Battery manufacturing method

Abstract

To provide a method of manufacturing a battery capable of reducing the permeation time of an electrolyte.SOLUTION: A method of manufacturing a battery includes: a preparation step of preparing an intermediate member 40 that has an unsealed part for injecting an electrolyte; an injection step of injecting an electrolyte 6 into the intermediate member via an unsealed part X; and a permeation step of making the injected electrolyte permeate the intermediate member. An electrode body has: a power generation element 10 whose planar view shape is a rectangle; and a first collector terminal 11 and a second collector terminal 12 connected with the power generation element. The power generation element has a first side S1 and a second side S2 corresponding to long sides in the rectangle, and a third side S3 and a fourth side S4 corresponding to short sides. The first collector terminal and the second collector terminal are arranged at the first side and the second side, respectively. At the permeation step, the electrolyte is made to permeate the intermediate member in a state (an arrangement state A) where the intermediate member is arranged so that the first side is on the vertical downside.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a method for manufacturing a battery. [Background technology]

[0002] A battery such as a lithium ion secondary battery has, for example, an electrode body and an exterior body that seals the electrode body. For example, Patent Document 1 discloses a method for manufacturing such a battery, which includes a step of preparing a temporary seal member, a step of arranging the temporary seal member in an upright state with the unsealed opening facing upward, a step of arranging a tip of an electrolyte injection nozzle directly above the unsealed opening, and a step of encapsulating the temporary seal member by heat sealing the unsealed opening after the injection step. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-122495 A Summary of the Invention [Problem to be solved by the invention]

[0004] For example, the electrode body has a power generating element having a rectangular shape in a plan view, and a positive electrode current collector terminal and a negative electrode current collector terminal connected to the power generating element. In a plan view, the positive electrode current collector terminal and the negative electrode current collector terminal may be disposed on two long sides of the power generating element so as to face each other. In such a case, an unsealed portion is usually provided on a short side of the power generating element (side on which the positive electrode current collector terminal and the negative electrode current collector terminal are not disposed) and an electrolyte is injected from the unsealed portion, but the penetration distance of the electrolyte becomes long, and therefore the penetration time also becomes long.

[0005] The present disclosure has been made in consideration of the above-mentioned circumstances, and has as its main object to provide a manufacturing method for a battery that can reduce the permeation time of an electrolyte solution. [Means for solving the problem]

[0006] The present disclosure provides a battery manufacturing method including a preparation step of preparing an intermediate member in which an electrode body is sealed with an outer casing and has an unsealed portion for injecting an electrolyte solution, an injection step of injecting an electrolyte solution into the intermediate member through the unsealed portion, and a permeation step of permeating the injected electrolyte solution into the intermediate member, wherein the electrode body has a power generation element having a rectangular shape in a planar view, and a first current collecting terminal and a second current collecting terminal connected to the power generation element, and in a planar view, the power generation element has a first side and a second side corresponding to the long sides of the rectangle, and a third side and a fourth side corresponding to the short sides of the rectangle, and the first current collecting terminal and the second current collecting terminal are arranged on the first side and the second side, respectively, and in the permeation step, the electrolyte solution is permeated into the intermediate member in a state (arrangement state A) in which the intermediate member is arranged so that the first side is vertically downward.

[0007] According to the present disclosure, by setting the arrangement state of the intermediate member in arrangement state A when the electrolyte is permeated, the permeation time of the electrolyte can be reduced.

[0008] In the above disclosure, in the injection process, the intermediate member is positioned so that the third side is vertically downward (positioning state B), and the electrolyte is injected into the intermediate member, and the intermediate member may be rotated between the injection process and the penetration process so as to change from positioning state B to positioning state A.

[0009] In the above disclosure, in the injecting step, the electrolyte may be injected into the intermediate member in the arrangement state A.

[0010] In the above disclosure, in the arrangement state A, the position of the unsealed portion may be higher than the position of the second side.

