JP2021111510A - Secondary battery pack - Google Patents

Abstract

To provide a secondary battery pack that reduces the number of parts and simplifies the cooling structure of a cell.SOLUTION: A secondary battery pack 10 includes 28 flat laminated cells 20, 14 cooling plates 30, and a housing 40. Each of the cooling plates 30 includes a contact portion 32 and a protrusion 34, and the contact portion 32 is arranged between two adjacent laminated cells 20a and 20b from among the 28 laminated cells 20, and the protrusion 34 extends from the contact portion 32. The housing 40 includes a bottom wall 42 and a protective wall 44, the bottom wall 42 has 14 through holes 42a, and a part of the protrusions 34 of each of the cooling plates 30 penetrates each through hole 42a. The protrusion 34 of each of the cooling plates 30 includes a protrusion 34a, which protrudes from each through hole 42a of the bottom wall 42. The protective wall 44 protects the protrusion 34a of each cooling plate 30 to form an air flow path 44a, and the air flowing through the air flow path 44a cools the protrusion 34a.SELECTED DRAWING: Figure 1

Description

The present invention relates to a secondary battery pack in which a plurality of cells are connected in parallel and in series, and particularly relates to a secondary battery pack having a high cooling capacity.

In recent years, rechargeable and dischargeable secondary batteries have come to be used not only in small mobile devices but also in medium and large devices such as automobiles, in which case a large number of battery cells are generally electrically used. A medium and large battery pack connected to is used. In addition, there are square cells, laminated cells, etc. as battery cells, but since the laminated cell uses an aluminum laminated sheet or the like as an exterior member, the weight is small, the manufacturing cost is low, and the shape is easily deformed. Has the advantage of being.

Patent Document 1 describes a cooling member having a structure including a plate-shaped heat radiating portion interposed between battery cells and a refrigerant flowing portion formed along the outer edge of the heat radiating portion. ing. Further, in Patent Document 2, a heat conductive plate provided between battery cells absorbs heat from two adjacent battery cells and dissipates the heat to cooling fins provided in a case of an assembled battery. , Cooling the two battery cells is described.

Patent No. 6506309 Patent No. 6363529

The cell cooling method of Patent Document 1 has a problem that the number of parts increases and the structure becomes complicated because a mechanism for circulating the refrigerant is required. Further, the cell cooling method of Patent Document 2 has a problem that the number of parts increases and the structure becomes complicated because the heat conductive plate and the cooling fin are separate parts.

The present invention has been made in view of such problems in the past, and an object of the present invention is to provide a secondary battery pack in which the number of parts is reduced and the cooling structure of a cell is simplified.
In addition to the above objectives, another object of the present invention is to have a cooling capacity equal to or higher than the conventional one, to be used in a high temperature environment, to have good cell replacement work efficiency, and to improve cell assembly efficiency and quality. The purpose is to provide a rechargeable battery pack that is good and whose quality can be easily confirmed.

As a result of intensive research to achieve the above object, the present inventor first arranges a plurality of cooling plates individually between two adjacent laminated cells among the plurality of laminated cells. A plurality of through holes are provided in the bottom wall of the housing through which a part of the protrusions provided on each cooling plate individually penetrates, and the protrusions of each cooling plate are provided with protrusions protruding from the through holes in the bottom wall. It was found that the number of parts can be reduced and the cooling structure of the cell can be simplified.

Further, the present inventor has a cooling capacity equal to or higher than the conventional one by forming an air flow path in which the protective wall provided in the housing protects the protruding portion of each cooling plate and cools the protruding portion. The present invention was made by finding that it can be used even in a high temperature environment.

That is, the present invention is a plurality of contact portions and contact portions individually arranged between a plurality of laminated flat laminated cells and two adjacent laminated cells among the plurality of laminated cells. A plurality of cooling plates individually provided with protrusions extending in a direction perpendicular to the stacking direction of the laminated cells, a fixing portion for fixing the plurality of laminated cells, and a part of the protrusions of each cooling plate penetrate individually. It has a bottom wall having a plurality of through holes and a housing provided with a protective wall, and the protrusion of each cooling plate is provided with a protrusion protruding from each through hole of the bottom wall, and the protective wall is Provided is a secondary battery pack that protects the protruding portion of each cooling plate and forms an air flow path for cooling the protruding portion.

