battery

Abstract

The present application provides a battery capable of inhibiting generation of partial discharge between an electrode body and an outer body. An insulating sheet includes a bottom surface portion, a first side surface portion, a second side surface portion, a first left side sheet portion, a second left side sheet portion, a left side bottom sheet portion, a first left side connecting portion, and a second left side connecting portion. A first communication path is formed in the insulating sheet by the first left side sheet portion, the second left side sheet portion, the left side bottom sheet portion, the first left side connecting portion, and the second left side connecting portion, the first communication path having a first open end at a position of an end portion of each of the first left side connecting portion and the second left side connecting portion on a side of an opening portion of the outer body, and communicating an inner side and an outer side of the insulating sheet. The first communication path is located on a shortest immersion path of electrolyte from the outer side of the insulating sheet to an end portion (20e) of the electrode body closest to a bottom portion side of the outer body and to a ridge line portion of one side of a pair of second side walls (104a, 104b).

Description

Technical Field

[0001] This technology relates to batteries. Background Technology

[0002] Japanese Patent Application Publication No. 2019-29218 discloses the structure of an energy storage device. The energy storage device described in Japanese Patent Application Publication No. 2019-29218 includes an electrode body, an insulating retainer, and an outer casing. The insulating retainer houses the electrode body. The outer casing houses the electrode body together with the insulating retainer and the electrolyte. The insulating retainer is formed by bending an insulating sheet. The insulating sheet is composed of multiple sheet elements divided by multiple folds and gaps.

[0003] When a short circuit path with a high voltage is formed between two batteries at the ends of a series of batteries due to water immersion around the battery, a high voltage may be applied between the electrode body and the outer casing inside the battery located in the short circuit path. This may damage the insulation between the electrode body and the outer casing through the gap formed by the gap of the insulating sheet and cause partial discharge. Summary of the Invention

[0004] This technology was developed to solve the above problems, and its purpose is to provide a battery that can suppress the generation of partial discharge between the electrode body and the outer casing.

[0005] The battery based on this technology includes an electrode body, a metal outer casing, a sealing plate, and an insulating sheet. The electrode body has a positive electrode plate and a negative electrode plate. The outer casing has an opening through which the electrode body can be inserted and houses the electrode body and electrolyte. The sealing plate seals the opening. The insulating sheet is disposed between the electrode body and the outer casing. The outer casing has a bottom, a pair of first sidewalls, and a pair of second sidewalls. The bottom is opposite to the opening. The pair of first sidewalls are erected from the edges of the bottom and are opposite to each other. The pair of second sidewalls are erected from the edges of the bottom and are opposite to each other, connecting the first sidewalls to each other. The insulating sheet includes a bottom portion, a first side portion, a second side portion, a first left side portion, a second left side portion, a left bottom portion, a first left connecting portion, and a second left connecting portion. The bottom portion is opposite to the bottom. The first side portion is disposed between one of the pair of first sidewalls and the electrode body. The second side portion is disposed between the other of the pair of first sidewalls and the electrode body. A first left-side sheet bends from one side of the first side portion and is disposed between one of the pair of second sidewalls and the electrode body. A second left-side sheet bends from one side of the second side portion and is disposed, at least partially overlapping the first left-side sheet, between one of the pair of second sidewalls and the electrode body. A left-side bottom sheet stands upright from one side of the bottom portion and is located outside the overlapping first and second left-side sheets between one of the pair of second sidewalls and the electrode body. A first left-side connecting portion is continuously disposed with each of the first left-side sheet and the left-side bottom sheet, bent at the respective boundaries of the first left-side sheet and the left-side bottom sheet, and sandwiched between the first left-side sheet and the left-side bottom sheet. A second left-side connecting portion is continuously disposed with each of the second left-side sheet and the left-side bottom sheet, bent at the respective boundaries of the second left-side sheet and the left-side bottom sheet, and sandwiched between the second left-side sheet and the left-side bottom sheet. A first connecting path is formed in the insulating sheet through the first left side portion, the second left side portion, the left bottom portion, the first left connecting portion, and the second left connecting portion. The first connecting path has a first opening end at the end of the outer casing side of each of the first and second left connecting portions, connecting the inner and outer sides of the insulating sheet. The first connecting path is located on the shortest immersion path of the electrolyte from the outer side of the insulating sheet to the end of the electrode body closest to the bottom side of the outer casing and on one side of the ridge portion of the pair of second sidewalls.

[0006] The above and other objects, features, aspects and advantages of the present invention will become clear from the following detailed description relating to the invention, which will be understood in conjunction with the accompanying drawings. Attached Figure Description

[0007] Figure 1 This is a perspective view showing the structure of the battery according to Embodiment 1 of this technology.

[0008] Figure 2 Observe from the direction of the arrow on line II-II Figure 1 A cross-sectional view of the battery.

[0009] Figure 3 This is a perspective view showing the internal structure of a battery other than the outer casing and insulating sheet of the battery in Embodiment 1 of this technology.

[0010] Figure 4 This is a front view showing the original positive electrode plate of the battery according to Embodiment 1 of this technology before the positive electrode plate is formed.

[0011] Figure 5 Observe from the direction of the arrow on the VV line Figure 4 A cross-sectional view of the positive electrode plate.

[0012] Figure 6 This is a front view showing the state of the positive electrode plate of the battery according to Embodiment 1 of this technology after it has been formed.

[0013] Figure 7 This is a front view showing the original negative electrode plate of the battery according to Embodiment 1 of this technology before the negative electrode plate is formed.

[0014] Figure 8 Observe from the direction of the arrow on line VIII-VIII Figure 7 A cross-sectional view of the negative electrode plate.

[0015] Figure 9 This is a front view showing the state of the negative electrode plate of the battery according to Embodiment 1 of this technology after it has been formed.

[0016] Figure 10 This is a perspective view showing the structure of the electrode body and current collector of the battery according to Embodiment 1 of this technology.

[0017] Figure 11 Observing from the direction of the arrow on line XI-XI Figure 10 A cross-sectional view of the electrode body and the current collector.

[0018] Figure 12 This is a cross-sectional view showing the state of the electrode tabs of the battery of Embodiment 1 of this technology after they have been bent.

[0019] Figure 13 This is a top perspective view showing a portion of the current collector and the structure of the sealing plate of the battery according to Embodiment 1 of this technology.

[0020] Figure 14This is a lower perspective view showing a portion of the current collector and the structure of the sealing plate of the battery according to Embodiment 1 of the present technology.

[0021] Figure 15 It is shown in magnification Figure 2 The cross-sectional view of the XV section of the battery shown.

[0022] Figure 16 It is shown in magnification Figure 2 The cross-sectional view of the XVI section of the battery shown.

[0023] Figure 17 This is a perspective view showing the positional relationship between the battery casing and the insulating sheet of the battery according to Embodiment 1 of this technology.

[0024] Figure 18 This is a perspective view showing the structure of a battery other than the outer casing of the battery in Embodiment 1 of this technology.

[0025] Figure 19 It is shown in magnification Figure 18 A perspective view of the XIX section of the battery shown.

[0026] Figure 20 This is a unfolded diagram showing the structure of the insulating sheet included in the battery according to Embodiment 1 of this technology.

[0027] Figure 21 This is a perspective view showing the state of the insulating sheet of the battery according to Embodiment 1 of this technology after it has been bent.

[0028] Figure 22 Observing from the direction of arrow XXII Figure 18 Side view of the battery.

[0029] Figure 23 Observe from the direction of the arrow on line XXIII-XXIII Figure 17 A cross-sectional view of the battery.

[0030] Figure 24 Observing from the direction of arrow XXIV Figure 18 Side view of the battery.

[0031] Figure 25 This is a unfolded diagram showing the structure of the insulating sheet included in the battery according to Embodiment 2 of this technology.

[0032] Figure 26 This is a side view showing the internal structure of the battery according to Embodiment 2 of this technology. Detailed Implementation

[0033] The embodiments of this technology will be described below. Furthermore, the same or equivalent parts are sometimes labeled with the same reference numerals, and their descriptions are not repeated.

[0034] Furthermore, in the embodiments described below, when numbers, quantities, etc., are mentioned, the scope of this technology is not necessarily limited to those numbers, quantities, etc., unless specifically stated otherwise. Additionally, in the embodiments described below, each constituent element is not necessarily essential to this technology, unless specifically stated otherwise.

[0035] Furthermore, in this specification, the terms "comprise," "include," and "have" are open-ended. That is, when a certain structure is included, other structures besides that structure may or may not be included. Additionally, this technology is not necessarily limited to performing all the effects mentioned in this embodiment.

[0036] In this instruction manual, "battery" is not limited to lithium-ion batteries and may include other batteries such as nickel-metal hydride batteries. In this instruction manual, the positive and negative electrodes may be collectively referred to as "electrodes." Additionally, the positive and negative plates may be collectively referred to as "electrode plates."

[0037] In this specification, "energy storage unit" or "energy storage module" is not limited to battery unit or battery module, but may include capacitor unit or capacitor module.

[0038] (Implementation Method 1)

[0039] Figure 1 This is a perspective view showing the structure of the battery according to Embodiment 1 of this technology. Figure 2 Observe from the direction of the arrow on line II-II Figure 1 A cross-sectional view of the battery. Figure 3 This is a perspective view showing the internal structure of a battery other than the outer casing and insulating sheet of the battery in Embodiment 1 of this technology.

[0040] like Figures 1-3 As shown, battery 1 includes a battery casing 10, electrode bodies 20, a positive current collector 30, a negative current collector 40, an insulating sheet 50, a positive external conductive member 60, and a negative external conductive member 70. The battery casing 10 includes an outer body 100 and a sealing plate 110.

[0041] The outer casing 100 is a bottomed cylindrical shape with an opening 101 into which the electrode body 20 can be inserted. The outer casing 100 houses the electrode body 20 and the electrolyte. The outer casing 100 is made of metal. Specifically, the outer casing 100 is made of aluminum, aluminum alloy, iron, or iron alloy.

