JP4617672B2 - Laminated battery module and manufacturing method thereof - Google Patents

Laminated battery module and manufacturing method thereof Download PDF

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Publication number
JP4617672B2
JP4617672B2 JP2003432360A JP2003432360A JP4617672B2 JP 4617672 B2 JP4617672 B2 JP 4617672B2 JP 2003432360 A JP2003432360 A JP 2003432360A JP 2003432360 A JP2003432360 A JP 2003432360A JP 4617672 B2 JP4617672 B2 JP 4617672B2
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laminated battery
bent
terminal
electrode terminal
battery module
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JP2005190885A (en
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俊彦 井上
行正 西出
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トヨタ自動車株式会社
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage
    • Y02E60/12Battery technologies with an indirect contribution to GHG emissions mitigation

Description

  The present invention relates to a laminated battery module in which a plurality of batteries each using a laminate film as an exterior body are connected, and a method for manufacturing the same. More specifically, the present invention relates to a laminate battery module using a battery having flat bipolar terminals and a manufacturing method including a method of connecting the flat terminals.

2. Description of the Related Art Conventionally, a light and thin secondary battery using a laminate film as an exterior body, such as a lithium ion battery, is often used. In such a secondary battery, heat is generated particularly during charging and discharging. In particular, a laminated battery module in which a plurality of secondary batteries are connected is generally cooled by cooling air. For example, a configuration of a laminated battery module has been proposed in which a plurality of laminated batteries are connected side by side and cooled by flowing cooling air along the surface (see, for example, Patent Document 1). When a laminated battery module is configured by laminating a plurality of laminated batteries, the positive and negative electrodes of adjacent batteries are connected by a bus bar or the like as shown in FIG.
Japanese Unexamined Patent Publication No. 2003-187767 (page 3, FIG. 2)

  However, when the laminated battery module 100 as shown in FIG. 10 is arranged so that the cooling air flows in the stacking direction as indicated by the arrows in the drawing, the cooling air is removed except for one laminated battery on the windward side. The cooling area that touches is very small. The stacking direction and the cooling air direction may be limited due to other structural reasons. In the case shown in FIG. 10, there is a problem that the cooling efficiency is low and the cooling effect is not sufficient. It was. Therefore, an efficient cooling method has been demanded even in a combination in which the stacking direction and the cooling air are in the same direction.

  The present invention has been made to solve the problems of the conventional laminated battery module described above. That is, the problem is that a laminated battery module in which each laminated battery is laminated and connected and the cooling efficiency is improved when cooling air flows in the lamination direction so as to flow cooling air, and a manufacturing method thereof. It is to provide.

The laminated battery module of the present invention made for the purpose of solving this problem is a laminated battery in which a plurality of laminated batteries each having a power generating element and a flat electrode terminal are stacked and connected in series with each other facing down. Each laminated battery has a bipolar terminal on the same side, and the bipolar terminal has an extended part extending in one direction from the power generation element and an extended part protruding laterally from the extended part. However, the protruding part of the bipolar terminal is bent in the opposite direction between the positive electrode terminal and the negative electrode terminal, the bent part of the positive electrode terminal is connected to the bent part of the negative electrode terminal of the adjacent laminated battery, and the bent part of the negative electrode terminal Is connected to the bent portion of the positive terminal of the adjacent laminated battery.

  The laminate battery module of the present invention is a laminate battery module in which a plurality of laminate batteries are connected in series. Furthermore, since both electrode terminals have a protruding portion protruding from the extending portion, and the protruding portion is bent in the opposite direction between the positive electrode terminal and the negative electrode terminal, the opposite laminated battery faces each other. Will be. Therefore, terminals having different polarities of adjacent laminated batteries can be arranged so that the bent portions face each other, and these terminals can be connected by the bent portions. At this time, the bent portion is arranged parallel to the stacking direction by bending the protruding portion. Thereby, when this laminated battery module is arranged so that the cooling air flows in the stacking direction, the bent portion is arranged in parallel with the cooling air, so that the whole is in contact with the cooling air. Therefore, the cooling efficiency is improved.

