JP5442978B2 - Heat dissipation component - Google Patents

Description

  The present invention relates to a heat dissipation component and a secondary battery.

  Secondary batteries are attracting attention not only as a power source for portable devices but also as a backup for various power sources. In such a backup application, since it is necessary to supply power exceeding the power consumption of the portable device for a long time, a secondary battery having a large energy density is used as a secondary battery for the backup application.

  One of the secondary batteries with high energy density is a lithium ion secondary battery. In the lithium ion secondary battery, lithium oxide is used as a positive electrode, carbon is used as a negative electrode, EC (ethylene carbonate) and DMC (dimethyl carbonate) are used as an electrolyte. ) And other electrode materials and electrolytes are flammable. If the temperature inside the secondary battery rises for some reason, these electrode materials and electrolytes The liquid may ignite.

Therefore, as described in Patent Document 1 below, in order to prevent the temperature of the secondary battery from rising, a flat plate heat pipe is provided on the side surface of the single battery in the assembled battery in which a plurality of single batteries are connected. Some have proposed to arrange.
JP 2002-373708 A

  However, in the conventional technique, the surface of the secondary battery is only cooled, and the heat inside the secondary battery cannot be effectively radiated.

  The present invention has been made in view of the above problems, and one of the objects of the present invention is to provide a heat dissipation component and a secondary battery that can effectively dissipate the heat inside the secondary battery to the outside. There is to do.

  In order to achieve the above object, a heat dissipation component according to the present invention includes a container containing an electrode sheet, an electrolytic solution, and a current collector that has thermal conductivity and is connected to the electrode sheet; A heat dissipating component used in a secondary battery including at least one surface and an electrode connected to the current collector, wherein the heat dissipating component is fixed to the electrode.

  In one aspect of the present invention, the heat dissipation component is a mechanical element used when fixing a connection component that connects the electrode to another electrode.

  In one embodiment of the present invention, the electrode is a pole column, the heat dissipation component is a washer provided between the connection component and a nut, and the washer includes a hole through which the pole column passes, A fixing portion provided on the outer periphery of the hole to be in contact with and fixed to the nut, and a radiating fin provided on the outer periphery of the fixing portion.

  In one embodiment of the present invention, the electrode is a pole column, the heat dissipation component is a nut that fixes the connection component to the pole column, and the nut includes a hole through which the pole column passes, And a heat dissipating fin provided on the outer periphery of the hole.

  In one embodiment of the present invention, at least the surface of the heat dissipation component is an insulator.

  In one embodiment of the present invention, the heat dissipation component is a connection component that connects the electrode to an electrode of another secondary battery.

  In one embodiment of the present invention, the electrode is a pole column, and the connection component includes a hole through which the pole column penetrates and a radiation fin.

  In addition, a secondary battery according to one embodiment of the present invention includes a container containing an electrode sheet, an electrolytic solution, and a current collector that has thermal conductivity and is connected to the electrode sheet, and at least one surface of the container And an electrode connected to the current collector, and a heat dissipating component fixed to the electrode.

  According to one aspect of the present invention, heat inside a secondary battery container is transferred to an electrode, and heat is radiated to the outside of the secondary battery by a heat radiating component provided on the electrode, thereby effecting the heat inside the secondary battery. Heat can be released.

  According to one aspect of the present invention, it is possible to effectively dissipate the secondary battery while fixing the connection component to the electrode.

  According to one aspect of the present invention, the secondary battery can be effectively dissipated by the washer used when fixing the connection component to the electrode.

  According to an aspect of the present invention, the secondary battery can be effectively dissipated by the nut used when fixing the connection component to the electrode.

  According to one embodiment of the present invention, since the surface of the heat dissipation component is insulated, the risk of a short circuit due to contact with the outside can be reduced.

  According to one embodiment of the present invention, a connection component that connects electrodes to each other can be provided as a heat dissipation component, and heat inside the secondary battery can be effectively dissipated.

  According to one aspect of the present invention, heat dissipation by the connecting component can be performed more effectively.