[0011] In the above disclosure, in a planar view, the exterior body has a first sealing portion arranged outside the first side, a second sealing portion arranged outside the second side, a third sealing portion arranged outside the third side, and a fourth sealing portion arranged outside the fourth side, wherein the first sealing portion is connected to a first extension portion extending on the opposite side of the power generating element with respect to the fourth sealing portion, and the second sealing portion is connected to a second extension portion extending on the opposite side of the power generating element with respect to the fourth sealing portion, and the manufacturing method may include a gas pocket process of forming a temporary sealing portion connected to the first extension portion and the second extension portion between the injection process and the penetration process, thereby forming a gas pocket composed of the first extension portion, the second extension portion, the fourth sealing portion, and the temporary sealing portion.

[0012] In the above disclosure, the manufacturing method may further include, after the infiltration step, an injection port sealing step of sealing the unsealed portion. Effect of the Invention

[0013] The battery manufacturing method according to the present disclosure has the effect of reducing the electrolyte penetration time. [Brief description of the drawings]

[0014] [Figure 1] 1A to 1C are schematic plan views illustrating a preparation step in the present disclosure. [Diagram 2] 1A-1C are schematic side views illustrating the injection and infiltration steps of the present disclosure. [Diagram 3] 1A-1C are schematic side views illustrating the injection and infiltration steps of the present disclosure. [Figure 4] 1A and 1B are a schematic plan view and a schematic cross-sectional view illustrating an electrode body in the present disclosure. [Diagram 5] 1 is a schematic cross-sectional view illustrating an example of an exterior body according to the present disclosure. [Figure 6] FIG. 2 is a schematic side view illustrating an intermediate member in the present disclosure. [Figure 7] 1A to 1C are schematic side views illustrating a method for manufacturing a battery in the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The battery of the present disclosure will be described in detail below with reference to the drawings. Each of the drawings shown below is a schematic illustration, and the size and shape of each part are appropriately exaggerated to facilitate understanding. In addition, hatching showing the cross section of a member is appropriately omitted in each drawing.

[0016] FIG. 1 is a schematic plan view illustrating a preparation step in the present disclosure, specifically illustrating a step of preparing an intermediate member in the present application. First, as shown in FIG. 1(a), an electrode body 20 is prepared, which has a power generating element 10 having a rectangular shape in a plan view, a first current collecting terminal 11 connected to the power generating element 10, and a second current collecting terminal 12 connected to the power generating element 10. One of the first current collecting terminal 11 and the second current collecting terminal 12 is a positive electrode current collecting terminal, and the other is a negative electrode current collecting terminal. In addition, the power generating element 10 has a first side S which corresponds to the long side of the rectangle. 1 and the second side S 2 The power generating element 10 has a third side S 3 and the fourth side S 4 The first collector terminal 11 and the second collector terminal 12 each have a first side S 1 and the second side S 2 and are disposed opposite each other with the power generating element 10 interposed therebetween.

[0017] Next, as shown in Fig. 1(b), an exterior body 30 is arranged so as to cover the entire outer periphery of the power generating element 10 in a plan view. Although not shown in Fig. 1(b), the exterior body 30 is arranged so as to cover both main surfaces (front and back surfaces) of the power generating element 10. In addition, a portion of the first current collecting terminal 11 and a portion of the second current collecting terminal 12 are each exposed from the exterior body 30.

[0018] Next, as shown in FIG. 1(c), the first side S 1 The first sealing portion S is disposed in the region of the exterior body 30 located on the outer side. a That is, the first side S1 Based on this, a first sealing portion S is provided in a region of the exterior body 30 on the opposite side to the power generating element 10. a Similarly, the second side S 2 The second sealing portion S is located in the outer region of the exterior body 30. b and the third side S 3 The third sealing portion S is located in the outer region of the exterior body 30. c and the fourth side S 4 The fourth sealing portion S is disposed in a region of the exterior body 30 located on the outer side. d The first sealing portion S a , second sealing part S b , third sealing part S c and the fourth sealing portion S d The shape of the third sealing portion S is, for example, linear. c In the embodiment, one end is a first sealing portion S a and the other end is connected to the second sealing portion S b On the other hand, the fourth sealing portion S d In the embodiment, one end is a first sealing portion S a The other end is connected to the second sealing portion S b The fourth sealing portion S is not connected to the fourth sealing portion S. d and the end of the second sealing portion S b The unsealed portion X between the electrode body 10 and the outer casing 30 functions as an injection port for injecting the electrolyte. In this manner, the electrode body 10 is sealed with the outer casing 30, and an intermediate member 40 having the unsealed portion X for injecting the electrolyte is obtained.

