battery

Abstract

A battery includes a power generation cell having a positive electrode layer, a separator layer, and a negative electrode layer, one of the positive electrode layer and the negative electrode layer having a larger area than the other, the power generation cell having a non-opposing region, a first through portion being provided in the non-opposing region, a pair of the power generation cells being stacked in a thickness direction via a first current collector having a second through portion corresponding to the first through portion, and two opposing separator layers in the pair of the power generation cells being fixed by a first fixing portion located at the first through portion and the second through portion.

Description

Technical Field

[0001] This disclosure relates to batteries. Background Technology

[0002] Batteries with multiple power generation units having a positive electrode layer, a separator, and a negative electrode layer stacked along the thickness direction are known. For example, Japanese Patent Application Publication No. 2020-170667 discloses a method for manufacturing a stacked battery, which includes: a first preparation step for preparing a first electrode plate; a second preparation step for preparing a second electrode plate; and a stacking step for stacking the first electrode plate and the second electrode plate in a stacking direction such that an insulator is provided between the first electrode plate and the second electrode plate, and the first electrode active material layer and the second electrode active material layer are opposite to each other, to form an electrode stack. In Japanese Patent Application Publication No. 2020-170667, a first cladding material layer is provided on the first electrode plate to suppress the positional misalignment of the first electrode plate and the second electrode plate. Summary of the Invention

[0003] As disclosed in Japanese Patent Application Publication No. 2020-170667, by setting a first cladding material layer, it is possible to suppress the positional displacement of the electrode body, but on the other hand, the energy density (energy density per unit volume) of the battery may sometimes decrease.

[0004] This disclosure is made in view of the above-mentioned actual situation, and its main purpose is to provide a battery that can suppress the positional displacement of the electrode body while suppressing the reduction of energy density.

[0005] In this disclosure, a battery is provided, the battery having a power generation unit having a positive electrode layer, a separator layer and a negative electrode layer, wherein, when viewed from above along the thickness direction, the area of ​​one of the positive electrode layer and the negative electrode layer is larger than the area of ​​the other, the power generation unit having a non-opposing region where the positive electrode layer and the negative electrode layer are not opposite each other, and a first through portion as a hole or notch is disposed in the non-opposing region, the battery having a stacked electrode body including at least a pair of the power generation units, the pair of the power generation units being stacked along the thickness direction with a first current collector having a second through portion corresponding to the first through portion, and in the pair of the power generation units, the two opposing separator layers are fixed by a first fixing portion located at the first through portion and the second through portion.

[0006] According to this disclosure, the two opposing partitions are fixed by the first fixing part located in the first through portion disposed in the non-opposing region, so that the positional displacement of the electrode body can be suppressed while suppressing the decrease in energy density.

[0007] In the above disclosure, the first fixing part may include a component that is different from the two opposing partitions.

[0008] In the above disclosure, the first fixing part may include a portion of at least one of the two opposing partitions.

[0009] In the above disclosure, the first fixing part may have a gap through which the electrolyte can pass.

[0010] In the above disclosure, the first fixing part may not have a gap through which the electrolyte can pass.

[0011] In the above disclosure, the aforementioned pair of power generation units can be connected in parallel.

[0012] In the above disclosure, the stacked electrode body may have a power generation structure that is a pair of power generation units connected in parallel. The pair of power generation structures are stacked along the thickness direction with the second current collector in between. In the pair of power generation structures, the two opposing layers are fixed by the second fixing part.

[0013] In the above disclosure, the aforementioned pair of power generation units can be connected in series.

[0014] In the above disclosure, the battery may have a laminated outer casing that seals the stacked electrode body, the stacked electrode body having an outer partition on the surface of the outer casing, and the outer partition being fixed to the partition in the power generation unit by a third fixing part.

[0015] The battery disclosed herein has the effect of suppressing the reduction of energy density while suppressing the positional displacement of the electrode body. Attached Figure Description

[0016] The features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which the same reference numerals denote the same elements, and wherein:

[0017] Figure 1 is a schematic top view and a schematic cross-sectional view illustrating a power generation unit in this disclosure.

