battery

Abstract

The main object of the present disclosure is to provide a battery with good joint of tab and current collecting terminal. The problem is solved in the present disclosure by providing a battery including an electricity generating element having a first active material layer, a second active material layer, an electrolyte layer disposed between the first active material layer and the second active material layer, a first current collector that collects electricity of the first active material layer, and a second current collector that collects electricity of the second active material layer, the first current collector having a first tab, the battery including a first current collecting terminal electrically connected to the first tab, the first current collecting terminal having a base portion and a protruding portion protruding toward the first tab from the base portion when viewed in a thickness direction of the electricity generating element, the first tab having a slit extending from an end portion T1 on the first current collecting terminal side toward the first active material layer, the slit and the protruding portion being in contact, and the first tab having a crimp portion including the slit.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a battery. BACKGROUND

[0002] A battery such as a lithium ion secondary battery generally has a positive electrode current collector, a positive electrode active material layer, an electrolyte layer, a negative electrode active material layer, and a negative electrode current collector. The positive electrode current collector generally has a positive electrode tab that is electrically connected to a positive electrode current terminal. On the other hand, the negative electrode current collector generally has a negative electrode tab that is electrically connected to a negative electrode current terminal. In Patent Literature 1, a joining method is disclosed in which a laminated structure in which a plurality of metal foils and a plurality of insulating films are laminated, and a metal plate provided at an end portion of the laminated structure are joined.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: Japanese Patent Application Publication No. 2011-129328 SUMMARY

[0006] Generally, since the thickness of the tab is thin, unintended deformation is likely to occur. If unintended deformation occurs, there is a possibility that the tab and the current terminal are joined poorly.

[0007] The present disclosure was achieved in view of the above-described actual circumstances, and a main object thereof is to provide a battery in which a tab and a current terminal are joined well.

[0008] In the present disclosure, a battery is provided, which is a battery provided with a power generating element having a first active material layer, a second active material layer, an electrolyte layer disposed between the first active material layer and the second active material layer, a first current collector that collects electricity of the first active material layer, and a second current collector that collects electricity of the second active material layer, the first current collector having a first tab, the battery being provided with a first current terminal that is electrically connected to the first tab, the first current terminal having a base portion and a protruding portion that protrudes toward the first tab side from the base portion when viewed in a thickness direction of the power generating element, the first tab having a slit that extends from an end portion T1 on the first current terminal side toward the first active material layer side, the slit and the protruding portion being in contact, the first tab having a buckling part that includes the slit.

[0009] According to the present disclosure, by providing a slit in the tab, and a buckling part that includes the slit, a battery in which a tab and a current terminal are joined well is obtained.

[0010] In the above disclosure, the end portion T of the first active material layer side of the slit can be located at a position further outward than the end portion T of the first active material layer. S In the above disclosure, the end portion T of the first active material layer side of the slit can be located at a position further outward than the end portion T of the first active material layer. F In the above disclosure, the end portion T of the first active material layer side of the slit can be located at a position further outward than the end portion T of the first active material layer.

[0011] In the above disclosure, the first current collecting terminal can have a plurality of the protrusions.

[0012] In the above disclosure, the first tab can have a plurality of the slits with respect to one of the protrusions.

[0013] In the above disclosure, the power generating element can be of a sheet shape.

[0014] The battery of the present disclosure achieves the effect of good joining of the tab and the current collecting terminal. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a schematic perspective view illustrating a battery in the present disclosure.

[0016] Figure 2 is a cross-sectional view of A-A in Figure 1

[0017] Figure 3 is a cross-sectional view of B-B in Figure 1

[0018] Figure 4 is a schematic plan view illustrating a first tab and a first current collecting terminal in the present disclosure.

[0019] Figure 5 is a schematic plan view and a schematic cross-sectional view illustrating a first tab in the present disclosure.

[0020] Figure 6 is a schematic plan view illustrating a first tab in the present disclosure.