[0019] 2A and 2B are schematic side views illustrating the injection step and the infiltration step in the present disclosure. As shown in FIG. 2A, the intermediate member 40 is inserted along the third side S 3 2(c), the intermediate member 40 having the electrolyte 6 injected therein is placed on the first side S. This state of arrangement is referred to as state of arrangement B. Next, as shown in FIG. 2(b), while maintaining state of arrangement B, the electrolyte 6 is injected from the unsealed portion X. Next, as shown in FIG. 2(c), the intermediate member 40 having the electrolyte 6 injected therein is placed on the first side S. 12(c) is formed. The intermediate member 40 is arranged so that the upper surface of the intermediate member 40 is vertically downward. This arrangement is referred to as arrangement state A. That is, the intermediate member 40 is rotated from arrangement state B shown in FIG. 2(b) to arrangement state A shown in FIG. 2(c). While maintaining arrangement state A, the electrolyte solution 6 is allowed to permeate the entire intermediate member 40. Finally, the unsealed portion X is sealed as shown in FIG. 2(d), thereby obtaining the battery 100.

[0020] 3A and 3B are schematic side views illustrating the injection step and the infiltration step in the present disclosure, and illustrate steps different from those shown in FIG. 2. As shown in FIG. 3A, the intermediate member 40 is 1 The intermediate member 40 is arranged so that the upper surface of the intermediate member 40 faces downward in the vertical direction (arrangement state A). Next, as shown in FIG. 3(b), while maintaining arrangement state A, the electrolyte 6 is injected from the unsealed portion X. Next, as shown in FIG. 3(c), while maintaining arrangement state A, the electrolyte 6 is allowed to permeate the entire intermediate member 40. Finally, as shown in FIG. 3(d), the unsealed portion X is sealed to obtain the battery 100.

[0021] According to the present disclosure, the time required for the electrolyte to permeate can be reduced by setting the arrangement state of the intermediate member to arrangement state A when the electrolyte is permeated. As described above, in a plan view, the positive electrode collector terminal and the negative electrode collector terminal may be arranged to face each other on two long sides of the power generating element. An electrode body having such an arrangement is referred to as an electrode body α. The electrode body α can effectively exert a cooling function when cooling the power generating element via the positive electrode collector terminal and the negative electrode collector terminal, for example.

[0022] On the other hand, when injecting the electrolyte into the electrode body α, as shown in FIG. 2(b), an unsealed portion X is provided on the short side (the side on which the positive and negative collector terminals are not arranged) of the power generating element 10, and the electrolyte is injected from the unsealed portion X. In this case, since the permeation distance of the electrolyte depends on the length of the long side of the electrode body, the permeation distance becomes relatively long and the permeation time also becomes long. In contrast, in the present disclosure, as shown in FIG. 2(c), the intermediate member 40 into which the electrolyte 6 has been injected is sealed at the first side S 1The intermediate member 40 is arranged so that the electrode assembly 40 is vertically downward (arrangement state A). When the intermediate member 40 is permeated with the electrolyte 6 in arrangement state A, the permeation distance of the electrolyte depends on the length of the short side of the electrode body, so the permeation distance is relatively short and the permeation time is also short. In other words, the permeation time of the electrolyte can be reduced. Since the permeation time is proportional to the square of the aspect ratio, for example, when the ratio of the long side to the short side is 2, the permeation time can be reduced to 1 / 4 by employing the battery manufacturing method of the present disclosure.

