battery

Abstract

As a problem, the main object of the present disclosure is to provide a battery in which a tab and a current collecting terminal are joined well. In the present disclosure, the problem is solved by providing a battery that is a battery provided with a plurality of power generating elements 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 including at least a root portion, a plurality of the first tabs being disposed in a superimposed manner in a thickness direction of the power generating element, the battery being provided with a first current collecting terminal electrically connected to the plurality of the first tabs, and a resin layer that reinforces the root portion being disposed between adjacent first tabs among the plurality of power generating elements.

Description

Technical Field

[0001] This disclosure relates to batteries. Background Technology

[0002] Batteries such as lithium-ion rechargeable batteries typically include a power generating element, which has a positive electrode, a negative electrode, and an electrolyte layer disposed between the positive and negative electrodes. Patent Document 1 discloses a sealed battery in which at least one of the positive and negative electrodes has a curved part, and the curved part is in contact with the current collector surface.

[0003] Prior art literature

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2002-170547 Summary of the Invention

[0006] The positive electrode typically has a positive active material layer and a positive current collector. The negative electrode typically has a negative active material layer and a negative current collector. These current collectors have tabs for electrical connection with the current collector terminal. Generally, the tabs are thin, making them prone to unintentional deformation. If the tabs deform, the connection between the tabs and the current collector terminal may become insufficient.

[0007] This disclosure was made in view of the above facts, and its main purpose is to provide a battery with good engagement between the tabs and the current collector terminals.

[0008] In this disclosure, a battery is provided that has a plurality of power generation elements. The power generation elements have 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 for collecting current in the first active material layer, and a second current collector for collecting current in the second active material layer. The first current collector has a first tab that includes at least a root part. In the thickness direction of the power generation elements, a plurality of the first tabs are arranged in an overlapping manner. The battery has a first current collector terminal that is electrically connected to the plurality of the first tabs. In the plurality of power generation elements, a resin layer that reinforces the root part is disposed between adjacent first tabs.

[0009] According to this disclosure, by providing a resin layer at the base of the reinforcing tab, a battery with good bonding between the tab and the current collector terminal is achieved.

[0010] In the above disclosure, the first electrode may include a curved portion disposed at the top of the root and extending in a direction intersecting the extending direction of the root.

[0011] In the above disclosure, the angle formed between the extension direction of the curved portion and the thickness direction of the power generation element can be 0° or more and 30° or less.

[0012] In the above disclosure, the height of the first electrode is set as H. T Set the height of the above resin layer to H. R In the case of H above T And the above H R It can also satisfy 0.5≤H R / H T ≤1.

[0013] In the aforementioned disclosure, the aforementioned H T And the above H R It can also satisfy 0.5≤H R / H T ≤0.95.

[0014] In the above disclosure, the width of the first electrode tab is set to W. T Let the width of the above resin layer be W. R In the case of W above T And the above W R It can also satisfy 0.5≤W R / W T .

[0015] In the above disclosure, the center line of the first electrode in the width direction is set as L. C In the case of L mentioned above, it can be used in conjunction with the above L C The aforementioned resin layers exist in an overlapping manner.

[0016] In the above disclosure, the resin layer may contain at least one of a thermoplastic resin and a curable resin.

[0017] In the above disclosure, the resin layer may also contain an elastomeric resin.

[0018] The battery disclosed herein achieves a good connection between the tabs and the current collector terminals. Attached Figure Description

[0019] Figure 1 This is a schematic front view illustrating the battery in this disclosure.

[0020] Figure 2 yes Figure 1 The AA section diagram and the BB section diagram are shown in the figure.

[0021] Figure 3 This is a schematic cross-sectional view illustrating the method for forming the curved portion in this disclosure.

[0022] Figure 4 This is a schematic cross-sectional view illustrating the power generation elements in this disclosure.

[0023] Figure 5 This is a schematic cross-sectional view illustrating the power generation elements in this disclosure.

