Battery

Abstract

To provide a battery with excellent structure reliability.SOLUTION: A battery includes a multilayer body including a battery cell and an intermediate member disposed on each of both surfaces of the battery cell in a thickness direction. The battery cell comprises: an electrode laminating part where multiple electrodes are laminated in the thickness direction; and a sealing part disposed so as to cover an outer edge of the electrode laminating part. The intermediate member includes a current collector plate part and an elastic body part. When the battery is viewed planarly from the thickness direction, an area of the current collector plate part is smaller than an area of the battery cell. The current collector plate part includes a notch part. The elastic body part is disposed in the notch part. The elastic body part overlaps with the sealing part.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a battery.

Background Art

[0002] A battery generally includes a laminate having a negative electrode current collector, a negative electrode active material layer, a separator layer, a positive electrode active material layer, and a positive electrode current collector.

[0003] For example, Patent Document 1 discloses a battery pack having a single cell configured by laminating a positive electrode current collector layer, a positive electrode layer (positive electrode active material layer), a separator, a negative electrode layer (negative electrode active material layer), and a negative electrode current collector layer in this order, and a seal portion for sealing the outer peripheral portion of the single cell. Further, Patent Document 2 discloses a battery having a pressure absorption structure characterized in that a part or all of at least one of the battery constituent members such as a current collector, a battery cell, and a separator is a pressure absorption member having a property of absorbing pressure.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In a battery, it is assumed that a battery cell having an electrode stack portion in which a plurality of electrodes are stacked in the thickness direction and a seal portion disposed at the outer edge of the electrode stack portion is used. Also, in order to collect the electricity of the battery cell, it is assumed that current collector plates are disposed on both surfaces of the battery cell in the thickness direction. Here, due to the charge and discharge state of the battery and the change over time, the electrode stack portion may expand, and a difference may occur between the thickness of the electrode stack portion and the thickness of the seal portion. Although it will be described in detail later, if a difference occurs between the thickness of the electrode stack portion and the thickness of the seal portion, there is a risk that the current collector plate may be damaged or the outer edge of the electrode stack portion sealed by the seal portion may be damaged. Therefore, there is room for improving the structural reliability of the battery.

[0006] The present disclosure has been made in view of the above circumstances, and the main object thereof is to provide a battery having good structural reliability.

Means for Solving the Problems

[0007] [1] A battery comprising a laminate having a battery cell and intermediate members respectively disposed on both surfaces of the battery cell in the thickness direction, wherein the battery cell has an electrode stack portion in which a plurality of electrodes are stacked in the thickness direction and a seal portion disposed so as to cover the outer edge of the electrode stack portion, the intermediate member has a current collector plate portion and an elastic body portion, when the battery is viewed in plan from the thickness direction, the area of the current collector plate portion is smaller than the area of the battery cell, the current collector plate portion has a notch portion, the elastic body portion is disposed in the notch portion, and the elastic body portion overlaps with the seal portion.

[0008] [2] A battery comprising a laminate having a battery cell and intermediate members respectively disposed on both surfaces of the battery cell in the thickness direction, wherein the battery cell has an electrode laminate portion in which a plurality of electrodes are laminated in the thickness direction and a seal portion disposed so as to cover the outer edge of the electrode laminate portion, the intermediate member has a current collector plate portion and an elastic body portion, when the battery is viewed in plan from the thickness direction, the area of the current collector plate portion is smaller than the area of the battery cell, the elastic body portion is disposed outside the outer edge of the current collector plate portion, and the elastic body portion overlaps with the seal portion.

[0009] [3] The battery according to [2], wherein the elastic body portion is disposed outside the entire circumference of the outer edge of the current collector plate portion.

[0010] [4] The battery according to any one of [1] to [3], wherein when the intermediate member located at the first end portion of the battery, which is the lower side in the gravitational direction, is defined as the first intermediate member and the intermediate member located at the second end portion of the battery, which is the upper side in the gravitational direction, is defined as the second intermediate member, the rigidity of the elastic body portion in the first intermediate member is greater than the rigidity of the elastic body portion in the second intermediate member.