Here, in the above, it is preferable that each cooling plate has two heat radiating sheets, and the two heat radiating sheets are individually attached to the surfaces on both sides.
Each cooling plate preferably has a plurality of protrusions.

The two laminated cells are the first cell and the second cell which have two tabs and are fixed to each other, and the secondary battery pack further has a first bus bar and a second cell which have two stud bolts, respectively. It has a bus bar and a first insulating plate and a second insulating plate having two through holes, respectively, and one 1-1 tab of the first cell has a sharply bent 1-1 bending portion and a second insulating plate. It has a flat 1-1 tip with a 1-1 stud bolt insertion part located on the tip side of the 1-1 bend, and one of the 1-2 tabs of the second cell is the first. -Flat 1-2 with the same pole as the tab and with the 1-2 bent part bent at a right angle and the 1-2 stud bolt insertion part located on the tip side of the 1-2 bent part. The first bus bar has a tip portion, and the first bus bar is the first of the first stud bolt inserted into the 1-1 stud rod insertion part and the 1-2 stud bolt insertion part, and the third cell adjacent to the second cell. It has a 1-2 stud bolt fixed to a 1-2 tab and a 3rd tab of a different pole, and a U-shaped through groove into which a 1-1 bent portion and a 1-2 bent portion are inserted. The 1 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, and is the other of the first cell. The 2-1 tab is a flat 2-1 tip portion having a 2-1 bent portion bent at a sharp angle and a 2-1 stud bolt insertion portion located on the tip side of the 2-1 bent portion. The other 2-2 tab of the 2nd cell is the same pole as the 2-1 tab and is located on the tip side of the 2-2 bent part and the 2-2 bent part bent at a right angle. It has a flat 2-2 tip with a 2-2 stud rod insertion part, and the 2nd bus bar is inserted into the 2-1 stud bolt insertion part and the 2-2 stud bolt insertion part. It has 2-1 stud rods and 2-2 stud bolts fixed to the 2-1 tab and the 4th tab of the different pole of the 4th cell adjacent to the 1st cell, and the 2nd insulating plate is the 1st. It is preferable to have 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.
The first insulating plate preferably has a detent protrusion and a limiting means for limiting the deviation of the relative position and angle 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.

According to the present invention, the number of parts can be reduced and the cooling structure of the cell can be simplified.
Further, according to the present invention, in addition to the above effects, it has a cooling capacity equal to or higher than that of the conventional one, can be used in a high temperature environment, can improve the work efficiency of cell replacement, and can assemble the cell. And the quality can be improved, and the quality can be easily confirmed.

It is a front view which shows the secondary battery pack of this invention. It is a top view which shows the cross section AA of the secondary battery pack of FIG. It is a partially enlarged plan view of the C0 part of FIG. 2A. 2 is a partially enlarged cross-sectional view showing a cross section C1C1 of FIG. 2B. FIG. 2 is a partially enlarged cross-sectional view showing a cross section C2C2 of FIG. 2 (b). It is a partially enlarged side view which shows the arrow C3 of FIG. 2 (b). It is a top view which shows the cross section BB of the secondary battery pack of FIG. It is a partially enlarged plan view of the D0 part of FIG. 3A. It is a partially enlarged sectional view which shows the sectional D1D1 of FIG. 3 (b). It is a partially enlarged sectional view which shows the sectional D2D2 of FIG. 3 (b). It is a partially enlarged side view which shows the arrow view D3 of FIG. 3 (b).

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

The secondary battery pack 10 of the present invention has 28 laminated cells 20, 14 cooling plates 30, and a housing 40. The 28 laminated cells 20 are laminated flat plates. Each cooling plate 30 includes a contact portion 32 and a protrusion 34, and the contact portion 32 is arranged between two adjacent laminated cells 20a and 20b among the 28 laminated cells 20 and has a protrusion. 34 extends from the contact portion 32 in a direction perpendicular to the stacking direction (Y direction) of the 28 laminated cells 20. The housing 40 includes a fixing portion (not shown), a bottom wall 42, and a protective wall 44. The fixing portion fixes 28 laminated cells 20, and the bottom wall 42 has 14 through holes 42a. A part of the protrusion 34 of each cooling plate 30 penetrates each through hole 42a. The protrusion 34 of each cooling plate 30 includes a protrusion 34a, and the protrusion 34a protrudes from each through hole 42a of the bottom wall 42. The protective wall 44 protects the protruding portion 34a of each cooling plate 30, forms an air flow path 44a, and the air flowing through the air flow path 44a cools the protruding portion 34a.

