Nonaqueous electrolyte battery

Abstract

The problem to be solved by the present invention is to provide a non-aqueous electrolyte battery in which breakage of tabs can be suppressed even if an electrode laminate constituting the non-aqueous electrolyte battery expands due to charging and discharging. Each tab is divided into a portion to which tension is applied when the volume of the electrode laminate expands, and a portion where the tab is bundled (an external electrical connection portion), and the tension applied to the portion where the tab is bundled of each tab is made equal. Specifically, a tab fixing material is disposed between the negative electrode tabs and / or between the positive electrode tabs, thereby suppressing an increase in tension between the negative electrode tab bundling part and / or the positive electrode tab bundling part and the tab fixing material.

Description

Technical Field

[0001] The present invention relates to a non-aqueous electrolyte battery. Background Art

[0002] In recent years, in order to make energy affordable, trustworthy, and to ensure access to sustainable and advanced energy, research and development of secondary batteries that contribute to energy efficiency has been carried out.

[0003] A secondary battery, for example, includes: an electrode laminate formed by laminating a plurality of positive electrodes and a plurality of negative electrodes with an electrolyte layer therebetween; and a packaging material that houses the electrode laminate; and has a positive electrode tab lead and a negative electrode tab lead protruding from the packaging material. The positive electrode tabs extending from the plurality of positive electrodes are bundled and connected to the positive electrode tab lead, and the negative electrode tabs extending from the plurality of negative electrodes are bundled and connected to the negative electrode tab lead.

[0004] Here, the positive electrode tab lead and the negative electrode tab lead are generally disposed substantially at the center in the thickness direction of the lamination direction of the electrode laminate. Therefore, the length of the tab from the electrode plate to the tab lead varies depending on each electrode plate.

[0005] Figure 5 It is a cross-sectional view showing the structure of a prior non-aqueous electrolyte battery of an embodiment. Figure 5 The non-aqueous electrolyte battery 10 shown has an electrode laminate 11, a packaging material 12 that houses the electrode laminate 11, and a positive electrode tab lead 14 and a negative electrode tab lead 17 protruding from the packaging material 12. And, a positive electrode tab bundle portion 13a formed by bundling the positive electrode tabs 13 extending from the plurality of positive electrodes is connected to the positive electrode tab lead 14, and a negative electrode tab bundle portion 16a formed by bundling the negative electrode tabs 16 extending from the plurality of negative electrodes is connected to the negative electrode tab lead 17.

[0006] In Figure 5 In the non-aqueous electrolyte battery 10 shown, the positive electrode tab lead 14 and the negative electrode tab lead 17 protruding from the packaging material 12 are arranged so as to protrude in opposite directions at both ends in the lamination direction of the electrode laminate 11. And, the plurality of positive electrodes are connected to the positive electrode tab lead 14 via the plurality of positive electrode tabs 13, and the plurality of negative electrodes are connected to the negative electrode tab lead 17 via the plurality of negative electrode tabs 16.

[0007] Here, the non-aqueous electrolyte battery expands and contracts with charge and discharge, and the thickness of the electrode laminate due to charging increases. And, when the thickness of the electrode laminate increases, the tension of each tab constituting the non-aqueous electrolyte battery becomes different.

[0008] Specifically, in the case where the electrode laminate expands in volume, the tabs extending from near the uppermost surface and the lowermost surface of the laminate are subjected to a greater tension than the tabs extending from near the central portion. Therefore, the tabs extending from near the uppermost surface and the lowermost surface of the laminate are likely to break (foil disconnection). In particular, in the case of a battery with a large amount of expansion or a hard battery, the tension applied to the tabs tends to increase. In addition, even if the tabs do not break (foil disconnection), damage may be caused to the electrode plates near the tabs, which may lead to a short circuit and performance degradation of the non-aqueous electrolyte battery.

