JP6611226B2 - Storage device seal structure - Google Patents

Description

  The present invention relates to a sealing structure of a power storage device, and more particularly, to exhibit the sealing function of a cell accommodated in the power storage device, and to align and position the cell, so that the mounting operation of the cell is extremely simple. The present invention relates to a seal structure of a power storage device that can be performed.

  In recent years, as a power storage device (capacitor or battery) for a vehicle such as a hybrid vehicle, a device in which a plurality of cells are mounted in a case is known. Since the cells need to be cooled, they are arranged in parallel in the housing so as to leave a gap between adjacent cells.

  In Patent Document 1, a holder member having a holding portion for each cell is mounted on the upper and lower sides of each flat cell (battery) constituting the assembled battery, and a bar-like spacer of a comb-like interval holding portion is attached to each cell. It is described that two end plates are fixed between holder members while all the cells are integrated between the end plates in a state in which the gap between adjacent cells is maintained by being inserted therebetween.

  In Patent Document 2, a battery holder that holds the four corners of each cell (cell) is sandwiched between all the cells, all cells are sandwiched between two end plates, and both end plates are sandwiched between shafts. It is described to be integrated by wearing.

  Patent Document 3 describes that a plurality of cells are integrated by a belt-like restraining member in a state where a heat transfer plate is sandwiched between secondary batteries (cells).

  Patent Document 4 describes that a plurality of secondary battery modules (cells) are integrally molded with resin.

JP 2012-59581 A WO2012 / 147150 JP 2014-99354 A Japanese Patent Laying-Open No. 2015-8071

  In the ones described in Patent Documents 1 to 3, a dedicated member is required to maintain the spacing between the cells, and the dedicated member must be mounted between the cells. Is complicated.

  On the other hand, in Patent Document 4, since a plurality of cells are integrally molded with resin, it is not possible to replace the cells.

  Further, none of them has a function of sealing against the cell and backing up against leakage of gas or electrolyte.

  Accordingly, the present invention provides a sealing structure for a power storage device that can exhibit a cell sealing function with a seal packing, can align and position a cell, and can perform a cell mounting operation very easily. The issue is to provide.

  The other subject of this invention becomes clear by the following description.

  The above problems are solved by the following inventions.

1. A plurality of cells are juxtaposed in a housing made up of a cover and a case, and a packing mounting portion is provided on the cover, and a space between the plurality of cells is sealed by a seal packing mounted in the packing mounting portion. A sealing structure of the device,
The seal packing is
A packing body mounted in the packing mounting portion;
A plurality of insertion openings provided in the packing main body and into which the cells are respectively inserted;
A first lip provided on the inner peripheral surface of each of the insertion ports so as to be inclined along the insertion direction of the cells;
A second lip portion provided on the outer peripheral surface of the packing body so as to be inclined along a direction opposite to the insertion direction of the cells;
By mounting the seal packing in the packing mounting portion, the second lip portion is in contact with the inner peripheral surface of the packing mounting portion and sealed,
When the cells are respectively inserted into the insertion openings, the first lip portion is in contact with the outer peripheral surface of the cell and seals between the outer peripheral surfaces, and the cell is positioned. The seal structure of the electrical storage device.

2. The seal packing has an interval holding part that regulates a space between adjacent cells between the adjacent insertion ports,
2. The seal structure for a power storage device according to claim 1, wherein the gap holding portion is formed to be higher than the packing body.

  3. 3. The above 1 or 2, wherein an engagement protrusion is provided on the packing mounting portion, and an engagement groove is formed on the lower surface of the seal packing to engage with the engagement protrusion. Power storage device seal structure.

  4). The power storage device seal structure according to claim 1, wherein the cell is a battery cell or a capacitor cell.

  According to the present invention, there is provided a sealing structure for a power storage device capable of exerting a cell sealing function by a seal packing, aligning and positioning a cell, and performing a cell mounting operation very easily. Can be provided.