[0021] Figure 7 is a schematic cross-sectional view illustrating a protrusion in the present disclosure.

[0022] Figure 8 is a schematic perspective view illustrating a first current collecting terminal in the present disclosure.

[0023] Figure 9 is a schematic perspective view illustrating a manufacturing method of a battery in the present disclosure.

[0024] Figure 10 is a schematic perspective view illustrating a manufacturing method of a battery in the present disclosure.

[0025] BRIEF DESCRIPTION OF DRAWINGS ​​

[0026] 1…1st active material layer

[0027] 2…2nd active material layer

[0028] 3…electrolyte layer

[0029] 4…1st current collector

[0030] 4t…1st tab

[0031] 5…2nd current collector

[0032] 5t…2nd tab

[0033] 10…power generating element

[0034] 20a…1st current collecting terminal

[0035] 20b…2nd current collecting terminal

[0036] 100…battery DETAILED DESCRIPTION

[0037] A battery in the present disclosure will be described in detail below using the drawings. Each of the drawings shown below is a diagram that is schematically shown, and the size, shape of each part is appropriately exaggerated for easy understanding. In addition, in the present specification, when expressing a manner in which another member is arranged with respect to a certain member, in a case where only "upper" or "lower" is noted, unless otherwise specified, both of the following are included: a case where another member is arranged in the directly upper or lower side in contact with a certain member, and a case where another member is arranged above or below a certain member with another member interposed.

[0038] Figure 1 is a schematic perspective view illustrating a battery in the present disclosure. Figure 2 is a cross-sectional view of A-A in Figure 1 , specifically, a cross-sectional view of a z-axis cross section of the power generating element viewed in the +x direction. Figure 3 is a cross-sectional view of B-B in Figure 1 , specifically, a cross-sectional view of an x-axis cross section of the 1st current collecting terminal viewed in the -z direction.

[0039] Figure 1 The battery 100 shown in Figure 2 has a plurality of power generating elements 10. As shown in Figure 2 , the power generating element 10 has a 1st active material layer 1, a 2nd active material layer 2, an electrolyte layer 3 arranged between the 1st active material layer 1 and the 2nd active material layer 2, a 1st current collector 4 that collects electricity of the 1st active material layer 1, and a 2nd current collector 5 that collects electricity of the 2nd active material layer 2. Figure 1The first collector 4 has a first tab 4t as shown.

[0040] Figure 1 The battery 100 shown has a first current collecting terminal 20a electrically connected to the first tab 4t. Further, in the Figure 1 embodiment, a state before the first tab 4t and the first current collecting terminal 20a are electrically connected is shown for convenience. As Figure 3 shown, the first current collecting terminal 20a has a base portion 21 and a protruding portion 22 protruding from the base portion 21 toward the first tab (not shown) side. Further, as Figure 4 shown in (a), the first tab 4t has a slit S extending from an end portion T1 on the first current collecting terminal 20a side toward the first active material layer 1 side. As Figure 4 shown in (b), the slit S and the protruding portion 22 are in contact, and the first tab 4t has a bent portion B including the slit S.

[0041] Figure 5 (a) is a schematic plan view illustrating the first tab in the present disclosure, showing the first tab before being electrically connected to the first current collecting terminal. Figure 5 (b) is Figure 5 an A-A cross-sectional view of (a). On the other hand, Figure 5 (c) is a schematic plan view illustrating the first tab in the present disclosure, showing the first tab after being electrically connected to the first current collecting terminal. Figure 5 (d) is Figure 5 an A-A cross-sectional view of (c). Figure 5 The first tab 4t shown in (a), (b) has two slits S, and an edge s1 between the two slits S is in contact with the protruding portion (not shown) and moves toward the first active material layer 1 side. As a result, as Figure 5 shown in (c), (d), a portion of the first tab 4t is bent in a manner that it is deformed out of the plane in the thickness direction D T and forms a bent portion B having the slit S.