[0009] In response to this, in Patent Document 1, for the purpose of suppressing the non-uniformity of the expansion amount of an all-solid battery using lithium metal as the negative electrode, it is proposed that the "difference between the maximum value and the minimum value of the resistance from the electrode to the collecting portion" of each tab be below a threshold value. As a method for making the resistance difference below the threshold value, it is described that each tab is formed using the same raw material and the lengths are made the same, etc.

[0010] However, the method described in Patent Document 1 makes the tabs in a flexed state in order to make the lengths of the tabs the same to suppress the non-uniformity of the expansion amount of the battery, and suppresses the breakage of the tabs caused by the force in the stretching direction by the flexure of the tabs. Therefore, it does not control the tension of each tab itself.

[0011] [Prior Art Documents]

[0012] (Patent Document)

[0013] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2022-70663 Summary of the Invention

[0014] [Problems to be Solved by the Invention]

[0015] An object of the present invention is to provide a non-aqueous electrolyte battery that can suppress the breakage of tabs even when the electrode laminate constituting the non-aqueous electrolyte battery expands due to charge and discharge.

[0016] [Technical Means for Solving the Problems]

[0017] In order to achieve the above object, the inventor of the present invention has actively explored continuously. And, focusing on the tension applied to the tab wires extending from each electrode plate constituting the electrode laminate, it is considered that making the tensions equal can suppress the breakage of the tab wires. And, it is found that if each tab is divided into a portion that will be subjected to tension when the electrode laminate expands in volume and a portion where the tabs are bundled (the electrical connection portion to the outside), even when the electrode laminate expands in volume, the tension applied to the portion where the tabs are bundled of each tab can be maintained equal, and as a result, the breakage of the tabs can be suppressed, thus completing the present invention.

[0018] That is, the present invention includes the following aspects. [1]

[0020] A non-aqueous electrolyte battery includes: a packaging material; and an electrode laminate formed by laminating a plurality of positive electrodes and a plurality of negative electrodes with an electrolyte layer therebetween and housed in the packaging material; and

[0021] The non-aqueous electrolyte battery has a positive electrode tab lead and a negative electrode tab lead protruding from the packaging material,

[0022] A positive electrode tab extends from the positive electrode, and ends of the plurality of positive electrode tabs are bundled to form a positive electrode tab bundle portion, and the positive electrode tab bundle portion is connected to the positive electrode tab lead,

[0023] A negative electrode tab extends from the negative electrode, and ends of the plurality of negative electrode tabs are bundled to form a negative electrode tab bundle portion, and the negative electrode tab bundle portion is connected to the negative electrode tab lead,

[0024] An ear fixing material for fixing the tabs is disposed between at least one pair of adjacent negative electrode tabs and / or between at least one pair of adjacent positive electrode tabs. [2]

[0026] The non-aqueous electrolyte battery according to aspect [1], wherein a plurality of the ear fixing materials are arranged in the plane direction of the electrode laminate. [3]

[0028] The non-aqueous electrolyte battery according to aspect [1], wherein the ear fixing material is disposed between the negative electrode tabs at both ends in the lamination direction of the electrode laminate and / or between the positive electrode tabs. [4]

[0030] The non-aqueous electrolyte battery according to aspect [1], wherein the ear fixing material is disposed between all pairs of adjacent negative electrode tabs and / or between all pairs of adjacent positive electrode tabs. [5]

[0032] The non-aqueous electrolyte battery according to aspect [1], wherein the ear fixing material is further disposed between at least one negative electrode tab at both ends in the lamination direction of the electrode laminate and the packaging material and / or between at least one positive electrode tab and the packaging material. [6]

[0034] The non-aqueous electrolyte battery according to aspect [1], wherein the ear fixing material is an insulator. [7]

[0036] The non-aqueous electrolyte battery according to Aspect [1], wherein the ear fixing material is frictionally fixed to the negative electrode ear and / or the positive electrode ear. [8]

[0038] The non-aqueous electrolyte battery according to Aspect [1], wherein the surface of the ear fixing material that faces and contacts the negative electrode ear and / or the positive electrode ear is a curved surface. [9]

[0040] The non-aqueous electrolyte battery according to Aspect [1], wherein the negative electrode is a lithium metal negative electrode or a silicon negative electrode.

