JP3511509B2 - Cell module structure and cell connection members - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a cell module mounted on an electric vehicle, a hybrid electric vehicle or the like as a driving power source and a cell connecting member. The cell referred to in the present invention includes all electric storage elements such as single cells such as nickel hydrogen and lithium batteries, and energy storage elements such as electric double layer capacitors (ultracapacitors).

[0002]

2. Description of the Related Art As a cell module in which a plurality of cells are connected in series, for example, a plurality of cylindrical or rectangular parallelepiped cells each having a positive electrode terminal and a negative electrode terminal arranged side by side are installed in parallel, An example is a positive electrode terminal and a negative electrode terminal connected in series via a bus bar and connected. When assembling such a cell module, a bus bar is generally attached to a terminal by bolt connection or nut connection.

FIG. 12 shows an example of a cell 100 and a bus bar 110 which constitute a conventional cell module. In this case, the positive electrode terminal 101 and the negative electrode terminal 102 are juxtaposed on one end surface of the cylindrical cell 100, and the positive electrode side bus bar 1 insulated from each other in the bus bar 110 is provided.
11 and bolts 120, 1 passed through the negative bus bar 112
20 is screwed and fastened to the positive electrode terminal 101 and the negative electrode terminal 102, respectively, and connected in series.

[0004]

In the conventional cell module in which a plurality of cells are connected in series on the basis of the connection form shown in FIG. 12, the terminals are connected to each other by the busbars. The work such as fastening was repeated, and further, two bus bars were required for one cell to connect the cells except the cells at both ends. For this reason,
Connection work is extremely time-consuming, and in addition to fastening a bolt, a wide working space is required to operate the fastening tool, and consideration must be given to avoiding a short circuit due to the fastening tool. , The connection work was complicated.

Further, in order to reduce the connection resistance, it is necessary to strengthen the connection between the terminals and the bus bar, but the load applied to the connection portion increases due to deformation due to vibration or temperature change. Could adversely affect the connection status. Further, in a cell in which a positive electrode terminal and a negative electrode terminal are arranged side by side at one end, the occupied area of the cell and the cell module as a whole tends to be large, and in a vehicle that is required to effectively utilize a limited space,
It is a disadvantageous structure.

Further, although the shape of the positive electrode terminal and the negative electrode terminal is changed to prevent misassembly in which the positive electrode terminals are connected to each other or the negative electrode terminal is connected, the terminals are often projections in many cases. , It was not possible to completely prevent misassembly. In addition, since the terminals are protrusions, there is a risk that they may be mishandled and damaged, resulting in failure of sufficient electrical contact or short-circuiting.

Therefore, an object of the present invention is to provide a cell module structure satisfying the following items. The cells can be easily connected in series and the resistance can be reduced. The cells can be precisely laid out and space can be effectively used. Wrong assembly and short circuit can be prevented.

[0008]

The cell module structure of the present invention is a cell module structure in which a plurality of cylindrical cells arranged in parallel are connected in series via a connecting member, and one end of the cell is An outer terminal and an inner terminal having polarities different from each other are coaxially arranged, and a connecting member includes a holder for holding the cell by engaging the outer terminal of the cell, an inner bus bar corresponding to the inner terminal of the cell, and a cell. And an outer bus bar corresponding to the outer terminal of and connected to the inner bus bar of an adjacent cell, and as the outer terminal is engaged with the holder of the connecting member, the outer terminal contacts the outer bus bar and the inner side The terminals come into contact with the inner busbars, the connecting members are attached to one cell, and the outer busbars and the inner busbars of the connecting members attached to the adjacent cells are connected to each other so that the cells are directly connected. Characterized in that it is connected.

According to this structure, the outer terminal and the inner terminal having different polarities are arranged at one end of the cell, and one of these terminals is a positive electrode and the other is a negative electrode. To construct the cell module, the outer terminals of the cell are engaged with the holder of the connecting member. As a result, the outer terminal comes into contact with the outer bus bar and the inner terminal comes into contact with the inner bus bar, so that the connecting member is attached to one cell. Then, by connecting the outer bus bar and the inner bus bar of the connecting member attached to each adjacent cell, the cells are connected in series.