That is, the heat of the two adjacent laminated cells 20a and 20b is transferred from the contact portion 32 of the cooling plate 30 arranged between them to the protruding portion 34a, and the protruding portion 34a is generated by the air flowing through the air flow path 44a. Be cooled. The number of two parallel connections of the laminated cell 20 is not particularly limited, and may be three or more. The number of 14 serial connections of the laminated cell 20 is not particularly limited, and may be 3 to 13 or 15 or more. The number of the 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 28 laminated cells 20, and when the laminated cells 20 are rectangular flat plates, the Y-axis is the thickness direction of the laminated cells 20. The X-axis is the long side direction of the laminated cell 20, and the Z-axis is the short side direction of the laminated cell 20.

The laminated 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 is a material having high thermal conductivity, but copper, aluminum and the like 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 and the like are preferable, and iron is more preferable.

With such a configuration, the only component arranged between the surface of the laminated cell 20 to be cooled and the air flow path 44a which is the cooling means is the cooling plate 30 instead of a plurality of components. Moreover, since the contact portion 32 and the protrusion 34 have the same thickness and can be manufactured by cutting from one plate, the secondary battery pack of the present invention reduces the number of parts and simplifies the cell cooling structure. Can be transformed into. Further, since the air flow path 44a has no bent portion and is straight, has a rectangular cross-sectional shape from the inlet to the outlet, and has no obstacles other than the protrusion 34a, the cooling capacity of the protrusion 34a is high. Further, since the air flow path 44a faces the bottom wall 42 and the protective wall 44, the housing 40 can be cooled at the same time.

Each cooling plate 30 constituting the secondary battery pack 10 of the present invention may have two heat radiating sheets (not shown), in which case each heat radiating sheet is attached to each surface on both sides. Be done. That is, a heat radiating sheet is inserted between the laminated cell 20a and the cooling plate 30, and another heat radiating sheet is inserted between the laminated cell 20b and the cooling plate 30. The material of the heat radiating sheet is not particularly limited as long as it is a material having high thermal conductivity, but graphite, non-silicone acrylic material and the like are preferable, and non-silicone acrylic material is more preferable.

With such a configuration, the secondary battery pack of the present invention has a high cooling capacity and can be used even in a high temperature environment.

Each cooling plate 30 constituting the secondary battery pack 10 of the present invention may have three protrusions 34a. That is, when the number of protruding portions 34a is large to some extent, the flow of air flowing through the air flow path 44a is likely to be disturbed, and the cooling effect can be further enhanced. The number of the protruding portions 34a is not particularly limited and may be four or more, but there is a trade-off with this because the cooling effect decreases as the surface area of the protruding portions 34a becomes smaller. Further, it is preferable that the number of through holes 42a is also an integral multiple of 14 corresponding to the number of protrusions 34a.

With such a configuration, the secondary battery pack of the present invention has a high cooling capacity and can be used even in a high temperature environment.

Next, a tab connection method for laminated cells constituting the secondary battery pack of the present invention will be described.
First, the tab connection method on the upper side of the two tabs will be described. 2 (a) is a plan view showing a cross section AA of the secondary battery pack of FIG. 1, and FIG. 2 (b) is a partially enlarged plan view of the C0 portion of FIG. 2 (a). c) is a partially enlarged cross-sectional view showing the cross section C1C1 of FIG. 2 (b), and FIG. 2 (d) is a partially enlarged cross-sectional view showing the cross section C2C2 of FIG. 2 (b). Is a partially enlarged side view showing the arrow C3 of FIG. 2 (b).