Further, in the present invention, each of the laminate battery, it is desirable that the protruding portions of both electrode terminals are located inside each other.
In this way, when the protruding portion of the bipolar terminal is bent, the bent portion becomes a plane parallel to the stacking direction and is disposed inside the extending portion. Therefore, in order for the entire bent portion to come into contact with the cooling air, the cooling air may flow inside the extending portion. Therefore, even if the flow cross-sectional area through which the cooling air flows is small, the laminated battery module has good cooling efficiency.

Furthermore, in the present invention, the bent portion of the bipolar terminal of each laminated battery includes a protruding portion that protrudes forward from the tip of the extended portion of the terminal, and the protruding portion of the bipolar terminal of each laminated battery is connected to the connection partner. It is desirable to be further bent inward together with the protruding portion of the terminal.
In this way, when the cooling air is allowed to flow inside the extended portion, both the bent portion and the protruding portion come into contact with the cooling air. Accordingly, a larger cooling area can be secured with respect to the flow cross-sectional area of the cooling air, so that the cooling efficiency can be further improved.

Furthermore, the present invention relates to a method of manufacturing a laminated battery module in which a plurality of laminated batteries each having a power generation element and a flat bipolar electrode terminal are stacked and connected in series with each other facing down, Some laminated batteries have a bipolar terminal on the same side, and the bipolar terminal has an extended part extending in one direction from the power generation element and a protruding part protruding laterally from the extended part. In addition, the protruding portion of the positive electrode terminal is bent to one side to be a bent portion, and the protruding portion of the negative electrode terminal is bent to the other surface side to be a bent portion (1). (2), (1) Folded to one side to make a bent part, and bent the protruding part of the positive electrode terminal to the other side. The laminated battery module and the laminated battery of (2) turned upside down are alternately stacked, and the laminated battery module for connecting the bent part of the positive terminal of one adjacent laminated battery and the bent part of the negative terminal of the other laminated battery It extends to the manufacturing method.

  According to the laminated battery module and the manufacturing method thereof of the present invention, it is possible to improve the cooling efficiency when the laminated battery modules in which the laminated batteries are stacked and connected are arranged so that cooling air flows in the stacking direction. .

"First form"
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the accompanying drawings. This embodiment is a laminated battery module in which a plurality of lithium ion batteries using a laminated film as an outer package are stacked.

  As shown in FIG. 1, a single lithium ion battery 10 used in the laminated battery module 1 of this embodiment has a positive electrode terminal 13 and a negative electrode terminal 14 projecting from a battery body 12 covered with a laminate film 11. Is provided. Each of the terminals 13 and 14 is a substantially L-shaped flat terminal, and its base is covered with the laminate film 11 together with the battery body 12. Further, of the terminals 13 and 14, the extended portions on the base side are arranged so as to be parallel in substantially the same plane, and the protruding portions protruding laterally therefrom are arranged so as to face each other.

  As shown in FIG. 2, the laminated battery module 1 produced by the lithium ion battery 10 is formed by laminating a plurality of lithium ion batteries 10 with every other lithium ion battery 10 facing down. At this time, the positive electrode terminal 13 and the negative electrode terminal 14 of each lithium ion battery 10 are bent in opposite directions, and the bent parts of adjacent lithium ion batteries 10 are overlapped and connected to each other. .

  Next, a manufacturing procedure for producing a laminated battery module 1 by combining a plurality of lithium ion batteries 10 will be described. First, the protruding portion shown by hatching in FIG. 3 is bent in the opposite direction along a bending line indicated by a one-dot chain line so as to be perpendicular to each terminal surface. At this time, two types of lithium ion batteries 10a and 10b having different bending directions are prepared as shown in FIG. That is, as shown in FIG. 4A, in the lithium ion battery 10a, the bent portion 13a of the positive electrode terminal 13 is bent downward in the drawing, and the bent portion 14a of the negative electrode terminal 14 is bent upward in the drawing. 4B, in the lithium ion battery 10b, the bent portion 13b of the positive electrode terminal 13 is bent upward in the drawing, and the bent portion 14b of the negative electrode terminal 14 is bent downward in the drawing.

