WO2015173999A1 - Bloc-batterie et dispositif électronique - Google Patents

Bloc-batterie et dispositif électronique Download PDF

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Publication number
WO2015173999A1
WO2015173999A1 PCT/JP2015/001322 JP2015001322W WO2015173999A1 WO 2015173999 A1 WO2015173999 A1 WO 2015173999A1 JP 2015001322 W JP2015001322 W JP 2015001322W WO 2015173999 A1 WO2015173999 A1 WO 2015173999A1
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WO
WIPO (PCT)
Prior art keywords
heat
battery
battery pack
generating component
sheet
Prior art date
Application number
PCT/JP2015/001322
Other languages
English (en)
Japanese (ja)
Inventor
濱田　拓哉
忠行 久門
英則 津田
Original Assignee
三洋電機株式会社
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Filing date
Publication date
Application filed by 三洋電機株式会社 filed Critical 三洋電機株式会社
Publication of WO2015173999A1 publication Critical patent/WO2015173999A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/617—Types of temperature control for achieving uniformity or desired distribution of temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/623—Portable devices, e.g. mobile telephones, cameras or pacemakers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
    • H01M10/647—Prismatic or flat cells, e.g. pouch cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6554—Rods or plates
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/66—Heat-exchange relationships between the cells and other systems, e.g. central heating systems or fuel cells
    • H01M10/667—Heat-exchange relationships between the cells and other systems, e.g. central heating systems or fuel cells the system being an electronic component, e.g. a CPU, an inverter or a capacitor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/211—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for pouch cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to a battery pack that efficiently dissipates heat energy of a heat-generating component built in an electronic device, and an electronic device that incorporates the battery pack, and more particularly to a mobile phone, a smartphone, a tablet, an electronic book, a notebook computer, etc.
  • the present invention relates to a battery pack and an electronic device that are most suitable for portable electronic devices.
  • An electronic device incorporating a battery as a power source incorporates semiconductor elements such as a central processing unit (CPU), a field effect transistor (FET), a transistor, and a diode. These semiconductor elements are energized during operation and generate heat due to Joule heat. Since the semiconductor element does not operate normally when the temperature becomes higher than the set value, the semiconductor element radiates heat so as not to become higher than the set temperature.
  • semiconductor elements in recent years have a built-in CPU with almost no exception. However, this CPU requires a large amount of heat dissipation as its power consumption increases and the amount of heat generated increases as high-speed data is processed.
  • Patent Documents 1 and 2 In order to eliminate these disadvantages, devices having a structure that conducts heat energy to a battery built in an electronic device have been developed. (See Patent Documents 1 and 2)
  • the present invention has been developed for the purpose of solving the above disadvantages of conventional electronic devices.
  • An important object of the present invention is to provide a battery pack and an electronic device which can minimize the deterioration of the battery due to the temperature increase while uniformly conducting the heat energy of the heat generating component to the thin battery to reduce the temperature increase of the heat generating component. And to provide.
  • the battery pack of the present invention includes a thin battery 1 that is built in an electronic device having a heat generating component 3 and supplies electric power, and a heat radiating sheet 2 that is in a thermal contact state and in a surface contact state with the flat surface 1A of the thin battery 1. Is provided.
  • the heat dissipating sheet 2 includes a battery bonding portion 2A that is in a surface contact state with a predetermined area on the flat surface 1A, and a protruding portion 2B that protrudes from the outer periphery of the thin battery 1.
  • the protruding portion 2B has a component bonding portion 2C that is in a thermal contact state with the heat generating component 3 and is in a surface contact state, and conducts heat energy of the heat generating component 3 to the thin battery 1 through the heat radiating sheet 2.
  • the battery pack of the present invention can be provided with an opening 4 in the battery bonding portion 2A that exposes a part of the flat surface 1A and increases the distance of heat conduction from the heat generating component 3 to the thin battery 1.
  • the opening 4 can be arranged unevenly on the protruding portion 2B side in the heat conduction direction of heat energy conducted from the heat generating component 3 to the battery bonding portion 2A.
  • the opening position (W1) in the width direction of the opening 4 and the position (W2) in the width direction of the component bonding section 2C are the battery bonding section 2A and the protruding section 2B. It is possible to dispose at least a part of each of the both sides of the boundary line at a position facing each other.
  • the width direction opening position (W1) of the opening 4 and the width direction position (W2) of the component bonding portion 2C are heat conduction of heat energy transferred from the heat generating component 3 to the battery bonding portion 2A. It is the position in the width direction orthogonal to the direction (indicated by arrow C in the figure).
  • the area of the opening 4 can be 10% or more and 70% or less of the flat surface 1A.