[0041] The ear fixing material is disposed between at least one pair of adjacent negative electrode ears.

[10]

[0043] The non-aqueous electrolyte battery according to Aspect [1], wherein the non-aqueous electrolyte battery is a solid battery.

[0044] (Effects of the Invention)

[0045] According to the present invention, a non-aqueous electrolyte battery can be provided that can suppress breakage of the ears even when the electrode laminate constituting the non-aqueous electrolyte battery expands due to charge and discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 is a cross-sectional view of the lead wire side end portion of the negative electrode ear of the non-aqueous electrolyte battery according to an embodiment of the present invention.

[0047] Figure 2 is a cross-sectional view of the lead wire side end portion of the negative electrode ear of the non-aqueous electrolyte battery according to a modification of the above embodiment.

[0048] Figure 3 is a cross-sectional view of the lead wire side end portion of the negative electrode ear of the non-aqueous electrolyte battery according to a modification of the above embodiment.

[0049] Figure 4 is a cross-sectional view of the lead wire side end portion of the negative electrode ear of the non-aqueous electrolyte battery according to a modification of the above embodiment.

[0050] Figure 5 is a cross-sectional view showing the structure of a conventional non-aqueous electrolyte battery.

[0051] Hereinafter, embodiments of the present invention will be described with reference to the drawings. DETAILED DESCRIPTION OF THE INVENTION

[0052] <Non-aqueous electrolyte battery>

[0053] The non-aqueous electrolyte battery of the present disclosure includes: a packaging material; and an electrode laminate formed by laminating a plurality of positive electrodes and a plurality of negative electrodes with an electrolyte layer interposed therebetween, and housed in the packaging material. The non-aqueous electrolyte battery of the present disclosure has a positive electrode tab lead and a negative electrode tab lead protruding from the packaging material.

[0054] In the non-aqueous electrolyte battery of the present disclosure, a positive electrode tab extends from the positive electrode, the ends of the plurality of positive electrode tabs are bundled to form a positive electrode tab bundle portion, and the positive electrode tab bundle portion is connected to the positive electrode tab lead. A negative electrode tab extends from the negative electrode, the ends of the plurality of negative electrode tabs are bundled to form a negative electrode tab bundle portion, and the negative electrode tab bundle portion is connected to the negative electrode tab lead.

[0055] Furthermore, in the non-aqueous electrolyte battery of the present disclosure, an ear fixing material is disposed between at least one of adjacent negative electrode tabs and / or between at least one of adjacent positive electrode tabs. By disposing the ear fixing material between the negative electrode tabs and / or between the positive electrode tabs, it is possible to suppress an increase in the tension between the disposed negative electrode tab bundle portion and / or positive electrode tab bundle portion and the ear fixing material. As a result, it is possible to maintain the tension applied to the portion where the tabs are bundled equal for each tab, and it is possible to suppress breakage of the tabs when the electrode laminate expands in volume.

[0056] [Type of non-aqueous electrolyte battery]

[0057] The type of the non-aqueous electrolyte battery of the present disclosure is not particularly limited. The non-aqueous electrolyte battery of the present disclosure may be, for example, a solid battery monomer such as an all-solid-state lithium-ion battery monomer or an all-solid-state lithium metal battery monomer, or a non-aqueous electrolyte battery monomer such as a lithium metal battery monomer. Among these, a solid battery monomer is preferred.

[0058] [Packaging material]

[0059] In the non-aqueous electrolyte battery of the present disclosure, the packaging material may be a packaging material known in the field of non-aqueous electrolyte batteries. As such a packaging material, for example, a metal or a film having a resin layer formed on the surface of a metal layer can be cited. As the metal constituting the metal layer, for example, aluminum can be cited. As the resin constituting the resin layer, for example, polyethylene, polyvinyl fluoride, and polyvinylidene chloride can be cited.