[0024] Figure 6 This is a schematic cross-sectional view illustrating the power generation elements in this disclosure.

[0025] Figure 7 This is a schematic front view illustrating the power generation elements in this disclosure.

[0026] Figure 8 This is a schematic cross-sectional view illustrating the method for forming power generation elements in this disclosure.

[0027] Explanation of reference numerals in the attached figures

[0028] 1…First active substance layer

[0029] 2…Second active substance layer

[0030] 3…Electrolyte layer

[0031] 4…First collector

[0032] 4t…First pole ear

[0033] 5…Second collector

[0034] 5t…Second pole ear

[0035] 6…resin layer

[0036] 10…Power generation elements

[0037] 20a…First collector terminal

[0038] 20b…Second collector terminal

[0039] 100… batteries Detailed Implementation

[0040] The following describes the battery in this disclosure in detail using the accompanying drawings. The figures shown below are schematic, and the size and shape of the parts are appropriately exaggerated for ease of understanding. Furthermore, in this specification, when describing the arrangement of other components relative to a component, the use of "above" or "below" includes, unless otherwise specified, both the case where other components are arranged directly above or below a component in contact with it, and the case where other components are arranged above or below a component, separated by another component.

[0041] Figure 1 This is a schematic front view illustrating the battery in this disclosure. Figure 2(a) is Figure 1 AA section diagram, Figure 2 (b) is Figure 1 The BB cross-section diagram in the image. Figure 2 As shown, the battery 100 includes multiple power generation elements 10. Each power generation element 10 includes a first active material layer 1, a second active material layer 2, an electrolyte layer 3 disposed between the first active material layer 1 and the second active material layer 2, a first current collector 4 for collecting electricity from the first active material layer 1, and a second current collector 5 for collecting electricity from the second active material layer 2.

[0042] like Figure 2 As shown in (a), the thickness direction of the power generation element 10 is set as D. T .exist Figure 2 In (a), the thickness direction D of power generation element 10 T Equivalent to the x-axis direction. Figure 2 The first current collector 4 shown in (a) has: in the thickness direction D with respect to the power generation element 10 T A root portion 41 extending in an intersecting direction, and a curved portion 42 disposed at the tip of the root portion 41 and extending in a direction intersecting the extending direction of the root portion 41. Figure 2 In (a), the root portion 41 extends in the z-axis direction, and the curved portion 42 extends in the x-axis direction. Furthermore, in the thickness direction D of the power generation element 10... T Above, multiple first electrodes 4t (especially the root 41) are arranged in an overlapping manner.

[0043] like Figure 1 and Figure 2 As shown in (a), the battery 100 has a first collector terminal 20a electrically connected to a plurality of first tabs 4t. Figure 1 and Figure 2 In (a), the bent portion 42 of the first tab 4t is in surface contact with the first collector terminal 20a. The bent portion 42 and the first collector terminal 20a are joined by, for example, laser welding. In addition, a resin layer 6 for reinforcing the root 41 is disposed between adjacent first tabs 4t.

[0044] According to this disclosure, by providing a resin layer at the base of the reinforcing tab, a battery with good adhesion between the tab and the current collector terminal is achieved. As mentioned above, since the tab is thin, unintentional deformation is easily generated. If the tab deforms, the adhesion between the tab and the current collector terminal may become insufficient. In contrast, in this disclosure, a resin layer is provided at the base of the reinforcing tab. Therefore, unintentional deformation can be suppressed, and the adhesion between the tab and the current collector terminal becomes good. As a result, the effect of reduced internal resistance and improved cycle characteristics can be obtained. In addition, by providing a resin layer at the base of the reinforcing tab, the components on the positive electrode side and the components on the negative electrode side become less likely to come into contact, and the occurrence of internal short circuits can be suppressed. In addition, by providing a resin layer at the base of the reinforcing tab, slippage of components constituting the power generation element can be suppressed. In addition, by providing a resin layer at the base of the reinforcing tab, positional displacement of components constituting the power generation element can be suppressed.

