Secondary battery and method for manufacturing a secondary battery

Abstract

To provide a secondary battery which can be manufactured efficiently and stably and a method for manufacturing a secondary battery.SOLUTION: In a secondary battery 1, a case body 110 has a first opening 111 in one end part and a second end part 112 in the other end part. The first opening 111 is sealed by a first sealing plate 121. The second opening 112 is sealed by a second sealing plate 122. A first through-hole 141 is provided in a region closer to the second opening 112 side than an edge part on the second opening 112 side of the electrode body 200 and the first through-hole 141 is sealed by a first sealing member 701. With that structure, the secondary battery 1 can be manufactured more efficiently and more stably.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present technology relates to a secondary battery and a method for manufacturing a secondary battery.

Background Art

[0002] Japanese Patent No. 4537353 (Patent Document 1) discloses a rectangular secondary battery in which an electrode group (25) is housed in a battery case (14) having openings (14a, 14b) at both ends, and electrode terminals (21, 23) are respectively attached to cap plates (33, 33') that seal the openings (14a, 14b).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By using a rectangular battery having a positive electrode terminal provided on one side surface of the battery case and a negative electrode terminal provided on the other end, it is easy to form a battery pack with a low height. However, there is room for further improvement in order to obtain a battery that can be manufactured efficiently and stably.

[0005] An object of the present technology is to provide a secondary battery and a method for manufacturing a secondary battery that can be manufactured efficiently and stably.

Means for Solving the Problems

[0006] The present technology provides the following secondary battery and method for manufacturing a secondary battery.

[0007] [1] A secondary battery comprising: a first electrode; a second electrode having a polarity different from that of the first electrode; an electrode body disposed between the first electrode and the second electrode and including a separator; and an outer casing housing the electrode body and an electrolyte, wherein the outer casing includes a case body having a first opening at one end and a second opening at the other end; a first sealing plate sealing the first opening; and a second sealing plate sealing the second opening, wherein the first sealing plate is provided with a first electrode terminal electrically connected to the first electrode; the second sealing plate is provided with a second electrode terminal electrically connected to the second electrode; a group of first electrode tabs electrically connected to the first electrode is provided at one end of the electrode body; and a group of second electrode tabs electrically connected to the second electrode is provided at the other end of the electrode body; and the case body is provided with a first through-hole in a region on the second opening side of the end of the electrode body on the second opening side, and the first through-hole is sealed by a first sealing member.

[0008] [2] The secondary battery according to [1], wherein in the case body, a second through hole is provided in a region on the first opening side of the first opening end of the electrode body, and the second through hole is sealed by a second sealing member.

[0009] [3] A secondary battery as described in [1] or [2], wherein D1 is the distance between the first sealing plate and the end of the electrode body on the first sealing plate side, and D2 is the distance between the second sealing plate and the end of the electrode body on the second sealing plate side, and the relationship D2 > D1.

[0010] [4] The electrode comprises a first electrode, a second electrode having a polarity different from that of the first electrode, an electrode body disposed between the first electrode and the second electrode and including a separator, and an outer casing that houses the electrode body and electrolyte, the outer casing including a case body having a first opening at one end and a second opening at the other end, a first sealing plate that seals the first opening, and a second sealing plate that seals the second opening, the first sealing plate being provided with a first electrode terminal electrically connected to the first electrode, and the second sealing plate being provided with a second electrode terminal electrically connected to the second electrode A method for manufacturing a secondary battery comprising the following steps: pouring an electrolyte solution into the outer casing through the first through hole; sealing the first through hole with the first sealing member. [Effects of the Invention]

[0011] This technology makes it possible to provide a secondary battery that can be manufactured efficiently and stably, as well as a method for manufacturing a secondary battery. [Brief explanation of the drawing]

[0012] [Figure 1] This is a front view of a rechargeable battery. [Figure 2] This figure shows the secondary battery shown in Figure 1 as viewed from the direction of arrow II. [Figure 3] This figure shows the secondary battery shown in Figure 1 as viewed from the direction of arrow III. [Figure 4] Figure 1 shows the secondary battery as viewed from the direction of arrow IV. [Figure 5] Figure 1 is a front cross-sectional view of a secondary battery. [Figure 6] This is a front view showing the negative electrode base plate before the negative electrode plate is formed. [Figure 7] Figure 6 is a cross-sectional view of the negative electrode plate along line VII-VII. [Figure 8] It is a front view showing a negative electrode plate formed from a negative electrode substrate. [Figure 9] It is a front view showing a positive electrode substrate before the positive electrode plate is formed. [Figure 10] It is an X-X cross-sectional view of the positive electrode substrate shown in FIG. 9. [Figure 11] It is a front view showing a positive electrode plate formed from a positive electrode substrate. [Figure 12] It is a view showing an electrode body and a current collector taken out from a secondary battery. [Figure 13] It is a view showing a connection structure between a negative electrode tab group and a negative electrode current collector. [Figure 14] It is a front view of the connection structure shown in FIG. 13. [Figure 15] It is a cross-sectional view of the connection structure shown in FIG. 13. [Figure 16] It is a view showing a process of inserting an electrode body into a case body. [Figure 17] It is a view showing a process of providing a spacer between a first sealing plate and an electrode body. [Figure 18] It is a cross-sectional view showing a state where a spacer is provided between a first sealing plate and an electrode body. [Figure 19] It is a view showing a modified example of a spacer. [Figure 20] It is a view showing an example of a mechanism for pressing an electrode body through a first sealing plate and a spacer. [Figure 21] It is a view showing a state of the mechanism shown in FIG. 20 as viewed from the Z-axis direction. [Figure 22] It is a perspective view of a spacer in another form. [Figure 23] It is a perspective view of a spacer in another form. [Figure 24] It is a perspective view of a spacer in another form. [Figure 25] It is a flowchart showing each process of a method for manufacturing a secondary battery.

Embodiments for Carrying Out the Invention

[0013] <Embodiments of this technology are described below. Note that the same or corresponding parts may be denoted by the same reference numerals, and their descriptions may not be repeated.

[0014] In the embodiments described below, when referring to the number, quantity, etc., unless otherwise specified, the scope of this technology is not necessarily limited to that number, quantity, etc. Also, in the embodiments described below, each component is not necessarily essential to this technology unless otherwise specified. Furthermore, this technology is not necessarily limited to achieving all of the effects and advantages mentioned in these embodiments.

[0015] In this specification, the terms "comprise," "include," and "have" are in open-ended form. That is, if a configuration includes one configuration, it may also include other configurations, or it may not.

[0016] Furthermore, where geometric terms and terms describing positional and directional relationships are used in this specification, such as "parallel," "orthogonal," "45° oblique," "coaxial," and "alongside," these terms allow for manufacturing tolerances or slight variations. Where terms describing relative positional relationships, such as "upper" and "lower," are used in this specification, these terms are used to indicate the relative positional relationship in a single state, and the relative positional relationship may be reversed or rotated to any angle depending on the installation direction of each mechanism (for example, by inverting the entire mechanism upside down).

