JP7288671B2 - secondary battery pack - Google Patents

Description

TECHNICAL FIELD The present invention relates to a secondary battery pack in which a plurality of cells are connected in parallel and in series, and more particularly to a secondary battery pack with good cell replacement work efficiency.

In recent years, rechargeable secondary batteries have come to be used not only in small mobile devices but also in medium and large devices such as automobiles. A medium- or large-sized battery pack connected to the Battery cells include prismatic cells and laminate cells. Laminate cells use an aluminum laminate sheet or the like as an exterior member, so they are light in weight, low in manufacturing cost, and easy to deform in shape. have the advantage of being

In Patent Document 1, an electrode terminal is exposed by penetrating upward through a slit-shaped through hole formed in the upper part of a case, and the electrode terminal protruding upward is bent at a right angle and attached to a plate-shaped main body of a bus bar. It is described that the electrode terminals and the busbars are electrically connected by laser welding. Further, in Patent Document 2, a tab support body having a bolt body projecting vertically is fitted into a fastening groove provided in a battery tab of a cell battery, and then the tab support body is provided in a battery tab of another cell battery. It describes connecting two cell batteries in parallel or in series by fitting a fastening groove into a bolt body, fitting the protruding bolt body into a through hole of a tab fixture, and fastening with a nut.

Patent No. 6014752 Patent No. 5491397

The tab connection method of Patent Document 1 has a problem that one of the two battery cells whose electrode terminals are laser-welded to the busbar cannot be removed, so that the battery cell cannot be replaced. On the other hand, in the tab connection method of Patent Document 2, the positions of the battery tabs of the two cell batteries are simultaneously aligned and tightened together with respect to the bolt body without fixing the two cell batteries to each other. There was a problem that the work efficiency of replacement was poor. Further, in the tab connection method of Patent Document 2, when the nut is slightly loosened, the tab supporting member and the tab fixing member cannot be removed from or attached to the cell battery. I had a bad problem. Furthermore, the tab connection methods of Patent Documents 1 and 2 have a common problem that no specific method for connecting a plurality of cells connected in parallel is further connected in series.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems in the conventional art. Another object of the present invention is to provide a secondary battery pack.
In addition to the above objects, another object of the present invention is to provide a secondary battery pack in which the quality can be checked more easily than in the conventional case, and the cell assembly efficiency and quality can be improved. That's what it is.

In order to achieve the above object, the present inventors have made intensive studies, and as a result, first fixed a cell with a tab bent at an acute angle and a cell with a tab bent at a right angle to each other, Multiple cells can be connected in parallel by passing through the notches of tabs of the same polarity and through-holes in the insulating plate and fixing them with nuts. It has been found that by fixing the cells to , a plurality of cells connected in parallel can be further connected in series, and the working efficiency of cell replacement can be improved.

In addition, the present inventor found that by providing a U-shaped notch in the tab in a direction parallel to the ridgeline of the bent portion that is bent at an acute angle or a right angle, the time required for disassembly is reduced compared to when a through hole is provided. Therefore, the inventors have found that the working efficiency of cell replacement can be further improved, and have arrived at the present invention.