[0045] 1. Power generation elements

[0046] The power generation elements disclosed herein include a first active material layer, a second active material layer, an electrolyte layer disposed between the first and second active material layers, a first current collector for collecting electricity from the first active material layer, and a second current collector for collecting electricity from the second active material layer. Additionally, for example... Figure 2 The power generation elements 10a and 10b shown in (a) have a second current collector 5 and are connected in parallel.

[0047] In this disclosure, when 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, when 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.

[0048] (1) First collector

[0049] The first current collector in this disclosure is electrically connected to the first active material layer to perform current collection on the first active material layer. The first current collector is, for example, disposed on the side of the first active material layer opposite to the electrolyte layer. Additionally, as... Figure 1 As shown, the first current collector 4 has a first tab 4t. (As...) Figure 2 As shown in (a), the first electrode 4t is disposed in the thickness direction D of the power generation element 10. T The area that does not overlap with the first active material layer 1. For example, when the first active material layer 1 is formed by coating, the first tab 4t is the uncoated part where the first active material layer is not formed.

[0050] like Figure 2As shown in (a), the first electrode 4t includes a root 41. The root 41 extends from the thickness direction D of the power generation element 10. T The portion extending outward from the boundary B between the first active material layer 1 and the first current collector 4. Figure 2 In (a), the extension direction of the root 41 is parallel to the thickness direction D of the power generation element 10. T Orthogonal. The extension direction of the root 41 is perpendicular to the thickness direction D of the power generation element 10. T The angle formed (acute angle side) is, for example, 60° or more and 90° or less, 75° or more and 90° or less, 80° or more and 90° or less.

[0051] like Figure 2 As shown in (a), the first tab 4t may also include a curved portion 42 disposed at the top of the root 41 and extending in a direction intersecting the extending direction of the root 41. By making the curved portion 42 in the first tab 4t and the first collector terminal 20a face to face, the first tab 4t and the first collector terminal 20a can be more stably joined. The curved portion 42 is disposed at the top of the root 41. The top of the root 41 refers to the end on the opposite side of the aforementioned boundary B. Furthermore, it is preferable that the curved portion 42 and the root 41 are the same component and are formed continuously. In this case, the top of the root 41 corresponds to the bending point where the root 41 and the curved portion 42 intersect.

[0052] exist Figure 2 In (a), the extending direction of the curved portion 42 is parallel to the thickness direction D of the power generation element 10. T Parallel. The extension direction of the curved portion 42 is parallel to the thickness direction D of the power generation element 10. T The angle formed (acute angle side) is, for example, 0° or more and 30° or less, 0° or more and 15° or less, or 0° or more and 10° or less. In addition, the angle formed (acute angle side) between the extending direction of the curved portion 42 and the extending direction of the root portion 41 is, for example, 60° or more and 90° or less, 75° or more and 90° or less, or 80° or more and 90° or less.

[0053] The first electrode lug 4t, having a curved portion 42, is formed, for example, by the following method. That is, as follows: Figure 3 As shown in (a), the paired power generation elements 10 (10a, 10b) are to be positioned in the thickness direction D of the power generation element 10. T The stacked body 11 is obtained by stacking multiple pairs of layers. Figure 3 (a) The laminate 11 shown has a structure obtained by stacking three pairs of power generation elements 10 (10a, 10b). Furthermore, each first electrode 4t is positioned in the thickness direction D of the power generation element 10. T Extend in an orthogonal manner. Then, as... Figure 3As shown in (b), a comb-shaped member 61 is arranged between adjacent first tabs 4t. Furthermore, a fixing member 62 is arranged on one surface side of the laminate 11. In this state, a bending member 63 is used to straighten the first tabs 4t. Thus, as... Figure 3 As shown in (c), a curved portion 42 is formed between the comb-shaped member 61 and the bending member 63.

