JP2015115150A - Power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To connect a terminal electrode while reducing cost by using an inexpensive concatenation fitting without using a flexible cable or the like for connecting the terminal electrode of a battery pack.SOLUTION: A power storage device includes a plurality of battery packs 21 which are fixed on a shelf board of a power storage rack, and in an end plate member 23 of the battery pack 21, a battery terminal 26 is provided in which a screw hole 31 is formed. The battery terminal 26 is connected by two electrification fittings 32. The electrification fitting 32 is formed of a main electrification piece 33 in which a main through hole is formed through which a horizontal screw member 35 penetrates; and a sub electrification piece 34 in which a sub through hole is formed through which a vertical screw member 37 penetrates. The main through hole and the sub through hole have a diameter larger than an outer diameter of the screw members 35 and 37 and battery terminals of two battery packs 21 are connected while absorbing mounting position errors of the battery packs 21 by means of the electrification fittings 32.

Description

  The present invention relates to a power storage device in which a large number of battery packs are accommodated in a power storage rack.

  In factories and office buildings, power is backed up when power usage reaches its peak, and when battery usage is low, battery packs equipped with battery cells such as lithium ion secondary batteries and lithium ion capacitors are charged. A power storage device is provided. When backing up power in a factory or office building, the power storage device is usually arranged in a power supply room provided in a building such as a factory. If the container equipped with the power storage device is arranged adjacent to the factory building, the power can be backed up at the peak of power use in the production facilities of the factory.

  When the power storage device is mounted on the container, the container can be transported by land using a trailer or can be transported by sea using a ship, and power can be backed up against a power load when a power failure occurs.

  Patent Document 1 describes an assembled battery mounted on a hybrid vehicle or an electric vehicle, and the assembled battery is formed by arranging a plurality of single cells side by side. A rod-shaped bus bar is used to connect the battery terminal on the positive electrode side and the battery terminal on the negative electrode side of the cells arranged adjacent to each other. In this assembled battery, the bus bar is welded to the battery terminal. ing.

  On the other hand, the power storage device includes a battery pack including a battery cell such as a secondary battery, that is, a housing for storing a single battery, that is, a power storage rack. The power storage rack is provided with a plurality of shelf boards, each battery pack is fixed on the shelf board, and the battery terminals of the battery pack are connected by an energizing member.

JP 2013-93287 A

  As a battery pack used for a power storage device, there is a form in which end plate members are fixed to both ends of a plurality of cylindrical battery cells, and the end plate members are rectangular. The battery pack of this embodiment is arranged on the shelf plate of the power storage rack and fixed to the shelf plate so that the battery cells are in the horizontal direction. Under the state where the battery pack is disposed on the shelf board, the battery pack is positioned and fixed at a predetermined position with the lower side of the end plate member in contact with the shelf board. In order to connect the battery terminals of the battery packs that are vertically adjacent to each other via the shelf board, an energization member is connected to the battery terminals.

  In a power storage device in which a plurality of battery packs are mounted on a power storage rack, if any battery pack malfunctions, it needs to be replaced. Therefore, unlike the assembled battery for automobiles, the bus bar cannot be welded to the battery terminal of the battery pack in the power storage device, and it is necessary to be able to remove the bus bar from the battery terminal.

  For this reason, a flexible cable having flexibility and a rigid bus bar, that is, a current-carrying metal fitting, are used as the current-carrying member of the power storage device, and the current-carrying member is fastened to the battery terminal by a screw member. When a flexible cable is used as the energizing member, the battery terminals can be connected to each other even if an attachment error occurs at the fixed position of the battery pack. However, in order to increase the connection strength of the battery pack and to enable connection with a low-cost energizing member, it is desirable to use a rigid energizing metal fitting as the energizing member.

  However, if the battery terminals are connected to each other using a rigid energizing metal fitting, for example, if there is a dimensional error or assembly error of the power storage rack, distortion of the shelf board due to the weight of the battery pack, etc. If the current-carrying metal fitting is connected to the battery terminal in this state, an excessive force is applied to the battery terminal and the battery terminal may be deformed.