[0018] Figure 2 This is a schematic cross-sectional view illustrating a pair of power generation units in this disclosure.

[0019] Figure 3 This is a schematic cross-sectional view illustrating a pair of power generation units in this disclosure.

[0020] Figure 4 is a schematic cross-sectional view illustrating a power generation unit in this disclosure.

[0021] Figure 5 is a schematic top view illustrating a power generation unit in this disclosure.

[0022] Figure 6 is a schematic cross-sectional view illustrating a pair of power generation units in this disclosure.

[0023] Figure 7 This is a schematic cross-sectional view illustrating the stacked electrode body in this disclosure.

[0024] Figure 8 This is a schematic cross-sectional view illustrating the stacked electrode body in this disclosure.

[0025] Figure 9 This is a schematic cross-sectional view illustrating the battery in this disclosure.

[0026] Figure 10 is a schematic cross-sectional view illustrating a method for manufacturing a stacked electrode body according to the present disclosure.

[0027] Figure 11 is a schematic cross-sectional view illustrating a method for manufacturing a stacked electrode body according to the present disclosure. Detailed Implementation

[0028] The battery in this disclosure will now be described in detail using the accompanying drawings. The drawings shown below are schematic; for ease of understanding, the size and shape of the parts have been appropriately exaggerated. Furthermore, in each drawing, shading indicating cross-sections of the components has been appropriately omitted.

[0029] Figure 1A This is a schematic top view illustrating a power generation unit in this disclosure. Figure 1B yes Figure 1A The IB-IB sectional view. Furthermore, in Figure 1A For convenience, the details of the interlayered sections have been omitted. For example... Figure 1B As shown, the power generation unit 10 is located along the thickness direction D T It sequentially comprises a positive electrode layer 1, a separator layer 3, and a negative electrode layer 2. Furthermore, the area of ​​the negative electrode layer 2 is larger than the area of ​​the positive electrode layer 1. By making the area of ​​the negative electrode layer 2 relatively larger than the area of ​​the positive electrode layer 1, dendrite precipitation can be suppressed. Additionally, as... Figure 1B As shown, the regions where the positive electrode layer 1 and the negative electrode layer 2 are opposite are designated as opposite regions P, and the regions where the positive electrode layer 1 and the negative electrode layer 2 are not opposite are designated as non-opposite regions Q. Figure 1A As shown in Figures B and C, a first through section 7, which serves as a hole, is disposed in the non-opposite region Q.

[0030] in addition, Figure 1C This is a schematic top view illustrating a power generation unit in this disclosure. Figure 1D yes Figure 1C ID-ID cross-sectional view. Furthermore, in Figure 1C For convenience, the details of the interlayered sections have been omitted. For example... Figure 1C As shown in Figures D and D, the first through section 7, which serves as a gap, can also be configured in the non-relative region Q.

[0031] The battery disclosed herein has at least one pair of power generation units. Figure 2This is a schematic cross-sectional view illustrating a pair of power generation units in this disclosure. (See attached image.) Figure 2 As shown, a pair of power generation units (power generation unit 10A and power generation unit 10B) are separated by the first current collector X along the thickness direction D. T Layering. In Figure 2 In this configuration, the negative electrode layer 2 in power generation unit 10A and the negative electrode layer 2 in power generation unit 10B are electrically connected via a negative current collector 5, which serves as the first current collector X. That is, power generation unit 10A and power generation unit 10B are connected in parallel. Furthermore, the first current collector X has a second through-section 8 at a position corresponding to the first through-section 7a in power generation unit 10A and the first through-section 7b in power generation unit 10B. The partition layer 3 in power generation unit 10A and the partition layer 3 in power generation unit 10B face each other across the first through-section 7a, the second through-section 8, and the first through-section 7b. A first fixing part 11 is disposed at the first through-section 7a, the second through-section 8, and the first through-section 7b, and the two opposing partition layers 3 are fixed by the first fixing part 11.