[0042] According to the present disclosure, by providing a slit in the tab, and by providing a pressure-bent portion including the slit, a battery in which the tab and the current collector terminal are joined well is obtained. As described above, generally, since the tab is thin in thickness, unintended deformation is likely to occur. If unintended deformation occurs, there is a possibility that the tab and the current collector terminal are joined poorly. For example, when unintended deformation occurs at the root portion of the tab, there is a possibility that a short circuit occurs due to the deformed tab contacting a member of different polarity. In particular, in a case where the current collector terminal and the tab are joined by pressing the current collector terminal having a protruding portion against the tab, although the current collector terminal and the tab can be joined firmly, deformation of the tab is likely to occur due to the protruding portion. In the present disclosure, in view of this, a slit is provided in the tab. Thus, when the current collector terminal having the protruding portion is pressed against the tab, a pressure-bent portion including the slit is formed. By thus providing a slit in the tab, the position at which pressure-bending occurs is actively provided, and deformation of the tab can be controlled. As a result, a battery in which the tab and the current collector terminal are joined well is obtained.

[0043] 1. Power generating element

[0044] The power generating element in the present disclosure has a first active material layer, a second active material layer, an electrolyte layer disposed between the first active material layer and the second active material layer, a first current collector that collects electricity of the first active material layer, and a second current collector that collects electricity of the second active material layer.

[0045] In the present disclosure, in a case where the first active material layer is a positive electrode active material layer, the first current collector is a positive electrode current collector, the second active material layer is a negative electrode active material layer, and the second current collector is a negative electrode current collector. Conversely, in a case where the first active material layer is a negative electrode active material layer, the first current collector is a negative electrode current collector, the second active material layer is a positive electrode active material layer, and the second current collector is a positive electrode current collector.

[0046] (1) First current collector

[0047] The first current collector in the present disclosure is electrically connected to the first active material layer, and collects electricity of the first active material layer. The first current collector is disposed, for example, on the surface of the first active material layer on the side opposite to the electrolyte layer. Alternatively, as shown in Figure 4 The first tab 4t is disposed in a region in the thickness direction (z-axis direction) of the power generating element 10 that does not overlap with the first active material layer 1. For example, in a case where the first active material layer 1 is formed using a coating method, the first tab 4t is an uncoated portion in which the first active material layer is not formed.

[0048] As shown in Figure 4 The first tab 4t is disposed in a region in the thickness direction (z-axis direction) of the power generating element 10 that does not overlap with the first active material layer 1. For example, in a case where the first active material layer 1 is formed using a coating method, the first tab 4t is an uncoated portion in which the first active material layer is not formed. FExtending outwards, its direction of extension is denoted as D1. The direction of extension D1 is parallel to the thickness direction D of the power generation element 10. T cross. Figure 4 In (a), the extension direction D1 corresponds to the thickness direction D of the power generation element 10. T Orthogonal direction (z-axis direction) to (x-axis direction). The extension direction D1 of the first electrode 4t intersects the thickness direction D of the power generation element 10. T The angle (acute side) is, for example, 60° or more and 90° or less, or 75° or more and 90° or less, or 80° or more and 90° or less.

[0049] like Figure 4 As shown in (a), when viewed from above in the thickness direction (z-axis direction) of the power generation element 10, the first electrode 4t has a slit S extending from the end T1 on the first collector terminal side toward the first active material layer 1 side. The top view shape of the slit S can be straight or curved. Furthermore, the end of the slit S on the first active material layer 1 side is denoted as end T. S From end T1 to end T S The length is denoted as L S L S For example, it can be 0.1 mm or more, or 1 mm or more. On the other hand, L S For example, it can be less than 30mm, or less than 5mm.

[0050] In addition, such as Figure 4 As shown in (a), the preferred end T S Located at the end T F The outermost position. That is, preferably at the end T. S and end T F There exists a region without slit S. This is because it can suppress root deformation of the first electrode ear. From end T... S To end T F The length (shortest length) is denoted as L. SF L SF For example, it can be 0.1 mm or more, or 1 mm or more. On the other hand, L SF For example, it can be less than 30mm, or less than 5mm.