The two laminated cells 20a and 20b constituting the secondary battery pack 10 of the present invention may be the first cell 22 and the second cell 24, in which case the first cell 22 and the second cell 24 Each has two tabs and is fixed to each other. Further, the secondary battery pack 10 of the present invention may further include an upper bus bar 50 and a lower bus bar 60, and an upper insulating plate 70 and a lower insulating plate 80, in which case the upper bus bar The 50 and the lower bus bar 60 each include two stud bolts, and the upper insulating plate 70 and the lower insulating plate 80 each include 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, and the upper first tip portion 22c has an upper first bent portion 22b. The upper first notch 22d is located closer to the tip side and has a U-shape, and the upper first notch 22d extends in a direction parallel to the ridgeline 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 pole as the upper first tab 22a, has an upper second bent portion 24b bent at a right angle, and a flat upper upper second tip portion 24c, and has an upper second tip portion 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 notch 24d, and the upper second notch 24d is a right-angled upper second bent portion 24b. It extends in the direction parallel to the ridgeline of.

The upper bus bar 50 has an upper first stud bolt 52a, an upper second stud bolt 52b, and a U-shaped through groove 54, and the upper first stud bolt 52a has an upper first notch 22d and an upper second notch. Inserted into 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, and the third tab 26a is different from the upper second tab 24a. The upper first bent portion 22b and the upper second bent portion 24b 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, an upper first stud bolt 52a is inserted into the upper first through hole 72a, and an upper first through hole 72b is inserted into the upper second through hole 72b. , The upper second stud bolt 52b is inserted.

Here, the two laminated cells 20a and 20b constituting the secondary battery pack 10 of the present invention correspond to the first cell 22 and the second cell 24. Further, 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 of the present invention. The upper second tab 24a, the upper second bent portion 24b, the upper second tip portion 24c, and the upper second notch 24d correspond to the tip portion and the first 1-1 notch, respectively. The upper bus bar 50, the upper first stud bolt 52a, and the upper second stud bolt 52b correspond to the first and second bent portions, the first and second tip portions, and the first and second notches, respectively. Corresponding to the bus bar, the first 1-1 stud bolt, and the 1-2 stud bolt, the lower bus bar 60 corresponds to the second bus bar of the present invention, the upper insulating plate 70, the upper first through hole 72a, and the upper second. The through hole 72b corresponds to the first insulating plate, the first through hole, and the first through hole 1-2 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 into which a stud bolt can be inserted, and may be a circular or oval through hole. A U-shaped notch is preferred in terms of efficiency. Further, the stud bolt insertion portion includes a U-shaped notch and a circular or oval through hole.

Next, the tab connection method on the lower side of the two tabs will be described. 3 (a) is a plan view showing a cross section BB of the secondary battery pack of FIG. 1, and FIG. 3 (b) is a partially enlarged plan view of a D0 portion of FIG. 3 (a). c) is a partially enlarged cross-sectional view showing the cross section D1D1 of FIG. 3 (b), and FIG. 3 (d) is a partially enlarged cross-sectional view showing the cross section D2D2 of FIG. 3 (b). Is a partially enlarged side view showing the arrow D3 of FIG. 3 (b).

The other lower first tab 22e of the first cell 22 has an acutely curved lower first bent portion 22f and a flat lower first tip portion 22g, and the lower first tip portion 22g is on the lower side. It is located on the tip side of the first bent portion 22f and has a U-shaped lower first notch 22h, and the lower first notch 22h is formed on the ridgeline of the lower first bent portion 22f bent at an acute angle. It extends in parallel directions. The other lower second tab 24e of the second cell 24 has the same pole as the lower first tab 22e, and has a lower second bent portion 24f bent at a right angle and a flat lower second tip portion 24g. The lower second tip portion 24g is located on the tip side of the lower second bending portion 24f and has a U-shaped lower second notch 24h, and the lower second notch 24h is at a right angle. 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, and the lower first stud bolt 62a is provided in the lower first notch 22h and the lower second notch 24h. Inserted, the lower second stud bolt 62b is fixed to the fourth tab 28a of the fourth cell 28 adjacent to the first cell 22, and the fourth tab 28a is different from the lower first tab 22e. The lower insulating plate 80 has a lower first through hole 82a and a lower second through hole 82b, and a lower first stud bolt 62a is inserted into the lower first through hole 82a, and the lower first through hole 82a is inserted. The lower second stud bolt 62b is inserted into the two through holes 82b.