[0032] Figure 3 This is a schematic cross-sectional view illustrating a pair of power generation units in this disclosure. (See attached image.) Figure 3 As shown, a pair of power generation units (power generation unit 10A and power generation unit 10B) are separated by the first current collector X along the thickness direction D. T Layering. In Figure 3 In this configuration, the negative electrode layer 2 in power generation unit 10A and the positive electrode layer 1 in power generation unit 10B are electrically connected via a bipolar current collector 6, which serves as the first current collector X. That is, power generation unit 10A and power generation unit 10B are connected in series. Furthermore, the first current collector X has a second through-section 8 at a position corresponding to the first through-section 7 in power generation unit 10A. The partition layer 3 in power generation unit 10A and the partition layer 3 in power generation unit 10B face each other across the first through-section 7 and the second through-section 8. A first fixing part 11 is disposed at the first through-section 7 and the second through-section 8, and the two opposing partition layers 3 are fixed by the first fixing part 11.

[0033] According to this disclosure, two opposing separators are fixed by a first fixing part located in the first through-section of the non-opposing region, thus suppressing both the reduction in energy density and the positional displacement of the electrode body. While the positional displacement of the electrode body can be suppressed by providing a fusion material layer as described above, the energy density (energy density per unit volume) of the battery can sometimes decrease. To address this, in this disclosure, a first fixing part is provided in the first through-section of the non-opposing region. Therefore, the reduction in the energy density of the battery can be suppressed. Furthermore, since the two opposing separators are fixed using the first fixing part, the occurrence of electrode body positional displacement can be suppressed.

[0034] 1. Power generation unit

[0035] The power generation unit of this disclosure includes a positive electrode layer, a separator layer, and a negative electrode layer. Furthermore, the area of ​​one of the positive and negative electrode layers is larger than the area of ​​the other. That is, the area of ​​the positive electrode layer can be larger or smaller than the area of ​​the negative electrode layer. From the viewpoint of suppressing dendrite precipitation, it is preferable that the area of ​​the negative electrode layer is larger than the area of ​​the positive electrode layer. In addition, the area of ​​the larger layer is designated as S1, and the area of ​​the smaller layer is designated as S2. The ratio of S1 to S2 (S1 / S2) is, for example, 1.03 or more, or 1.05 or more. On the other hand, there is no particular upper limit to S1 / S2, but if the value of S1 / S2 is large, the energy density of the battery may sometimes decrease. Furthermore, the area of ​​the positive or negative electrode layer refers to the area of ​​the pattern defined by the outer edge of the positive or negative electrode layer.

[0036] There are no particular limitations on the top view shape of the positive electrode layer, the separator layer, and the negative electrode layer, but examples include squares, rectangles, circles, ellipses, etc.

[0037] The power generation unit has a non-opposing region where the positive and negative electrode layers do not face each other. As mentioned above, the positive and negative electrode layers have different areas, thus creating a non-opposing region where the positive and negative electrode layers do not face each other (overlap) when viewed from above along the thickness direction. A first through-hole or notch is disposed in the non-opposing region. For example, as... Figure 4A As shown in Figures C and C, when the width of the first through portion 7 is set to W, W can be, for example, 0.5 mm or more and 3 mm or less, or 1 mm or more and 2 mm or less. In addition, when the first through portion is a hole, its top view shape is not particularly limited, but examples include rectangles such as squares and rectangles, circles such as circles and ellipses.

[0038] like Figure 4A As shown, when the first through portion 7 is a hole, the first through portion 7 has an end T1 located on the inner side (the side closer to the center of gravity of the negative electrode layer 2) and an end T2 located on the outer side (the side farther from the center of gravity of the negative electrode layer 2). It can be as follows... Figure 4A As shown, when viewed from above along the thickness direction, the end T1 of the first through portion 7 is located further outward than the end T3 of the positive electrode layer 1. Alternatively, it can also be as follows... Figure 4B As shown, when viewed from above along the thickness direction, the end T1 of the first through-section 7 overlaps with the end T3 of the positive electrode layer 1. Alternatively, although not specifically illustrated, it is also possible that, when viewed from above along the thickness direction, the end of the first through-section is located inside the end of the positive electrode layer. In this disclosure, end T3 is the end of an electrode layer with a relatively small area. Figure 4A In case B, the area of ​​the positive electrode layer 1 is smaller than the area of ​​the negative electrode layer 2, so the end T3 is equivalent to the end of the positive electrode layer 1. On the other hand, when the area of ​​the positive electrode layer is larger than the area of ​​the negative electrode layer, the end T3 is equivalent to the end of the negative electrode layer.