[0054] like Figure 4 As shown in (a), in adjacent first electrode tabs 4t, the curved portion 42 of one first electrode tab 4t can contact the other first electrode tab 4t. Furthermore, as described above... Figure 2 As shown in (a), in adjacent first electrode tabs 4t, the curved portion 42 in one first electrode tab 4t may not contact the other first electrode tab 4t. Additionally, as... Figure 4 As shown in (b), the first electrode ear 4t may also have a root 41 but not a curved portion 42.

[0055] like Figure 2 As shown in (a), in the thickness direction D of the power generation element 10 T Above, multiple first electrode 4ts are arranged in an overlapping manner. For example, in Figure 1 In this configuration, multiple first electrode tabs 4t are arranged in an overlapping manner in the front-to-back direction (x-axis direction not shown). Additionally, in the thickness direction D of the power generation element 10... T Above, multiple first electrodes 4t can partially overlap or completely overlap with each other.

[0056] The first current collector in this disclosure is either a positive current collector or a negative current collector. Examples of materials for the positive current collector include metals such as aluminum, SUS (stainless steel), and nickel. Examples of materials for the negative current collector include metals such as copper, SUS, and nickel. Examples of shapes for the first current collector include, for example, foil or mesh. The thickness of the first current collector is, for example, 30 μm or less, 15 μm or less, or 5 μm or less. On the other hand, the thickness of the first current collector is, for example, 1 μm or more.

[0057] (2) Resin layer

[0058] The resin layer in this disclosure is a layer disposed between adjacent first tabs in a plurality of power generation elements and reinforcing the root of the first tab. The resin layer contains one or more types of resin. The resin can be a thermoplastic resin, or a cured resin (cured product) such as a thermosetting resin or an ultraviolet-curing resin. When the resin layer contains at least one of a thermoplastic resin and a cured resin, it has the advantage of being able to firmly reinforce the root of the first tab. Alternatively, the resin can also be an elastomeric resin. Examples of elastomeric resins include, for example, rubber and thermoplastic elastomers. When the resin layer contains an elastomeric resin, it has the advantage of being able to suppress damage to the first tab even when the power generation element undergoes volume changes due to charging and discharging.

[0059] Examples of resins include polyolefin resins (e.g., polyethylene resin, polypropylene resin), polyurethane resin, polyimide resin, polyester resin, and silicone resin. Examples of rubbers include silicone rubber, fluororubber, epichlorohydrin rubber, acrylic rubber, ethylene acrylic rubber, polyurethane rubber, nitrile rubber, hydrogenated nitrile rubber, chloroprene rubber, EPDM (ethylene-propylene-diene rubber), ethylene rubber, propylene rubber, butyl rubber, butadiene rubber, styrene-butadiene rubber, natural rubber, polyisobutylene rubber, and isoprene rubber. Examples of thermoplastic elastomers include olefin-based thermoplastic elastomers, styrene-butadiene-based thermoplastic elastomers, polybutadiene-based thermoplastic elastomers, and styrene-isoprene-based thermoplastic elastomers.

[0060] The resin content in the resin layer is, for example, 50% by weight or more, 70% by weight or more, or 90% by weight or more. Alternatively, the resin layer may contain only resin. The Young's modulus of the resin layer is not particularly limited, but is, for example, 1 × 10⁻⁶. 4 Below MPa, it can be 1×10 3 Below MPa, it can be 1×10 2 Below 10 MPa, it can be below 10 MPa. When the Young's modulus of the resin layer is low, it usually becomes a resin layer with good elasticity.