  According to one embodiment of the present invention, the heat inside the secondary battery can be effectively radiated by radiating heat from the electrode to which the heat inside the container of the secondary battery is transmitted.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments (hereinafter referred to as embodiments) for carrying out the invention will be described with reference to the drawings.

  In FIG. 1, the block diagram of the secondary battery 10 (unit cell) which concerns on this embodiment is shown. As shown in FIG. 1, the secondary battery 10 includes a battery container 20 that houses an electrode sheet and an electrolyte solution, and electrodes 30 (a positive electrode 30 </ b> A and a negative electrode 30 </ b> B) provided on an upper cover 20 </ b> A of the battery container 20.

  The battery container 20 has a rectangular parallelepiped shape, and a rectangular parallelepiped accommodation space is also provided inside. The battery container 20 may be made of a resin such as ABS (Acrylonitrile Butyrene) or PP (Polypropylene), or may be made of stainless steel, aluminum, or the like. In the battery container 20, an electrode 30 is provided on an upper lid 20A facing the installation surface, and the electrode 30 may be configured by a bolt-shaped pole column that penetrates the upper lid 20A. In the accommodation space of the battery container 20, an electrode group 40 made of a positive electrode sheet, a negative electrode sheet, a separator, and the like, an electrolytic solution, a current collector (a positive electrode current collector 50A, a negative electrode current collector 50B), and the like are accommodated.

  The positive electrode sheet is configured by applying a positive electrode active material to an aluminum foil. For example, the positive electrode sheet may be obtained by applying a mixture containing a positive electrode active material, a conductive material, and a binder onto an aluminum thin film current collector having a thickness of 10 μm. Examples of positive electrode active materials include lithium composite oxides containing at least one transition metal such as V, Mn, Fe, Co, and Ni, which are materials capable of doping and undoping lithium ions, and lithium based on a spinel structure. A manganese spinel composite oxide may be used. The positive electrode active material may be formed with a thickness of about 20 μm on both sides of the aluminum thin film current collector.

  The negative electrode sheet is configured by applying a negative electrode active material to copper foil. For example, for the negative electrode sheet, natural graphite is made into a paste by adding a binder such as polyvinylidene fluoride (PVDF) and a solvent (N-methylpyrrolidone), and this is formed on a copper thin film current collector having a thickness of 10 μm. It is good to use what apply | coated to thickness of about 20 micrometers on both surfaces.

  The positive electrode sheet and the negative electrode sheet are wound in a state in which a separator is disposed between the positive electrode sheet and the negative electrode sheet so that they are not short-circuited to constitute the electrode group 40. The electrode group 40 is configured by winding four layers of a positive electrode sheet, a separator, a negative electrode sheet, and a separator. As the separator, a porous sheet made of a material such as polyethylene, polypropylene, or fluorine resin may be used.

  The current collector includes a positive electrode current collector 50A connected to the positive electrode sheet of the electrode group 40 and a negative electrode current collector 50B connected to the negative electrode sheet, and a material having thermal conductivity is used for the current collector. . For example, aluminum may be used for the positive electrode current collector 50A, and copper may be used for the negative electrode current collector 50B, for example. Each of these current collectors may be formed in the form of a sheet or a bar.

  The upper lid 20A of the battery container 20 is provided with a positive pole 30A as a positive terminal and a negative pole 30B as a negative terminal. Each of the poles penetrates the upper lid 20A and is a positive pole 30A. Is connected to the positive electrode current collector 50A, and one end of the negative electrode pole 30B is connected to the negative electrode current collector 50B. The positive pole 30A and the negative pole 30B may be made of a stainless material.

  In a state where the electrode group 40 and the current collectors 50 </ b> A and 50 </ b> B are accommodated in the battery container 20, an electrolytic solution is injected into the battery container 20. As the electrolytic solution, a solution obtained by adding LiPF6 to an organic solvent obtained by mixing propylene carbonate and ethylene carbonate may be used. Then, the upper lid 20A is closed and the battery container 20 is sealed.

