JP2016136504A - Cell module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cell module in which a laminated plurality of cells is electrically connected in serial, and in which the cells constructing a cell laminate are fixed integrally.SOLUTION: A cell module 100 comprises a cell laminate 101 that includes a collector, laminates a plurality of cells in which a positive electrode terminal plate and a negative electrode terminal plate are extended, and in which the positive electrode terminal plate of one cell and the negative electrode terminal plate of the other adjacent cell are fixed through a connection member. In the cell laminate 101, a positive electrode terminal plate 3a of one cell 1a and a negative electrode terminal plate 4b of the other adjacent cell 1b in a predetermined lamination direction are connected through a conductive first connection member 5, a negative electrode terminal plate 4a of one cell 1a and a positive electrode terminal plate 3b of the other adjacent cell 1b in the predetermined lamination direction are connected through an insulation second connection member 6, and positive electrode terminal plates 3a to 3d and negative electrode terminal plates 4a to 4d of the laminated plurality of cells, the first connection member 5, and the second connection member 6 are integrally fixed by an insulation fixing member 7.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a cell module including a cell laminate in which a plurality of cells including a current collector and a positive electrode terminal plate and a negative electrode terminal plate are stacked.

  As a single cell, for example, a thin cell in which a current collector is encapsulated in a sheet-like packaging member and a positive electrode terminal plate and a negative electrode terminal plate are extended is known. As a battery requiring high voltage and high capacity, an assembled battery in which a plurality of cells are connected in series or in parallel is known.

  In order to form an assembled battery, for example, a cell module in which a plurality of cell units in which two tab-type cells are arranged in parallel has been arranged is proposed (Patent Document 1). Both tab-type cells described in Patent Document 1 have a sheet-like positive electrode terminal and a negative electrode terminal that extend in directions opposite to each other in the direction from the outer peripheral edge of the cell body to the outside. The cell unit described in Patent Document 1 connects the same electrode terminals of terminals of two tab-type cells arranged in parallel by a pair of substantially plate-like bus bars. This bus bar has a through-hole penetrating in the stacking direction of the cell units. The cell module described in Patent Document 1 is a conductive columnar member that penetrates through holes of a plurality of bus bars arranged in the stacking direction and electrically connects bus bars set at the same potential adjacent to each other in the stacking direction. And an insulating columnar member that electrically insulates the bus bars set at different potentials adjacent to each other in the stacking direction. Each of the conductive columnar members and each insulating columnar member has a male screw shape and a female screw shape formed in part. The bus bars adjacent to each other in the stacking direction are fixed by screwing the male screw shape and the female screw shape of the conductive columnar members and the insulating columnar members arranged alternately.

JP 2004-31122 A

  The cell module described in Patent Document 1 is formed by assembling two tab-type cells arranged in parallel to each bus bar to form a cell unit, and then an insulating columnar member penetrated through the bus bar of one cell unit; A plurality of cell units are stacked and arranged by alternately arranging conductive columnar members penetrating through bus bars of other cell units. In the cell module, two adjacent cell units arranged must be fixed to each other by male and female screws of alternately arranged insulating columnar members and conductive columnar members, and the assembly process is complicated. There is a problem that it takes time to manufacture.

  The present invention includes a cell stack including a plurality of cells including a current collector and extending a positive electrode terminal plate and a negative electrode terminal plate, and electrically connects the stacked cells in series. It is an object of the present invention to provide a cell module capable of fixing a plurality of cells constituting a laminated body in a lump.

[1] The present invention includes a plurality of cells including a current collector and extending a positive electrode terminal plate and a negative electrode terminal plate, and negative electrode terminal plates of other cells adjacent to the positive electrode terminal plate of one cell; However, the cell stack includes a positive electrode terminal plate of one cell and a negative electrode terminal plate of another cell adjacent in a predetermined stacking direction. Connected via the first connection member, the negative electrode terminal plate of one cell and the positive electrode terminal plate of another cell adjacent in the predetermined stacking direction are connected via an insulating second connection member, A cell characterized in that a positive terminal plate and a negative terminal plate of a plurality of stacked cells, a first connecting member, and a second connecting member are fixed together by an insulating fixing member. Regarding modules.
[2] In the present invention, the total length of the thickness of the positive electrode terminal plate, the thickness of the negative electrode terminal plate, the length of the first connecting member, and the length of the second connecting member is the thickness of the cell. It is related with the cell module which is 2 times or less.
[3] In the present invention, the fixing member is stacked in the stacking direction of the cell stack from the positive terminal plate or the negative terminal plate at one end in the stacking direction of the cell stack through the first connecting member and the second connecting member. It is related with the cell module provided with the clamping means which clamps and fixes over the lamination direction to the positive electrode terminal plate or negative electrode terminal plate of the other end of.
[4] In the present invention, the fixing member communicates and fixes the positive electrode terminal plate and the negative electrode terminal plate, the first connecting member, and the second connecting member of the plurality of cells of the cell stack. Further, the present invention relates to a cell module in which the fastening length of the fixing member fastened by the fastening means satisfies the following formula (1).
The sum of the connection lengths of the first connection members that communicate with the fixing member + the sum of the connection lengths of the second connection members that communicate with the fixing member + (the thickness of the positive terminal plate that communicates with the fixing members or the negative electrode terminal plate Thickness × (n−1)) ≦ cell thickness × (n−1) (1)
(In formula (1), n is the number of cells.)
[5] In the present invention, the cell current collector has a substantially rectangular shape, and the positive electrode terminal plate and the negative electrode terminal plate extend from one side of the substantially rectangular current collector in the same direction. About.