[0060] [Electrode laminate]

[0061] In the non-aqueous electrolyte battery of the present disclosure, the electrode laminate is a laminate formed by laminating a plurality of positive electrodes and a plurality of negative electrodes with an electrolyte layer interposed therebetween, and is housed in the packaging material.

[0062] [Positive electrode]

[0063] In the non-aqueous electrolyte battery of the present disclosure, the positive electrode constituting the electrode laminate is not particularly limited, and a positive electrode known in non-aqueous electrolyte batteries can be used. For example, in the case where the non-aqueous electrolyte battery of the present disclosure is an all-solid-state lithium metal battery, the positive electrode has a laminated structure of a positive electrode current collector and a positive electrode composite material layer, and is arranged such that the positive electrode composite material layer is adjacent to the electrolyte layer.

[0064] In the case where the non-aqueous electrolyte battery of the present disclosure is an all-solid-state lithium metal battery, the positive electrode current collector is not particularly limited, and for example, aluminum foil can be mentioned. In addition, the positive electrode composite material layer contains a positive electrode active material as an essential component, and may optionally contain a solid electrolyte, a conductive aid, a binder, and the like.

[0065] The positive electrode active material is not particularly limited as long as it can occlude and release lithium ions. As the positive electrode active material, for example, LiCoO2, Li(Ni 5 / 10 Co 2 / 10 Mn 3 / 10 )O2, Li(Ni 6 / 10 Co 2 / 10 Mn 2 / 10 )O2, Li(Ni 8 / 10 Co 1 / 10 Mn 1 / 10 )O2, Li(Ni 0.8 Co 0.15 Al 0.05 )O2, Li(Ni 1 / 6 Co 4 / 6 Mn 1 / 6 )O2, Li(Ni 1 / 3 Co 1 / 3 Mn 1 / 3 )O2, LiCoO4, LiMn2O4, LiNiO2, LiFePO4, lithium sulfide, sulfur.

[0066] (Negative electrode)

[0067] In the non-aqueous electrolyte battery of the present disclosure, the negative electrode constituting the electrode laminate is not particularly limited, and a negative electrode known in non-aqueous electrolyte batteries can be used. For example, in the case where the non-aqueous electrolyte battery of the present disclosure is an all-solid-state lithium metal battery, the negative electrode has a laminated structure of a lithium metal layer and a negative electrode current collector, and is arranged such that the lithium metal layer is adjacent to the electrolyte layer. Alternatively, an intermediate layer for homogenizing the dissolution and precipitation of lithium may be disposed between the lithium metal layer and the electrolyte layer.

[0068] In the case where the non-aqueous electrolyte battery of the present disclosure is an all-solid-state lithium metal battery, the negative electrode current collector is not particularly limited, and for example, copper foil can be mentioned.

[0069] (Electrolyte)

[0070] In the non-aqueous electrolyte battery of the present disclosure, the electrolyte constituting the electrode laminate is not particularly limited, and an electrolyte known in non-aqueous electrolyte batteries can be used. As the electrolyte, for example, an electrolytic solution and a solid electrolyte can be cited. In the case of using an electrolytic solution, the electrolytic solution is arranged so as to be held by the separator. For example, in the case where the non-aqueous electrolyte battery of the present disclosure is an all-solid-state lithium metal battery, the electrolyte disposed between the positive electrode and the negative electrode is disposed between the positive electrode composite material layer and the lithium metal layer.

[0071] In the case where the non-aqueous electrolyte battery of the present disclosure is an all-solid-state lithium metal battery, the electrolyte becomes a solid electrolyte layer. The solid electrolyte constituting the solid electrolyte layer is not particularly limited as long as it is a material capable of conducting lithium ions. As the solid electrolyte, for example, an oxide-based electrolyte and a sulfide-based electrolyte can be cited.