[0011] [5] The battery according to any one of [1] to [4], wherein the battery includes a plurality of the laminates laminated in the thickness direction. [Effect of the Invention]

[0012] In the present disclosure, there is an effect that a battery with good structural reliability can be provided. [Brief Description of the Drawings]

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Mode for Carrying Out the Invention

[0014] Hereinafter, embodiments in the present disclosure will be described in detail with reference to the drawings. Each of the drawings shown below is schematically illustrated, and the size and shape of each part are exaggerated as appropriate for easy understanding. Also, in this specification, when expressing the manner of arranging one member with respect to another member, when simply described as "above" or "below", unless otherwise specified, it includes both the case where another member is arranged directly above or directly below so as to be in contact with a certain member, and the case where another member is arranged above or below a certain member via another member.

[0015] FIG. 1 is a schematic cross-sectional view illustrating a battery in the present disclosure. The battery 100 shown in FIG. 1 includes a laminate L (L1 to L4) having a battery cell 10 and intermediate members 20 respectively arranged on both surfaces of the battery cell 10 in the thickness direction z. Although details will be described later, the battery cell 10 has an electrode laminate portion 5 in which a plurality of electrodes are laminated in the thickness direction z, and a seal portion 6 arranged at the outer edge of the electrode laminate portion 5. The intermediate member 20 has a current collector plate portion 21 and an elastic body portion 22. Further, when the battery 100 is viewed in plan from the thickness direction z, the area of the current collector plate portion 21 is smaller than the area of the battery cell 10. The elastic body portion 22 overlaps the seal portion 6. Although details will be described later, in the above intermediate member, the current collector plate portion may have a notch portion, and the elastic body portion may be arranged in the notch portion. Also, in the above intermediate member, the elastic body portion may be arranged outside the outer edge of the current collector plate portion.

[0016] According to the present disclosure, in the thickness direction, predetermined intermediate members are respectively disposed on both surfaces of the battery cell, and since the elastic body portions of the intermediate members overlap the seal portions of the battery cell, a battery with good structural reliability is obtained.

[0017] With reference to FIG. 2, the reasons for problems occurring in the present disclosure and the mechanisms for solving the problems will be described. FIGS. 2(a) and (b) are diagrams for explaining the reasons for problems occurring in the present disclosure, and FIGS. 2(c) and (d) are diagrams for explaining the mechanisms for solving the problems in the present disclosure.

[0018] The battery 200 shown in FIG. 2(a) includes a battery cell 110 having an electrode laminate 105 and a seal portion 106, and intermediate members (current collectors) 120 respectively disposed on both surfaces of the battery cell 110 in the thickness direction z. Further, in the battery 200, a buffer member 130 for absorbing the expansion of the battery cell is disposed at one end portion in the thickness direction z. These members are housed in an exterior body 140. As shown in FIG. 2(b), in such a battery, the positive electrode active material layer and the negative electrode active material layer in the electrode laminate expand due to the charge / discharge state and changes over time, and the electrode laminate may also expand. Basically, the seal portion that seals the end portion of the electrode laminate does not expand or has an extremely small expansion amount, so there is a possibility that a difference in thickness may occur between the electrode laminate and the seal portion. In that case, a gap may occur between the current collector and the seal portion. When vibration in the thickness direction is applied to the battery in a state where such a gap has occurred, the seal portion may vibrate independently. When the seal portion vibrates independently, the seal portion and the current collector may come into contact with each other, and the current collector may be damaged, or the outer edge of the electrode laminate sealed by the seal portion may be damaged. Although not particularly shown, in the electrode laminate, when a difference occurs between the thickness of the active material layer (positive electrode active material layer and negative electrode active material layer) and the thickness of the seal portion that seals the end portion of the active material layer due to the expansion of the active material layer, similarly, the seal portion may vibrate independently, and the current collector of the electrode laminate may be damaged.