  In the cell module of the present invention, a positive electrode terminal plate of one cell and a negative electrode terminal plate of another cell adjacent in a predetermined stacking direction are connected via a conductive first connecting member. Since the negative electrode terminal plate and the positive electrode terminal plate of another cell adjacent to each other in the predetermined stacking direction are connected via the insulating second connecting member, the stacked cells are electrically connected in series. Can be connected. In the cell module of the present invention, the positive terminal plate and the negative terminal plate, the first connecting member, and the second connecting member of the plurality of cells stacked by the insulating fixing member are collectively. Since it is fixed, it does not require a complicated assembly process, and has a configuration that can be easily manufactured as compared with the case of assembling the first connection member and the second connection member.

It is a front view which shows the cell module 100 of the 1st embodiment of this invention. 3 is a left side view of the cell module 100. FIG. 2 is a partial cross-sectional view illustrating an internal structure of a cell 1 constituting the cell module 100. FIG. 3 is a partial cross-sectional view illustrating an embodiment of an internal structure of cell 1 constituting cell module 100. FIG. 2 is an exploded perspective view of a cell module 100. FIG. It is a front view which shows the cell module 102 of the 2nd embodiment of this invention. 4 is a left side view of the cell module 102. FIG. 2 is an exploded perspective view of a cell module 102. FIG.

  An embodiment of the cell module of the present invention will be described with reference to FIGS. 1-5 is a figure explaining the 1st embodiment of the cell module of this invention. 6-8 is a figure explaining the 2nd embodiment of the cell module of this invention,

[First Embodiment]
First, the 1st embodiment of the cell module of this invention is described using FIGS. FIG. 1 is an external front view showing a cell module 100 according to a first embodiment of the present invention. FIG. 2 is a side view of the cell module 100 as viewed from the left side to the right. FIG. 3 is a cross-sectional view showing the internal structure of the cell 1. FIG. 4 is a diagram showing another embodiment of the internal structure of the cell 1. FIG. 5 is an exploded perspective view of the cell module 100.

  A cell module 100 shown in FIG. 1 includes a cell stack 101. The cell stack 101 is formed by stacking four cells 1 in the left-right direction. In FIG. 1, the left-right direction of the paper surface is the left-right direction in which the cell stack is stacked. Further, in FIG. 1, the vertical direction of the paper surface is the vertical direction of the cell module. As shown in FIG. 2, one cell 1 constituting the cell module 100 includes a package 2 in which a current collector is included, a positive terminal plate 3, and a negative terminal plate 4. In FIG. 2, the vertical direction of the paper surface is the vertical direction of the cell module. The current collector not shown in FIG. 2 is preferably substantially rectangular. Details of the current collector contained in the package 2 will be described later. As shown in FIGS. 1 and 2, the positive electrode terminal plate 3 and the negative electrode terminal plate 4 are extended from the package 2 to the outside in the same direction from one side of a substantially rectangular current collector. In FIG. 1, the positive electrode terminal plate 3 and the negative electrode terminal plate 4 are both extended upward in the same direction. The package 2 is preferably formed by forming a sheet-like member such as a laminate film into a substantially rectangular bag shape in accordance with the shape of a substantially rectangular current collector. In this specification, as shown in FIG.1 and FIG.2, the positive electrode terminal plate 3 and the negative electrode terminal plate 4 are the same in the direction which leaves | separates from a collector from the same side which is a predetermined one side of a substantially rectangular current collector. The cell 1 extending in the direction is referred to as a one-side terminal type cell.

  As shown in FIG. 1, in the cell module 100, in the plurality of cells 1, the positive terminal plates 3 and the negative terminal plates 4 are alternately arranged in the left-right direction. Between the positive electrode terminal board 3 and the negative electrode terminal board 4, the electroconductive 1st connection member 5 and the insulating 2nd connection member 6 are arrange | positioned alternately. The positive electrode terminal plate 3 and the negative electrode terminal plate 4, and the conductive first connecting member 5 and the insulating second connecting member 6 are arranged in direct contact with each other. The positive electrode terminal plate 3, the negative electrode terminal plate 4, the conductive first connection member 5, and the insulating second connection member 6 of the cell 1 stacked in the left-right direction are fastened by a fixing member 7 and a fastening member 8. Fixed. Thereby, the cell module 100 in which the plurality of cells 1 are stacked and fixed is formed. The detailed arrangement and structure of each member in the cell module 100 will be described later. The cell 1 is formed by enclosing a current collector described later in a package 2. A plurality of cells 1 are stacked to form a cell stack 101.