That is, the present invention comprises a laminated type first cell and a second cell, each having two tabs of opposite polarities arranged on the same side and fixed to each other, and two stud bolts, respectively. It has a first bus bar, a second bus bar, and a first insulating plate and a second insulating plate each having two through holes, and one 1-1 tab of the first cell is a second bus bar bent at an acute angle. Equipped with a U-shaped 1-1 notch in the direction parallel to the ridgeline of the 1-1 bent portion and the 1-1 bent portion located on the tip side of the 1-1 bent portion and bent at an acute angle One 1-2 tab of the second cell has a flat 1-1 tip and is copolar with the 1-1 tab and has a 1-2 bend and a 1-2 bent at right angles. It has a flat 1-2 tip with a U-shaped 1-2 notch in a direction parallel to the ridgeline of the 1-2 bend which is located on the tip side of the bend and is bent at right angles. , the first bus bar includes a 1-1 stud bolt inserted into the 1-1 notch and the 1-2 notch, a 1-2 tab of a laminated type third cell adjacent to the second cell, and The first insulating plate has a U-shaped through groove into which the 1-2 stud bolt fixed to the third tab of the opposite polarity and the 1-1 bent portion and the 1-2 bent portion are inserted, Having a 1-1 through hole into which the 1-1 stud bolt is inserted and a 1-2 through hole into which the 1-2 stud bolt is inserted, the other 2-1 tab of the first cell is the 2-1 bend that is bent at an acute angle and the U-shaped second that is located on the tip side of the 2-1 bend and is parallel to the ridgeline of the 2-1 bend that is bent at an acute angle The other 2-2 tab of the second cell has a flat 2-1 tip with a -1 notch, and the other 2-2 tab of the second cell is the same polarity as the 2-1 tab and has a right angle bent 2-2 Flat second with a U-shaped 2-2 notch in the direction parallel to the ridgeline of the bent portion and the 2-2 bent portion located on the tip side of the 2-2 bent portion and bent at right angles The second bus bar has a 2-2 tip, a 2-1 stud bolt inserted into the 2-1 notch and the 2-2 notch, and a laminate-type fourth cell adjacent to the first cell. has a 2-2 stud bolt fixed to a 4 tab opposite in polarity to the 2-1 tab, and the second insulating plate has a 2-1 through hole into which the 2-1 stud bolt is inserted. , and a 2-2 through-hole into which a 2-2 stud bolt is inserted.

Here, in the above description, it is preferable that the first insulating plate has a rotation-preventing projection and restricting means for restricting relative positional and angular displacement with respect to the first bus bar.
Each of the first insulating plate and the second insulating plate preferably has a through hole for voltage measurement.

a first terminal plate disposed between the first bus bar and the first insulating plate; and a second terminal plate disposed between the second bus bar and the second insulating plate; It is preferable that the terminal plate and the second terminal plate each have a connection terminal to which a connection cable to a circuit for adjusting the voltage balance between the first cell and the second cell is connected.
The direction and angle of acute bending of the 1-1 bent portion of the 1-1 tab are the same as the direction and angle of acute bending of the 2-1 bent portion of the 2-1 tab. Preferably, the perpendicular bending direction and angle of the 1-2 bend of the 2 tab are the same as the perpendicular bending direction and angle of the 2-2 bend of the 2-2 tab.
Each of the first to fourth cells further has a flat side sheet in which the peripheral portion and the central portion are coplanar, and a raised side sheet in which the central portion is raised with respect to the peripheral portion; is arranged so that the raised side sheet of the second cell faces the flat side sheet of the adjacent first cell, and the third cell is arranged such that the flat side sheet of the third cell faces the flat side sheet of the adjacent second cell. Arranged to face the sheets, the fourth cells are preferably arranged such that the raised side sheet of the fourth cell faces the raised side sheet of the adjacent first cell.

According to the present invention, a plurality of cells connected in parallel can be further connected in series, and the working efficiency of cell replacement can be improved.
Moreover, according to the present invention, in addition to the above effects, the quality can be checked more easily than in the conventional art, and the cell assembly efficiency and quality can be improved.

1 is a front view showing a secondary battery pack of the present invention; FIG. FIG. 2 is a plan view showing a cross section AA of the secondary battery pack of FIG. 1; It is a partially enlarged plan view of the C0 part of Fig.2 (a). It is a partially enlarged cross-sectional view showing a cross section C1C1 of FIG. 2(b). It is a partially enlarged cross-sectional view showing a cross-section C2C2 of FIG. 2(b). It is a partial expansion side view which shows arrow C3 of FIG.2(b). FIG. 2 is a plan view showing a cross section BB of the secondary battery pack of FIG. 1; It is a partial enlarged plan view of the D0 section of Fig.3 (a). It is a partially enlarged cross-sectional view showing a cross-section D1D1 of FIG. 3(b). It is a partially enlarged cross-sectional view showing a cross-section D2D2 of FIG. 3(b). It is a partially enlarged side view showing an arrow D3 of FIG. 3(b).