  Therefore, when the lithium ion battery 10b is turned upside down on the lithium ion battery 10a, the bent portion 13a of the positive electrode terminal 13 of the lithium ion battery 10a and the bent portion 14b of the negative electrode terminal 14 of the lithium ion battery 10b face each other. . Therefore, the necessary number of the lithium ion batteries 10a and the inside of the lithium ion battery 10b are overlapped in order, and the bent parts 13a and 14b and the bent parts 13b and 14a of the adjacent lithium ion batteries 10 are arranged in contact with each other. When this state is viewed from above, it is as shown in FIG. As a result, one serial connection module is formed as a whole.

  Finally, the laminated battery module 1 is manufactured by joining the contact portions of the bent portions 13a, 13b, 14a, and 14b by ultrasonic welding or the like. When the laminated battery module 1 is arranged so that cooling air flows in the stacking direction, the contact portions of both terminals come into contact with the cooling air as shown in FIG. Therefore, since a sufficiently large cooling area is secured by the terminal, the cooling efficiency is good. Furthermore, since the cooling air only needs to flow between the positive electrode terminal 13 and the negative electrode terminal 14, it is particularly effective when the range and direction in which the cooling air can flow is limited due to other structural limitations. Become.

  As described above in detail, the laminate battery module 1 of the present embodiment is configured by laminating the lithium ion battery 10 having the positive terminal 13 and the negative terminal 14 which are both L-shaped flat terminals. At that time, the protruding portions of the flat plate terminals 13 and 14 of each lithium ion battery 10 are bent, and the bent portions 13a, 13b, 14a, and 14b are alternately connected. When the laminated battery module 1 is arranged so that cooling air flows in the stacking direction, the bent portions 13a, 13b, 14a, and 14b come into contact with the cooling air, so that the cooling area is large. Therefore, the laminated battery module 1 has improved cooling efficiency when the cooling air is arranged to flow in the stacking direction, and the manufacturing method thereof. Furthermore, in this manufacturing method, only the press processing for forming the terminals 13 and 14 and the bending and joining after manufacturing the lithium ion battery 10 are required. It has become a method.

"Second form"
Next, a second embodiment of the present invention will be described in detail with reference to the accompanying drawings. This embodiment is a laminated battery module manufactured by using a terminal having a shape different from that of the lithium ion battery of the first embodiment.

  As shown in FIG. 7, a single lithium ion battery 20 used in the laminate battery module 2 of the present embodiment has a positive electrode terminal 23 and a negative electrode terminal 24 that are flat terminals with respect to a battery body 22 that is covered with a laminate film 21. And are provided. The difference from the first embodiment is that the tip portions of the positive electrode terminal 23 and the negative electrode terminal 24 are formed in a step shape. In other words, the protruding portion shown by hatching in FIG. 7 includes a protruding portion that protrudes further in the distal direction than the extending portion on the base side.

  In the lithium ion battery 20, the protruding portions of the terminals 23 and 24 are first bent in the opposite direction, and then the protruding portion at the tip is bent in the central direction, as shown in FIG. Also in this form, two types with different initial folding directions are created. Then, these two types are alternately laminated face down, and the bent portions of the terminals are joined together. Thereby, as shown in FIG. 9, the laminated battery module 2 is manufactured.

  When the laminated battery module 2 is arranged so that cooling air flows in the stacking direction, the contact portions of the bipolar terminals come into contact with the cooling air, so that the cooling efficiency is good. In particular, when the cooling air is allowed to flow only between the positive electrode terminal 13 and the negative electrode terminal 14, the entire bent portion including the protruding portion becomes a cooling area, so that a larger cooling area than the first embodiment can be secured. .

  As described above in detail, the laminated battery module 2 has a larger cooling area than the laminated battery module 1 of the first embodiment. Therefore, the laminated battery module 2 in which the lithium ion batteries 20 are stacked and connected, and the cooling efficiency when the cooling air flows in the stacking direction is further improved, and the manufacturing method thereof, It has become.

