JP2008085168A - Storage battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a storage battery capable of radiating heat through the bottom surface thereof without impairing insulating properties. <P>SOLUTION: This storage battery 1 comprises: a plurality of capacitor cells 11 which are laminated; a frame body 4 comprising a pair of end face plates 2 and a pair of side face plates 3 which are formed of materials having high thermal conductivity and high rigidity in which the capacitor cells 11 are compressed in the laminating direction and held by the end face plates 2; a bottom plate 17 formed of a material having high thermal conductivity and high rigidity and occluding the bottom of the frame body 4; a plurality of heat transferring plates 12 each having a contact part 20 formed of a material having high thermal conductivity, sandwiched among a plurality of capacitors 11, protruding out of the capacitor cells 11 and abutting to the side face plates 3 at both sides and to the bottom plate 17; a separating member 18 formed of a material having high thermal conductivity and insulating properties, and covering the bottom surface of the bottom plate 17; a fixing member 6 formed of a material having insulating properties and high rigidity, and holding the frame body and the bottom plate; and a corrosion-resistant film 10 formed of a corrosion-resistant material and covering the bottom surface of the separating member 18. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a power storage device, and more particularly to an electric double layer capacitor having a plurality of capacitor cells.

  A power storage device (electric double layer capacitor) in which a plurality of capacitor cells are built in a container is known. Such a power storage device deteriorates in performance due to heat generated by the capacitor cell. Therefore, as described in Patent Document 1 and Patent Document 2, a heat transfer plate made of aluminum or the like having a high thermal conductivity is sandwiched between the capacitor cells, and the heat is transferred to a heat dissipation plate arranged on the side of the capacitor cell. In some cases, the end of the hot plate is connected to dissipate heat by moving the heat.

  A metal such as aluminum not only has a high thermal conductivity, but also has a high mechanical strength. Therefore, it is also used as a material constituting a frame body that accommodates the capacitor cell. For this reason, the function as a heat sink can be strengthened by providing a heat radiating fin and a refrigerant flow path in the frame that houses the capacitor cell.

  Further, in the power storage device, it is necessary to electrically isolate a metal part that is not electrically insulated from the capacitor cell from the installation surface in order to prevent leakage. For this reason, the metal part for heat dissipation for cooling a capacitor cell could not be arrange | positioned on the bottom face of an electrical storage apparatus. Further, since it is necessary to provide a fixing structure such as an anchor hole for fixing the power storage device on the bottom plate of the power storage device, a material such as an insulating and high-rigidity phenol resin (bakelite) or crystalline plastic is used. It is used.

Thermally conductive rubber has been developed as a highly heat conductive and insulating material, but it has poor mechanical strength and corrosion resistance and cannot be used as a structural member on the bottom surface of the power storage device for fixing the power storage device. In other words, it has both rigidity that can support the mass of the power storage device and fix it to the installation surface, insulation that can electrically isolate the device from the installation surface, and high thermal conductivity that can efficiently release the heat of the capacitor cell. The material cannot be found in an economical range at present.
JP 2003-133188 A Japanese Patent Laid-Open No. 2005-57007

  As described above, in the conventional power storage device, the heat of the capacitor cell cannot be released from the bottom surface.

  Therefore, an object of the present invention is to provide a power storage device that can dissipate heat from the bottom without impairing the insulating properties.

  In order to solve the above-described problems, a power storage device according to the present invention includes a plurality of capacitors sealed by accommodating a laminate including a certain number of positive and negative electrode bodies and a separator interposed therebetween together with an electrolytic solution. A frame comprising a cell and a pair of end plates and a pair of side plates formed of a material having high thermal conductivity and high rigidity, and the capacitor cells are compressed and held in the stacking direction of the multilayer body by the end plates. A body, a bottom plate that closes the bottom of the frame body, and a high thermal conductivity material that is sandwiched between the plurality of capacitor cells. A plurality of heat transfer plates having contact portions that protrude and protrude to contact with the side plates and the bottom plates on both sides, a separation member that is formed of a highly heat conductive and insulating material and covers the bottom surface of the bottom plate; Sex and formed of a high rigid material, and having a fixing member for holding the frame or the bottom plate.

