Battery and manufacturing method of battery

Abstract

To disclose a battery capable of improving connectivity between a terminal and a current collector while improving structural efficiency around the terminal and the current collector.SOLUTION: A battery includes an electrode laminate, a current collector, and a terminal. The electrode laminate is electrically connected to the terminal via the current collector. The terminal includes a base portion and a protruding portion. The base portion has a first surface facing the electrode laminate and a second surface opposite to the first surface. The protrusion protrudes from the base portion toward the electrode laminate side. The protrusion portion includes a first protrusion portion and a second protrusion portion. The first protrusion portion has a third surface facing the second protrusion portion. The second protrusion portion has a fourth surface facing the first protrusion portion. The current collector is in contact with one or both of the first surface and the third surface. The second protrusion portion is welded to the base portion.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] This application discloses a battery and a method for manufacturing the 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 while ensuring 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 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 protrusion has a third surface facing the second protrusion, the second protrusion has a fourth surface facing the first protrusion, the current collecting portion is in contact with one or both of the first surface and the third surface; the second protrusion is welded to the base; battery. <Aspect 2> 2. The battery of embodiment 1, The base is thicker than the first protruding portion and the second protruding portion. battery. <Aspect 3> 3. The battery of embodiment 1 or 2, The protrusion has a third protrusion and a fourth protrusion. battery. <Aspect 4> 4. The battery of embodiment 3, The base portion is thicker than the third protruding portion and the fourth protruding portion. battery. <Aspect 5> 5. The battery of embodiment 3 or 4, one or both of the third protrusion and the fourth protrusion are welded to at least one of the base, the first protrusion, and the second protrusion; battery. <Aspect 6> The battery of any one of Aspects 3 to 5, 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 7> The battery of any one of Aspects 3 to 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. <Aspect 8> 8. The battery of embodiment 7, 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 9> The battery of any one of Aspects 1 to 8, The protrusion protrudes from the outer edge of the base. battery. <Aspect 10> The battery of any one of Aspects 1 to 9, The ratio of the width of the current collecting portion to the inner width of the base is 0.9 or more. battery. <Aspect 11> The battery of any one of Aspects 1 to 10, The thickness of the base portion is smaller than the protrusion length of the protrusion portion. battery. <Aspect 12> The battery of any one of Aspects 1 to 11, The thickness of the terminal is smaller than the thickness of the electrode laminate. battery. <Aspect 13> The battery of any one of Aspects 1 to 12, A bus bar is connected to the terminal. battery. <Aspect 14> The battery of any one of Aspects 1 to 13, The current collecting portion is ultrasonically bonded or laser bonded to one or both of the first surface and the third surface. battery. <Aspect 15> The battery of any one of Aspects 1 to 14, the first protruding portion and the second protruding portion have 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 first protrusion has a fifth surface opposite to the third surface, the second protrusion has a sixth surface opposite to the fourth surface, the electrode stack and the current collecting portion are housed in a laminate exterior body, The laminate exterior body is adhered to the fifth surface and the sixth surface. battery. <Aspect 17> A method for producing the battery of any one of Aspects 1 to 16, comprising: Connecting the current collecting portion to a first metal member; and welding a second metal member to the first metal member to which the current collecting portion is connected; Including, the base and the first protrusion of the terminal are formed by the first metal member; The second metal member constitutes the second protrusion of the terminal. How batteries are manufactured. [Effects of the Invention]

[0006] According to the technology of the present disclosure, the structural efficiency around the terminals and current collectors of the battery is likely to be improved (space is likely to be saved), and the terminals and current collectors are easily connected. [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] 1 is a schematic diagram illustrating an example of the external shape of a terminal, with welded portions omitted. [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 an example of an outer surface shape of the base. [Figure 9] 2A and 2B are schematic diagrams illustrating an example of a cross-sectional shape of a terminal. [Figure 10] 10 is a schematic diagram showing an example of a cross-sectional shape when an insulating layer is provided on a part of a terminal. [Figure 11] 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 12] 1 shows an example of the flow of a battery manufacturing method. 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.Battery As shown in FIGS. 1 to 8 , 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. The second protruding portion 32b includes a fourth surface 32bx facing the first protruding portion 32a. The current collecting portion 20 is in contact with one or both of the first surface 31x and the third surface 32ax. The second protrusion 32b is welded to the base 31.