  • the heat dissipation sheet 2 can have a thermal conductivity in the surface direction larger than the thermal conductivity in the thickness direction.
  • the heat radiating sheet 2 can be a graphite sheet, or a metal sheet made of aluminum or copper.
  • the electronic device in which the battery pack is incorporated is any one of a mobile phone, a smartphone, a tablet, an electronic book, and a notebook computer, and the heat generating component 3 can be a CPU.
  • the thin battery 1 can be either a rectangular battery having a metal outer can as an outer case or a laminate battery having a laminate film as an outer case.
  • the heat generating component 3 can be a semiconductor element.
  • the electronic device of the present invention includes a heat generating component 3, a thin battery 1 for supplying electric power, and a heat radiating sheet 2 that is in thermal contact with the flat surface 1A of the thin battery 1 and in surface contact.
  • the heat dissipating sheet 2 includes a battery bonding portion 2A that is in a surface contact state with a predetermined area on the flat surface 1A, and a protruding portion 2B that protrudes from the outer periphery of the thin battery 1.
  • the protruding portion 2B has a component bonding portion 2C that is in a thermal contact state with the heat generating component 3 and is in a surface contact state, and conducts heat energy of the heat generating component 3 to the thin battery 1 through the heat radiating sheet 2.
  • the electronic device of the present invention can be provided with an opening 4 that exposes a part of the flat surface 1A and increases the distance of heat conduction from the heat generating component 3 to the thin battery 1 in the battery bonding portion 2A.
  • the heat radiating sheet 2 has one surface in a surface-bonded state with the thin battery 1 and the other surface in a heat-bonded state on the inner surface of the outer case of the electronic device.
  • the thermal energy is thermally conducted to the thin battery 1 along the surface of the heat radiating sheet 2, and the heat energy thermally conducted to the surface of the heat radiating sheet 2 can be radiated to the outside through the exterior case.
  • the electronic device of the present invention is a mobile device such as a mobile phone, a smartphone, a tablet, an electronic book, or a notebook computer, and the heat generating component 3 can be a CPU.
  • the battery pack and the electronic device of the present invention are characterized in that the temperature rise of the heat generating component can be reduced by uniformly conducting the heat energy of the heat generating component to the thin battery, and the deterioration of the thin battery due to the temperature increase can be minimized. There is.
  • the above battery pack and electronic device make the heat-dissipating sheet come into surface contact with the flat surface of the thin battery with a predetermined area, and a protrusion is provided on the heat-dissipating sheet, and the heat-generating component is fixed to the protrusion in a thermally coupled state. Because it is.
  • This battery pack conducts heat by diffusing the heat energy of the heat generating component over a wide area on the flat surface of the thin battery through the heat dissipation sheet.
  • the thin battery has a structure in which positive and negative electrode plates are densely stacked inside the outer case, so the heat capacity of the unit area is larger than that of the plastic outer case, and it efficiently absorbs the heat energy of the heat-generating component to raise the temperature of the heat-generating component Make it smaller.
  • the thin battery absorbs the heat energy of the heat-generating component and rises in temperature, but does not conduct heat to the local part of the cylindrical battery as in the conventional electronic device. Thermal energy is diffused and conducted on the flat surface of the thin battery. For this reason, there is no local temperature rise of the thin battery, and heat energy is absorbed in a state where the temperature of the flat surface of a large area is made more uniform. For this reason, the thin battery can limit the temperature rise to a minimum while absorbing a large amount of heat energy, and can prevent deterioration due to the temperature rise.
  • the electronic device shown in the cross-sectional view of FIG. 1 includes a battery pack including a thin battery 1 and a heat dissipation sheet 2 for supplying power to a power supply circuit inside a plastic outer case 5.
  • the electronic device is a mobile device such as a mobile phone, a smartphone, a tablet, an electronic book, or a notebook computer.
  • the electronic device is not limited to a portable device such as a mobile phone or a smartphone, but may be another portable device, a game machine or a Walkman (registered trademark) with a built-in thin battery, or the like.
  • the heat generating component 3 is a central processing unit (CPU).
  • CPU central processing unit
  • the present invention does not specify the heat generating component 3 as a CPU, but can be other semiconductor elements such as a field effect transistor (FET), a transistor, and a diode, and can also be a resistor.
  • FET field effect transistor
  • the heat generating component 3 generates heat by the Joule heat of the flowing current. Accordingly, the amount of heat generated by the heat generating component 3 increases in proportion to the product of the square of the flowing current and the electric resistance, and varies depending on the flowing current.
  • FIG. 2 shows a battery pack.