  An object of the present invention is to connect the terminal electrodes while reducing the cost by using an inexpensive coupling fitting without using a flexible cable or the like for connecting the terminal electrodes of the battery pack.

  The power storage device of the present invention is a power storage device having a power storage rack provided with a plurality of shelves spaced in the vertical direction, and a plurality of battery packs fixed on the shelf plate, Main terminals that are provided above and below the end plate members of the respective battery packs, each having a screw hole formed therein, and a horizontal screw member that abuts against the battery terminal and is screwed into the screw hole pass therethrough. A sub-energization formed by bending a main current-carrying piece having a hole and a sub-through hole through which a vertical screw member passes integrally with the main current-carrying piece at different angles with respect to the main current-carrying piece. A large-diameter portion larger than the outer diameter of the horizontal screw member on the inner diameter of the main through-hole, and the inner diameter of the sub-through hole from the inner diameter of the vertical screw member. The large diameter part is also provided, and the sub-energizing pieces are mutually connected By two of the current fitting coupled, while absorbing mounting position error of the battery pack, and to connect the battery terminals of two of said battery pack adjacent vertically through the shelves.

  In the power storage device of the present invention, a plurality of battery packs are fixed to the power storage rack, and the battery terminals of adjacent battery packs are connected to each other by two current-carrying metal fittings via shelf boards. Each energizing metal fitting has a main energizing piece abutted on the battery terminal and a sub-energizing piece bent so that the main through hole and the sub through hole formed in the main energizing piece have different angles. The main current-carrying piece is fastened to the battery terminal by a horizontal screw member, and the sub-current-carrying pieces of the two current-carrying metal fittings are fastened by the vertical screw member. The two current-carrying brackets are movable in a three-dimensional direction with respect to the horizontal screw member and the vertical screw member, and even if there is an error in the mounting position of the battery pack with respect to the storage rack, the error is corrected by two currents. Metal fittings absorb. Thereby, even when an error occurs in the attachment position of the battery pack, the connection strength of the battery pack can be increased without applying a load to the battery terminal. Moreover, a battery terminal can be connected by a low-cost energizing member by using the energizing metal fitting.

It is a front view which shows the electric power storage apparatus which is one Embodiment. It is a right view of FIG. It is a top view of FIG. It is the A section enlarged front view of FIG. It is the BB sectional view taken on the line of FIG. It is a perspective view which shows two battery packs connected by the electricity supply metal fitting. It is an exploded perspective view shown in the state where two energization metal fittings were separated. It is a disassembled perspective view shown in the state where the modification of two energization metal fittings was separated. (A), (B) is a perspective view shown in the state which matched other modifications of two electricity supply metal fittings, respectively.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 to 5, the power storage device 10 includes a housing, that is, a power storage rack 11. The power storage rack 11 has left and right side walls 12, 13, a back wall 14, and a top wall 15. On the front side, an open / close door 16 indicated by a two-dot chain line in FIG. The power storage rack 11 has side walls 12 and 13, a back wall 14, and a top wall 15, which are fixed to pillars 17 at four corners, and are generally rectangular parallelepiped. The two doors 16 on the front side can be opened and closed by hinges. 1 shows a state where the door 16 is removed, FIG. 2 shows a state where the side wall 13 is removed, and FIG. 3 shows a state where the top wall 15 is removed.

  As shown in FIG. 1 and FIG. 2, the power storage rack 11 is provided with a plurality of shelf boards 18 spaced in the vertical direction. As shown in FIG. 2, a shelf fixing bracket 19 is fixed to the right side of the storage rack 11 so as to extend in the front-rear direction, and a shelf fixing bracket 19 is similarly fixed to the left side of the storage rack 11. As shown in FIG. 1, both end portions of the shelf plate 18 are fixed to shelf plate fixing brackets 19 corresponding to the left-right direction. In the power storage rack 11 shown in the figure, seven shelf plates 18 are provided, but the number of the shelf plates 18 is not limited to seven, and can be an arbitrary number.

