WO2013051137A1

WO2013051137A1 - Assembled battery and production method for assembled battery

Info

Publication number: WO2013051137A1
Application number: PCT/JP2011/073127
Authority: WO
Inventors: 曜辻子; 道行井出
Original assignee: トヨタ自動車株式会社
Priority date: 2011-10-06
Filing date: 2011-10-06
Publication date: 2013-04-11

Abstract

Provided is an assembled battery having great energy density and wherein wasted space around a connection section can be reduced. The assembled battery has a first layered battery comprising a plurality of collectors, a second layered battery comprising a plurality of collectors, and the connection section that bundles and connects the plurality of collectors disposed in the first layered battery and the plurality of collectors disposed in the second layered battery. Collectors among the plurality of collectors disposed in the first layered battery that are disposed on the opposite side to the second layered battery are folded and bent into a substantially L shape, from the first layered battery to the connection section.

Description

Assembled battery and manufacturing method of assembled battery

The present invention relates to a connection structure when a plurality of laminated batteries are connected to form an assembled battery.

In recent years, from the viewpoint of protecting the global environment, a high-output and high-capacity power source is required to be applied to electric vehicles and hybrid vehicles as low-pollution vehicles. Further, in fields other than automobiles and the like, power supplies capable of improving the performance of mobile tools are required due to the global spread of mobile tools such as information-related devices and communication devices.

When a battery such as a lithium battery is used as a power source, particularly when a large-scale power source for vehicles such as an electric vehicle and a hybrid vehicle is used, a plurality of single cells are stacked to form a stacked battery, and further, a plurality of the stacked batteries are connected. It is preferable to make a battery pack. In particular, by connecting a plurality of stacked batteries in series, a high-power assembled battery can be obtained, and it can be suitably used as a large-scale power source for vehicles.

For example, in Patent Document 1, at the outer periphery of a plurality of stacked unit cells, the plurality of unit cells are stacked to form a battery bundle (stacked battery), and further, a plurality of the battery bundles are connected in series. The battery is configured. According to Patent Document 1, a battery bundle can be formed easily and cost-effectively.

JP 2005-528741 Gazette

However, the assembled battery described in Patent Document 1 has a problem that there is a lot of wasted space around the connection part between the stacked batteries, and the energy density of the assembled battery as a whole is small.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an assembled battery having a large energy density that can reduce a useless space around a connection portion.

In order to solve the above-mentioned problems, the present inventor has intensively studied, and a plurality of current collectors provided in one stacked battery and a plurality of current collectors provided in another stacked battery are bundled in series. When connecting and configuring an assembled battery, the current collector on the outside of the assembled battery is connected to the vicinity of the active material coating end of the stacked battery by bundling the current collector while bending it into a substantially L shape. It has been found that a part can be provided and a useless space around the connection part can be reduced. In addition, when a plurality of current collectors are bundled while bending the outer current collector into a substantially L shape in this way, the outer current collector may be broken when the bundled current collectors are connected by welding or the like. It was also found that can be effectively suppressed.

The present invention has been made based on the above findings. That is,
According to a first aspect of the present invention, there is provided a first stacked battery including a plurality of current collectors, a second stacked battery including a plurality of current collectors, and a plurality of provided in the first stacked battery. A connection part that bundles and connects the current collector and the plurality of current collectors provided in the second multilayer battery, and the second current collector among the plurality of current collectors provided in the first multilayer battery. The current collector provided on the side opposite to the stacked battery is an assembled battery having a substantially L shape from the first stacked battery to the connection portion.

In the present invention, “bundling and connecting a plurality of current collectors” means connecting the first stacked battery and the second stacked battery in series or in parallel. From the viewpoint of a high output assembled battery, it is preferable to bundle them in series. For example, the first stacked battery and the second stacked battery are bundled by bundling a plurality of positive electrode current collectors provided in the first stacked battery and a plurality of negative electrode current collectors provided in the second stacked battery. A battery can be connected in series. “The current collector is approximately L-shaped” means that the current collector is bent so that the cross-sectional shape thereof is approximately L-shaped. The “substantially L-shape” does not necessarily need to be a complete L-shape (a shape bent at 90 °), and may be in a state where the current collector is bent and bent.

For example, in the first aspect of the present invention, the current collector provided on the opposite side to the second stacked battery among the plurality of current collectors provided in the first stacked battery is the first It is preferable to have the 1st part extended toward a 2nd laminated battery from a laminated battery, and the 2nd part extended toward a connection part from a 1st part. If it is such a form, the electrical power collector of the outer side of a 1st laminated battery can be made into the state bent appropriately in the substantially L shape.