Here, the lower first tab 22e, the lower first bent portion 22f, the lower first tip portion 22 g, and the lower first notch 22h are the 2-1 tab and the 2-1 bent portion of the present invention. The lower second tab 24e, the lower second bent portion 24f, the lower second tip portion 24g, and the lower second notch 24h correspond to the second tip portion and the second notch, respectively. , 2-2 tab, 2-2 bent portion, 2-2 tip portion, 2-2 notch of the present invention, respectively, corresponding to the lower bus bar 60, the lower first stud bolt 62a, the lower side. The second stud bolt 62b corresponds to the second bus bar, the 2-1 stud bolt, and the 2-2 stud bolt of the present invention, and corresponds to the lower insulating plate 80, the lower first through hole 82a, and the lower second through. The holes 82b correspond 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 into which a stud bolt can be inserted, and may be a circular or oval through hole. A U-shaped notch is preferred in terms of efficiency. Further, the stud bolt insertion portion includes a U-shaped notch and a circular or oval through hole.

That is, when connecting a plurality of cells in parallel and in series, the tabs of the same poles of the first cell 22 and the second cell 24, which are connected in parallel to each other, are overlapped and one of the double tabs passed through the through groove 54. Is fixed between the upper bus bar 50 and the upper insulating plate 70 with the upper first stud bolt 52a, and the other double tab is attached to the lower bus bar 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 having a different pole are connected to the upper bus bar 50 with the upper second stud bolt 52b. The other double tab fixed between the lower bus bar 60 and the lower insulating plate 80 and the fourth tab 28a of the fourth cell 28 of the different pole, fixed between the upper insulating plate 70 and the lower insulating plate 80, are placed below. It is fixed between the lower bus bar 60 and the lower insulating plate 80 with the side second stud bolt 62b.

The tab adjacent to the lower second tab 24e of the second cell 24 and the tab different from the lower second tab 24e are described in FIG. 3A so as to be in contact with the lower second tab 24e. However, it is necessary to attach an insulating tape or the like to the contact surfaces of the tabs of the different poles and at least one of the lower second tabs 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 material having high conductivity, but copper, aluminum and the like 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 having low conductivity, but styrene resin, phenol resin, PBT (polybutylene terephthalate) resin and the like are preferable, and PBT resin is more preferable. preferable. When the upper insulating plate 70 and the lower insulating plate 80 are elastically or plastically deformed to loosen the nuts of the stud bolts, the upper first stud bolt 52a and the upper first through hole of the upper insulating plate 70 are formed. Between the upper second stud bolt 52b and the upper second through hole 72b of the upper insulating plate 70, 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 tab positions can be adjusted in advance. Therefore, the secondary battery pack of the present invention is a cell replacement operation. Not only efficiency but also cell assembly efficiency and quality can be improved. Also, if the tip of each tab has a U-shaped notch, the bus bar and insulating plate can be removed and attached to the tab by loosening the nut of the stud bolt a little. The secondary battery pack of the present invention can improve the work efficiency of cell replacement.

In the above description, the expressions "upper side" and "lower side" are used to distinguish between the two tabs of the first cell 22 and the two tabs of the second cell 24, the two bus bars, and the two insulating plates. The secondary battery pack of the above is not limited to the upper side and the lower side, and may be arranged on the horizontal plane, for example, on the left side and the right side, and the upper side and the lower side are completely reversed, for example, the upper side first tab 22a. May be physically placed on the lower side, and the lower first tab 22e may be physically placed on the upper side. Further, 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 tabs, that is, the upper first tab 22a and the upper second tab 24a, respectively. , The lower tabs, i.e., the lower first tab 22e and the lower second tab 24e, respectively. Similarly, the 2-1 tab and the 2-2 tab are the lower tabs. That is, it is not limited to corresponding to the lower first tab 22e and the lower second tab 24e, respectively, and may correspond to the upper tabs, 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 protrusion 74 and a limiting means (not shown), in which case the limiting means is an upper bus bar. Limit the deviation of position and angle relative to 50. The limiting means is, for example, a pin fixed to the upper bus bar 50 and a hole of the upper insulating plate 70 fitted to the pin, and a hole provided in the upper bus bar 50 and a hole of the upper insulating plate 70 fitted to the hole. It is a protrusion and is a side wall extending from the upper insulating plate 70 so as to cover the cut surface of the upper bus bar 50 and the cut surface thereof.