[0042] The outer body 100 has a bottom 102, a pair of first sidewalls 103a, 103b and a pair of second sidewalls 104a, 104b.

[0043] The bottom 102 is opposite to the opening 101. A pair of first sidewalls 103a and 103b are erected vertically from the edge of the bottom 102 and are parallel to each other. A pair of second sidewalls 104a and 104b are erected vertically from the edge of the bottom 102 and are parallel to each other. Each of the pair of second sidewalls 104a and 104b connects to the first sidewalls 103a and 103b. The area of ​​each of the pair of first sidewalls 103a and 103b is larger than the area of ​​each of the pair of second sidewalls 104a and 104b.

[0044] The sealing plate 110 seals the opening 101 of the outer casing 100. The sealing plate 110 is made of, for example, aluminum, aluminum alloy, iron, or iron alloy.

[0045] An electrolyte injection hole 111 is provided in the sealing plate 110. The electrolyte injection hole 111 is sealed by the sealing member 112. A gas discharge valve 113 is provided in the sealing plate 110. The gas discharge valve 113 breaks when the pressure inside the battery housing 10 reaches a specified value, thereby discharging the gas inside the battery housing 10 to the outside.

[0046] In this embodiment, the electrode body 20 is a flat electrode body having a positive electrode plate and a negative electrode plate, which will be described later. Specifically, the electrode body 20 is a wound electrode body obtained by winding a strip-shaped positive electrode plate and a strip-shaped negative electrode plate together with a strip-shaped spacer (not shown).

[0047] like Figure 2 and Figure 3 As shown, the battery casing 10 houses electrode bodies 20. Specifically, multiple wound electrode bodies are housed inside the insulating sheet 50 disposed within the outer casing 100 of the battery casing 10, along with an electrolyte (not shown). In this embodiment, the battery casing 10 houses three wound electrode bodies. The electrode bodies 20 are housed within the outer casing 100 with their winding axes parallel to the bottom 102. Furthermore, the number of electrode bodies 20 disposed within the outer casing 100 is not limited to three. Additionally, the electrode bodies 20 are not limited to wound electrode bodies; they can also be stacked electrode bodies formed by alternately stacking multiple positive electrode plates and multiple negative electrode plates.

[0048] In the electrode body 20, a tab portion 21 is disposed on at least one of the positive electrode plate and the negative electrode plate, and extends to the side of the electrode body 20. In the electrode body 20 of this embodiment, one of the tab portions 21 has a positive electrode tab assembly 210 containing multiple positive electrode tabs at one end in the direction of extension of the winding axis of the electrode body 20. The other tab portion 21 has a negative electrode tab assembly 260 containing multiple negative electrode tabs at the other end in the direction of extension of the winding axis of the electrode body 20.

[0049] Preferably, the electrode body 20 is disposed within the outer casing 100 with the insulating sheet 50 sandwiched between the two sides, such that one side wall 104a faces the positive electrode tab group 210 and the other side wall 104b faces the negative electrode tab group 260.

[0050] like Figures 1-3 As shown, a positive terminal 230 and a negative terminal 280 are installed on the sealing plate 110. Specifically, as... Figure 2 and Figure 3 As shown, the positive terminal 230 is electrically connected to the positive electrode tabs 210 of each of the plurality of electrode bodies 20 via the positive current collector 30. An external positive conductive member 60 is connected to the positive terminal 230. However, the battery 1 does not necessarily need to include the external positive conductive member 60.

[0051] Each of the positive terminal 230 and the positive external conductive member 60 is preferably made of metal, more preferably of aluminum or aluminum alloy.

[0052] The negative terminal 280 is electrically connected to the negative electrode tabs 260 of each of the plurality of electrode bodies 20 via the negative current collector 40. An external negative conductive member 70 is connected to the negative terminal 280. However, the battery 1 does not necessarily need to include the external negative conductive member 70.

[0053] The negative terminal 280 is preferably made of metal, more preferably of copper or a copper alloy. The external conductive member 70 of the negative terminal is preferably made of metal, more preferably of aluminum or an aluminum alloy. In addition, in the negative terminal 280, the area connected to the negative current collector 40 may be made of copper or a copper alloy, and the area protruding outward compared to the sealing plate 110 may be made of aluminum or an aluminum alloy.

[0054] The positive current collector 30 has a plate-like shape. The positive current collector 30 is connected to one of the tabs 21. In this embodiment, the positive current collector 30 is connected to the positive tab assembly 210. The positive current collector 30 is preferably made of metal, more preferably of aluminum or aluminum alloy.

[0055] In this embodiment, the positive current collector 30 includes a first positive current collector 300 as an extended current collector and a second positive current collector 310 as a current collector.

[0056] The first positive current collector 300 is connected to the positive terminal 230 between the electrode body 20 and the sealing plate 110. The end of the first positive current collector 300 opposite to the side connected to the positive terminal 230 is connected to the second positive current collector 310. The second positive current collector 310 is connected to the positive electrode tab assembly 210 on the side opposite to the side connected to the first positive current collector 300. Alternatively, the positive current collector 30 can be a single component.

[0057] The negative current collector 40 has a plate-like shape. The negative current collector 40 is connected to the other electrode tab 21. In this embodiment, the negative current collector 40 is connected to the negative electrode tab assembly 260. The negative current collector 40 is preferably made of metal, more preferably of copper or a copper alloy.

[0058] The negative current collector 40 in this embodiment includes a first negative current collector 400 as an extended current collector and a second negative current collector 410 as a current collector. The first negative current collector 400 is connected to the negative terminal 280 between the electrode body 20 and the sealing plate 110. The end of the first negative current collector 400 opposite to the side connected to the negative terminal 280 is connected to the second negative current collector 410. The second negative current collector 410 is connected to the negative electrode tab assembly 260 on the side opposite to the side connected to the first negative current collector 400. Alternatively, the negative current collector 40 may be composed of a single component.

[0059] like Figure 2 As shown, an insulating sheet 50 is disposed between the electrode body 20 and the outer casing 100. The insulating sheet 50 is preferably a resin sheet. The material of the insulating sheet 50 is preferably, for example, polypropylene (PP), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyimide (PI), or polyolefin (PO). In particular, the material of the insulating sheet 50 is preferably PP.

[0060] The melting point of the insulating sheet 50 is preferably above 100°C and below 400°C, more preferably above 120°C and below 300°C, and particularly preferably above 150°C and below 170°C.

[0061] The thickness of the insulating sheet 50 is preferably 0.05 mm or more and 1 mm or less, more preferably 0.08 mm or more and 0.5 mm or less, and particularly preferably 0.1 mm or more and 0.2 mm or less.

[0062] The following describes the details of each component of battery 1 and the manufacturing method of battery 1. First, the positive electrode plate will be described.

[0063] Figure 4This is a front view showing the original positive electrode plate of the battery according to Embodiment 1 of this technology before the positive electrode plate is formed. Figure 5 Observe from the direction of the arrow on the VV line Figure 4 A cross-sectional view of the positive electrode plate. Figure 6 This is a front view showing the state of the positive electrode plate of the battery according to Embodiment 1 of this technology after it has been formed.

[0064] The positive electrode plate is manufactured by processing the primary positive electrode plate 200S. For example... Figure 4 and Figure 5 As shown, the positive electrode plate 200S includes a positive electrode core 201, a positive electrode active material layer 202, and a positive electrode protective layer 203. The positive electrode core 201 is an aluminum foil or an aluminum alloy foil.

[0065] Except for one end of both sides, a positive electrode active material layer 202 is formed on the positive electrode core 201. The positive electrode active material layer 202 is formed on the positive electrode core 201 by coating a positive electrode active material layer slurry using a die coating machine.

[0066] A positive electrode active material slurry is prepared by mixing lithium nickel cobalt manganese composite oxide (as the positive electrode active material), polyvinylidene fluoride (PVdF) (as the binder), carbon material (as the conductive material), and N-methyl-2-pyrrolidone (NMP) (as the dispersion medium) in such a way that the mass ratio of lithium nickel cobalt manganese composite oxide:PVdF:carbon material is 97.5:1:1.5.

[0067] The positive electrode protective layer 203 is in contact with the positive electrode core 201 and is formed at one end of the positive electrode active material layer 202 in the width direction. The positive electrode protective layer 203 is formed on the positive electrode core 201 by applying a positive electrode protective layer slurry using a die-coating machine.

[0068] A positive electrode protective layer slurry is prepared by mixing alumina powder, carbon material as a conductive material, PVdF as a binder, and NMP as a dispersion medium in such a mass ratio as alumina powder: carbon material: PVdF of 83:3:14.

[0069] The positive electrode core 201, coated with a positive electrode active material layer slurry and a positive electrode protective layer slurry, is dried, and the NMP contained in the positive electrode active material layer slurry and the positive electrode protective layer slurry is removed. This forms a positive electrode active material layer 202 and a positive electrode protective layer 203. Furthermore, by compressing the positive electrode active material layer 202, a positive electrode substrate 200S comprising the positive electrode core 201, the positive electrode active material layer 202, and the positive electrode protective layer 203 is produced. The positive electrode substrate 200S is cut into a predetermined shape and used as a positive electrode plate. Furthermore, the positive electrode substrate 200S can be cut using laser processing with energy beam irradiation, mold processing, or cutting.

[0070] like Figure 6 As shown, a plurality of positive electrode tabs 220, each composed of a positive electrode core 201, are provided at one end of the positive electrode plate 200 formed from the positive electrode base plate 200S in the width direction. Considering the state in which the plurality of positive electrode tabs 220 are stacked and connected to the positive electrode current collector 30 as a positive electrode tab group 210, the length or width in the protruding direction of each of the plurality of positive electrode tabs 220 is appropriately adjusted according to the position of each of the plurality of positive electrode tabs 220.