In the first aspect of the present invention, the current collector provided on the side opposite to the first stacked battery among the plurality of current collectors provided in the second stacked battery is further provided with the second It is preferable that it is made into the substantially L shape from a laminated battery to a connection part. In both the first stacked battery and the second stacked battery, the waste current around the connection portion can be further reduced by bending the outer current collector into a substantially L shape.

In the first aspect of the present invention, the current collector provided on the side opposite to the first stacked battery among the plurality of current collectors provided in the second stacked battery is further provided with the second It is preferable to have a third portion extending from the stacked battery toward the first stacked battery and a fourth portion extending from the third portion toward the connection portion. If it is such a form, the collector outside the 2nd lamination battery can be made into the state where it bent appropriately in the shape of an abbreviated L character.

According to a second aspect of the present invention, a plurality of current collectors provided in the first stacked battery and a plurality of current collectors provided in the second stacked battery are bundled and connected via a connection portion. A connecting step, wherein, in the connecting step, a current collector provided on the opposite side of the second stacked battery among the plurality of current collectors provided in the first stacked battery is replaced with the first stacked battery. The battery assembly is manufactured by bundling a plurality of current collectors provided in the first multilayer battery and a plurality of current collectors provided in the second multilayer battery while being bent into a substantially L shape from the connection portion to the connection portion. Is the method.

In the second aspect of the present invention, the connecting step includes a first folding step of bending the plurality of current collectors provided in the first multilayer battery toward the second multilayer battery, and the plurality of folded current collectors. And a second bending step of bending the second laminated battery from the second laminated battery side toward the connecting portion. By setting it as such a process, the electrical power collector of the outer side of a 1st laminated battery can be more appropriately and easily bent by substantially L shape.

In the connecting step according to the second aspect of the present invention, a current collector provided on the side opposite to the first multilayer battery among the plurality of current collectors provided in the second multilayer battery is further provided. A plurality of current collectors provided in the first multilayer battery and a plurality of current collectors provided in the second multilayer battery while being bent into a substantially L shape from the second multilayer battery to the connection portion. It is preferable to bundle. In both the first stacked battery and the second stacked battery, a wasteful space around the connection portion can be further reduced by bending the outer current collector into a substantially L shape.

In the second aspect of the present invention, the connecting step further includes a third bending step of bending a plurality of current collectors provided in the second stacked battery toward the first stacked battery side, and a plurality of folded current collectors. It is preferable to include a fourth bending step of bending the electric body from the first stacked battery side of the second stacked battery toward the connection portion. By setting it as such a process, the electrical power collector of the outer side of a 2nd laminated battery can be more appropriately and easily bent by substantially L shape.

Alternatively, for the same purpose as the first aspect of the present invention, the following assembled battery may be used. That is, the third aspect of the present invention is provided in a first stacked battery in which a plurality of current collectors are stacked, a second stacked battery in which a plurality of current collectors are stacked, and a first stacked battery. It has a connection part which bundles and connects the current collector and the current collector provided in the second multilayer battery, and the second multilayer battery among the current collectors provided in the first multilayer battery is The current collector provided on the opposite side is an assembled battery having a substantially L shape from the first stacked battery to the connection portion.

Here, “a laminated battery in which a plurality of current collectors are laminated” means a laminated battery in which a plurality of current collectors are laminated via a positive electrode layer or the like. Is a concept that includes a configuration in which a plurality of current collectors are stacked via a positive electrode layer or the like in the cross-sectional shape by winding. That is, the “wrapped battery” is included in the “stacked battery” referred to in the present invention. In this case, when the current collector extending from the first wound battery and the current collector extending from the second wound battery are bundled to form the connection portion, the current collector extending from the first wound battery is connected. What is necessary is just to make it a substantially L shape over a part.

In the present invention, when one stacked battery and another stacked battery are connected in series, the current collector outside the one stacked battery is bent into a substantially L shape and bent to be bundled. Thereby, a current collector can be connected in the vicinity of the laminated battery, and a useless space around the connection portion can be reduced. That is, according to the present invention, an assembled battery having a large energy density can be provided.