  According to this structure, since the fixing member receives the regulating force for fixing the power storage device to the installation surface, a large mechanical load is not applied to the separation member, and the separation member is highly thermally conductive and insulating with low mechanical strength. It is possible to form with the material of. Thereby, the heat of the capacitor cell can be released from the heat transfer plate to the installation surface via the bottom plate and the separation member.

  In the power storage device of the present invention, each of the contact portions may be divided into a plurality of contact pieces that are provided with slits and have spring properties.

  According to this structure, each contact piece acts as an independent spring, and each contact piece comes into contact with the side plate and the bottom plate, respectively. Thereby, the contact area to the side plate and bottom plate of a contact part as a whole can be increased, and the heat dissipation effect can be improved.

  In addition, the power storage device of the present invention may include a corrosion-resistant film that is made of a corrosion-resistant material and covers the bottom surface of the separation member.

  According to this structure, it is possible to prevent the liquid overflowing on the floor surface on which the power storage device is installed from coming into contact with the separation member and degrading the separation member by providing the thin corrosion-resistant film to such an extent that the heat conduction is not hindered.

  In the power storage device of the present invention, the end face plate, the side face plate, the bottom plate, and the heat transfer plate can be formed of metal, and the separation member can be formed of heat conductive rubber, and the holding member The member can be formed of an insulating plastic.

  According to the present invention, since the fixing member receives the regulating force to fix the power storage device to the installation surface, it is possible to provide a separation member that ensures insulation while releasing the heat of the capacitor cell to the bottom surface. .

Embodiments of the present invention will now be described with reference to the drawings.
In FIG. 1, the external appearance of the electrical storage apparatus 1 of 1st Embodiment of this invention is shown. The power storage device 1 includes a frame body 4 made of a pair of end face plates 2 and a pair of side face plates 3 made of aluminum, and a cover 5 made of aluminum and closing the upper portion of the frame body 4. A fixing member 6 made of phenol resin is screwed to the lower outer end of each end face plate 2, and a handle 7 made of phenol resin is attached to the upper outside of the end face plate 2. In the power storage device 1, two power terminals 8 and a control terminal 9 are led out from the inside of the frame body 4.

  As shown in FIG. 2, the bottom surface between the fixing members 6 of the power storage device 1 is covered with a corrosion-resistant sheet 10 made of, for example, polyethylene terephthalate.

  Further, FIG. 3 shows an internal configuration of the power storage device 1. The power storage device 1 includes a capacitor cell 11 packaged with an insulating film in a state where an electrode plate and a separator are immersed in an electrolytic solution, and a heat transfer plate 12 made of aluminum, which are alternately stacked in a frame 4. Contained. The electrodes of adjacent capacitor cells 11 are connected to each other by crimping at caulking terminals 13, and all the capacitor cells 11 are connected in series.

  Between the laminated capacitor cell 11 and the end face plate 2 on one side, a pressure plate 14 that is in contact with substantially the entire surface of the capacitor cell 11 is disposed, and the capacitor cell 11 and the heat transfer plate 12 are mutually connected by a compression spring 15. It presses so that it may press-contact each other. That is, the frame body 4 has the end plate 2 and the side plate made of high-rigidity aluminum so as to have sufficient mechanical strength to compress and hold the capacitor cell 11 in the stacking direction by the urging force of the compression spring 15. It is constructed by screwing firmly.

  In addition, the capacitor cell 11 is connected to a circuit board 16 having a control circuit so that voltage variation between the capacitor cells 11 can be adjusted.

  The bottom of the frame body 4 is closed by a bottom plate 17 made of aluminum, and is fixed to the fixing member 6 together with the bottom plate 17. The bottom surfaces of the bottom plate 17 and a part of the fixing member 6 are covered with a separation member 18 made of a silicon rubber sheet, and the corrosion-resistant sheet 6 covers the bottom surface of the separation member 18. The separation member 18 and the corrosion-resistant sheet 6 are sandwiched and held between the rising portion of the side portion of the bottom plate 17 by a pressing plate 19 made of phenol resin.