[0071] A positive electrode protection layer 203 is provided at the root of each of the multiple positive electrode tabs 220. Alternatively, the positive electrode protection layer 203 may not be provided in the positive electrode tab group 210.

[0072] Next, the negative electrode plate will be explained. Figure 7 This is a front view showing the original negative electrode plate of the battery according to Embodiment 1 of this technology before the negative electrode plate is formed. Figure 8 Observe from the direction of the arrow on line VIII-VIII Figure 7 A cross-sectional view of the negative electrode plate. Figure 9 This is a front view showing the state of the negative electrode plate of the battery according to Embodiment 1 of this technology after it has been formed.

[0073] The negative electrode plate is manufactured by processing the negative electrode primary plate 250S. For example... Figure 7 and Figure 8 As shown, the negative electrode plate 250S includes a negative electrode core 251 and a negative electrode active material layer 252. The negative electrode core 251 is a copper foil or a copper alloy foil.

[0074] Except for one end of both sides, a negative electrode active material layer 252 is formed on the negative electrode core 251. The negative electrode active material layer 252 is formed by coating a negative electrode active material layer slurry using a die-coating machine.

[0075] A negative electrode active material slurry is prepared by mixing graphite (as the negative electrode active material), styrene-butadiene rubber (SBR) and carboxymethyl cellulose (CMC) (as binders), and water (as the dispersion medium) in such a mass ratio as graphite:SBR:CMC of 98:1:1.

[0076] The negative electrode core 251 coated with the negative electrode active material layer slurry is dried, and the water contained in the negative electrode active material layer slurry is removed. This forms the negative electrode active material layer 252. Furthermore, by compressing the negative electrode active material layer 252, a negative electrode substrate 250S comprising the negative electrode core 251 and the negative electrode active material layer 252 is produced. The negative electrode substrate 250S is cut into a predetermined shape and used as the negative electrode plate 250. Furthermore, the negative electrode substrate 250S can be cut using laser processing with energy beam irradiation, mold processing, or cutting.

[0077] like Figure 9 As shown, a plurality of negative electrode tabs 270, each composed of a negative electrode core 251, are provided at one end of the negative electrode plate 250 formed from the negative electrode base plate 250S in the width direction. Considering the state in which the plurality of negative electrode tabs 270 are stacked and connected to the negative electrode current collector 40 as a negative electrode tab group 260, the length or width in the protruding direction of each of the plurality of negative electrode tabs 270 is appropriately adjusted according to the position of each of the plurality of negative electrode tabs 270.

[0078] Next, the electrode body 20, the positive current collector 30, and the negative current collector 40 will be described. Figure 10 This is a perspective view showing the structure of the electrode body and current collector of the battery according to Embodiment 1 of this technology. Figure 10 The image shows the state before the tab 21 is bent.

[0079] like Figure 10 As shown, a flat electrode body 20 is formed by winding a strip-shaped positive electrode plate 200 and a strip-shaped negative electrode plate 250, which are manufactured by the above method, with a strip-shaped spacer (not shown) between them. The spacer preferably has a heat-resistant layer provided on the surface of a polyolefin substrate. This heat-resistant layer comprises ceramic particles and a binder. For example, alumina, boehmite, aluminum hydroxide, or titanium dioxide can be used as the ceramic particles.

[0080] A positive electrode tab assembly 210 is provided at one end of the electrode body 20 on one side in the direction of extension of the winding axis of the electrode body 20. The positive electrode tab assembly 210 includes a plurality of positive electrode tabs 220 disposed on the positive electrode plate 200.

[0081] The thickness of the positive electrode tab 220 is preferably 5 μm or more and 30 μm or less, more preferably 8 μm or more and 20 μm or less. The number of stacked blocks of the positive electrode tab 220 in the positive electrode tab group 210 is preferably 10 or more, more preferably 20 or more, and particularly preferably 30 or more.

[0082] A negative electrode tab assembly 260 is disposed at the other end of the electrode body 20 on the side of the electrode body 20 in the direction of extension of the winding axis. The negative electrode tab assembly 260 includes a plurality of negative electrode tabs 270 disposed on the negative electrode plate 250. In this way, the electrode tab portion 21 is constituted by at least one of the positive electrode tab assembly 210 and the negative electrode tab assembly 260. In this embodiment, the electrode tab portion 21 is constituted by the positive electrode tab assembly 210 and the negative electrode tab assembly 260.

[0083] The thickness of the negative electrode tab 270 is preferably 5 μm or more and 30 μm or less, more preferably 8 μm or more and 20 μm or less. The number of stacked blocks of negative electrode tab 270 in the negative electrode tab group 260 is preferably 10 or more, more preferably 20 or more, and particularly preferably 30 or more.

[0084] The second positive current collector 310 has a first region 311, a second region 312, and a third region 313. For example... Figure 2 As shown, the first region 311 is opposite to one of the second sidewalls 104a. A tab 21 is connected to the first region 311.

[0085] like Figure 2 and Figure 10 As shown, the second region 312 is located on the sealing plate 110 side of the first region 311. The second region 312 is inclined relative to both the first region 311 and the third region 313.

[0086] The third region 313 is located on the side of the sealing plate 110 of the second region 312 and is opposite to the second sidewall 104a of one side. The third region 313 is connected to the first positive current collector 300.

[0087] like Figure 2 As shown, the first region 311 and the third region 313 are configured such that their planar portions are substantially perpendicular to the winding axis of the electrode body 20. Among the opposing second positive current collector 310 and one of the second sidewalls 104a, the shortest distance between the first region 311 and the second sidewall 104a in a direction orthogonal to the second sidewall 104a is shorter than the shortest distance between the third region 313 and the second sidewall 104a.

[0088] like Figure 10 As shown, a recess 314 is provided in the third region 313. The thickness of the portion with the recess 314 is thinner than its surrounding area. A through hole 315 is provided in the recess 314. The third region 313 is connected to the first positive current collector 300 in the recess 314. A fuse hole 316 can be provided in the second positive current collector 310.

[0089] Similar to the second positive current collector 310, the second negative current collector 410 has a first region 411, a second region 412, and a third region 413. A recess 414 and a through hole 415 are provided in the third region 413. The third region 413 is joined to the first negative current collector 400 in the recess 414.

[0090] Next, the connection between the current collector and the tab 21 will be explained. Figure 11 Observing from the direction of the arrow on line XI-XI Figure 10 A cross-sectional view of the electrode body and the current collector. Figure 12 This is a cross-sectional view showing the state of the electrode tabs of the battery of Embodiment 1 of this technology after they have been bent.

[0091] like Figure 11As shown, the first region 311 is joined to the positive electrode tab assembly 210 with the front end 221 of the positive electrode tab assembly 210, which includes multiple positive electrode tabs 220, adjacent to the first region 311 of the second positive electrode current collector 310. This joining forms the tab joint 320. As a joining method between the first region 311 and the positive electrode tab assembly 210, ultrasonic welding, resistance welding, or laser welding can be used.

[0092] like Figure 12 As shown, the positive electrode tab assembly 210, on which the tab engagement portion 320 is formed, is bent by bending. The bent front end portion 221 of the tab portion 21 faces at least one of a pair of second sidewalls 104a, 104b. In this embodiment, the front end portion 221 faces one of the second sidewalls 104a. In this way, the second positive current collector 310 faces the side of the battery housing 10 by bending the positive electrode tab assembly 210. Furthermore, the tab engagement portion 320 may also engage with the surface of the first region 311 opposite to the electrode body 20.

[0093] Similar to the positive electrode tab group 210, the first region 411 of the negative electrode tab group 260 is joined to the negative electrode tab group 260 with the first region 411 of the second negative electrode current collector 410 adjacent to it. This joining forms a tab joint. The negative electrode tab group 260 with the tab joint formed is bent by bending. The bent front end of the tab portion 21 faces at least one of a pair of second sidewalls 104a and 104b. In this embodiment, the front end faces the other second sidewall 104b. In this way, the second negative electrode current collector 410 faces the other second sidewall 104b by bending the negative electrode tab group 260.

[0094] Preferably, the tab engagement portion 320 is disposed on the side of the first region 311 of the second positive current collector 310, near the root of the positive tab assembly 210. With such a structure, a bent shape can be stably formed near the root of the positive tab assembly 210 when it is bent. The position of the negative tab assembly 260 engaging in the first region 411 of the second negative current collector 410 is the same as that of the second positive current collector 310.

[0095] like Figure 2 As shown, preferably, the end of the outer casing 100 of the second positive current collector 310 on the bottom 102 side is located closer to the bottom 102 side than the end of the outer casing 100 of the positive electrode tab assembly 210. With this structure, the positive electrode tab assembly 210 can be bent stably during the bending process. The lower end of the second negative current collector 410 is in the same situation as the second positive current collector 310.

[0096] Next, the sealing plate 110 will be explained. Figure 13 This is a top perspective view showing a portion of the current collector and the structure of the sealing plate of the battery according to Embodiment 1 of this technology. Figure 14 This is a lower perspective view showing a portion of the current collector and the structure of the sealing plate of the battery according to Embodiment 1 of the present technology. Figure 15 It is shown in magnification Figure 2 The cross-sectional view of the XV section of the battery shown. Figure 16 It is shown in magnification Figure 2 The image shows a cross-sectional view of the XVI section of the battery. Figure 13 In the image, a sealing plate 110 is shown from the outside of battery 1. Figure 14 In the middle, the sealing plate 110 is shown from the inside of the battery 1.

[0097] like Figure 13 and Figure 15 As shown, the sealing plate 110 has a positive terminal mounting hole 114 near one end and a negative terminal mounting hole 115 near the other end.

[0098] like Figures 13-15 As shown, in the sealing plate 110, a first external insulating member 231 is arranged around the positive terminal mounting hole 114 on the side opposite to the electrode body 20, and an internal insulating member 240 and a first positive current collector 300 are arranged around the positive terminal mounting hole 114 on the side of the electrode body 20.