  Four battery packs 21 are attached to each shelf board 18. Each battery pack 21 has a plurality of battery cells 22 as shown in FIG. Each battery cell 22 is composed of a cylindrical lithium ion secondary battery, and both end surfaces are fixed to the rectangular end plate members 23 and 24 from the front and back, and the battery cells 22 are electrically connected in series. . The front and rear end plate members 23 and 24 are connected by fastening rods 25 at four corners. The battery pack 21 includes a plurality of battery cells 22, end plate members 23 and 24 made of an insulating material, and a plurality of fastening rods 25. And formed. Each battery pack 21 has six battery cells 22, but the number of battery cells 22 provided in one battery pack 21 is not limited to six and can be any number. . The battery pack 21 may have a structure in which the front and rear end plate members 23 and 24 are added to the fastening rod 25 or are connected by a frame member instead of the fastening rod 25.

  The battery pack 21 is fixed to the shelf plate 18 with one end plate member 23 being the front side. The end plate member 23 on the front side is provided with battery terminals 26 at the upper and lower portions on one end side, and the end plate member 23 is a terminal plate. One battery terminal 26 is a terminal having one polarity of battery cells 22 connected in series, and the other battery terminal 26 is a terminal having the other polarity. Each battery terminal 26 is attached to a notch 27 provided in the end plate member 23.

  The battery pack 21 is vertically symmetrical. As shown in FIG. 6, the battery pack 21 can be fixed to the shelf plate 18 with the battery terminal 26 on the right side, and the battery pack 21 is in the state shown in FIG. 6. When rotated 180 degrees, the battery terminal 26 can be fixed to the shelf board 18 with the battery terminal 26 on the left side. In order to fix each battery pack 21 to the shelf board 18, a battery fixing bracket 28 fixed to the shelf board 18 is fixed to the battery pack 21 as shown in FIG. 4.

  Battery packs 21 are fixed to the storage rack 11 in rows in the vertical direction. In the power storage rack 11 shown in FIG. 1, battery packs 21 are arranged in four rows in the vertical direction. In FIG. 1, the rightmost battery pack 21 is arranged so that the battery terminals 26 are on the left side, and a first battery pack row 21 a is formed. The battery pack 21 on the left side of the battery pack row 21a is arranged so that the battery terminal 26 is on the right side, and a second battery pack row 21b is formed. On the other hand, the leftmost battery pack 21 is arranged such that the battery terminal 26 is on the right side, and a fourth battery pack row 21d is formed. The battery pack 21 on the right side of the battery pack row 21d is arranged so that the battery terminal 26 is on the left side, and a third row of battery pack rows 21c is formed. Thus, each battery pack 21 is fixed to the shelf board 18 so that the battery terminals 26 are adjacent to each other.

  As shown in FIG. 6, a screw hole 31 is formed in the battery terminal 26. As shown in FIG. 7, the battery terminals 26 of the two battery packs 21 adjacent to each other in the vertical direction are connected by two L-shaped bus bars having the same shape, that is, current-carrying metal fittings 32. Each energizing metal fitting 32 is integrated with the main energizing piece 33 abutted against the battery terminal 26 and the main energizing piece 33 and is bent at a right angle with respect to the main energizing piece 33 so as to face the front-rear direction of the storage rack 11. The auxiliary current carrying piece 34 is formed of a copper alloy.

  The main energization piece 33 is formed with a main through hole 36 through which a horizontal screw member 35 screwed into a screw hole 31 formed in the battery terminal 26 passes. On the other hand, a sub through hole 38 through which the vertical screw member 37 passes is formed in the sub current passing piece 34, and the sub current passing piece 34 has a main angle so that the sub through hole 38 is at a different angle with respect to the main through hole 36. The energization piece 33 is bent. By passing the main through hole 36 and screwing the horizontal screw member 35 into the screw hole 31 of the battery terminal 26, the energizing bracket 32 is fixed to the battery terminal 26. When the current-carrying metal fittings 32 are fixed to two vertically adjacent battery packs 21, as shown in FIGS. 6 and 7, the sub-energization pieces 34 of the respective current-carrying metal fittings 32 face each other. The current-carrying metal fittings 32 fixed to the two battery packs 21 adjacent to each other in the vertical direction are connected to each other by fastening the auxiliary current-carrying pieces 34 with the vertical screw members 37 and the nuts 39. Reference numeral 40 denotes a washer.