[0023] 1. Preparation process The preparation step in the present disclosure is a step of preparing an intermediate member in which an electrode body is sealed with an exterior body and which has an unsealed portion for pouring an electrolyte solution into. The intermediate member may be produced by the user or may be purchased from another party.

[0024] (1) Electrode body Fig. 4(a) is a schematic plan view illustrating an electrode body in the present disclosure, and Fig. 4(b) is a cross-sectional view taken along line AA of Fig. 4(a). As shown in Fig. 4(a), the electrode body 20 has a power generating element 10 having a rectangular shape in a plan view, a first current collecting terminal 11 connected to the power generating element 10, and a second current collecting terminal 12 connected to the power generating element 10. The power generating element 10 has a first side S corresponding to the long side of the rectangle. 1 and the second side S 2 and the third side S, which corresponds to the short side of the rectangle. 3 and the fourth side S 4 That is, the first side S 1 and the second side S 2 corresponds to the opposing long sides of the rectangle, and the third side S 3 and the fourth side S 4 correspond to opposing short sides of a rectangle.

[0025] The aspect ratio (long side / short side) of the power generating element is, for example, 1.1 or more, and may be 1.5 or more, or may be 2.0 or more. On the other hand, the aspect ratio (long side / short side) of the power generating element is, for example, 10.0 or less, and may be 5.0 or less.

[0026] As shown in FIG. 4(a), the first collector terminal 11 and the second collector terminal 12 are disposed to face each other across the power generating element 10. The first collector terminal 11 is disposed on the first side S 1 The second collector terminal 12 is disposed on the second side S 2 The first current collecting terminal 11 and the second current collecting terminal 12 are, for example, metal current collecting terminals.

[0027] As shown in FIG. 4(b), the power generating element 10 has a first electrode layer 2, a separator 3, a second electrode layer 4, and a second current collector 5 in this order along the +z direction with respect to the first current collector 1. Similarly, the power generating element 10 has a first electrode layer 2, a separator 3, a second electrode layer 4, and a second current collector 5 in this order along the -z direction with respect to the first current collector 1. One of the first electrode layer 2 and the second electrode layer 4 is a positive electrode layer, and the other is a negative electrode layer. The positive electrode layer contains at least a positive electrode active material. The negative electrode layer contains at least a negative electrode active material. The separator has a gap through which the electrolyte can pass. The first current collector 1 and the first current collector terminal 11 are electrically connected. Similarly, the second current collector 5 and the second current collector terminal 12 are electrically connected.

[0028] The power generating element according to the present disclosure preferably has a plurality of power generating units each having a first electrode layer, a separator, and a second electrode layer, and in this case, the plurality of power generating units may be connected in parallel or in series.

[0029] (2) Exterior body The exterior body in the present disclosure is usually a laminate type exterior body. The laminate type exterior body has at least a structure in which a heat-sealing layer and a metal layer are laminated. The exterior body may have a heat-sealing layer, a metal layer, and a resin layer in this order along the thickness direction. Examples of materials for the heat-sealing layer include olefin resins such as polypropylene (PP) and polyethylene (PE). Examples of materials for the metal layer include aluminum, aluminum alloys, and stainless steel. Examples of materials for the resin layer include polyethylene terephthalate (PET) and nylon.

[0030] As shown in Fig. 5(a), the electrode body 20 may be sealed using a pair of exterior bodies 30a, 30b. That is, the electrode body 20 may be sealed by disposing the exterior body 30a on one main surface side of the electrode body 20 and disposing the exterior body 30b on the other main surface side of the electrode body 20. Also, as shown in Fig. 5(b), one exterior body 30 may be folded to seal the electrode body 20.

[0031] (3) Sealed and unsealed parts The intermediate member in the present disclosure has a sealed portion where the exterior bodies are fused. The sealed portion may be a portion where opposing exterior bodies are fused directly to each other, or a portion where opposing exterior bodies are fused to each other via a current collecting terminal. The sealed portion is usually formed by heat sealing.