[0099] The positive terminal 230 is inserted from the outside of the battery 1 into the through hole 232h of the second external insulating member 232, the positive terminal mounting hole 114 of the sealing plate 110, the through hole 240h of the internal insulating member 240, and the through hole 301h of the first positive current collector 300. The positive terminal 230 is riveted to the first positive current collector 300, forming a riveting portion 230A. Alternatively, after riveting the positive terminal 230, the riveting portion 230A can be welded to the first positive current collector 300.

[0100] like Figure 13 , Figure 14 and Figure 16 As shown, in the sealing plate 110, a first external insulating member 281 is arranged around the negative terminal mounting hole 115 on the side opposite to the electrode body 20, and an internal insulating member 290 and a first negative current collector 400 are arranged around the negative terminal mounting hole 115 on the side of the electrode body 20.

[0101] The negative terminal 280 is inserted from the outside of the battery 1 into the through hole 282h of the second external insulating member 282, the negative terminal mounting hole 115 of the sealing plate 110, the through hole 290h of the internal insulating member 290, and the through hole 401h of the first negative current collector 400. The negative terminal 280 is riveted to the first negative current collector 400, forming a riveting portion 280A. Alternatively, after riveting the negative terminal 280, the riveting portion 280A can be welded to the first negative current collector 400.

[0102] Furthermore, the timing of connecting the positive terminal 230 to the positive external conductive member 60 or the negative terminal 280 to the negative external conductive member 70 is not particularly limited. This connection can be made either after the positive terminal 230 and the negative terminal 280 are fixed to the sealing plate 110, or after the electrolyte injection hole 111 of the sealing plate 110 connected to the outer casing 100 is sealed.

[0103] like Figures 13-15 As shown, the first positive current collector 300, which serves as an extended current collector, has an L-shape in cross-section. The first positive current collector 300 has a base 301 and a current collector connection portion 302. The base 301 is disposed along the sealing plate 110 between the electrode body 20 and the sealing plate 110 via an internal side insulating member 240.

[0104] The current collector connection portion 302 bends from the end of the base portion 301 and extends toward the bottom 102. The current collector connection portion 302 is connected to the third region 313 of the second positive current collector 310. The current collector connection portion 302 is disposed between the second sidewall 104a of one side of the outer casing 100 and the electrode body 20.

[0105] like Figure 13 , Figure 14 and Figure 16 As shown, the first negative current collector 400, which serves as an extended current collector, has an L-shape in cross-section. The first negative current collector 400 has a base 401 and a current collector connecting portion 402. The base 401 is disposed between the electrode body 20 and the sealing plate 110 via an internal side insulating member 290 along the sealing plate 110.

[0106] The current collector connection portion 402 bends from the end of the base portion 401 and extends toward the bottom 102. The current collector connection portion 402 is connected to the third region 413 of the second negative current collector 410. The current collector connection portion 402 is disposed between the second sidewall 104b of the outer casing 100 and the electrode body 20.

[0107] Next, the connection between the first and second current collectors will be explained. For example... Figure 3As shown, the three electrode bodies 20, on which the second positive current collector 310 and the second negative current collector 410 are installed, are arranged in a configuration. At this time, the positive electrode tabs 210 of each of the three electrode bodies 20 are arranged on the same side, and the negative electrode tabs 260 are also arranged on the same side.

[0108] With each of the positive electrode tabs 210 of the three electrode bodies 20 bent, the second positive current collector 310 mounted on the three electrode bodies 20 is joined to the current collector connection portion 302 of the first positive current collector 300 fixed to the sealing plate 110. As a result, the joint between the current collector connection portion 302 and the third region 313 is formed in the recess 314.

[0109] With each of the negative electrode tabs 260 of the three electrode bodies 20 bent, the second negative current collector 410 mounted on the three electrode bodies 20 is joined to the current collector connection portion 402 of the first negative current collector 400 fixed to the sealing plate 110. Thus, the joint between the current collector connection portion 402 and the third region 413 is formed within the recess 414.

[0110] As a method for connecting the first positive current collector 300 and the second positive current collector 310 or the first negative current collector 400 and the second negative current collector 410, ultrasonic welding, resistance welding, or laser welding using high-energy rays can be used. In particular, laser welding is preferred.

[0111] Next, the insertion of the electrode body 20 into the outer casing 100 will be described. For example... Figure 2 As shown, an electrode body 20 is disposed within an insulating sheet 50, which is configured as a bag or box. The electrode body 20 covered by the insulating sheet 50 is inserted into the outer casing 100. Thus, multiple wound-type electrode bodies are housed within the battery casing 10. Next, a sealing plate 110 is joined to the opening 101 of the outer casing 100 by means of laser welding or the like.

[0112] Next, a non-aqueous electrolyte is injected through the electrolyte injection hole 111 provided on the sealing plate 110, and the electrolyte injection hole 111 is sealed by the sealing member 112. Thus, the battery 1 is completed. In addition, the materials used for the positive electrode plate 200, negative electrode plate 250, spacer, electrolyte and each mechanical component used in the battery 1 of this embodiment can be known materials.

[0113] The structure of the insulating sheet 50 in Embodiment 1 of this technology will be described in detail below.

[0114] Figure 17 This is a perspective view showing the positional relationship between the battery casing and the insulating sheet of the battery according to Embodiment 1 of this technology. Figure 18This is a perspective view showing the structure of a battery other than the outer casing of the battery in Embodiment 1 of this technology.

[0115] like Figure 17 and Figure 18 As shown, the insulating sheet 50 includes a bottom part 500, a first side part 510, a second side part 511, a first left side part 520, a second left side part 521, a left bottom part 522, a first left connecting part 523, and a second left connecting part 524.

[0116] The bottom surface 500 is disposed between the electrode body 20 and the bottom 102 of the outer body 100. The bottom surface 500 is opposite to the bottom 102.

[0117] The first side portion 510 is disposed between one of the pair of first sidewalls 103a and 103b and the electrode body 20. In this embodiment, the first side portion 510 is disposed between one of the first sidewalls 103a and the electrode body 20.

[0118] The second side portion 511 is disposed between the other of the pair of first sidewalls 103a, 103b and the electrode body 20. In this embodiment, the second side portion 511 is disposed between the other first sidewall 103b and the electrode body 20.

[0119] The first left side portion 520 bends from one end of the first side portion 510.

[0120] In this embodiment, the first left side portion 520 bends from the side end of the first side portion 510 on the positive electrode side of the battery 1.

[0121] The first left-side plate 520 is disposed between one of the pair of second sidewalls 104a and 104b and the electrode body 20. In this embodiment, the first left-side plate 520 is disposed between one of the second sidewalls 104a and the electrode body 20.

[0122] The second left side portion 521 bends from one side end of the second side portion 511. In this embodiment, the second left side portion 521 bends from the side end of the second side portion 511 on the positive electrode side of the battery 1.

[0123] At least a portion of the second left-side plate 521 is disposed overlapping the first left-side plate 520 between one of the pair of second sidewalls 104a, 104b and the electrode body 20. In this embodiment, the second left-side plate 521 is disposed between one of the second sidewalls 104a and the electrode body 20.

[0124] The left side plate portion 522 stands upright from one end of the bottom portion portion 500. In this embodiment, the left side plate portion 522 stands upright from the end of the bottom portion portion 500 on the positive electrode side of the battery 1.

[0125] The left bottom plate portion 522 is located on the outer side of one of the pair of second sidewalls 104a and 104b between itself and the electrode body 20, compared to the overlapping first left plate portion 520 and second left plate portion 521. In this embodiment, the left bottom plate portion 522 is located on the side of one of the second sidewalls 104a between itself and the electrode body 20, compared to the side of the first left plate portion 520 and second left plate portion 521 closest to one of the second sidewalls 104a.

[0126] The first left-side connecting portion 523 is continuously disposed with each of the first left-side sheet portion 520 and the left-side back sheet portion 522. The first left-side connecting portion 523 is bent at the respective boundaries of the first left-side sheet portion 520 and the left-side back sheet portion 522, and is sandwiched between the first left-side sheet portion 520 and the left-side back sheet portion 522.

[0127] The second left connecting portion 524 is continuously provided with each of the second left sheet portion 521 and the left bottom sheet portion 522. The second left connecting portion 524 is bent at the respective boundaries of the second left sheet portion 521 and the left bottom sheet portion 522, and is sandwiched between the second left sheet portion 521 and the left bottom sheet portion 522.

[0128] Figure 19 It is shown in magnification Figure 18 A perspective view of the XIX section of the battery shown.

[0129] like Figure 19 As shown, a first connecting path 530 is formed in the insulating sheet 50, connecting the inner and outer sides of the insulating sheet 50. The first connecting path 530 is composed of a first left side sheet portion 520, a second left side sheet portion 521, a left side bottom sheet portion 522, a first left side connecting portion 523, and a second left side connecting portion 524. The first connecting path 530 is formed by bending each of the first left side sheet portion 520, the second left side sheet portion 521, the left side bottom sheet portion 522, the first left side connecting portion 523, and the second left side connecting portion 524 and making them adjacent to each other, allowing electrolyte to flow through the first connecting path 530 to both the inner and outer sides of the insulating sheet 50.

[0130] The first connecting path 530 has a first opening end 531. The first opening end 531 is located at the end of the outer body 100 of the first left connecting portion 523 and the second left connecting portion 524 on the opening 101 side. In this embodiment, the first opening end 531 is located at the end of the outer body 100 of the left substrate portion 522, the first left connecting portion 523 and the second left connecting portion 524 on the opening 101 side.

[0131] Figure 20 This is a unfolded diagram showing the structure of the insulating sheet included in the battery according to Embodiment 1 of this technology.

[0132] like Figure 18 and Figure 20 As shown, an insulating sheet 50 is bent to form a bottomed cylindrical shape. Figure 20 As shown, the bottom part 500 is a rectangular shape with a pair of long sides and a pair of short sides orthogonal to the pair of long sides.

