JP2021111589A - battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stack a plurality of electrode bodies via an insulator, and to insulate some tabs of the plurality of electrode bodies with insulating tabs, while heat-bonding some tabs to each other from the tabs. Suppresses heat transfer to the electrodes. SOLUTION: The electrode body is provided with a plurality of electrode bodies and insulators arranged between the plurality of electrode bodies, the electrode body is provided with an electrode portion, and a positive electrode tab and a negative electrode tab, and the insulator is an electrode. It is provided with a partial insulating portion and an insulating tab, and the thermal conductivity of the insulating tab is higher than the thermal conductivity of the electrode portion insulating portion. When the other electrode body is used as the second electrode body, the positive electrode tab of the first electrode body and the negative electrode tab of the second electrode body are heat-bonded, and the negative electrode tab of the first electrode body and the positive electrode of the second electrode body are joined. A battery in which an insulating tab of an insulator is arranged between the tab and an electrode portion of the insulator is arranged between an electrode portion of the first electrode body and an electrode portion of the second electrode body. [Selection diagram] Fig. 2

Description

The present application discloses a battery.

When connecting a plurality of electrode bodies in series, an insulator may be arranged between the electrode bodies to prevent a short circuit. For example, in the technique disclosed in Patent Document 1, by using a conductive connecting member, an insulating connecting member, and an insulating fixing member in combination, the tabs of the electrode body are connected in series and the tabs of the electrode body are connected. It is compatible with insulation between them. Further, Patent Document 2 discloses a technique of ultrasonically welding a positive electrode tab and a negative electrode tab. Further, Patent Document 3 discloses a technique for forming a connection portion of a battery by using a conductive material such as solder.

Japanese Unexamined Patent Publication No. 2016-136504 Japanese Unexamined Patent Publication No. 2014-167881 JP-A-2017-152415

When a connecting member or a fixing member is used separately as in the technique disclosed in Patent Document 1, the weight and volume of the battery become large. When ultrasonic welding is performed as in the technique disclosed in Patent Document 2, the insulating member may be damaged. By connecting the tabs using a conductive material such as solder as in the technique disclosed in Patent Document 3, it is possible to suppress an increase in the weight and volume of the battery and also to suppress damage to the insulating member. Conceivable. However, when the solder is melted by heating and the tabs are connected, heat is transferred from the tabs to the electrode portion, and the battery performance may be deteriorated.

The present application is one of the means for solving the above problems.
A plurality of electrode bodies and insulators arranged between the plurality of electrode bodies are provided.
The electrode body includes an electrode portion and a positive electrode tab and a negative electrode tab protruding from the electrode portion.
The insulator includes an electrode portion insulating portion and an insulating tab protruding from the electrode portion insulating portion.
The thermal conductivity of the insulating tab is higher than the thermal conductivity of the electrode insulating portion.
When one of the electrode bodies adjacent to each other across the insulator is used as the first electrode body and the other electrode body is used as the second electrode body, the positive electrode tab of the first electrode body and the second electrode body are used. The negative electrode tab of the electrode body is heat-bonded, and the insulating tab of the insulator is arranged between the negative electrode tab of the first electrode body and the positive electrode tab of the second electrode body. The electrode portion insulating portion of the insulator is arranged between the electrode portion and the electrode portion of the second electrode body.
Disclose the battery.

According to the battery of the present disclosure, the positive electrode tab and the negative electrode tab are heat-bonded, and it is not necessary to separately use a connecting member or a fixing member. Further, in the insulator arranged between the electrode bodies, since the insulating tab has a higher thermal conductivity than the electrode portion insulating portion, the tab portion has priority over the electrode portion of the electrode body at the time of heat bonding. It is heated to the surface and can be heat-bonded in a short time, and heat transfer to the electrode portion can be suppressed to suppress deterioration of battery performance.