[0051] In addition, such as Figure 4 As shown in (b), the slit S and the protrusion 22 are in contact. Figure 4 (b) The first electrode tab 4t shown has two slits S relative to one protrusion 22. Thus, the first electrode tab 4t can also have multiple slits S relative to one protrusion 22. By forming multiple slits S relative to one protrusion 22, the bent portion can be stably formed. On the other hand, as... Figure 6(a) shown, the 1st tab 4t can also have only one slit S with respect to one protrusion 22. In this case, there is an advantage that the manufacturing process can be simplified.

[0052] As Figure 6 (a) shown, the extension direction of the slit S is denoted as D S . The angle (acute angle side) formed by the extension direction D S 1 (the extension direction of the 1st tab 4t) is, for example, 0° or more and 45° or less, and can be 0° or more and 30° or less. In addition, as Figure 6 (b) shown, the 1st tab 4t preferably has a plurality of slits S with respect to one protrusion 22, and the distance between adjacent slits S is preferably larger from the end portion T1 toward the end portion T S . This is because it becomes difficult to generate out-of-plane deformation of the buckling portion. On the other hand, as Figure 4 (a) shown, the 1st tab 4t can have a plurality of slits S with respect to one protrusion 22, and the distance between adjacent slits S can be the same from the end portion T1 toward the end portion T S . By "the same", it means that the difference between the maximum value and the minimum value of the distance between adjacent slits S in the interval from the end portion T1 to the end portion T S is 1 mm or less.

[0053] The 1st current collector in the present disclosure is a positive electrode current collector or a negative electrode current collector. As a material of the positive electrode current collector, for example, a metal such as aluminum, SUS (stainless steel), nickel, etc. can be listed. As a material of the negative electrode current collector, for example, a metal such as copper, SUS, nickel, etc. can be listed. As a shape of the 1st current collector, for example, a foil shape, a mesh shape, etc. can be listed. The thickness of the 1st current collector is, for example, 200 μm or less, and can be 20 μm or less. On the other hand, the thickness of the 1st current collector is, for example, 5 μm or more.

[0054] (2) 2nd Current Collector

[0055] The 2nd current collector in the present disclosure is electrically connected to the 2nd active material layer, and collects electricity of the 2nd active material layer. The 2nd current collector is, for example, disposed on the surface of the 2nd active material layer on the side opposite to the electrolyte layer. In addition, as Figure 1 shown, the 2nd current collector 5 can also have a 2nd tab 5t. The 2nd tab is usually disposed in a region that does not overlap with the 2nd active material layer in the thickness direction of the power generating element.

[0056] As Figure 1 shown, the 2nd tab 5t can also have a slit extending from the end portion T2 on the 2nd current collector terminal 20b side toward the 2nd active material layer (not shown). Regarding the preferred mode of the 2nd tab, since it is the same as the preferred mode of the 1st tab described above, the description thereof is omitted here. In addition, as Figure 1As shown, the second tab 5t and the first tab 4t can be arranged on opposite sides of the power generating element 10, respectively. Such a structure is called a double tab structure. On the other hand, although not particularly shown, the second tab and the first tab can also be arranged on the same side of the power generating element. Such a structure is called a single tab structure.

[0057] (3) First active material layer, second active material layer, and electrolyte layer

[0058] The first active material layer in the present disclosure is a positive electrode active material layer or a negative electrode active material layer. The second active material layer in the present disclosure has a polarity opposite to that of the first active material layer.

[0059] The positive electrode active material layer contains at least a positive electrode active material. The positive electrode active material layer can also contain at least one of a conductive material, an electrolyte, and a binder. As the positive electrode active material, for example, an oxide active material can be cited. As the oxide active material, for example, a rock salt layered-type active material such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2, a spinel-type active material such as LiMn2O4, an olivine-type active material such as LiFePO4. In addition, as the positive electrode active material, sulfur (S) can also be used. The shape of the positive electrode active material is, for example, a particle shape.