[0039] In addition, such as Figure 4C As shown, when the first through portion 7 is a notch, the first through portion 7 has an end T1 and does not have Figure 4A End T2 of B. When the first through-section 7 is a notch, it has the advantage of being easy to configure the first through-section 7 even when the area of ​​the non-opposing region is small. Furthermore, Figure 4C When viewed from above along the thickness direction, the end T1 is located outside the end T3 of the positive electrode layer 1. However, when viewed from above along the thickness direction, the end T1 can overlap with the end T3 of the positive electrode layer 1, or it can be located inside the end T3 of the positive electrode layer 1.

[0040] In addition, such as Figure 1A As shown in ~D, the power generation unit 10 may also have multiple first through sections 7. In Figure 1A In ~D, a pair of first through sections 7 are arranged opposite each other with a gap between them and opposite regions P. On the other hand, Figures 5A to 5C This is a schematic top view illustrating the power generation unit in this disclosure; for convenience, details of the partitions have been omitted. Figure 5A As shown, the power generation unit 10 may also have only one first through portion 7. In this case, the first through portion 7 is preferably a hole. This is because, compared to a notch, positional displacement can be suppressed isotropically. On the other hand, if the first through portion is a notch, as... Figure 1C As shown, it is preferable that the pair of first through portions 7 are arranged opposite each other with a gap between them and opposite regions P. By arranging them opposite each other, isotropy against positional offset can be improved. Alternatively, it is also possible to... Figure 5B As shown, the first through section 7 is positioned at the corner of the negative electrode layer 2 (the layer with a relatively large area), or as... Figure 5C As shown, the first through section 7 is disposed at the corners and edges of the negative electrode layer 2 (the layer with a relatively large area).

[0041] The power generation unit of this disclosure has a positive electrode layer, a separator layer, and a negative electrode layer. The positive electrode layer contains at least a positive electrode active material. Examples of positive electrode active materials include, for example, oxide active materials. Examples of oxide active materials include, for example, LiNi. 1 / 3 Co 1 / 3 Mn 1 / 3 O2 and other rock salt layered active materials, LiMn2O4 and other spinel-type active materials, LiFePO4 and other olivine-type active materials. The positive electrode active material is, for example, granular. The negative electrode layer contains at least a negative electrode active material. Examples of negative electrode active materials include metallic active materials such as Li and Si, carbon active materials such as graphite, and Li4Ti5O4. 12 Oxide active materials. The negative electrode active material may be in the form of granules or foil.

[0042] The separator typically has voids through which the electrolyte can pass. Materials used for the separator include, for example, resins, glass, and ceramics. Examples of resins include olefin resins such as polyethylene (PE) and polypropylene (PP), fluorinated resins such as polyvinylidene fluoride (PVDF), cellulose resins, polyamide resins, and polyimide resins. Examples of separators include porous membranes containing the above resins, porous ceramic membranes, nonwoven fabrics containing the above resins, and glass fiber nonwoven fabrics. The electrolyte typically contains a supporting salt and a solvent. Examples of supporting salts include inorganic salts such as LiPF6 and LiBF4, and organic salts such as LiCF3SO3, LiN(CF3SO2)2, and LiN(C2F5SO2)2. Examples of solvents include cyclic carbonates such as ethylene carbonate (EC) and propylene carbonate (PC), and chain carbonates such as dimethyl carbonate (DMC), diethyl carbonate (DEC), and ethyl methyl carbonate (EMC).