It is the schematic which shows by disassembling each component of a battery. The tabs indicated by the double-headed arrows are heat-bonded. It is the schematic which shows the laminated structure of the side surface of the battery which the tab protrudes. The tabs indicated by the double-headed arrows are heat-bonded. It is the schematic which shows the appearance of the electrode body. It is the schematic which shows the laminated structure of the side surface of the electrode body in which a tab protrudes. It is the schematic which shows the surface shape of an insulator. It is the schematic which shows the structure of the insulator side part where the insulation tab protrudes. It is the schematic which shows the manufacturing method of a battery.

1. 1. Batteries Figures 1 to 6 schematically show the configuration of the battery 100 of the present disclosure. As shown in FIGS. 1 and 2, the battery 100 includes a plurality of electrode bodies 10 and insulators 20 arranged in each of the plurality of electrode bodies 10. As shown in FIGS. 2 to 4, the electrode body 10 includes an electrode portion 10a, a positive electrode tab 10b and a negative electrode tab 10c protruding from the electrode portion 10a. As shown in FIGS. 2, 5 and 6, the insulator 20 includes an electrode portion insulating portion 20a and an insulating tab 20b protruding from the electrode portion insulating portion 20a. Here, the thermal conductivity of the insulating tab 20b is higher than the thermal conductivity of the electrode portion insulating portion 20a. Further, as shown in FIGS. 1 and 2, in the battery 100, one electrode body 10 adjacent to each other with one insulator 20 interposed therebetween is the first electrode body (X), and the other electrode body 10 is the second electrode body 10. When the electrode body (Y) is used, the positive electrode tab 10b of the first electrode body (X) and the negative electrode tab 10c of the second electrode body (Y) are heat-bonded, and the negative electrode tab 10c of the first electrode body (X) is heat-bonded. The insulating tab 20b of the insulator 20 is arranged between the positive electrode portion 10b of the second electrode body (Y) and the electrode portion 10a of the first electrode body (X) and the electrode portion 10a of the second electrode body (Y). The electrode portion insulating portion 20a of the insulator 20 is arranged between the two.

1.1 Electrode body As shown in FIGS. 2 to 4, the electrode body 10 includes an electrode portion 10a, a positive electrode tab 10b and a negative electrode tab 10c protruding from the electrode portion 10a.

1.1.1 Electrode section An electrochemical reaction is generated in the electrode section 10a to generate electricity. The configuration of the electrode portion 10a may be the same as the conventional one. For example, as shown in FIG. 4, the electrode portion 10a includes a positive electrode current collector 1 having a positive electrode tab 10b, a negative electrode current collector 2 having a negative electrode tab 10c, a positive electrode active material layer 3, a negative electrode active material layer 4, and an electrolyte layer. 5 may be provided.

The positive electrode current collector 1 may be formed of a metal foil, a metal mesh, or the like. From the viewpoint of excellent handleability, the positive electrode current collector 1 may be a metal foil. The positive electrode current collector 1 may be made of a plurality of metal foils. Examples of the metal constituting the positive electrode current collector 1 include Cu, Ni, Cr, Au, Pt, Ag, Al, Fe, Ti, Zn, Co, and stainless steel. The positive electrode current collector 1 may have some kind of coat layer on its surface for the purpose of adjusting resistance or the like. Further, when the positive electrode current collector 1 is composed of a plurality of metal foils, some layer may be provided between the plurality of metal foils. The thickness of the positive electrode current collector 1 is not particularly limited. For example, it may be 0.1 μm or more, 1 μm or more, 1 mm or less, or 100 μm or less.