  • the battery pack in FIG. 2 is in a thermal contact state and a surface contact state with a thin battery 1 for supplying power to a power circuit of an electronic device and a flat surface 1A of the thin battery 1.
  • a heat dissipation sheet 2 is provided.
  • the thin battery 1 is either a rectangular battery having a metal outer can as an outer case or a laminate battery having a laminated film as an outer case, and has a flat surface 1A that is a wide flat surface provided on both sides. .
  • positive and negative electrode plates (not shown) are laminated and sealed between the opposing flat surfaces 1 ⁇ / b> A in a posture parallel to the flat surface 1 ⁇ / b> A.
  • the thin battery 1 has a wider width and length of the flat surface 1A than the thickness, and the heat radiation sheet 2 can be bonded to the flat surface 1A so that the heat radiation sheet 2 can be fixed in a heat-bonded state over a wide area.
  • the heat radiating sheet 2 is a sheet having excellent heat conduction, and is a metal sheet obtained by thinly rolling a graphite sheet, a metal such as aluminum or copper. Since the graphite sheet has extremely excellent heat conduction characteristics (700 to 1950 W / m ⁇ K), the heat energy of the heat generating component 3 is efficiently conducted to the flat surface 1 A of the thin battery 1. In addition, the graphite sheet is extremely superior in heat conduction in the surface direction compared to heat conduction in the thickness direction, so that the heat energy of the heat generating component 3 is quickly conducted in the surface direction parallel to the surface. Conducted uniformly to the flat surface 1A of the thin battery 1.
  • the graphite sheet has a higher thermal conductivity than the aluminum outer case (about 230 W / m ⁇ K) of the thin battery 1, so that the graphite sheet can be applied to the entire surface of the graphite sheet more quickly than the heat conduction in the outer case of the thin battery 1.
  • the heat dissipating sheet 2 for example, a sheet having excellent heat conduction in the surface direction as compared with the thickness direction, such as a graphite sheet, is suitable. This is because the heat energy of the heat generating component 3 is promptly and uniformly conducted to the flat surface 1A of the thin battery 1.
  • This characteristic can be realized not only with a graphite sheet but also with heat-dissipating paper made by adding a heat conductive powder such as graphite to a fiber.
  • FIG. 2 has a heat dissipation sheet 2 laminated on almost the entire surface excluding the outer peripheral portion and the opening 4 of one flat surface 1A of the thin battery 1.
  • the heat-dissipating sheet 2 is preferably bonded and fixed to an area of 20% or more of one flat surface 1A.
  • the heat dissipation sheet 2 is bonded to the flat surface 1A of the thin battery 1 via an adhesive layer or an adhesive layer.
  • the heat-dissipating sheet 2 can be U-bent and bonded to the flat surfaces 1A on both sides of the thin battery 1.
  • the two heat dissipating sheets 2 can be bonded from the heat generating component 3 to the flat surfaces 1A on both sides of the thin battery 1.
  • the battery pack in which the heat-dissipating sheet 2 is bonded to the flat surfaces 1A on both sides of the thin battery 1 is characterized in that the entire thin battery 1 can be brought to a more uniform temperature. This is because the heat radiating sheet 2 is bonded to the flat surface 1A of the thin battery 1 with a large area, so that the heat energy can be conducted uniformly and efficiently throughout the thin battery 1.
  • the heat dissipation sheet 2 includes a battery bonding portion 2A that is bonded to the flat surface 1A of the thin battery 1 and a protruding portion 2B that protrudes from the outer periphery of the thin battery 1 to the outside.
  • the protruding portion 2B is provided with a component adhesion portion 2C that fixes the heat generating component 3 of the electronic device in a thermally coupled state and in a surface contact state.
  • the heat generating component 3 is bonded and fixed to the component bonding portion 2C of the heat radiating sheet 2 or is elastically pressed to be in a thermally coupled state and fixed in a surface contact state.
  • the battery bonding portion 2A is fixed in a state of surface contact with the flat surface 1A of the thin battery 1 in a thermally bonded state, and the component bonding portion 2C is also bonded to the surface of the heat generating component 3 in a surface contact state or is elastic. And is fixed in a close contact state.
  • the conductive heat radiation sheet 2 is fixed to the flat surface 1A of the thin battery 1 and the surface of the heat generating component 3 through an insulating layer.
  • a pressure-sensitive adhesive material or adhesive having excellent heat conduction characteristics is used for the pressure-sensitive adhesive layer or adhesive layer that adheres the heat radiation sheet 2 to the surface of the thin battery 1 and the heat-generating component 3.
  • the battery pack of FIG. 2 exposes a part of the flat surface 1A of the thin battery 1 to increase the distance of heat conduction from the heat generating component 3 to the thin battery 1 and to make the temperature distribution of the entire thin battery 1 uniform.