[0133] A first side portion 510 is connected to one of the two long sides of the bottom portion 500. Specifically, the first side portion 510 is continuously connected to the bottom portion 500 along the total length of one of the two long sides of the bottom portion 500.

[0134] A second side portion 511 is connected to one of the two long sides of the bottom portion 500. Specifically, the second side portion 511 is continuously connected to the bottom portion 500 along the total length of the other of the two long sides of the bottom portion 500.

[0135] The bottom surface 500 and the left bottom plate portion 522 are continuously connected along the total length of one of the two short sides of the bottom surface 500.

[0136] The first side face portion 510 and the first left side plate portion 520 are continuously connected along the total length of their boundaries facing the electrode body 20. In this embodiment, the first side face portion 510 and the first left side plate portion 520 are continuously connected along the total length of their boundaries. However, it is also possible that a cut or through hole is formed at the upper end of the first side face portion 510 and the first left side plate portion 520 that does not face the electrode body 20, resulting in a discontinuous portion between the first side face portion 510 and the first left side plate portion 520.

[0137] The second side face portion 511 and the second left side plate portion 521 are continuously connected along the total length of their boundaries facing the electrode body 20. In this embodiment, the second side face portion 511 and the second left side plate portion 521 are continuously connected along the total length of their boundaries. However, it is also possible that a cut or through hole is formed at the upper end of the second side face portion 511 and the second left side plate portion 521 that does not face the electrode body 20, resulting in a discontinuous portion between the second side face portion 511 and the second left side plate portion 521.

[0138] The insulating sheet 50 has a first bend line 551, a second bend line 552, a third bend line 553, a fourth bend line 554, a fifth bend line 555, a sixth bend line 556, a seventh bend line 557, an eighth bend line 558 and a ninth bend line 559 formed thereon.

[0139] The first bend line 551 is formed at the boundary between the bottom surface 500 and the first side surface 510. The second bend line 552 is formed at the boundary between the bottom surface 500 and the second side surface 511. The third bend line 553 is formed at the boundary between the first side surface 510 and the first left side panel 520. The fourth bend line 554 is formed at the boundary between one of the two short sides of the bottom surface 500 and the left bottom panel 522. The fifth bend line 555 is formed at the boundary between the second side surface 511 and the second left side panel 521. The sixth bend line 556 is formed at the boundary between the first left side panel 520 and the first left connecting portion 523. The seventh bend line 557 is formed at the boundary between the left bottom panel 522 and the first left connecting portion 523. The eighth bend line 558 is formed at the boundary between the left bottom panel 522 and the second left connecting portion 524. The ninth bend line 559 is formed at the boundary between the second left side panel 521 and the second left connecting portion 524.

[0140] The first bend line 551, the second bend line 552, the third bend line 553, the fourth bend line 554, the fifth bend line 555, the seventh bend line 557, and the eighth bend line 558 are each formed recessed from one side of the insulating sheet 50. The sixth bend line 556 and the ninth bend line 559 are each formed recessed from the other side of the insulating sheet 50. This allows the left bottom sheet portion 522 to be positioned further outward than the first left bottom sheet portion 520 and the second left bottom sheet portion 521.

[0141] The insulating sheet 50 also includes a first intersection point 540 and a second intersection point 541. The first intersection point 540 is the intersection of the first bend line 551, the third bend line 553, the fourth bend line 554, the sixth bend line 556, and the seventh bend line 557. The second intersection point 541 is the intersection of the second bend line 552, the fourth bend line 554, the fifth bend line 555, the eighth bend line 558, and the ninth bend line 559. The first intersection point 540 and the second intersection point 541 are located at the corner of one of the two short sides of the bottom surface 500.

[0142] Figure 21 This is a perspective view showing the state of the insulating sheet of the battery according to Embodiment 1 of this technology after it has been bent.

[0143] like Figure 21As shown, the insulating sheet 50 is formed into a bottomed cylindrical shape by bending the first side portion 510, the second side portion 511, the first left side piece portion 520, the second left side piece portion 521, the left bottom piece portion 522, the first left connecting portion 523, and the second left connecting portion 524 at the first to ninth bending lines 551 to 559 relative to the bottom portion 500.

[0144] Specifically, the first left side panel 520 is bent so that it comes to the outside of the second left side panel 521. The first left side panel 520 and the first left side connecting portion 523 are bent so that they are sandwiched between the left bottom panel 522 and the second left side connecting portion 524. Thus, as Figure 19 As shown, the insulating sheet 50 forms a first connecting path 530 by folding the first left side sheet portion 520, the second left side sheet portion 521, the left bottom sheet portion 522, the first left side connecting portion 523, and the second left side connecting portion 524 together. The first connecting path 530 is a gap that connects the inner and outer sides of the insulating sheet 50.

[0145] Figure 22 Observing from the direction of arrow XXII Figure 18 A side view of the battery. (As shown) Figure 22 As shown, the insulating sheet 50 also has a first overlapping region 571, a second overlapping region 572, a third overlapping region 573 and a fourth overlapping region 574.

[0146] The first overlapping region 571 is the area where the first left-side plate portion 520 and the second left-side plate portion 521 overlap with each other between one of the pair of second sidewalls 104a and 104b and the electrode body 20. In this embodiment, the first overlapping region 571 is located between one of the second sidewalls 104a and the electrode body 20.

[0147] The second overlapping region 572 is the area where the first left side sheet portion 520, the second left side sheet portion 521, and the left bottom sheet portion 522 overlap. In this embodiment, in addition to the first left side sheet portion 520, the second left side sheet portion 521, and the left bottom sheet portion 522, the first left side connecting portion 523 and the second left side connecting portion 524 also overlap in the second overlapping region 572.

[0148] The third overlapping area 573 is the area where the first left side sheet 520, the left side bottom sheet 522, and the first left side connecting part 523 overlap. The fourth overlapping area 574 is the area where the second left side sheet 521, the left side bottom sheet 522, and the second left side connecting part 524 overlap.

[0149] The first opening end 531 is located at the end of the outer body 100 of the third overlapping region 573 and the fourth overlapping region 574 on the side of the opening 101. In this embodiment, the first opening end 531 is located at the end of the second overlapping region 572, the third overlapping region 573 and the fourth overlapping region 574 on the side of the opening 101.

[0150] In a direction orthogonal to the bottom surface 500, the shortest distance L between the bottom surface 500 and the first opening end 531 is 5 mm or more. With this structure, the creepage distance between the short side end (end 20e, described later) of the bottom surface of the electrode body 20 and the outer casing 100 can be ensured to be 5 mm or more. In the insulating sheet 50 of this embodiment, since there are no portions within a radius of 5 mm or less between the inner and outer sides of the insulating sheet 50 at the first intersection 540 and the second intersection 541, the creepage distance between the short side end (end 20e, described later) of the bottom surface of the electrode body 20 and the outer casing 100 can be ensured to be 5 mm or more.

[0151] Figure 23 Observe from the direction of the arrow on line XXIII-XXIII Figure 17 A cross-sectional view of the battery. Figure 23 The image shows a cross-section perpendicular to the bottom surface 500 at the location where the sixth bend line 556 and the ninth bend line 559 intersect.

[0152] like Figure 23 As shown, the insulating sheet 50 has a second left side sheet portion 521, a second left side connecting portion 524, a first left side sheet portion 520, a first left side connecting portion 523 and a left side bottom sheet portion 522 arranged sequentially from the electrode body 20 toward the outer body 100 around the corner of the bottom 102 side.

[0153] The first connecting path 530 is located on the shortest immersion path of the electrolyte from the outside of the insulating sheet 50 to the end of the electrode body 20 of the ridge portion 104e of one of the two second sidewalls 104a and 104b, which is closest to the bottom 102 side of the outer casing 100. In this embodiment, the first connecting path 530 is located on the shortest immersion path of the electrolyte 80 from the outside of the insulating sheet 50 to the end 20e of the electrode body 20 of the ridge portion 104e of one of the second sidewalls 104a, which is closest to the bottom 102 side of the outer casing 100.

[0154] Sometimes, due to water immersion around the battery 1, a short circuit path may be formed, applying a high voltage to the batteries 1 at both ends of a series-connected battery 1. In this case, the highest voltage is applied between the end 20e of the electrode body 20 and the ridge portion 104e of the outer casing 100 inside the battery 1 located in the short circuit path. In the battery 1 of this embodiment, by placing the first connecting path 530 on the shortest immersion path of the electrolyte 80 from the outside of the insulating sheet 50 to the end 20e of the electrode body 20, even when a high voltage is applied between the end 20e of the electrode body 20 and the ridge portion 104e of the outer casing 100, the creepage distance between the end 20e of the electrode body 20 and the ridge portion 104e of the outer casing 100 can be ensured. Therefore, the generation of partial discharge between the end 20e of the electrode body 20 and the ridge portion 104e of the outer casing 100 can be suppressed.

[0155] Figure 24 Observing from the direction of arrow XXIV Figure 18 A side view of the battery. (As shown) Figure 17 , Figure 20 and Figure 24 As shown, the insulating sheet 50 includes a first right side sheet portion 525, a second right side sheet portion 526, a right side bottom sheet portion 527, a first right side connecting portion 528, and a second right side connecting portion 529.

[0156] The first right side portion 525 bends from the end opposite to the side of the first side portion 510. In this embodiment, the first right side portion 525 bends from the end opposite to the side of the first side portion 510 on the negative electrode side of the battery 1.

[0157] The first right-side plate 525 is disposed between the other of the pair of second sidewalls 104a and 104b and the electrode body 20. In this embodiment, the first right-side plate 525 is disposed between the other second sidewall 104b and the electrode body 20.

[0158] The second right side plate 526 bends from the end opposite to the side of the second side plate 511. In this embodiment, the second right side plate 526 bends from the end opposite to the side of the second side plate 511 on the negative electrode side of the battery 1.