[0043] 2. Stacked electrode body

[0044] The stacked electrode body in this disclosure includes at least one pair of power generation units. For example... Figure 2 As shown, a pair of power generation units (power generation unit 10A and power generation unit 10B) are separated by the first current collector X along the thickness direction D. T Stacked. Furthermore, the first current collector X has a second through-section 8 at a position corresponding to the first through-section 7a in power generation unit 10A and the first through-section 7b in power generation unit 10B. Along the thickness direction D... T Viewed from above, the second through portion 8 overlaps at least partially with the first through portion 7a. Similarly, along the thickness direction D... T When viewed from above, the second through portion 8 and the first through portion 7b overlap by at least a portion. Thus, when viewed from above along the thickness direction, the first through portion and the second through portion typically overlap by at least a portion.

[0045] Furthermore, the partition 3 in power generation unit 10A and the partition 3 in power generation unit 10B are opposite each other separated by the first through section 7a, the second through section 8, and the first through section 7b. The first fixing part 11 is arranged in the first through section 7a, the second through section 8, and the first through section 7b, and the two opposing partitions 3 are fixed by the first fixing part 11.

[0046] For example, resin can be used as the material for the first fixing part. Examples of such resins include thermoplastic resins, thermosetting resins, and UV-curable resins. Specific examples of such resins include olefin resins such as polyethylene (PE) and polypropylene (PP), fluorinated resins such as polyvinylidene fluoride, cellulose resins, polyamide resins, and polyimide resins. In particular, in this disclosure, the spacer and the first fixing part preferably contain an olefin resin. This is because the spacer is firmly fixed by the first fixing part.

[0047] The first fixing part may also include components different from the two opposing partitions. For example, in Figure 2 In this configuration, the first fixing part 11 is composed of a component different from the two opposing partitions 3. Alternatively, the first fixing part may also include a portion of at least one of the opposing partitions. For example, in... Figure 6A In this configuration, one of the two opposing partition layers 3 has a protrusion 3a that inserts into the first through-hole in the negative electrode layer 2 and the second through-hole in the negative electrode current collector 5. That is, the first fixing part 11 is formed by the protrusion 3a of the partition layer 3. On the other hand, in... Figure 6B In this configuration, both opposing partition layers 3 have protrusions 3a, which are respectively inserted into the first through-hole in the negative electrode layer 2 and the second through-hole in the negative electrode current collector 5. In this case, it also... Figure 6A Similarly, the first fixing part 11 is formed by the protrusion 3a of the partition 3. Furthermore, although not specifically illustrated, even in the case where the two opposing partitions do not have protrusions (for example, even in cases like...), Figure 2 As shown, if the two opposing partitions 3 have a flat shape, they can also be fixed to each other by directly joining them in a state of deformation in the thickness direction. In this case, it can also be said that the first fixing part includes a portion of at least one of the two opposing partitions.

[0048] The first fixing part may also have a gap for the electrolyte to pass through. Since the stacked electrode body has a structure with multiple power generation units stacked, electrolyte tends to accumulate at the bottom of the stacked electrode body over time. To address this, by making the first fixing part have a gap, the electrolyte accumulated at the bottom can diffuse throughout the stacked electrode body via capillary action. On the other hand, the first fixing part may not have a gap for the electrolyte to pass through. For example, to effectively suppress positional displacement of the electrode body, it is preferable to use a first fixing part without a gap to firmly fix the opposing layers.

[0049] like Figure 7 As shown, the stacked electrode body 15 can also have multiple power generation structures that are connected in parallel as a pair of power generation units. Specifically, Figure 7 The stacked electrode body 15 has a power generation structure 10α as a pair of power generation units (power generation unit 10A and power generation unit 10B) connected in parallel, and a power generation structure 10β as a pair of power generation units (power generation unit C and power generation unit D) connected in parallel.

[0050] Furthermore, a pair of power generation structures (power generation structure 10α and power generation structure 10β) are separated by the second current collector Y along the thickness direction D. T Layering. In Figure 7In the power generation structure 10α, the positive electrode layer 1 in the power generation unit 10B is electrically connected to the positive electrode layer 1 in the power generation unit 10C of the power generation structure 10β via a positive electrode current collector 4 serving as the second current collector Y. Furthermore, in a pair of power generation structures (power generation structure 10α and power generation structure 10β), the spacer layer 3 in the power generation unit 10B of the power generation structure 10α faces the spacer layer 3 in the power generation unit 10C of the power generation structure 10β. The two facing spacer layers 3 are fixed by a second fixing part 12. As a result, all the spacer layers 3 in the stacked electrode body 15 are fixed to each other by the first fixing part 11 and the second fixing part 12. Details regarding the second fixing part 12 are the same as those for the first fixing part 11 described above. Unlike the first fixing part 11, the second fixing part 12 is generally not located in the first through part and the second through part. The second fixing part 12 and the first fixing part 11 may also be configured such that at least a portion overlaps when viewed from above along the thickness direction.