It is the schematic which shows the structure of the assembled battery which concerns on a prior art example (comparative example). It is the schematic for demonstrating the problem of the assembled battery which concerns on a prior art example (comparative example). It is the schematic for demonstrating the assembled battery of this invention which concerns on one Embodiment. It is the schematic for demonstrating the shape of an outside electrical power collector. It is the schematic for demonstrating the manufacturing process of the assembled battery which concerns on one Embodiment. It is the schematic for demonstrating the manufacturing process of the assembled battery which concerns on one Embodiment. It is the schematic for demonstrating the assembled battery of this invention which concerns on other embodiment. It is the schematic which shows an example of the cell which comprises a laminated battery. It is the schematic which shows an example of a laminated battery.

1. Problems of the Prior Art FIG. 1 schematically shows an assembled battery 500 in which a plurality of current collectors are bundled and connected in series. As illustrated in FIG. 1, the assembled battery 500 includes a first stacked battery 501 including a plurality of current collectors 510, a second stacked battery 502 including a plurality of current collectors 520, and a first stacked battery. A plurality of current collectors 510 provided in the battery 501 and a plurality of current collectors 520 provided in the second stacked battery 502 are bundled and connected to each other in series.

In the assembled battery 500, a plurality of

current collectors

510 and 520 are stretched from the stacked

batteries

501 and 502 to the connection portion 505. In particular, the

current collectors

510a and 520a provided on the outermost side of the stacked battery are in a state of being strongly stretched. In the assembled battery 500, the distance between the

stacked batteries

501 and 502 and the connection portion 505 is long, and a useless space is generated around the connection portion 505.

Further, when manufacturing the assembled battery 500, the following problems may occur. That is, as shown in FIG. 2, when the number of unit cells in the stacked

batteries

501 and 502 is large, the

current collectors

510a and 520a provided on the outermost side of the stacked

batteries

501 and 502 are strongly stretched. . In such a case, when the connection portion 505 is formed using a bonding machine such as an ultrasonic bonding machine, the stretched

current collectors

510a and 520a are brought into contact with the horn and the anvils A and A of the bonding machine. Easily torn. In order to prevent the current collector from being broken, it is necessary to join at a position where the joining machine does not contact the current collector. I was forced to form.

The present invention solves such a conventional problem. According to the present invention, it is possible to reduce the useless space around the connection portion and increase the energy density of the assembled battery as a whole. In addition, when the connecting portion is formed by a bonding machine, the current collector can be prevented from being broken. Hereinafter, specific embodiments of the present invention will be described.

2. FIG. 3 schematically shows an assembled battery 100 according to an embodiment of the present invention. As illustrated in FIG. 3, the assembled battery 100 includes a first stacked battery 1 including a plurality of current collectors 10, a second stacked battery 2 including a plurality of current collectors 20, and a first stacked battery. A plurality of current collectors 10 provided in the battery 1 and a plurality of current collectors 20 provided in the second stacked battery 2 are bundled and connected to each other in series. In the assembled battery 100, the current collector 10 is a positive electrode current collector, and the current collector 20 is a negative electrode current collector.

In the assembled battery 100, the current collector 10a provided on the side opposite to the second stacked battery 2 among the plurality of current collectors 10 provided in the first stacked battery 1 has a cross-sectional shape of From the laminated battery 1 of FIG. Furthermore, in the assembled battery 100, the current collector 20 a provided on the side opposite to the first stacked battery 1 among the plurality of current collectors 20 provided in the second stacked battery 2 has a cross-sectional shape. From the second laminated battery 2 to the connecting portion 5, it is substantially L-shaped.

The shape of the

current collectors

10a and 20a will be described in more detail with reference to FIG. As shown in FIG. 4, the current collector 10 a extends from the first stacked battery 1 toward the second stacked battery 2 and from the first portion 11 toward the connecting portion 5. And a second portion 12. The first portion 11 and the second portion 12 have a substantially L-shaped cross section. On the other hand, the current collector 20 a includes a third portion 23 extending from the second stacked battery 2 toward the first stacked battery 1, and a fourth portion 24 extending from the third portion 23 toward the connecting portion 5. Again, the third part 23 and the fourth part 24 have a substantially L-shaped cross section.

As shown in FIGS. 3 and 4, the current collector provided in the vicinity of the second stacked battery 2 among the plurality of current collectors 10 is hardly bent and is connected to the connecting portion 5 from the first stacked battery 1. It extends almost vertically over to. In addition, among the plurality of current collectors 20, the current collector provided in the vicinity of the first multilayer battery 1 extends almost vertically from the second multilayer battery 2 to the connection portion 5 with almost no bending. Yes. That is, in the assembled battery 100, the cross-sectional shape becomes closer to an approximately L shape as the current collector is on the outer side.

