limited thereto. In the current collecting section 20, a plurality of current collectors protruding from the side surface 10z of the electrode laminate 10 toward the terminal 30 may be bundled together. A plurality of such bundles may be present in the thickness direction or width direction of the electrode laminate 10. The number of such bundles is not particularly limited. For example, as shown in FIG. 14, a plurality of current collectors protruding from the side surface 10z of the electrode laminate 10 toward the terminal 30 may be bundled together into two bundles, one of which is connected to the third surface 32ax of the first protrusion 32a of the terminal 30, and the other of which is connected to the fifth surface 32bx of the second protrusion 32b of the terminal 30. In this way, the multiple collectors protruding from the side surface 10z of the electrode laminate 10 toward the terminal 30 are grouped into multiple bundles, and the multiple bundles are joined to at least two surfaces of the terminal 30, which is thought to further improve the impact resistance of the terminal 30 and the current collecting portion 20.

[0054] The terminal 30 having the base 31 and the protrusion 32 (and the opening 33) can be manufactured, for example, by press-molding a metal. For example, the base 31 and the protrusion 32 (and the opening 33) may be formed by applying pressure to one surface of a metal member having a predetermined shape (for example, a rectangular parallelepiped) to form projections and recesses.

[0055] The material of the terminal 30 may be appropriately selected taking into consideration sufficient conductivity, appropriate heat capacity, appropriate mechanical strength, etc. 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. 15 , the protruding portion 32 of the terminal 30 may have an insulating layer 36 on the end surface facing the electrode stack 10. For example, the insulating layer 36 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 36 is not particularly limited. When the insulating layer 36 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 36 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] 4. Supplementary information on the arrangement of electrode laminates, 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 joined 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] 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] 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 30 However, 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 35 between the laminate exterior body and the terminal 30.

[0060] 4.3 Joint configuration between current collector and terminal As described above, the current collecting portion 20 is bonded to a specific surface of the terminal 30. For example, the current collecting portion 20 may be bonded to a specific surface of the terminal 30 to form the bonded portion 25. In one embodiment, the current collecting portion 20 may be ultrasonically or laser bonded to one or both of the third surface 32ax and the fifth surface 32bx.

[0061] 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] 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 Figures 2 and 3, the electrode stack 10 and the current collecting portion 20 may be housed in a 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. 16, the length L between the end face (or opening 33) of the protrusion 32 of the terminal 30 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 L41 / 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 35 may be disposed between the outer surface of the protrusion 32 and the exterior body 40.

[0065] 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] 6. Battery manufacturing method The electrode laminate 10 and the current collecting part 20 can be produced by known methods. The method for producing the terminal 30 and the method for joining the current collecting part 20 to the terminal 30 are as described above. The method for enclosing and sealing the electrode laminate 10 and the like in the exterior body 40 is not particularly limited. As described above, known methods such as heat sealing the laminate exterior body can be used.

[0067] 7.Applications The battery 100 has a wide range of applications. For example, the 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). That is, the technology of the present disclosure relates to a vehicle having a battery 100, wherein the battery 100 has an electrode stack 10, a current collector 20, and a terminal 30, the electrode stack 10 is electrically connected to the terminal 30 via the current collector 20, the terminal 30 has a base 31 and a protruding portion 32, the base 31 has a first surface 31x facing the electrode stack 10 and a second surface 31y opposite to the first surface 31x, the protruding portion 32 protruding from the base 31 toward the electrode stack 10, and the protruding portion 32 is electrically connected to the electrode stack 10 via the current collector 20. The portion 32 has a first protrusion 32a and a second protrusion 32b, 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, and the current collecting portion 20 is joined to one or both of the third surface 32ax and the fifth surface 32bx. [Explanation of symbols]

[0068] 100 batteries 10 Electrode laminate 20 Current collector 25 Joint 30 terminals 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 35 Resin 36 Insulating layer 40 Exterior body 41 Aperture

Claims

1. A battery having an electrode stack, a current collector, and a terminal, the electrode stack is electrically connected to the terminal via the current collecting portion, The terminal has a base and a protrusion, the base portion has a first surface facing the electrode stack and a second surface opposite to 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, The current collecting portion is bonded to one or both of the third surface and the fifth surface. battery.

2. 10. The battery of claim 1, The current collecting portion is bonded to the first surface. battery.

3. 10. The battery of claim 1, The current collecting portion is bonded to both the third surface and the fifth surface. battery.

4. 10. The battery of claim 1, the current collecting portion passes near the third surface and the first surface and is joined to the fifth surface; battery.

5. 10. The battery of claim 1, The base portion is thicker than the first protruding portion and the second protruding portion. battery.

6. 10. The battery of claim 1, the protrusion has a third protrusion and a fourth protrusion, the third protruding portion has a seventh surface facing the fourth protruding portion and an eighth surface opposite to the seventh surface, the fourth protruding portion has a ninth surface facing the third protruding portion and a tenth surface opposite to the ninth surface; battery.

7. 7. The battery of claim 6, The base portion is thicker than the third protruding portion and the fourth protruding portion. battery.

8. 7. The battery of claim 6, The planar shape of the base is rectangular, 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.

9. 7. The battery of claim 6, The planar shape of the base is rectangular, the first protrusion protrudes from one long side of the rectangle, the second protrusion protrudes from the other long side of the rectangle; the third protrusion protrudes from one short side of the rectangle, The fourth protrusion protrudes from the other short side of the rectangle. battery.

10. 10. The battery of claim 9, The stacking direction of the electrode stack is along the short side, The width direction of the electrode stack is along the long side. battery.

11. 10. The battery of claim 1, The protrusion protrudes from the outer edge of the base. battery.

12. The battery according to any one of claims 1 to 11, The ratio of the width of the current collecting portion to the inner width of the base is 0.9 or more. battery.

13. The battery according to any one of claims 1 to 11, The thickness of the base portion is smaller than the protrusion length of the protrusion portion. battery.

14. The battery according to any one of claims 1 to 11, The thickness of the terminal is smaller than the thickness of the electrode laminate. battery.

15. The battery according to any one of claims 1 to 11, The protrusion has an insulating layer on an end surface facing the electrode stack. battery.

16. The battery according to any one of claims 1 to 11, the electrode stack and the current collecting portion are housed in a laminate exterior body, The laminate exterior body is adhered to the fourth surface and the sixth surface. battery.

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