1 is an exploded perspective view of a power storage device to which a seal packing according to the present invention is applied. The perspective view which shows the state with which the cell was mounted | worn with the duct cover (A) is a top view which shows the seal packing which concerns on this invention, (b) is the bottom view. Sectional drawing which follows the (iv)-(iv) line | wire in FIG.3 (b) (A) is a figure explaining a mode that the seal packing shown in FIG.3 and FIG.4 is mounted to a duct cover, (b) is a figure explaining a mode that a cell is inserted in the seal packing shown in FIG.3 and FIG.4.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 is an exploded perspective view of a power storage device to which a seal packing according to the present invention is applied, FIG. 2 is a perspective view showing a state in which cells are mounted on a duct cover, and FIG. 3A is a seal packing according to the present invention. FIG. 4B is a bottom view thereof, FIG. 4 is a cross-sectional view taken along line (iv)-(iv) in FIG. 3B, and FIG. The figure explaining a mode that the seal packing shown is attached to a duct cover, (b) is a figure explaining a mode that a cell is inserted in the seal packing shown in FIG.3 and FIG.4. In FIG. 1, the case is not shown.

  In the power storage device 1, a plurality of cells 3 are mounted on the duct cover 2, and the whole cell is covered with the case 4, so that the plurality of cells 3 are accommodated in a casing formed by the duct cover 2 and the case 4. . Each cell 3 is a rectangular parallelepiped box-shaped component, and an explosion-proof valve and an electrode (not shown) are provided on the lower surface in FIGS. 1 and 2. Here, four cells 3 are arranged side by side so that the explosion-proof valve side is at the bottom, and are mounted at predetermined positions in the duct cover 2. Reference numeral 5 in FIG. 1 is a face seal for preventing leakage of gas or electrolyte from the explosion-proof valve and discharging it from a discharge port (not shown) provided in the duct cover 2.

  In the present specification, when referring to the upper and lower sides, the upper side in the drawing is “up” and the lower side in the drawing is “lower” with reference to the state shown in the drawing.

  In the duct cover 2, a packing mounting portion 21 having a rectangular shape in plan view is formed in a concave shape so as to surround all of the cells 3 arranged side by side, and the seal packing 6 is mounted in the packing mounting portion 21. ing.

  The seal packing 6 has a plurality of rectangular insertion openings 62 corresponding to the cross-sectional shape of the cell 3 inside the packing body 61 formed in a rectangular frame shape in plan view, similar to the planar shape of the packing mounting portion 21. doing. The seal packing 6 shown in the present embodiment has four insertion ports 62 corresponding to the four cells 3. Between the adjacent insertion ports 62, 62 is a rod-shaped interval holding portion 63 that defines the interval between the adjacent cells 3, 3 to be a predetermined interval in consideration of cooling.

  The packing body 61 and the interval holding part 63 are integrally formed of a rubber-like elastic body. As a rubber-like elastic body, a publicly known material used as a packing material can be used as appropriate. For example, nitrile rubber, styrene butadiene rubber, fluorine rubber, acrylic rubber, silicon rubber, or synthetic rubber (including foamed rubber) containing at least one of them can be used. Among these, a low μ material (low friction material) is preferable from the viewpoint of improving the insertability of the cell 3.

  The inner peripheral surface 62 a of each insertion port 62 has a first lip portion 64 that contacts and seals the outer peripheral surface 3 a of each cell 3. Further, the outer peripheral surface 61 a of the packing body 61 has a second lip portion 65 that seals in contact with the inner peripheral surface 21 a of the packing mounting portion 21 of the duct cover 2. Details of the first lip portion 64 and the second lip portion 65 will be described later.

  The assembly of the power storage device 1 is performed as follows. First, as shown in FIG. 5A, the seal packing 6 is mounted on the packing mounting portion 21 of the duct cover 2 from above the packing mounting portion 21. Next, as shown in FIG. 5B, the explosion-proof valve side becomes the duct cover 2 side from above the insertion ports 62 of the seal packing 6 mounted in the packing mounting portion 21. The cell 3 is mounted in the duct cover 2 by inserting the cell 3 into the duct cover 2.

  As a result, the seal packing 6 seals the space between the outer peripheral surface 3a of each cell 3 and the inner peripheral surface 62a of the insertion port 62 by contacting the first lip portion 64, and at the same time, the first lip portion. Each cell 3 is aligned and positioned in each insertion port 62 by contact with 64. Further, the seal packing 6 seals between the seal mounting portion 21 by the second lip portion 65 being in contact with the inner peripheral surface 21 a of the packing mounting portion 21.