[0017] In this specification, "battery" is not limited to lithium-ion batteries, but may include other batteries such as nickel-metal hydride batteries and sodium-ion batteries. In this specification, "electrode" may refer collectively to the positive electrode and the negative electrode. Also, "electrode plate" may refer collectively to the positive electrode plate and the negative electrode plate.

[0018] (Overall battery configuration) Figure 1 is a front view of the secondary battery 1 according to this embodiment. Figures 2 to 4 show the secondary battery 1 shown in Figure 1 as viewed from the directions of arrows II, III, and IV, respectively. Figure 5 is a front cross-sectional view of the secondary battery 1 shown in Figure 1.

[0019] The secondary battery 1 can be installed in electric vehicles (BEVs), plug-in hybrid electric vehicles (PHEVs), and hybrid electric vehicles (HEVs), etc. However, the use of the secondary battery 1 is not limited to automotive applications.

[0020] As shown in Figures 1 to 5, the secondary battery 1 includes an outer casing 100, an electrode body 200, and a current collector 300. The outer casing 100 includes a case body 110, a first sealing plate 121, and a second sealing plate 122.

[0021] In this specification, the X-axis direction (first direction) shown in Figures 1 to 5 is referred to as the "width direction" of the secondary battery 1 or case body 110, the Y-axis direction (second direction) is referred to as the "thickness direction" of the secondary battery 1 or case body 110, and the Z-axis direction (third direction) is referred to as the "height direction" of the secondary battery 1 or case body 110. Furthermore, in the description of this disclosure, the Z-axis direction is assumed to coincide with the top and bottom direction. Therefore, in the secondary battery 1 shown in Figure 1, the upper side of the figure is vertically upward, and the lower side of the figure is vertically downward. Thus, Figure 2 shows the view from the bottom.

[0022] When a battery pack including a secondary battery 1 is constructed, multiple secondary batteries 1 are stacked in the thickness direction. The stacked secondary batteries 1 may be constrained in the stacking direction (Y-axis direction) by a restraining member to form a battery module, or the battery pack may be directly supported on the side of the battery pack case without using a restraining member.

[0023] The case body 110 consists of a cylindrical, preferably rectangular, member. This results in a rectangular secondary battery 1. The case body 110 is made of metal. Specifically, the case body 110 is made of aluminum, aluminum alloy, iron, or iron alloy.

[0024] As shown in Figures 1 and 2, a first sealing plate 121 and a second sealing plate 122 are provided at both ends of the case body. The case body 110 can be formed into a rectangular tube shape by, for example, bringing together the ends of bent plate-shaped members (joint portion 110A as illustrated in Figure 2) and joining them together (for example, by laser welding). The corners of the "rectangular tube" may have a rounded shape.

[0025] In this embodiment, the case body 110 is formed to be longer in the width direction (X-axis direction) of the secondary battery 1 than in the thickness direction (Y-axis direction) and height direction (Z-axis direction) of the secondary battery 1. Therefore, a pair of opposing first walls 110Y are defined by the side shown in the figure and the opposite side, and a pair of opposing second walls 110Z are defined by the upper side and the lower side shown in the figure, and the area of ​​the pair of first walls 110Y is larger than the area of ​​the pair of second walls 110Z.

[0026] The X-axis dimension (width) of the case body 110 is preferably about 30 cm or more. This allows for the construction of a relatively large (high-capacity) secondary battery 1. The Z-axis dimension (height) of the case body 110 is preferably about 20 cm or less, more preferably about 15 cm or less, and even more preferably about 10 cm or less. This allows for the construction of a relatively low-height secondary battery 1, which improves, for example, its mountability in a vehicle.

[0027] As shown in Figure 3, a first opening 111 is provided at one end of the case body 110. The first opening 111 is sealed by a first sealing plate 121. The first sealing plate 121 is provided with a negative electrode terminal 131 (first electrode terminal) and a gas discharge valve 151. The positions of the negative electrode terminal 131 and the gas discharge valve 151 can be changed as appropriate. The first opening 111 and the first sealing plate 121 have a substantially rectangular shape with the Y-axis direction being the short side and the Z-axis direction being the long side.

[0028] As shown in Figure 4, a second opening 112 is provided at one end of the case body 110. The second opening 112 is sealed by a second sealing plate 122. The second sealing plate 122 is provided with a positive electrode terminal 132 (second electrode terminal) and a gas exhaust valve 152. The positions of the positive electrode terminal 132 and the gas exhaust valve 152 can be changed as appropriate. The second opening 112 and the second sealing plate 122 have a substantially rectangular shape with the Y-axis direction being the short side and the Z-axis direction being the long side.

[0029] The first sealing plate 121 and the second sealing plate 122 are made of metal. Specifically, the first sealing plate 121 and the second sealing plate 122 are made of aluminum, aluminum alloy, iron, or iron alloy, etc.

[0030] The negative terminal 131 is electrically connected to the negative electrode of the electrode body 200. The positive terminal 132 is electrically connected to the positive electrode of the electrode body 200.

[0031] The negative electrode terminal 131 is made of a conductive material (more specifically, a metal), such as copper or a copper alloy. A portion or layer made of aluminum or an aluminum alloy may be provided on the outer surface of the negative electrode terminal 131.

[0032] The positive terminal 132 is made of a conductive material (more specifically, a metal), which may be made of aluminum or an aluminum alloy, for example.

[0033] The gas discharge valves 151 and 152 rupture when the pressure inside the outer casing 100 exceeds a predetermined value, thereby discharging the gas inside the outer casing 100 to the outside.

[0034] The electrode body 200 is a flat-shaped electrode body having a positive electrode plate and a negative electrode plate, which will be described later. Specifically, the electrode body 200 is a wound-type electrode body in which a strip-shaped positive electrode plate and a strip-shaped negative electrode plate are wound together via a strip-shaped separator (not shown). However, in this specification, "electrode body" is not limited to a wound-type electrode body, and may also be a laminated-type electrode body in which multiple positive electrode plates and multiple negative electrode plates are stacked alternately. The electrode body may include multiple positive electrode plates and multiple negative electrode plates, and positive electrode tabs provided on each positive electrode plate may be stacked to form a group of positive electrode tabs, or negative electrode tabs provided on each negative electrode plate may be stacked to form a group of negative electrode tabs.

[0035] In this embodiment, a first through hole 141 and a second through hole 142 are provided on the second wall 110Z side of the upper surface of the case body 110 as shown in the figure. The first through hole 141 is sealed by a first sealing member 701. The second through hole 142 is sealed by a second sealing member 702. The first sealing member 701 and the second sealing member 702 can be crimped and fixed to the case body 110 using, for example, blind rivets and other metal members. The first sealing member 701 and the second sealing member 702 may also be fixed to the case body 110 by welding.

[0036] As will be explained later in the "Manufacturing Process of Secondary Battery 1," when the first through-hole 141 is used as the electrolyte injection hole, the second through-hole 142 functions as a gas (air) vent hole inside the case body 110. On the other hand, when the second through-hole 142 is used as the electrolyte injection hole, the first through-hole 141 functions as a gas (air) exhaust hole inside the case body 110.