[0051] like Figure 8 As shown, the stacked electrode body 15 can also have multiple power generation units connected in series. Specifically, in Figure 8 In the stacked electrode body 15, power generation units 10A, 10B, 10C, and 10D are along the thickness direction D. T The power generation units 10A to 10D are stacked and connected in series. In adjacent power generation units, two opposing partitions 3 are fixed by a first fixing part 11. As a result, all partitions 3 in the stacked electrode body 15 are fixed to each other by the first fixing part 11.

[0052] like Figure 9 As shown, the battery 100 may also have a laminated outer casing 20 that seals the stacked electrode body 15. Figure 9 In this configuration, the stacked electrode body 15 has an outer partition 31 on the surface of the outer casing side 20. The outer partition 31 and the partition 3 in the power generation unit 10 can also be fixed by a third fixing part 13. By providing the third fixing part 13, positional displacement of the electrode body can be effectively suppressed. Details regarding the third fixing part 13 are the same as those for the first fixing part 11 described above. The third fixing part 13 can be as follows... Figure 9 As shown, it can also be located outside the first and second through sections, or as shown in the diagram. Figure 8 The through section located between the first through section (the through section in the power generation unit 10D) and the electrode current collector (negative electrode current collector 5) as shown.

[0053] In addition, such as Figure 9As shown, the third fixing part 13 and the first fixing part 11 can also be configured such that at least a portion overlaps when viewed from above along the thickness direction. Furthermore, the outer casing 20 and the outer partition 31 can also be fused together at a position where they at least overlap with the third fixing part 13 when viewed from above along the thickness direction. Additionally, the outer casing 20 and the outer partition 31 can also be fused together over the entire surface of the outer partition 31.

[0054] The method for forming the stacked electrode body in this disclosure is not particularly limited. Figures 10A to 10E This is a schematic cross-sectional view illustrating a method for manufacturing a stacked electrode body according to the present disclosure. Specifically, it illustrates a method for manufacturing a stacked electrode body as shown in the diagram. Figure 2 A schematic cross-sectional view of a method for manufacturing a stacked electrode body of a pair of power generation units (power generation unit 10A and power generation unit 10B) connected in parallel as shown.

[0055] First, such as Figure 10A As shown, a negative electrode with a negative electrode layer 2 is prepared to be formed on both sides of the negative electrode current collector 5. Next, as... Figure 10B As shown, the negative electrode is punched or laser-processed to form the first through-hole 7a, the second through-hole 8, and the first through-hole 7b. Next, as... Figure 10C As shown, the first fixing part 11 is arranged in the first through part 7a, the second through part 8, and the first through part 7b. Next, as... Figure 10D As shown, spacers 3 are disposed on the surfaces of the two negative electrode layers 2. The two spacers 3 are then arranged such that they cover the first fixing part 11 when viewed from above along the thickness direction. Next, positive electrodes (positive electrode layer 1 and positive electrode current collector 4) are disposed on the surfaces of the two spacers 3. Here, in Figure 10D In this process, at any time after the two spacers 3 have been configured, the two spacers 3 are joined to the first fixing part 11. This results in the laminated electrode body 15. As a method for joining the two spacers 3 to the first fixing part 11, heat sealing is an example.

[0056] in addition, Figures 11A to 11E This is a schematic cross-sectional view illustrating a method for manufacturing a stacked electrode body according to the present disclosure. Specifically, it illustrates a method for manufacturing a stacked electrode body as shown in the diagram. Figure 3 A schematic cross-sectional view of a method for manufacturing a stacked electrode body of a pair of power generation units (power generation unit 10A and power generation unit 10B) connected in series as shown.