[0019] In contrast, as shown in FIG. 2(c), in the present disclosure, the intermediate members 20 disposed on both surfaces of the battery cell 10 each have a current collector plate portion 21 smaller than the area of the battery cell 10 and an elastic body portion 22 disposed at a predetermined position of the current collector plate portion 21. Further, in the thickness direction z, the elastic body portion 22 overlaps with the seal portion 6. In such a battery, when the electrode laminate 5 expands and a difference in thickness occurs with the seal portion 6, the compressive force (load) applied to the elastic body portion 22 decreases, and the elastic body portion 22 deforms so as to return to the length (free length) in the unloaded state. As shown in FIG. 2(d), it is possible to suppress the occurrence of a gap in which the elastic body portion 22 can support the seal portion 6. As a result, it is possible to suppress the seal portion from vibrating independently, and the structural reliability of the battery is improved. In the battery 200 shown in FIGS. 2(a) and 2(b), by increasing the thickness of the intermediate member (current collector plate 120), it is considered possible to improve the durability of the current collector plate and suppress breakage of the current collector plate. However, it is difficult to suppress breakage of the outer edge of the electrode laminate sealed by the seal portion. Further, when the current collector plate is thickened, the electrical resistance increases. The same applies to the current collector inside the electrode laminate. On the other hand, according to the present disclosure, since breakage of the current collector plate can be suppressed without increasing the thickness of the current collector plate, there is also an advantage that the structural reliability of the battery can be improved while avoiding an increase in electrical resistance.

[0020] 1. Laminated body The laminated body in the present disclosure has a battery cell and an intermediate member. (1) Battery cell FIG. 3 is a schematic plan view and a schematic cross-sectional view illustrating a battery cell in the present disclosure. FIG. 3(a) is a schematic plan view of the battery cell viewed from the thickness direction, and FIG. 3(b) is a cross-sectional view taken along line A-A of FIG. 3(a).

[0021] As shown in FIGS. 3(a) and 3(b), the battery cell 10 has an electrode stacking portion 5 in which a plurality of electrodes E are stacked in the thickness direction z, and a seal portion disposed so as to cover the outer edge of the electrode stacking portion 5. As shown in FIG. 3(a), the "outer edge of the electrode stacking portion" refers to the outer edge of the current collector constituting the electrode stacking portion. In FIG. 3(a), a seal portion 6 is disposed so as to cover the outer edge E1 of the electrode stacking portion 5. The seal portion 6 has an outer edge E2 and an inner edge E2'. The outer edge E2 of the seal portion 6 is located outside the outer edge E1 of the electrode stacking portion 5, and the inner edge E2' of the seal portion 6 is located inside the outer edge E1 of the electrode stacking portion 5. Also, as shown in FIG. 3(a), it is preferable that the seal portion 6 is disposed along the entire circumference of the outer edge E1 of the electrode stacking portion 5.

[0022] The electrodes in the electrode stacking portion usually have a current collector and an electrode layer disposed on at least one surface of the current collector. As shown in FIG. 3(b), the electrode stacking portion 5 may have, as the electrode E, a bipolar electrode (BP) having a current collector 1, a positive electrode active material layer 2 disposed on one surface of the current collector 1, and a negative electrode active material layer 3 disposed on the other surface of the current collector 1. Note that the electrode stacking portion in the present disclosure does not necessarily have a bipolar electrode. The electrode stacking portion 5 shown in FIG. 3(b) has, as the electrode E, a bipolar electrode BP1, a bipolar electrode BP2, a positive electrode side end electrode CA, and a negative electrode side end electrode AN. The positive electrode side end electrode CA has a current collector 1 and a positive electrode active material layer 2 disposed on one surface of the current collector 1. The negative electrode side end electrode AN has a current collector 1 and a negative electrode active material layer 3 disposed on one surface of the current collector 1. The number of electrodes is not particularly limited, and is, for example, 10 or more and 50 or less.

[0023] Also, as shown in FIG. 3(b), the electrode stacking portion 5 includes power generation units U (U1 to U3). The power generation unit U has a positive electrode active material layer 2, a negative electrode active material layer 3, and a separator 4 disposed between the positive electrode active material layer 2 and the negative electrode active material layer 3. Also, the electrode stacking portion in the present disclosure may have one power generation unit or two or more power generation units.