As described above, in the assembled battery 100, when the plurality of current collectors 10 provided in the first stacked battery 1 and the plurality of current collectors 20 provided in the second stacked battery 2 are bundled and connected in series. The

current collectors

10a and 20a outside the multilayer battery are bent into a substantially L shape, and the

current collectors

10 and 20 are bundled together. It can be provided close to the active material coating end. That is, according to the assembled battery 100, a useless space around the connection portion can be reduced, and the energy density of the assembled battery as a whole can be increased as compared with the conventional battery.

3. Manufacturing method of assembled battery A manufacturing method of an assembled battery according to the present invention is a series of bundles of a plurality of current collectors provided in a first stacked battery and a plurality of current collectors provided in a second stacked battery. A connection step is provided, and in the connection step, a plurality of current collectors provided in the first stacked battery are provided on the side opposite to the second stacked battery. The plurality of current collectors provided in the first multilayer battery and the plurality of current collectors provided in the second multilayer battery while the current collector is bent in a substantially L shape from the first multilayer battery to the connection portion. It bundles the current collector. Hereinafter, a method for manufacturing the assembled battery 100 according to the embodiment will be described with reference to FIGS.

In the connecting step, for example, as shown in FIG. 5A, a first laminated battery 1 before bending a plurality of current collectors 10 is prepared, as shown in FIGS. 5B and 5C. The first folding step of bending the plurality of current collectors 10 provided in the first laminated battery 1 to the side that becomes the second laminated battery 2 side when the assembled battery 100 is formed (FIG. 5B). And a second bending step of bending the plurality of bent current collectors 10 from the second stacked battery 2 side of the first stacked battery 1 toward the connection portion 5 when the assembled battery 100 is used. (FIG. 5C). As a result, among the plurality of current collectors 10 provided in the first multilayer battery 1, the current collector 10 a provided on the side opposite to the second multilayer battery 2 is connected from the first multilayer battery 1. It can be bent into a substantially L shape over the part 5, and the cross-sectional shape can be made closer to a substantially L shape as the current collector is on the outer side.

And also about the 2nd laminated battery 2, it is the same as that of the 1st laminated battery 1, and current collector 20a provided in the opposite side to the 1st laminated battery 1 among a plurality of current collectors 20 is used. The second laminated battery 2 is bent into a substantially L shape from the connection portion 5 to the connection portion 5. That is, a third folding step of bending the plurality of current collectors 20 provided in the second multilayer battery 2 toward the first multilayer battery 1 side, and the plurality of folded current collectors 20 into the second multilayer battery 2. The 4th bending process bent toward the connection part 5 from the 1st laminated battery 1 side is performed.

For the first laminated battery 1 and the second laminated battery 2 obtained in this way, a plurality of

current collectors

10 and 20 are bundled and connected in series. 6A, the bundled

current collectors

10 and 20 are inserted between the anvils A and A of the ultrasonic bonding machine, and the

current collectors

10 and 20 are bonded by ultrasonic bonding. Then, the connection part 5 as shown in FIG. 6B can be formed, and the assembled battery 100 can be manufactured. At this time, since the outermost

current collectors

10a and 20a are bent in a substantially L shape, even if the anvils A and A come into contact with each other, they are not easily broken. Further, since the

current collectors

10 and 20 can be inserted between the anvils A and A to the vicinity of the substantially L-shaped roots of the

current collectors

10a and 20a, the connection portion 5 is connected to the

stacked batteries

1 and 2 It can form in the active material coating part vicinity. That is, when connecting the bundled

current collectors

10 and 20 by welding or the like, it is possible to effectively prevent the outer

current collectors

10a and 20a from being broken, and to reduce a useless space around the connecting portion 5. In addition, the energy density of the assembled battery as a whole can be increased as compared with the prior art.

4). Other Embodiments FIG. 7 schematically shows an assembled battery 200 according to another embodiment. As shown in FIG. 7, in the assembled battery 200, the first laminated battery 1, the second laminated battery 2, the third laminated battery 3, and the fourth laminated battery 4 are connected in series in order. More specifically, the plurality of current collectors 10 to 60 provided in each of the stacked batteries 1 to 4 are folded in a substantially L shape toward an adjacent current collector as a connection destination and bundled to be connected. Has been. Thus, in the assembled battery according to the present invention, the number of stacked batteries to be used can be arbitrarily increased, and a useless space around the connection portion can be reduced in any connection portion. That is, an assembled battery having a high capacity and a large energy density can be obtained.