  FIG. 4 shows the shape of the heat transfer plate 12. The heat transfer plate 12 has contact portions 20 that extend to both sides and the lower side and are bent at a right angle. Each contact portion 20 is divided into a plurality of contact pieces 21 each having a slit.

  Although the heat transfer plate 12 is sandwiched between the capacitor cells 11, the contact portion 20 protrudes from the capacitor cell 11 and abuts on the side plate 3 or the bottom plate 17 on both sides. At this time, each of the contact pieces 21 acts as a spring that exhibits elasticity independently and abuts against the side plate 3 or the bottom plate 17, so that it absorbs a dimensional error and an assembly error of each component and has a wide contact area. Can be secured.

  Since the aluminum forming the heat transfer plate 12 is a material having a high thermal conductivity, the heat transfer plate 12 can derive the heat of the capacitor cell 11 and efficiently transfer it to the side plate 3 and the bottom plate 17. The side plate 3 is made of aluminum having high thermal conductivity, and further, fins that increase the contact area with the surrounding air are formed on the outside, so that the heat transferred from the heat transfer plate 12 is transferred to the surroundings. Release into the air.

  FIG. 5 shows the detailed shape of the fixing member 6. The fixing member 6 includes an anchor hole 22 for fixing the power storage device 1 to an installation surface such as a floor surface or a base surface, a counterbore 23 for receiving a screw for connecting the bottom plate 17 and the end surface plate 2, and a screw for fixing the bottom plate 17 to the screw. And a screw hole 24 for fixing with a screw.

  6 and 7 show a state where the power storage device 1 is disconnected. As shown in FIG. 6, rising portions on both sides of the bottom plate 17 are fixed to the lower end of the side plate 3 with screws, and the cover 3 is screwed to the upper end of the side plate 3.

  As shown in FIG. 7, the bottom plate 17 is provided with steps at both ends, extends to the upper surface of the fixing member 6, and is fixed with screws. Since the fixing member 6 is formed of a phenol resin that is an insulating and highly rigid insulating plastic, the fixing member 6 supports the entire power storage device 1 and does not allow the bottom plate 17 to be in electrical and mechanical contact with the installation surface.

  The bottom surface of the central portion of the bottom plate 17 that is not supported by the fixing member 6 is covered with a separation member 18 made of insulating silicon rubber and a corrosion-resistant sheet 10 made of corrosion-resistant polyethylene, for example, polyethylene terephthalate. The separation member 18 and the corrosion-resistant sheet 10 are bent and stretched along the rising edge of the side of the bottom plate 17, and preferably the bottom plate 17 is covered with the pressing plate 19 on the side of the power storage device 1. The bottom surface and the lower end portion of the side plate 3 are fixed so as to cover both. For this reason, when the liquid overflows on the installation surface of the power storage device 1, the bottom plate 17 and preferably the bottom plate 17 and the side plate 3 are moved to an appropriate height so that the bottom plate 17 and the side plate 3 do not come into contact with the liquid. The insulation of the power storage device 1 is ensured by covering. Further, even when a liquid that erodes the separation member 18 such as an organic solvent enters the installation surface of the power storage device 1, the separation member 18 is covered to a suitable height so that the separation member 18 does not come into contact with the liquid. Corrosion resistance is ensured.

  That is, the power storage device 1 is electrically reliably insulated from the installation surface by the insulating fixing member 6 and the separating member 18.

  The silicon rubber forming the separating member 18 is a heat conductive rubber having an insulating property and a high heat conductivity. In general, a highly heat-conductive and insulating material such as a heat-conductive rubber is likely to be chemically deteriorated and has poor oil resistance. For this reason, by covering the storage device 1 with the corrosion-resistant sheet 10, even if the installation surface overflows with machine oil or liquid such as water or solvent, the separation member 18 is prevented from coming into contact with the liquid and being deteriorated. ing.

  The fixing member 6 is made of an insulating and highly rigid phenol resin, and the lower surfaces of both ends protrude downward by the thickness of the separation member 18 and the corrosion-resistant sheet 10. In other words, the bottom plate 17 and the portion of the bottom plate covered by the separation member 18 are recessed by the thickness of the separation member 18 and the corrosion-resistant sheet 10.