[0024] One power generation unit may be configured using two bipolar electrodes. In FIG. 3(b), the electrode laminate portion 5 has the bipolar electrode BP1 and the bipolar electrode BP2 in the thickness direction z. A separator 4 is disposed between the adjacent bipolar electrodes BP1 and BP2. The power generation unit U2 is composed of the positive electrode active material layer 2b in the bipolar electrode BP2, the negative electrode active material layer 3a in the bipolar electrode BP1, and the separator 4 disposed therebetween. On the other hand, the power generation unit U1 is composed of the positive electrode active material layer 2a in the bipolar electrode BP1, the negative electrode active material layer 3 in the negative electrode side end electrode AN, and the separator 4 disposed therebetween. Further, the power generation unit U3 is composed of the negative electrode active material layer 3b in the bipolar electrode BP2, the positive electrode active material layer 2 in the positive electrode side end electrode CA, and the separator 4 disposed therebetween.

[0025] Regarding the materials of the current collector, the positive electrode active material layer, the negative electrode active material layer, the separator, and the current collector in the electrode laminate portion, conventionally known materials can be used. Note that the positive electrode active material layer, the negative electrode active material layer, and the separator may contain an electrolyte. The electrolyte may be a liquid electrolyte (electrolyte solution) or a solid electrolyte. Here, when the separator contains a solid electrolyte, the separator can be regarded as a solid electrolyte layer. The electrolyte can also be a conventionally known material.

[0026] The material of the seal portion is not particularly limited, and examples thereof include thermoplastic resins. Examples of the thermoplastic resin include olefin resins such as polyethylene and polypropylene, and polyester resins such as polyethylene terephthalate.

[0027] (2) Intermediate member The intermediate member in the present disclosure is a member disposed on both surfaces of the battery cell in the thickness direction, and has a predetermined current collecting plate portion and an elastic body portion.

[0028] Figs. 4 and 5 are schematic plan views illustrating an intermediate member in the present disclosure. Specifically, Fig. 4 illustrates an intermediate member in which an elastic body portion is disposed in a notch portion of a current collecting plate portion, and Fig. 5 illustrates an intermediate member in which an elastic body portion is disposed outside an outer edge of a current collecting plate portion. Note that Fig. 4(b) is a view in which the elastic body portion is omitted from Fig. 4(a). Also, the elastic body portion is omitted in Figs. 4(c) and (d). Further, in Figs. 4 and 5, O1 indicates an outer edge (outer edge of a seal portion) of a battery cell, and O2 indicates an outer edge of the current collecting plate portion.

[0029] Here, as shown in Figs. 4(b) and 5(a), the outer edge of the current collecting plate portion means, when the current collecting plate portion 21 has sides L1 to L4, the outer edge (Fig. 5(a)) composed of sides L1 to L4 and intersections P1 to P4 of sides L1 to L4, or the outer edge (Fig. 4(b)) composed of sides L1 to L4 and intersections P1 to P4 of extension lines of sides L1 to L4.

[0030] As shown in Figs. 4(a) to (d), in the intermediate member 20 in the present disclosure, the current collecting plate portion 21 has a notch portion N, and the elastic body portion 22 may be disposed in the notch portion N. The notch portion usually penetrates the current collecting plate portion in the thickness direction.

[0031] The shape of the notch portion is not particularly limited. As shown in Figs. 4(a) to (d), the shape of the notch portion may be a rectangle such as a square, a rectangle, or a trapezoid, a circle such as an ellipse, or a triangle. Also, when the current collecting plate portion has a plurality of notch portions, the shapes of the notch portions may be the same or different.

[0032] The number and size of the cutouts are not particularly limited and can be adjusted as appropriate. Note that the number of cutouts is preferably two or more. This is because the load applied to the elastic body portion disposed in the cutout can be dispersed. Further, the position where the cutout is formed is not particularly limited, but as shown in FIG. 4(d), it is preferably formed on at least two opposing sides of the current collecting plate portion. In particular, as shown in FIGS. 4(a) to 4(c), it is preferably formed on all sides of the current collecting plate portion. Further, as will be described later, the elastic body portion disposed in the cutout overlaps with the seal portion in the thickness direction. Therefore, as shown in FIGS. 4(a) to 4(d), usually, at least a part of the region of the cutout exists inside the outer edge O1 of the battery cell.