[0037] As shown in Figure 5, the outer casing 100 houses the electrode body 200. The electrode body 200 is housed within the outer casing 100 such that its winding axis is parallel to the X-axis direction.

[0038] Specifically, one or more wound electrode bodies are housed inside the insulating sheet 600 (described later) placed within the outer casing 100, together with an electrolyte (not shown). As the electrolyte (non-aqueous electrolyte), for example, a non-aqueous solvent prepared by mixing ethylene carbonate (EC), ethyl methyl carbonate (EMC), and diethyl carbonate (DEC) in a volume ratio (25°C) of 30:30:40, in which LiPF6 is dissolved at a concentration of 1.2 mol / L can be used. Alternatively, a solid electrolyte may be used instead of the electrolyte.

[0039] The electrode body 200 includes a negative electrode tab group 210A (first electrode tab group) provided at the end (first end) on the first sealing plate 121 side, and a positive electrode tab group 220A (second electrode tab group) provided at the end (second end) on the second sealing plate 122 side. The negative electrode tab group 210A and the positive electrode tab group 220A are connected to the negative electrode and positive electrode of the electrode body 200, respectively. The negative electrode tab group 210A and the positive electrode tab group 220A are formed to protrude from the main body portion of the electrode body 200 (the portion in which the positive electrode plate and the negative electrode plate are stacked with a separator in between) toward the first sealing plate 121 and the second sealing plate 122. As a result, the negative electrode tab group 210A and the positive electrode tab group 220A are arranged so that their respective main surfaces face a pair of first walls 110Y, and their respective end surfaces face a pair of second walls 110Z.

[0040] The current collector 300 includes a negative electrode current collector 310 (first current collector) and a positive electrode current collector 320 (second current collector). The negative electrode current collector 310 and the positive electrode current collector 320 are each made of plate-shaped members. The electrode body 200 is electrically connected to the negative electrode terminal 131 and the positive electrode terminal 132 via the current collector 300.

[0041] The negative electrode current collector 310 is positioned on the first sealing plate 121 via a resin insulating member. The negative electrode current collector 310 is electrically connected to the negative electrode tab group 210A and the negative electrode terminal 131. The negative electrode current collector 310 is made of a conductive material (more specifically, a metal), which may be made of copper or a copper alloy, for example.

[0042] The positive electrode current collector 320 is placed on the second sealing plate 122 via a resin insulating member. The positive electrode current collector 320 is electrically connected to the positive electrode tab group 220A and the positive electrode terminal 132. The positive electrode current collector 320 is made of a conductive material (more specifically, a metal), and may be made of aluminum or an aluminum alloy, for example. The positive electrode tab group 220A may be electrically connected to the second sealing plate 122 directly or via the positive electrode current collector 320. In this case, the second sealing plate 122 may also serve as the positive electrode terminal 123.

[0043] If D1 is the distance between the first sealing plate 121 and the end of the electrode body 200 on the first sealing plate 121 side, and D2 is the distance between the second sealing plate 122 and the end of the electrode body 200 on the second sealing plate 122 side, then the relationship D2 > D1 holds. Here, the end 200t1 of the electrode body 200 on the first sealing plate 121 side is the end of the separator, and similarly, the end 200t2 of the electrode body 200 on the second sealing plate 122 side is the end of the separator.

[0044] Here, the separator is positioned between the positive and negative electrodes. The width of the separator (in the X direction in the figure) is greater than the width of the negative electrode plate 210 and positive electrode plate 220 that constitute the electrode body 200, which will be described later. Therefore, the separator end protrudes more than the ends of the negative electrode plate 210 and positive electrode plate 220. Accordingly, the separator end refers to the end of the separator that protrudes more than the ends of the negative electrode plate 210 and positive electrode plate 220. Note that the negative electrode tab 210B protruding from the negative electrode plate 210 and the positive electrode tab 220B protruding from the positive electrode plate 220 are not included in the width of the negative electrode plate 210 and positive electrode plate 220 that constitute the electrode body 200.

[0045] Thus, the space between the electrode body 200 and the sealing plate is larger on the second sealing plate 122 side than on the first sealing plate 121 side. Therefore, when used as an electrolyte injection port, it is preferable to use the first through-hole 141 located on the second sealing plate 122 side, which is not facing the electrode body 200, as the electrolyte injection port. Accordingly, it is preferable to use the second through-hole 142 located on the first sealing plate 121 side as an exhaust port for gas (air) inside the case body 110. However, the second through-hole 142 may also be used as an electrolyte injection port.

[0046] Preferably, the first through-hole 141 and the second through-hole 142 are located in the space between the electrode body 200 and the sealing plate, where the entire opening of the holes does not face the electrode body 200, but it is sufficient if only a portion of the opening of the holes is located in the space between the electrode body 200 and the sealing plate.

[0047] It is not necessarily required to provide both the first through-hole 141 and the second through-hole 142. At a minimum, by providing the first through-hole 141, it is possible to use it as both an electrolyte injection hole and an exhaust hole for gas (air) inside the outer casing 100.

[0048] (Configuration of electrode body 200) Figure 6 is a front view showing the negative electrode base plate 210S before the negative electrode plate 210 (first electrode) is formed, Figure 7 is a VII-VII cross-sectional view of the negative electrode base plate 210S shown in Figure 6, and Figure 8 is a front view showing the negative electrode base plate 210S that was formed from it.

[0049] The negative electrode plate 210 is manufactured by processing the negative electrode base plate 210S. As shown in Figures 6 and 7, the negative electrode base plate 210S includes a negative electrode core 211 and a negative electrode active material layer 212. The negative electrode core 211 is copper foil or copper alloy foil.

[0050] The negative electrode core body 211 has a negative electrode active material layer 212 formed on both sides, except for one end. The negative electrode active material layer 212 is formed by applying a negative electrode active material slurry using a die coater.

[0051] The negative electrode active material layer slurry is prepared by kneading graphite as the negative electrode active material, styrene-butadiene rubber (SBR) and carboxymethylcellulose (CMC) as binders, and water as a dispersion medium, so that the mass ratio of graphite:SBR:CMC is approximately 98:1:1.

[0052] The negative electrode core 211, to which the negative electrode active material layer slurry has been applied, is dried to remove water contained in the negative electrode active material layer slurry, thereby forming the negative electrode active material layer 212. Furthermore, by compressing the negative electrode active material layer 212, a negative electrode base plate 210S containing the negative electrode core 211 and the negative electrode active material layer 212 is formed. The negative electrode plate 210 is formed by cutting the negative electrode base plate 210S into a predetermined shape. The negative electrode base plate 210S can be cut by laser processing using energy beam irradiation, mold processing, or cutter processing.