  As a result, the fixing member 6 mainly receives the force of a screw or a metal fitting that regulates the position of the power storage device 1. Since the separation member 18 has a certain degree of elasticity, the separation member 18 widely contacts the installation surface with a low pressure via the corrosion-resistant sheet 10 to receive the mass of the power storage device.

  As a result, the heat transferred from the capacitor cell 11 to the high thermal conductivity bottom plate 17 via the high thermal conductivity heat transfer plate 12 passes through the high thermal conductivity separation member 18 and the corrosion-resistant sheet 10 to thereby store the power storage device 1. The heat is dissipated in a reliable contact with the installation surface such as the floor or base on which is installed.

  In addition, since the corrosion-resistant sheet | seat 10 becomes heat resistance, the thin thing which does not inhibit heat transfer as much as possible is used.

  Further, the heat transmitted to the bottom plate 17 and the side plate 3 can be conducted to the end plate 2 and also to the cover 5, and is efficiently radiated to the outside of the power storage device 1.

The perspective view of the electrical storage apparatus of one Embodiment of this invention. The perspective view from the downward direction of the electrical storage apparatus of FIG. The disassembled perspective view of the electrical storage apparatus of FIG. The perspective view of the heat exchanger plate of the electrical storage apparatus of FIG. The perspective view of the fixing member of the electrical storage apparatus of FIG. FIG. 2 is a partial cross-sectional perspective view of the power storage device of FIG. 1. FIG. 2 is a partial cross-sectional perspective view of the power storage device of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power storage device 2 End face plate 3 Side face plate 4 Frame body 6 Fixing member 10 Corrosion-resistant sheet 11 Capacitor cell 12 Heat transfer plate 17 Bottom plate 18 Separation member 20 Contact part 21 Contact piece

In order to solve the above-described problems, a power storage device according to the present invention includes a plurality of capacitors that are sealed by accommodating a laminate including a certain number of positive and negative electrode bodies and a separator interposed therebetween together with an electrolyte. A frame comprising a cell and a pair of end plates and a pair of side plates formed of a material having high thermal conductivity and high rigidity, and the capacitor cells are compressed and held in the stacking direction of the multilayer body by the end plates. A body, a bottom plate that closes the bottom of the frame body, and a high thermal conductivity material that is sandwiched between the plurality of capacitor cells. a plurality of heat transfer plate having a contact portion which respectively abut on the side plate and the bottom plate on both sides protrude, are formed by high thermal conductivity and insulating material, not covered with the bottom surface of the bottom plate, contact the installation surface That the separating member is formed insulating and a high rigid material, have a fixing member for holding the frame or the bottom plate, the fixing member has an upper surface of the fixing member the frame member or the bottom member A holding structure for holding the fixing plate on the installation surface without electrically and mechanically contacting the bottom plate with the installation surface, and the separation on the lower surface of the fixing member In order to receive the member, it is provided with a receiving structure that is recessed substantially by the thickness of the separating member .

According to this structure, since the fixing member receives the regulating force for fixing the power storage device to the installation surface, a large mechanical load is not applied to the separation member, and the separation member is highly thermally conductive and insulating with low mechanical strength. It is possible to form with the material of. Furthermore, by providing a receiving structure that is recessed by the thickness of the separation member on the lower surface of the fixing member, the separation member can be widely brought into contact with the installation surface with a low pressure. Thereby, the heat of the capacitor cell can be released from the heat transfer plate to the installation surface via the bottom plate and the separation member.

In the power storage device of the present invention, the separation member may be bent along the side portion of the bottom plate and extended upward, and the extended portion may be held by a pressing plate.

According to this structure, even when the liquid overflows on the installation surface of the power storage device, the bottom plate is covered with the separating member to an appropriate height so that the bottom plate does not come into contact with the liquid.

In the power storage device of the present invention, the bottom plate may be bent upward at the side to form a rising edge, and the pressing plate may be screwed to the rising edge.