[0032] The exterior body in the intermediate member preferably has a first sealing portion, a second sealing portion, a third sealing portion, and a fourth sealing portion as the sealing portions. 1 The first sealing part S is located on the outer side. a That is, the first side S 1 Based on this, a first sealing portion S is provided in a region of the exterior body 30 on the opposite side to the power generating element 10. a In addition, the first sealing portion S a is the first side S 1 Similarly, the exterior body 30 extends along the second side S 2 The second sealing portion S is located further outward. b And the third side S 3 The third sealing part S is located further out c And the fourth side S 4 The fourth sealing portion S is located further outward. d And, it has.

[0033] On the other hand, the intermediate member has an unsealed portion for injecting the electrolyte. The dimensions of the unsealed portion are not particularly limited, but may be, for example, a size that allows a nozzle for injecting the electrolyte to be inserted. Also, as shown in FIG. 6(a), in the arrangement state A, the position of the unsealed portion X is located on the second side S. 2 Position P2 It is preferable that the thickness is higher than the fourth side S. This is because the electrolyte can be prevented from flowing out of the intermediate member. 4 As shown in FIG. 6(a), the unsealed portion X may be higher than the midpoint of the fourth sealed portion S. d On the other hand, as shown in FIG. 6(b), the unsealed portion X may be disposed on the extension line of the fourth sealed portion S. d and the first sealing part S a Intersection with I da , and the fourth sealing portion S d and the second sealing part S b Intersection with I db As shown in FIG. 6(c), the unsealed portion X may be located on a line segment connecting the second sealed portion S b 3(b), when the electrolyte 6 is poured into the intermediate member 40 in the arrangement state A, the third side S 3 An unsealed portion may be placed on the side.

[0034] In addition, the sealing portion in the present disclosure may be a portion where the exterior body is folded. For example, as shown in FIG. 6(d), a third sealing portion S c The bent portion may be formed by folding the exterior body. Such a bent portion may be formed, for example, by using an exterior body 30 shown in FIG.

[0035] 2. Injection process The injection step in the present disclosure is a step of injecting an electrolyte into the intermediate member through the unsealed portion.

[0036] For example, as shown in FIG. 2(a), the intermediate member 40 is 3 The electrolyte may be injected into the intermediate member in a state where the intermediate member is arranged so that the third side is on the vertical lower side (arrangement state B). "The third side is on the vertical lower side" means that the following (i) and (ii) are satisfied. (i)D 31 and D. H The angle between the two is 45° or less. (ii)D 32 and D. VThe angle between the two is 45° or less. Here, as shown in Fig. 2(a), D 31 is the third side S 3 is the extension direction of D 32 D 31 Also, D H is the horizontal direction, and D V is the vertical direction. Also, D 31 and D. H The angle between the two may be 30° or less, 15° or less, or 5° or less. 32 and D. V The angle between the first and second electrodes may be 30° or less, 15° or less, or 5° or less. When the electrolyte is injected into the intermediate member in the arrangement state B, the intermediate member is rotated from the arrangement state B to the arrangement state A between the injection step and the penetration step.

[0037] For example, as shown in FIG. 3(a), the intermediate member 40 is 1 The electrolyte may be poured into the intermediate member in a state where the first side is on the lower side in the vertical direction (arrangement state A). "The first side is on the lower side in the vertical direction" means that the following (iii) and (iv) are satisfied. (iii)D 11 and D. H The angle between the two is 45° or less. (iv)D 12 and D. V The angle between the two is 45° or less. Here, as shown in FIG. 3(a), D 11 is the first side S 1 is the extension direction of D 12 D 11 Also, D H is the horizontal direction, and D V is the vertical direction. Also, D 11 and D. H The angle between the two may be 30° or less, 15° or less, or 5° or less. 12 and D. VThe angle formed by the above may be 30° or less, 15° or less, or 5° or less.