  In the present embodiment, heat inside the secondary battery 10 is effectively radiated by attaching a heat dissipation component to the electrode 30 (polar column) of the secondary battery 10. Hereinafter, specific embodiments of the heat dissipation component will be described. First, 1st Embodiment is the example which comprised the washer used when fixing the connection board which connects the electrodes of the secondary battery 10 as a thermal radiation component.

  FIG. 2A shows a configuration example of a washer 100 according to an embodiment of the present invention. (A) of FIG. 2A is a figure from the upper surface of the washer 100, (b) is sectional drawing in XX. As shown in FIG. 2A, the washer 100 includes a hole 102 that penetrates the pole column 30, a fixing part 104 provided on the outer periphery of the hole 102, and a heat radiation fin 106 provided on the outer periphery of the fixing part 104. Composed.

  As shown in FIG. 2B, the washer 100 is disposed between the nut 110 and the connection plate 120, the fixing part 104 is a part in contact with the nut 110, and the diameter of the fixing part 104 depends on the diameter of the nut 110. It may be determined. The radiating fin 106 is configured to include a plurality of wings so that the contact surface with the air is large. However, the shape of the radiating fin 106 is not limited to that illustrated, but may be of other forms. May be.

  The washer 100 may be made of a material having high thermal conductivity, such as aluminum, and may be coated with an epoxy material on the surface thereof to provide insulation. By coating the surface with an insulating coating, the risk of a short circuit due to contact with the outside can be reduced when an assembled battery is configured.

  FIG. 2C shows an example of an assembled battery 400 connected using the washer 100 according to the present embodiment. The assembled battery 400 is configured by connecting a plurality of unit cells 10, and the positive electrode of one unit cell 10 and the negative electrode of another unit cell 10 are connected by a connection plate 120, and the above-described washer is connected to the connection point of the positive electrode. 100 is used. In the example shown in FIG. 2C, the washer 100 is used only at the fixed portion of the positive electrode. However, the washer 100 may be provided at both the positive electrode and the negative electrode, or the washer 100 may be provided only at the negative electrode.

  Next, a second embodiment of the heat dissipation component will be described. In FIG. 3A, the structural example of the nut 200 which is 2nd Embodiment of a thermal radiation component was shown. 3A (a) shows a view of the nut 200 as viewed from above, and FIG. 3A (b) shows a cross-sectional view of the nut 200 at YY. As shown in FIG. 3A, the nut 200 has a hole 202 in the center that is adapted to the diameter of the pole pole, and a female screw 202 </ b> A is cut into the hole 202. The nut 200 is attached to the pole pole by inserting and rotating the tip end portion 212 of the nut fixing tool 210 shown in FIG. Radiating fins 206 are provided on the outer periphery of the hole 202 of the nut 200.

  The nut 200 may be formed, for example, by subjecting a main body made of copper as a material to nickel plating. The nut 200 absorbs heat from the pole column to which the heat inside the secondary battery 10 is transmitted, and further releases heat to the outside of the secondary battery 10 by the heat radiation fin 206.

  Next, a third embodiment of the heat dissipation component will be described. In the heat dissipation component according to the third embodiment, a heat dissipation mechanism is provided on a connection plate that connects the cells.

  FIG. 4A shows a configuration example of the connection plate 300 that is a heat dissipation component according to the third embodiment. As shown in FIG. 4A, the connection plate 300 includes a hole 302 for fixing the pole column and a radiation fin 304. The hole 302 may be sized according to the diameter of the pole column, and the heat radiating fin 304 may be provided at the center of the connection plate 300.

  The connection plate 300 may be formed, for example, by subjecting a main body made of copper as a material to nickel plating. The connection plate 300 is formed using a conductive material, but the heat dissipating fins 304 may be formed using a non-conductive material as long as the material has high thermal conductivity.