The negative electrode current collector 2 may be formed of a metal foil, a metal mesh, or the like. From the viewpoint of excellent handleability, the negative electrode current collector 2 may be a metal foil. The negative electrode current collector 2 may be made of a plurality of metal foils. Examples of the metal constituting the negative electrode current collector 2 include Cu, Ni, Cr, Au, Pt, Ag, Al, Fe, Ti, Zn, Co, and stainless steel. The negative electrode current collector 2 and the positive electrode current collector 1 may be made of the same material or may be made of different materials. The negative electrode current collector 2 may have some kind of coat layer on its surface for the purpose of adjusting resistance or the like. Further, when the negative electrode current collector 2 is composed of a plurality of metal foils, some layer may be provided between the plurality of metal foils. The thickness of the negative electrode current collector 2 is not particularly limited. For example, it may be 0.1 μm or more, 1 μm or more, 1 mm or less, or 100 μm or less.

The positive electrode active material layer 3 is a layer containing at least the positive electrode active material. When the battery 100 is a solid-state battery, a solid electrolyte, a binder, a conductive auxiliary agent, and the like can be optionally contained in addition to the positive electrode active material. When the battery 100 is an electrolytic solution-based battery, a binder, a conductive auxiliary agent, and the like can be optionally added in addition to the positive electrode active material. A known active material may be used as the positive electrode active material. Among known active materials, two substances having different potentials (charge / discharge potentials) for storing and releasing predetermined ions are selected, a substance exhibiting a noble potential is used as a positive electrode active material, and a substance exhibiting a low potential is described later. Each can be used as a negative electrode active material. For example, when a lithium ion battery, lithium cobalt oxide as the positive electrode active material, lithium _{nickelate, LiNi 1/3 Co 1/3 Mn 1/3 O} 2, lithium manganate, various such spinel type lithium compound Lithium-containing composite oxides can be used. When the battery 100 is a solid-state battery, the surface of the positive electrode active material may be coated with an oxide layer such as a lithium niobate layer, a lithium titanate layer, or a lithium phosphate layer. When the battery 100 is a solid-state battery, the solid electrolyte may be an inorganic solid electrolyte. Inorganic solid electrolytes have higher ionic conductivity than organic polymer electrolytes. In addition, it has excellent heat resistance as compared with organic polymer electrolytes. Further, it is hard and has excellent rigidity as compared with the organic polymer electrolyte, and the battery 100 can be more easily constructed. Examples of the inorganic solid electrolyte include oxide solid electrolytes such as lithium lanthanozylconate, LiPON, Li _{1 + X} Al _X Ge _2-X (PO ₄ ) ₃ , Li-SiO-based glass, and Li-Al-SO-based glass. Li _{2 SP 2} S ₅ , Li ₂ S-SiS ₂ , LiI-Li ₂ S-SiS ₂ , LiI-Si _{2 SP 2} S ₅ , Li _{2 SP 2} S _5- LiI-LiBr, _{LiI-Li 2 S-P 2} S 5, LiI-Li 2 S-P 2 O 5, LiI-Li 3 PO 4 -P 2 S 5, Li 2 S-P 2 S 5 -GeS 2 sulfides such as solid An electrolyte can be exemplified. In particular, a sulfide solid electrolyte is preferable, and a sulfide solid electrolyte containing _{Li 2} SP ₂ S _{5 is more preferable.} Examples of the binder that can be contained in the positive electrode active material layer 3 include a butadiene rubber (BR) -based binder, a butylene rubber (IIR) -based binder, an acrylate-butadiene rubber (ABR) -based binder, a polyvinylidene fluoride (PVdF) -based binder, and polytetra. Fluoroethylene (PTFE) -based binders and the like can be mentioned. Examples of the conductive auxiliary agent that can be contained in the positive electrode active material layer 3 include carbon materials such as acetylene black and Ketjen black, and metal materials such as nickel, aluminum, and stainless steel. The content of each component in the positive electrode active material layer 3 may be the same as in the conventional case. The shape of the positive electrode active material layer 3 may be the same as the conventional one. In particular, the sheet-shaped positive electrode active material layer 3 is preferable from the viewpoint that the battery 100 can be easily constructed. The thickness of the positive electrode active material layer 3 is not particularly limited. For example, it may be 0.1 μm or more and 2 mm or less. The lower limit may be 1 μm or more, and the upper limit may be 1 mm or less.