[0053] As shown in Figure 8, a plurality of negative electrode tabs 210B, each made of a negative electrode core 211, are provided at one end in the width direction of the negative electrode plate 210 formed from the negative electrode base plate 210S. When the negative electrode plate 210 is wound, the plurality of negative electrode tabs 210B are stacked to form a negative electrode tab group 210A. The position and protruding length of each of the plurality of negative electrode tabs 210B are appropriately adjusted considering the state in which the negative electrode tab group 210A is connected to the negative electrode current collector 310. Note that the shape of the negative electrode tabs 210B is not limited to that exemplified in Figure 8.

[0054] Figure 9 is a front view showing the positive electrode base plate 220S before the positive electrode plate 220 (second electrode) is formed, Figure 10 is a cross-sectional view of the positive electrode base plate 220S shown in Figure 9, and Figure 11 is a front view showing the positive electrode plate 220 formed from the positive electrode base plate 220S.

[0055] The positive electrode plate 220 is manufactured by processing the positive electrode base plate 220S. As shown in Figures 9 and 10, the positive electrode base plate 220S includes a positive electrode core 221, a positive electrode active material layer 222, and a positive electrode protective layer 223. The positive electrode core 221 is aluminum foil or aluminum alloy foil.

[0056] A positive electrode active material layer 222 is formed on the positive electrode core 221, except for one end on both sides. The positive electrode active material layer 222 is formed on the positive electrode core 221 by applying a positive electrode active material slurry using a die coater.

[0057] The positive electrode active material layer slurry is prepared by kneading lithium nickel cobalt manganese composite oxide as the positive electrode active material, polyvinylidene fluoride (PVdF) as a binder, carbon material as a conductive material, and N-methyl-2-pyrrolidone (NMP) as a dispersion medium, such that the mass ratio of lithium nickel cobalt manganese composite oxide:PVdF:carbon material is approximately 97.5:1:1.5.

[0058] The positive electrode protective layer 223 is in contact with the positive electrode core 221 and is formed on one end of the positive electrode active material layer 222 in the width direction. The positive electrode protective layer 223 is formed on the positive electrode core 221 by applying a positive electrode protective layer slurry with a die coater. The positive electrode protective layer 223 has an electrical resistance greater than that of the positive electrode active material layer 222.

[0059] The positive electrode protective layer slurry is prepared by kneading alumina powder, carbon material as a conductive material, PVdF as a binder, and NMP as a dispersion medium, such that the mass ratio of alumina powder:carbon material:PVdF is approximately 83:3:14.

[0060] The positive electrode core 221, to which the positive electrode active material layer slurry and positive electrode protective layer slurry have been applied, is dried to remove NMP contained in the positive electrode active material layer slurry and positive electrode protective layer slurry, thereby forming the positive electrode active material layer 222 and the positive electrode protective layer 223. Furthermore, by compressing the positive electrode active material layer 222, a positive electrode base plate 220S containing the positive electrode core 221, the positive electrode active material layer 222, and the positive electrode protective layer 223 is formed. The positive electrode plate 220 is formed by cutting the positive electrode base plate 220S into a predetermined shape. The positive electrode base plate 220S can be cut by laser processing using energy beam irradiation, mold processing, or cutter processing.

[0061] As shown in Figure 11, a plurality of positive electrode tabs 220B, each consisting of a positive electrode core 221, are provided at one end in the width direction of the positive electrode plate 220 formed from the positive electrode base plate 220S. When the positive electrode plate 220 is wound, the plurality of positive electrode tabs 220B are stacked to form a group of positive electrode tabs 220A. The position and protruding length of each of the plurality of positive electrode tabs 220B are appropriately adjusted considering the state in which the group of positive electrode tabs 220A is connected to the positive electrode current collector 320. Note that the shape of the positive electrode tabs 220B is not limited to that shown in Figure 11.

[0062] A positive electrode protective layer 223 is provided at the base of each of the multiple positive electrode tabs 220B. A positive electrode protective layer 223 is not necessarily provided at the base of each positive electrode tab 220B. It is preferable that the thickness of the positive electrode protective layer 223 is smaller than the thickness of the positive electrode active material layer 222.

[0063] In a typical example, the thickness of one negative electrode tab 210B is smaller than the thickness of one positive electrode tab 220B. In this case, the thickness of the negative electrode tab group 210A is smaller than the thickness of the positive electrode tab group 220A.

[0064] (Connection structure between electrode body 200 and current collector 300) Figure 12 shows the electrode body 200 and current collector 300 taken from the secondary battery 1. As shown in Figure 12, the electrode body 200 is formed by stacking two electrode bodies 201 and 202, each being a wound-type electrode body. In the example shown in Figure 12, a structure in which two wound-type electrode bodies are stacked is shown, but the electrode body 200 may be composed of one wound-type electrode body, or of three or more wound-type electrode bodies, or of a stacked electrode body.

[0065] The negative electrode tab group 210A is joined to the negative electrode current collector 310 at the joint 310A, and the positive electrode tab group 220A is joined to the positive electrode current collector 320 at the joint 320A. The joints 310A and 320A can be formed by, for example, ultrasonic bonding, resistance welding, laser welding, crimping, etc.

[0066] Figure 13 shows the connection structure between the negative electrode tab group 210A and the negative electrode current collector 310. Figures 14 and 15 are a front view and a cross-sectional view, respectively, of the connection structure shown in Figure 13.

[0067] As shown in Figures 13 to 15, the negative electrode current collector 310 is connected to the negative electrode terminal 131 between the electrode body 200 and the first sealing plate 121. The negative electrode current collector 310 includes a first conductive member 311 and a second conductive member 312. The first conductive member 311 and the second conductive member 312 are joined at a joint 313.

[0068] The negative electrode tab group 210A is joined to the first conductive member 311 of the negative electrode current collector 310 at the joint 310A. The first conductive member 311 is connected to the second conductive member 312 at the joint 313. The joint 313 can be formed by, for example, ultrasonic bonding, resistance welding, laser welding, crimping, etc.

[0069] The first conductive member 311 and the second conductive member 312 are attached to the inner surface of the first sealing plate 121 via a resin insulating member 410. The insulating member 410 is provided so as to reach from the outer surface to the inner surface of the first sealing plate 121 through a through hole provided in the first sealing plate 121. The insulating member 410 may be composed of multiple parts, including a member positioned between the negative terminal 131 and the first sealing plate 121, and a component positioned between the first conductive member 311 and the second conductive member 312 and the first sealing plate 121.

[0070] The negative electrode terminal 131 is attached to the first sealing plate 121 via a resin insulating member 410A. The negative electrode terminal 131 is exposed on the outside of the first sealing plate 121 and is positioned to reach the second conductive member 312 of the negative electrode current collector 310, which is provided on the inner surface side of the first sealing plate 121. The negative electrode terminal 131 and the second conductive member 312 can be connected by, for example, ultrasonic bonding, resistance welding, laser welding, crimping, etc. In this embodiment, a through hole is provided in the second conductive member 312, the negative electrode terminal 131 is inserted into the through hole, the negative electrode terminal 131 is crimped on the second conductive member 312, and then the crimped portion and the second conductive member 312 are welded at the joint 131A to connect the negative electrode terminal 131 and the second conductive member 312.