[0072] [Positive electrode tab lead, negative electrode tab lead]

[0073] In the non-aqueous electrolyte battery of the present disclosure, the positive electrode tab lead and the negative electrode tab lead protrude from the packaging material.

[0074] (Arrangement of positive electrode tab lead and negative electrode tab lead)

[0075] In the non-aqueous electrolyte battery of the present disclosure, the protruding directions of the positive electrode tab lead and the negative electrode tab lead protruding from the packaging material are not particularly limited. The protruding directions of the positive electrode tab lead and the negative electrode tab lead can be opposite directions, the same direction, or inclined directions. It can be appropriately selected according to the usage environment of the non-aqueous electrolyte battery of the present disclosure and the structure of the module formed by a plurality of non-aqueous electrolyte batteries.

[0076] (Number of positive electrode tab leads and negative electrode tab leads)

[0077] The non-aqueous electrolyte battery of the present disclosure can be a single battery in which positive electrode tab leads and negative electrode tab leads are respectively connected to all the positive electrodes and negative electrodes constituting the electrode laminate, or can be a battery pack in which a laminate unit formed by laminating a positive electrode, an electrolyte, and a negative electrode is divided into a plurality of sub-stacks and positive electrode tab leads and negative electrode tab leads are respectively connected to each sub-stack. In the case where the non-aqueous electrolyte battery of the present disclosure is a single battery, the number of the positive electrode tab lead and the negative electrode tab lead is one each. In the case where the non-aqueous electrolyte battery of the present disclosure is a battery pack, the number of the positive electrode tab lead and the negative electrode tab lead is plural each.

[0078] [Tab fixing material]

[0079] In the non-aqueous electrolyte battery of the present disclosure, an ear fixing material is disposed between at least one of adjacent negative electrode tabs and / or between at least one of adjacent positive electrode tabs. The ear fixing material functions to suppress the movement of the tabs, and with the ear fixing material as the center, the tabs can be divided into a portion where tension is applied when the electrode laminate expands in volume and a portion where the tabs are bundled (connection portion with the tab lead). Since the ear fixing material suppresses the movement of the tabs, even when the volume of the electrode laminate expands, it is possible to suppress the tension from rising due to the stretching of the portion where the tabs are bundled (connection portion with the tab lead) of each tab, so that the tension of each tab can be maintained equal, and breakage of the tabs can be suppressed.

[0080] Figure 1 It is a cross-sectional view of the end portion on the side of the negative electrode tab lead 4 of the non-aqueous electrolyte battery 1 according to an embodiment of the present invention. Figure 1 The non-aqueous electrolyte battery 1 shown is a battery in which an electrode laminate (not shown) is housed in a packaging material 2, and an ear fixing material 5 is disposed between all adjacent negative electrode tabs 3. In the non-aqueous electrolyte battery 1, the ear fixing material 5 is disposed between the positive electrode tab bundling portion 3a connected to the negative electrode tab lead 4 and the electrode laminate (not shown).

[0081] (Shape of the ear fixing material)

[0082] In Figure 1 In the non-aqueous electrolyte battery 1 shown, the ear fixing materials 5 as a plurality of individual fixing materials are each substantially rectangular parallelepiped in shape, but there is no particular limitation as long as it is a shape capable of suppressing the movement of the tabs. As will be described later, in the ear fixing material, the surface facing and contacting the tab may also be formed of a curved surface. Further, for example, it may be one fixing material having a length equal to the length in the thickness direction of the electrode laminate, or may be a plurality of individual fixing materials disposed between adjacent tabs. In the case of using one fixing material, for example, a fixing material having a plurality of recesses is used, and the tabs are arranged such that each tab passes through the recess, and the ear fixing material is clamped by the packaging materials on the upper surface and the lower surface in the thickness direction of the electrode laminate, whereby the ear fixing material can be fixed in the packaging material.