  The horizontal screw member 35 and the vertical screw member 37 are bolts having the same effective outer diameter, and the effective inner diameter of the screw hole 31 is the same as the effective outer diameter of the horizontal screw member 35. On the other hand, when the outer diameters of the horizontal screw member 35 and the vertical screw member 37 are d, the inner diameter D of the main through hole 36 and the sub through hole 38 is a circular hole larger than the outer diameter d. As described above, when the inner diameter D of the main through hole 36 and the sub through hole 38 is larger than the outer diameter d of the screw member, the main through hole 36 and the sub through hole 38 are fixed to the shelf 18 adjacent to each other via the shelf 18. As shown in FIG. 6, even if the mounting positions of the two battery packs 21 are shifted in any of the vertical direction (Z direction), the left and right (Y direction), and the front and rear (X direction) from the set position, The battery terminals 26 of the two battery packs 21 can be connected while absorbing the mounting position error in the three-dimensional direction of the battery pack 21 by the current-carrying metal fitting 32 connected at the sub-energization piece 34. The dimensional difference between the inner diameter D and the outer diameter d is set assuming the maximum value of the mounting error of the battery pack 21 with respect to the shelf plate 18. The dimensional difference can be about several mm.

  In order to connect the battery terminals 26 of the battery packs 21 adjacent to each other in the vertical direction via the shelf board 18 by the current-carrying metal fittings 32, for example, the sub-through holes 38 are brought into contact with the sub-electric current pieces 34 of the two current-carrying metal parts 32. The vertical screw member 37 is passed through and the two current-carrying metal fittings 32 are temporarily fixed by the nut 39 to be connected. Next, the two current-carrying metal fittings 32 are brought into a vertical state, and the horizontal screw member 35 is screwed to the lower battery terminal 26 of the upper battery pack 21, and the upper current-carrying metal fitting 32 is temporarily fixed to the battery pack 21. . Further, the horizontal screw member 35 is screwed to the upper battery terminal 26 of the lower battery pack 21, and the lower energization fitting 32 is temporarily fixed to the battery pack 21. The upper and lower battery terminals 26 are connected to each other by a total of three screw members 35 and 37 by fastening the respective screw members 35 and 37 in a state in which the current-carrying metal fittings 32 are temporarily fixed to the battery pack 21. The

  Under the state in which the two current-carrying metal fittings 32 are temporarily fixed to the two battery packs 21 by the screw members 35 and 37, the upper and lower battery packs 21 are at least one of the three-dimensional directions of the upper, lower, left, and right directions and the front-rear direction. Even if the main through hole 36 and the sub through hole 38 are deviated from the predetermined mounting position in that direction, the outer diameters of the screw members 35 and 37 are larger than the outer diameters of the screw members 35 and 37. The error of the mounting position in the three-dimensional direction is absorbed. By connecting the screw members 35 and 37, the connection work is completed. Therefore, even if the battery terminals 26 of the upper and lower battery packs 21 are firmly connected by the two energization fittings 32 at the position where the two battery packs 21 are actually fixed, a load is applied to the battery terminals 26 from the energization fittings 32. It is prevented. This prevents a load from being applied to the battery terminal 26 due to an attachment error of the battery pack 21, so that the battery terminal 26 can be prevented from being deformed even if the screw member is firmly screwed. Further, when the screw members 35 and 37 are fastened, the screw members 35 and 37 can be easily fastened, and the upper and lower battery terminals 26 can be easily connected by the two current-carrying fittings 32.

  In this way, by connecting the battery terminals 26 of the two battery packs 21 adjacent in the vertical direction using the two current-carrying metal fittings 32 having the same shape, all the current-carrying metal fittings 32 having the same shape without increasing the number of parts. Thus, a large number of battery packs 21 can be connected. While fixing each battery pack 21 to the shelf 18 with the battery fixing bracket 28 and connecting the battery packs 21 with the current-carrying bracket 32, the battery pack 21 is connected using a flexible cable, The attachment strength of the battery pack 21 can be increased by a low-cost member.