  FIG. 4B shows an example of an assembled battery 500 in which the unit cells 10 are connected by the connection plate 300 described above. As shown in FIG. 4B, each battery cell 10 is connected in series to form an assembled battery 500, and a connection plate in which heat transferred from the inside of the battery cell to the electrodes of each battery cell 10 is provided. It can be absorbed by 300 and released to the outside.

  According to the heat radiating component of the secondary battery 10 according to the present embodiment described above, the heat inside the container of the secondary battery 10 is transmitted to the electrode, and the heat radiating component provided on the electrode radiates heat to the outside of the secondary battery 10. By doing so, the heat inside the secondary battery 10 can be effectively dissipated.

  In addition, this invention is not limited to said embodiment, For example, it is good also as using said connecting washer 100 and the connection board 300 provided with the heat radiating fin simultaneously, In addition, it is normal. Of course, various changes, modifications, and substitutions can be made by those skilled in the art.

It is a block diagram of the secondary battery (unit cell) which concerns on this embodiment. It is the figure which showed the structural example of the washer. It is the figure which showed the example of attachment of a washer. It is a figure which shows an example of the assembled battery connected using the washer. It is the figure which showed the structural example of the nut. It is the figure which showed an example of the nut fixing tool. It is the figure which showed the structural example of the connection board. It is a figure which shows an example of the assembled battery connected using the connection board.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Secondary battery (single cell), 20 Battery container, 20A Top cover, 30 Electrode (polar pole), 30A Positive electrode (positive pole), 30B Negative electrode (negative pole), 40 electrode group, 50A Positive electrode collector 50B Negative electrode current collector, 100 washer, 102 holes, 104 fixing part, 106 heat radiation fin, 110 nut, 120 connecting plate, 200 nut, 202 hole, 202A female screw, 204 insertion hole, 206 heat radiation fin, 210 nut fixing tool, 212 tip portion, 300 connecting plate, 302 hole, 304 heat radiation fin, 400 assembled battery, 500 assembled battery.

Claims (4)

An electrode sheet, and the electrolyte, a current collector connected to said electrode sheet has a thermal conductivity, a container matches, provided on at least one surface of the container is the electrode connected to the collector among the plurality of secondary batteries comprising a pole, respectively, it is used to connect components for connecting the first secondary battery pole column and the other secondary battery pole pillar, when fixing with nut A washer ,
A hole provided in a bottom portion of the washer, through which the pole of the secondary battery of 1 passes,
A fixing portion that is provided on an outer periphery of the hole on the bottom portion and that accommodates and fixes the nut attached to a pole column penetrating the hole;
A radiating fin provided in an annular shape over the entire circumference of the outer side of the fixed part on the bottom part;
Washer, characterized in that it comprises a. A container containing an electrode sheet, an electrolytic solution, and a current collector having thermal conductivity and connected to the electrode sheet; and an electrode provided on at least one surface of the container and connected to the current collector A plurality of secondary batteries each including a pole column, wherein a connecting component that connects a pole column of one secondary battery and a pole column of another secondary battery is used as the pole column of the secondary battery A nut used for fixing,
A hole through which the pole column of the secondary battery of 1 passes, wherein a female screw is cut from the bottom surface to the top surface;
Two insertion holes provided on the upper surface of the nut body outside the hole, into which an instrument for rotating the nut is inserted;
A heat dissipating fin provided in an annular shape over the entire outer periphery of the main body of the nut;
A nut characterized by comprising . A container containing an electrode sheet, an electrolytic solution, and a current collector having thermal conductivity and connected to the electrode sheet; and an electrode provided on at least one surface of the container and connected to the current collector A plurality of secondary batteries each including a pole column, a connecting component that connects a pole column of one secondary battery and a pole column of another secondary battery,
A metal plate formed of a conductive material;
A first hole provided in the metal plate and through which the pole of the first secondary battery penetrates;
A second hole provided in the metal plate, through which the pole of the other secondary battery passes,
A radiating fin provided between the first hole and the second hole on the metal plate;
A connection component comprising: Washer according to claim 1, characterized in that the insulating coating of the surface of the washer.

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