[0057] First, such as Figure 11A As shown, a bipolar electrode is prepared, comprising a bipolar current collector 6, a positive electrode layer 1 formed on one surface of the bipolar current collector 6, and a negative electrode layer 2 formed on the other surface of the bipolar current collector 6. Next, as... Figure 11B As shown, the bipolar electrodes are punched or laser-processed to form the first through-hole 7 and the second through-hole 8. Next, as... Figure 11C As shown, the first fixing part 11 is arranged in the first through part 7 and the second through part 8. Next, as... Figure 11D As shown, separators 3 are respectively disposed on the surfaces of the positive electrode layer 1 and the negative electrode layer 2. At this time, the two separators 3 are disposed such that they cover the first fixing part 11 when viewed from above along the thickness direction. Next, a positive electrode (positive electrode layer 1 and positive electrode current collector 4) is disposed on the surface of the separator 3 on the negative electrode layer 2 side, and a negative electrode (negative electrode layer 2 and negative electrode current collector 5) is disposed on the surface of the separator 3 on the positive electrode layer 1 side. Here, in Figure 11D At any time after the two partitions 3 have been configured, the two partitions 3 are joined to the first fixing part 11. Thus, the stacked electrode body 15 is obtained.

[0058] 3. Battery

[0059] The type of battery disclosed herein is not particularly limited, but is typically a lithium-ion secondary battery. Furthermore, the application of the battery disclosed herein is not particularly limited, but examples include power sources for vehicles such as hybrid electric vehicles (HEVs), battery electric vehicles (BEVs), gasoline vehicles, and diesel vehicles. It is particularly preferred for use as a power source for driving hybrid electric vehicles or electric vehicles. In addition, the battery disclosed herein can be used as a power source for mobile bodies other than vehicles (e.g., railways, ships, aircraft), and also as a power source for electrical products such as information processing devices.

[0060] This disclosure is not limited to the embodiments described above. The embodiments described above are illustrative, and any embodiments having substantially the same structure and achieving the same effect as those described in the claims of this disclosure are included within the technical scope of this disclosure.

Claims

1. A battery comprising a stacked electrode body including at least a pair of power generation units, wherein each power generation unit has a positive electrode layer, a separator layer, and a negative electrode layer sequentially along a thickness direction, the pair of power generation units being stacked along the thickness direction with a first current collector as a separation, the positive electrode layer containing a positive electrode active material, and the negative electrode layer containing a negative electrode active material. When viewed from above along the thickness direction, the area of ​​one of the positive electrode layer and the negative electrode layer is larger than the area of ​​the other. The power generation unit has a non-opposite region where the positive electrode layer and the negative electrode layer are not opposite each other. A first through-hole, which is a hole or notch, is disposed in the non-opposing region between the positive electrode layer and the negative electrode layer. The first current collector has a second through portion at a position corresponding to the first through portion. In the pair of power generation units, the two partitions are opposite each other, separated by the first through portion and the second through portion, and the two opposing partitions are fixed by a first fixing portion located in the first through portion and the second through portion. The first fixing part has a gap through which the electrolyte can pass.

2. The battery according to claim 1, The first fixing part includes a component that is different from the two opposing partitions.

3. The battery according to claim 1, The first fixing part includes a portion of at least one of the two opposing partitions.

4. The battery according to any one of claims 1 to 3, The pair of power generation units are connected in parallel.

5. The battery according to claim 4, The stacked electrode body has a power generation structure that serves as the pair of power generation units connected in parallel. The pair of power generation structures are stacked along the thickness direction with the second current collector as a separation. In the pair of power generation structures, the two opposing partitions are fixed by a second fixing part.

6. The battery according to any one of claims 1 to 3, The pair of power generation units are connected in series.

7. The battery according to any one of claims 1 to 3, The battery has a laminated outer casing that seals the stacked electrode body. The stacked electrode body has an outer partition layer on the surface of the outer casing side. The outer partition is fixed to the partition in the power generation unit by the third fixing part.

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