  In each of the battery pack rows 21a to 21d in the first row to the fourth row, when the battery terminals 26 of the two adjacent battery packs 21 are connected to each other via the shelf plate 18 in the vertical direction, the battery packs 21 in the respective rows are connected. Are connected in series. The battery terminals 26 on the lower side of the lowermost battery pack 21 of the first row of battery packs 21a and the second row of battery packs 21b are connected to each other by an unillustrated metal fitting, and the second row of batteries. The battery terminals 26 of the uppermost battery pack 21 of the pack row 21b and the third row of battery pack rows 21c are connected to each other by a current-carrying metal fitting (not shown), and the third row of battery pack rows 21c and When the battery terminals 26 on the lower side of the lowermost battery pack 21 in the fourth battery pack row 21d are connected to each other by an unillustrated metal fitting, all the battery packs 21 in the four rows are connected in series.

  The horizontal screw member 35 and the vertical screw member 37 are bolts having the same outer diameter, but the horizontal screw member 35 and the vertical screw member 37 may be screw members having different outer diameters. Further, the main through hole 36 and the sub through hole 38 are respectively circular holes, and the entire inner peripheral surface is a large diameter portion larger than the outer diameter of the screw member. If the mounting position error in the three-dimensional direction can be absorbed, one of the main through hole 36 and the sub through hole 38 may be a long hole, and the other may be a circular hole having a larger diameter than the outer diameter of the screw member. .

  FIG. 8 is an exploded perspective view showing a modified example of two current-carrying metal parts separated from each other. In the energizing metal fitting 32 shown in FIG. 8, the main through hole 36 is formed by a long hole extending in the horizontal direction, and the long diameter of the long hole has a large diameter portion. On the other hand, the sub through hole 38 has a larger diameter than the outer diameter of the vertical screw member 37, as in the case shown in FIG. As described above, when the main through hole 36 is a long hole extending in the horizontal direction, an error in the mounting position of the battery pack 21 in the vertical direction (Z direction) and the horizontal direction (Y direction) is absorbed by the main through hole 36. Further, the error in the mounting position in the left-right direction (Y direction) and the front-rear direction (X direction) is absorbed by the sub through hole 38.

  If the main through hole 36 is a long hole extending in the vertical direction, similarly, an error in the mounting position of the battery pack 21 in the vertical direction (Z direction) can be absorbed by the main through hole 36. At that time, the sub through hole 38 is formed by a circular hole having a diameter larger than the outer diameter of the vertical screw member 37. Further, even if the sub through hole 38 is a long hole extending in the front-rear direction or the left-right direction, an error in the mounting position can be similarly absorbed. At that time, the main through hole 36 is a circular hole having a diameter larger than the outer diameter of the horizontal screw member 35. For example, if the sub through-hole 38 is a long hole extending in the front-rear direction (X direction), errors in the front-rear direction (X direction) can be absorbed by the sub through-hole 38, and the left-right direction (Y direction) can be absorbed by the main through-hole 36. ) And vertical direction (Z direction) errors can be absorbed.

  FIGS. 9A and 9B are perspective views showing a state in which other modifications of the two current-carrying metal fittings are brought into contact with each other. In the energizing metal fitting 32 shown in FIG. 9A, the auxiliary energizing piece 34 is bent in the front-rear direction with respect to the main energizing piece 33 and is inclined at an angle α in the left-right direction when viewed from the front. As described above, when the auxiliary energization piece 34 is inclined in the left-right direction, the vertical screw member 37 is inclined in accordance with the angle of the auxiliary energization piece 34 when the vertical screw member 37 is attached to the auxiliary through hole 38. It will be inserted into the sub through hole 38. Thereby, the vertical screw member 37 can be attached while avoiding interference with other members provided on the upper side of the sub-energization piece 34. For example, the inclination angle α can be set to about 45 degrees. In the energizing metal fitting 32 shown in FIG. 9 (A), it is inclined rightward when viewed from the front at an inclination angle α, but it may be inclined leftward when viewed from the front.