  Next, the internal structure of the cell 1 will be described with reference to FIG. FIG. 3 is a sectional view showing a part of the sectional structure of the cell 1 on the positive electrode terminal plate 3 side. 3 is a cross-sectional view in which the position where the positive electrode terminal plate 3 of the cell 1 is disposed is cut in the vertical direction indicated by the line XX in FIG. 2 and the cut surface is viewed from the front. In FIG. 3, the vertical direction of the paper surface is the vertical direction of the cell 1. In FIG. 3, illustration of a part of the positive electrode terminal plate 3 and a part of the current collector and the package 2 which are the lower part of the cell 1 is omitted. A cell 1 shown in FIG. 3 includes a positive electrode 19 and a negative electrode 20.

  As shown in FIG. 3, the positive electrode 19 includes a positive electrode current collector 15 and a positive electrode active material layer 17 laminated on both surfaces or one surface of the positive electrode current collector 15. The positive electrode current collector 15 is connected to the positive electrode terminal plate 3.

  As shown in FIG. 3, the negative electrode 20 includes a negative electrode current collector 16 and a negative electrode active material layer 18 laminated on both surfaces or one surface of the negative electrode current collector 16. The negative electrode current collector 16 is connected to the negative electrode terminal plate 4 (not shown). The positive electrode current collector 15 and the negative electrode current collector 16 are preferably plate-shaped bodies having a substantially rectangular plane. In addition, although illustration is abbreviate | omitted, the cross-section of the position where the negative electrode terminal board 4 of the cell 1 is arrange | positioned is the position where the positive electrode terminal board 3 shown in FIG. Similarly, in the cross-section viewed from the front and viewed from the front, the negative electrode terminal plate 4 is disposed in place of the positive electrode terminal plate 3 at the position of the positive electrode terminal plate 3 shown in FIG. The cross-sectional structure of the positive electrode terminal plate 3 shown in FIG. 3 is the same as that of the positive electrode terminal plate 3 except that the negative electrode current collector 16 is connected to the negative electrode terminal plate 4 instead of the positive electrode current collector 15.

  As shown in FIG. 3, the positive electrode 19 and the negative electrode 20 included in the package 2 of the cell 1 have a configuration in which separators 21 are interposed between the positive electrode 19 and the negative electrode 20 and are alternately stacked.

  As shown in FIG. 3, the positive electrode terminal plate 3 or the negative electrode terminal plate (not shown) is disposed at the position of the center line A in the thickness direction of the cell 1 in which the positive electrode 19 and the negative electrode 20 are laminated.

  The positive electrode terminal plate 3 and the negative electrode terminal plate 4 of the cell 1 do not have to be arranged at the position of the center line A of the cell 1 as shown in FIG. FIG. 4 is a partial cross-sectional view showing a cross-sectional structure in which the position where the positive electrode terminal plate 3 of the one-side terminal type cell 1 ′ is arranged is cut in the vertical direction indicated by line XX in FIG. 2. In FIG. 4, the vertical direction of the paper surface is the vertical direction of the cell 1 '. The cell 1 'shown in FIG. 4 shows another embodiment different from the cell 1 in FIG. As shown in FIG. 4, the positive electrode terminal plate 3 and the negative electrode terminal plate 4 of the cell 1 ′ are the same as the positive electrode terminal plate 3 and the negative electrode terminal plate 4 as shown in FIG. It may be arranged at a position deviated from the center line A in the thickness direction.

  The cross-sectional structure of the cell 1 ′ shown in FIG. 4 is the same as that of the cell 1 ′ shown in FIG. 3 except that the positive electrode terminal plate 3 and the negative electrode terminal plate 4 are arranged at positions offset from the center line A of the cell 1 ′. This is the same as the cross-sectional structure. Similar to the cell 1 shown in FIG. 3, a positive electrode 19 and a negative electrode 20 are provided. The positive electrode 19 includes a positive electrode current collector 15 which is a plate-like body having a substantially rectangular plane. The negative electrode 20 includes a negative electrode current collector 16 which is a plate-like body having a substantially rectangular plane. The positive electrode active material layer 17 is laminated on both surfaces or one surface of the positive electrode current collector 15. The negative electrode active material layer 18 is laminated on both sides or one side of the negative electrode current collector 16. The positive electrode 19 and the negative electrode 20 are alternately stacked with the separator 21 interposed between the positive electrode 19 and the negative electrode 20. The positive electrode current collector 15 is connected to the positive electrode terminal plate 3. The negative electrode current collector 16 is connected to the negative electrode terminal plate 4 (not shown in FIG. 4). In the cell 1 ′, the positive electrode terminal plate 3 and the negative electrode terminal plate 4 are arranged at positions offset from the center line A in the thickness direction of the cell 1 ′ in which the positive electrode 19 and the negative electrode 20 are stacked. For example, as shown in FIG. 4, the positive electrode terminal plate 3 and the negative electrode terminal plate 4 are arranged to be shifted to the left side from the center line A.