[0159] At least a portion of the second right side plate 526 is disposed overlapping the first right side plate 525 between the other of the pair of second sidewalls 104a, 104b and the electrode body 20. In this embodiment, the second right side plate 526 is disposed between the other second sidewall 104b and the electrode body 20.

[0160] The right side plate portion 527 stands upright from the other end of the bottom portion 500. In this embodiment, the right side plate portion 527 stands upright from the end of the bottom portion 500 on the negative electrode side of the battery 1.

[0161] The right bottom film portion 527 is located at a position outside the first right side film portion 525 and the second right side film portion 526 that overlap each other between the other one of the pair of second side walls 104a and 104b and the electrode body 20. In the present embodiment, the right bottom film portion 527 is located at a position closer to the other second side wall 104b than the first right side film portion 525 and the second right side film portion 526 between the other second side wall 104b and the electrode body 20.

[0162] The first right side connecting portion 528 is continuously provided with each of the first right side film portion 525 and the right bottom film portion 527. The first right side connecting portion 528 is bent at the boundaries with the first right side film portion 525 and the right bottom film portion 527, and is sandwiched between the first right side film portion 525 and the right bottom film portion 527.

[0163] The second right side connecting portion 529 is continuously provided with each of the second right side film portion 526 and the right bottom film portion 527. The second right side connecting portion 529 is bent at the boundaries with the second right side film portion 526 and the right bottom film portion 527, and is sandwiched between the second right side film portion 526 and the right bottom film portion 527.

[0164] A tenth bending line 560, an eleventh bending line 561, a twelfth bending line 562, a thirteenth bending line 563, a fourteenth bending line 564, a fifteenth bending line 565, and a sixteenth bending line 566 are formed on the insulating sheet 50.

[0165] The tenth bending line 560 is formed at the boundary between the first side surface portion 510 and the first right side film portion 525. The eleventh bending line 561 is formed at the boundary between the other one of the pair of short sides of the bottom surface portion 500 and the right bottom film portion 527. The twelfth bending line 562 is formed at the boundary between the second side surface portion 511 and the second right side film portion 526. The thirteenth bending line 563 is formed at the boundary between the first right side film portion 525 and the first right side connecting portion 528. The fourteenth bending line 564 is formed at the boundary between the right bottom film portion 527 and the first right side connecting portion 528. The fifteenth bending line is formed at the boundary between the right bottom film portion 527 and the second right side connecting portion 529. The sixteenth bending line 566 is formed at the boundary between the second right side film portion 526 and the second right side connecting portion 529.

[0166] A second connecting path 532 is formed in the insulating sheet 50, connecting the inner and outer sides of the insulating sheet 50. The second connecting path 532 is composed of a first right side sheet portion 525, a second right side sheet portion 526, a right side bottom sheet portion 527, a first right side connecting portion 528, and a second right side connecting portion 529. The first connecting path 530 is formed by bending each of the first right side sheet portion 525, the second right side sheet portion 526, the right side bottom sheet portion 527, the first right side connecting portion 528, and the second right side connecting portion 529 and making them adjacent to each other. Electrolyte can flow through the second connecting path 532 to the inner and outer sides of the insulating sheet 50.

[0167] The second connecting path 532 has a second opening end 533. The second opening end 533 is located at the end of the outer body 100 of the first right connecting portion 528 and the second right connecting portion 529 on the opening 101 side. In this embodiment, the second opening end 533 is located at the end of the outer body 100 of the right bottom portion 527, the first right connecting portion 528 and the second right connecting portion 529 on the opening 101 side.

[0168] The insulating sheet 50 also has a fifth overlapping region 575, a sixth overlapping region 576, a seventh overlapping region 577 and an eighth overlapping region 578.

[0169] The fifth overlapping region 575 is the region where the first right side portion 525 and the second right side portion 526 overlap with each other between the other of the pair of second sidewalls 104a and 104b and the electrode body 20. In this embodiment, the fifth overlapping region 575 is located between the other second sidewall 104b and the electrode body 20.

[0170] The sixth overlapping region 576 is the region where the first right side sheet 525, the second right side sheet 526, and the right side bottom sheet 527 overlap. In this embodiment, the sixth overlapping region 576, in addition to the first right side sheet 525, the second right side sheet 526, and the right side bottom sheet 527, also includes the first right side connecting portion 528 and the second right side connecting portion 529.

[0171] The seventh overlapping region 577 is the area where the first right side sheet portion 525, the right side back sheet portion 527, and the first right side connecting portion 528 overlap. The eighth overlapping region 578 is the area where the second right side sheet portion 526, the right side back sheet portion 527, and the second right side connecting portion 529 overlap.

[0172] The second opening end 533 is located at the end of the outer body 100 of the seventh overlapping region 577 and the eighth overlapping region 578 on the side of the opening 101. In this embodiment, the second opening end 533 is located at the end of the sixth overlapping region 576, the seventh overlapping region 577 and the eighth overlapping region 578 on the side of the opening 101.

[0173] The insulating sheet 50 also includes a third intersection point 542 and a fourth intersection point 543. The third intersection point 542 is the intersection of the first bend line 551, the tenth bend line 560, the eleventh bend line 561, the thirteenth bend line 563, and the fourteenth bend line 564. The fourth intersection point 543 is the intersection of the second bend line 552, the eleventh bend line 561, the twelfth bend line 562, the fifteenth bend line 565, and the sixteenth bend line 566. The third intersection point 542 and the fourth intersection point 543 are located at the corners of one of the two short sides of the bottom surface 500.

[0174] The second connecting path 532 is located on the shortest immersion path of the electrolyte 80 from the outside of the insulating sheet 50 to the end of the electrode body 20 closest to the bottom 102 side of the outer casing 100 and the other side of the ridge portion of the pair of second sidewalls 104a, 104b. In this embodiment, the second connecting path 532 is located on the shortest immersion path of the electrolyte 80 from the outside of the insulating sheet 50 to the end of the electrode body 20 closest to the bottom 102 side of the outer casing 100 and the other side of the ridge portion of the second sidewall 104b.

[0175] The first right side sheet portion 525, the second right side sheet portion 526, the right side bottom sheet portion 527, the first right side connecting portion 528 and the second right side connecting portion 529, and the tenth to sixteenth bend lines 560 to 566 in the insulating sheet 50 have the same structure as the first left side sheet portion 520, the second left side sheet portion 521, the left side bottom sheet portion 522, the first left side connecting portion 523 and the second left side connecting portion 524, and the third to ninth bend lines 553 to 559, except for the structure described above.

[0176] In the battery 1 of this embodiment, by placing the first communication path 530 provided on the insulating sheet 50 on the shortest immersion path of the electrolyte 80 from the outside of the insulating sheet 50 to the end of the electrode body 20 on the ridge portion of one of the pair of second sidewalls 104a, 104b closest to the bottom 102 side of the outer casing 100, even when a high voltage is applied between the end of the electrode body 20 and the ridge portion of the outer casing 100, the creepage distance between the end of the electrode body 20 and the ridge portion of the outer casing 100 can be ensured. Therefore, the generation of partial discharge between the end of the electrode body 20 and the ridge portion of the outer casing 100 can be suppressed.

[0177] In the battery 1 of this embodiment, by making the shortest distance between the bottom surface 500 and the first opening end 531 5 mm or more in the direction orthogonal to the bottom surface 500, the generation of partial discharge between the end 20e of the electrode body 20 and the ridge portion 104e of the outer casing 100 can be suppressed. Furthermore, the aforementioned shortest distance is not limited to 5 mm and can be appropriately set according to the creepage distance required corresponding to the voltage of the battery 1.

[0178] In the battery 1 of this embodiment, by making the shortest distance between the first region 311 and the second sidewall 104a in a direction orthogonal to one sidewall 104a shorter than the shortest distance between the third region 313 and the second sidewall 104a, the insulation distance between the electrode body 20 and the outer casing 100 can be ensured to be longer at a position close to the opening end of the box-shaped insulating sheet 50. Since the first region 411, the third region 413, and the other sidewall 104b also have the same structure as the first region 311, the third region 313, and the second sidewall 104a, the same effect can be obtained.

[0179] In the battery 1 of this embodiment, the tab 21 is connected to the positive terminal 230 or the negative terminal 280 by using two components such as the first positive current collector 300 and the second positive current collector 310 or the first negative current collector 400 and the second negative current collector 410, thereby making it easy to form an electrical connection path with the electrode body 20 of the battery casing 10.

[0180] In the battery 1 of this embodiment, by accommodating multiple wound electrode bodies inside the insulating sheet 50 disposed in the battery housing 10, compared with the case of accommodating a single thick wound electrode body, the bending radius of the end of the bottom part 500 side of the electrode body 20 can be reduced, thereby ensuring that the area where the electrolyte 80 can be immersed in the electrode body 20 is larger. Therefore, it is possible to suppress the insufficient electrolyte 80 in the electrode body 20.

[0181] In the battery 1 of this embodiment, by making the first side portion 510 and the bottom portion 500 continuously connected along the total length of one of the pair of long sides of the bottom portion 500 of the insulating sheet 50, and by making the second side portion 511 continuously connected along the total length of the other of the pair of long sides of the bottom portion 500, the electrode body 20 can be continuously insulated from the outer casing 100 in each of the first bend line 551 and the second bend line 552, thereby suppressing the generation of partial discharge.

[0182] In the battery 1 of this embodiment, by continuously connecting the bottom part 500 and the left bottom part 522 along the total length of one of the short sides of the bottom part 500 of the insulating sheet 50, the electrode body 20 can be continuously insulated from the outer body 100 in the fourth bend line 554, thereby suppressing the generation of partial discharge.