5. Laminated battery, unit cell In the assembled battery as described above, the type of the laminated battery to be used is not particularly limited. For example, it is preferable to use an all-solid battery or a polymer electrolyte battery. Alternatively, it is possible to use an electrolyte battery. However, when using an electrolyte battery, a separate structure for preventing leakage of the electrolyte is required.

5.1. Single Cell FIG. 8 shows a single cell 2a as an example of a single cell for constituting a laminated battery. The unit cell 2a includes a positive electrode layer 2ac, a negative electrode layer 2aa, and an electrolyte layer 2ae provided between the positive electrode layer 2ac and the negative electrode layer 2aa. The positive electrode current collector is in contact with the positive electrode layer 2ac. 30x is provided, and the negative electrode current collector 20x is provided so as to be in contact with the negative electrode 2aa. The unit cell 2a can be used, for example, as a unit cell in the second stacked cell 2 of FIG. Hereinafter, although the case where the unit cell 2a is an all-solid lithium battery will be described, the present invention is not limited to this embodiment. A sodium battery, a potassium battery, a calcium battery, a lithium air battery, or the like may be used. However, it is preferable to use an all-solid lithium battery or a polymer electrolyte battery from the viewpoint of high safety, easy production of the assembled battery, and obtaining an assembled battery with a higher energy density.

5.1.1. Positive electrode layer, negative electrode layer The positive electrode layer 2ac and the negative electrode layer 2aa included in the unit cell 2a are layers including an active material and an electrolyte, and optionally including a conductive additive and a binder. When the unit cell 2a is an all-solid lithium battery, the active materials include LiCoO ₂ , LiNiO ₂ , Li _{1 + x} Ni _1/3 Mn _1/3 Co _1/3 O ₂ , LiMn ₂ O ₄ , Li _{1 + x} Mn _{2 _{_{-x-y M y O 4 (}}} M is Al, Mg, Co, Fe, Ni, either Zn) different element substituted Li-Mn spinel represented _{_{_{by, Li x TiO y, LiMPO 4}}} (M is Fe, Mn, Co, or Ni), V ₂ O ₅ , MoO ₃ , TiS ₂ , graphite, carbon material such as hard carbon, LiCoN, Li _x Si _y O _z , lithium metal or lithium alloy (LiM, M is Sn , Si, Al, Ge, Sb , or the like P), lithium storage intermetallic compound _(Mg x M, M is Sn, Ge, either Sb, _or, N y Sb, N is I , Cu, any of Mn) and can be used these derivatives. Here, there is no clear distinction between the positive electrode active material and the negative electrode active material, the positive and negative potentials are compared with the positive electrode layer 2ac when the charge / discharge potentials of the two types of compounds are compared, and the negative electrode is the negative electrode. Using the layer 2aa, a lithium cell 2a having an arbitrary voltage can be configured.

Further, when the unit cell 2a is an all-solid lithium battery, a solid electrolyte is used as the electrolyte. Specifically, an oxide-based amorphous solid electrolyte such as Li ₂ O—B ₂ O ₃ —P ₂ O ₅ , Li ₂ O—SiO ₂ , Li ₂ O—B ₂ O ₃ —ZnO, Li ₂ S —SiS ₂ , LiI—Li ₂ S—SiS ₂ , LiI—Li ₂ S—P ₂ S ₅ , LiI—Li ₂ S—B ₂ S ₃ , Li ₃ PO ₄ —Li ₂ S—Si ₂ S, Li ₃ PO ₄ —Li ₂ S—SiS ₂ , LiPO ₄ —Li ₂ S—SiS, LiI—Li ₂ S—P ₂ O ₅ , LiI—Li ₃ PO ₄ —P ₂ S ₅ , Li ₂ S—P ₂ S ₅ Sulfide-based amorphous solid electrolyte such as LiI, LiI—Al ₂ O ₃ , Li ₃ N, Li ₃ N—LiI—LiOH, etc., Li _1.3 Al _0.3 Ti _0.7 (PO _{_{_{_{4) 3, Li 1 + x}}}} + y A x Ti 2-x Si y P 3-y O ₂ (A is Al or Ga, 0 ≦ x ≦ 0.4,0 < y ≦ 0.6), [(B 1/2 Li 1/2) 1-z C z] TiO 3 (B is La, Pr , Nd, or Sm, C is Sr or Ba, 0 ≦ z ≦ 0.5), Li ₅ La ₃ Ta ₂ O ₁₂ , Li ₇ La ₃ Zr ₂ O ₁₂ , Li ₆ BaLa ₂ Ta ₂ O ₁₂ , Crystalline oxides and oxynitrides such as Li ₃ PO _{(4-3 / 2w)} N _w (w <1) and Li _3.6 Si _0.6 P _0.4 O ₄ can be used.