According to the present invention, by engaging the outer terminal of the cell with the holder of the connecting member, the outer terminal and the inner terminal of the cell come into contact with the outer bus bar and the inner bus bar of the connecting member, respectively, and they are adjacent to each other via these bus bars. It is a structure that transfers the electric power to the cell. For this reason, the contact surface pressure of each terminal with respect to each bus bar can be sufficiently secured, and the power transmission distance is also extremely short, so that the resistance can be significantly reduced. Further, since the rigidity of the connected state can be increased by the engagement, the connected state is firmly held and the resistance reduction is promoted.

Further, since the cell can be attached to the connecting member only by engaging the outer terminal of the cell with the holder of the connecting member, a fastening member such as a bolt or a nut and a fastening tool are not required for the attachment. . As a result, the connection work can be performed extremely easily. Further, in addition to requiring only a small working space, the space between adjacent cells can be made as small as possible to enable a precise layout of the cells, thereby making the entire cell module compact and effectively utilizing the space. Furthermore, the connection work is facilitated in that the polarity of the cell terminals is determined and the need to connect to the bus bar plate is relieved, and misassembly of the same poles and the resulting short circuit are prevented.

The cell module structure of the present invention includes a configuration in which the outer terminal provided on the cell is engaged with the holder by screwing, and the holder is provided with the torque holding portion for generating and holding the screwing torque. The torque holding portion provided in the holder prevents the holder from rotating together when the cell is screwed into the holder, and allows the outer bus bar to be screw-coupled without causing shear stress.

Next, the cell connecting member of the present invention is provided with a plurality of cylindrical cells, each of which has an outer terminal and an inner terminal having different polarities coaxially arranged at one end, arranged in parallel. A connecting member for connecting in series, the holder being engaged with the outer terminal of the cell to hold the cell, the inner bus bar corresponding to the inner terminal of the cell, and the outer terminal of the cell and being adjacent to each other. An outer bus bar connected to an inner bus bar of the cell, and as the outer terminal is engaged with the holder, the outer terminal comes into contact with the outer bus bar and the inner terminal comes into contact with the inner bus bar and is attached to one cell. ,
By connecting the outer bus bar and the inner bus bar of the connection member attached to the adjacent cells, the cells are connected in series.

This connecting member is preferably used as the connecting member of the cell module structure of the present invention. The outer terminal of the cell may be engaged with the holder in any form, but a screw connection may be used. In that case, the outer terminal of the cell is provided with a threaded portion, and the holder of the connecting member has a threaded portion with which the threaded portion is screwed. It is a preferable mode that the portion is provided in the holder. With this configuration, when the cell is screwed into the holder, co-rotation of the holder is prevented, and the outer bus bar can be screw-coupled without causing shear stress.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 in FIG. 1 indicates a cell, and 10 indicates a part of a connecting member on which the cell is mounted. Connection member 1
0 is attached to a resin plate P1 (shown in FIG. 3 and the like) on which a large number of cells 1 are collectively mounted. The cell 1 has a cylindrical casing 2 with an anode terminal (outer terminal) 3 at the upper end.
A and a positive electrode terminal (inner terminal) 3B are arranged coaxially with the casing 2. The negative electrode terminal 3A has a cylindrical shape having an outer diameter slightly smaller than that of the casing 2, and has a threaded portion 4 formed on the inner peripheral surface thereof. On the other hand, the positive electrode terminal 3B has a solid cylindrical shape and is arranged inside the negative electrode terminal 3A.
Its height is lower than that of the negative electrode terminal 3A, and it is buried in the negative electrode terminal 3A. An insulating ring 5 is interposed between the terminals 3A and 3B.

FIG. 2 (a) shows the connecting member 10 in an assembled state. As shown in FIG. 2 (b), the connecting member 10 has a nut 20, an insulating ring 30, a holder 40, in this order from the top. A negative electrode bus bar (outer bus bar) 50, an insulating cap 60, and a positive electrode bus bar (inner bus bar) 70 are provided.