A secondary battery pack of the present invention will be described in detail below based on preferred embodiments shown in the accompanying drawings. FIG. 1 is a front view showing a secondary battery pack of the invention.

The secondary battery pack 10 of the present invention has 28 laminate-type cells 20, and the 28 laminate-type cells 20 are laminated flat plates, and two adjacent laminate-type cells 20a and 20b are formed. including. Moreover, the secondary battery pack 10 of the present invention may further have 14 cooling plates 30 and a housing 40 . In that case, each cold plate 30 comprises a contact portion 32, which is located between two adjacent laminated cells 20a, 20b. The housing 40 has a fixing part (not shown) and a bottom wall 42, and the fixing part fixes the 28 laminated cells 20. As shown in FIG.

The number of parallel connections of two laminate type cells 20 is not particularly limited, and may be three or more. The number of 14 serially connected laminated cells 20 is not particularly limited, and may be 3 to 13 or 15 or more. The number of cooling plates 30 is not particularly limited, and may be 3 to 13 or 15 or more. The Y-axis in the figure is the stacking direction of the 28 laminate-type cells 20, and when the laminate-type cell 20 is a rectangular plate, the Y-axis is the thickness direction of the laminate-type cell 20, The X axis is the long side direction of the laminate type cell 20 and the Z axis is the short side direction of the laminate type cell 20 .

The laminate type cell 20 is not particularly limited as long as it is a cell of a secondary battery, but a cell of a lithium ion secondary battery is preferable. The material of the cooling plate 30 is not particularly limited as long as it has a high thermal conductivity, but copper, aluminum, etc. are preferable, and aluminum is more preferable. The material of the housing 40 is not particularly limited as long as it can support a laminated cell of about 8 kg, but iron, aluminum, etc. are preferable, and iron is more preferable.

Next, a tab connection method for the laminated cells constituting the secondary battery pack of the present invention will be described.
First, the method of connecting the upper tab of the two tabs will be described. FIG. 2(a) is a plan view showing a cross section AA of the secondary battery pack in FIG. 1, and FIG. FIG. 2(c) is a partially enlarged cross-sectional view showing the cross section C1C1 of FIG. 2(b), FIG. 2(d) is a partially enlarged cross-sectional view showing the cross section C2C2 of FIG. 2(b), and FIG. 2] is a partially enlarged side view showing an arrow C3 in FIG. 2(b). [FIG.

The secondary battery pack 10 of the present invention has a first cell 22 and a second cell 24, an upper bus bar 50 and a lower bus bar 60, an upper insulating plate 70 and a lower insulating plate 80, and a first cell 22 and second cell 24 each have two tabs and are secured together, upper busbar 50 and lower busbar 60 each have two stud bolts, upper insulating plate 70 and lower insulating plate 80 have two tabs. each with two through holes.

One upper first tab 22a of the first cell 22 has an upper first bent portion 22b bent at an acute angle and a flat upper first tip portion 22c. A U-shaped upper first notch 22d is provided on the tip side of the upper first notch 22d, and extends in a direction parallel to the ridge line of the upper first bent portion 22b bent at an acute angle. One upper second tab 24a of the second cell 24 has the same polarity as the upper first tab 22a, has a right-angled upper second bend 24b and a flat upper second tip 24c. The tip portion 24c is located on the tip side of the upper second bent portion 24b and has a U-shaped upper second cutout 24d, and the upper second cutout 24d is formed by the upper second bent portion 24b bent at right angles. extends in a direction parallel to the ridgeline of

The upper bus bar 50 has a first upper stud bolt 52a, a second upper stud bolt 52b, and a U-shaped through groove 54. The first upper stud bolt 52a has a first upper notch 22d and a second upper notch. 24d, the upper second stud bolt 52b is fixed to the third tab 26a of the third cell 26 adjacent to the second cell 24, the third tab 26a being of opposite polarity to the upper second tab 24a, The upper first bent portion 22 b and the upper second bent portion 24 b are inserted into the through groove 54 . The upper insulating plate 70 has an upper first through-hole 72a and an upper second through-hole 72b. The upper first stud bolt 52a is inserted into the upper first through-hole 72a, and the upper second through-hole 72b is provided with an upper first stud bolt 52a. , the upper second stud bolt 52b is inserted.