[0038] An example of a method for injecting the electrolyte solution is a method using a nozzle. For example, a nozzle is disposed near the unsealed portion, and the electrolyte solution is made to flow out from the nozzle, thereby injecting the electrolyte solution into the intermediate member sealed in the exterior body. In addition, a known electrolyte solution can be used as the electrolyte solution in the present disclosure. The flow direction of the electrolyte solution is not particularly limited, but may be a vertical downward direction, for example, as shown in FIG. 2(b). The phrase "the electrolyte solution flows out in a vertical downward direction" refers to the flow direction of the electrolyte solution being in a vertical downward direction. A The direction of gravity is D G In this case, D A and D. G The angle between the two is 30° or less. A and D. G The angle between the electrodes may be 15° or less, or may be 5° or less. The direction of outflow of the electrolyte may be horizontal, as shown in FIG. 3(b). In the present disclosure, "the direction of outflow of the electrolyte is horizontal" refers to the horizontal direction as D H In this case, D A and D. H The angle between the two is 30° or less. A and D. H The angle formed by may be 15° or less, or may be 5° or less.

[0039] 3.Infiltration process The permeation step in the present disclosure is a step of permeating the injected electrolyte into the intermediate member. The permeation step is also a step of permeating the electrolyte into the intermediate member in a state (arrangement state A) in which the intermediate member is arranged so that the first side is vertically downward. The definition of arrangement state A is as described above.

[0040] In the permeation step, the electrolyte (particularly, the electrolyte present in the dead space covered by the exterior body) permeates the intermediate member (particularly, the separator in the power generating element). The pressure environment in the permeation step may be normal pressure or reduced pressure. In addition, the atmosphere in the permeation step may be, for example, an inert gas atmosphere. The permeation time is not particularly limited, but may be, for example, 3 hours or more, or 5 hours or more.

[0041] 4.Gas pocket formation process The method for manufacturing a battery according to the present disclosure may include a gas pocket forming step of forming a gas pocket between the injection step and the penetration step. By forming the gas pocket, gas generated from the injected electrolyte can be collected. In addition, by forming the gas pocket, the intrusion of moisture can be suppressed.

[0042] 7 is a schematic side view illustrating a manufacturing method of a battery according to the present disclosure, specifically, a schematic side view illustrating a manufacturing method having a gas pocket forming step. First, an intermediate member 40 shown in FIG. 7(a) is prepared. In FIG. 7(a), the exterior body 10 has a first side S 1 The first sealing part S is located on the outer side. a and the second side S 2 The second sealing part S is located further outward. b And the third side S 3 The third sealing part S is located further out c And the fourth side S 4 The fourth sealing portion S is located further outward. d The third sealing portion S c In the embodiment, one end is a first sealing portion S a and the other end is connected to the second sealing portion S b On the other hand, the fourth sealing portion S d In the embodiment, one end is a first sealing portion S a The other end is connected to the second sealing portion S b The fourth sealing portion S d and the end of the second sealing portion S b There is an unsealed portion X between them.

[0043] As shown in FIG. 7(a), the first sealing portion S a is the fourth sealing portion S d Based on the reference, the first extension portion ES extending to the opposite side to the power generating element 10 a Similarly, the second sealing portion S b is the fourth sealing portion S d Based on this, the second extension portion ES extends to the opposite side of the power generating element 10. b The intermediate member 40 is connected to the third side S 3 is positioned vertically downward (arrangement state B).

[0044] Next, as shown in FIG. 7(b), in the arrangement state B, the electrolyte 6 is injected from the unsealed portion X. Next, as shown in FIG. 7(c), the first extension portion ES a and the second extension portion ES b Temporary sealing part S connected to t This forms the first extension portion ES a , second extension ES b , 4th sealing part S d and temporary sealing part S t A gas pocket G is formed. The gas pocket G is in communication with the power generating element 10 sealed in the exterior body 30 via the unsealed portion X. Next, as shown in FIG. 7(d), the intermediate member 40 into which the electrolytic solution 6 has been poured is placed on the first side S 1 7(c) to the vertically lower side (arrangement state A). That is, the intermediate member 40 is rotated from arrangement state B shown in FIG. 7(c) to arrangement state A shown in FIG. 7(d). While maintaining arrangement state A, the electrolyte 6 is allowed to permeate the entire intermediate member 40. Next, as shown in FIG. 7(e), the unsealed portion X is sealed. Thereafter, the gas pocket G is cut to obtain the battery 100.