The negative electrode active material layer 4 is a layer containing at least the negative electrode active material. When the battery 100 is a solid-state battery, a solid electrolyte, a binder, a conductive auxiliary agent, and the like can be optionally contained in addition to the negative electrode active material. When the battery 100 is an electrolytic solution-based battery, a binder, a conductive auxiliary agent, and the like can be optionally contained in addition to the negative electrode active material. A known active material may be used as the negative electrode active material. For example, in the case of forming a lithium ion battery, as a negative electrode active material, a silicon-based active material such as Si, Si alloy or silicon oxide; a carbon-based active material such as graphite or hard carbon; various oxide-based active materials such as lithium titanate. Material: Metallic lithium, lithium alloy, etc. can be used. The solid electrolyte, the binder and the conductive auxiliary agent can be appropriately selected and used from those exemplified as those used for the positive electrode active material layer 3. The content of each component in the negative electrode active material layer 4 may be the same as in the conventional case. The shape of the negative electrode active material layer 4 may be the same as the conventional one. In particular, the sheet-shaped negative electrode active material layer 4 is preferable from the viewpoint that the battery 100 can be easily constructed. The thickness of the negative electrode active material layer 4 is not particularly limited. For example, it may be 0.1 μm or more and 2 mm or less. The lower limit may be 1 μm or more, and the upper limit may be 1 mm or less.

The electrolyte layer 5 is a layer containing at least an electrolyte. When the battery 100 is a solid-state battery, the electrolyte layer 5 can be a solid electrolyte layer containing a solid electrolyte and optionally a binder. As the solid electrolyte, the above-mentioned inorganic solid electrolyte, particularly a sulfide solid electrolyte, is preferable. The binder can be appropriately selected and used from those exemplified as those used for the positive electrode active material layer 3. The content of each component in the solid electrolyte layer may be the same as before. The shape of the solid electrolyte layer may be the same as the conventional one. In particular, a sheet-shaped solid electrolyte layer is preferable from the viewpoint that the battery 100 can be easily constructed. In this case, the thickness of the solid electrolyte layer may be, for example, 0.1 μm or more and 2 mm or less. The lower limit may be 1 μm or more, and the upper limit may be 1 mm or less. On the other hand, when the battery 100 is an electrolytic solution-based battery, the electrolyte layer 5 may include an electrolytic solution and a separator. A known electrolytic solution or separator may be used.

1.1.2 Positive Electrode Tab The material of the positive electrode tab 10b may be the same as or different from that of the positive electrode current collector 1. The thickness of the positive electrode tab 10b may be the same as or different from the thickness of the positive electrode current collector 1. The positive electrode tab 10b may have a shape protruding from the positive electrode current collector 1. As the protruding shape of the positive electrode tab 10b, various shapes such as a polygonal shape, a semicircular shape, and a linear shape can be adopted. The method of providing the positive electrode tab 10b on the positive electrode current collector 1 is not particularly limited. For example, the positive electrode tab 10b may be formed by cutting out a part of the positive electrode current collector 1, or the positive electrode tab 10b may be joined to the positive electrode current collector 1 by welding or the like.

11.3 Negative electrode tab The material of the negative electrode tab 10c may be the same as or different from that of the negative electrode current collector 2. The thickness of the negative electrode tab 10c may be the same as or different from the thickness of the negative electrode current collector 1. The negative electrode tab 10c may have a shape protruding from the negative electrode current collector 2. As the protruding shape of the negative electrode tab 10c, various shapes such as a polygonal shape, a semicircular shape, and a linear shape can be adopted. The method of providing the negative electrode tab 10c on the negative electrode current collector 2 is not particularly limited. For example, the negative electrode tab 10c may be formed by cutting out a part of the negative electrode current collector 2, or the negative electrode tab 10c may be joined to the negative electrode current collector 2 by welding or the like.