  In the unlikely event, the seal packing 6 is formed by forming a seal portion on the outer peripheral surface 3a of each cell 3 and the inner peripheral surface 21a of the packing mounting portion 21 by the first lip portion 64 and the second lip portion 65, respectively. Even if gas or electrolyte leaks from the seal 5, the seal packing 6 can exhibit a backup function and prevent leakage to the outside of the power storage device 1. Further, even if water or dust penetrates from between the duct cover 2 and the case 4, the seal packing 6 can prevent the cell 3 from entering the explosion-proof valve or the vicinity of the electrodes.

  Thereafter, the case 4 is attached to the duct cover 2, whereby the power storage device 1 in which a plurality of cells 3 are accommodated is obtained.

  As described above, according to the seal structure of the power storage device 1 using the seal packing 6, the cell 3 is simply inserted into the insertion opening 62 of the seal packing 6 mounted on the packing mounting portion 21. Thus, the mounting operation of each cell 3 is completed, so that the mounting operation of the cell 3 can be performed very easily.

  In addition, the seal packing 6 regulates the space between the adjacent cells 3 and 3 by the interval holding unit 63 so as to be a constant interval in consideration of cooling, and at the same time, each cell 3 is inserted by the first lip portion 64. Since positioning is performed in 62, the alignment and positioning functions of the cell 3 can be achieved. Therefore, with only one component of the seal packing 6, it is possible to perform the interval maintenance, alignment, and positioning of the cells 3 together with the sealing function, and the number of components of the power storage device 1 can be greatly reduced.

  Next, details of the structure of the seal packing 6 will be described with reference to FIGS.

  The seal packing 6 is provided with three rod-shaped gap holding portions 63 on two inner sides of the packing body 61 facing each other inside a frame-shaped packing body 61 having a rectangular shape in plan view. Thereby, the insertion openings 62 of the four cells 3 are formed between the packing main body 61 and the interval holding portion 63 and between the interval holding portions 63 and 63.

  On the lower surface of the seal packing 6 (packing main body 61 and interval holding portion 63), an engagement groove 66 that engages with an engagement protrusion 21b provided on the packing mounting portion 21 of the duct cover 2 is formed. The engagement groove 66 engages with the engagement protrusion 21 b of the packing mounting portion 21, whereby the seal packing 6 can be fixed at a predetermined position in the packing mounting portion 21.

  The first lip portion 64 protrudes inward and downward of the insertion port 62 from the middle in the height direction of the inner peripheral surface 62a of each insertion port 62, and is inclined downward along the insertion direction of the cell 3. Are integrally formed. The first lip portion 64 is formed over the entire circumference of the inner peripheral surface 62a of the insertion port 62 while maintaining a constant inclination angle.

  Therefore, according to this seal packing 6, as shown in FIG. 5 (b), the cell 3 is inserted into each insertion port 62, and the interval between the adjacent cells 3 and 3 is set by the interval holding unit 63. It can be defined to be a constant interval. Moreover, by only inserting the cell 3 into the insertion port 62, the first lip portion 64 can perform a sealing function with the cell 3, and at the same time, the cell 3 can be aligned and positioned. For this reason, the mounting operation of the cell 3 can be performed very easily.

  Since the first lip portion 64 is formed in a downwardly inclined shape along the insertion direction of the cell 3, the function of guiding the cell 3 to the inside of the first lip portion 64 when the cell 3 is inserted. And the insertion resistance can be reduced. Therefore, the insertion workability of the cell 3 can be improved.

  The first lip portion 64 is formed so that the longitudinal width and the lateral width of the inner peripheral edge are both slightly smaller than the longitudinal width and the lateral width of the cell 3. Is done. However, even if gas or electrolyte leaks from the cell 3, almost no pressure is applied to the seal packing 6. Therefore, by making the width of the inner peripheral edge of the first lip portion 64 equal to the width of the cell 3, The fastening margin of the first lip portion 64 can be substantially zero. Thereby, the insertion resistance of the cell 3 can be further reduced while ensuring the sealing function, and the insertion workability of the cell 3 can be further improved.

  Further, since the first lip portion 64 has a lip shape that protrudes inwardly and downwardly downwardly, the entire first lip portion 64 is easily bent in the radial direction of the insertion port 62. be able to. For this reason, there is no possibility of increasing the insertion resistance even if a certain allowance is formed. Therefore, the sealing function can be improved by the elasticity exhibited by the first lip portion 64 itself without increasing the insertion resistance.