  The material of the electronic component that constitutes the cell other than the current collector is not particularly limited. Depending on the type of battery, the positive electrode terminal plate 3, the negative electrode terminal plate 4, the positive electrode current collector 15, the negative electrode current collector 16, the positive electrode active material 17, the negative electrode active material 18, the separator 21, and the package 2 are configured. The material for the sheet-like member can be selected as appropriate. Examples of the battery include a lithium ion secondary battery and a vanadium battery. The cell which comprises the cell module used as various batteries may contain electrolyte solution as needed.

  When the type of the battery is a lithium ion secondary battery, the positive electrode terminal plate 3 can use aluminum, an aluminum alloy, or the like. In the case of a lithium ion secondary battery, the negative electrode terminal plate can use copper, a copper alloy, or the like. The positive electrode current collector 15 can be made of an aluminum foil or the like. The negative electrode current collector 16 can be made of copper foil or the like. As the separator 21, a nonwoven fabric made of resin or glass fiber, a woven fabric, a microporous film, or the like can be used.

  When the type of battery is a vanadium battery, the positive electrode terminal plate 3 or the negative electrode terminal plate 4 uses any one metal plate made of aluminum, aluminum alloy, copper and copper alloy, nickel and nickel alloy. Can do. The positive electrode current collector 15 or the negative electrode current collector 16 uses at least one selected from the group consisting of carbon felt, a carbon sheet made of carbon fiber, a sheet containing activated carbon, and a sheet-like glassy carbon. be able to. The positive electrode active material or the negative electrode active material is preferably a precipitate containing a solid compound containing vanadium ions or a cation containing vanadium as an active material. As the separator 21, a separator capable of passing hydrogen ions (protons) can be used. For example, the separator 21 may be an ion exchange membrane that can selectively permeate hydrogen ions. The cell module of the present invention is preferably used for a vanadium secondary battery. When power is repeatedly generated like a vanadium secondary battery, the cell 1 repeats expansion and contraction. In addition, when the cell 1 is expanded, the shape of the expanded cell 1 varies depending on the individual, and does not always expand uniformly in the left-right direction around the center line A. Therefore, the positive electrode terminal plate 3 and the negative electrode terminal plate 4 of each cell 1 may be displaced in the left-right direction due to the degree of expansion of the stacked cells 1. Even in such a case, the positive electrode terminal plate 3 and the negative electrode terminal plate 4 are directly connected to the conductive connection member 5 and the insulating connection member 6, and the positive electrode terminal plate 3 and the negative electrode terminal plate 4. And the conductive connecting member 5 and the insulating connecting member 6 disposed between the positive electrode terminal plate 3 and the negative electrode terminal plate 4 are fixed by the fixing member 7 and the fastening member 8. 3 and the negative electrode terminal plate 4 can be prevented from being displaced, and the positive electrode terminal plate 3 and the negative electrode terminal plate 4 can be prevented from being damaged.

  Examples of the sheet-like member constituting the package 2 include a laminate film having a three-layer structure including an inner surface layer, an intermediate layer, and an outer surface layer. For the inner surface layer, a thermoplastic resin excellent in electrolytic solution resistance and heat sealability such as polyethylene, polypropylene, and polyamide can be used. For the intermediate layer, a metal foil having excellent flexibility and strength, such as aluminum foil and stainless steel foil, can be used. For the outer surface layer, an insulating resin excellent in electrical insulation such as a polyamide resin or a polyester resin can be used.

  FIG. 5 is an exploded perspective view of the cell module 100. In FIG. 5, the vertical direction of the paper surface is the left-right direction of the cell module 100. In FIG. 5, the left-right direction of the paper surface is the vertical direction of the cell module 100.

  As shown in FIG. 5, the cell module 100 includes a cell stack 101. In the cell laminate 101, four cells 1a to 1d obtained by extending the positive electrode terminal plates 3a to 3d and the negative electrode terminal plates 4a to 4d from the package 2 containing the current collector are laminated.

  As shown in FIG. 5, the cell module 100 is obtained by stacking the four one-sided terminal cells 1a to 1d shown in FIGS. A negative electrode terminal plate 4b of one cell 1b and a positive electrode terminal plate 3c of another cell 1c adjacent in a predetermined stacking direction are connected via an insulating second connection member 6. A positive electrode terminal plate 3b of one cell 1b and a negative electrode terminal plate 4c of another cell 1c adjacent in a predetermined stacking direction are connected via a conductive first connection member 5. Thus, in the cell module 100, the positive electrode terminal plate 3 of one cell and the negative electrode terminal plate 4 of another cell adjacent in a predetermined stacking direction are connected via the conductive first connection member 5. Is done. In the cell module 100, the negative electrode terminal plate 4 of one cell and the positive electrode terminal plate 3 of another cell adjacent in the predetermined stacking direction are connected via an insulating second connection member 6. .