[0071] The assembly procedure for each component is as follows: First, the negative electrode terminal 131 and the second conductive member 312 are attached to the first sealing plate 121 together with the insulating members 410 and 410A. Next, the first conductive member 311, which is connected to the electrode body 200, is attached to the second conductive member 312. At this time, the first conductive member 311 is positioned on the insulating member 410 such that a part of the first conductive member 311 overlaps with the second conductive member 312. Subsequently, the first conductive member 311 and the second conductive member 312 are welded together at the joint 313. Note that the insulating members 410 and 410A may be composed of a single piece.

[0072] However, the negative terminal 131 may be electrically connected to the first sealing plate 121. Alternatively, the first sealing plate 121 may also function as the negative terminal 131.

[0073] In Figures 13 to 15, a negative electrode current collector 310 consisting of two parts (a first conductive member 311 and a second conductive member 312) is shown as an example, but the negative electrode current collector 310 may be composed of a single part.

[0074] Figures 13 to 15 show the connection structure on the negative electrode side, but the basic connection structure on the positive electrode side is the same as that on the negative electrode side.

[0075] (Insertion process of electrode body 200) Figure 16 shows the process of inserting the electrode body 200 into the case body 110. As shown in Figure 16, a resin insulating sheet 600 (electrode body holder) is placed between the electrode body 200 and the case body 110.

[0076] The insulating sheet 600 may be made of, for example, a resin. More specifically, the material of the insulating sheet 600 may be, for example, polypropylene (PP), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyimide (PI), or polyolefin (PO).

[0077] The insulating sheet 600 does not necessarily need to cover the entire surface of the electrode body 200. Preferably, the insulating sheet 600 covers an area of ​​50% or more, more preferably 70% or more, of the outer surface of the electrode body. Preferably, the insulating sheet 600 covers the entirety of four of the six surfaces of the substantially rectangular parallelepiped (flat-shaped) electrode body 200, excluding the two surfaces on which the negative electrode tab group 210A and the positive electrode tab group 220A are formed, respectively.

[0078] Figure 17 shows the process of placing a spacer 510 between the first sealing plate 121 and the electrode body 200. Figure 18 is a cross-sectional view showing the state in which the spacer 510 is placed between the first sealing plate 121 and the electrode body 200.

[0079] As shown in Figures 17 and 18, the group of negative electrode tabs 210A extending from the electrode body 200 toward the first sealing plate 121 is curved so that it extends from the center of the first sealing plate 121 in the Y-axis direction toward the end, and then folds back toward the center in the opposite direction. A spacer 510 is provided to accommodate the curved group of negative electrode tabs 210A (curved portion).

[0080] The spacer 510 includes a first spacer 511 and a second spacer 512. The first spacer 511 and the second spacer 512 engage with each other by sliding along the Y-axis from the end side to the center side of the first sealing plate 121. This fixes the spacer 510 to the first sealing plate 121 via the insulating member 410, increasing the stability of the spacer 510's position.

[0081] As shown in Figure 18, the spacer 510 forms an internal space for housing the negative electrode current collector 310, and the tip portions of the negative electrode tab group 210A are also housed in the internal space of the spacer 510. The spacer 510 has a hole through which the negative electrode tab group 210A can pass.

[0082] The material of the spacer 510 is not particularly limited, but it is preferable to use an insulating material such as resin. More specifically, it is preferable to use a sheet made of polyolefin (PO). Alternatively, an insulating sheet 600 may be interposed between the spacer 510 and the electrode body 200.

[0083] Referring again to Figure 16, in the manufacturing method of the secondary battery 1 according to this embodiment, after electrically connecting the negative electrode terminal 131 and the negative electrode tab group 210A, the electrode body 200 is inserted into the case body 110 from the end side of the positive electrode tab group 220A through the first opening 111. When the electrode body 200 is inserted to a predetermined position in the case body 110, the positive electrode tab group 220A protrudes to the outside of the case body 110 through the second opening 112 of the case body 110. This allows the connection between the positive electrode terminal 132 and the positive electrode tab group 220A to be made after inserting the electrode body 200 into the case body 110.

[0084] When electrically connecting the negative electrode terminal 131 attached to the first sealing plate 121 with the negative electrode tab group 210A after inserting the electrode body 200 into the case body 110, the negative electrode tab group 210A must be long enough to protrude sufficiently outside the case body 110. By electrically connecting the negative electrode terminal 131 attached to the first sealing plate 121 with the negative electrode tab group 210A before inserting the electrode body 200 into the case body 110, the length of the negative electrode tab group 210A can be reduced compared to when it is attached after inserting the electrode body 200 into the case body 110. As a result, the volume occupancy rate of the negative electrode plate 210 and positive electrode plate 220 in the internal space of the case body 110 can be increased.

[0085] Furthermore, in the example shown in Figure 16, the electrode body 200 is inserted into the case body 110 after the spacer 510, which houses the curved portion of the negative electrode tab group 210A, has been placed. This protects the curved portion of the negative electrode tab group 210A during the insertion process of the electrode body 200. It is preferable to provide an opening 510h in the spacer 510 at a position opposite the second through hole 142 to allow the electrolyte to pass through. The shape of the opening 510h is not limited to a circle, but can be any shape that allows the electrolyte to pass through.

[0086] Furthermore, in the example shown in Figure 16, the electrode body 200 is inserted into the case body 110 while covered with an insulating sheet 600. This helps to suppress damage to the electrode body 200 when it is inserted into the case body 110.

[0087] The case body 110 can be held at a predetermined angle during the electrode body 200 insertion process. For example, it is preferable to insert the electrode body 200 while holding the case body 110 so that the X-axis direction (width direction of the case body 110) intersects the horizontal direction at an angle of approximately ±45° or less. For example, the case body 110 can be tilted so that in the vertical direction, the upper end of the first opening 111 into which the electrode body 200 is inserted is located above the upper end of the second opening 112, and the electrode body 200 can be inserted into the case body 110.

[0088] The electrode insertion step is not limited to pushing the electrode 200 in from the first opening 111 side, but may also be performed by pulling the electrode 200 from the second opening 112 side, for example.

[0089] When viewing the positive electrode tab group 220A through the first through-hole 141 in the second wall 110Z, it is preferable that the positive electrode tab group 220A bends to avoid the first through-hole 141. This is because it improves the ease of pouring the electrolyte. Similarly, when viewing the negative electrode tab group 210A through the second through-hole 142 in the second wall 110Z, it is preferable that the negative electrode tab group 210A bends to avoid the second through-hole 142. This configuration improves the ease of pouring the electrolyte in the manufacturing process of the secondary battery 1, which will be described later.

[0090] Figure 19 shows a modified example of the spacer 510. In the examples of Figures 16 to 18, the spacer 510 is positioned in a part of the height direction (Z-axis direction) of the first sealing plate 121, but as shown in Figure 19, the spacer 510 may be positioned over substantially the entire height direction of the first sealing plate 121. In this case, the spacer 510 may have a portion that protrudes toward the electrode body 200 at a position spaced apart from the negative electrode tab group 210A in the Z-axis direction (first region) compared to the vicinity of the negative electrode tab group 210A (second region). A step (preferably a step of about 1 mm or more) may be formed at the boundary between the first region and the second region. By doing so, damage to the negative electrode tab group 210A when inserting the electrode body 200 into the case body 110 can be suppressed.