[0183] In the battery 1 of this embodiment, by making the first side portion 510 and the first left side portion 520 continuously connected along the total length of the range facing the electrode body 20 in the boundary between the first side portion 510 and the first left side portion 520 of the insulating sheet 50, and by making the second side portion 511 and the second left side portion 521 continuously connected along the total length of the range facing the electrode body 20 in the boundary between the second side portion 511 and the second left side portion 521, the generation of partial discharge can be suppressed by continuously insulating the electrode body 20 from the outer casing 100 in each of the third bend line 553 and the fifth bend line 555.

[0184] In the battery 1 of this embodiment, by forming the first bending line 551, the second bending line 552, the third bending line 553, the fourth bending line 554, the fifth bending line 555, the seventh bending line 557 and the eighth bending line 558 respectively from one side of the insulating sheet 50, and forming the sixth bending line 556 and the ninth bending line 559 respectively from the other side of the insulating sheet 50, the recessed side can be set as the valley side of the bend. Therefore, the insulating sheet 50 can be easily bent into a box shape.

[0185] In the battery 1 of this embodiment, by placing the second communication path 532 provided on the bent insulating sheet 50 on the shortest immersion path of the electrolyte 80 from the outside of the insulating sheet 50 to the end of the electrode body 20 on the side closest to the bottom 102 of the outer casing 100 and the other side of the pair of second sidewalls 104a, 104b, the creepage distance between the end of the electrode body 20 and the edge portion of the outer casing 100 can be ensured. Therefore, the generation of partial discharge between the end of the electrode body 20 and the edge portion of the outer casing 100 can be suppressed.

[0186] (Implementation Method 2)

[0187] The battery of Embodiment 2 of this technology will now be described. Since the structure of the insulating sheet of the battery of Embodiment 2 of this technology is different from that of the battery 1 of Embodiment 1 of this technology, the same structure as that of the battery 1 of Embodiment 1 of this technology will not be described again.

[0188] Figure 25 This is a developed view showing the structure of the insulating sheet included in the battery according to Embodiment 2 of this technology. Figure 25 As shown, the insulating sheet 50A of the battery in this embodiment includes a bottom part 500, a first side part 510, a second side part 511, a first left side part 520, a second left side part 521, a left bottom part 522, a first left connecting part 523A, and a second left connecting part 524A.

[0189] The first left-side connecting portion 523A is continuously provided with each of the first left-side sheet portion 520 and the left-side back sheet portion 522. The second left-side connecting portion 524A is continuously provided with each of the second left-side sheet portion 521 and the left-side back sheet portion 522.

[0190] The insulating sheet 50A has a first bend line 551, a second bend line 552, a third bend line 553, a fourth bend line 554, a fifth bend line 555, a sixth bend line 556A, a seventh bend line 557A, an eighth bend line 558A, and a ninth bend line 559A.

[0191] The sixth bend line 556A is formed at the boundary between the first left side plate portion 520 and the first left side connecting portion 523A. The sixth bend line 556A includes the short side portion on the side of the first left side connecting portion 523A in the first left side plate portion 520.

[0192] The seventh fold line 557A is formed at the boundary between the left side film portion 522 and the first left side connecting portion 523A. The seventh fold line 557A includes the short side portion on the side of the first left side connecting portion 523A in the left side film portion 522.

[0193] The eighth bend line 558A is formed at the boundary between the left side film portion 522 and the second left side connecting portion 524A. The eighth bend line 558A includes the short side portion on the side of the second left side connecting portion 524A in the left side film portion 522.

[0194] The ninth bend line 559A is formed at the boundary between the second left side plate portion 521 and the second left side connecting portion 524A. The ninth bend line 559A includes the short side portion on the side of the second left side connecting portion 524A in the second left side plate portion 521.

[0195] In the insulating sheet 50A, a first through-cut portion 523h is formed in the region sandwiched between the sixth bend line 556A and the seventh bend line 557A and adjacent to the first left-side connecting portion 523A. A second through-cut portion 524h is formed in the region sandwiched between the eighth bend line 558 and the ninth bend line 559 and adjacent to the second left-side connecting portion 524A. Furthermore, the first through-cut portion 523h and the second through-cut portion 524h are not limited to a cut shape, and may also be a slit, a through hole, or a perforation, etc., that allows communication between the inner and outer sides of the insulating sheet 50.

[0196] The first bend line 551, the second bend line 552, the third bend line 553, the fourth bend line 554, the fifth bend line 555, the seventh bend line 557A, and the eighth bend line 558A are each formed recessed from one side of the insulating sheet 50. The sixth bend line 556A and the ninth bend line 559A are each formed recessed from the other side of the insulating sheet 50. This allows the left bottom sheet portion 522 to be positioned further outward than the first left bottom sheet portion 520 and the second left bottom sheet portion 521.

[0197] Figure 26 This is a side view showing the internal structure of the battery according to Embodiment 2 of this technology. Figure 26 As shown, the first left-side connecting portion 523A is bent at the respective boundaries of the first left-side sheet portion 520 and the left-side back sheet portion 522, and is sandwiched between the first left-side sheet portion 520 and the left-side back sheet portion 522. The second left-side connecting portion 524A is bent at the respective boundaries of the second left-side sheet portion 521 and the left-side back sheet portion 522, and is sandwiched between the second left-side sheet portion 521 and the left-side back sheet portion 522.

[0198] A first connecting path 530A is formed in the insulating sheet 50A, connecting the inner and outer sides of the insulating sheet 50A. The first connecting path 530A is composed of a first left side sheet portion 520, a second left side sheet portion 521, a left side bottom sheet portion 522, a first left side connecting portion 523A, and a second left side connecting portion 524A. The first connecting path 530A is formed by bending each of the first left side sheet portion 520, the second left side sheet portion 521, the left side bottom sheet portion 522, the first left side connecting portion 523A, and the second left side connecting portion 524A and making them adjacent to each other, allowing electrolyte to flow through the first connecting path 530A to both the inner and outer sides of the insulating sheet 50A.

[0199] The first connecting path 530A has a first opening end 531A. The first opening end 531A is located in the first connecting path 530A at the end of the opening 101 side of the outer body 100 of the first left connecting portion 523A and the second left connecting portion 524A, respectively.

[0200] The insulating sheet 50A also has a first overlapping region 571, a second overlapping region 572A, a third overlapping region 573A, a fourth overlapping region 574A, a ninth overlapping region 579 and a tenth overlapping region 580.

[0201] The first overlapping region 571 is the area where the first left-side sheet portion 520 and the second left-side sheet portion 521 overlap. The second overlapping region 572A is the area where the first left-side sheet portion 520, the second left-side sheet portion 521, and the left-side bottom sheet portion 522 overlap. The third overlapping region 573 is the area where the first left-side sheet portion 520, the left-side bottom sheet portion 522, and the first left-side connecting portion 523A overlap. The fourth overlapping region 574 is the area where the second left-side sheet portion 521, the left-side bottom sheet portion 522, and the second left-side connecting portion 524A overlap.

[0202] The ninth overlapping region 579 is the region where the first left side sheet 520 and the left side bottom sheet 522 overlap. The tenth overlapping region 580 is the region where the second left side sheet 521 and the left side bottom sheet 522 overlap.

[0203] The first opening end 531A is located at the end of the outer casing 100 on the opening 101 side of each of the third overlapping region 573A and the fourth overlapping region 574A. For example... Figure 26 As shown, in this embodiment, the first opening end 531A is located on the side of the bottom surface 500, which is closer to the position where the sixth bend line 556A and the ninth bend line 559A intersect.

[0204] When the width dimension of the pair of first sidewalls 103a and 103b of the electrode body 20 in the direction of their opposing orientation is defined as W, and the height dimension from the bottom surface 500 to the first opening end 531A in the direction orthogonal to the bottom surface 500 is defined as H, the width dimension W and the height dimension H satisfy the relationship H < W / 2. According to this relationship, the first opening end 531A is close to the end of the bottom surface 500 side of the electrode body 20.

[0205] Furthermore, the first right side sheet portion 525, the second right side sheet portion 526, the right side bottom sheet portion 527, the first right side connecting portion 528A and the second right side connecting portion 529A, as well as the tenth to twelfth bend lines 560 to 562 and the thirteenth to sixteenth bend lines 563A to 566A in the insulating sheet 50A of this embodiment have the same structure as the first left side sheet portion 520, the second left side sheet portion 521, the left side bottom sheet portion 522, the first left side connecting portion 523A and the second left side connecting portion 524A, as well as the third to fifth bend lines 553 to 555 and the sixth to ninth bend lines 556A to 559A.

[0206] In the battery of this embodiment, by forming a first through cut-out portion 523h and a second through cut-out portion 524h on the insulating sheet 50A, compared with the case where the first through cut-out portion 523h and the second through cut-out portion 524h are not formed in the direction orthogonal to the bottom surface portion 500, the first opening end 531A of the first connecting path 530A is located near the bottom surface portion 500. Therefore, the generation of partial discharge between the end portion 20e of the electrode body 20 and the ridge portion 104e of the outer body 100 can be suppressed, and the electrolyte can be easily immersed from the outside of the insulating sheet 50 to the inside.

[0207] In the battery 1 of this embodiment, by ensuring that the width W of the pair of first sidewalls 103a and 103b of the electrode body 20 facing each other and the height H of the electrode body 20 from the bottom surface 500 to the first opening end 531A in a direction orthogonal to the bottom surface 500 satisfy the relationship H < W / 2, the first opening end 531A can be brought close to the end of the electrode body 20 on the bottom surface 500 side. Therefore, even if the electrolyte on the outside of the insulating sheet 50 is small, the electrolyte can be allowed to penetrate into the inside of the insulating sheet 50. Furthermore, in this embodiment, in the direction orthogonal to the bottom surface 500, it is preferable that the shortest distance between the bottom surface 500 and the first opening end 531A is 5 mm or more.

[0208] Embodiments of the present invention have been described, but it should be considered that the embodiments disclosed herein are illustrative in all respects and not restrictive. The scope of the invention is set forth in the claims and is intended to include all modifications of the meaning and scope equivalent to the claims.