  The positive electrode terminal plates 3a to 3d and the negative electrode terminal plates 4a to 4d of the cells 1a to 1d have holes 30 for allowing the fixing member 7 to communicate with each other. The first connecting member 5 and the second connecting member 6 are circular tube members that can communicate with the fixing member 7. The conductive first connection member 5 is formed using a conductive material such as copper. The insulating second connection member 6 is formed using an electrically insulating material such as resin. The cell module 100 includes a hole 30 provided in each of the positive electrode terminal plates 3a to 3d and the negative electrode terminal plates 4a to 4d of the plurality of stacked cells 1a to 1d, the first connection member 5, and the second Insulating fixing members 7 are penetrated into the circular pipes of the respective connecting members with the connecting members 6 and fixed together by the fixing members 7 and the fastening members 8. The diameters of the hole portions 30 of the positive electrode terminal plate 3 and the negative electrode terminal plate 4 are larger than the diameter of the fixing member 7, and the inner diameters of the first connecting member 5 and the second connecting member 6 are larger. The fixing member 7 includes the holes 30 of the positive electrode terminal plates 3a to 3d and the negative electrode terminal plates 4a to 4d of the plurality of cells 1a to 1d, the circular tube of the first connection member 5, and the circle of the second connection member 6. It is a bolt having a length that can be communicated with a tube. The fixing member 7 is formed of an electrically insulating material such as resin.

  In the cell module 100, since the plurality of cells 1a to 1d, the first connection member 5, and the second connection member 6 are fixed together by the fixing member 7, no complicated assembly process is required. The first connection member and the second connection member can be easily manufactured as compared with the case where the first connection member and the second connection member are assembled. If a failure occurs in the cells that make up the cell module, remove the fixing member that fixes multiple cells at once, replace the failed cell with another cell, and then fix the multiple cells again. It can be fixed together with a member. In the cell module of the present invention, a plurality of cells can be easily assembled, and cells can be easily replaced.

  As shown in FIG. 5, the cell module 100 includes a positive electrode terminal plate 3a of one cell 1a and negative electrode terminal plates 4b of other cells 1b adjacent to each other in a predetermined stacking direction that is the right direction in the first embodiment. Are connected via the conductive first connecting member 5 and the negative electrode terminal plate 4a of one cell 1a and the other cell 1b adjacent to the predetermined stacking direction which is the right direction in the first embodiment. Since the positive electrode terminal plate 3b is connected via the insulating second connection member 6, the stacked cells 1a to 1d can be electrically connected in series.

  The fixing member 7 is stacked in the stacking direction of the cell stack 101 from the positive terminal plate 3a or the negative terminal plate 4a at one end in the stacking direction of the cell stack 101 via the first connecting member 5 and the second connecting member 6. The other end of the positive electrode terminal plate 3d or the negative electrode terminal plate 4d is configured as a pair with a fastening member 8 that is fastened and fixed in the stacking direction. The fixing member 7 and the fastening member 8 constitute fastening means. For example, when the fixing member 7 is a bolt, the fastening member 8 is preferably a nut having a female screw that is screwed into a male screw of the bolt.

  In the cell module 100, the total length of the thickness of the positive electrode terminal plate 3, the thickness of the negative electrode terminal plate 4, the length of the first connection member 5, and the length of the second connection member 6 is It is preferable that the thickness is 2 times or less. The total length of the thickness of the positive electrode terminal plate 3, the thickness of the negative electrode terminal plate 4, the length of the first connection member 5, and the length of the second connection member 6 is 2 of the thickness of the cell 1. If it is less than double, the stacked cells 1 are fixed intimately by the fixing member 7 and the fastening member 8, and the cell module 100 can be downsized and the volume energy density can be increased.

The fixing member 7 communicates the positive electrode terminal plates 3 a to 3 d and the negative electrode terminal plates 4 a to 4 d of the plurality of cells 1 a to 1 d of the cell stack 101, the first connection member 5, and the second connection member 6. It is preferable that they are fixed. It is preferable that the fastening length of the fixing member 7 fastened by the fastening member 8 satisfies the following formula (1).
The sum of the connection lengths of the first connection members that communicate with the fixing member + the sum of the connection lengths of the second connection members that communicate with the fixing member + (the thickness of the positive terminal plate that communicates with the fixing members or the negative electrode terminal plate Thickness × (n−1)) ≦ cell thickness × (n−1) (1)
(In formula (1), n is the number of cells.)

  In the cell module 100, when the fastening length of the fixing member 7 satisfies the formula (1), each cell 1 is fixed in close contact with the cell module 100, the cell module 100 is downsized, and the volume energy density is increased. be able to.

  For example, as shown in FIG. 3, when the positive electrode terminal plate 3 or the negative electrode terminal plate 4 is formed by laminating the cells 1 arranged at positions that coincide with the center line A in the thickness direction of the cells 1, The length of the connecting member 5 and the length of the second connecting member 6 are the same length. In the case where a cell in which the positive electrode terminal plate 3 or the negative electrode terminal plate 4 is arranged at the position of the center line in the thickness direction of the cell 1 is used, even number of cells 1 are stacked even when odd number of cells 1 are stacked. The cell module 100 has a thickness of the positive electrode terminal plate 3, a thickness of the negative electrode terminal plate 4, a length of the first connection member 5, and a length of the second connection member 6. Can be formed so that the total length is less than twice the thickness of the cell 1.