  • An opening 4 is provided. Since the opening 4 is provided in order to reduce the temperature difference of the flat surface 1A of the thin battery 1, the opening 4 is provided in a region where the temperature is highest including the radiant heat from the heat radiating component 3 in a state where the heat radiating sheet 2 is laminated. . That is, it is an area where the thin battery 1 and the heat dissipation component 3 are closest.
  • the heat dissipation sheet 2 bonded to the flat surface 1A of the thin battery 1 has a high temperature in a region close to the component bonding portion 2C.
  • the heat radiating sheet 2 shown in FIG. 2 has a heat conduction direction (indicated by an arrow C) of heat energy conducted from the heat generating component 3 to the battery bonding portion 2A.
  • the opening 4 is unevenly distributed on the protruding portion 2B side. This is because the heat energy is thermally conducted from the protruding portion 2B to the battery bonding portion 2A, so that the temperature of the battery bonding portion 2A of the heat radiation sheet 2 becomes higher on the protruding portion 2B side.
  • the heat radiating sheet 2 in FIG. 2 is provided with an opening 4 on the protruding portion 2B side with respect to the central portion (indicated by a one-dot chain line) in the heat conduction direction.
  • the heat radiation sheet 2 of FIG. 2 is configured such that the opening position (W1) in the width direction of the opening portion 4 and the position (W2) in the width direction of the component bonding portion 2C are partially or entirely, and the battery bonding portion 2A and the protruding portion. It arrange
  • the opening position (W1) in the width direction of the opening 4 is an opening position in the width direction orthogonal to the heat conduction direction of the heat energy conducted from the heat generating component 3 to the battery bonding portion 2A as indicated by an arrow C in FIG.
  • the position (W2) in the width direction of the component bonding portion 2C is a fixed position in the width direction orthogonal to the heat conduction direction of the heat energy indicated by the arrow C.
  • the dimension of the opening position (W1) in the width direction of the opening 4 is made larger than the dimension of the position (W2) in the width direction of the component bonding part 2C.
  • the width direction opening position (W1) can be made smaller than the width direction position (W2) or can be the same. 2 has an opening 4 so as to straddle both the battery bonding portion 2A and the protruding portion 2B.
  • the heat radiating sheet 2 partially changes the density of the openings 4 to make the temperature distribution of the thin battery 1 more uniform.
  • the opening 4 is enlarged in a region approaching the component bonding portion 2 ⁇ / b> C, and the opening 4 is reduced as the distance from the component bonding portion 2 ⁇ / b> C is increased.
  • the opening ratio of the unit area that opens the opening 4 gradually increases, and decreases as the distance from the component bonding portion 2C increases.
  • the temperature distribution on the flat surface 1A of the thin battery 1 is equalized.
  • the opening 4 so as to straddle both the battery bonding portion 2A and the protruding portion 2B.
  • the opening 4 can be provided only in the battery bonding portion 2A without being provided in the protruding portion 2B, or can be provided only in the protruding portion 2B.
  • the opening 4 provided in the component bonding part 2C is provided at a position approaching the boundary line with the battery bonding part 2A, that is, in the center of the boundary line in FIG. 2, so that the local temperature rise of the thin battery 1 is reduced. Restrict.
  • the change of the temperature of the flat surface 1A of the thin battery 1, the temperature of the heat generating component 3 as a heat source, and the capacity retention rate of the thin battery 1 was examined according to the shape of the heat dissipation sheet 2.
  • 4 to 6 are experimental examples in which the shape of the heat dissipation sheet 2 is changed.
  • the power consumption of the heat generating component 3 is 3 W
  • the heat radiating sheet 2 is a graphite sheet having a thickness of 17 ⁇ m
  • the flat surface 1A of the thin battery 1 is 90 mm ⁇ 55 mm in length ⁇ width
  • the heat radiating sheet 2 is used with a thickness of 4 mm, a width of the heat radiating sheet 2 of 53 mm, and a protruding amount of the protruding portion 2B of the heat radiating sheet 2 of 30 mm.
  • the thickness of the graphite sheet is 17 ⁇ m, but equivalent characteristics can be obtained if the thickness is 10 to 50 ⁇ m.
  • FIG. 7 to 9 show the temperature of the flat surface 1A of the thin battery 1, the temperature of the heat generating component 3 as a heat source, and the capacity retention rate of the thin battery 1 depending on the shape of the heat radiation sheet 2 of FIGS. It shows a state where and change.
  • the graph of FIG. 7 shows an area where the heat radiating sheet 2 without the opening 4 is bonded to the flat surface 1A of the thin battery 1, in other words, an area where the heat radiating sheet 2 is not bonded to the flat surface 1A ( FIG. 4 shows characteristics in which the temperature and the capacity retention ratio change when the hatching is changed).