[0091] (Mechanism for pressing the electrode body) Figure 20 shows an example of a mechanism for pressing the electrode body 200 via the first sealing plate 121 and spacer 510A. Figure 21 shows the mechanism shown in Figure 20 viewed from the Z-axis direction. Spacer 510A is a modified version of the spacer 510 described above.

[0092] As shown in Figures 20 and 21, the spacer 510A is positioned in the height direction (Z-axis direction) of the first sealing plate 121 and electrode body 200, avoiding the negative electrode tab group 210A and the negative electrode current collector 310 (a position spaced apart from the negative electrode tab group 210A and the negative electrode current collector 310). More specifically, the spacer 510A is positioned in two locations, sandwiching the negative electrode tab group 210A in the Z-axis direction. It is preferable that the spacer 510A presses against the portion of the electrode body 200 where the negative electrode tab group 210A is not provided. In particular, it is preferable that it presses against the portion where the separator protrudes beyond the end of the negative electrode plate 210. The spacer 510A may be provided on only one side of the negative electrode tab group 210A in the Z-axis direction. The spacer 510A can be fixed to the first sealing plate 121 and / or electrode body 200 by methods such as adhesive bonding, welding, or tape application. The spacer 510A may also come into contact with the negative electrode tab group 210A.

[0093] In the spacer 510A, it is preferable to provide through holes, notches, slits, etc., at the positions opposite the first through holes 141. Furthermore, it is preferable to provide through holes, notches, slits, etc., at the positions opposite the gas exhaust valve 151 in the spacer 510A. This ensures more reliable function of the first through holes 141 or the gas exhaust valve 151.

[0094] In the examples shown in Figures 20 and 21, the electrode body 200 is inserted into the case body 110 by pressing it through the spacer 510A. In the initial stages of the electrode body 200 insertion process, the electrode body 200 may be held in place, and after a portion of the electrode body 200 has been inserted into the case body 110, the electrode body 200 may be further inserted by pressing it through the spacer 510A.

[0095] Instead of the spacer described above, a spacer fixed to the electrode body 200 may be provided. The spacer can be fixed to the electrode body 200, for example, by attaching it with tape.

[0096] Furthermore, from the viewpoint of protecting the positive electrode tab group 220A, the spacers 510 and 510A may be provided on the positive electrode tab group 220A side. In the spacers placed on the positive electrode tab group 220A side, it is preferable to provide an opening for the electrolyte to pass through at a position where the first through hole 141 is facing each other. The shape of the opening can be any shape as long as it allows the electrolyte to pass through.

[0097] Here, other forms of spacers are illustrated with reference to Figures 22 to 24. Figure 22 is a perspective view of another form of spacer 510B, Figure 23 is a perspective view of another form of spacer 510C, and Figure 24 is a perspective view of another form of spacer 510D.

[0098] The spacer 510B shown in Figure 22 has a rectangular opening 510h1 on the side facing the electrode body 200. In the case of this spacer 510B, the opening 510h1 is located in a position that does not face the first through hole 141 (or the second through hole 142).

[0099] The spacer 510C shown in Figure 23 has a slit-shaped opening 510h2 positioned diagonally on the side facing the electrode body 200. By providing the slit-shaped opening 510h2, a sufficient opening area is secured, ensuring the flow path area necessary for degassing and liquid injection, and furthermore, it has the advantage that the injected solvent is less likely to accumulate.

[0100] The spacer 510D shown in Figure 24 has a rectangular opening 510h3 on the side facing the first through hole 141 (or second through hole 142). At the position of this opening 510h3, it is positioned perpendicular to the curvature direction of the electrode tab. As a result, peeling of the separator and damage to the electrode (including the tab) due to the force of the injected fluid can be prevented, the pressure during electrode insertion can be made uniform, and the curved electrode tab can be prevented from protruding from the space within the spacer.

[0101] The external shape, position, and shape of the spacer are not limited to the spacer described above, but by providing appropriate openings in the spacer placed for the purpose of protecting the positive electrode tab group 220A and the negative electrode tab group 210A, it is possible to suppress damage to the electrode body, suppress unintended short circuits, and suppress a decrease in electrolyte injection performance.

[0102] (Manufacturing process for secondary battery 1) Figure 25 is a flow chart showing each step of the manufacturing method for secondary battery 1. As shown in Figure 25, in S10, the case body 110 is prepared. Next, in S20, the electrode body 200 is manufactured. In S30, the electrode terminals provided on the first sealing plate 121 and the second sealing plate 122 are electrically connected to the electrode tab group of the electrode body 200. At this time, first the negative electrode terminal 131 and the negative electrode tab group 210A are electrically connected (S31), then a spacer 510 is placed between the first sealing plate 121 on the negative electrode side and the electrode body 200 (S40), and then the electrode body 200 is inserted into the case body 110 (S50). At this time, the positive electrode tab group 220A protrudes to the outside of the case body 110 from the second opening 112 of the case body 110. After the electrode body 200 is inserted into the case body 110, the positive electrode terminal 132 and the positive electrode tab group 220A are electrically connected (S32).

[0103] In this embodiment, an example has been described in which the following steps are performed: connecting the negative electrode terminal 131 to the negative electrode tab group 210A (S31), inserting the electrode body 200 (S50), and connecting the positive electrode terminal 132 to the positive electrode tab group 220A (S32). However, the scope of this technology is not limited to this, and the following steps may also be performed: connecting the positive electrode terminal 132 to the positive electrode tab group 220A (S32), inserting the electrode body 200 (S50), and connecting the negative electrode terminal 131 to the negative electrode tab group 210A (S31).

[0104] After the connection between the electrode terminals and the electrode tab group (S30) is completed, the first opening 111 and the second opening 112 are sealed with the first sealing plate 121 and the second sealing plate 122 (S60). The sealing process with the first sealing plate 121 and the second sealing plate 122 is performed, for example, by laser welding.

[0105] The step of sealing the first opening 111 with the first sealing plate 121 on the negative electrode side (S61) may be performed after the step of inserting the electrode body 200 into the case body 110 (S50), and the step of sealing the second opening 112 with the second sealing plate 122 on the positive electrode side (S62) may be performed after the step of electrically connecting the positive electrode terminal 132 and the positive electrode tab group 220A (S32).

[0106] Therefore, for example, the step of sealing the first opening 111 with the first sealing plate 121 (S61) may be performed before the step of electrically connecting the positive terminal 132 and the positive tab group 220A (S32), or the step of sealing the first opening 111 with the first sealing plate 121 (S61) may be performed after the step of sealing the second opening 112 with the second sealing plate 122 (S62). Furthermore, it is also possible to perform at least a part of the sealing steps (S61, S62) with the first sealing plate 121 and the second sealing plate 122 simultaneously.