  When the cell 1 in which the positive electrode terminal plate 3 or the negative electrode terminal plate 4 is arranged at the position of the center line A in the thickness direction of the cell is used, even number of cells 1 may be stacked Even when 1 is laminated, the cell module 100 can be formed such that the fastening length of the fixing member 7 satisfies the formula (1).

  For example, as shown in FIG. 4, when the cell 1 ′ uses a cell in which the positive electrode terminal plate or the negative electrode terminal plate is disposed at a position deviated from the center line A in the thickness direction of the cell 1 ′, In some cases, the length of the first connecting member 5 and the length of the second connecting member 6 are different. The cell module 100 in which the positive electrode terminal plate 3 or the negative electrode terminal plate 4 is disposed at a position deviated from the center line in the thickness direction of the cell 1 includes the thickness of the positive electrode terminal plate 3, the thickness of the negative electrode terminal plate 4, and the first The total length of the connection member 5 and the second connection member 6 may not be less than twice the thickness of the cell 1 ′.

  In the case where an odd number of cells 1 ′ arranged at positions where the positive electrode terminal plate 3 or the negative electrode terminal plate 4 is offset from the center line A in the thickness direction of the cell 1 ′ are stacked, they are fixed together by a fixing member 7. The number of first connecting members 5 and the number of second connecting members 6 are the same. When the positive terminal plate 3 or the negative electrode terminal plate 4 is stacked with an odd number of cells 1 ′ arranged at a position deviated from the center line A in the thickness direction of the cell 1 ′, the cell module 100 has a fastening length of the fixing member 7. Can be formed to satisfy the formula (1). On the other hand, in the case where an even number of cells 1 ′ arranged such that the positive electrode terminal plate 3 or the negative electrode terminal plate 4 is offset from the center line A in the thickness direction of the cell 1 ′ are stacked, the cell module 100 includes the fixing member 7. May not be formed so that the tightening length satisfies the formula (1). When an even number of cells 1 ′ in which the positive electrode terminal plate 3 or the negative electrode terminal plate 4 is disposed at a position deviated from the center line A in the thickness direction of the cells are stacked, the first member fixed together by the fixing member 7. This is because the number of connecting members 5 and the number of second connecting members 6 are different, and the length of the first connecting member 5 and the length of the second connecting member 6 are different.

  The fixing member 7 includes an elongated flat plate-like member having a length longer than the thickness of the cell laminate 101, and the positive electrode terminal plate 3 at one end in the stacking direction of the cell laminate 101 or the end of the flat plate member. A U-shape comprising a first plate-like portion facing the negative electrode terminal plate 4 and a second plate-like portion facing the positive electrode terminal plate 3 or the negative electrode terminal plate 4 at the other end in the stacking direction of the cell laminate 101. It may be a shaped member. The U-shaped member preferably has a hole for communicating a bolt with at least one of the first plate or the second plate. When the fixing member is a U-shaped member, examples of the fastening member include a bolt and a nut. As a fastening member, a bolt is connected to the first plate-like body or the second plate-like body of the U-shaped member, and this bolt is protruded in the stacking direction of the cell laminate 101 and fixed with a nut. The cell laminate 101 may be clamped and fixed by the protruding length of the cell laminate in the stacking direction.

[Second Embodiment]
Next, a second embodiment of the cell module of the present invention will be described with reference to FIGS. FIG. 6 is an external front view showing the cell module 102 according to the second embodiment of the present invention. In FIG. 6, the vertical direction of the paper surface is the vertical direction of the cell module 102. In FIG. 6, the horizontal direction of the paper surface is the horizontal direction of the cell module 102. FIG. 7 is a side view of the cell module 102 as viewed from the left side surface in the right direction. In FIG. 7, the vertical direction of the paper surface is the vertical direction of the cell module 102. FIG. 8 is an exploded perspective view of the cell module 102. In FIG. 8, the vertical direction of the paper surface is the horizontal direction of the cell module 102. In FIG. 8, the horizontal direction of the paper surface is the vertical direction of the cell module 102.

As shown in FIG. 6, the cell module 102 includes a cell stack 103. The cell laminate 103 includes a current collector, and four cells 10a to 10d in which the positive terminal plates 13a to 13d and the negative terminal plates 14a to 14d extend in opposite directions are stacked in the left-right direction.
As shown in FIGS. 6 and 7, one cell 10 constituting the cell module 102 includes a package 12 containing a current collector, a positive terminal plate 13, and a negative terminal plate 14. The current collector not shown in FIG. 6 is preferably substantially rectangular. As shown in FIG. 7, the cell 10 has a positive terminal plate 13 extending from one side of a substantially rectangular current collector. In the cell 10, a negative electrode terminal plate 14 is extended in the opposite direction of the positive electrode terminal plate 13 from the opposite side of the current collector from which the positive electrode terminal plate 13 is extended. The package 12 is preferably formed by forming a sheet-like member such as a laminate film into a rectangular bag shape in accordance with the shape of a substantially rectangular current collector. In the cell 10, a positive terminal plate 13 and a negative terminal plate 14 extend in opposite directions from each of two opposing sides of a substantially rectangular current collector. In the cell 10 shown in FIGS. 6 and 7, the positive electrode terminal plate 13 or the negative electrode terminal plate 14 extends in the opposite direction from the current collector in the vertical direction. In the present specification, the cell 10 in which the positive electrode terminal plate 13 and the negative electrode terminal plate 14 extend in opposite directions from each of the two opposing sides of the rectangular current collector is referred to as a double-sided terminal type cell. The cell 10 is not limited to the double-sided terminal cell embodiment shown in FIGS.