  • FIG. 7 indicates an area where the heat radiation sheet 2 is not bonded on the flat surface 1A as an “area not attached to the battery” as an area ratio with respect to the flat surface 1A.
  • the graph of FIG. 8 shows that the heat radiation sheet 2 provided with the opening 4 is adhered to the entire flat surface 1A of the thin battery 1 and the flat surface 1A exposed by the opening 4 is exposed as shown in FIG.
  • FIG. 6 shows characteristics in which the temperature (capacity maintenance ratio) changes by changing the area (indicated by hatching in FIG. 5).
  • the graph of FIG. 9 shows that the heat radiation sheet 2 provided with the opening 4 is bonded to the region of 60% of the flat surface 1A of the thin battery 1 and the flat exposed by the opening 4 as shown in FIG. FIG.
  • FIG. 6 shows characteristics in which the area of the surface 1A (indicated by hatching in FIG. 6) is changed to change the temperature and capacity retention rate.
  • the horizontal axis of FIG. 8 and FIG. 9 shows the exposed area of the flat surface 1A exposed from the opening 4 as the “battery opening area” as an area ratio to the flat surface 1A.
  • the battery pack (FIG. 4) in which the heat-dissipating sheet 2 that does not have the opening 4 is bonded to the flat surface 1A on one side of the thin battery 1 and the area to be bonded to the flat surface 1A is changed.
  • the adhesion area to the flat surface 1A increases, in other words, as the unattached area on the battery decreases, the heat source temperature, that is, the temperature of the heat generating component 3 decreases, and the temperature difference of the flat surface 1A decreases.
  • the capacity maintenance rate after 800 cycles of the thin battery 1 is lowered.
  • the capacity maintenance rate after 800 cycles indicates the capacity maintenance rate for this battery based on the capacity maintenance rate after 800 cycles of the thin battery 1 in which the heat radiating sheet 2 is not bonded to the flat surface 1A.
  • Table 1 shows data of the graph shown in FIG.
  • the capacity until the thin battery 1 is discharged from full charge until reaching the discharge inhibition voltage is discharged and the time when the capacity is charged is defined as one cycle.
  • a curve A in FIG. 7 is an unattached area on the battery, which is a ratio of an area where the heat dissipation sheet 2 is not bonded to the flat surface 1A of the thin battery 1, that is, an area of a region where the battery bonding portion 2A is not bonded to the flat surface 1A.
  • the state in which the heat source temperature, that is, the temperature of the heat generating component 3 changes depending on the ratio is shown.
  • the surface temperature of the heat generating component 3 displayed as the heat source temperature falls to 40 ° C. to 78 ° C. depending on the unattached area on the battery.
  • the temperature of the heat generating component 3 is 40 ° C.
  • the battery pack in which the heat radiating sheet 2 is adhered to the entire flat surface 1A allows the thin battery 1 to absorb the heat energy of the heat generating component 3, and thus the cycle after 800 cycles of the thin battery 1
  • the capacity retention rate is reduced by 6 points to 78% compared to 84% in the state where the heat radiation sheet 2 is not adhered.
  • the temperature rise in the region A near the component bonding portion 2C of the battery bonding portion 2A is 13 ° C.
  • the temperature increase in the corner region B of the thin battery 1 far from the component bonding portion 2C is about 6 ° C.
  • the temperature difference of the flat surface 1A becomes as large as 7 ° C.
  • the temperature indicated by A, B, C, and D in the column of battery temperature increase indicates the temperature increase of the battery in region A, region B, region C, and region D shown in FIG. .
  • the battery pack can be provided with an opening 4 in the heat dissipation sheet 2 to reduce the temperature difference of the flat surface 1 ⁇ / b> A.
  • FIGS. 8 shows temperature characteristics in which the heat radiating sheet 2 having the opening 4 is bonded to the entire flat surface 1A as shown in FIG.
  • FIG. 9 shows a temperature characteristic in which the heat radiating sheet 2 having the opening 4 is bonded to a region of 60% of the flat surface 1A as shown in FIG.
  • the battery pack having the characteristics shown in FIG. 8 is provided with an opening 4 in the battery bonding portion 2A of the heat dissipation sheet 2 as shown in FIG.
  • the heat radiating sheet 2 of FIG. 5 also has an opening 4 so as to straddle both the battery adhesive portion 2A and the protruding portion 2B.
  • the flat surface 1A is exposed in the region of the opening 4, and the battery bonding portion 2A is bonded to the flat surface 1A in the region where the opening 4 is not provided. Further, as shown in FIG.