Here, the two laminate type cells 20 a and 20 b that constitute the secondary battery pack 10 of the present invention correspond to the first cell 22 and the second cell 24 . The upper first tab 22a, the upper first bent portion 22b, the upper first tip portion 22c, and the upper first notch 22d are the 1-1 tab, the 1-1 bent portion, and the 1-1 The upper second tab 24a, the upper second bent portion 24b, the upper second tip 24c, and the upper second notch 24d correspond respectively to the tip portion and the 1-1 notch, and the 1-2 tab of the present invention. , the 1-2 bent portion, the 1-2 tip portion, and the 1-2 notch, respectively, and the upper bus bar 50, the upper first stud bolt 52a, and the upper second stud bolt 52b correspond to the first The lower busbar 60 corresponds to the second busbar of the present invention, the upper insulating plate 70, the upper first through hole 72a, the upper second The through-hole 72b corresponds to the first insulating plate, the 1-1 through-hole, and the 1-2 through-hole of the present invention, and the lower insulating plate 80 corresponds to the second insulating plate of the present invention. However, the U-shaped notch at the tip of each tab is not particularly limited as long as it has a shape that allows the stud bolt to be inserted. A U-shaped notch is preferable in terms of efficiency. Also, the U-shaped notch and the circular or oval through hole are collectively referred to as the stud bolt insertion portion.

Next, a method of connecting the lower tab of the two tabs will be described. FIG. 3(a) is a plan view showing a cross section BB of the secondary battery pack in FIG. 3(c) is a partially enlarged sectional view showing the section D1D1 of FIG. 3(b), FIG. 3(d) is a partially enlarged sectional view showing the section D2D2 of FIG. 3(b), and FIG. 3(e). 3] is a partially enlarged side view showing an arrow D3 in FIG. 3(b). [FIG.

The other lower first tab 22e of the first cell 22 has a sharply bent lower first bend 22f and a flat lower first tip 22g, the lower first tip 22g A U-shaped lower first notch 22h is provided on the tip side of the first bent portion 22f, and the lower first notch 22h is located on the ridgeline of the lower first bent portion 22f bent at an acute angle. stretch in parallel directions. The other lower second tab 24e of the second cell 24 is of the same polarity as the lower first tab 22e and has a right-angled lower second bend 24f and a flat lower second tip 24g. , The lower second tip portion 24g is located on the tip side of the lower second bent portion 24f and has a U-shaped lower second notch 24h. It extends in a direction parallel to the ridgeline of the bent lower second bent portion 24f.

The lower bus bar 60 has a lower first stud bolt 62a and a lower second stud bolt 62b. The lower second stud bolt 62b is inserted and fixed to the fourth tab 28a of the fourth cell 28 adjacent to the first cell 22, the fourth tab 28a being of opposite polarity to the lower first tab 22e. The lower insulating plate 80 has a lower first through hole 82a and a lower second through hole 82b. A lower first stud bolt 62a is inserted into the lower first through hole 82a. A lower second stud bolt 62b is inserted into the second through hole 82b.