  Although not shown, even in the case of a double-sided terminal type cell, the internal structure of the cell is the same as the one-side terminal-side cell whose internal structure has been described with reference to FIGS. The positive electrode current collector and the negative electrode current collector are preferably plate-shaped bodies having a substantially rectangular plane. Also in the double-sided terminal cell, the positive electrode and the negative electrode have the same structure as the single-sided terminal cell. The positive electrode includes a positive electrode current collector and a positive electrode active material. The negative electrode includes a negative electrode current collector and a negative electrode active material. In the double-sided terminal type cell, a positive electrode terminal plate extends in a predetermined direction from one side of a rectangular positive electrode current collector. In the double-sided terminal type cell, the negative electrode terminal plate 14 extends from one side of the rectangular negative electrode current collector in a direction opposite to a predetermined direction in which the positive electrode terminal plate 13 extends. The positive electrode current collector is connected to the positive electrode terminal plate 13, and the negative electrode current collector is connected to the negative electrode terminal plate 14.

  As shown in FIG. 8, the cell module 102 is obtained by stacking the four double-sided terminal cells 10a to 10d shown in FIG. The positive electrode terminal plate 13a of one cell 10a and the negative electrode terminal plate 14b of another cell 10b adjacent to each other in a predetermined stacking direction are connected via the conductive first connection member 5. The negative electrode terminal plate 14a of one cell 10a and the positive electrode terminal plate 13b of another cell 10b adjacent in the predetermined stacking direction are connected via the insulating second connection member 6. Thus, in the cell module 102, the positive electrode terminal plate of one cell and the negative electrode terminal plates of other cells adjacent in a predetermined stacking direction are connected via the conductive first connecting member 5. . In the cell module 102, a negative electrode terminal plate of one cell and a positive electrode terminal plate of another cell adjacent in a predetermined stacking direction are connected via an insulating second connection member 6.

  The positive terminal plates 13a to 13d and the negative terminal plates 14a to 14d of the cells 10a to 10d have holes 40 for allowing the fixing member 7 to communicate with each other. The first connecting member 5 and the second connecting member 6 are circular tube members that can communicate with the fixing member 7. The conductive first connection member 5 can be formed using a conductive material such as copper. The insulating second connection member 6 can be formed using an electrically insulating material such as resin. The cell module 102 includes positive electrode terminal plates 13a to 13d of a plurality of stacked cells 10a to 10d and The insulating fixing member 7 penetrates through the hole 40 provided in each of the negative electrode terminal plates 14a to 14d, the first connecting member 5, and the circular pipe of each connecting member of the second connecting member 6. The fixing member 7 and the fastening member 8 are collectively fixed. The diameters of the hole portions 40 of the positive electrode terminal plate 13 and the negative electrode terminal plate 14 are larger than the diameter of the fixing member 7, and the inner diameters of the circular tubes of the first connection member 5 and the second connection member 6 are larger. The fixing member 7 includes the holes 40 of the positive terminal plates 13a to 13d and the negative terminal plates 14a to 14 of the plurality of cells 10a to 10d, the circular tube of the first connecting member 5, and the circle of the second connecting member 6. It is a bolt having a length that can be communicated with a tube. The fixing member 7 is formed of an electrically insulating material such as resin.

  In the cell module 102, since the plurality of cells 10a to 10d, the first connection member 5, and the second connection member 6 are fixed together by the fixing member 7, a complicated assembly process is not required. The first connection member and the second connection member can be easily manufactured as compared with the case where the first connection member and the second connection member are assembled.

  As shown in FIG. 8, the cell module 102 includes a positive terminal plate 13a of one cell 10a and negative terminal plates 14b of other cells 10b adjacent to each other in a predetermined stacking direction that is the right direction in the second embodiment. Are connected via the conductive first connection member 5. In the cell module 102, the negative electrode terminal plate 14a of one cell 10a and the positive electrode terminal plate 13b of another cell 10b adjacent to the predetermined stacking direction which is the right direction in the second embodiment are insulated. It is connected via the second connection member 6. The cell module 102 can electrically connect the stacked cells 10 a to 10 d in series by the first connection member 5 and the second connection member 6.

  The fixing member 7 is stacked in the stacking direction of the cell stack 103 from the positive terminal plate 13a or the negative terminal plate 14a at one end in the stacking direction of the cell stack 103 via the first connecting member 5 and the second connecting member 6. It is preferable to provide a fastening member 8 that fastens and fixes the positive electrode terminal plate 13d or the negative electrode terminal plate 14d at the other end in the stacking direction. The fixing member 7 and the fastening member 8 constitute fastening means. For example, when the fixing member 7 is a bolt, the fastening member 8 is preferably a nut having a female screw that is screwed into a male screw of the bolt.