[0060] As the conductive material, for example, a carbon material can be cited. The electrolyte can be a solid electrolyte or a liquid electrolyte. The solid electrolyte can be an organic solid electrolyte such as a gel electrolyte, or an inorganic solid electrolyte such as an oxide solid electrolyte, a sulfide solid electrolyte. In addition, the liquid electrolyte (electrolytic solution) contains, for example, a supporting electrolyte such as LiPF6, and a solvent such as a carbonate-based solvent. In addition, as the binder, for example, a rubber-based binder, a fluorinated binder can be cited.

[0061] The negative electrode active material layer contains at least a negative electrode active material. The negative electrode active material layer can also contain at least one of a conductive material, an electrolyte, and a binder. As the negative electrode active material, for example, a metal active material such as Li, Si, a carbon active material such as graphite, an oxide active material such as Li4Ti5O 12 Li4Ti5O12, etc. can be cited. The shape of the negative electrode active material is, for example, a particle shape, a foil shape. As the conductive material, the electrolyte, and the binder, the same as the above-described content.

[0062] The electrolyte layer is arranged between the positive electrode active material layer and the negative electrode active material layer, and contains at least an electrolyte. The electrolyte can be a solid electrolyte or a liquid electrolyte. As the electrolyte, the same as the above-described content. The electrolyte layer can also have a separator.

[0063] (4) Power generating element

[0064] The power generating element in the present disclosure can be of a sheet type or a wound type. In the case of the sheet type, the tab is likely to be deformed unexpectedly in structure, but in the present disclosure, by providing a slit in the tab and a pressure bending portion, the tab is prevented from being deformed unexpectedly. On the other hand, in the case of the wound type, the first tab is wound in a spiral shape, and thus the rigidity of the first tab is high due to the circular arc portion of the spiral. In this regard, for example, in the case of a flat wound type power generating element (a power generating element obtained by flattening a wound type power generating element by pressing), deformation of the first tab is likely to occur in the flat portion thereof. In this regard, the flat wound type power generating element exhibits the effect of the present disclosure more than the wound type power generating element in which the first tab is wound in a spiral shape. It is preferable that the battery have a plurality of power generating elements. In addition, in the case where the battery has a plurality of power generating elements, the plurality of first tabs can be electrically connected to the first current collecting terminal without being joined to each other.

[0065] 2. Current collecting terminal

[0066] The battery in the present disclosure has a first current collecting terminal electrically connected to the first tab. In addition, the battery in the present disclosure has a second current collecting terminal electrically connected to the second tab. The material of these current collecting terminals is not particularly limited, and a metal such as SUS can be cited.

[0067] As shown in (a), in the case of viewing the power generating element 10 in the thickness direction (z-axis direction), the first current collecting terminal 20a has a base portion 21 and a protruding portion 22 protruding from the base portion 21 toward the first tab 4t side. As shown in (b), the protruding portion 22 and the first tab 4t are in contact. The base portion 21 and the first tab 4t can be in contact or not in contact, but the former is preferable. This is because the internal resistance is low. Figure 4 Figure 4 (b) shows, the protruding portion 22 and the first tab 4t are in contact. The base portion 21 and the first tab 4t can be in contact or not in contact, but the former is preferable. This is because the internal resistance is low.