Here, the lower first tab 22e, the lower first bent portion 22f, the lower first tip portion 22g, and the lower first notch 22h are the 2-1 tab and the 2-1 bent portion of the present invention. , 2-1 tip portion, and 2-1 notch, respectively, the lower second tab 24e, the lower second bent portion 24f, the lower second tip portion 24g, and the lower second notch 24h are , corresponding to the 2-2 tab, 2-2 bent portion, 2-2 tip portion, and 2-2 notch of the present invention, respectively, the lower bus bar 60, the lower first stud bolt 62a, the lower The second stud bolt 62b corresponds to the second bus bar, the 2-1st stud bolt, and the 2-2nd stud bolt of the present invention, and includes the lower insulating plate 80, the lower first through hole 82a, the lower second through hole 82a, and the second stud bolt 62b. The hole 82b corresponds to the second insulating plate, the 2-1 through hole, and the 2-2 through hole of the present invention. However, the U-shaped notch at the tip of each tab is not particularly limited as long as it has a shape that allows the stud bolt to be inserted. A U-shaped notch is preferable in terms of efficiency. Also, the U-shaped notch and the circular or oval through hole are collectively referred to as the stud bolt insertion portion.

That is, when connecting a plurality of cells in parallel and in series, the tabs of the same polarity of the first cell 22 and the second cell 24 that are connected in parallel are overlapped, and one of the double tabs is passed through the through groove 54 . is fixed between the upper busbar 50 and the upper insulating plate 70 with the upper first stud bolt 52a, and the other double tab is fixed between the lower busbar 60 and the lower insulating plate 80 with the lower first stud bolt 62a. One of the double tabs fixed between the upper bus bar 50 and the upper insulating plate 70 and the third tab 26a of the third cell 26 of opposite polarity are attached to the upper bus bar 50 with upper second stud bolts 52b. and the upper insulating plate 70, and the fourth tab 28a of the fourth cell 28 having a different polarity from the other double tab fixed between the lower bus bar 60 and the lower insulating plate 80 is attached to the lower It is fixed between the lower bus bar 60 and the lower insulating plate 80 with the side second stud bolts 62b.

A tab having a polarity different from that of the lower second tab 24e, which is adjacent to the lower second tab 24e of the second cell 24, is shown in FIG. 3A as being in contact with the lower second tab 24e. However, it is necessary to attach an insulating tape or the like to the contact surface of at least one of the tabs of the opposite polarity and the lower second tab 24e to electrically insulate them from each other. The material of the upper bus bar 50 and the lower bus bar 60 is not particularly limited as long as it is a highly conductive material, but copper, aluminum, etc. are preferable, and aluminum is more preferable. The material of the upper insulating plate 70 and the lower insulating plate 80 is not particularly limited as long as it is a material with low conductivity. preferable. In addition, when the upper insulating plate 70 and the lower insulating plate 80 are elastically or plastically deformed and the nuts of the stud bolts are loosened, the upper first stud bolts 52a and the upper first through holes of the upper insulating plate 70 72a, between the upper second stud bolt 52b and the upper second through hole 72b of the upper insulating plate 70, and between the lower first stud bolt 62a and the lower first through hole 82a of the lower insulating plate 80. A cylindrical metal collar may be inserted between the lower second stud bolt 62b and the lower second through hole 82b of the lower insulating plate 80, respectively.

With such a configuration, the first cell and the second cell are fixed to each other, and the positions of the tabs can be aligned in advance. Not only efficiency but also cell assembly efficiency and quality can be improved. Further, by slightly loosening the nuts of the stud bolts, the bus bar and the insulating plate can be removed from or attached to the tab, so that the secondary battery pack of the present invention can improve the working efficiency of cell replacement. can.

In the above description, the two tabs of the first cell 22, the two tabs of the second cell 24, the two busbars, and the two insulating plates are specified by using the expressions upper side and lower side. The secondary battery pack is not limited to the upper and lower sides, and may be arranged, for example, on the left and right sides on a horizontal plane. may be physically arranged on the lower side, and the lower first tab 22e may be arranged physically on the upper side. Furthermore, in the secondary battery pack of the present invention, the 1-1 tab and the 1-2 tab are not limited to corresponding to the upper tab, that is, the upper first tab 22a and the upper second tab 24a, respectively. , the lower tabs, namely the lower first tab 22e and the lower second tab 24e, respectively. That is, they are not limited to corresponding to the lower first tab 22e and the lower second tab 24e, respectively, and may correspond to the upper tab, that is, the upper first tab 22a and the upper second tab 24a, respectively.