[0061] like Figure 5 As shown, the height of the first electrode 4t is set as H. T Set the height of resin layer 6 to H.R H T and H R This refers to the thickness direction D of the power generation element 10. T The maximum length in the orthogonal direction (z-axis direction). Additionally, H... T and H R The reference point on the bottom side (lower side of the figure) is the location of the boundary B between the first active material layer 1 and the first current collector 4. H R Relative to H T The proportion (H) R / H T For example, H can be 0.1 or higher, 0.3 or higher, or 0.5 or higher. R / H T If it is too small, there is a possibility that the root of the first pole piece may not be sufficiently reinforced. On the other hand, H R / H T Preferably, it is 1 or less. If H R / H T If the value exceeds 1, a resin layer may sometimes exist between the first tab and the first collector terminal. In this case, there is a possibility of increased resistance due to the resin layer. Additionally, H... R / H T It can be below 0.95, or below 0.9. Additionally, H... T With H R The difference (H) T -H R For example, it can be less than 5mm, less than 3mm, or less than 1mm.

[0062] like Figure 6 As shown, in the thickness direction D of power generation element 10 T In this case, the height of the resin layer 6 located at at least one end of the laminate 11 (an assembly of multiple power generation elements 10) can be greater than the height of the resin layer 6 located at the center of the laminate 11. The center of the laminate 11 is defined as the midpoint of the straight line connecting the two ends of the laminate 11. For example, if the power generation element undergoes a volume change due to charging and discharging, its stress tends to concentrate at the end of the laminate 11. Therefore, by increasing the height of the resin layer 6 located at the end of the laminate 11, damage to the first electrode tab caused by volume change can be suppressed. The height of the resin layer 6 located at the end of the laminate 11 is defined as H1, and the height of the resin layer 6 located at the center of the laminate 11 is defined as H2. The ratio of H1 to H2 (H1 / H2) is, for example, 1.1 or more, 1.2 or more, or 1.5 or more. On the other hand, H1 / H2 is, for example, 2.0 or less.

[0063] like Figure 7 As shown, the width of the first electrode 4t is set as W. TSet the width of resin layer 6 to W. R W T and W R This refers to the maximum length in the direction orthogonal to the thickness direction of the power generation element (y-axis direction). Additionally, the width W of the first electrode tab 4t... T Strictly speaking, such as Figure 7 The figure shown shows the width of the protrusion of the first electrode lug 4t. In the case of a curved portion, the width W of the first electrode lug 4t is... T Alternatively, the width of the curved section can be used. W R Compared to W T The proportion (W) R / W T For example, W can be 0.1 or higher, 0.3 or higher, or 0.5 or higher. R / W T If it is too small, there is a possibility that the root of the first pole ear will not be sufficiently strengthened. On the other hand, W R / W T It can be less than 1 or greater than 1. In the latter case, W R / W T For example, below 1.5. In the former case, W R / W T It can be below 0.95, or below 0.9. Additionally, such as... Figure 7 As shown, the center line of the first pole lug 4t in the width direction (y-axis direction) is set as L. C Centerline L C It is a line parallel to the z-axis direction; strictly speaking, such as... Figure 7 As shown, this is the center line at the protrusion of the first electrode 4t. In this disclosure, it is preferable to use a line that is in conjunction with L. C The resin layer 6 exists in an overlapping manner.

[0064] The method for forming the resin layer is not particularly limited, but a method in which small nozzles are arranged between adjacent first tabs and resin is injected from these nozzles can be cited as an example. Depending on the type of resin injected, curing processes such as heating or UV irradiation can be performed.

[0065] (3) Second collector

[0066] The second current collector in this disclosure is electrically connected to the second active material layer to perform current collection on the second active material layer. For example, the second current collector is disposed on the side of the second active material layer opposite to the electrolyte layer. Additionally, as... Figure 1 As shown, the second current collector 5 can also have a second tab 5t. For example... Figure 2 As shown in (b), the second electrode 5t is positioned in the thickness direction D of the power generation element 10. T The region that does not overlap with the second active material layer 2.