[0068] The first current collecting terminal has at least a base portion and a protruding portion. The plan view shape (the outer edge shape in the case of viewing the base portion in the thickness direction) of the base portion is, for example, a rectangular shape such as a long rectangular shape or a square shape. On the other hand, the first current collecting terminal can have only one protruding portion or a plurality of protruding portions. In the case of the latter, it is preferable that the plurality of protruding portions be regularly arranged at a certain interval. In addition, the protruding portion has a shape protruding from the base portion toward the first tab side. In this regard, Figure 7 (b) is also a schematic cross-sectional view illustrating the first current collecting terminal. As shown in (b), the first current collecting terminal 20a has a base portion 21 and a protruding portion 22 protruding from the base portion 21 toward the first tab 4t side. The protruding portion 22 and the first tab 4t are in contact. The base portion 21 and the first tab 4t can be in contact or not in contact, but the former is preferable. This is because the internal resistance is low. Figure 3 (b) is also a schematic cross-sectional view illustrating the first current collecting terminal. As shown in (b), the first current collecting terminal 20a has a base portion 21 and a protruding portion 22 protruding from the base portion 21 toward the first tab 4t side. The protruding portion 22 and the first tab 4t are in contact. The base portion 21 and the first tab 4t can be in contact or not in contact, but the former is preferable. This is because the internal resistance is low. Figure 7 ​As shown in (a), the height of the protrusion 22 (the length to the base 21) is denoted as H, and the width of the protrusion 22 (the length in a direction orthogonal to the height H) is denoted as W. H is, for example, 0.1 mm or more, and can be 1 mm or more. On the other hand, H is, for example, 50 mm or less, and can be 30 mm or less. Similarly, W is, for example, 1 mm or more, and can be 5 mm or more. On the other hand, W is, for example, 50 mm or less, and can be 10 mm or less.

[0069] like Figure 7 As shown in (a), the top surface t of the protrusion 22 can be planar. The top surface t contacts the first electrode tab (not shown). The width of the top surface t relative to the aforementioned W is, for example, more than 0.5 times, more than 0.7 times, or more than 0.9 times. On the other hand, the width of the top surface t relative to the aforementioned W is, for example, less than 1 time. Furthermore, as... Figure 7 As shown in (b), the protrusion 22 can also be curved.

[0070] The first collector terminal may also have one or more walls arranged with sides sharing a common base. By providing walls, the rigidity of the first collector terminal is increased. Furthermore, by providing walls, even in the event of accidental deformation of the electrode tab, short circuits can be suppressed. For example... Figure 8 (a) The first collector terminal 20a shown has a wall portion 23 and a wall portion 24 arranged with a common base 21 along its long side. For example, the wall portion 24 forms the top surface of the first collector terminal 20a, and the wall portion 23 forms the bottom surface of the first collector terminal 20a. Moreover, Figure 8 (a) The first collector terminal 20a shown has a wall portion 25 and a wall portion 26 arranged such that they share a common base 21. For example, the wall portion 25 and the wall portion 26 respectively form the side surfaces of the first collector terminal 20a. On the other hand, as Figure 8 As shown in (b), the first collector terminal 20a may also have only a base 21 and a protrusion 22. Additionally, as... Figure 8 As shown in (c), the first collector terminal 20a may also have a groove portion 27 corresponding to the protrusion 22.

[0071] On the other hand, the second collector terminal may also have a base and a protrusion that protrudes towards the second tab side from the base, similar to the first collector terminal. Furthermore, the slit in the second tab and the protrusion in the second collector terminal can contact each other, and the second tab may have a bent portion including the aforementioned slit. Since the preferred embodiment of the second collector terminal is the same as the preferred embodiment of the first collector terminal described above, it will not be described here.

[0072] 3. Battery

[0073] The battery in the present disclosure can have an exterior body that houses a power generation element. As the exterior body, for example, a laminated-type exterior body, a case-type exterior body can be listed. In addition, the kind of the battery in the present disclosure is not particularly limited, and as a typical example, a lithium-ion secondary battery. Also, the use of the battery in the present disclosure is not particularly limited, and for example, a power source for a vehicle such as a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), a battery electric vehicle (BEV), a gasoline-fueled automobile, a diesel powered automobile, and the like can be listed. In particular, a power source for driving a hybrid electric vehicle or a battery electric vehicle is preferred. In addition, the battery in the present disclosure can also be used as a power source for a moving body other than a vehicle (for example, a railway vehicle, a ship, an airplane), and can also be used as a power source for an electronic product such as an information processing device.