  • the heat radiating sheet 2 is bonded to the flat surface 1A with a width of 10 mm on both sides of the opening 4, and in order to change the area of the opening 4, the direction away from the component bonding portion 2C ( In the state where the length in the heat conduction direction is changed and the opening 4 extends to the tip, the lateral width is widened on both sides to increase the hole opening area to 100%. ing.
  • Table 2 shows the data of the graph shown in FIG.
  • the temperatures indicated by A, B, C, and D indicate the battery temperature increase in regions A, B, C, and D shown in FIG. .
  • the hole area is changed from 20% to 80%, and the temperature difference of the flat surface 1A is 2.2 ° C. (20%). It becomes as small as 1 ° C. (40%), 1.6 ° C. (60%), and 1.9 ° C. (80%).
  • the thin battery 1 can minimize the temperature difference of the flat surface 1A with the opening 4 as an optimum value.
  • the opening 4 of the heat radiating sheet 2 is effective for reducing the temperature difference of the thin battery 1, but when the opening 4 is enlarged, the temperature of the heat generating component 3 increases. This is because the heat conduction area between the heat radiation sheet 2 and the flat surface 1A of the thin battery 1 is reduced, and the heat energy conducted from the heat generating component 3 to the thin battery 1 is reduced.
  • the hole area is 20% to 80%
  • the temperature of the heat generating component 3 displayed as the heat source temperature is 52.2 ° C. (20%), 70 as shown by the curve A. .9 ° C. (40%), 81.0 ° C. (60%), and 85.0 ° C. (80%).
  • the cycle capacity retention rate after 800 cycles of the thin battery 1 is increased as the opening 4 is increased and the hole opening area is increased as shown by the curve B, that is, the heat conduction energy to the thin battery 1 is increased.
  • the capacity retention rate is close to 84% of the state in which the heat radiating sheet 2 is not adhered, that is, the deterioration becomes smaller.
  • FIG. 9 shows the temperature characteristics and capacity retention rate of the battery pack in which the heat-dissipating sheet 2 having the opening 4 is bonded to the 60% region of the flat surface 1A as shown in FIG.
  • the heat radiation sheet 2 in FIG. 6 also has an opening 4 so as to straddle both the battery bonding portion 2A and the protruding portion 2B.
  • the heat radiating sheet 2 is not adhered to the 40% region of the flat surface 1A, and the flat surface 1A is exposed at the opening 4 in the remaining 60% region.
  • the battery bonding portion 2A is bonded to the region of 60% of the flat surface 1A. Further, as shown in FIG.
  • the heat radiating sheet 2 is bonded to the flat surface 1 ⁇ / b> A with a width of 10 mm on both sides of the opening 4, and in order to change the area of the opening 4, the direction away from the component bonding portion 2 ⁇ / b> C ( In the state where the length in the heat conduction direction is changed and the opening 4 extends to the tip, the lateral width is widened on both sides and the hole area is increased to 60%. .
  • Table 3 shows the data of the graph shown in FIG.
  • the temperatures indicated by A, B, C, and D indicate the battery temperature increase in regions A, B, C, and D shown in FIG. .
  • the battery pack shown in FIG. 6 has a hole area changed from 10% to 40%, and the temperature difference of the flat surface 1A is 5.0 ° C. (10%). 9 ° C. (20%) and 2.9 ° C. (40%). Further, in this battery pack, the hole area is 10% to 40%, and the temperature of the heat generating component 3 displayed as the heat source temperature can be lowered to 67.7 ° C. to 78.2 ° C. as indicated by the curve A.
  • the cycle capacity maintenance rate after 800 cycles of the thin battery 1 is as shown by the curve B, as the opening 4 is increased, that is, as the heat conduction energy to the thin battery 1 is reduced, It is close to 84% of the state in which the heat radiating sheet 2 is not adhered, that is, the deterioration is small.
  • FIG. 10 shows a state in which the heat energy of the heat generating component 3 is thermally conducted and radiated to the outside.
  • This figure shows the heat conduction state of the heat-dissipating sheet 2 that is superior in heat conduction in the surface direction as compared to the thickness direction, such as a graphite sheet.
  • the heat energy of the heat generating component 3 is more quickly conducted in the surface direction of the heat radiating sheet 2 indicated by the arrow A than in the direction indicated by the arrow B, and is conducted to the flat surface 1A of the thin battery 1.
  • the thermal energy that is quickly conducted in the surface direction indicated by the arrow A is uniformly diffused on the surface of the heat dissipation sheet 2 and is conducted uniformly over a wide area of the flat surface 1A of the thin battery 1.