1.1.4 Supplement The electrode body 10 can be manufactured by a known method. In the case of an all-solid-state battery, for example, the active material layer A is laminated on one side of the current collector by a dry or wet method, and the solid electrolyte layer is laminated on one side of the active material layer A by a dry or wet method. The electrode body 10 is obtained by laminating the active material layer B on one surface side of the solid electrolyte layer by a dry method or a wet method, and further laminating a current collector on the one surface side of the active material layer B. The stacking order of each layer is not limited to this.

In FIGS. 1 to 4, negative electrode active material layers 4 and 4 are provided on both surfaces of one negative electrode current collector 2, and electrolyte layers 5 and 5 are provided on each of the negative electrode active material layers 4 and 4, respectively. Although the positive electrode active material layers 3 and 3 are provided in the electrolyte layers 5 and 5 and the positive electrode current collectors 1 and 1 are provided in the respective positive electrode active material layers 3 and 3, the form of the electrode body 10 is It is not limited to this. Even if the positive electrode active material layers 3, 3, the electrolyte layers 5, 5, the negative electrode active material layers 4, 4 and the negative electrode current collectors 2, 2 are sequentially provided on both sides of one positive electrode current collector 1 to form an electrode body. Alternatively, the electrode body may be configured by providing the positive electrode active material layer 3, the solid electrolyte layer 5 and the negative electrode active material layer 4 between one positive electrode current collector layer 1 and one negative electrode current collector 2. .. Alternatively, a bipolar current collector may be provided between the positive electrode current collector layer 1 and the negative electrode current collector 2 to form a bipolar electrode body.

1.2. Insulator As shown in FIGS. 2, 5 and 6, the insulator 20 includes an electrode portion insulating portion 20a and an insulating tab 20b protruding from the electrode portion insulating portion 20a. Here, the thermal conductivity of the insulating tab 20b is higher than the thermal conductivity of the electrode portion insulating portion 20a.

1.2.1 Electrode portion insulating portion The electrode portion insulating portion 20a is arranged between the electrode portions 10a of the electrode body 10 to prevent conduction between the electrode portions 10a. Confining pressure may be applied to the electrode portion 10a, and in this case, the electrode portion insulating portion 20a is required not to be damaged even when a high load is applied. Further, the electrode portion insulating portion 20a may be made of a material having a large thermal resistance in consideration of suppressing heat transfer between the electrode bodies 10. For example, the electrode portion insulating portion 20a can be formed of a resin such as polyethylene terephthalate or polyimide. The shape of the electrode portion insulating portion 20a can be, for example, a sheet shape. The thickness of the electrode portion insulating portion 20a is not particularly limited as long as it is possible to prevent contact and conduction between the electrode portions 10a. For example, the thickness of the electrode portion insulating portion 20a may be 0.1 μm or more and 2 mm or less. The thermal conductivity of the material constituting the electrode portion insulating portion 20a may be, for example, 0.1 W / mK or more and 1.0 W / mK or less.

1.2.2 Insulation tabs The insulation tabs 20b are arranged between the tabs of the electrode body 10 to prevent the tabs 10b and 10c from conducting each other. The insulating tab 20b has an insulating property and is made of a material having a higher thermal conductivity than the electrode portion insulating portion 20a. For example, the insulating tab 20b can be composed of a mixture of a heat conductive filler and a resin. Examples of the heat conductive filler include inorganic oxide particles such as alumina particles. Examples of the resin include polyethylene terephthalate, polyimide and silicone. The insulating tab 20b may project from the electrode portion insulating portion 20a, and the projecting shape may adopt various shapes such as a polygonal shape and a semicircular shape. The shape of the insulating tab 20b may have a shape corresponding to the tabs 10b and 10c so as to prevent the tabs 10b and 10c from conducting each other. Further, the insulating tab 20b may have a larger area than the tabs 10b and 10c. The thickness of the insulating tab 20b may be the same as or different from the thickness of the electrode portion insulating portion 20a. The thickness of the insulating tab 20b may be less than or equal to the thickness of the electrode portion insulating portion 20a. The thermal conductivity of the material constituting the insulating tab 20b may be, for example, more than 1.0 W / mK and 10.0 W / mK or less.