The holder 40 has a circular collar portion 42 at the upper end of a cylindrical portion 41, and is made of an iron sintered material plated with zinc. A screw portion 43 to which the screw portion 4 of the negative electrode terminal 3A of the cell 1 is screwed is formed on the outer peripheral surface of the cylindrical portion 41. A partition 45 having a hexagonal hole 44 is formed inside the cylindrical portion 41.
5, above and below the recesses 46 and 47, respectively, as shown in FIG.
Are formed. At the periphery of the collar portion 42 of the holder 40,
A pair of tongue pieces 48 having the screw holes 48a are formed, and a pair of rectangular parallelepiped convex portions (torque holding portions) 49 protruding upward are formed. This convex portion 49
The peripheral edge of the collar portion 42 in the portion where is formed is linearly cut out, and the negative electrode bus bar 50 described later is engaged with this cutout portion 49a. The pair of protrusions 49 are formed at two locations on the circumference of the collar 42 that are equally divided (at a location 180 ° apart from each other). The relative location of the tongue piece 48 with respect to these protrusions 42 is the resin. It is appropriately determined according to the arrangement pattern of the connecting member 10 with respect to the plate P1.

The insulating ring 30 has a cylindrical portion 31 which is fitted in the upper recess 46 of the holder 40.
A hexagonal hole 32 that matches the hexagonal hole 44 of the holder 40 is formed at the bottom of the. At the upper end of the cylindrical portion 31, there is formed a collar portion 33 that is superposed on the upper surface of the collar portion 42 of the holder 40, and the periphery of the collar portion 33 corresponds to the pair of tongue pieces 48 of the holder 40. A notch 34 that is curved in a concave shape,
U-shaped notch 35 with which the convex portion 49 of the holder 40 fits
Are formed. Protrusions 34a and 35a are formed along the edges of the notches 34 and 35, respectively.

The negative electrode bus bar 50 has a collar portion 4 of the holder 40.
The ring portion 51, which is overlapped on the lower surface of 2, and the ring portion 5
1 and a bar-shaped terminal portion 53 that extends in the radial direction from the rising piece 52. The tip of the terminal portion 53 has a disk shape, and a through hole 53a into which the positive electrode bus bar 70 is inserted is formed in the center thereof. An engagement piece 54 is formed on the outer peripheral edge of the ring portion 51, which is separated from the rising piece 52 by 180 °, so as to face the rising piece 52. The rising piece 52 and the engaging piece 54 engage with the respective cutout portions 49 a of the holder 40, whereby the holder 40
The negative electrode bus bar 50 is positioned with respect to. The negative electrode bus bar 50 is made of aluminum.

The insulating cap 60 is attached to the upper end of the cylindrical portion 61 fitted in the recess 47 on the lower side of the holder 40.
The hexagonal cylindrical portion 62 that fits into the hexagonal hole 44 is formed in a convex shape in vertical cross section. Through this insulating cap 60,
The positive electrode bus bar 70 is inserted into the holder 40 from below.
The positive electrode bus bar 70 has a disk portion 71, a hexagonal nut portion 72 that fits into the hexagonal holes 44 and 32 of the holder 40 and the insulating ring 30, and a protruding terminal portion 73.
A screw portion 74 into which the nut 20 is screwed is formed on the outer peripheral surface of the terminal portion 73, and a screw hole 75 is formed at the center. The positive electrode bus bar 70 is made of aluminum similarly to the negative electrode bus bar 50.

The connection member 10 has been described above. The connection member 10 is fixed to the resin plate P1 while being fitted in the mounting hole formed in the resin plate P1, and the cell 1 is screwed to the holder 40.

As shown in FIG. 3, the connection member 10 is fixed by inserting the insert nut 80 into the resin plate P1 and inserting the ring portion 51 of the negative electrode bus bar 50 into the cylindrical portion 41 of the holder 40. The tongue piece 48 of the holder 40 is placed on the upper surface of P1, and the screw 81 passed through the screw passing hole 48a is screwed into the insert nut 80. Then, the insulating ring 30 and the insulating cap 60 are attached to the holder 40.
, The positive electrode bus bar 70 is inserted into the holder 40, and the screw portion 4 of the negative electrode terminal 3A of the cell 1 is inserted into the holder 40.
It is mounted by screwing it into the threaded portion 43 of. At that time, the holder 4
An appropriate torque receiving jig (not shown) is fitted to the convex portion 49 of No. 0, whereby the screwing torque is surely generated. Then, the end surface of the negative electrode terminal 3A of the cell 1 is changed to the negative electrode bus bar 50.
And the positive electrode terminal 3B of the cell 1 contacts the bottom surface of the positive electrode bus bar 70. The terminal portion 73 of the positive electrode bus bar 70 projects upward from the holder 40, and
3 is fitted with the through hole 53a of the terminal portion 53 of the negative electrode bus bar 50 in the connecting member 10 in which the adjacent cells 1 to be connected in series are mounted, and the nut 20 is screwed into the terminal portion 73 of the positive electrode bus bar 70 and fastened together.