That is, if the nut of the upper first stud bolt 52a is not 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 nut of the stud bolt is tightened. Therefore, the secondary battery pack of the present invention has not only the work efficiency of cell replacement but also the cell assembly efficiency. And the 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 voltage 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, or the like. Become.

With such a configuration, the contact state of the probe for the measuring device 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 which case the upper terminal plate 90 includes an upper bus bar 50 and an upper insulating plate 70. 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 are connected cables to a circuit for adjusting the voltage balance between the first cell 22 and the second cell 24. Is connected.

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

That is, it is not necessary to directly connect the connection cable 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 material having high conductivity, but copper, aluminum and the like are preferable, and aluminum is more preferable.

With such a configuration, the connection cable can be assembled after being soldered in advance in a separate process, so that the secondary battery pack of the present invention can improve the 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 direction and angle at which the upper first bent portion 22b of the upper first tab 22a is bent at an acute angle are the lower first tab 22e. The direction and angle of bending at an acute angle of the lower first bent portion 22f may be the same, and the direction and angle of bending at a right angle of the upper second bent portion 24b of the upper second tab 24a is the lower second. It may be the same as the direction and angle of bending at a right angle of the lower second bent portion 24f of the tab 24e.

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

With such a configuration, the shapes of the assembly jig and the transport tray are simplified, so that the secondary battery pack of the present invention can improve the 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. In that case, the flat side sheet 20f has a peripheral portion and a central portion in the same plane, and the raised side sheet 20p has a raised central portion with respect to the peripheral portion. In the second cell 24, the raised side sheet 20p of the second cell 24 is arranged so as to face the flat side sheet 20f of the adjacent first cell 22, and the third cell 26 is the flat side sheet of the third cell 26. 20f is arranged so as to face the flat side sheet 20f of the adjacent second cell 24, and in the fourth cell 28, the raised side sheet 20p of the fourth cell 28 is adjacent to the raised side sheet 20p of the first cell 22. It is arranged so as to face the.

That is, when constructing a circuit for connecting the first cell 22 and the second cell 24 connected in parallel to each other in series between the third cell 26 and the fourth cell 28 connected in series with each other, first, the tab A cell having the same positive electrode / negative electrode arrangement and tab notch direction as the first cell 22 is manufactured as the second cell 24, and the tab positive / negative electrode arrangement is the same as the first cell 22 and the tab notch direction is The cells opposite to the first cell 22 are manufactured as the third cell 26 and the fourth cell 28, and then the flat side sheet 20f and the raised side sheet 20p are laminated in the same arrangement as the third cell 26 and the third cell 26. The first cell 22 and the second cell 24, in which the flat side sheet 20f and the raised side sheet 20p are laminated in the same arrangement as each other, are arranged between the four cells 28, and the flat side sheet 20f and the raised side sheet 20p are arranged in opposite directions. It will be better if it is laminated.

With such a configuration, it is only necessary to manufacture two types of cells in which only the direction of the tab notch is different. As a result, the shapes of the assembly jig and the transport tray are simplified, and thus the secondary of the present invention. The battery pack can improve the assembly efficiency and quality of the cell.
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 changes may be made without departing from the gist of the present invention. be.

The secondary battery pack of the present invention has the effect of reducing the number of parts and simplifying the cooling structure of the cell, and has a cooling capacity equal to or higher than that of the conventional one, and can be used even in a high temperature environment. , The work efficiency of cell replacement can be improved, the cell assembly efficiency and quality can be improved, and the quality can be easily confirmed, which is industrially useful.