[0010] 1.1 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. 10may be, for example, 10 mm or more and 500 mm or less, or 50 mm or more and 200 mm or less.

[0016] 1.2 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 FIGS. 2 and 3 , a part of the current collecting portion 20 including the tip on the terminal 30 side can be connected to one or both of the first surface 31x and the third surface 32ax of the terminal 30.

[0017] 2 and 3, the current collecting part 20 may be, for example, a bundle of multiple current collectors that protrude from the side surface 10z of the electrode laminate 10 toward the terminal 30. The number of current collectors that protrude 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.

[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 20is 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] 1.3 Terminals As shown in FIGS. 2, 3, and 5 to 8, 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 be connected to the current collector 20, and a second surface 31y on the opposite side of the electrode stack 10 may face the outside of the battery 100. Also, 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 be connected to the current collector 20. The first protrusion 32a may have a fifth surface 32ay opposite the third surface 32ax, and the fifth surface 32ay may be bonded to the exterior body 40. Also, as shown in FIG. 6, a fourth surface 32bx of the second protrusion 32b facing the first protrusion 32a may face the inside of the battery. The second protruding portion 32b may have a sixth surface 32by opposite to the fourth surface 32bx, and the sixth surface 32by may be bonded to the exterior body 40.

[0021] 1.3.1 Base As shown in FIGS. 2, 3, and 5 to 8, the base 31 may have a first surface 31x facing the electrode laminate 10 and a second surface 31y on the opposite side from 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 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 third protrusion 32c to the inner surface of the fourth protrusion 32d). 31x As shown in FIG. 6, the length L 31xis 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. 7, the base 31 may have a length L 31y is the thickness T of the terminal 30 30 (the length from the fifth 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 9, 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 the above L 31x may be larger than the above T 10 It may be smaller than L 31y may be, for example, 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 Alternatively, the width W of the first surface 31x of the base 31 may be the same as the inner dimension. 31x is the width W 33The width W of the first surface 31x of the base 31 may be smaller than 31x is the above-mentioned W 20 It can be larger than W 31y may be smaller than the above-mentioned W 10 It can be smaller than W 31x may be, for example, 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 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 the above-mentioned W 20 may be larger than the above-mentioned W 31x may be larger than the above-mentioned W 33 may be larger than the above-mentioned W 10 It can be smaller than W 31y may be, for example, 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] 1.3.2 Protrusions The protrusion 32 protrudes from the base 31 toward the electrode stack 10. As shown in FIGS. 2, 3, and 5 to 8, 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. The first protrusion 32a may have a fifth surface 32ay opposite the third surface 32ax. The second protrusion 32b has a fourth surface 32bx facing the first protrusion 32a. The second protrusion 32b may have a sixth surface 32by opposite the fourth 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 to 8 32a ~T 32d ) is not particularly limited, and may be 0.1 mm or more and 10 mm or less, or 0.2 mm or more and 3 mm or less. 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. 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.

[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 0.50 or less, or 0.05 or greater and 0.25 or less.

[0033] 2, 3, and 5 to 8, 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, if 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 the welded portion 34 on at least the long side of the base 31 facilitates further improving the strength of 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] 1.3.2.1 First protrusion The first protrusion 32a has a third surface 32ax facing the second protrusion 32b and a fifth 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 with the current collecting unit 20. As shown in FIG. 2, the fifth surface 32ay may be an adhesive surface with the exterior body 40. The third surface 32ax and the fifth surface 32ay of the first protrusion 32a may be flat, as shown in the figure, or may have irregularities. The planar shapes of the third surface 32ax and the fifth surface 32ay (meaning the planar shapes when the third surface and the fifth surface are projected) are not particularly limited. In particular, when the planar shapes of the third surface 32ax and the fifth surface 32ay are rectangular, 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.