[0033] Further, as shown in FIG. 4(a), the elastic body portion 22 disposed in the cutout N does not have to be in contact with the current collecting plate portion 21. On the other hand, although not particularly shown, the elastic body portion may be in contact with the current collecting plate portion. By having a gap between the elastic body portion and the current collecting plate portion, when a load is applied to the intermediate member and the elastic body portion is compressed, a space can be secured for the elastic body portion to expand, and damage to the current collecting plate portion can be suppressed.

[0034] Further, as shown in FIG. 5, in the intermediate member 20 in the present disclosure, the elastic body portion 22 may be disposed outside the outer edge O2 of the current collecting plate portion 21. In this case, as shown in FIG. 5(a), the elastic body portion 22 may be disposed outside the entire circumference of the outer edge O2 of the current collecting plate portion 21, or as shown in FIG. 5(b), it may be disposed outside a part of the outer edge O2 of the current collecting plate portion 21.

[0035] When the elastic body portion 22 is disposed outside the outer edge O2 of the current collecting plate portion 21, as shown in FIG. 5, the current collecting plate portion does not have to have the cutout described above. On the other hand, although not shown, in this case, the current collecting plate portion may have a cutout.

[0036] Further, the elastic body portion disposed outside the outer edge of the current collecting plate portion may or may not be in contact with the current collecting plate portion as described above.

[0037] When the battery is viewed in plan view from the thickness direction, the area of the current collecting plate portion in the intermediate member is smaller than the area of the power generation cell. Note that the area of the current collecting plate portion refers to the area of the current collecting plate portion excluding the notch portion when the current collecting plate portion has a notch portion.

[0038] When the battery is viewed in plan view from the thickness direction, the elastic body portion overlaps with the seal portion. A part of the region of the elastic body portion may overlap with the seal portion, or all of the regions of the elastic body portion may overlap with the seal portion.

[0039] The thickness of the elastic body portion in the intermediate member is not particularly limited as long as it can contact the seal portion of the adjacent battery cell.

[0040] The material of the current collecting plate portion is not particularly limited, and examples thereof include metal materials such as Al, Cu, SUS, and Ni.

[0041] The material of the elastic body portion is not particularly limited, and examples thereof include resin materials such as rubber, urethane, and resin sponge. Further, the Young's modulus of the elastic body portion is preferably smaller than the Young's modulus of the seal portion. If the Young's modulus of the elastic body portion is too large compared to the Young's modulus of the seal portion, for example, when the intermediate member is disposed on the battery cell and a compressive force is applied in the thickness direction, that is, when the elastic body portion is pressed by the seal portion of the battery cell, the seal portion may be compressed more than the elastic body portion and the seal portion may be damaged.

[0042] Here, when the intermediate member located at the first end of the battery, which is on the lower side in the direction of gravity, is defined as the first intermediate member, and the intermediate member located at the second end of the battery, which is on the upper side in the direction of gravity, is defined as the second intermediate member, it is preferable that the rigidity of the elastic body portion in the first intermediate member is greater than the rigidity of the elastic body portion in the second intermediate member. Here, the elastic body portion of the first intermediate member is referred to as the first elastic body portion, and the elastic body portion of the second intermediate member is referred to as the second elastic body portion. For example, in FIG. 1, the intermediate member 20a is the first intermediate member, and the intermediate member 20e is the second intermediate member. That is, in FIG. 1, it is preferable that the rigidity of the elastic body portion 22a is greater than the rigidity of the elastic body portion 22e. This is because deflection can be suppressed. For example, since at least the weight of the seal portion of the battery cell and the weight of the second elastic body portion are applied to the first elastic body portion, if the rigidity of the first elastic body portion is too small compared to the rigidity of the second elastic body portion, there is a risk of deflection. In particular, as shown in FIG. 1, when the battery includes a plurality of laminates, the deflection may become larger.