  • the heat-dissipating sheet 2 having the heat conduction characteristic prevents the temperature of the portion where the heat generating component 3 is fixed from being locally abnormally high, reduces the temperature difference across the flat surface 1A of the thin battery 1 and generates heat.
  • the temperature difference between the component 3 and the thin battery 1 flat surface 1A is reduced. Therefore, as shown in the sectional view of FIG. 10, the heat generating component 3 and the thin battery 1 are fixed to the same surface of the heat radiating sheet 2, and the local rise in the temperature on the upper surface of the heat radiating sheet 2 can be reduced.
  • This is characterized in that a local temperature rise of the outer case 5 due to the heat radiating sheet 2 can be reduced while the heat radiating sheet 2 is in close contact with the inner surface of the outer case 5 to be in a thermally coupled state.
  • the heat dissipation sheet 2 conducts heat energy of the heat generating component 3 to the thin battery 1 and causes the thin battery 1 to absorb heat energy of the heat generating component 3.
  • the temperature of the thin battery 1 that has absorbed the heat energy rises, the absorbed heat energy is radiated to the outside over time to lower the temperature.
  • the heat generating component 3 generates heat due to Joule heat, the amount of heat generated varies depending on the current consumption. For example, in a CPU of an electronic device such as a mobile phone, if the amount of data processed by, for example, image processing increases, the consumption flow rate increases and the amount of heat generation temporarily increases.
  • the temperature of the heat generating component 3 rises, the heat energy is conducted to the thin battery 1 through the heat dissipation sheet 2.
  • the thin battery 1 absorbs the heat energy of the heat generating component 3 and reduces the temperature rise of the heat generating component 3.
  • the heat capacity of the thin battery 1 is larger than that of the plastic outer case 5. This is because the heat capacity per unit weight of the thin battery 1 is larger than that of plastic, and the thin battery 1 is hotter than the outer case 5. Therefore, the heat dissipation structure in which the heat energy of the heat generating component 3 is conducted to the heat radiating sheet 2 and absorbed by the thin battery 1 is compared with the heat dissipation structure in which the heat energy of the heat generating component 3 is thermally conducted to the exterior case 5. The temperature rise of 3 can be reduced. The thin battery 1 absorbs the heat energy of the heat generating component 3 and rises in temperature.
  • the thin battery 1 whose temperature has risen radiates the heat energy absorbed through the heat radiating sheet 2 bonded to the flat surface 1A from the outer case 5 to the outside. In this state, the thin battery 1 has a small temperature difference, and the heat is uniformly radiated from the outer case 5 to the outside through the heat radiating sheet 2 bonded to the flat surface 1A.
  • the battery pack that absorbs the heat energy of the heat-generating component 3 such as the CPU through the heat-dissipating sheet 2 by heat conduction to the thin battery 1 is absorbed by the thin battery 1 and the heat-generating component 3 rapidly
  • the temperature rise can be reduced, and the thermal energy absorbed by the thin battery 1 can be radiated from the outer case 5 to the outside over time, so that the average temperature rise of the thin battery 1 can be reduced.
  • the thin battery 1 temporarily absorbs the heat energy of the heat generating component 3, that is, the thin battery 1 acts as a buffer that temporarily absorbs the heat energy, thereby causing the temperature of the heat generating component 3 to increase rapidly. Make it smaller.
  • the electronic device shown in the cross-sectional view of FIG. 1 has one surface (the lower surface in the figure) of the heat dissipation sheet 2 bonded to the thin battery 1 and the other surface (the upper surface in the figure) on the inner surface of the exterior case 5 of the electronic device. Arranged in a thermally coupled state.
  • the heat energy of the heat generating component 3 is thermally conducted to the thin battery 1 along the surface of the heat dissipation sheet 2 and absorbed by the thin battery 1.
  • the thermal energy absorbed by the thin battery 1 is radiated from the outer case 5 to the outside via the heat radiating sheet 2 and the outer case 5.
  • the heat dissipation sheet 2 can conduct heat energy of the heat generating component 3 to a plurality of thin batteries 1.
  • the battery pack of this figure two thin batteries 1 are arranged close to each other, and a heat dissipation sheet 2 is bonded to the flat surface 1A of both thin batteries 1. Since this battery pack conducts the heat energy of the heat generating component 3 to the two thin batteries 1, it has a feature that the temperature rise of the heat generating component 3 can be further reduced.
  • the heat radiation sheet 2 can be bonded to the flat surface 1A of three or more thin batteries 1 to conduct heat energy of the heat generating component 3 to each thin battery 1.
  • the heat-dissipating sheet 2 is bonded to the flat surfaces 1A of the plurality of thin batteries 1 and the heat generating component 3 is fixed to a position other than the boundary portion of the thin batteries 1 so that the heat energy of the heat generating components 3 is changed.