[0038] 1.3.2.2 Second protrusion The second protrusion 32b has a fourth surface 32bx facing the first protrusion 32a and a sixth surface 32by opposite the fourth surface 32bx. As shown in FIG. 2, the fourth surface 32bx does not need to contact the current collecting unit 20. On the other hand, as shown in FIG. 2, the sixth surface 32by may be an adhesive surface for bonding to the exterior body 40. The fourth surface 32bx and the sixth surface 32by of the second protrusion 32b may be flat as shown in the figure, or may have irregularities. The planar shapes of the fourth surface 32bx and the sixth surface 32by (meaning the planar shapes when the fourth surface and the sixth surface are projected) are not particularly limited. In particular, when the planar shapes of the fourth surface 32bx and the sixth surface 32by are rectangular, 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.

[0039] 1.3.2.3 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 rectangular planar shapes, 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] 1.3.2.4 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] 1.3.3 Aperture As shown in Figures 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 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. This also facilitates ensuring the structural efficiency around the terminal and the strength of the terminal. Furthermore, by having the second protrusion 32b welded to the base 31 form the long side of the rectangle, the strength of the terminal 30 can be further improved.

[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 33The 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.

[0046] As shown in FIG. 6, the opening 33 has a width W 33 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.

[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] 1.3.4 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 relationship between the thickness T31 of the base 31 and the thickness T32a of the first protrusion 32a and the thickness T32b of the second protrusion 32b is not particularly limited. In particular, when the base 31 is thicker than the first protrusion 32a and the second protrusion 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. 32cand 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 second protrusion 32b is welded to the base 31 of the terminal 30. When a portion of the protrusion 32 is welded to the base 31 in this manner, the design freedom for the space for connecting the current collecting part 20 in the terminal 30 is increased. Furthermore, the current collecting part 20 can be easily connected to the terminal 30, for example, by connecting the current collecting part 20 to the base 31 and / or the first protrusion 32a and then welding the second protrusion 32b to form a lid. Furthermore, by welding a portion of the protrusion 32 to the base 31, a weld 34 is formed in the terminal 30, and the strength of the terminal 30 may be improved by the weld 34. In the illustrated embodiment, only the second protrusion 32b of the protrusion 32 is welded, but the configuration of the terminal 30 is not limited to this. For example, one or both of the third protrusion 32c and the fourth protrusion 32d may be welded to at least one of the base 31, the first protrusion 32a, and the second protrusion 32b. In this way, even when one or both of the third protrusion 32c and the fourth protrusion 32d are welded, the above-mentioned effects can be expected.

[0051] The terminal 30 including the base 31 and the protrusion 32 (and the opening 33) can be manufactured, for example, by press-forming a metal to obtain a first metal member including the base 31 and the first protrusion 32a, etc., and then welding a second metal member that will become the second protrusion 32b to the first metal member. For example, pressure may be applied to one surface of a first metal member having a predetermined shape (e.g., a rectangular parallelepiped) to form irregularities, thereby forming the base 31, the first protrusion 32a, the third protrusion 32c, and the fourth protrusion 32d, and then a second metal member having a predetermined shape (e.g., a plate shape) may be welded to the first metal member to form the second protrusion 32b. Alternatively, the terminal 30 may be formed by welding a second metal member corresponding to the second protrusion 32b, a third metal member corresponding to the third protrusion 32c, and a fourth metal member corresponding to the fourth protrusion 32d to a first metal member on which the base 31 and the first protrusion 32a have been formed by press-forming or the like.

[0052] 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.

[0053] 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 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.

[0054] 1.4 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.

[0055] 1.4.1 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.

[0056] 1.4.2 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.

[0057] 1.4.3 Joint form between current collector and terminal As described above, the current collecting portion 20 is connected to the terminal 30. For example, the current collecting portion 20 may be bonded to the first surface 31x and / or the third surface 32ax of the terminal 30 to form the joint 25. In one embodiment, the current collecting portion 20 may be ultrasonically or laser bonded to one or both of the first surface 31x and the third surface 32ax.

[0058] 1.5 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.

[0059] 1.5.1 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 first protrusion 32a may have a fifth surface 32ay opposite to the third surface 32ax, and the second protrusion 32b may have a sixth surface 32by opposite to the fourth surface 32bx. 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 fifth surface 32ay of the first protrusion 32a and the sixth surface 32by of the second protrusion 32b.

[0060] 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.

[0061] As shown in FIG. 11, 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. 32The 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 35 may be disposed between the outer surface of the protrusion 32 and the exterior body 40.

[0062] 1.5.2 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.