[0067] like Figure 2 As shown in (b), the second electrode 5t may also include a root 51. Similarly, the second electrode 5t may also include a curved portion 52 disposed at the top of the root 51 and extending in a direction intersecting the extending direction of the root 51. Likewise, multiple second electrodes 5t may also be arranged in the thickness direction D of the power generation element 10. T The configuration is an overlapping arrangement. Details regarding the second electrode are the same as those for the first electrode described above, therefore, they are omitted here.

[0068] like Figure 1 As shown, the second electrode 5t and the first electrode 4t can be configured on the same side of the power generation element. This structure is called a monopole structure. On the other hand, although not specifically illustrated, the second electrode 5t and the first electrode 4t can also be configured on opposite sides of the power generation element. This structure is called a bipole structure.

[0069] (4) First active material layer, second active material layer and electrolyte layer

[0070] The first active material layer in this disclosure is either a positive electrode active material layer or a negative electrode active material layer. The second active material layer in this disclosure has the opposite polarity to the first active material layer.

[0071] The positive electrode active material layer contains at least a positive electrode active material. The positive electrode active material layer may also further contain at least one of a conductive material, an electrolyte, and a binder. Examples of positive electrode active materials include oxide active materials. Examples of oxide active materials include LiNi. 1 / 3 Co 1 / 3 Mn 1 / 3 Boulder-type active materials include rock salt layers such as O2, spinel-type active materials such as LiMn2O4, and olivine-type active materials such as LiFePO4. Sulfur (S) can also be used as a positive electrode active material. The shape of the positive electrode active material is, for example, particulate.

[0072] Examples of conductive materials include carbon materials. The electrolyte can be a solid electrolyte or a liquid electrolyte. Solid electrolytes can be organic solid electrolytes such as gel electrolytes, or inorganic solid electrolytes such as oxide solid electrolytes or sulfide solid electrolytes. Liquid electrolytes (electrolytes) contain a supporting electrolyte such as LiPF6 and a solvent such as a carbonate-based solvent. Additionally, examples of adhesives include rubber-based adhesives and fluoride-based adhesives.

[0073] The negative electrode active material layer contains at least a negative electrode active material. The negative electrode active material layer may also contain at least one of a conductive material, an electrolyte, and a binder. Examples of negative electrode active materials include metallic active materials such as Li and Si, carbon active materials such as graphite, and Li₄Ti₅O₅. 12 The active material is an oxide, etc. The negative electrode active material can be in the form of particles or foil. The same applies to conductive materials, electrolytes, and binders.

[0074] An electrolyte layer is disposed 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. The same applies to the electrolyte as described above. The electrolyte layer may also have a separator.

[0075] (5) Methods for forming power generation elements

[0076] The method of forming the power generation elements in this disclosure is not particularly limited. Figure 8 This is a schematic cross-sectional view illustrating the method for forming power generation elements in this disclosure. Figure 8 With the above Figure 2 (a) Similarly equivalent to Figure 1 The AA section diagram. First, as shown... Figure 8 As shown in (a), prepare the second collector 5. Next, as... Figure 8 As shown in (b), a second active material layer 2 is formed on both sides of the second current collector 5. As a method for forming the second active material layer, for example, a method of coating a slurry containing the second active material layer onto the second current collector and drying it.

[0077] Next, as Figure 8 As shown in (c), electrolyte layers 3 are formed on each of the two second active material layers 2. Examples of methods for forming the electrolyte layers include, for instance, transfer printing. In transfer printing, for example, a component with an electrolyte layer formed on a substrate is prepared, and the electrolyte layer and the second active material layer in the component are arranged facing each other, then pressed. Afterward, the substrate is peeled off, thereby transferring the electrolyte layer onto the second active material layer. Then, as... Figure 8 As shown in (d), a first active material layer 1 is formed on each of the two electrolyte layers 3. A transfer method can be used to form the first active material layer. The transfer method is the same as described above. Next, as... Figure 8 As shown in (e), a first current collector 4 with a first tab 4t is disposed on each of the two first active material layers 1. Thus, a pair of power generation elements 10 (10a, 10b) sharing a second current collector 5 are obtained.