[0107] Next, the electrolyte is injected into the outer casing 100 through the first through-hole 141 (S70). It is preferable to use the first through-hole 141, which is located on the side of the second sealing plate 122 where there is a large space between the electrode body 200 and the sealing plate, as the injection port for the electrolyte. On the other hand, since the opposite side has a second through-hole 142, it is preferable to use this second through-hole 142 as an exhaust port for gas (air or nitrogen, etc.) inside the outer casing 100. This improves the efficiency of injecting the electrolyte into the outer casing 100.

[0108] In the case body 110, by injecting the electrolyte into the case body 110 from the first through-hole 141 located in the region closer to the second opening 112 than the end of the electrode body 200 on the second opening 112 side, the electrolyte can be injected from a region of the case body 110 that does not face the electrode body 200 (excluding the tab group), thus improving the injection efficiency. Furthermore, by providing the first through-hole 141 in the case body 110, it becomes easier to inject the electrolyte into the case body 110 when the longitudinal direction of the case body 110 is horizontal or nearly horizontal. This effectively suppresses damage to the electrode body 200. It also suppresses dripping of the electrolyte.

[0109] When pouring the electrolyte into the outer casing 100, it is preferable to place the outer casing 100 on a horizontal surface so that the second wall 110Z, which has the first through-hole 141, is facing upwards. Alternatively, the outer casing 100 may be tilted (with the second through-hole 142 facing downwards) so that the second wall 110Z is at an angle of 45 degrees or less, preferably 30 degrees or less, and more preferably 15 degrees or less, and the electrolyte may be poured into the outer casing 100. This improves the ease with which the electrolyte can be poured into the outer casing 100.

[0110] After the electrolyte has been injected into the outer casing 100, the first through-hole 141 is sealed with the first sealing member 701 (first sealing step), and the second through-hole 142 is sealed with the second sealing member 702 (second sealing step). The first sealing step and the second sealing step may be performed in either order. The first sealing member 701 and the second sealing member 702 are crimped and fixed to the case body 110 using, for example, blind rivets and other metal members. Alternatively, the first sealing member 701 and the second sealing member 702 are fixed to the case body 110 by welding.

[0111] Here, after performing either the first sealing step or the second sealing step described above, a charging step is performed to charge the electrode body 200, and after this charging step, the other of the first sealing step or the second sealing step described above is performed. After sealing the through hole on one side, charging is performed and the generated gas is exhausted to the outside of the outer casing 100. Subsequently, by sealing the through hole on the other side, swelling of the outer casing 100 can be suppressed.

[0112] (summary) The secondary battery 1 and the method for manufacturing the secondary battery 1 according to this embodiment can be summarized as follows:

[0113] This secondary battery 1 comprises a negative electrode plate 210S, a positive electrode plate 220S having a different polarity from the negative electrode plate 210S, an electrode body 200 including a separator disposed between the negative electrode plate 210S and the positive electrode plate 220S, and an outer casing 100 that houses the electrode body 200 and the electrolyte. The outer casing 100 includes a case body 110 having a first opening 111 at one end and a second opening 112 at the other end, a first sealing plate 121 that seals the first opening 111, and a second sealing plate 122 that seals the second opening 112. The first sealing plate 121 is provided with a negative electrode terminal 131 electrically connected to the negative electrode plate 210S, and the second sealing plate 122 is provided with a positive electrode terminal 132 electrically connected to the positive electrode plate 220S. One end of the electrode body 200 is provided with a group of negative electrode tabs 210A electrically connected to a negative electrode base plate 210S, and the other end of the electrode body 200 is provided with a group of positive electrode tabs 220A electrically connected to a positive electrode base plate 220S. The case body 110 is provided with a first through hole 141 in the region closer to the second opening 112 than the end of the electrode body 200 on the second opening 112 side, and the first through hole 141 is sealed by a first sealing member 701.

[0114] In one example of a secondary battery 1, a second through-hole 142 is provided in the case body 110 in a region closer to the first opening 111 than the end of the electrode body 200 on the first opening 111 side, and the second through-hole 142 is sealed by a second sealing member 702. During the manufacture of the secondary battery 1, the first through-hole 141 can be used as an electrolyte injection port, and the second through-hole 142 can be used as an exhaust vent for gas (air) inside the outer casing 100.

[0115] In one example of a secondary battery 1, if D1 is the distance between the first sealing plate 121 and the end of the electrode body 200 on the first sealing plate 121 side, and D2 is the distance between the second sealing plate 122 and the end of the electrode body 200 on the second sealing plate 122 side, then the relationship D2 > D1 holds. Since the space between the electrode body 200 and the sealing plate is larger on the second sealing plate 122 side than on the first sealing plate 121 side, it is preferable to use the first through hole 141 located on the second sealing plate 122 side as the electrolyte injection hole.

[0116] The manufacturing method for the secondary battery 1 comprises the steps of: pouring an electrolyte solution into the outer casing 100 through the first through hole 141; and sealing the first through hole 141 with the first sealing member 701.

[0117] (Effects and Benefits) According to this embodiment of the secondary battery 1, the secondary battery 1 can be manufactured efficiently, and the ability to inject electrolyte can be improved. For example, by arranging the secondary battery 1 with the longitudinal direction of the outer casing 100 horizontally, the ability to inject electrolyte into the outer casing 100 can be improved. As a result, the secondary battery 1 can be manufactured more efficiently and stably.

[0118] While embodiments of the present technology have been described above, the embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of the present technology is defined by the claims, and all modifications within the meaning and scope equivalent to the claims are intended to be included. [Explanation of Symbols]

[0119] 1 Secondary battery, 100 Outer casing, 110 Case body, 110A, 131A, 310A, 313, 320A Joint, 110Y First wall, 110Z Second wall, 111 First opening, 112 Second opening, 121 First sealing plate, 122 Second sealing plate, 131 Negative electrode terminal, 132 Positive electrode terminal, 141 First through hole, 142 Second through hole, 151, 152 Gas discharge valve, 200, 201, 202 Electrode body, 200t1 End on the first sealing plate side, 200t2 End on the second sealing plate side, 210 Negative electrode plate, 210A Negative electrode tab group, 210B Negative electrode tab, 210S Negative electrode base plate, 211 Negative electrode core, 212 Negative electrode active material layer, 220 Positive electrode plate, 220A Positive electrode tab group, 220B Positive electrode tab, 220S Positive electrode base plate, 221 Positive electrode core, 222 Positive electrode active material layer, 223 Positive electrode protective layer, 300 Current collector, 310 Negative electrode current collector, 311 First conductive member, 312 Second conductive member, 320 Positive electrode current collector, 410 Insulating member, 510, 510A, 510B, 510C, 510D Spacers, 510h1, 510h, 510h3, 510h2 Openings, 511 First spacer, 512 Second spacer, 600 Insulating sheet, 701 First sealing member, 702 Second sealing member.