As the conductive auxiliary agent, conventional ones can be used without any particular limitation. For example, a carbon material such as acetylene black is preferably used. As the binder, conventional ones can be used without particular limitation. For example, it is preferable to use a fluorine resin such as polyvinylidene fluoride, a rubber-like resin such as styrene butadiene rubber (SBR), or the like.

The mixing ratio of each substance contained in the positive electrode layer 2ac and the negative electrode layer 2aa is not particularly limited as long as the unit cell 2a can be operated appropriately. For example, the mixing ratio of active material: electrolyte: conductive aid: binder = 99 to 40: 1 to 50: 0 to 5: 0 to 5 can be used. In addition, the thickness, shape, and the like are not particularly limited as long as the positive electrode layer 2ac and the negative electrode layer 2aa are appropriately formed on the positive electrode current collector 30x and the negative electrode current collector 20x described later. For example, the thickness can be about 5 to 500 μm. The positive electrode layer 2ac and the negative electrode layer 2aa may be formed by applying and drying a paste containing the active material or the like on the positive electrode current collector 30x and the negative electrode current collector 20x with a doctor blade or the like, or the powdery active material Etc. can be formed and produced by press molding.

5.1.2. Electrolyte Layer The electrolyte layer 2ae is a layer containing an electrolyte. When the unit cell 2a is an all-solid lithium battery, the electrolyte layer 2ae includes a solid electrolyte and, optionally, a binder. As the solid electrolyte, the above-described solid electrolyte can be used. The same binder as described above can be used.

The mixing ratio of each substance contained in the electrolyte layer 2ae is not particularly limited as long as it is a ratio capable of appropriately operating the unit cell 2a. For example, the mixing ratio of electrolyte: binder = 100 to 70: 0 to 30 can be set at a mass ratio. In addition, the electrolyte layer 2ae is appropriately provided between the positive electrode layer 2ac and the negative electrode layer 2aa, and can have a thickness, shape, or the like as long as it can contribute to ion conduction between the positive electrode layer 2ac and the negative electrode layer 2aa. Is not particularly limited. For example, the thickness can be about 0.1 to 500 μm. The electrolyte layer 2ae is formed by applying and drying a paste containing the electrolyte or the like on the positive electrode layer 2ac or the negative electrode layer 2aa with a doctor blade or the like, or press molding the powdery solid electrolyte or the like.・ Can be produced.

5.1.3. Positive electrode current collector, negative electrode current collector When the single battery 2a is an all solid lithium battery, the positive electrode current collector 30x and the negative electrode current collector 20x can be applied to an all solid lithium battery, The material and the like are not particularly limited. For example, metal foil, a metal mesh, a metal vapor deposition film, etc. can be used. Specifically, Cu, Ni, Al, V, Au, Pt, Mg, Fe, Ti, Co, Zn, Ge, In, stainless steel and other metal foils and meshes, or polyamide, polyimide, PET, PPS, A film made of polypropylene or the like, a glass, a silicon plate, or the like deposited on the metal can be used. The thicknesses of the positive electrode current collector 30x and the negative electrode current collector 20x are not particularly limited. For example, the thickness can be about 5 to 500 μm. The size of the positive electrode current collector 30x and the negative electrode current collector 20x may be a size that allows the current collectors to be bundled after being formed into a stacked battery.

The unit cell 2a only needs to include the positive electrode layer 2ac, the electrolyte layer 2ae, the negative electrode layer 2aa, the positive electrode current collector 30x, and the negative electrode current collector 20x, and may be a monopolar battery or a bipolar battery. May be.