  In the cell module 102, the total length of the thickness of the positive electrode terminal plate 13, the thickness of the negative electrode terminal plate 14, the length of the first connection member 5, and the length of the second connection member 6 is It is preferable that the thickness is 2 times or less. The total length of the thickness of the positive electrode terminal plate 13, the thickness of the negative electrode terminal plate 14, the length of the first connection member 5, and the length of the second connection member 6 is 2 of the thickness of the cell 10. If it is less than or equal to twice, the stacked cells 10 are fixed intimately by the fixing member 7 and the fastening member 8, and the cell module 102 can be downsized and the volume energy density can be increased.

In the cell module 102, the fixing member 7 includes the positive terminal plates 13 a to 13 d and the negative terminal plates 14 a to 14 d of the plurality of cells 10 a to 10 d of the cell stack 102, the first connecting member 5, and the second connecting member. 6 is preferably connected and fixed. The cell module 102 preferably has a fastening length that is fastened by the fastening member 8 of the fixing member 7 that satisfies the following formula (1). The sum of the connection lengths of the first connection members that communicate with the fixing member + the sum of the connection lengths of the second connection members that communicate with the fixing member + (the thickness of the positive terminal plate that communicates with the fixing members or the negative electrode terminal plate Thickness × (n−1)) ≦ cell thickness × (n−1) (1)
(In formula (1), n is the number of cells.)

  In the cell module 102, when the fastening length of the fixing member 7 satisfies the formula (1), the cells 10 are closely fixed, and the cell module 102 can be downsized and the volume energy density can be increased.

  The present invention is capable of electrically connecting a plurality of stacked cells in series in a cell module including a cell stack in which a plurality of cells are stacked and arranged. Moreover, since each cell which comprises a cell laminated body is fixed collectively by a fixing member, the cell module of this invention does not require a complicated assembly process, but it is the 1st connection member for every two cells. And the second connecting member can be easily manufactured as compared with the case where the second connecting member is assembled. The cell module of the present invention can fix each cell closely, miniaturize the cell module, and increase the volume energy density. Since the cell module of the present invention is small and easy to manufacture, it can be used for a battery that requires high voltage and high capacity, and is industrially useful.

1,1 'cell (single terminal type cell)
2,12 Package 3,13 Positive terminal plate 4,14 Negative terminal plate 5 First connection member 6 Second connection member 7 Fixing member 8 Tightening means 10 cell (double-sided terminal type cell)
DESCRIPTION OF SYMBOLS 15 Current collector for positive electrodes 16 Current collector for negative electrodes 17 Positive electrode active material layer 18 Negative electrode active material layer 19 Positive electrode 20 Negative electrode 21 Separator 30, 40 Hole 100, 102 Cell module 101, 103 Cell laminate

Claims (5)

A plurality of cells including the current collector and extending the positive electrode terminal plate and the negative electrode terminal plate are stacked, and the positive electrode terminal plate of one cell and the negative electrode terminal plate of another cell adjacent to each other are connected via a connecting member. A cell stack to be fixed,
The cell laminate is
A positive electrode terminal plate of one cell and a negative electrode terminal plate of another cell adjacent to each other in a predetermined stacking direction are connected via a conductive first connecting member,
The negative electrode terminal plate of the one cell and the positive electrode terminal plate of another cell adjacent in the predetermined stacking direction are connected via an insulating second connecting member,
The positive terminal plate and the negative terminal plate of the plurality of cells stacked, the first connecting member, and the second connecting member are fixed together by an insulating fixing member. A cell module.   The total length of the thickness of the positive electrode terminal plate, the thickness of the negative electrode terminal plate, the length of the first connecting member, and the length of the second connecting member is not more than twice the thickness of the cell. The cell module according to claim 1, wherein   The fixing member is connected to the other of the cell stack in the stacking direction from the positive terminal plate or the negative terminal plate at one end in the stacking direction of the cell stack through the first connecting member and the second connecting member. 3. The cell module according to claim 1, further comprising a fastening unit that fastens and fixes the positive electrode terminal plate or the negative electrode terminal plate at the end in the stacking direction. The fixing member communicates and fixes the positive terminal plate and the negative terminal plate of the plurality of cells of the cell stack, the first connecting member, and the second connecting member. ,
The cell module according to claim 3, wherein a fastening length of the fixing member fastened by the fastening means satisfies the following formula (1).
The sum of the connection lengths of the first connection members communicated with the fixing member + the sum of the connection lengths of the second connection members communicated with the fixing members + (the thickness of the positive terminal plate through which the fixing members communicate) Or thickness of negative electrode terminal plate × (n−1)) ≦ cell thickness × (n−1) (1)
(In formula (1), n is the number of cells.)   The current collector of the cell is substantially rectangular, and the positive electrode terminal plate and the negative electrode terminal plate are extended from one side of the substantially rectangular current collector in the same direction. 5. The cell module according to any one of 4 above.