By repeating the above operation in sequence, a cell module in which a large number of cells 1 are connected in series via the connecting member 10 is mounted on the resin plate P1. After mounting the cells 1 on the resin plate P1 in this manner, a control board (not shown) for detecting the voltage of each cell 1 is arranged above, and the screw 82 penetrating the control board is provided on the positive electrode bus bar 70. The control board may be fixed by screwing into the screw hole 75 of the terminal portion 73.

In the present embodiment, the negative electrode terminal 3A of the cell 1 is screwed to the holder 40 of the connecting member 10, so that the negative electrode bus bar 50 and the positive electrode bus bar 70 of the connecting member 10 are connected.
The negative electrode terminal 3A and the positive electrode terminal 3B of the cell 1 come into contact with each other, and the electric power is transferred to the adjacent cell 1 via the bus bars 50 and 70. Therefore, the contact surface pressure of each terminal 3A, 3B of the cell 1 with respect to each bus bar 50, 70 can be sufficiently secured, and the power transmission distance is also extremely short, so that the resistance can be significantly reduced. .

The negative electrode terminal 3A of the cell 1 is connected to the connecting member 1
Since the cell 1 can be attached to the connecting member 10 only by screwing it to the holder 40 of 0, a fastening member such as a bolt or a nut and a fastening tool are not required for the attachment. As a result, the connection work can be performed extremely easily. Further, in addition to requiring only a small working space, the space between the adjacent cells 1 can be made as small as possible to enable a precise layout of the cells 1, thus making the entire cell module compact and effectively utilizing the space. . Further, the connection work is facilitated in that the polarities of the terminals 3A and 3B of the cell 1 are determined and the necessity of connecting to the connection member 10 is released, and the wrong assembly of the same poles and the resulting short circuit are prevented.

Further, by screwing and coupling the cell 1 while holding the convex portion 49 of the holder 40 by an appropriate torque receiving jig, the screwing torque generated at that time can be sufficiently secured. Therefore, co-rotation of the holder 40 is prevented, and shear stress is not generated in the bent portions at both ends of the terminal portion 53 of the negative electrode bus bar 50 and the rising piece 52, and their deformation and breakage are prevented.

In this embodiment, the following operational effects are further exhibited. Since the negative electrode bus bar 50 and the positive electrode bus bar 70 are connected by fastening the nut 20 to the positive electrode bus bar 70, compared with the case where they are connected by a welding means such as YAG welding, the aluminum of each bus bar 50, 70 is made smaller. Any kind can be used. From this, it is possible to use a type of aluminum that is excellent in conductivity and has high strength, which is advantageous as a bus bar. Further, since all of them are screw-coupled, they can be disassembled even after assembling, which is extremely advantageous in terms of maintenance and the like as compared with the case of connecting by welding.

Since the holder 40 to which the cell 1 is screwed is made of an iron sintered material plated with zinc, problems such as galling are unlikely to occur when the cell 1 is screwed in, and the torque constant is converged. Contact axial force is stable. This is because, for example, in the case of an electric double layer capacitor, the cell and the bus bar are usually made of the same kind of aluminum, and if the two are directly screwed together, a problem such as galling is likely to occur, but this is prevented in the present embodiment. To be done.

Since the holder 40 has the function of holding the cell 1 and the negative electrode bus bar 50 which can be integrated with the holder 40 is separately provided as a function only for power transmission, these shapes are omitted. It can be as simple as possible. As a result, manufacturing becomes easier and the design of the production process for mass production becomes easier. For example, if the both have a complicated shape, it is necessary to employ a manufacturing method such as shaving aluminum, resulting in extremely poor manufacturing efficiency. In this respect, for example, the negative electrode bus bar 50 of the present embodiment can be manufactured by press molding of aluminum, which is advantageous in terms of availability of materials and manufacturability.

Since the cell 1 is screwed to the holder 40 which is fixed to the resin plate P1 by the screw 81, even when the cell 1 is mounted on a vehicle or the like where vibrations are constantly generated,
Vibration of the cell 1 is suppressed and does not adversely affect peripheral components.