  The second lip portion 65 projects from the middle of the outer peripheral surface 61a of the packing body 61 outward and upward of the packing body 61, and so as to incline upward along the direction opposite to the insertion direction of the cells 3. Is formed. The second lip portion 65 is formed over the entire circumference of the outer peripheral surface 61 a of the packing body 61 while maintaining a constant inclination angle, and is slightly tightened against the inner peripheral surface 21 a of the packing mounting portion 21 of the duct cover 2. Forming a teenager.

  Since the second lip portion 65 is formed in an upwardly inclined manner as described above, the seal packing 6 is mounted on the packing mounting portion 21 of the duct cover 2 from above as shown in FIG. The insertion resistance can be reduced, and the second lip portion 65 can be easily bent and deformed inward, so that the mounting operation can be performed satisfactorily.

  Further, when the seal packing 6 is mounted on the packing mounting portion 21 of the duct cover 2, the seal packing 6 is stable and favorable with respect to the inner peripheral surface 21 a of the packing mounting portion 21 due to the elasticity exhibited by the second lip portion 65 itself. A sealed state can be formed.

  As shown in FIG. 4, the gap holding portion 63 of the seal packing 6 is preferably formed so that the height (thickness) is higher (thicker) than the packing body 61. Thereby, since the rigidity of the space | interval holding | maintenance part 63 can be improved, the space | interval holding | maintenance part 63 becomes difficult to twist, and the alignment and positioning of the cell 3 can be performed more favorably.

  Further, the seal packing 6 is reliably positioned at a predetermined position in the packing mounting portion 21 by engaging the engaging groove 66 with the engaging protrusion 21 b of the packing mounting portion 21. Thereby, since alignment and positioning of each cell 3 can be performed more reliably, it is a preferable aspect in this invention.

  In the above description, a rectangular parallelepiped cell is illustrated, but in the present invention, the cell is not limited to such a rectangular parallelepiped shape, and may have various external shapes. Accordingly, it is needless to say that the opening shape of the insertion opening 62 of the seal packing 6 corresponds to various outer shapes of the cell.

  In the present invention, the cell of the power storage device 1 may be a battery cell or a capacitor cell. Thereby, the electrical storage apparatus 1 comprises a battery or a capacitor. As the battery, a secondary battery such as a lithium ion battery can be considered.

  The sealing structure of the power storage device according to the present invention has the same effect as described above by sealing the battery cell or the capacitor cell with the seal packing 6.

DESCRIPTION OF SYMBOLS 1: Power storage device 2: Duct cover 21: Packing mounting part 21a: Inner peripheral surface 21b: Engagement protrusion 3: Cell 3a: Outer peripheral surface 4: Case 5: Surface seal 6: Seal packing 61: Packing main body 61a: Outer peripheral surface 62 : Insert port 62a: Inner peripheral surface 63: Space holding part 64: First lip part 65: Second lip part 66: Engagement groove

Claims (4)

A plurality of cells are juxtaposed in a housing made up of a cover and a case, and a packing mounting portion is provided on the cover, and a space between the plurality of cells is sealed by a seal packing mounted in the packing mounting portion. A sealing structure of the device,
The seal packing is
A packing body mounted in the packing mounting portion;
A plurality of insertion openings provided in the packing main body and into which the cells are respectively inserted;
A first lip provided on the inner peripheral surface of each of the insertion ports so as to be inclined along the insertion direction of the cells;
A second lip portion provided on the outer peripheral surface of the packing body so as to be inclined along a direction opposite to the insertion direction of the cells;
By mounting the seal packing in the packing mounting portion, the second lip portion is in contact with the inner peripheral surface of the packing mounting portion and sealed,
When the cells are respectively inserted into the insertion openings, the first lip portion is in contact with the outer peripheral surface of the cell and seals between the outer peripheral surfaces, and the cell is positioned. The seal structure of the electrical storage device. The seal packing has an interval holding part that regulates a space between adjacent cells between the adjacent insertion ports,
The power storage device seal structure according to claim 1, wherein the gap holding portion is formed to have a height higher than that of the packing body.   3. An engagement projection is provided on the packing mounting portion, and an engagement groove for engaging with the engagement projection is formed on the lower surface of the seal packing. The power storage device seal structure.   The power storage device seal structure according to claim 1, wherein the cell is a battery cell or a capacitor cell.

Images