Claims

1. A battery, wherein, The battery has the following features: An electrode body having a positive electrode plate and a negative electrode plate; A metal outer casing having an opening for inserting the electrode body and accommodating the electrode body and electrolyte; A sealing plate that seals the opening; as well as An insulating sheet is disposed between the electrode body and the outer casing. The outer casing has: a bottom, which is opposite to the opening; A pair of first sidewalls, the pair of first sidewalls being erected from the edge of the bottom and facing each other; And a pair of second sidewalls, which are erected from the edge of the bottom and opposite each other, connecting the first sidewalls to each other. The insulating sheet includes: The bottom surface portion is opposite to the bottom portion; A first side surface portion, the first side surface portion being disposed between one of the pair of first sidewalls and the electrode body; A second side portion is disposed between the other of the pair of first sidewalls and the electrode body; The first left side plate is bent from one end of the first side side plate and disposed between one of the pair of second sidewalls and the electrode body. The second left side plate bends from one end of the second side plate and is disposed between one of the pair of second sidewalls and the electrode body, with at least a portion overlapping the first left side plate. The left bottom plate portion stands up from one end of the side of the bottom surface portion and is located on the outer side of one of the pair of second sidewalls and the electrode body, which is more outer than the overlapping first left plate portion and second left plate portion. A first left-side connecting portion, which is continuously disposed with each of the first left-side sheet portion and the left-side bottom sheet portion, is bent at the respective boundaries of the first left-side sheet portion and the left-side bottom sheet portion, and is sandwiched between the first left-side sheet portion and the left-side bottom sheet portion; and The second left-side connecting portion is continuously disposed with each of the second left-side sheet portion and the left-side bottom sheet portion, and is bent at the respective boundaries of the second left-side sheet portion and the left-side bottom sheet portion, and is sandwiched between the second left-side sheet portion and the left-side bottom sheet portion. A first connecting path is formed through the first left side sheet, the second left side sheet, the left bottom sheet, the first left connecting portion, and the second left connecting portion. The first connecting path has a first opening end at the end of the opening side of the outer body of each of the first left connecting portion and the second left connecting portion, and connects the inner side and the outer side of the insulating sheet. The first connection path is located on the shortest immersion path of the electrolyte from the outside of the insulating sheet to the end of the electrode body closest to the bottom side of the outer casing and on one side of the ridge portion of the pair of second sidewalls. The insulating sheet is formed into a bottomed cylindrical shape by being bent. The bottom surface is a rectangular shape having a pair of long sides and a pair of short sides orthogonal to the pair of long sides. One of the pair of long sides of the bottom surface is connected to the first side surface, and a first bend line is formed at the boundary between the bottom surface and the first side surface. The second side face is connected to one of the two long sides of the bottom surface, and a second bend line is formed at the boundary between the bottom surface and the second side face. A third bend line is formed at the boundary between the first side surface and the first left side plate. A fourth bend line is formed between one of the pair of short sides of the bottom surface and the boundary of the left bottom plate portion. A fifth bend line is formed at the boundary between the second side surface and the second left side panel. A sixth bend line is formed at the boundary between the first left-side plate and the first left-side connecting portion. A seventh bend line is formed at the boundary between the left-side substrate portion and the first left-side connecting portion. An eighth bend line is formed at the boundary between the left-side substrate portion and the second left-side connecting portion. A ninth bend line is formed at the boundary between the second left-side plate and the second left-side connecting portion. The insulating sheet has the following characteristics between one of the pair of second sidewalls and the electrode body: a first overlapping region where the first left-side sheet portion and the second left-side sheet portion overlap; a second overlapping region where the first left-side sheet portion, the second left-side sheet portion, and the left-side bottom sheet portion overlap; a third overlapping region where the first left-side sheet portion, the left-side bottom sheet portion, and the first left-side connecting portion overlap; and a fourth overlapping region where the second left-side sheet portion, the left-side bottom sheet portion, and the second left-side connecting portion overlap. The first opening end is located at the end of the opening portion of the outer body in both the third overlapping region and the fourth overlapping region. The battery also features: A tab, wherein the tab is disposed on at least one of the positive electrode plate and the negative electrode plate, and extends to the side of the electrode body; and A current collector, which is connected to the electrode tab. The current collector has: a first region, which is opposite to the second sidewall; a second region, which is located on the sealing plate side of the first region; and a third region, which is located on the sealing plate side of the second region and is opposite to the second sidewall. The electrode portion is connected to the first region. In the opposing current collectors and the second sidewall, the shortest distance between the first region and the second sidewall in a direction orthogonal to the second sidewall is shorter than the shortest distance between the third region and the second sidewall.

2. The battery according to claim 1, wherein, In a direction orthogonal to the bottom surface, the shortest distance between the bottom surface and the first opening end is 5 mm or more.

3. The battery according to claim 2, wherein, In the insulating sheet, A first through cut-off portion is formed in the region sandwiched between the sixth and seventh bend lines and adjacent to the first left-side connecting portion. A second through cut is formed in the region sandwiched between the eighth bend line and the ninth bend line and adjacent to the second left connecting portion.

4. The battery according to claim 3, wherein, The electrode body is a wound electrode body formed by winding the positive electrode plate and the negative electrode plate together. When the width dimension of the pair of first sidewalls of the electrode body in the direction in which they face each other is set as W, and the height dimension from the bottom surface to the first opening end in the direction orthogonal to the bottom surface is set as H, The width dimension W and the height dimension H satisfy the relationship H < W / 2.

5. The battery according to claim 1, wherein, The battery also includes an extended current collector connected to the current collector. The extended current collector has a base disposed between the electrode body and the sealing plate, and a current collector connecting portion extending from the end of the base toward the bottom. The current collector connection is connected to the third region.

6. The battery according to claim 4, wherein, A plurality of the wound electrode bodies are housed inside the insulating sheet disposed within the outer casing.

7. The battery according to any one of claims 2 to 6, wherein, The first side surface portion and the bottom surface portion are continuously connected along the total length of one of the pair of long sides of the bottom surface portion. The second side portion is continuously connected to the bottom portion along the total length of the other of the pair of long sides of the bottom portion.

8. The battery according to any one of claims 2 to 6, wherein, The bottom surface portion and the left bottom portion are continuously connected along the total length of one of the pair of short sides of the bottom surface portion.

9. The battery according to any one of claims 2 to 6, wherein, The first side portion and the first left side portion are continuously connected along the total length of the area facing the electrode body within the boundary of the first side portion and the first left side portion. The second side portion and the second left side portion are continuously connected along the total length of the area facing the electrode body within the boundary of the second side portion and the second left side portion.

10. The battery according to any one of claims 2 to 6, wherein, The first bend line, the second bend line, the third bend line, the fourth bend line, the fifth bend line, the seventh bend line, and the eighth bend line are respectively formed recessed from one side of the insulating sheet. The sixth bend and the ninth bend are respectively formed recessed from the other side of the insulating sheet.

11. The battery according to any one of claims 2 to 6, wherein, The insulating sheet includes: The first right side plate is bent from the other end of the first side side plate and disposed between the other side of the pair of second sidewalls and the electrode body; The second right side plate bends from the other end of the second side plate and is disposed, at least partially overlapping the first right side plate, between the other side of the pair of second sidewalls and the electrode body. The right side plate portion stands up from the other end of the side of the bottom surface portion, and is located on the outer side of the other side of the pair of second sidewalls and the electrode body, which is more outer than the overlapping first right side plate portion and the second right side plate portion. A first right-side connecting portion, which is continuously disposed with each of the first right-side sheet portion and the right-side bottom sheet portion, is bent at the respective boundaries of the first right-side sheet portion and the right-side bottom sheet portion, and is sandwiched between the first right-side sheet portion and the right-side bottom sheet portion; and The second right-side connecting portion is continuously disposed with each of the second right-side sheet portion and the right-side bottom sheet portion, and is bent at the respective boundaries of the second right-side sheet portion and the right-side bottom sheet portion, and is sandwiched between the second right-side sheet portion and the right-side bottom sheet portion. A second communication path is formed through the first right side sheet, the second right side sheet, the right side bottom sheet, the first right side connecting portion, and the second right side connecting portion. The second communication path has a second opening end at the end of the opening side of the outer body of each of the first right side connecting portion and the second right side connecting portion, and communicates the inner side and the outer side of the insulating sheet. The second connection path is located on the shortest immersion path of the electrolyte from the outside of the insulating sheet to the end of the electrode body closest to the bottom side of the outer casing and the ridge portion of the other side of the pair of second sidewalls.

12. The battery according to claim 11, wherein, A tenth bend line is formed at the boundary between the first side surface and the first right side plate. An eleventh bend line is formed between the other of the pair of short sides on the bottom surface and the boundary of the right side of the bottom plate. A twelfth bend line is formed at the boundary between the second side surface and the second right side plate. A thirteenth bend line is formed at the boundary between the first right side portion and the first right side connecting portion. A fourteenth bend line is formed at the boundary between the right-side substrate portion and the first right-side connecting portion. A fifteenth bend line is formed at the boundary between the right-side substrate portion and the second right-side connecting portion. A sixteenth bend line is formed at the boundary between the second right side portion and the second right side connecting portion. The insulating sheet has the following characteristics between the other of the pair of second sidewalls and the electrode body: a fifth overlapping region where the first right sidesheet portion and the second right sidesheet portion overlap; a sixth overlapping region where the first right sidesheet portion, the second right sidesheet portion, and the right bottom sheet portion overlap; a seventh overlapping region where the first right sidesheet portion, the right bottom sheet portion, and the first right connecting portion overlap; and an eighth overlapping region where the second right sidesheet portion, the right bottom sheet portion, and the second right connecting portion overlap. The second opening end is located at the end of the opening side of the outer body in the seventh overlapping region and the eighth overlapping region, respectively.

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