[0043] The rigidity of the elastic body portion can be calculated from the following formula. In the formula, K means the rigidity of the elastic body portion, E means the Young's modulus of the elastic body portion, A means the cross-sectional area of the elastic body portion, and L means the free length of the elastic body portion. K = EA / L

[0044] Also, as shown in FIG. 1, when the battery includes a plurality of laminates (L1 to L4), that is, when one or more elastic body portions (22b to 22d) are arranged between the first elastic body portion (22a) and the second elastic body portion (22e), if the rigidity of the first elastic body portion 22a is the largest and the rigidity of the second elastic body portion 22e is the smallest among all the elastic body portions, the rigidity of the other elastic body portions (22b to 22d) is not particularly limited. For example, the rigidity of the elastic body portions 22b to 22d may be the same as the rigidity of the first elastic body portion 22a, or may be the same as the rigidity of the second elastic body portion 22e. Also, the rigidity may decrease in the order of the first elastic body portion 22a, the elastic body portions 22b, 22c, 22e, and the second elastic body portion 22e.

[0045] Here, let the rigidities of the elastic body parts 22a to 22e in FIG. 1 be K1 to K5, respectively. Also, let the weight of the seal part in one laminate be M, and the weights of the elastic body parts 22a to 22e be m1 to m5, respectively. In this case, the rigidities K2 to K4 of the elastic body parts 22b to 22d may each have the following relationships with respect to K1. As described above, K5 may be the same as K4 or may be smaller than K4. K4 = [(M + m5) / (4M + m1 + m2 + m3 + m4 + m5)]K1 K3 = [(2M + m5 + m4) / (4M + m1 + m2 + m3 + m4 + m5)]K1 K2 = [(3M + m5 + m4 + m3) / (4M + m1 + m2 + m3 + m4 + m5)]K1

[0046] (3) Laminate In the laminate in the present disclosure, an adhesive layer may be disposed between the battery cell and the intermediate member described above. The adhesive layer preferably has conductivity. The thickness of the adhesive layer can be adjusted as appropriate, but it is preferably thin from the viewpoint of resistance suppression.

[0047] The battery may include one laminate. On the other hand, the battery may include a plurality of laminates laminated in the thickness direction. In the latter case, the number of laminates may be 3 or more, or 4 or more. Also, when the number of laminates is plural, as shown in FIG. 1, usually, adjacent laminates share an intermediate member.

[0048] 2. Other members As shown in FIG. 1, the battery in the present disclosure may include a buffer member 30 at at least one end in the thickness direction for absorbing the impact applied in the thickness direction and the expansion of the electrode laminate. Also, as shown in FIG. 1, the battery in the present disclosure may include an exterior body 40 for housing the above-described members.

[0049] 3. Battery and method for manufacturing battery The battery in the present disclosure may be, for example, a lithium-ion secondary battery. Further, the battery may be an all-solid-state battery containing a solid electrolyte as an electrolyte, or may be a liquid-based battery containing a liquid-based electrolyte (electrolyte solution) as an electrolyte. Further, examples of the use of the battery include power sources for vehicles such as hybrid vehicles (HEV), plug-in hybrid vehicles (PHEV), battery electric vehicles (BEV), gasoline vehicles, and diesel vehicles. In particular, it is preferably used as a driving power source for a hybrid vehicle (HEV), a plug-in hybrid vehicle (PHEV), or a battery electric vehicle (BEV). Further, the battery may be used as a power source for a moving body other than a vehicle (for example, a railway, a ship, an aircraft), or may be used as a power source for an electrical product such as an information processing device.

[0050] Further, in the present disclosure, it is also possible to provide a method for manufacturing the above-described battery. Specifically, it is a method for manufacturing a battery including a laminate having a battery cell and intermediate members respectively disposed on both surfaces of the battery cell in the thickness direction, the method including: a preparation step of preparing the battery cell; and an arrangement step of obtaining the laminate by arranging the intermediate members on both surfaces of the battery cell in the thickness direction. The battery cell has an electrode laminate portion in which a plurality of electrodes are laminated in the thickness direction and a seal portion disposed at an outer edge portion of the electrode laminate portion. The intermediate member has a current collector plate portion and an elastic body portion. When the laminate is viewed in plan from the thickness direction, the area of the current collector plate portion is smaller than the area of the battery cell. The current collector plate portion has a notch portion, and the elastic body portion is disposed in the notch portion and the elastic body portion overlaps with the seal portion. A method for manufacturing a battery can be provided.