[0083] In Figure 1 In the non-aqueous electrolyte battery 1 shown, the ear fixing materials 5 are a plurality of individual fixing materials, and each ear fixing material 5 is disposed between adjacent negative electrode tabs.

[0084] (Arrangement location of the ear fixing material)

[0085] Regarding the placement location of the tab fixing material, it suffices to be at least one between adjacent negative tabs and / or at least one between adjacent positive tabs, and there is no particular limitation. By arranging it at a portion close to the tab bundling part (the connection part with the tab lead), the length of the tab can be shortened and the battery can be miniaturized, thus contributing to the energy density of the obtained non-aqueous electrolyte battery.

[0086] Generally, in a non-aqueous electrolyte battery, the swelling of the negative electrode is larger than that of the positive electrode. Therefore, by arranging the tab fixing material at least between the negative tabs, the effects of the present invention can be further enjoyed.

[0087] In addition, when arranging a plurality of separate tab fixing materials between adjacent tabs respectively, the tab fixing materials can also be arranged in such a way that the distance from the tab bundling part (the connection part with the tab lead) to the tab fixing material is fixed. If a plurality of tab fixing materials are arranged in such a way that the distance from the tab bundling part (the connection part with the tab lead) to the tab fixing material is fixed, the battery can be further miniaturized, contributing to the energy density of the obtained battery.

[0088] (Material of the tab fixing material)

[0089] The material of the tab fixing material is not particularly limited. It can be an insulator or a conductor, and preferably an insulator. When the tab fixing material is formed of an insulator, during the lamination process of the electrode laminate (the process before tab bundling), it can prevent the backflow between layers during abnormal times and easily ensure process safety.

[0090] (Method of arranging the tab fixing material)

[0091] Regarding the method of arranging the tab fixing material on the negative tab and / or the positive tab, as long as it is a method capable of arranging the tab fixing material, there is no particular limitation. As the method of arranging the tab fixing material on the negative tab and / or the positive tab, for example, welding or soldering on the tab, or friction fixing on the tab can be cited. Among them, friction fixing is preferably adopted. If it is friction fixing, by controlling the friction coefficient of the tab fixing material, the tab fixing material can be fixed to the tab only by the load during tab bundling.

[0092] In addition, the tab fixing material can be arranged simultaneously when coating the positive composite material or the like on the current collector, or can be arranged in any subsequent process.

[0093] (Contact surface of the tab fixing material with the tab)

[0094] The shape of the contact surface of the tab fixing material with the tab, which is a surface that is substantially perpendicular to the stacking direction of the electrode laminate and faces the tab, is not particularly limited. The contact surface of the tab fixing material with the tab can be, for example, a flat surface, a curved surface, or a stepped surface with a step difference.

[0095] Among them, the contact surface of the tab fixing material with the tab, which is a surface that faces and contacts the tab, is preferably a curved surface. By making the surface of the tab fixing material facing the tab a curved surface, the contact area between the tab and the tab fixing material increases, resulting in an increase in frictional force, thereby enabling an increase in the fixing force for fixing the tab.

[0096] When the contact surface of the tab fixing material with the tab is a curved surface, it can be a shape with a gentle curved portion (curve) in the overall shape of the tab fixing material, or it can be a shape with an R given by chamfering the corners of the tab fixing material. When the overall shape of the tab fixing material has a gentle curved portion, for example, the cross-sectional shape of the tab fixing material can be an elliptical shape.

[0097] As described above, the embodiments of the present invention have been described, but the present invention is not limited to the above embodiments, and the above embodiments can be appropriately changed within the scope of the gist of the present invention.

[0098] For example Figures 2 to 4 is a cross-sectional view of the negative tab lead side end of a non-aqueous electrolyte battery that is a variation of the above embodiment. In Figure 2 the variation shown, as the tab fixing material 5, a plurality of tab fixing materials 5a, 5b are arranged and disposed in the plane direction of the electrode laminate 11. Thus, a configuration can also be adopted in which a plurality of tab fixing materials are arranged and disposed in the plane direction of the electrode laminate between at least one of the tabs.