Note that this embodiment is merely an example, and does not limit the present invention. Therefore, the present invention can naturally be improved and modified in various ways without departing from the gist thereof.
For example, in each of the above embodiments, the shape of each terminal is L-shaped or stepped, but is not limited thereto. Any shape that has a protruding portion that protrudes to some extent with respect to the extending portion of the terminal may be used. Alternatively, a method of bending by cutting a part of the terminal may be used.
Further, for example, when the laminated battery module is arranged so that the cooling air is allowed to flow outside the bipolar terminals, the protruding part is provided outside the extending part, and the bent part is formed outside the bipolar terminal. It may be.
Further, for example, the bent portion does not necessarily have to be the entire protruding portion.
Further, for example, when there is a margin in arrangement, the second bending (bending of the protruding portion) of the lithium ion battery 20 of the second form may be omitted.
Further, for example, a configuration in which the flow direction of the cooling air such as a guide can be changed in the cooling air flow passage formed by the bent portion of the terminal so that the cooling air directly hits the bent portion of the terminal. In this way, the cooling efficiency of the battery can be further improved.

It is explanatory drawing which shows the outline of a single-piece | unit lithium ion battery in connection with a 1st form. It is explanatory drawing which shows the outline of the laminated battery module of a 1st form. It is explanatory drawing which shows the procedure which manufactures the laminated battery module of a 1st form. It is explanatory drawing which shows the procedure which manufactures the laminated battery module of a 1st form. It is explanatory drawing which shows the procedure which manufactures the laminated battery module of a 1st form. It is explanatory drawing which shows the outline of the laminated battery module of a 1st form. It is explanatory drawing which shows the outline of a single-piece | unit lithium ion battery in connection with a 2nd form. It is explanatory drawing which shows the procedure which manufactures the laminated battery module of a 2nd form. It is explanatory drawing which shows the outline of the laminated battery module of a 2nd form. It is explanatory drawing which shows the outline of the conventional laminated battery module.

Explanation of symbols

1, 2 Laminated battery module 10, 20 Lithium ion battery (laminated battery)
12 Battery body (power generation element)
13,23 Positive terminal 14,24 Negative terminal

Claims (4)

  1. In a laminated battery module in which a plurality of laminated batteries each having a power generation element and a flat bipolar electrode terminal are stacked and connected in series with each other facing down ,
    Each laminate battery
    Have bipolar terminals on the same side,
    The bipolar terminal has an extending part extending in one direction from the power generation element, and an protruding part protruding laterally from the extending part,
    The protruding part of the bipolar terminal is bent in the opposite direction between the positive terminal and the negative terminal,
    The bent part of the positive terminal is connected to the bent part of the negative terminal of the adjacent laminated battery,
    A laminated battery module, wherein the bent portion of the negative electrode terminal is connected to the bent portion of the positive electrode terminal of the adjacent laminated battery which is opposite.
  2. The laminated battery module according to claim 1,
    Each laminated battery is a laminated battery module characterized in that the protruding portions of the bipolar terminals are located inside each other.
  3. In the laminated battery module according to claim 2,
    The bent portion of each electrode terminal of each laminate battery includes a protruding portion protruding forward from the tip of the extending portion of the terminal,
    A laminated battery module, wherein the protruding portions of the bipolar terminals of each laminated battery are further folded inward together with the protruding portions of the terminals of the connection partner.
  4. In a method of manufacturing a laminated battery module in which a plurality of laminated batteries each having a power generation element and a flat bipolar electrode terminal are stacked and connected in series with each other facing down ,
    A laminated battery having a bipolar terminal on the same side, the bipolar terminal having an extending part extending in one direction from the power generation element and a protruding part protruding laterally from the extending part,
    For some laminated batteries, the protruding portion of the positive electrode terminal is bent to one side to be a bent portion, and the protruding portion of the negative electrode terminal is bent to the other side to be a bent portion (1),
    Regarding the remaining laminated battery, the protruding portion of the negative electrode terminal is bent to one side to be a bent portion, and the protruding portion of the positive electrode terminal is bent to the other side to be a bent portion (2),
    The laminate battery (1) and the laminate battery (2) turned upside down are alternately stacked,
    A method of manufacturing a laminated battery module, comprising connecting a bent portion of a positive electrode terminal of one adjacent laminated battery and a bent portion of a negative electrode terminal of the other laminated battery.
JP2003432360A 2003-12-26 2003-12-26 Laminated battery module and manufacturing method thereof Active JP4617672B2 (en)

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