[0051] A method for manufacturing a battery including a laminate having a battery cell and intermediate members disposed on both surfaces of the battery cell in the thickness direction, the method including: a preparation step of preparing the battery cell; and an arrangement step of obtaining the laminate by disposing the intermediate members on both surfaces of the battery cell in the thickness direction, wherein the battery cell has an electrode laminate portion in which a plurality of electrodes are laminated in the thickness direction and a seal portion disposed at an outer edge portion of the electrode laminate portion, the intermediate member has a current collector plate portion and an elastic body portion, when the laminate is viewed in a plan view from the thickness direction, the area of the current collector plate portion is smaller than the area of the battery cell, the elastic body portion is disposed outside the outer edge of the current collector plate portion, and the elastic body portion overlaps with the seal portion, and a method for manufacturing a battery can be provided.

[0052] Here, in the intermediate member disposed in the arrangement step, the thickness of the elastic body portion is usually larger than the thickness of the current collector plate portion. In other words, in a state where no load is applied to the intermediate member (current collector plate portion and elastic body portion), the thickness (free length) of the elastic body portion is usually larger than the thickness of the current collector plate portion. Since the thickness (free length) of the elastic body portion is larger than the thickness of the current collector plate portion, even when a difference in thickness occurs between the electrode laminate portion and the seal portion (when the thickness of the electrode laminate portion is larger than that of the seal portion), the elastic body portion can contact the seal portion, and the occurrence of the gap can be suppressed.

[0053] Note that the present disclosure is not limited to the above-described embodiment. The above-described embodiment is an example, and any configuration having substantially the same configuration as the technical idea described in the claims of the present disclosure and exhibiting the same operational effects is included in the technical scope of the present disclosure.

Explanation of Reference Numerals

[0054] 1... Current collector 2... Positive electrode active material layer 3... Negative electrode active material layer 4... Separator 5... Electrode laminate portion 6... Seal portion 10... Battery cell 20... Intermediate member 21... Current collector plate part 22... Elastic body part L... Laminate 100... Battery

Claims

1. A battery comprising a laminate having a battery cell and intermediate members disposed on both surfaces of the battery cell in the thickness direction, wherein the battery cell has an electrode laminate portion in which a plurality of electrodes are laminated in the thickness direction and a seal portion disposed so as to cover the outer edge of the electrode laminate portion, the intermediate member has a current collector plate portion and an elastic body portion, when the battery is viewed in plan from the thickness direction, the area of the current collector plate portion is smaller than the area of the battery cell, the current collector plate portion has a notch portion, the elastic body portion is disposed in the notch portion, and the elastic body portion overlaps with the seal portion, a battery.

2. A battery comprising a laminate having a battery cell and intermediate members disposed on both surfaces of the battery cell in the thickness direction, wherein the battery cell has an electrode laminate portion in which a plurality of electrodes are laminated in the thickness direction and a seal portion disposed so as to cover the outer edge of the electrode laminate portion, the intermediate member has a current collector plate portion and an elastic body portion, when the battery is viewed in plan from the thickness direction, the area of the current collector plate portion is smaller than the area of the battery cell, the elastic body portion is disposed outside the outer edge of the current collector plate portion, and the elastic body portion overlaps with the seal portion, a battery.

3. The battery according to claim 2, wherein the elastic body portion is disposed outside the entire circumference of the outer edge of the current collector plate portion.

4. When the intermediate member located at the first end portion of the battery, which is the lower side in the direction of gravity, is defined as the first intermediate member and the intermediate member located at the second end portion of the battery, which is the upper side in the direction of gravity, is defined as the second intermediate member, the rigidity of the elastic body portion in the first intermediate member is greater than the rigidity of the elastic body portion in the second intermediate member, the battery according to claim 1 or claim 2.

5. The battery according to claim 1 or claim 2, wherein the battery includes a plurality of the laminates laminated in the thickness direction.

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