The upper insulating plate 70 constituting the secondary battery pack 10 of the present invention may have a detent projection 74 and restricting means (not shown), in which case the restricting means is the upper bus bar. Limits relative position and angular deviations with 50 . The limiting means is, for example, a pin fixed to the upper bus bar 50 and a hole in the upper insulating plate 70 that fits into the pin. It is a projection and is a cut surface of upper bus bar 50 and a side wall extending from upper insulating plate 70 so as to cover the cut surface.

That is, unless the nut of the upper first stud bolt 52a is tightened while pressing the protrusion 74 as a detent, the through groove 54 of the upper bus bar 50 may tear off the upper first tab 22a and the upper second tab 24a.

With such a configuration, the rotation of the first bus bar can be stopped when the nuts of the stud bolts are tightened. and quality can be improved.

The upper insulating plate 70 constituting the secondary battery pack 10 of the present invention may have a through hole 76 for voltage measurement, and the lower insulating plate 80 may have a through hole 84 for voltage measurement. good.

That is, in order to measure the voltages of the upper first tab 22a, the lower first tab 22e, etc., it is not necessary to bring the measuring device probe into contact with the upper first stud bolt 52a, the lower first stud bolt 62a, and the like. Become.

With such a configuration, the contact state of the measuring device probe is stabilized, so that the quality of the secondary battery pack of the present invention can be easily confirmed.

The secondary battery pack 10 of the present invention may further include an upper terminal plate 90 and a lower terminal plate 100. In that case, the upper terminal plate 90 includes the upper bus bar 50 and the upper insulating plate 70. , and the lower terminal plate 100 is arranged between the lower bus bar 60 and the lower insulating plate 80 . The upper terminal plate 90 and the lower terminal plate 100 are individually provided with connection terminals (not shown), and the connection terminals include a connection cable to a circuit for adjusting the voltage balance between the first cell 22 and the second cell 24. is connected.

Here, the upper terminal board 90 corresponds to the first terminal board of the present invention, and the lower terminal board 100 corresponds to the second terminal board of the present invention.

That is, it is not necessary to directly connect the connection cables to the upper first tab 22a, the lower first tab 22e, the upper bus bar 50, the lower bus bar 60, and the like. The material of the upper terminal plate 90 and the lower terminal plate 100 is not particularly limited as long as it is a highly conductive material, but copper, aluminum, etc. are preferable, and aluminum is more preferable.

With such a configuration, the connection cable can be pre-soldered in a separate process before assembly, so that the secondary battery pack of the present invention can improve cell assembly efficiency and quality.

Regarding the first cell 22 and the second cell 24 constituting the secondary battery pack 10 of the present invention, the acute bending direction and angle of the upper first bent portion 22b of the upper first tab 22a are the same as those of the lower first tab 22e. may be the same as the direction and angle of acute bending of the lower first bent portion 22f, and the direction and angle of right angle bending of the upper second bent portion 24b of the upper second tab 24a may be the same as the lower second It may be the same as the perpendicularly bent direction and angle of the lower second bent portion 24f of the tab 24e.

That is, when bending two tabs each of the first cell 22 and the second cell 24, although the bending angles are different between the first cell 22 and the second cell 24, the upper first tab 22a and the lower first tab 22e are bent. It is sufficient to bend in the same direction and angle, and bend the upper second tab 24a and the lower second tab 24e in the same direction and angle.

Such a configuration simplifies the shapes of the assembly jig and the transportation tray, so that the secondary battery pack of the present invention can improve cell assembly efficiency and quality.