  On the other hand, in the energization fitting shown in FIG. 9B, the first energization fitting 32a and the second energization fitting 32b are paired. The current-carrying metal fitting 32a is formed such that the sub-current-carrying piece 34 is bent in the front-rear direction with respect to the main current-carrying piece 33 and is inclined at an angle θ1 in the vertical direction when viewed from the side. On the other hand, in the energizing metal fitting 32b, the auxiliary energizing piece 34 is bent in the front-rear direction with respect to the main energizing piece 33 and is inclined at an angle θ2 in the up-down direction when viewed from the side. When attaching the current-carrying metal fittings 32a and 32b to the two battery packs 21 adjacent to each other vertically, as shown in FIG. 9B, the current-carrying metal fitting 32a may be on the upper side, and conversely, good.

  The horizontal direction and the vertical direction described above indicate directions in a state where the current-carrying metal fitting 32 is attached to the battery pack 21. Further, the horizontal screw member 35 and the vertical screw member 37 are also directions in a state where they are attached to the current-carrying metal fitting 32. Even when the auxiliary current-carrying piece 34 is inclined in the horizontal direction or the vertical direction as shown in FIG. A screw member used for fastening the current-carrying piece 34 is referred to as a vertical screw member 37.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, the shape of the battery cell 22 is not limited to a cylindrical shape, and may be a square tube shape having a square cross section on the outer peripheral surface. Further, as the structure of the power storage rack 11, there are four columns, front, rear, left and right, and a shelf plate 18 is attached between the left and right columns, and the left and right side walls 12, 13 and the back wall 14 are not used. It is also good.

DESCRIPTION OF SYMBOLS 10 Electric power storage apparatus 11 Electric storage rack 12, 13 Side wall 14 Back wall 15 Top wall 16 Opening / closing door 18 Shelf board 19 Shelf board fixing bracket 21 Battery pack 21a-21d Battery pack row | line | column 22 Battery cell 23, 24 End plate member 25 Fastening rod 26 Battery terminal 27 Notch portion 28 Battery fixing bracket 31 Screw hole 32 Current-carrying bracket 33 Main current-carrying piece 34 Sub-current-carrying piece 35 Horizontal screw member 36 Main through-hole 37 Vertical screw member 38 Sub-through-hole 39 Nut 40 Washer

Claims (4)

A power storage device having a power storage rack provided with a plurality of shelves spaced in the vertical direction, and a plurality of battery packs fixed on the shelves,
Battery terminals provided on the top and bottom of the end plate members of the respective battery packs, each having a screw hole,
A main energizing piece formed with a main through-hole through which a horizontal screw member abutted against the battery terminal and screwed into the screw hole passes, and a sub-thread through which a vertical screw member penetrates integrally with the main energizing piece. An energization fitting made of a sub-energization piece formed by being bent so that a through hole has a different angle with respect to the main energization piece,
Providing a large diameter portion larger than the outer diameter of the horizontal screw member on the inner diameter of the main through hole, and providing a large diameter portion larger than the inner diameter of the vertical screw member on the inner diameter of the sub through hole;
The battery terminals of two battery packs that are vertically adjacent to each other are connected through the shelf plate while the mounting position error of the battery pack is absorbed by the two current-carrying metal parts that are connected to each other by the sub-energization pieces. A power storage device.   The power storage device according to claim 1, wherein the main through hole is a circular hole having a larger diameter than the outer diameter of the horizontal screw member, and the sub through hole is a circular having a larger diameter than the outer diameter of the vertical screw member. A power storage device that is a hole.   2. The power storage device according to claim 1, wherein the main through hole is a long hole having a large diameter portion extending in a horizontal direction or a vertical direction, and the sub through hole is a circle having a diameter larger than an outer diameter of the vertical screw member. A power storage device that is a hole.   2. The power storage device according to claim 1, wherein the main through hole is a circular hole having a diameter larger than an outer diameter of the horizontal screw member, and the sub through hole has a long diameter portion extending in a horizontal direction or a vertical direction. A power storage device that is a hole.

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