[0078] Furthermore, although not specifically illustrated, in a pair of power generation elements 10 (10a, 10b), one power generation element 10a may have a first current collector 4 while the other power generation element 10b may not have a first current collector 4. For example, Figure 3 As shown in (a), the paired power generation elements 10 (10a, 10b) are positioned along the thickness direction D of the power generation element 10. T In the case of multiple stacked pairs, by discontinuously arranging two first collectors 4 (there is a total of 1 first collector 4), it is possible to improve the volumetric energy density.

[0079] 2. Battery

[0080] The battery of this disclosure includes a first collector terminal electrically connected to a plurality of first tabs. Additionally, the battery of this disclosure may also include a second collector terminal electrically connected to a plurality of second tabs. The first and second tabs are collectively referred to as tabs, and the first and second collector terminals are collectively referred to as collector terminals. The material of the collector terminals is not particularly limited, but metals such as SUS are examples. The tabs and collector terminals are joined. Methods for joining the tabs and collector terminals include, for example, welding methods such as laser welding and electron beam welding, methods using conductive paste, and methods using solder.

[0081] The battery disclosed herein may also have an external casing that houses multiple power generation elements. Examples of such external casings include case-type casings and laminate-type casings. Furthermore, the type of battery disclosed herein is not particularly limited, but a typical example is a lithium-ion secondary battery. Moreover, the application of the battery disclosed herein is not particularly limited, but examples include power sources for vehicles such as hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), battery electric vehicles (BEVs), gasoline vehicles, and diesel vehicles. It is particularly preferred for use as a power source for driving hybrid electric vehicles, plug-in hybrid electric vehicles, or electric vehicles. Additionally, the battery disclosed herein can also be used as a power source for mobile bodies other than vehicles (e.g., railway trains, ships, aircraft), and as a power source for electrical products such as information processing devices.

[0082] This disclosure is not limited to the embodiments described above. The embodiments described above are illustrative, and technical solutions having substantially the same structure and achieving the same effect as the technical concept described in the claims of this disclosure are included within the technical scope of this disclosure.

Claims

1. A type of battery that possesses multiple power generation elements. The power generation element comprises 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 for collecting electricity from the first active material layer, and a second current collector for collecting electricity from the second active material layer. The first current collector has a first tab that includes at least a root. In the thickness direction of the power generation element, a plurality of the first electrodes are arranged in an overlapping manner. The battery has a first current collector terminal that is electrically connected to the plurality of first electrodes. In the plurality of power generation elements, a resin layer reinforcing the root is disposed between adjacent first electrodes. In the thickness direction of the power generation element, the height H1 of the resin layer located at at least one end of the assembly of the plurality of power generation elements, i.e., the laminate, is greater than the height H2 of the resin layer located at the center of the laminate, and the ratio H1 / H2 of H1 to H2 is 1.1 or more and 2.0 or less.

2. The battery according to claim 1, The first electrode includes a curved portion disposed at the top of the root and extending in a direction intersecting the extending direction of the root.

3. The battery according to claim 2, The angle between the extension direction of the curved portion and the thickness direction of the power generation element is 0° or more and 30° or less.

4. The battery according to any one of claims 1 to 3, When the width of the first electrode is set to W T The width of the resin layer is set to W. R In the case of W T and the W R Satisfying 0.5≤W R / W T .

5. The battery according to any one of claims 1 to 3, Let the center line of the first electrode in the width direction be L. C In the case of, to be in conjunction with the L C The resin layers exist in an overlapping manner.

6. The battery according to any one of claims 1 to 3, The resin layer contains at least one of a thermoplastic resin and a curable resin.

7. The battery according to any one of claims 1 to 3, The resin layer contains an elastomeric resin.

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