[0063] 1.6 Application 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, the battery 100 having an electrode stack 10, a current collector 20, and a terminal 30, the electrode stack 10 being electrically connected to the terminal 30 via the current collector 20, the terminal 30 having a base 31 and a protruding portion 32, the base 31 having 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 being connected to the first protruding portion 32. a and a second protrusion 32b, the first protrusion 32a has a third surface 32ax facing the second protrusion 32b and a fifth surface 32ay opposite the third surface 32ax, the second protrusion 32b has a fourth surface 32bx facing the first protrusion 32a and a sixth surface 32by opposite the fourth surface 32bx, the current collecting portion 20 is in contact with one or both of the first surface 31x and the third surface 32ax, and the second protrusion 32b is welded to the base 31.

[0064] 2. Battery manufacturing method The battery 100 can be manufactured, for example, as follows. That is, as shown in FIG. 12 , the manufacturing method of the battery 100 may include connecting the current collecting portion 20 to a first metal member 30a and welding a second metal member 30b to the first metal member 30a to which the current collecting portion 20 is connected. In this case, the base 31 and the first protrusion 32a of the terminal 30 may be formed by the first metal member 30a, and the second protrusion 32b of the terminal 30 may be formed by the second metal member 30b. In this way, by connecting the current collecting portion 20 to the first metal member 30a and then welding the second metal member 30b, the connectivity of the current collecting portion 20 to the terminal 30 is improved. As shown in Figure 12, after welding the second metal member 30b, the electrode stack 10 and the current collecting portion 20 can be housed inside the outer casing 40, while a portion of the terminal 30 (second surface 31y) is exposed to the outside of the outer casing 40.

[0065] The electrode stack 10 and the current collecting part 20 can be produced by a known method. A known connection method may be used to connect the current collecting part 20 to the first metal member 30a. For example, ultrasonic bonding or laser bonding, as described above, may be used. The welding method for the first metal member 30a to the second metal member 30b is not particularly limited. Any appropriate welding method capable of joining the metal members together may be selected. The method for enclosing and sealing the electrode stack 10 in the exterior body 40 is not particularly limited. As described above, a known method, such as heat sealing the laminate exterior body, may be used. [Explanation of symbols]

[0066] 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 5th page 32b Second protrusion 32bx 4th 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 Welded section 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 protrusion has a third surface facing the second protrusion, the second protrusion has a fourth surface facing the first protrusion, the current collecting portion is in contact with one or both of the first surface and the third surface; The second protrusion is welded to the base. battery.

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

3. 10. The battery of claim 1, The protrusion has a third protrusion and a fourth protrusion. battery.

4. 4. The battery of claim 3, The base portion is thicker than the third protruding portion and the fourth protruding portion. battery.

5. 4. The battery of claim 3, one or both of the third protrusion and the fourth protrusion are welded to at least one of the base, the first protrusion, and the second protrusion; battery.

6. 4. The battery of claim 3, 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.

7. 4. The battery of claim 3, 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.

8. 8. The battery of claim 7, 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.

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

10. The battery according to any one of claims 1 to 9, The ratio of the width of the current collecting portion to the inner width of the base is 0.9 or more. battery.

11. The battery according to any one of claims 1 to 9, The thickness of the base portion is smaller than the protrusion length of the protrusion portion. battery.

12. The battery according to any one of claims 1 to 9, The thickness of the terminal is smaller than the thickness of the electrode laminate. battery.

13. The battery according to any one of claims 1 to 9, A bus bar is connected to the terminal. battery.

14. The battery according to any one of claims 1 to 9, The current collecting portion is ultrasonically bonded or laser bonded to one or both of the first surface and the third surface. battery.

15. The battery according to any one of claims 1 to 9, 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 9, the first protrusion has a fifth surface opposite to the third surface, the second protrusion has a sixth surface opposite to the fourth surface, the electrode stack and the current collecting portion are housed in a laminate exterior body, The laminate exterior body is adhered to the fifth surface and the sixth surface. battery.

17. A method for producing the battery according to any one of claims 1 to 9, comprising the steps of: connecting the current collecting portion to a first metal member; and welding a second metal member to the first metal member to which the current collecting portion is connected; Including, the base and the first protrusion of the terminal are formed by the first metal member; The second metal member constitutes the second protrusion of the terminal. How batteries are manufactured.

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