1.2.3 Supplement The insulator 20 can be produced by a known means and method. For example, while the resin is molded into a film to obtain the electrode portion insulating portion 20a, the heat conductive filler-containing resin composition is molded into a tab shape to form an insulating tab 20b, and the insulating tab 20b is adhered to the electrode portion insulating portion 20a. The insulator 20 may be manufactured by welding, or the resin constituting the electrode portion insulating portion 20a and the heat conductive filler-containing resin composition constituting the insulating tab 20b are integrally molded at the same time to prepare the insulator 20. You may.

1.3. Arrangement structure and bonding structure of electrode body and insulator As shown in FIGS. 1 and 2, in the battery 100, one electrode body 10 adjacent to each other with one insulator 20 sandwiched is a first electrode body (for example, When the other electrode body 10 is the second electrode body (for example, 10y in FIG. 2), the positive electrode tab 10b of the first electrode body 10x and the negative electrode tab 10c of the second electrode body 10y are used. The insulating tab 20b of the insulator 20 is arranged between the negative electrode tab 10c of the first electrode body 10x and the positive electrode tab 10b of the second electrode body 10y, and the electrode portions 10a and the first electrode body 10x of the first electrode body 10x are heat-bonded. 2 The electrode portion insulating portion 20a of the insulator 20 is arranged between the electrode portion 10y and the electrode portion 10a of the electrode body 10y.

As shown by the double-headed arrows in FIGS. 1 and 2, the positive electrode tab 10b of the first electrode body 10x and the negative electrode tab 10c of the second electrode body 10y are heat-bonded to form the first electrode body 10x and the second electrode body 10x. The electrode body 10y is connected in series. Whether or not the tabs 10b and 10c are heat-bonded can be easily determined visually. The tabs 10b and 10c may be heat-bonded via, for example, a conductive material that melts by heating such as solder. On the other hand, an insulating tab 20b is arranged between the negative electrode tab 10c of the first electrode body 10x and the positive electrode tab 10b of the second electrode body 10y, and the negative electrode tab 10c of the first electrode body 10x and the positive electrode of the second electrode body 10y. Insulated from the tab 10b.

The battery 100 is provided with a plurality of combinations including such a first electrode body 10x, a second electrode body 10y, and an insulator 20 arranged between the first electrode body 10x and the second electrode body 10y. As shown in FIGS. 1 and 2, the front and back directions of the first electrode body 10x and the second electrode body 10y may be opposite to each other. That is, when the direction of the surface of the first electrode body 10x is face up, the direction of the surface of the second electrode body 10y may be face down. In this way, the battery 100 can be more easily configured by laminating the electrode bodies 10x and 10y having the same shape so that the front and back sides are reversed via the insulator 20.

The number of electrode bodies 10 in the battery 100 is not particularly limited. The number of electrode bodies 10 may be appropriately determined according to the target battery performance.

As described above, according to the battery 100, the positive electrode tab 10b and the negative electrode tab 10c are heat-bonded, and a separate member such as a connecting member or a fixing member is unnecessary. Further, in the insulator 20 arranged between the electrode bodies 10 and 10, since the insulating tab 20b has a higher thermal conductivity than the electrode portion insulating portion 20a, the electrode portion of the electrode body 10 is subjected to heat bonding. The tabs 10b and 10c are heated preferentially over the 10a, and heat bonding can be performed in a short time. As a result, heat transfer to the electrode portion 10a is suppressed, and deterioration of battery performance due to heat is suppressed.