  • the thin battery 1 can be thermally conducted. This structure can reduce the temperature difference by providing the opening 4 in the battery adhesive portion 2A.
  • the battery pack and electronic device of the present invention can be conveniently used for devices that are important to use while reducing the temperature rise of the heat generating component 3 such as a built-in CPU.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biophysics (AREA)
  • Secondary Cells (AREA)
  • Battery Mounting, Suspending (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

La présente invention concerne un bloc-batterie comprenant une feuille de dissipation de chaleur (2) qui est thermiquement couplée à une surface plate (1A), et en contact de surface avec cette dernière, d'une batterie à profil bas intégrée (1). La feuille de dissipation de chaleur (2) comprend : une partie (2A) d'adhérence à la batterie qui est en contact de surface avec la surface plate (1A) ; et une partie en saillie (2B) qui fait saillie de la circonférence extérieure de la batterie à profil bas (1). La partie en saillie (2B) comprend, sur sa surface, une partie (2C) d'adhérence à un composant qui est thermiquement couplée à un composant émettant de la chaleur (3) et en contact de surface avec ce dernier, et la partie en saillie conduit l'énergie thermique du composant émettant de la chaleur (3), qui est fixé à la partie (2C) d'adhérence au composant, à la batterie à profil bas (1) par le biais de la feuille de dissipation de chaleur (2). Grâce à cette configuration, tandis que l'on maintient à un faible niveau une augmentation de température du composant émettant de la chaleur par conduction uniforme de l'énergie thermique du composant émettant de la chaleur vers la batterie à profil bas, on peut réduire à un minimum la détérioration de la batterie provoquée par l'augmentation de température.
PCT/JP2015/001322 2014-05-14 2015-03-11 Bloc-batterie et dispositif électronique WO2015173999A1 (fr)

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JP2014100699A JP2017123212A (ja) 2014-05-14 2014-05-14 電池パックおよび電子機器

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JP2018181519A (ja) * 2017-04-07 2018-11-15 トヨタ自動車株式会社 非水電解質二次電池
CN109698292A (zh) * 2017-10-20 2019-04-30 北京小米移动软件有限公司 电源、电子设备
WO2019139098A1 (fr) * 2018-01-10 2019-07-18 藤森工業株式会社 Bloc-batterie et dispositif moteur alimenté électriquement
CN114256553A (zh) * 2019-01-09 2022-03-29 比亚迪股份有限公司 无模组框架的电池包、车辆和储能装置

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JP6982460B2 (ja) * 2017-10-16 2021-12-17 三洋化成工業株式会社 リチウムイオン電池
KR102549437B1 (ko) * 2018-11-30 2023-06-28 주식회사 엘지에너지솔루션 전극 조립체 및 이를 포함하는 이차 전지
KR102442035B1 (ko) * 2018-11-30 2022-09-07 주식회사 엘지에너지솔루션 이차 전지 및 이를 포함하는 디바이스
WO2021171404A1 (fr) * 2020-02-26 2021-09-02 三菱電機株式会社 Réfrigérateur
JP2021190383A (ja) * 2020-06-03 2021-12-13 積水化学工業株式会社 耐火シート及びバッテリー

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JP2000323186A (ja) * 1999-05-07 2000-11-24 Sanyo Electric Co Ltd 電子機器のバッテリー装置
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Publication number Priority date Publication date Assignee Title
JP2018181519A (ja) * 2017-04-07 2018-11-15 トヨタ自動車株式会社 非水電解質二次電池
CN109698292A (zh) * 2017-10-20 2019-04-30 北京小米移动软件有限公司 电源、电子设备
CN109698292B (zh) * 2017-10-20 2021-08-17 北京小米移动软件有限公司 电源、电子设备
WO2019139098A1 (fr) * 2018-01-10 2019-07-18 藤森工業株式会社 Bloc-batterie et dispositif moteur alimenté électriquement
JPWO2019139098A1 (ja) * 2018-01-10 2020-12-24 藤森工業株式会社 組電池および電動装置
JP7242560B2 (ja) 2018-01-10 2023-03-20 藤森工業株式会社 組電池および電動装置
CN114256553A (zh) * 2019-01-09 2022-03-29 比亚迪股份有限公司 无模组框架的电池包、车辆和储能装置
CN114256553B (zh) * 2019-01-09 2023-12-12 比亚迪股份有限公司 无模组框架的电池包、车辆和储能装置
US11955651B2 (en) 2019-01-09 2024-04-09 Byd Company Limited Power battery pack and electric vehicle

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