[0045] 5. Inlet sealing process The method for manufacturing a battery according to the present disclosure may further include a step of sealing an injection port to seal the unsealed portion after the infiltration step. Examples of a method for sealing the unsealed portion include a method similar to the method for forming the sealed portion described above.

[0046] 6.Battery The battery of the present disclosure may be configured to cool the power generating element via at least one of the first and second current collecting terminals. For example, at least one of the first and second current collecting terminals may be thermally connected to a cooling device. Examples of the cooling device include a device that uses a refrigerant and a device that uses an electronic cooling element such as a Peltier element.

[0047] The type of the battery in the present disclosure is not particularly limited, but is typically a lithium ion secondary battery. Furthermore, the use of the battery in the present disclosure is not particularly limited, but examples thereof include power sources for vehicles such as hybrid electric vehicles (HEVs), electric vehicles (BEVs), gasoline-powered vehicles, and diesel-powered vehicles. In particular, it is preferable to use the battery as a driving power source for hybrid electric vehicles or electric vehicles. Furthermore, the battery in the present disclosure may be used as a power source for moving objects other than vehicles (e.g., railways, ships, and aircraft), and may be used as a power source for electrical products such as information processing devices.

[0048] The present disclosure is not limited to the above-described embodiments. The above-described embodiments are merely examples, and anything that has substantially the same configuration as the technical idea described in the claims of the present disclosure and exhibits similar effects is included in the technical scope of the present disclosure. [Explanation of symbols]

[0049] 1 … First current collector 2...First electrode layer 3 … Separator 4...Second electrode layer 5 … Second current collector 10 … Power generation elements 11 … 1st current collector terminal 12…Second current collector terminal 20 … Electrode body 30 … Exterior body 40 … Intermediate member 100…Battery

Claims

1. a preparation step of preparing an intermediate member in which the electrode body is sealed with an exterior body and which has an unsealed portion into which an electrolyte solution is injected; an injection step of injecting an electrolyte into the intermediate member through the unsealed portion; a permeation step of permeating the injected electrolyte into the intermediate member; A method for manufacturing a battery having the following: The electrode body includes a power generating element having a rectangular shape in a plan view, and a first current collecting terminal and a second current collecting terminal connected to the power generating element, In a plan view, the power generating element has a first side and a second side corresponding to long sides of the rectangle, and a third side and a fourth side corresponding to short sides of the rectangle, the first current collecting terminal and the second current collecting terminal are disposed on the first side and the second side, respectively; In the injection step, the electrolyte is injected into the intermediate member in a state (arrangement state B) in which the intermediate member is arranged so that the third side is on a lower side in a vertical direction; In the permeation step, the intermediate member is permeated with the electrolyte in a state (arrangement state A) in which the intermediate member is arranged so that the first side is on a lower side in a vertical direction, The method for manufacturing a battery, wherein the intermediate member is rotated so as to change from the arrangement state B to the arrangement state A during the injection step and the penetration step.

2. The method for manufacturing a battery according to claim 1 , wherein in the arrangement state A, a position of the unsealed portion is higher than a position of the second side.

3. In a plan view, the exterior body has a first sealing portion arranged outside the first side, a second sealing portion arranged outside the second side, a third sealing portion arranged outside the third side, and a fourth sealing portion arranged outside the fourth side, the first sealing portion is connected to a first extending portion extending on an opposite side to the power generating element with respect to the fourth sealing portion; the second sealing portion is connected to a second extending portion extending on an opposite side to the power generating element with respect to the fourth sealing portion; 3. The battery manufacturing method according to claim 1, further comprising a gas pocket process for forming a temporary sealing portion connected to the first extension portion and the second extension portion between the injection process and the penetration process, thereby forming a gas pocket composed of the first extension portion, the second extension portion, the fourth sealing portion, and the temporary sealing portion.

4. The method for producing a battery according to claim 1 , further comprising, after the infiltration step, a step of sealing an injection port to seal the unsealed portion.

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