Each of the first cell 22, the second cell 24, the third cell 26, and the fourth cell 28 constituting the secondary battery pack 10 of the present invention further has a flat side sheet 20f and a raised side sheet 20p. Alternatively, the flat side sheet 20f is coplanar at the periphery and the center, and the raised side sheet 20p is raised at the center relative to the periphery. The second cells 24 are arranged such that the raised side sheet 20p of the second cell 24 faces the flat side sheet 20f of the adjacent first cell 22, and the third cell 26 is arranged such that the flat side sheet 20f of the adjacent first cell 22 20f is arranged to face the flat side sheet 20f of the adjacent second cell 24, and the fourth cell 28 is arranged such that the raised side sheet 20p of the fourth cell 28 faces the raised side sheet 20p of the adjacent first cell 22. are arranged to face the

That is, when configuring a circuit in which the first cell 22 and the second cell 24, which are connected in parallel, are connected in series between the third cell 26 and the fourth cell 28, which are connected in series, first, the tabs A second cell 24 having the same positive and negative electrode arrangement and tab notch direction as the first cell 22 is manufactured as the second cell 24, and the tab notch direction is the same as that of the first cell 22 and the tab notch direction is the same as that of the first cell 22. A third cell 26 and a fourth cell 28 are produced in the opposite direction to the first cell 22, and then the flat side sheet 20f and the raised side sheet 20p are laminated in the same arrangement to form the third cell 26 and the fourth cell. 4 cells 28, the flat side sheet 20f and the raised side sheet 20p are arranged in the same arrangement, and the first cell 22 and the second cell 24 are laminated, and the flat side sheet 20f and the raised side sheet 20p are arranged in an opposite arrangement. It will be better if the layer is laminated with

With such a configuration, it is sufficient to manufacture two types of cells that differ only in the direction of the notch of the tab. The battery pack can improve cell assembly efficiency and quality.
The secondary battery pack of the present invention is basically configured as described above.

Although the secondary battery pack of the present invention has been described in detail above, the present invention is not limited to the above description, and it goes without saying that various improvements and modifications may be made without departing from the gist of the present invention. be.

ADVANTAGE OF THE INVENTION The secondary battery pack of the present invention can further connect a plurality of cells connected in parallel in series, and in addition to the effect that the work efficiency of cell replacement can be improved, the quality can be easily improved to the same level or higher than the conventional one. This is industrially useful because it can be confirmed and the cell assembly efficiency and quality can be improved.

10 secondary battery pack 20, 20a, 20b laminate type cell 20f flat side sheet 20p raised side sheet 22 first cell 22a upper first tab (1-1 tab)
22b Upper first bend (1-1 bend)
22c Upper first tip (1-1 tip)
22d Upper first notch (1-1 notch)
22e Lower first tab (2-1 tab)
22f Lower first bend (2-1 bend)
22g Lower first tip (2-1 tip)
22h Lower first notch (2nd-1 notch)
24 second cell 24a upper second tab (1-2 tab)
24b Upper second bending portion (1-2 bending portion)
24c Upper second tip (1-2 tip)
24d Upper second notch (1-2 notch)
24e lower second tab (2-2 tab)
24f Lower second bend (2-2 bend)
24g lower second tip (2-2 tip)
24h Lower second notch (2nd-2nd notch)
26 third cell 26a third tab 28 fourth cell 28a fourth tab 30 cooling plate 32 contact portion 40 housing 42 bottom wall 50 upper bus bar (first bus bar)
52a Upper first stud bolt (1-1 stud bolt)
52b Upper second stud bolt (1st-2nd stud bolt)
54 through groove 60 lower busbar (second busbar)
62a Lower 1st stud bolt (2nd-1st stud bolt)
62b Lower second stud bolt (2-2 stud bolt)
70 upper insulating plate (first insulating plate)
72a Upper first through hole (1-1 through hole)
72b Upper second through hole (1-2 through hole)
74 protrusions 76, 84 through holes 80 lower insulating plate (second insulating plate)
82a Lower first through hole (2-1 through hole)
82b Lower second through hole (2-2 through hole)
90 upper terminal board (first terminal board)
100 lower terminal board (second terminal board)

Claims (6)