In the above embodiment, the positive electrode terminal 3B
The positive electrode bus bar 70 is interposed between the negative electrode bus bar 50 connected to the positive electrode terminal 3B and the negative electrode bus bar 50. The positive electrode terminal 3B and the positive electrode terminal bus bar 70 are integrated into a positive electrode terminal.
The positive electrode terminal may be directly connected to the negative electrode bus bar 50.

Next, the holder 40 is attached to the resin plate P1.
Another form example of the structure fixed to is described with reference to FIGS. In the case of FIG. 4, instead of using the screw 81, a plurality of rubber bushes 90 are arranged on the insulating ring 30, and these rubber bushes 90 are pressed by the resin plate P2 which is fixed by being superposed on the resin plate P1. Sandwich it. The holder 40 is fixed by being pressed against the resin plate P2, and is damped by the elasticity of the rubber bush 90. Since the screw 81 is not used, the tongue piece portion 48 is not formed on the holder 40.

In the case of FIG. 5, the threaded hole 4 of the tongue piece 48 is shown.
The tapping screw 91 passed through 8a is directly screwed into the resin plate P1 to be fixed. In the case of FIG. 6, the rubber bush 92 and the nut 93 are attached to the resin plate P1.
, And the screw 94, which is inserted into the screw through hole 48a of the tongue piece 48, is inserted into the rubber bush 92 and screwed into the nut 93, and the holder 40 and the rubber bush 92 are fastened together.

The means shown in FIG. 4 and FIG. 5 have the advantages that the labor and time required for assembly can be saved and the weight can be reduced because the structure is simple. However, as to whether the fixed state is secured for a long period of time, FIG.
It is expected that it will be inferior to the above method. On the other hand, the means of FIG. 6 can secure the fixed state for a long period of time, but on the other hand, it cannot be denied that it is disadvantageous in terms of assembly time, cost of parts and weight saving. Therefore, in consideration of the balance of these characteristics, the fixing means shown in FIG. 3 is most preferable.

Next, another form of the holder 40 will be described. 7 (a) and 7 (b) show the holder 40A, which is made of resin, and like the holder 40, has a cylindrical portion 41 formed with a screw portion 43 and a collar portion 4.
2, and a pair of tongue pieces 48 having screw holes 48a and a pair of protrusions 49 are formed on the flange 42. Since it is made of resin, the insulating ring 30 and the insulating cap 60 of the above-described embodiment are unnecessary, and therefore the central hole 44A may have an inner diameter through which the positive electrode bus bar 70 penetrates. Since the holder itself is made of resin and the insulating ring 30 and the insulating cap 60 are not necessary, the number of parts of the connecting member can be reduced, the cost can be reduced, and the weight can be reduced. These effects are particularly remarkable when a large number of cells are connected.

FIG. 8 shows a connecting member 10 to the resin plate P1.
FIG. 3 shows an example of the arrangement of FIG. 1 and shows the surface on the side opposite to the cell 1 on the side where the connection member 10 is exposed. In this case, the connecting member 10 has three basic arrangements of the cells 1.
The pair of equilateral triangles are assembled in the resin plate P1 so as to be arranged in a staggered pattern as a whole. Most of the holders constituting the connecting member 10 are the above-mentioned holders 40. However, in order to arrange the connecting members 10 in an orderly manner with no gaps, the holders 40A shown in FIGS.
40B is used in part. 10A in the figure, 10
B is a connecting member in which the holders 40A and 40B are incorporated.

9 and 10 show the connecting member 1 respectively.
Another layout example of 0 is shown. In the case of FIG. 9, FIG.
Connection member 10 incorporating holder 40C shown in (c)
C is used in part. In the case of FIG. 10, FIG.
Holders 40D, 40E shown in (d), (e), (f),
Connection members 10D, 10E, 10F incorporating 40F
Is used in part.

In the above embodiment, the negative electrode terminal of the cell is screwed to the holder and engaged, but in the present invention, any form of engagement may be used. For example, it is possible to apply a structure in which the negative terminals of the cells are removably engaged with each other simply by linearly fitting them into the holder. In the above embodiment, the negative electrode is on the outside and the positive electrode is on the inside, but the polar arrangement may be reversed.