[0074] The manufacturing method of the battery in the present disclosure is not particularly limited. Figure 9 and Figure 10 is a schematic perspective view illustrating a manufacturing method of the battery in the present disclosure. First, as shown in Figure 9 (a), a second active material layer 2 is formed on both surfaces of a second current collector 5. As a method of forming the second active material layer, for example, a method in which a slurry containing a material of the second active material layer is applied to the second current collector and dried can be listed. Next, as shown in Figure 9 (b), a slit S is formed in the second tab 5t. As a method of forming the slit S, for example, cutting using a blade, cutting using a laser can be listed. Next, as shown in Figure 9 (c), an electrolyte layer (not shown), a first active material layer (not shown), and a first current collector 4 are disposed on the two second active material layers 2, respectively, to obtain a laminate α. With respect to the slit S of the first tab 4t, the slit S can be formed in the first tab 4t in advance before the first current collector 4 is disposed, or the slit S can be formed in the first tab 4t after the first current collector 4 is disposed.

[0075] Thereafter, as shown in Figure 9 (d), the two laminates α are stacked in the thickness direction D T to manufacture a laminate β. Next, as shown in Figure 9(e) As shown, the first tab 4t formed with the slit S from the side of the laminated body β (the side of the power generating element) is pressed into the first current collecting terminal 20a, after which the laminated body β and the first current collecting terminal 20a are joined to produce the laminated body γ. As a method of joining the laminated body β and the first current collecting terminal 20a, there can be cited, for example, a method of welding using laser welding, electron beam welding, or the like, a method using a conductive paste, a method using solder (brazing material). Next, as shown in Figure 10 (a) As shown, the laminated body γ and the second current collecting terminal 20b are joined in the same manner as the first current collecting terminal 20a, to produce the laminated body δ. Also, the laminated body δ is housed in the exterior body 30. Next, as shown in Figure 10 (b) As shown, the space between the first current collecting terminal 20a and the exterior body 30 is sealed, and likewise the space between the second current collecting terminal 20b and the exterior body 30 is sealed. As a sealing method, there can be cited, for example, a calking treatment, a laminating treatment. This is done to obtain the battery 100.

[0076] The present disclosure is not limited to the above-described embodiments. The above-described embodiments are examples, and technical solutions having substantially the same configuration as the technical ideas recited in the claims in the present disclosure and achieving the same effects, regardless of what the technical solutions are, are included within the technical scope of the present disclosure.

Claims

1. A battery, which is a battery provided with a power generating element, the power generating element has a first active material layer, a second active material layer, an electrolyte layer disposed between the first active material layer and the second active material layer, a first current collector that collects electricity of the first active material layer, and a second current collector that collects electricity of the second active material layer, the first current collector has a first tab, the battery is provided with a first current terminal that is electrically connected to the first tab, the first current terminal has a base portion and a protruding portion that protrudes from the base portion toward the first tab in a plan view in a thickness direction of the power generating element, the first tab has a slit that extends from an end portion T1 on the first current terminal side toward the first active material layer side, the slit and the protruding portion are in contact, the first tab has a crimped portion that includes the slit, in a case where the first current terminal and the first tab are joined by pressing the first current terminal having the protruding portion toward the first tab, a part of the first tab is crimped in a manner that it is deformed out of plane in a thickness direction thereof, and the crimped portion having the slit is formed.

2. The battery according to claim 1, In the case of plan view in the thickness direction of the power generating element, the end portion T of the first active material layer side of the slit S is located at a position farther than the end portion T of the first active material layer F to the outer side.

3. The battery according to claim 1 or 2, the first current terminal has a plurality of the protruding portions.

4. The battery according to claim 1 or 2, the first tab has a plurality of the slits with respect to one of the protruding portions.

5. The battery according to claim 1 or 2, the power generating element is a sheet type.

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