5.2. Stacked Battery FIG. 9 schematically shows a stacked battery 2 formed by stacking a plurality of the unit cells 2a. The laminated battery 2 can be used, for example, as the second laminated battery 2 in FIG. As shown in FIG. 9, the laminated battery 2 is accommodated in a state in which a plurality of

single cells

2a, 2a are laminated in a casing. The stacked battery 2 has a plurality of positive electrode current collectors 30 (30x, 30x,...) Extending from one side surface of the housing, and a plurality of negative electrode current collectors 20 (20x, 20x,...) From the other side surface. Is extended. By preparing a plurality of such laminated batteries and connecting the current collector in series with the current collectors of other laminated batteries while bending the current collector into a substantially L shape as described above, an assembled battery can be configured. .

Although the assembled battery according to the present invention has been described above, the present invention is not limited to the specific form described above.

For example, in the above description, the current collector 10a of the first multilayer battery 1 and the current collector 20a of the second multilayer battery 2 are both described as being bent into a substantially L shape. It is not limited to the said form. For example, only the plurality of current collectors 10 of the first multilayer battery 1 are bent into a substantially L shape as described above, and the plurality of current collectors 20 of the second multilayer battery 2 have other shapes. It is also possible. However, from the viewpoint of more effectively preventing the current collector from being broken by contact with the bonding machine in the connection process, which can easily reduce useless space, the first stacked battery 1 and the second stacked battery 2 are used. And the current collector 10a of the first multilayer battery 1 and the current collector 20a of the second multilayer battery 2 are both preferably bent into a substantially L shape. .

Further, in the above description, when the assembled battery is manufactured, the plurality of current collectors 10 provided in the first laminated battery 1 are arranged on the side that becomes the second laminated battery 2 side when the assembled battery 100 is used. The first bending step of bending and the plurality of bent current collectors 10 from the second stacked battery 2 side of the first stacked battery 1 toward the connecting portion 5 when the assembled battery 100 is formed. Although it demonstrated as performing the 2nd bending process to bend, this invention is not limited to the said form. In the assembled battery, the more the current collector is on the outer side, the more the

current collectors

10 and 20 may be bent or bent so that the cross-sectional shape approaches a substantially L shape. After bundling, the

current collectors

10a and 20a can be bent by pressing against the active material coating end of the

laminated batteries

1 and 2 to form an L-shape.

Further, in the above-described assembled battery, it has been described that one stacked battery and another stacked battery are connected in series, but the present invention is not limited to this form. One stacked battery and another stacked battery may be connected in parallel. However, from the viewpoint of a high output assembled battery, a configuration in which one laminated battery and another laminated battery are connected in series is preferable.

Further, for the same purpose as the above-described assembled battery, the following assembled battery can also be included in the present invention. That is, a first laminated battery in which a plurality of current collectors are laminated, a second laminated battery in which a plurality of current collectors are laminated, and a current collector and a second laminated battery provided in the first laminated battery A current collector provided on the side opposite to the second stacked battery among the current collectors provided in the first stacked battery; However, an assembled battery having a large energy density can be provided by the assembled battery that is substantially L-shaped from the first stacked battery to the connecting portion. The term “laminated battery in which a plurality of current collectors are laminated” means a laminated battery in which a plurality of current collectors are laminated via a positive electrode layer or the like. Thus, the cross-sectional shape is a concept including a form in which a plurality of current collectors are stacked via a positive electrode layer or the like. That is, the “wrapped battery” is included in the “stacked battery” referred to in the present invention. In this case, when the current collector extending from the first wound battery and the current collector extending from the second wound battery are bundled to form the connection portion, the current collector extending from the first wound battery is connected. What is necessary is just to make it a substantially L shape over a part.

Hereinafter, the assembled battery according to the present invention will be described in detail based on examples.

A plurality of laminated batteries were manufactured by laminating 59 layers of lithium all solid state cells. The produced laminated battery was used as an assembled battery.

(Example)
The assembled battery 100 as shown in FIG. 3 is produced using an ultrasonic bonding machine, and the distance from the active material coating end to the connection part 5 and the presence or absence of breakage of the

current collectors

10a and 20a are confirmed. As a result, even when the distance from the active material coating end to the connection portion 5 was close to about 10 mm, the assembled battery 100 could be stably manufactured without breaking the

current collectors

10a and 20a. .

(Comparative example)
An assembled battery 500 as shown in FIG. 1 is manufactured using an ultrasonic bonding machine, and the distance from the active material coating end to the bonding portion 505 and whether or not the

current collectors

10a and 20a are torn are confirmed. As a result, the distance at which the assembled battery can be manufactured stably without breaking the

current collectors

510a and 520a was about 20 mm. When the connection part 505 was brought closer to the active material coating end, the

current collectors

510a and 520a were broken.