When the battery 100 is operating, the tabs 10b and 10c may generate heat due to energization. In such a case, heat is preferentially propagated from the generated tab to other tabs via the insulating tab 20b. Therefore, it is considered that heat transfer to the electrode portion 10a can be suppressed. That is, it is considered that the battery 100 not only has an effect of suppressing thermal deterioration of the electrode portion 10a during battery manufacturing, but also has an effect of suppressing thermal deterioration of the electrode portion 10a during battery operation.

2. Battery Manufacturing Method As described above, in the battery 100 of the present disclosure, some tabs of a plurality of electrode bodies 10 are heat-bonded to each other, while an insulator 20 is arranged between some tabs to insulate the battery 100. Such a battery 100 can be manufactured, for example, by a method as shown in FIG. 7.

First, a plurality of the above-mentioned electrode bodies 10 are prepared, and a plurality of the above-mentioned insulators 20 are prepared, and the electrode bodies 10 and the insulators 20 are alternately laminated to obtain a laminated body 30. In the laminated body 30, the front and back directions of one electrode body 10 (first electrode body 10x) and the other electrode body 10 (second electrode body 10y) that are adjacent to each other with one insulator 20 in between are opposite to each other. And. That is, the electrode bodies 10x and 10y are laminated with the insulator 20 so that the front and back sides are reversed. Needless to say, in the laminated body 30, the electrode body 10x and the electrode body 10y project tabs in the same direction. The tabs are heat-bonded to the laminate thus obtained by soldering or the like.

At the time of heat bonding, it is preferable to heat at least a portion of the laminated body 30 where tabs exist from both sides in the stacking direction, and heat-bond a plurality of tabs protruding from the side surfaces of the laminated body at once. For example, as shown in FIG. 7, heat bars are arranged on each of one end side and the other end side of the laminated body in the stacking direction, and the tab portion is heated from both ends in the stacking direction toward the center to tab the laminated body 30. A plurality of each other can be heat-bonded at one time. Here, since the insulator 20 constituting the laminated body 30 has a higher thermal conductivity in the insulating tab 20b than in the electrode portion insulating portion 20a as described above, the electrode portion of the electrode body 10 is heated by the heat bar. Heat is transferred more quickly in the stacking direction at the tabs 10b and 10c than at 10a, and the tabs 10b and 10c are heat-bonded in a short time. Therefore, heat transfer from the tabs 10b and 10c to the electrode portion 10a can be suppressed, and deterioration of battery performance due to heat can be suppressed.

The batteries of the present disclosure can be widely used from a small power source for mobile devices to a large power source for mounting on a car. In particular, it is suitable as a large power source for mounting on a car.

10 Electrode body 10a Electrode part 1 Positive electrode current collector 2 Negative electrode current collector 3 Positive electrode active material layer 4 Negative electrode active material layer 5 Electrode layer 10b Positive electrode tab 10c Negative electrode tab 20 Insulator 20a Electrode part insulation 20b Insulation tab 100 Battery

Claims (1)

A plurality of electrode bodies and insulators arranged between the plurality of electrode bodies are provided.
The electrode body includes an electrode portion and a positive electrode tab and a negative electrode tab protruding from the electrode portion.
The insulator includes an electrode portion insulating portion and an insulating tab protruding from the electrode portion insulating portion.
The thermal conductivity of the insulating tab is higher than the thermal conductivity of the electrode insulating portion.
When one of the electrode bodies adjacent to each other across the insulator is used as the first electrode body and the other electrode body is used as the second electrode body, the positive electrode tab of the first electrode body and the second electrode body are used. The negative electrode tab of the electrode body is heat-bonded, and the insulating tab of the insulator is arranged between the negative electrode tab of the first electrode body and the positive electrode tab of the second electrode body. The electrode portion insulating portion of the insulator is arranged between the electrode portion and the electrode portion of the second electrode body.
battery.

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