[0099] In addition, in Figure 3 the variation shown, the tab fixing material 5 is disposed between the negative tabs 3 at both ends in the stacking direction of the electrode laminate 11. Thus, a configuration can also be adopted in which it is disposed between the negative tabs and / or between the positive tabs at both ends in the stacking direction of the electrode laminate.

[0100] In addition, in Figure 4 the variation shown, the tab fixing material 5 is disposed not only between all the negative tabs 3 but also between the negative tab 3 at both ends in the stacking direction of the electrode laminate 11 and the packaging material 2. Thus, a configuration can also be adopted in which the tab fixing material is further disposed between at least one negative tab and the packaging material and / or between at least one positive tab and the packaging material at both ends in the stacking direction of the electrode laminate.

[0101] Reference numerals

[0102] 1. 10 Non-aqueous electrolyte battery

[0103] 2. 12 Packaging material

[0104] 3. 13 Negative electrode tab

[0105] 3a. 13a Negative electrode tab bundle part

[0106] 4. 14 Negative electrode tab lead

[0107] 5. Tab fixing material

[0108] 11. Electrode laminate

[0109] 16. Positive electrode tab

[0110] 16a. Positive electrode tab bundle part

[0111] 17. Positive electrode tab lead

Claims

1. A non-aqueous electrolyte battery comprising: a packaging material; and an electrode stack, which is formed by stacking a plurality of positive electrodes and a plurality of negative electrodes with an electrolyte interposed therebetween and is housed in the packaging material; and The nonaqueous electrolyte battery has a positive electrode tab lead and a negative electrode tab lead protruding from the packaging material. A positive electrode tab extends from the positive electrode, and ends of a plurality of the positive electrode tabs are bundled to form a positive electrode tab bundle portion, and the positive electrode tab bundle portion is connected to the positive electrode tab lead. A negative electrode tab extends from the negative electrode, and ends of a plurality of the negative electrode tabs are bundled to form a negative electrode tab bundle portion, and the negative electrode tab bundle portion is connected to the negative electrode tab lead. A tab fixing material for fixing the tabs is disposed between at least one of the adjacent negative electrode tabs and / or between at least one of the adjacent positive electrode tabs.

2. The nonaqueous electrolyte battery according to claim 1, wherein A plurality of the tab fixing members are arranged side by side in the surface direction of the electrode stack.

3. The nonaqueous electrolyte battery according to claim 1, wherein The tab fixing member is disposed between the negative electrode tabs and / or between the positive electrode tabs at both ends of the electrode stack in the stacking direction.

4. The nonaqueous electrolyte battery according to claim 1, wherein The tab fixing member is disposed between all adjacent negative electrode tabs and / or between all adjacent positive electrode tabs.

5. The nonaqueous electrolyte battery according to claim 1, wherein The tab fixing member is further arranged between at least one of the negative electrode tabs and the packaging material and / or between at least one of the positive electrode tabs and the packaging material at both ends of the electrode stack in the stacking direction.

6. The nonaqueous electrolyte battery according to claim 1, wherein The aforementioned tab fixing material is an insulator.

7. The nonaqueous electrolyte battery according to claim 1, wherein The tab fixing material is frictionally fixed to the negative electrode tab and / or the positive electrode tab.

8. The nonaqueous electrolyte battery according to claim 1, wherein The surface of the tab fixing member facing and contacting the negative electrode tab and / or the positive electrode tab is a curved surface.

9. The nonaqueous electrolyte battery according to claim 1, wherein The negative electrode is a lithium metal negative electrode or a silicon negative electrode. The tab fixing member is disposed between at least one of the adjacent negative electrode tabs.

10. The nonaqueous electrolyte battery according to claim 1, wherein The aforementioned nonaqueous electrolyte battery is a solid battery.

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