In this way, as in the

current collectors

10a and 20a, when the outer current collector is bent into a substantially L shape and a plurality of current collectors are bundled to form the connection portion 5, the connection is made from the active material coating end. It was possible to reduce the distance to the part 5. That is, according to the present invention, it was proved that a useless space around the connection portion can be reduced, and an assembled battery having a high energy density can be obtained.

The battery pack according to the present invention has a reduced useless space around the joint, has a high energy density, and can be suitably used particularly as a power source for mounting on a vehicle.

DESCRIPTION OF SYMBOLS 1 1st laminated battery 2 2nd laminated battery 2a Single battery 2ac Positive electrode layer 2ae Electrolyte layer 2aa Negative electrode layer 3 3rd laminated battery 4 4th laminated battery 5 Connection part 10 Several collector 10a Outermost collector Current collector 11 First portion 12 Second portion 20 Multiple current collectors 20a Outermost current collector 23 Third portion 24 Fourth portion 30 Multiple current collectors 40 Multiple current collectors 50 Multiple current collectors Current collector 60 Multiple current collectors

Claims

A first laminated battery comprising a plurality of current collectors;
A second laminated battery comprising a plurality of current collectors; and
A plurality of current collectors provided in the first stacked battery and a plurality of current collectors provided in the second stacked battery;
Among the plurality of current collectors provided in the first multilayer battery, a current collector provided on the side opposite to the second multilayer battery is substantially extended from the first multilayer battery to the connection portion. An assembled battery that is L-shaped.
The assembled battery according to claim 1, wherein the plurality of current collectors are bundled and connected in series at the connection portion.
Among the plurality of current collectors provided in the first stacked battery, a current collector provided on the opposite side of the second stacked battery is connected to the second stacked battery from the first stacked battery. The assembled battery according to claim 1, comprising a first portion extending toward the battery and a second portion extending from the first portion toward the connection portion.
Of the plurality of current collectors provided in the second stacked battery, a current collector provided on the side opposite to the first stacked battery is connected from the second stacked battery to the connection portion. The assembled battery according to any one of claims 1 to 3, wherein the assembled battery is substantially L-shaped.
Among the plurality of current collectors provided in the second stacked battery, a current collector provided on the opposite side of the first stacked battery is connected to the first stacked battery from the second stacked battery. The assembled battery according to claim 4, further comprising a third portion extending toward the battery and a fourth portion extending from the third portion toward the connection portion.
A first laminated battery in which a plurality of current collectors are laminated;
A second laminated battery in which a plurality of current collectors are laminated; and
A connecting portion for connecting the current collector provided in the first stacked battery and the current collector provided in the second stacked battery in a bundle;
Among the current collectors provided in the first multilayer battery, a current collector provided on the opposite side of the second multilayer battery is substantially L-shaped from the first multilayer battery to the connection portion. A battery pack that is shaped.
A connecting step of bundling and connecting a plurality of current collectors provided in the first stacked battery and a plurality of current collectors provided in the second stacked battery, and comprising a connection step;
In the connecting step, among the plurality of current collectors provided in the first multilayer battery, the current collector provided on the side opposite to the second multilayer battery is removed from the first multilayer battery. An assembled battery in which a plurality of current collectors provided in the first stacked battery and a plurality of current collectors provided in the second stacked battery are bundled while being bent into a substantially L shape over the connecting portion. Production method.
The connecting step includes a first folding step of bending a plurality of current collectors provided in the first stacked battery toward the second stacked battery side, and a plurality of bent current collectors are connected to the first stack. The manufacturing method of the assembled battery of Claim 7 which has a 2nd bending process bent toward the said connection part from the said 2nd laminated battery side of a battery.
In the connecting step, among the plurality of current collectors provided in the second stacked battery, a current collector provided on the opposite side to the first stacked battery is further connected to the second stacked battery. The plurality of current collectors provided in the first multilayer battery and the plurality of current collectors provided in the second multilayer battery while being bent into a substantially L shape from the battery to the connection portion. The manufacturing method of the assembled battery of Claim 7 or 8 bundled.
The connecting step further includes a third bending step of bending a plurality of current collectors provided in the second stacked battery toward the first stacked battery, and a plurality of bent current collectors, The manufacturing method of the assembled battery of Claim 9 which has a 4th bending process bent toward the said connection part from the said 1st laminated battery side of the laminated battery of this.