[0039]

As described above, according to the present invention,
An outer terminal and an inner terminal having different polarities are coaxially arranged at one end of the cell, and the outer terminal of the cell is engaged in series with a holder of a connecting member having a bus bar that transfers electric power between the cells. Due to the structure, the work of connecting the cells is extremely easy and the resistance is reduced, and the precise layout of the cells is possible to effectively utilize the space. Can be prevented.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a part of a cell module according to an embodiment of the present invention.

FIG. 2A is a perspective view of a connection member according to an embodiment of the present invention, and FIG. 2B is an exploded perspective view of the connection member.

FIG. 3 is a cross-sectional view showing a fixing structure of a holder to a resin plate according to an embodiment of the present invention.

FIG. 4A is a perspective view showing another form of a fixing structure of a holder to a resin plate, and FIG. 4B is a sectional view thereof.

5A is a perspective view showing another form of a fixing structure of a holder to a resin plate, and FIG. 5B is a sectional view thereof.

FIG. 6A is a perspective view showing another embodiment of a fixing structure of a holder to a resin plate, and FIG. 6B is a sectional view thereof.

FIG. 7A is a perspective view showing another form of the holder,
(B) is the sectional view.

FIG. 8 is a plan view showing an arrangement example of connection members on a resin plate.

FIG. 9 is a plan view showing another example of arrangement of connection members on a resin plate.

FIG. 10 is a plan view showing another example of arrangement of connection members on a resin plate.

11A to 11F are perspective views of the holder in which the formation position of the tongue piece portion is changed according to the arrangement of the connection member.

FIG. 12 is a perspective view showing an example of a conventional cell module structure.

[Explanation of symbols]

1 ... Cell, 3A ... Negative electrode terminal (outer terminal), 3B ... Positive electrode terminal (inner terminal), 10 ... Connection member, 40 ... Holder, 49
... convex portion (torque holding portion), 50 ... negative electrode bus bar (outer bus bar), 70 ... positive electrode bus bar (inner bus bar)

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yoshio Yamamoto Inventor Yoshio Yamamoto 1-4-1 Chuo, Wako-shi, Saitama, Ltd. Inside the Honda R & D Co., Ltd. (56) References JP 2002-8627 (JP, A) JP 2002- 33088 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01M 2/10 H01M 2/20 H01G 9/26

Claims (4)

(57) [Claims] 1. A cell module structure in which a plurality of cylindrical cells arranged in parallel are connected in series via a connecting member, wherein one end of the cell has an outer terminal and an inner terminal having mutually different polarities. The connecting member is disposed coaxially, and the connecting member corresponds to an outer terminal of the cell and a holder for holding the cell, an inner bus bar corresponding to the inner terminal of the cell, and an outer terminal of the cell. And an outer bus bar connected to the inner bus bar of the cell, and as the outer terminal is engaged with the holder of the connecting member, the outer terminal comes into contact with the outer bus bar and the inner terminal comes into contact with the inner bus bar. The connecting member is attached to the cell,
A cell module structure characterized in that the outer bus bar and the inner bus bar of a connecting member attached to each adjacent cell are connected to each other so that the cells are connected in series. 2. The engagement form of the outer terminal with the holder is a screw connection, and the holder is provided with a torque holding portion for generating and holding a screwing torque. The cell module structure described in. 3. A plurality of cylindrical cells having coaxially arranged outer terminals and inner terminals having different polarities at one end,
A connecting member for connecting in series in a state of being arranged in parallel, and a holder for holding the cell by engaging the outer terminals of the cell,
An inner bus bar corresponding to the inner terminal of the cell and an outer bus bar corresponding to the outer terminal of the cell and connected to the inner bus bar of the adjacent cell are provided, and as the outer terminal is engaged with the holder, the outer The terminals come into contact with the outer busbars and the inner terminals come into contact with the inner busbars to be attached to one cell, and the outer busbar and the inner busbar of the connection member attached to each adjacent cell are connected to each other, thereby A cell connecting member, wherein cells are connected in series. 4. The outer terminal is provided with a threaded portion as an engaging means for engaging with the holder, the threaded portion with which the threaded portion is screwed is formed in the holder, and the holder is provided with a screwing torque. 4. The cell connecting member according to claim 3, further comprising a torque holding portion for generating and holding the torque holding portion.