Claims

1. An electrode body including a first electrode, a second electrode having a polarity different from that of the first electrode, and a separator disposed between the first electrode and the second electrode, The electrode body and the outer casing containing the electrolyte, Equipped with, The exterior body is, A case body having a first opening at one end and a second opening at the other end, A first sealing plate that seals the first opening, The invention includes a second sealing plate that seals the second opening, The first sealing plate is provided with a first electrode terminal that is electrically connected to the first electrode. The second sealing plate is provided with a second electrode terminal that is electrically connected to the second electrode. One end of the electrode body is provided with a group of first electrode tabs electrically connected to the first electrode. The other end of the electrode body is provided with a group of second electrode tabs electrically connected to the second electrode. The second electrode tab group is curved such that it has a region that extends in a direction along the second sealing plate. The case body is provided with a first through hole in a region on the second opening side of the electrode body, The first through hole is sealed by the first sealing member. The first through-hole is an injection hole, When the second electrode tab group is viewed from the injection hole, the second electrode tab group is bent to avoid the injection hole. Secondary battery.

2. In the case body, a second through hole is provided in a region closer to the first opening than the first opening end of the electrode body. The second through hole is sealed by the second sealing member. The second through-hole is an injection hole or an exhaust hole during injection. The secondary battery according to claim 1.

3. Let D1 be the distance between the first sealing plate and the end of the electrode body on the side of the first sealing plate. If D2 is the distance between the second sealing plate and the end of the electrode body on the side of the second sealing plate, then the relationship D2 > D1 holds. A secondary battery according to claim 1 or claim 2.

4. The device comprises a conductive member that electrically connects the second electrode and the second electrode terminal, The conductive member is arranged along the second sealing plate, The region in which the second electrode tab group extends along the second sealing plate is connected to the conductive member. The second electrode tab group is curved such that a gap exists between the region of the second electrode tab group that extends along the second sealing plate and the portion of the second electrode tab group that faces the region of the second electrode tab group that extends along the second sealing plate. The secondary battery according to claim 1.

5. An electrode body including a first electrode, a second electrode having a polarity different from that of the first electrode, and a separator disposed between the first electrode and the second electrode, The electrode body and the outer casing containing the electrolyte, Equipped with, The exterior body is, A case body having a first opening at one end and a second opening at the other end, A first sealing plate that seals the first opening, The invention includes a second sealing plate that seals the second opening, The first sealing plate is provided with a first electrode terminal that is electrically connected to the first electrode. The second sealing plate is provided with a second electrode terminal that is electrically connected to the second electrode. One end of the electrode body is provided with a group of first electrode tabs electrically connected to the first electrode. The other end of the electrode body is provided with a group of second electrode tabs electrically connected to the second electrode. The second electrode tab group is curved such that it has a region that extends in a direction along the second sealing plate. The case body is provided with a first through hole in a region on the second opening side of the electrode body, The first through hole is sealed by the first sealing member. A method for manufacturing a secondary battery, wherein, when viewed from the first through-hole, the second electrode tab group is bent to avoid the first through-hole, When the second electrode tab group is viewed from the first through-hole, the second electrode tab group is bent to avoid the first through-hole, and the process involves pouring the electrolyte into the outer casing from the first through-hole. A step of sealing the first through hole with the first sealing member, A method for manufacturing a secondary battery, comprising the features described above.

6. An electrode body including a first electrode, a second electrode having a polarity different from that of the first electrode, and a separator disposed between the first electrode and the second electrode, The electrode body and the outer casing containing the electrolyte, Equipped with, The exterior body is, A case body having a first opening at one end and a second opening at the other end, A first sealing plate that seals the first opening, The invention includes a second sealing plate that seals the second opening, The first sealing plate is provided with a first electrode terminal that is electrically connected to the first electrode. The second sealing plate is provided with a second electrode terminal that is electrically connected to the second electrode. One end of the electrode body is provided with a group of first electrode tabs electrically connected to the first electrode. The other end of the electrode body is provided with a group of second electrode tabs electrically connected to the second electrode. The case body is provided with an injection hole in a region on the second opening side of the electrode body, A spacer is placed between the second sealing plate and the electrode body. The aforementioned spacer includes a first spacer and a second spacer, each consisting of a separate component. The second electrode tab group is positioned between the first spacer and the second spacer. The first spacer and the second spacer are engaged, The first spacer and the second spacer each have a through hole on the surface of the case body facing the surface on which the liquid injection hole is provided. The injection hole is sealed by the first sealing member. Secondary battery.

7. An electrode body including a first electrode, a second electrode having a polarity different from that of the first electrode, and a separator disposed between the first electrode and the second electrode, The electrode body and the outer casing containing the electrolyte, Equipped with, The exterior body is, A case body having a first opening at one end and a second opening at the other end, A first sealing plate that seals the first opening, The invention includes a second sealing plate that seals the second opening, The first sealing plate is provided with a first electrode terminal that is electrically connected to the first electrode. The second sealing plate is provided with a second electrode terminal that is electrically connected to the second electrode. One end of the electrode body is provided with a group of first electrode tabs electrically connected to the first electrode. The other end of the electrode body is provided with a group of second electrode tabs electrically connected to the second electrode. The case body is provided with a first through hole in a region on the second opening side of the electrode body, The first through hole is sealed by the first sealing member. Let D1 be the distance between the first sealing plate and the end of the electrode body on the side of the first sealing plate. If D2 is the distance between the second sealing plate and the end of the electrode body on the second sealing plate side, then the relationship is D2 > D1. The first through-hole is an injection hole. Secondary battery.

8. A spacer is placed between the first sealing plate and the electrode body. The secondary battery according to claim 6.

9. An electrode body including a first electrode, a second electrode having a polarity different from that of the first electrode, and a separator disposed between the first electrode and the second electrode, The electrode body and the outer casing containing the electrolyte, Equipped with, The exterior body is, A case body having a first opening at one end and a second opening at the other end, A first sealing plate that seals the first opening, The invention includes a second sealing plate that seals the second opening, The first sealing plate is provided with a first electrode terminal that is electrically connected to the first electrode. The second sealing plate is provided with a second electrode terminal that is electrically connected to the second electrode. One end of the electrode body is provided with a group of first electrode tabs electrically connected to the first electrode. The other end of the electrode body is provided with a group of second electrode tabs electrically connected to the second electrode. The case body is provided with a first through hole in a region on the second opening side of the electrode body, A spacer is placed between the second sealing plate and the electrode body. The aforementioned spacer includes a first spacer and a second spacer, which are separate components. The second electrode tab group is positioned between the first spacer and the second spacer. The first spacer and the second spacer are engaged, The first spacer and the second spacer each have a through hole on the surface of the case body facing the surface on which the liquid injection hole is provided. The first spacer and the second spacer are, The first wall is positioned in a direction along the second sealing plate and facing the electrode body, and the second wall extends from the end of the first wall toward the second sealing plate. A space is provided between the first wall and the second sealing plate. The second wall has a through hole, The first through hole is sealed by the first sealing member. The first through-hole is an injection hole. Secondary battery.

Images