10 Rechargeable battery pack 20, 20a, 20b Laminated cell 20f Flat side sheet 20p Raised side sheet 22 1st cell 22a Upper 1st tab (1-1st tab)
22b Upper first bent part (1-1 bent part)
22c Upper first tip (1-1 tip)
22d Upper 1st notch (1-1st notch)
22e Lower 1st tab (2-1 tab)
22f Lower first bent part (2-1 bent part)
22g Lower 1st tip (2-1 tip)
22h Lower 1st notch (2-1 notch)
24 2nd cell 24a Upper 2nd tab (1-2 tabs)
24b Upper second bent part (1-2 bent part)
24c Upper second tip (1-2 tip)
24d Upper second notch (1-2 notch)
24e Lower 2nd tab (2-2 tabs)
24f Lower second bent part (2-2 bent part)
24g Lower 2nd tip (2-2 tip)
24h Lower 2nd notch (2-2 notch)
26 3rd cell 26a 3rd tab 28 4th cell 28a 4th tab 30 Cooling plate 32 Contact part 34 Protruding part 34a Protruding part 40 Housing 42 Bottom wall 42a Through hole 44 Protective wall 44a Air flow path 50 Upper bus bar (1st) Bus bar)
52a Upper 1st stud bolt (1-1st stud bolt)
52b Upper second stud bolt (1-2 stud bolt)
54 Through groove 60 Lower bus bar (second bus bar)
62a Lower 1st stud bolt (2-1 stud bolt)
62b Lower 2nd 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 plate (1st terminal plate)
100 Lower terminal plate (second terminal plate)

Claims (6)

Multiple laminated flat cells and laminated flat cells
A contact portion individually arranged between two adjacent laminated cells in the plurality of laminated cells and a protrusion extending from the contact portion in a direction perpendicular to the laminating direction of the plurality of laminated cells. Multiple individually prepared cooling plates and
It has a fixing portion for fixing the plurality of laminated cells, a bottom wall having a plurality of through holes through which a part of the protrusions of each cooling plate individually penetrates, and a housing provided with a protective wall.
The protrusion of each cooling plate comprises a protrusion protruding from each through hole of the bottom wall.
The protective wall is a secondary battery pack that protects the protruding portion of each cooling plate and forms an air flow path for cooling the protruding portion. The secondary battery pack according to claim 1, wherein each cooling plate has two heat radiating sheets, and the two heat radiating sheets are individually attached to the surfaces on both sides. The secondary battery pack according to claim 1 or 2, wherein each cooling plate has a plurality of protrusions. The two laminated cells are a first cell and a second cell each having two tabs and fixed to each other.
The secondary battery pack further includes a first bus bar and a second bus bar each having two stud bolts, and a first insulating plate and a second insulating plate having two through holes, respectively.
One of the 1-1 tabs of the first cell includes a 1-1 bent portion bent at an acute angle and a 1-1 stud bolt insertion portion located on the tip side of the 1-1 bent portion. Has a flat first 1-1 tip,
One of the 1-2 tabs of the second cell is the same pole as the 1-1 tab, and is located on the tip side of the 1-2 bent portion and the 1-2 bent portion bent at a right angle. Have a flat 1-2 tip with a 1-2 stud bolt insertion part to
The first bus bar is the first of the 1-1 stud bolt insertion portion, the 1-1 stud bolt inserted into the 1-2 stud bolt insertion portion, and the third cell adjacent to the second cell. It has a 1-2 stud bolt fixed to a 1-2 tab and a 3rd tab of a different pole, 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 includes a 2-1 bent portion bent at an acute angle and a 2-1 stud bolt insertion portion located on the tip side of the 2-1 bent portion. Has a flat second 2-1 tip and
The other 2-2 tab of the 2nd cell is the same pole as the 2-1 tab, and is located on the tip side of the 2-2 bent portion bent at a right angle and the 2-2 bent portion. 2-2 has a flat 2-2 tip with a stud bolt insertion part
The second bus bar is the same as the 2-1 stud bolt insertion portion, the 2-1 stud bolt inserted into the 2-2 stud bolt insertion portion, and the fourth cell adjacent to the first cell. It has a 2nd-2 stud bolt that is fixed to the 2nd tab and the 4th tab of a different pole.
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. The secondary battery pack according to any one of 3 to 3. The secondary battery pack according to claim 4, wherein the first insulating plate has a protrusion for preventing rotation and a limiting means for limiting a deviation in a relative position and angle with respect to the first bus bar. The secondary battery pack according to claim 4 or 5, wherein each of the first insulating plate and the second insulating plate has a through hole for voltage measurement.

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