Laminate-type first and second cells each provided with two tabs of opposite polarities arranged on the same side and fixed to each other, and first and second bus bars each provided with two stud bolts. a busbar, and a first insulating plate and a second insulating plate each having two through holes,
One 1-1 tab of the first cell includes a 1-1 bent portion bent at an acute angle and the 1-1 bent portion located on the distal side of the 1-1 bent portion and bent at an acute angle having a flat 1-1 tip with a U-shaped 1-1 notch in the direction parallel to the ridgeline of the part,
One 1-2 tab of the second cell has the same polarity as the 1-1 tab, is bent at right angles to the 1-2 bent portion, and is located on the tip side of the 1-2 bent portion. And having a flat 1-2 tip portion with a U-shaped 1-2 notch in a direction parallel to the ridgeline of the 1-2 bent portion bent at right angles,
The first bus bar includes a 1-1 stud bolt inserted into the 1-1 notch and the 1-2 notch, and a laminate-type third cell adjacent to the second cell. having a 1-2 stud bolt fixed to a third tab having a different polarity from the -2 tab, and a U-shaped through groove into which the 1-1 bent portion and the 1-2 bent portion are inserted;
The first insulating plate has a 1-1 through hole into which the 1-1 stud bolt is inserted and a 1-2 through hole into which the 1-2 stud bolt is inserted,
The other 2-1 tab of the first cell has a 2-1 bent portion bent at an acute angle and the 2-1 bent portion located on the tip side of the 2-1 bent portion and bent at an acute angle having a flat 2-1 tip with a U-shaped 2-1 notch in the direction parallel to the ridgeline of the part,
The other 2-2 tab of the second cell has the same polarity as the 2-1 tab, is bent at right angles to the 2-2 bent portion, and is located on the tip side of the 2-2 bent portion. and having a flat 2-2 tip portion with a U-shaped 2-2 notch in a direction parallel to the ridgeline of the 2-2 bent portion bent at right angles,
The second bus bar includes a 2-1 stud bolt inserted into the 2-1 notch and the 2-2 notch, and a laminate-type fourth cell adjacent to the first cell. Having a 2-2 stud bolt fixed to a 2-1 tab and a 4th tab of opposite polarity,
The second insulating plate has a 2-1 through-hole into which the 2-1 stud bolt is inserted, and a 2-2 through-hole into which the 2-2 stud bolt is inserted. pack. 2 . The secondary battery pack according to claim 1 , wherein the first insulating plate has a rotation-preventing protrusion and a restricting means for restricting relative positional and angular displacement with respect to the first bus bar. 3. The secondary battery pack according to claim 1, wherein each of said first insulating plate and said second insulating plate has a through hole for voltage measurement. Further, a first terminal plate arranged between the first bus bar and the first insulating plate and a second terminal plate arranged between the second bus bar and the second insulating plate are provided. death,
4. The method according to claim 1, wherein the first terminal plate and the second terminal plate are individually provided with connection terminals to which a connection cable to a circuit for adjusting the voltage balance between the first cell and the second cell is connected. The secondary battery pack according to any one of items 1 and 2. The direction and angle of acute bending of the 1-1 bent portion of the 1-1 tab are the same as the direction and angle of acute bending of the 2-1 bent portion of the 2-1 tab. , the perpendicular bending direction and angle of the 1-2 bent portion of the 1-2 tab are the same as the perpendicular bending direction and angle of the 2-2 bent portion of the 2-2 tab. A secondary battery pack according to any one of claims 1 to 4. Each of the first to fourth cells further has a flat side sheet in which the peripheral portion and the central portion are on the same plane, and a raised side sheet in which the central portion is raised with respect to the peripheral portion,
The second cells are arranged such that the raised side sheet of the second cell faces the flat side sheet of the adjacent first cell, and the third cell is arranged such that the flat side sheet of the third cell faces the flat side sheet of the adjacent first cell. A sheet is arranged to face the flat side sheet of the adjacent second cell, and the raised side sheet of the fourth cell is aligned with the raised side sheet of the adjacent first cell. The secondary battery pack according to any one of claims 1 to 5, arranged to face the secondary battery pack.

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