In addition, the power storage device of the present invention may include a corrosion-resistant film that is made of a corrosion-resistant material and covers the bottom surface of the separation member.

According to this structure, it is possible to prevent the liquid overflowing on the floor surface on which the power storage device is installed from coming into contact with the separation member and deteriorating the separation member by providing the thin corrosion-resistant film so as not to inhibit the heat conduction.

FIG. 5 shows the detailed shape of the fixing member 6. The fixing member 6 includes an anchor hole (fixing structure) 22 for fixing the power storage device 1 to an installation surface such as a floor surface or a base surface, a counterbore 23 that receives a screw that connects the bottom plate 17 and the end surface plate 2, A screw hole (holding structure) 24 for fixing the bottom plate 17 with a screw is formed.

The fixing member 6 is made of an insulating and highly rigid phenol resin, and the lower surfaces of both ends protrude downward by the thickness of the separation member 18 and the corrosion-resistant sheet 10. In other words, the bottom plate 17 and the portion of the bottom plate covered by the separation member 18 are recessed by the thickness of the separation member 18 and the corrosion-resistant sheet 10 (receiving structure) .

In order to solve the above-described problems, a power storage device according to the present invention includes a plurality of capacitors that are sealed by accommodating a laminate including a certain number of positive and negative electrode bodies and a separator interposed therebetween together with an electrolyte. A frame comprising a cell and a pair of end plates and a pair of side plates formed of a material having high thermal conductivity and high rigidity, and the capacitor cells are compressed and held in the stacking direction of the multilayer body by the end plates. A body, a bottom plate that closes the bottom of the frame body, and a high thermal conductivity material that is sandwiched between the plurality of capacitor cells. A plurality of heat transfer plates that protrude and protrude from both sides of the side plate and the bottom plate, and are made of a highly heat-conductive and insulating material, cover the bottom surface of the bottom plate, and contact the installation surface And a fixing member that is formed of an insulating and high-rigidity material and holds the frame body or the bottom plate, and the fixing member includes the frame body or the bottom body on an upper surface of the fixing member. A holding structure for holding the fixing plate on the installation surface without electrically and mechanically contacting the bottom plate with the installation surface, and the separation on the lower surface of the fixing member A receiving structure that is substantially recessed by the thickness of the separating member to receive the member, the bottom plate is bent upward to form a rise, and the separating member extends along the side of the bottom plate. It is assumed that the bent portion is bent and extended upward, and the extended portion is held by a holding plate screwed to the rising of the bottom plate .

In the power storage device of the present invention, the separation member is bent along the side portion of the bottom plate and extends upward, and the upward extension portion is held by a pressing plate .

In the power storage device of the present invention, the bottom plate is bent upward at the side to form a rising edge, and the pressing plate is screwed to the rising edge .

Claims (4)

A plurality of capacitor cells sealed by accommodating a laminate composed of a constant number of positive and negative electrode bodies and a separator interposed therebetween together with an electrolyte;
A frame comprising a pair of end plates and a pair of side plates formed of a material having high thermal conductivity and high rigidity, and compressing and holding the capacitor cells in the stacking direction of the laminate by the end plates;
A bottom plate that is formed of a material having high thermal conductivity and high rigidity, and closes the bottom of the frame;
A plurality of heat transfer plates formed of a material having high thermal conductivity, sandwiched between the plurality of capacitor cells, and having contact portions protruding from the capacitor cells and contacting the side plates and the bottom plates on both sides;
A separation member formed of a material having high thermal conductivity and insulation, and covering the bottom surface of the bottom plate;
A power storage device, comprising: a fixing member that is formed of an insulating and high-rigidity material and holds the frame or the bottom plate.   2. The power storage device according to claim 1, wherein each of the contact portions is divided into a plurality of contact pieces having a spring property and provided with a slit.   The power storage device according to claim 1, further comprising a corrosion-resistant film made of a corrosion-resistant material and covering a bottom surface of the separation member. The end face plate, the side plate, the bottom plate and the heat transfer plate are made of metal,
The separation member is formed of a heat conductive rubber,
The power storage device according to claim 1, wherein the holding member is made of an insulating plastic.

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